Dongguan Dongjiang Water Co., Ltd. urban sewage treatment plant (including urban fecal harmless treatment station)
Located in the southern city of Shigu Village Wang Zhou, covers an area of 162,100 square meters, the daily sewage treatment capacity of 200,000 tons of sewage, 150 tons of fecal matter emptied, Dongguan City, the city's current use of secondary treatment of the largest one of the living It is the largest domestic sewage treatment plant in Dongguan City with secondary treatment and the only station for harmless treatment of feces. The plant has two sewage pumping stations, Xinji sewage pumping station and Shanzhou River sewage pumping station, which are under the jurisdiction of the plant. It is a wholly-owned state-owned enterprise. The scope of sewage and feces collection: all of Guancheng District, Nancheng District and Dongcheng District, the domestic sewage of the southern cluster of Wanjiang District and the emptied feces of these four districts. Service area of 62.95 square kilometers, service area of the current population of 499,600 people.
The estimated total investment in the plant is 600 million yuan, of which 200 million yuan of investment in the plant, pipe network investment of 400 million yuan. Plant, pipeline network, all invested by the Dongguan Municipal Finance, built in two phases, one of which started in September 2001, put into trial operation in June 2002, using anaerobic - oxidation ditch process (A/O process), the capacity of 100,000 tons / day; the second phase of the construction started in September 2003, put into trial operation on August 28, 2004, the use of anoxic, anaerobic - oxidation ditch process (A2/O process). -The second phase was put into trial operation on August 28, 2004, adopting anoxic, anaerobic oxidation ditch process (A2/O process) with a treatment capacity of 100,000 tons/day. The total length of the main interceptor pipe is 14.77Km, and the pipe diameter is from D1400mm to D2600mm; the total length of the branch pipe is 4.9Km, and the pipe diameter is from D300mm to D1600mm.
The plant's treated sewage, sampling and testing by the Municipal Environmental Protection Monitoring Station, in line with the comprehensive discharge of sewage at the national level (GB18918-2002) B standards and Guangdong Province (DB4426 - 2001) a standard.
Legal representative/responsible person: Wang Jianwei
Telephone number (fax): 2982617
Postal code: 523000
Enterprise address: Nancheng District, Shigu Village, Wangzhou
Corporate establishment: 2002-12-31
Guangzhou City, Datansha Wastewater Treatment Plant
Water Treatment Plant p>Guangzhou Datansha Sewage Treatment Plant for the city's first large-scale urban sewage treatment plant, the treatment scale of 150,000 m3 / d, covering an area of 14 ha, with a total investment of 140 million yuan, the service area of 1,289 ha, serving a population of about 600,000 people. The project is jointly designed by Guangzhou Municipal Engineering Design and Research Institute and China Municipal Engineering North China Design and Research Institute. It won the first prize of Guangzhou environmental protection research and design, the second prize of excellent design of Guangdong Province and the third prize of excellent design of the Ministry of Construction of China.
The sewage treatment process adopts the biological phosphorus removal and nitrogen removal activated sludge method (referred to as A2/O), which was fully completed and put into operation at the end of November 1989, and after years of operation, it has been proved that the treated effluent fully meets the design requirements, so that the water quality of the Zhujiang River near the plant has significantly improved, and significant social and environmental benefits have been achieved.
Projects include: (1) sewage pumping station, Ao Hau pumping station sewage pumping station is equipped with six pumps (5 with 1 spare), total pumping capacity of 96,000 m3 / d, the team of Chung area sewage pumping to the Datansha sewage treatment plant treatment; Liwan pumping station is equipped with four pumps (3 with 1 spare), a total of 576,000 m3 / d pumping capacity of the sewage pumped to the Datansha sewage treatment plant treatment of the sewage of the Liwan Chung. (2) The sewage treatment plant is located in Guangzhou. (2) sewage treatment plant is located in the western suburbs of Guangzhou City, Datansha island, covers an area of 200 acres, Liwan pumping station and Aokou pumping station pumping sewage through the pressure pipe across the river to the plant.
The sewage treatment in the plant is divided into primary treatment and secondary treatment. Primary treatment consists of sand sedimentation tank and primary sedimentation tank to remove larger particles of organic matter; secondary treatment adopts biological phosphorus removal and denitrification activated sludge method, which consists of biological reaction tank, secondary sedimentation tank and contact disinfection tank, and achieves the purpose of removing the organic matter and nitrogen and phosphorus in sewage through biochemical action of different kinds of microorganisms in the anaerobic, anoxic and aerobic environments. The sludge treatment plant area is reserved for sludge digestion, but taking into account the characteristics of Guangzhou city sewage with low content of organic matter, the design adopts the process of direct dewatering of raw sludge, which consists of sludge thickening tanks, sludge storage tanks and sludge dewatering machine room, which can thicken and mechanically dewater the sludge produced in the process of sewage treatment, so as to reduce the water content of the sludge from about 98% to 75% to 80%, and then become the dry sludge cake after It can be transported to sanitary landfill and disposed of together with garbage in sanitary landfill.
Project features: (1) According to the Pearl River, Guangzhou section of the West Channel (near the Xicun water plant) water quality in nitrogen and phosphorus pollution is serious, the first time in the country to choose the international advanced phosphorus de-nitrogenation process. (2) The design of advanced equipment at home and abroad, such as microporous aerators, submersible pumps, underwater mixers and sludge dewatering machines to reduce energy consumption. (3) Constructing a large pool body in the complex cave limestone area, there is no leakage and cracks after completion. (4) The degree of automation is high, the equipment is controlled according to the program, recorded and controlled by the central control room through the computer, and the monitoring includes pH, SS, MLSS, temperature, mud level, dissolved oxygen, oxidation reduction potential and so on. (5) The general layout of the treatment plant is reasonable and compact, with a high degree of greening and elegant environment, which is highly praised by domestic and foreign counterparts.
Area code: 020
Telephone: 020-81754527
Address: Shuangqiao Road, Tanwei Street
Guangzhou Xilang Wastewater Treatment Co.
Xilang Wastewater Treatment Plant (Phase I) occupies an area of 113,033m2, with a floor area of 17,058m2, and is designed to have a capacity of 200,000m3/d. It adopts the modified A2O process, with good function of dephosphorization and nitrogen removal. When the project is put into operation, it will effectively collect and treat all the sewage of Fangcun District and part of the sewage of Haizhu District, improve the water body of Guangzhou section of the Pearl River, protect the water quality of the water intake points of Xicun Water Plant, Shimen Water Plant, Xiaozhou Water Plant and Shixi Water Plant of Guangzhou, optimize the investment environment, thus improve the quality of life of the people of Guangzhou, and produce good environmental benefits, social benefits and economic benefits.
Guangzhou Lijiao Sewage Treatment Plant
The plant was constructed in phases, the first phase of the project in 1991, officially put into operation in 1999, designed to handle 220,000 tons per day; the second phase of the project started in April 2002, the trial water operation in October 2003, the design capacity of 220,000 tons per day; Hunter three started in 2004, September 2006 Hunt Phase III commenced construction in 2004 and was commissioned on September 26, 2006, with a design capacity of 200,000 tons per day. The first phase of the plant adopts AB two-stage adsorption and degradation biological treatment process, the second phase adopts combined alternating activated sludge treatment process, and the third phase adopts improved A2/O process (anoxic/anaerobic/aerobic activated sludge method). Outside the plant*** there are 4 sewage lifting pumping stations in Donghaochong, Xihaochong, Tianhe South Road and Linhe East Road, of which Donghaochong pumping station also undertakes the task of flood control and drainage in the central city. The main structures in the plant include: lifting pumping station, sand sedimentation tank, biological reaction tank, secondary sedimentation tank, thickening tank, dewatering machine room, contact tank and so on. After the sewage is transported to the plant from the pumping station outside the plant, it goes through the coarse and fine grating in the lifting pump room of the plant to remove the larger suspended and floating matters in the sewage; then it is lifted by the centrifugal submersible pump and enters into the elevated drainage tank of the plant to flow into the sand sedimentation tank; the sewage treated by sand sedimentation enters into the first and second phase of the bioreactor for treatment, and then goes through the second sedimentation and disinfection to meet the standard of discharge.
At present, the plant has established a "quality, environment, occupational health and safety" trinity of scientific management system, standardize the production and safety and other aspects of work, to ensure that the completion of the task of the amount of treated water and the quality of water discharged to meet the standards of stability. Since the commissioning of Hunde Sewage Treatment Plant, the water quality of the Guangzhou section of the Pearl River has been significantly improved. As of December 5, 2006 statistics show that this year, Hunter plant one and two phases of sewage treatment has reached a total of 165.12 million tons, 25 days ahead of schedule to successfully complete the annual 164.477 million tons of production tasks, treatment of effluent all meet or better than the national level B standards.
Guangzhou Hounde Sewage Treatment Plant
Guangzhou Hounde Sewage Treatment Plant is the second large-scale modernized urban sewage treatment plant in the sewage treatment planning of Guangzhou, located in Tianhe District, Guangzhou City, east of Hounde Village, the north bank of the Pearl River at the South China Bridge, covers an area of 390,000 square meters, is mainly responsible for the collection and treatment of most of the city center area north of the Pearl River's former navigation channel, including Xihaochong, the riverine self-expulsion system, Donghaochong, Ersha Island and part of the sewage in Tianhe District, with a service area of 150 square kilometers and a service population of about 2.15 million.
Plant construction in phases, the first phase of the project in 1991, officially put into operation in 1999, designed to handle 220,000 tons per day; the second phase of the project started in April 2002, October 2003 trial water operation, designed to handle 220,000 tons per day; Hunter three started in 2004, September 26, 2006 to achieve the water trial operation, designed to handle 200,000 tons per day. The design capacity is 200,000 tons per day. Phase I of the plant adopts the AB two-stage adsorption and degradation biological treatment process, Phase II adopts the combined alternating activated sludge treatment process, and Phase III adopts the modified A2/O process (anoxic/anaerobic/aerobic activated sludge process). Outside the plant*** there are 4 sewage lifting pumping stations in Donghaochong, Xihaochong, Tianhe South Road and Linhe East Road, of which Donghaochong pumping station also undertakes the task of flood control and drainage in the central city. The main structures in the plant include: lifting pumping station, sand sedimentation tank, biological reaction tank, secondary sedimentation tank, thickening tank, dewatering machine room, contact tank and so on. After the sewage is transported to the plant from the pumping station outside the plant, it goes through the coarse and fine grating in the lifting pump room of the plant to remove the larger suspended and floating matters in the sewage; then it is lifted by the centrifugal submersible pump and enters into the elevated drainage tank of the plant to flow into the sand sedimentation tank; the sewage treated by sand sedimentation enters into the first and second phase of the bioreactor for treatment, and then goes through the second sedimentation and disinfection to meet the standard of discharge.
Company Legal Person: Zhou Manqi Number of Employees: 150 Contact Address: No. 501, Linjiang Avenue, Tianhe District, Guangzhou City, Guangdong Province, China Zip Code: 510655 Tel: 020-38890399 Company Fax: 38890803 Guangzhou Panyu District, the front of the Front Water Purification PlantThe Front Water purification plant is located in Panyu District, Shiji Town, Qianfeng Village, covering a total area of 300 acres, the planned sewage treatment scale of 40 tons / day, in four phases of construction, the first phase of 100,000 tons / day, the second phase of 100,000 tons / day, and the other reserved for the third and fourth phase of the construction of each of the 100,000 tons / day of treatment capacity of the construction site. The project was approved by the Guangzhou Municipal Planning Commission to establish the project, in March 2001 to start construction. A total estimated investment of 420 million, of which 200 million yuan of plant engineering (the use of national debt 0.82 billion yuan), supporting the interception of sewage projects 220 million yuan.
The plant project consists of plant lift pumping station, fine grating and sand sedimentation tank, combined alternating biological treatment tank (UNITANK reaction tank), contact disinfection tank, sludge storage sludge tanks, sewage thickening glue machine room, blower room, substation room, comprehensive office building and other components. Outside the plant interception project covers the city bridge center city, stone base and Sha Wan town center, the interception of sewage trunk pipe length of 52 kilometers, the interception of sewage gate 8, lift the pumping station 4.
The project introduces the UNITANK? patented technology of Belgium Siggs Company, and adopts the combined alternating A/O activated sludge treatment process, which has the function of phosphorus removal and ammonia nitrogen removal, and also disinfects the discharged sewage. The quality of effluent water carries out the national "comprehensive sewage discharge standards" and "Guangzhou sewage discharge standards" of the primary discharge standards, the main discharge indicators are (unit: mg/L): BOD5 ≤ 20, CODcr ≤ 60, SS ≤ 20, NH4-N ≤ 10.
The project design is carried out by the Guangzhou Municipal Design and Research Institute; the project supervision, equipment purchase and installation, civil construction The use of public bidding form of selected contractors, Hubei Province, Zhongnan Municipal Engineering Supervision Company won the bid responsible for civil construction and equipment installation supervision, Guangdong Province, four construction, Guangzhou City, four construction, Guangzhou Municipal Construction Group and other units to undertake civil engineering construction, Shenzhen Zhongxing new equipment communications company and China General Machinery Corporation, the total package of equipment procurement and installation and commissioning work. The main processing equipment and key technologies are introduced from abroad, and general equipment is manufactured domestically.
The project operation and management according to the socialization, market-oriented, professional mode, in the form of international public tender by selecting the operator, attracted the French Vivendi water companies and other domestic and foreign units to participate in the bidding, and finally by the Shenzhen Water (Group) Limited was awarded the tender responsible for the plant and pipeline network operation and maintenance work, the contract period of five years.
At present, the first phase of 100,000 tons / day capacity of civil construction and equipment installation works have been basically completed, will soon carry out equipment commissioning and test run. It is expected that after full operation in the second quarter of 2004, most of the domestic sewage in the central city of Shiqiao and the central area of Shiqi, Shilou and Shawan towns can be treated, and the quality of the environment in the area will be significantly improved.
Legal person: Liang Zhu
Main business: sewage purification
Tel: 84611726
Address: Qianfeng Village, Shiji Town, Panyu District, Guangzhou City, Guangdong Province
Economic type: State-owned enterprises
Production output: 3-5 million
Number of personnel: 22 people
Opening Year: 1999
Guangzhou Economic and Technological Development Zone Sewage Treatment Plant East District Plant
Guangzhou Economic and Technological Development Zone East District Sewage Treatment Plant (now renamed East District Water Purification Plant) project for the use of the Austrian government loan to build the project, the estimated total investment of 82 million yuan, the actual investment in the project is about 70 million yuan, of which 490 U.S. dollars using the loan from the Austrian government. The project broke ground in February 2002, completed and accepted in May 2003, had been awarded the title of Guangzhou City, safe and civilized construction model site.
I, the scope of services and water standards
East sewage treatment plant service area for the Guangzhou Economic and Technological Development Zone East, the service area *** counts 7 square kilometers. East District sewage treatment plant covers a small area, the site is located in the East District Hongguang Road south, west of the Nangang River on a triangular plot of land, covering a total area of about 35,000 square meters, the first phase of the project covers an area of 16,000 square meters.
Currently, the drainage system in the East District is a diversion system, where rainwater and sewage are discharged into separate systems. Sewage sources mainly include production wastewater discharged by electronics, food, steel, auto parts manufacturing enterprises in the area and domestic sewage discharged by residents in the living area. East sewage treatment plant design capacity of 90,000M3 / day, of which the first phase of the design capacity of 25,000M3 / day, the implementation of the national "Comprehensive Emission Standards for Sewage" (GB8978-1996) a level of emission standards. Designed influent and effluent water quality are:
Major pollutants Designed influent water quality Designed effluent water quality
BOD5 200 mg/l ≤20 mg/l
CODcr 400 mg/l ≤60 mg/l
SS 250 mg/l ≤20 mg/l
NH3-N 25 mg/l ≤15 mg/l
The design capacity of the first phase is 20,000M3/day, of which the design capacity of the first phase is 20,000M3/day, implementing the comprehensive sewage discharge standard (GB8978-1996). mg/l
PO43- 5 mg/l ≤0.5 mg/l
Second, the treatment process and flow
For the specific situation of the East District Wastewater Treatment Plant, according to the principle of "advanced technology, economic and reasonable, high efficiency and energy saving, simple and practical, and save land", it is determined that the treatment process of the East District Wastewater Treatment Plant is intermittent. Treatment plant treatment process for the intermittent activated sludge method.
The mechanism of intermittent activated sludge process is to change the traditional activated sludge process, in which different biological conditions are generated in different pools, so that the sewage completes its biochemical treatment stage in different spaces, into the same biological pool, by creating different biological environments at different times, so that the sewage completes its biochemical treatment process at different times in the same space.
Intermittent activated sludge method forms a cycle through four stages of water intake - aeration - sedimentation - skimming, the time is about 4~6 hours, the sewage in the repeated anaerobic, anoxic, aerobic environment to complete the dephosphorization and denitrogenation.
This process of biological pool for the aeration head aeration, can greatly improve the oxygen supply efficiency, and can increase the depth of the biological pool, reducing the footprint. At the same time, because the biological pool is completely mixed biological pool, you can eliminate the first sedimentation tank. Usually other processes in the second sedimentation tank, reflux pump room in this process is also eliminated, so its treatment process is greatly reduced.
Three, the main economic and technical indicators
Serial No. Item Unit Indicator
1 annual total cost of 1036.33
2 annual operating costs of 10,000 yuan 575.66
3 unit of production costs of yuan/m3 1.14
4 unit of operating costs of yuan/m3 0.63
5 annual electricity costs of 176.34 yuan. Electricity cost 176.34
6 Unit water consumption Kw.h/m3 0.19
7 Unit water investment 2800 yuan/m3
8 Total investment of the project 7000
9 of which: foreign loans of $4.9 million
10 Domestic supporting funds 2800 million yuan
Four, the characteristics of the project
1, the project is the first of its kind in the world, and it is the only one of its kind in the world. /p>
1, advanced equipment. East District sewage treatment plant is the use of the Austrian government loan construction project. The main equipment in the plant are selected through international bidding in the international famous brands and the most advanced models. Equipment suppliers include Siemens, ABB, Netzsch, Andritz, ProMinent, KSB, AGRE, Spirac, Heideco, Huber, Burbach, Technofluid, Nopol, E+H, COMPAQ, Hach, WTW, Sartorius, Zeiss and so on.
2. High degree of automation. The automatic control system adopts the most advanced profibus bus control, remote three-level control. Realize the inlet and outlet water turbidity, inlet and outlet water PH, dissolved oxygen, liquid level, flow rate and other online monitoring, equipped with inlet and outlet 24-hour automatic sampler. The central control room has chosen Wonderware InTouch 7.0, a 32-bit object-oriented graphical human-machine interface based on Microsoft Windows, and ACRON, a fully automatic recording system, which enables semi-automatic or full-automatic control of the production line through the human-machine interface, and process scheduling to ensure that the effluent water is properly controlled by modifying the settings of the process parameters in the computer. Process scheduling to ensure water quality. The plant boundary and office range set up infrared countermeasures dual monitoring system, production workshop set up camera monitoring, in the central control room can be observed at any time the situation of the production line, a change in the sewage treatment plant requires a large number of workers in the tradition, greatly reducing the operating costs. Moreover, the fully automatic recording system provides the traceability of the production condition, which provides favorable conditions for the statistics of water quality data of influent water and summarizing the operation experience.
3, closed production plant. The East District Wastewater Treatment Plant is the earliest wastewater treatment plant in China to adopt steel structure cover, which not only minimizes the impact on the surrounding environment, but also makes the appearance of the plant give the impression of a modern factory.
Shaoguan City, the first sewage treatment plant
This project is one of the blue sky and blue water projects in Guangdong Province. The project is strictly in accordance with the "Chinese People's *** and the State Bidding Law" procedures, the expert evaluation committee decided to City Valve Machinery Co., Ltd. for the winning unit, general contracting the project survey, design, civil construction, equipment installation, commissioning, personnel training. The project covers an area of about 2 hectares, control land of about 7 hectares, the first phase of the construction scale for the daily treatment of 15,000 cubic meters of sewage, the second phase of the construction scale to increase the daily treatment of sewage 30,000 cubic meters of sewage, designed by the Guangzhou Municipal Design Institute. Sewage treatment using advanced, mature biochemical (activated sludge method) process, the construction of the project to protect and improve the urban area of the West River two water plant, Shiliting water plant and Wuliting water plant drinking water sources, improve the quality of the urban environment, optimize the investment environment has far-reaching significance.
Shenzhen Water Group Co., Ltd. Binhe sewage treatment plant
The project is located in Futian District, Shenzhen City, Guangdong Province, Binhe Avenue, No. 2 compound Binhe sewage treatment plant, covers an area of 13.87 hectares, the service area for the western part of the Luohu District and the eastern part of the Futian District of about 27.5 square kilometers, serving a population of about 540,000 people, the daily sewage treatment of 300,000 tons.
The total investment of the project is 450 million yuan.
Shenzhen Binhe Sewage Treatment Plant, the second phase of the project activated sludge secondary sewage treatment system was completed in 1987. The system mainly deals with urban domestic sewage in Luohu and Futian districts of Shenzhen, with a daily treatment capacity of 25,000 m3 After more than ten years of operation, we have gradually worked out a set of sewage treatment process methods suitable for the characteristics of sewage quality in Shenzhen according to the characteristics of the existing equipments, and on the basis of summarizing the practical experience and combining with the latest development trend of the sewage treatment process, we have been actively exploring the best ways to renovate the old equipments and structures. The best way.
1 design process
Design parameters of activated sludge process:
Inlet water quality: BOD5=200mg/L, SS=240mg/L;
Effluent requirements to meet the national requirements for the discharge of secondary treatment, i.e., pH=6.5-8.5, SS is less than 30 mg/L, BOD5 is less than 30 mg/L, CODCr is less than 120mg/L, CODCr is less than 120mg/L, BOD5 is less than 30 mg/L, CODCr is less than 30 mg/L. CODCr less than 120mg/L
The process flow is shown in Figure 1.
Figure 1 Process flow diagram of Riverside Wastewater Treatment Plant
(1) Coarse grating Mechanical grating bar spacing is 20mm.
(2) Aerated sand sedimentation tank The front end of the aeration sand sedimentation tank is equipped with a fine grating, and the spacing of the grating is 10mm.
(3) Aeration Sand Sedimentation Tank The sand sedimentation tank was originally designed to be in the form of a dore sand sedimentation tank. The sand sedimentation tank was originally designed as a dor form, by the sand pump will be water and sand mixture sucked into the separation tank for water and sand separation, and then due to the unsatisfactory actual operating results, according to the form of advection tank was rebuilt, the use of mechanical sand scraper for sand removal.
(3) Primary sedimentation tank The primary sedimentation tank is two 25m diameter circular spoke flow sedimentation tank, pool side depth of 3.14m, sedimentation time of 1.5h. Designed to remove 60% of the suspended solids, to remove the BOD5 load of 25% to 30%.
(4) Aeration tank Aeration tank is divided into 2 groups, each group of 4 corridors, two groups of pools used in parallel. Total effective volume 8350m3, water depth 6 m. Hydraulic retention time 8h, sludge load 0.2kgBOD5/(kgMLSS?d).
(5) Secondary sedimentation tank The secondary sedimentation tank is 2 circular spoke-flow sedimentation tanks with a diameter of 30m, with a water depth of 3.97m at the edge of the tank, and a sedimentation time of 2.5h.
(6) Sludge reflux pumping station The secondary sedimentation tank activated sludge reflux adopts 3 sets of 700mm spiral reflux pumps, with a reflux rate of 85%, and there is no standby.
(7) Dewatering machine Sludge dewatering adopts belt dewatering machine, with stable performance and high efficiency, but with poor sanitary conditions.
2 Purification mechanism and process characteristics
Ordinary activated sludge method, as a traditional sewage biological treatment process, is a sewage treatment with high treatment efficiency. The microorganisms in activated sludge are mainly bacteria, protozoa and algae, of which bacteria mainly exist in the state of bacterial colloid and filamentous bacteria. In the traditional activated sludge method, the cultivation of a certain concentration of activated sludge with good settling performance is the key to operation and to ensure the quality of effluent water.
3 Water quality of influent water
The influent water quality of Shenzhen Binhe Wastewater Treatment Plant fluctuates relatively greatly, with the highest influent BOD5 concentration of 450 mg/L and the lowest of 80 mg/L. The frequency of influent BOD5 concentration between 100 mg/L and 200 mg/L is 54%, and the frequency of influent BOD5 concentration between 200 mg/L and 300 mg/L is 26.5%, and the frequency of influent BOD5 concentration between 200 mg/L and 300 mg/L is 26.5%, and the frequency of influent BOD5 concentration between 200 mg/L and 300 mg/L is 26.5%. The frequency was 26.5%, and the frequency of influent BOD5 greater than 300mg/L was about 10%. The average influent BOD5 concentration was 190 mg/L. The frequency of influent SS concentration between 120 mg/L and 240 mg/L was 76%, and the frequency of influent SS concentration greater than 240 mg/L was 24%, and the average influent SS concentration was 146 mg/L. The highest influent CODCr concentration was 2000 mg/L, and the lowest influent CODCr concentration was 200 mg/L, and the average influent CODCr concentration was greater than 300 mg/L. The average influent CODCr concentration was 146 mg/L, and the average influent CODCr concentration was 146 mg/L, and the average influent CODCr concentration was 146 mg/L. The maximum influent CODCr concentration is 2000mg/L, the minimum influent CODCr concentration is 200 mg/L, and the average influent CODCr concentration is more than 380 mg/L. The main component of the influent suspended solids is sludge.
4 Operation
Shenzhen belongs to the subtropical oceanic climate, the average annual temperature is 23 ℃, the highest average monthly temperature in summer is 28 ℃, the lowest average monthly temperature in winter is 15 ℃, the temperature difference between the four seasons is small, and the temperature of urban wastewater is suitable for microbial reproduction.
The influent water of Binhe Wastewater Treatment Plant is mainly domestic sewage, only a small amount of industrial wastewater, the influent water BOD5/ CODCr is more than 0.3, and the biochemical process of wastewater is easier to carry out. The abnormal change of influent CODCr can reflect the abnormal change of influent BOD5.
Riverfront Wastewater Treatment Plant influent water is often floating, silt, construction sand and gravel. The original design of the use of dore sand sedimentation tank with sand pump operation is not appropriate, sand pumps are often clogged, the residence time of dore sand sedimentation tank is too long, the sediment contains too much mud, the original design of the use of the sand-water separator can not be very good dewatering, resulting in production and operation of the difficulties.
After that, according to the actual influent water quality condition, the Dore sand sedimentation tank was modified according to the principle of advection tank, the height of weir plate was lowered, the aeration pipe was added, and simple and efficient mechanical sand scraping method was used instead, which solved the difficulty of sand-water separation and reduced the sedimentation of sludge.
After primary sedimentation, the removal rate of SS reaches 56.2%, the removal rate of BOD5 reaches 45.8%, and the CODCr removal rate reaches 51.2%. The average SS concentration in the effluent of the primary sedimentation tank was 64mg/L, the average BOD5 concentration was 103mg/L, and the average CODCr concentration was 185.3mg/L. Because of the large content of suspended sludge in the influent water, the removal rate of suspended organic matter by primary sedimentation was higher than the design value. Because part of the influent water quality exceeds the design standard, the frequency of SS concentration in the effluent of primary sedimentation tank exceeds the design value is 8.4%; the frequency of BOD5 concentration in the effluent water exceeds the design value is 13.4%, which forms the impact load on the aeration tank.
The nature of the activated sludge in the aeration tank directly affects the quality of the effluent water, the composition of the activated sludge has both bacterial colloid and filamentous bacteria. The growth of activated sludge is determined by nutrients, water temperature, pH and other factors. The concentration of activated sludge is an intrinsic factor that affects the sludge load.
The sludge load of the aeration tank N (kgBOD5/(kg MLSS?d)) and the sludge concentration MLSS:
N=QLa/(XV)
Where Q - sewage flow, m3/d;
La - aeration tank influent BOD5 concentration, mg / L;
X - aeration tank X - aeration tank sludge concentration MLSS, mg / L;
V - aeration tank volume, m3.
Riverside Wastewater Treatment Plant aeration tank activated sludge concentration is maintained at 1000mg / L or so, the sludge load of the aeration tank for an average of 0.31kg BOD5/(kg MLSS? d), greater than the design value.
The settling performance of activated sludge is an important factor affecting the effluent quality of the secondary sedimentation tank, and controlling the settling ratio of activated sludge at a reasonable level depends on the influent water quality such as pH, nutrients, water temperature, and design parameters of the secondary sedimentation tank. The monitoring results show that the activated sludge settles well in the secondary sedimentation tank when the sludge settling ratio SV of the aeration tank is less than 40%. When the concentration of activated sludge in the aeration tank was below 900 mg/L, filamentous bacteria had the opportunity to multiply. The ability of filamentous bacteria to decompose organic matter is stronger, and the degradation of organic matter by the increase of filamentous bacteria is even stronger than the activated sludge when the bacterial colloid is dominant, but the mud-water separation ability is poor, and it has a great influence on the SS of the effluent of the secondary sedimentation tank. When the concentration of activated sludge in the aeration tank is lower than 800mg/L, filamentous bacteria will cause serious sludge expansion. In actual production, sludge swelling can be prevented by taking the sludge settling ratio of 40% as a reference value and combining it with microbial microscopy. The activated sludge method operating at low concentration is more likely to cause sludge expansion than when operating at high concentration.
5 Effluent water quality
Shenzhen Binhe Wastewater Treatment Plant activated sludge system for organic matter, suspended solids can be removed with high efficiency, BOD5, SS removal rate can reach more than 90%, the effluent BOD5, SS to meet the national secondary treatment discharge standards, less than 30 mg / L; CODCr removal rate can reach more than 80%, the effluent CODCr is less than 120 mg/L, the average of effluent CODCr is 32.88 mg/L, and the frequency of effluent CODCr concentration below 60mg/L is 89.2%.
6 operation management
The traditional activated sludge method of sewage treatment system operation, due to frequent changes in influent water quality, fluctuations are large, in order to maintain stable operation of the aeration tank, with the changes in influent water quality and timely adjustment of the operating parameters is to maintain stable operation of the key. Through long-term operation practice and the regularity of water quality analysis results of the study, we get the following conclusions:
When the effluent BOD5, SS is greater than 20mg/L or aeration tank activated sludge settling ratio is greater than 40%, the operation section needs to be adjusted in a timely manner sludge reflux ratio, in order to maintain the normal performance of activated sludge.
The effluent CODCr has trend correlation with effluent SS and BOD5, while the measurement of CODCr and SS is relatively rapid, and the measurement of BOD5 has lag. When the effluent CODCr is greater than 60mg / L, appropriate adjustments to the sludge reflux ratio, increase the concentration of activated sludge in the aeration tank, to maintain the effect of organic matter removal, to maintain stable operation.
7 Summary
Traditional activated sludge method is a low-cost and high-efficiency wastewater treatment method, which can efficiently remove organic matter, and the activated sludge method with a long retention time also has the function of nitrification, but the traditional activated sludge method is prone to sludge expansion in operation, and has poor resistance to shock loads when operating with low activated sludge concentration. In the Pearl River Delta region, the traditional activated sludge method is transformed into A/O method or oxidation ditch is used for sewage treatment, which is more stable in operation, enhances the ability to resist shock load and sludge expansion, and is easy to realize automatic management.
Contact Address: Room 610, No. 2 Compound, Binhe Avenue, Shenzhen, Guangdong Province, China Zip Code: 518031Shenzhen Water Group Limited Nanshan Sewage Treatment Plant
Nanshan Sewage Treatment Plant under the Municipal Drainage Management Office, located in Nantou, half a bird on the banks of the Moon Bay, is an important part of the Shenzhen City, Shenzhen sewage discharge project; by the Shenzhen City Water Supply and Drainage Engineering Construction Command is responsible for the construction, Nanchang Nonferrous Metallurgical Design and Research Institute design, Shenzhen Municipal Engineering Company and other units of construction; started in March 1988, was completed and put into operation in November 1989, a project size of 50,000, an investment of 45 million yuan, the scope of its services for the Nantou, Nanyou, as well as part of Shekou, serving a population of 85,000 people; the second phase of the project in December 1989 The second phase of the project was started in December 1989, and on June 25, 1997, the ocean discharge pipe and the sludge part of the plant were completed and put into use. After the completion of all the projects, the service population is 1,216,800, and the sewage treatment is 736,000m3/d; it covers an area of 15.416 hectares.
Shenzhen Sewage Discharge to the Sea Project is to convey the city sewage west of Huanggang Road in Futian District to Nanshan Sewage Treatment Plant through the interceptor (canal) system, and then send it to Ma Wan under pressure with pumps after primary treatment, and then enter into the oceanic outfall pipe through the working well, and then discharge the sewage uniformly through the diffusers into the deep sea in the mouth of the Pearl River, and make use of the huge dilution self-purification capacity of seawater to meet the requirements of environmental protection. This project includes the interception of sewage from Huanggang Road to the mouth of the sea (canal), a length of 32.04km, Binhe, Xinzhou, Fengtang, Houhai, Qianhai, Dengliang and other six sewage raised pumping station; Nanshan Sewage Treatment Plant, a; ocean outfall pipe, a length of 1,609m. Shenzhen City sewage discharged into the sea of the project is designed to serve the population of 1,268,000 people (of which 1,014,000 permanent and temporary residents, mobile population of 202,800 people). 202.8 million). The total discharge of sewage is 73.6m3/day (the discharge quota is 650 liters/person/day for permanent and temporary population and 360 liters/person/day for mobile population). Day, mobile population 360 / liter. Day, plus 0.4m3 / day in the development zone near Ma Wan.
Nanshan Wastewater Treatment Plant treatment process
Sewage by the total lifting pump room grating interception, and elevated by submersible pumps through the fine grating into the aeration and sand sedimentation tanks, sewage
Address: No. 16, Yueyunwan Avenue, Nanshan District, Shenzhen, China
Tel: 0755-26489894