Baoji city area is distributed along the Weihe River Kawaguchi band, the Weihe River is the main body of sewage in Baoji, in recent years, the water quality of the Weihe River is seriously polluted, and the groundwater resources on both sides of the river have been infringed upon to varying degrees. The construction of a sewage treatment plant with a daily sewage treatment capacity of 120,000m3 in Shilipu at the downstream of Weihe River will solve the sewage treatment problems of five districts, including Fulinburg, Baliqiao, downtown, Shangmaying and Shilipu. The new sewage treatment plant service area of 19.5km2, accounting for 50% of the total area of the city, the service area of the current population of about 350,000 people, accounting for 60% of the total population of the city.
Baoji Shilipu sewage treatment plant construction project, "Feasibility Study Report" by the Provincial Planning Commission, Shaanxi Planning Investment (2001) No. 275 approved the project, the project, "Preliminary Design" by the Shaanxi Planning Project (2001) No. 907 approved. Project by the Baoji City Urban Construction Bureau in charge, Baoji Shilipu sewage treatment plant is responsible for the construction of the preparatory office. Project preliminary design approved budget estimates total investment of 143 million yuan. Funding sources for the national debt, loans and self-financing. Design scale for the daily sewage treatment of 120,000m 3, of which, a (this phase) daily sewage treatment of 90,000m3. The second phase of the expansion to 120,000m3 per day, the project covers an area of 89.9 acres. The project adopts advanced improved SBR secondary biochemical sewage treatment process, the treated sewage reaches the primary discharge standard, of which 10,000m3 per day will be further processed in depth to reach the standard of water reuse. The project started in September 2002, the planned construction period of two years, is expected in June 2004 can be completed ahead of schedule.
Shilipu sewage treatment plant project is progressing well. To date, has been completed Ⅰ #, Ⅱ #, Ⅲ # (single pool volume of 30,000m 3) SBR biological pool of civil construction; the total intake wells, intake channels, lifting pumping station, cyclone sand sedimentation tanks and sand water separation between the civil works; sludge treatment area to complete the sludge thickening tanks, sludge dewatering machine room and sludge storage and transportation between the main project; ancillary works to complete the total, the total sub-substantiation and distribution of the civil works of the power room. Complete sets of equipment and main materials have arrived for acceptance and installation one after another. Piping and cable installation works are also in progress at the same time. Up to now the project has completed a total investment of 83.79 million yuan.
Now the sewage treatment plant construction has entered the final stage, civil construction and equipment installation has completed the main work. Collected municipal wastewater has been in March 2004 into the pool, the beginning of biological strains and activated sludge cultivation, roads, fences, landscaping, comprehensive building and other subsequent construction work; complete sets of equipment for the joint commissioning; SBR treatment process debugging and commissioning will be to ensure the quality of the project under the premise of a reasonably compressed schedule to speed up the construction progress, and strive to be completed in June 2004 to ensure that the end of June three series of biological pool SBR wastewater treatment plant has entered the final stage. At the end of the three series of biological pool SBR sewage treatment process smooth operation, to meet the design discharge standards.
Address:
Postcode:721000
Telephone:0917-3230206
Hanzhong City Urban Sewage Treatment Plant
1, the sewage treatment plant overview:
Hanzhong City, the first phase of the urban sewage treatment plant project successfully passed the environmental protection acceptance and into the Formal operation. Hanzhong City, urban wastewater treatment plant is the Han River along the Shaanxi section of the first completed and put into operation of the city's wastewater treatment plant, which was built to alleviate the water pollution situation in the Han River, effectively guaranteeing the quality of the Han River as a water source of the South-to-North Water Diversion Project Central Line.
The design scale of the sewage treatment plant for the daily treatment of urban sewage 100,000 tons, a project to deal with urban sewage 50,000 tons / year. The project is the use of state bonds, government investment, bank loans and the Danish government equipment loans to build the city's industrial wastewater and sewage centralized purification and treatment of an important urban infrastructure projects, the use of DE oxidation ditch process of secondary biochemical sewage treatment plant. After a year of trial operation, its water, mud indicators are strictly controlled in accordance with national standards, stable and meet the standards, with the conditions for formal operation. Sewage treatment plant phase I project can handle Hanzhong City, urban areas of 50% -60% of industrial wastewater and domestic sewage, including Hanjiang Pharmaceutical Factory, nitrogen fertilizer plant and other dozen of enterprises production wastewater and all the residents of the city's east of domestic sewage. After the completion of the second phase of the sewage treatment plant, its service area can cover most of the urban areas in Hanzhong City, and at the same time, it will develop the water reuse project, which can reduce the water pollution of Hanjiang River and save water resources effectively at the same time.
2. Process and description
(1) Phase I adopts the sexual sludge treatment process, that is, adsorption biodegradation method.
The process flow is as follows:
Sewage → pumping station outside the plant → coarse grating → lifting pump room inside the plant → fine grating? → aeration tank sedimentation tank → selection tank → oxidation ditch → final sedimentation tank → contact tank → Han River (see notes)
Sewage enters the plant first through the coarse grating to separate large pieces of garbage, like bags of rubber, leaves and so on. The trash comes out and is disposed of by the sanitation department. Since the water level coming into the plant from the pipeline is very low (the plant is higher than the level), the lifting pump house plays a big role in order to work easily. Here, six 3,000 m3/h submersible lifting pumps are used, with a pump head of 17 meters, so that the later processes can be carried out at ground level. The fine grating is to go to the small pieces of garbage.
The aeration sedimentation tank is used to remove the fine inorganic particles in the sewage (such as mud and sand, cinder, etc.) as well as the surface oil.
The next one is the key place for decontamination. Divided into two parts, the aeration tank and sedimentation tank. First in the aeration tank water mixed with activated sludge (a by microorganisms, bacteria and other components of the bacterial colloid), the bottom of the pool microporous oxygen non-stop out of the promotion of its metabolism, the activated sludge adsorption and degradation of organic matter; and then the water into the sedimentation tank, sedimentation tank for the removal of suspended solids, such as SS, and at the same time to remove part of the BOD5. In the end of the activated sludge sedimentation, separation, and then return to the aeration tank degradation of the next pool of water. After the activated sludge settles and separates, it is returned to the aeration tank to degrade the next tank.
In addition, there are three systems in the aeration and sand sedimentation tank, the air supply system, the reflux system and the residual sludge discharge system (the amount of microorganisms should not exceed the standard, if too much to be discharged). The two processes are combined together, the water has removed most of the organic matter, has reached the national emission standards, can be directly discharged into the Han River.
The Han River could have achieved self-purification by relying on the rich biological chain, only due to the strong pollution of domestic sewage, the original long biological chain becomes shorter, the short biological chain becomes almost disappeared, so that the water quality will deteriorate, and sewage plant is only the use of micro-organisms to strengthen its self-purification function, to remove domestic sewage to bring excessive nitrogen, phosphorus and organic matter, and to improve the phenomenon of its eutrophication. (In addition because the treatment is not industrial sewage, no special treatment for metal pollution is required.)
(2) Phase II is under planning.
Phase I design of sewage water quality: BOD5: 150mg/l; SS: 180mg/l; T-N: 35mg/l; T-P: 5mg/l.
Out of the water quality standards: BOD5 ≤ 25mg/l; SS ≤ 25mg/l; NH3-N ≤ 10mg/l; T-P ≤ 3.5mg/l. 3.5mg/l.
Output water quality standard: BOD5≤20mg/l; SS≤20mg/l; NH3-N≤10mg/l; CODcr: ≤60 mg/l, phosphate: ≤0.5 mg/l.
On the sewage sludge produced in the process of wastewater treatment, Phase I of the project adopts the way of bio-sludge direct dewatering, and the dewatered sludge will be further deepened. After dewatering, the sludge will be further deepened, and at the same time, the recycling of resources will be realized. Sludge disposal in the near future for transportation to landfill, and in the long term will realize the recycling of resources.
3. Advantages and problems of the process
(1) Advantages:
1) The design of the biological reaction tank, sedimentation tank, reflux pumping station is a whole square tank, which saves nearly 40% of the land than the separation of the circular amplitude flow tank, separation of reflux pumping station and other conventional practices.
2) After dewatering, the dry sludge is successfully transported by large-capacity high-pressure screw pumps to the Pearl River by long-distance pipeline and loaded onto ships directly. It makes the sludge transportation get very good bad condition, which is the first one in China and also the largest capacity and the farthest transportation distance in foreign countries.
3) Sewage precipitation out of the stainless steel submersible perforated pipe, the effect is good, the domestic leading.
4) The biological filtration deodorization is used to remove the odor produced by the sedimentation tank. In the domestic municipal wastewater treatment is still leading.
(2) Problems:
1) The project was originally implemented according to the national comprehensive sewage discharge standards before 1998. Since January 1, 1998 after the implementation of the new standards, the phosphorus removal requirements have increased. In the future, the first phase of the process of biological reaction tank can be slightly modified to improve the effect of phosphorus removal, so that the first phase of the effluent and the later completion of the second phase of the effluent is equivalent.
Tongchuan City Sewage Treatment Plant
Tongchuan City Sewage Treatment Plant is a business unit, the implementation of career management mechanism, the main function is to collect and treat industrial wastewater and sewage in the old urban area of Tongchuan City. The plant has 62 employees, including 24 people with college degrees or above, 6 people with high and intermediate titles, high quality personnel. The plant is now set up in the office, production and technology section, accounting and finance section and other sections, the party, politics, labor, and the organization is sound.
Total investment of 68.92 million yuan of engineering projects, is a provincial and municipal key construction projects, completed in December 2003, the plant **** 6 SBR tanks and other sewage treatment facilities, with a total length of 3 kilometers of self-supplied power supply line, outside the plant laid sewage collection of the main, branch pipe network 17KM, set up the inverted siphon 10, pressurized elevation of the pumping station 2, the completion of sewage inlet 110, with the use of Domestic more advanced SBR biochemical treatment process to deal with sewage, sewage treatment design scale of 35,000 tons / day, the service area for Tongchuan City, Wangyi District and Yintai District.
The project was launched on June 9, 2005 trial run, August 2 to achieve the official operation, monitored by the relevant departments, the water COD, BOD5, SS and other major indicators to meet the national standards for secondary water discharge. December 6, Tongchuan City, the sewage treatment project successfully passed the provincial completion inspection and acceptance of the official announcement of the Tongchuan City, the history of zero treatment of sewage to an end. At present, the daily sewage treatment capacity of 17,000 cubic meters, sewage treatment facilities, equipment in good operating condition, process stability. Tongchuan City, the official operation of the sewage treatment plant in the treatment of urban sewage in Tongchuan plays an important role in the protection of water resources in Tongchuan, improve the water pollution of the Chishui River in Tongchuan, to protect the downstream Weihe River system is of great significance and far-reaching impact.
Tongchuan City, Tongchuan sewage treatment plant in October 2000 to start construction, completed in December 2003, the design capacity of 35,000 tons of sewage treatment / day, the level of treatment for the Ⅱ, using the SBR treatment process, the effluent going to the city of the Weihe River's second-level tributaries of the Lacquer Water River, June 9, 2005 official operation. The plant's wastewater treatment facilities operate normally, the main pollutants into the water concentration: COD: 471.8mg/L; BOD: 208.2mg/L; total nitrogen: 51.5mg/L; total phosphorus: 4.1mg/L, the main pollutants of the effluent concentration of COD: 70.8mg/L; BOD: 13.7mg/L; total nitrogen: 26.04mg/L; total phosphorus: 0.84mg/L, to meet the discharge standards. The total nitrogen:26.04mg/L;total phosphorus:0.84mg/L, meet the emission standard. After drying the sludge through the concentration pool, the sludge is compressed and molded and sent to the landfill.
Weinan City Sewage Treatment Plant
Weinan City Urban Sewage Treatment Plant is located in Zhangzhuang East, Weinan City, covering an area of 10,037 acres, with a recent design scale of 60,000 tons / day, and a long term of 100,000 tons / day. The effluent implementation of "GB8978-1996" in the first standard Trojan.
Projects began to prepare for the construction in 1999, a project completed in 2004, is the first Weinan City, the construction of sewage treatment plant. The total investment in the project was about RMB 11.5 billion, of which US$4.69 million was utilized as a loan from the Danish government.
The sewage treatment process utilizes a sequential batch activated sludge process (SBR process), with some of the treated sewage used as a water reuse plant, and the rest discharged into the You River. Sludge treatment process adopts sludge concentration and dewatering body machine direct dewatering process, the treated sludge is used for greening fertilizer or sanitary landfill.
Weinan City urban sewage treatment plant as a result of the use of advanced treatment processes, and therefore has a short process, occupies an area to save energy, energy saving, sewage treatment water quality standard; Tail high characteristics. At present, the project's follow-up project, the daily treatment capacity of 40,000 tons of Phoenix water plant project is being built.
Xi'an Beishiqiao Sewage Purification Center
Xi'an Beishiqiao Sewage Purification Center with nitrogen and phosphorus removal DE-type oxidation ditch system (before anaerobic pool), a project capacity of 150,000 m3 / day, the treatment effect of the various stages of the measured results show that the DE-type oxidation ditch treatment of municipal sewage effect is significant. COD, TN, TP total removal efficiency were The total removal efficiency of COD, TN and TP reaches 87.5%-91.6%, 63.6%-66.9% and 85.0%-93.4% respectively, and the effluent TN is 9.0-10.1mg/l and TP is 0.42-0.45mg/l. The effluent quality is excellent. / l, the water quality is better than the national secondary water discharge standards.
Postal Code: 710086
Area Code: 029
Corporate: Cao Yu Tel: 84297981
Address: Xiyao Tou
Main Products: Wastewater Treatment
Xi'an City Wastewater Treatment Plant
Xi'an City Wastewater Treatment Plant Renovation Project was completed, the completion of the project, it is capable of providing daily 6 x 104m3 /d of recycled water for industrial water and municipal miscellaneous water in the western suburbs, opening up a second water source for the water-scarce Xi'an. In addition 6 × 104m3 /d secondary treatment degree than the status quo has also improved, according to the project design of the water quality, the project was rebuilt into the annual reduction of pollutants discharged to the Soap River BOD5 = 9782 tons, SS = 14563.5 tons, COD = 18060.2 tons. Because of the reduction of pollutants into the Soap River, the Soap River water environment will be greatly improved.
The Xi'an Municipal Sewage Treatment Plant is one of the earliest urban sewage treatment plants in Xi'an. It was built in 1956, put into operation in 1958, the daily treatment capacity of 4 × 104 m32 / d; 1963 for the first expansion, the daily treatment capacity increased to 6 × 104 m32 / d, sewage for the first level of mechanical treatment, the sludge is digested by the medium temperature, natural drying and dewatering; 1976 for the second expansion, the capacity of 12 × 104 m32 / d, sewage for the second biological The second expansion was carried out in 1976, the treatment capacity reached 12×104 m32/d, the sewage was secondary biological treatment, and the sludge was mechanically dewatered after medium temperature digestion.
The plant has undergone two expansions, but limited to the conditions at the time, many of the equipment for the non-sewage treatment project-specific equipment, after many years of operation, the decline in equipment performance, high energy consumption, processing efficiency, backward technology, unable to maintain normal production and operation, and treatment of water quality is difficult to ensure. To this end, the plant to carry out a comprehensive technical renovation and appropriate expansion, update the equipment to achieve stable treatment results, improve the treatment capacity, energy saving and reduce consumption, to ensure water quality, and to achieve part of the reuse of sewage.
The project's total investment of about 110 million yuan (including 3.96 million U.S. dollars Danish government loan), the main equipment and technology introduced from the Danish krüger company, the current renovation project is being implemented, civil engineering is expected to be completed by the end of May this year, mechanical and electrical equipment is being installed, and is scheduled for the end of 2001 through the water test run.
Introduction of the process
Xi'an City sewage treatment plant mainly treats industrial wastewater and domestic sewage in the western suburbs of Xi'an City, with industrial wastewater accounting for 70% of the total treatment capacity and domestic sewage accounting for 30%. At present, the treatment capacity of the plant is 12×104m3/d secondary biological treatment, and it will reach 16×104m3/d after the completion of the reconstruction and expansion, among which 4×104m3/d primary treatment is discharged into the Soap River through underground culvert, 6×104m3/d is discharged after medium-loaded biological treatment, and the other 6×104m3/d is treated by A 2/o+ flocculation and filtration process for reuse as municipal miscellaneous water and industrial cooling water.
The water quality of water intake is: COD=450mg/l TN=40mg/l
BOD5=220mg/l TP=8.5mg/l
SS=300mg/l NH3-N=26mg/l
PH=6.5～8.5 Water temperature T=13-25℃
The renovation is mainly for the wastewater treatment process and equipment. The main purpose of this renovation is to renovate the sewage treatment process and equipment to improve the treatment efficiency and water quality. The A2/O aeration tank is renovated on the basis of the original common push-flow aeration tank, and its residual activated sludge is thickened and then directly subjected to mechanical dewatering. The medium load system adopts the traditional activated sludge method, and its sludge is mechanically dewatered directly after sludge thickening and medium-temperature digestion, and the solid rate of dewatered sludge is about 20%.
After the transformation, it is expected that the effluent water quality can reach the following indexes:
Medium-load system: COD≤100mg/l
BOD5≤30mg/l
SS≤30mg/l
PH=6.5-8.5
A2/O system sand filtration water: COD≤50mg/l TN ≤15mg/l
BOD5≤10mg/l TP≤1mg/l
SS≤5mg/l NH3-N≤5mg/l
PH=6.5～8.5
Xian municipal wastewater treatment plant renovation project is completed, can provide 6×104m3 /d recycled water for the western suburbs of the region's industrial and municipal water. Miscellaneous water, for the lack of water in Xi'an city opened up a second source of water. In addition 6 × 104m3 /d secondary treatment degree than the status quo has improved, according to the design of the project in and out of the water quality, the project was rebuilt into the annual reduction of pollutants discharged to the Soap River BOD5 = 9782 tons, SS = 14,563.5 tons, COD = 18,060.2 tons. Because of the reduction of pollutants into the Soap River, so the Soap River water environment will be greatly improved.
Yan'an City Sewage Treatment Plant
Yan'an City Sewage Treatment Plant is located in Yan'an City, Qiaogou Town, the plant covers an area of 115 acres, in December 21, 2001 in Yan'an City Administration for Industry and Commerce registered, the registered capital of 50 million yuan RMB, the main business of sewage treatment, sewage fertilizer processing,
Yan'an City, sewage treatment project with a total investment of 188.88 The total investment of 18,888,000 yuan, including sewage treatment plant and urban sewage collection pipeline network system two major parts, all under the jurisdiction of the sewage treatment plant. The project was completed in March 2003 into the water commissioning, water quality basically meets the national comprehensive sewage discharge (secondary) standard requirements, sewage treatment plant supporting four daily treatment of 12,500 cubic meters of Orbar oxidation ditch (Orbar Ditch). Two of them have completed the supporting production equipment, forming a daily treatment capacity of 25,000 cubic meters. The civil works of the other two oxidation ditch plants have been completed. At present, one oxidation ditch is put into trial operation in terms of sewage collection volume and economic efficiency. According to statistics, in January ----7 2004 **** treated 2,858,400 cubic meters of sewage, with an average daily capacity of 13,600 cubic meters, which has reached and exceeded the design level. Forecasted near-term treatment capacity of 25,000 cubic meters / day, the long-term treatment capacity of 50,000 cubic meters / day.
Address: Qiaogou East Shilipu
Postal Code: 716000
Telephone: 2211328
Registration Date: 10/16/1998
Administrative District No.: 612601
Number of Employees: 62
Forced by: Xu Yaping
Operating Scope: Responsible for sewage treatment and discharge in urban areas.