Give you an example: i. Purpose of the internship: Production internship is a very important part of the practical aspects of students' university studies. Internship is a must for every university graduate, it not only lets us learn a lot of knowledge in the classroom simply can not learn, but also makes us broaden the horizons, growth of insights, for us to better apply the knowledge we have learned to the actual work of laying a solid foundation. Through the production internship, I have a deeper contact with professional knowledge, further understanding of the actual environmental protection work, understanding of the environmental governance process problems and theoretical and practical conflict of the difficult problems, and through the writing of the internship report, so that I can learn to comprehensively apply the knowledge I have learned, improve the ability to analyze and solve professional problems. II. Internship specific content: (a) West sewage treatment plant Internship time: October 19, 2004 - November 29, 2004 1. Sewage plant profile: Guangzhou Economic and Technological Development Zone sewage treatment plant is the Development Zone Management Committee invested in key environmental protection projects, the main plant is located in Guangzhou Economic and Technological Development Zone, Zhicheng Avenue West 22 (Xiji Industrial Zone), occupies an area of about 1,000 square meters, the total area of the sewage treatment plant. (Xiji Industrial Zone), covers an area of 78,600 square meters. The plant treats 30,000 tons of industrial wastewater and domestic sewage per day, with a vision of 90,000 tons. Guangzhou Economic and Technological Development Zone sewage treatment plant plant in September 1992 groundbreaking, August 1994 was put into operation. Since the establishment of the plant, the plant insists on the implementation of total quality management, taking human management as the key to quality management, production and operation management as the core of quality management, and equipment management as the basis of quality management, emphasizing every link to ensure that the effluent quality of wastewater treatment all meets the design requirements and is better than the design of the national secondary discharge standards. Emphasizing and strengthening the technological transformation, the plant has achieved better economic and social benefits in terms of energy saving and consumption reduction, and was awarded the National Advanced Unit of Operation and Management of Urban Sewage Treatment Plant and the Advanced Unit of Guangdong Province in 1999 and 2001 respectively. The plant is the designated internship base of South China University of Technology, South China Normal University and other institutions of higher learning. In June 2001, the plant successfully passed the ISO14000:1996 environmental management system certification, becoming the first city sewage treatment plant in China to pass ISO14000 environmental management system certification. The plant has 8 lifting pumping stations in the periphery of the main sewage treatment plant, the sewage treatment plant in the East District of Guangzhou Economic and Technological Development Zone (Export Processing Zone), and the sewage treatment plant in Yonghe Economic Zone of Guangzhou Economic and Technological Development Zone (Taiwan Business Investment Zone). The main plant adopts the form of lifting and transmission of water from peripheral pumping stations to collect and treat industrial wastewater and domestic sewage in the western area of Guangzhou Economic and Technological Development Zone. The main function of the plant is to be responsible for the safe and normal operation of the sewage pumping station, sewage treatment and sludge treatment, and to ensure that all sewage coming into the plant meets the standard of discharge after treatment. The functional departments of the main plant include the director's office, the deputy director's office, the production section, the technical section, the comprehensive section and the office. The main positions in the production section are pumping station operation, sewage treatment operation, sludge treatment operation, laboratory and warehouse management. 2. Treatment process: The West District General Plant adopts the traditional activated sludge process with impeller surface aeration as the main body, and all domestic equipment is used. Sewage treatment uses various methods to separate the pollutants in the sewage or transform them into harmless substances, so that the sewage can be purified. Classification of sewage treatment methods: (1). Physical treatment method. Such as filtration method, sedimentation method. (2). Physicochemical method. Such as coagulation and precipitation method. (3). Biological treatment method. The use of microorganisms to adsorb, decompose and oxidize the organic matter in the sewage, and degrade the unstable organic matter into stable and harmless substances, so that the sewage can be purified. Activated sludge method is one of the biological treatment methods. Activated sludge process is the most widely used wastewater aerobic biochemical treatment technology, which is mainly composed of aeration tank, second sedimentation tank, aeration system and sludge return system. Wastewater enters the aeration tank at the same time as the activated sludge returning from the bottom of the secondary sedimentation tank after the primary sedimentation tank, and through aeration, the activated sludge is in suspension and comes into full contact with the wastewater. Suspended solids and colloidal substances in the wastewater are adsorbed by the activated sludge, while the soluble organic matter in the wastewater is used as nutrition by the microorganisms in the activated sludge for their own reproduction, metabolically transformed into material cells, and oxidized into the final product (mainly CO2). Non-soluble organic matter needs to be converted into soluble organic matter before it can be metabolized and utilized. Wastewater is thus purified. After purification, the wastewater and activated sludge are separated in the secondary sedimentation tank, the upper effluent is discharged, and a portion of the separated and concentrated sludge is returned to the aeration tank to ensure that a certain concentration of activated sludge is maintained in the aeration tank, and the rest of it is residual sludge, which is discharged from the system. The influencing factors of activated sludge reaction are as follows: (1). BOD loading rate (F/M), also known as organic loading rate (2). Water temperature (3). PH (4). Dissolved oxygen (5). Nutrient balance(6). Toxic substances Aeration device: 1. Blower aeration device (1) micro-bubble aerator (2) bubble aerator (3) hydraulic shear air aerator (4) hydraulic impact air aerator 〖You are browsing the article by the first ＇fanwen net www.diYifanwen.com整理, the copyright belongs to the original author, the original source all. 2. mechanical aerator (1) vertical shaft mechanical aerator (2) horizontal shaft mechanical aerator 3. activated sludge method of the main operating modes (1) push-flow activated sludge method (2) complete mixing of activated sludge method (3) segmented aeration activated sludge method (4) adsorption - regeneration of activated sludge (5) delayed aeration of activated sludge method (6) high activated sludge method (7) shallow aeration, deep-water aeration, deep-well aeration activated sludge method (8) aeration of activated sludge method (9) deep-well aeration, deep-water aeration, deep-well aeration, deep-well aeration, deep-well aeration, deep-well aeration activated sludge method (8) Pure oxygen aeration activated sludge method (9) Oxidation ditch process (10) Sequential batch activated sludge method The traditional aerobic activated sludge method for industrial wastewater treatment is a method that is economic, purification effect is good, the disadvantage is that the concentration of pollutants in the wastewater will be changed, in particular some of the pollutants that have an inhibitory effect on the bacterial activity of the inhibition of the effect is obvious. On the basis of traditional method, domesticated aerobic activated sludge, domesticated activated sludge can resist the inhibition of high concentration of pollutants, for example, with domesticated mixed bacteria can be continuously degraded toxic organic chlorides, effectively improving the purification effect. In addition, the sludge generation of the traditional activated sludge method is relatively large, which is also a relatively large disadvantage of the traditional activated sludge method. The process flow diagram of the West District General Plant is as follows:
The following figure is the aerial view of the West District General Plant:
3. Design parameters of the West District General Plant: ◎Treatment scale: the total design scale is 90,000 tons/day, and the first phase design scale is 30,000 tons/day at present. ◎ The main process used: traditional activated sludge method based on impeller surface aeration. Design water quality: COD≤500mg/LSS≤250mg/LBOD5≤200mg/L ◎ Design effluent water quality: COD≤120mg/LSS≤30mg/LBOD5≤30mg/L The plant implements the "Guangdong Province, local standards for water pollutants discharge limits" (DB44/26-2001), the effluent water quality standards for COD≤60mg/LSS≤30mg/L. The plant also implements the "Guangdong Province, local standards for water pollutants discharge limits" (DB44/26-2001), the effluent water quality standards for COD≤60mg/LSS≤30mg/L. The plant is designed to treat 30,000 tons/day. 60mg/LSS≤30mg/LBOD5≤30mg/L
The actual treatment situation at present (the average daily treatment of 24,000 tons of water, of which more than 70% is industrial wastewater.) Item
Inlet water (mg/L)
Outlet water (mg/L)
Treatment efficiency (%) COD
544
48.1
91.2 BOD5
270
9.8
96.4 SS
278
28.7
89.7 Main structures: No.
Structure name
Structure type
Specification (L×B×H, m)
Effective volume (m3)
Quantity 1
Aeration sedimentation basin
Aeration sedimentation basin
13.5×2.5×3.78 × 2.5 × 3.78
109
1 2
First Sedimentation Tank
Radial Flow Sedimentation Tank
D=20, H=5.65
1104
2 3
Aeration Tank
Surface Aerated Bio-chemical Tank
12×12×4.5
648
10 4
Dual Sedimentation Tank
Radial Flow Sedimentation Tank
D=34, H=4.15
3282
2 5
Thickener
Gravity Concentration Tank
D=9, H=8.6
365 <
2 Main equipment Equipment name
Model specification
Manufacturer
Quantity
Remarks Grid cleaner
XGS1350-1200
Tangshan Qingyuan Environmental Protection Co.
1
Grid spacing of 10mm, pitch of 100mm Sand and Water Separator
LSSF-260B
Nanjing Lanshen Pump Group
1 Primary Sinking Tank Scraper
D20
Jiangdu Water Supply and Drainage Equipment Manufacturing Factory
2
Single-arm peripheral drive swath scraper Primary Sink Mud Discharge Pump
AS55-4CB
Nanjing Lanshen Pump Group
2 Aerator
PE150
Anhui No.1 Textile Machinery Factory
10
SIEMENS Frequency Converter Stepless Speed Control Sludge Return Pump
WQ-300-15
Nanjing Lanshen Pump Group
4 Dual Sinking Tank Scraper and Suction Mud Machine
D34
Jiangdu Water Supply and Drainage Equipment Manufacturing Factory
2
Double-arm peripheral drive amplitude flow scraper suction mud machine Belt Filter Press
DYL-2000
Henan Chengcheng Environmental Protection Plant
2
POWTRAN-RICH Frequency inverter stepless adjustment of the speed of the belt Roots blower
SSR-100
SHANDONG ZHANGHOU MACHINERY INDUSTRY CO.,LTD
2
SIEMENS Frequency inverter stepless speed adjustment Residual sludge pump
AS75-4CB
Nanjing Lanshen Pump Group
2 Filter belt washing pump
IS65-40-250
Hubei Shishou Water Pump Plant
Hubei Shishou Water Pump Factory
2 Sludge Transfer Pump
80WJ4012
Shanghai Ligong Pump Industry Co.
2
Chemical corrosion-resistant pumps, SIEMENS Frequency Converter Stepless Speed Regulation Dosing Metering Pump
JD
Tianjin General Machinery Factory
2 Air Compressor
V-0.3/10
Guangzhou Tianhe Overseas Chinese Enterprise Company Huatong Compressor Factory
1
Mobile Air Compressor Chlorine Dioxide Sterilizer
HT908-500
Shenzhen OuTaiHua Co. p>
BOD5
MLSS of mixed liquor of aeration tank
MLSS of return sludge
SSuspended SS PH value
Total nitrogen TN
SV of 30-minute settlement ratio
SVI of sludge index
Ammoniacal nitrogen NH3-N Total phosphorus TP
Phosphate PO43--P
Water content
Organic matter
Chloride (II) East District Wastewater Treatment Plant Overview: Time of visit: the morning of November 28, 2004 1. Plant Overview : East District Wastewater Treatment Plant is located in the Guangzhou Economic and Technological Development Zone East District (Export Processing Zone), Hongguang Road, Guangzhou Economic and Technological Development Zone Management Committee to use the Austrian International The plant was built by the Guangzhou Economic and Technological Development Zone Management Committee with international payments from Austria. The first phase of the design scale of 26,000 tons / day, to deal with industrial and domestic sewage in the East District, using the SBR process, basically using imported equipment, sewage into the plant in a self-flowing manner.