Dongguan Dongjiang Water Co., Ltd. Urban Sewage Treatment Plant (including harmless treatment station of urban excrement)
Located in Zhou Wang, shigu village, Chengnan District, it covers an area of 16.2 1 10,000 square meters, with a daily treatment capacity of 200,000 tons of domestic sewage and 0/50 tons of feces. It is the largest domestic sewage treatment plant in Dongguan at present, and it is also the only harmless manure treatment station. There are two sewage pumping stations outside the factory, namely Xinji sewage pumping station and Shanzhouhe sewage pumping station. It is a wholly-owned state-owned enterprise. Collection scope of sewage and feces: Guancheng District, Chengnan District and Dongcheng District, sewage in life in south, Wanjiang District and feces in four districts. The service area is 62.95 square kilometers, and the service area is 499,600 people.
The total investment of the plant is estimated to be 600 million yuan, including 200 million yuan for workshop and 400 million yuan for pipe network. Both the factory building and the pipe network were invested by Dongguan finance and completed in two phases. The first phase of the project started in September 2006 and was put into trial operation in June 2002. Anaerobic-oxidation ditch process (A/O process) is adopted, and the treatment capacity is 654.38+10,000 tons/day. The second phase of the project started in September 2003 and was put into trial operation on August 28, 2004. The anoxic and anaerobic oxidation ditch process (A2/O process) is adopted, and the treatment capacity is 654.38 million tons/day. Total length of sewage interception main pipe 14.77Km, pipe diameter D 1400mm to d2600mm; The total length of the branch is 4.9Km, and the pipe diameter ranges from D 300mm to d1600 mm. ..
The sewage treated by this factory has been sampled and tested by the municipal environmental monitoring station, and it meets the national (GB 189 18-2002) first-class B standard and Guangdong (DB 4426-200 1) first-class standard.
Legal Representative/Person in Charge: Wang Jianwei.
Telephone number (fax): 29826 17.
Postal code: 523000
Address: Zhou Wang, shigu village, Chengnan District.
Established: 2002- 12-3 1
Guangzhou Datansha Sewage Treatment Plant
Guangzhou Datansha Sewage Treatment Plant is the first large-scale urban sewage treatment plant in Guangzhou, with a treatment scale of10.5 million m3/d, an area of10.4 ha, a total investment of10.40 billion yuan, a service scope of10.289 ha and a service population of about 600,000. The project was jointly designed by Guangzhou Municipal Engineering Design and Research Institute and china municipal engineering Huabei Design and Research Institute. Won the first prize of Guangzhou Environmental Protection Research and Design, the second prize of Guangdong Excellent Design and the third prize of Ministry of Construction Excellent Design.
The sewage treatment process adopts biological phosphorus and nitrogen removal activated sludge process (A2/O for short), which was fully completed and put into operation at the end of19891/kloc-0. After years of operation, it is proved that the treated effluent completely meets the design requirements, obviously improves the water quality of the Pearl River near the plant area, and achieves remarkable social and environmental benefits.
The project includes: (1) sewage pumping station, 6 pumps (5 in use 1 standby) of sewage pumping station in Aokou, with a total pumping capacity of 96,000 m3/d, pumping the sewage from Simayong District to Datansha Sewage Treatment Plant for treatment; Liwan Pumping Station is equipped with 4 pumps (3 for use/kloc-0 for standby) with a total pumping capacity of 57,600 m3/d, which will pump the sewage from Liwan Chung to Datansha Sewage Treatment Plant for treatment. (2) The sewage treatment plant is located on the small island of Datansha in the western suburbs of Guangzhou, covering an area of 200 mu. Sewage pumped by Liwan Pumping Station and Aokou Pumping Station is transported to the factory through pressure pipelines.
Sewage treatment in the factory area is divided into primary treatment and secondary treatment. The primary treatment includes grit chamber and primary sedimentation tank to remove larger particles of organic matter; The secondary treatment adopts biological phosphorus and nitrogen removal activated sludge method, which consists of biological reaction tank, secondary sedimentation tank and contact disinfection tank. In anaerobic, anoxic and aerobic environments, the purpose of removing organic matter, nitrogen and phosphorus from sewage is achieved through the biochemical action of different kinds of microorganisms. The sludge treatment plant reserves land for sludge digestion. However, considering the low content of organic matter in Guangzhou municipal sewage, raw sludge direct dehydration process was adopted, which consisted of sludge concentration tank, sludge storage tank and sludge dewatering machine room. After concentration and mechanical dehydration, the water content of sludge produced during sewage treatment can be reduced from about 98% to 75% ~ 80%, and then transported to sanitary landfill for sanitary landfill treatment with garbage.
Engineering features: (1) In view of the serious pollution of nitrogen and phosphorus in the west channel of Guangzhou reach of the Pearl River (near the water source of Xicun Water Plant), the internationally advanced phosphorus and nitrogen removal process was selected for the first time in China. (2) Design and select advanced equipment at home and abroad, such as microporous aerator, submersible pump, underwater agitator, sludge dehydrator, etc., to reduce the energy consumption of treatment. (3) There is no leakage or cracking after building a large pool in limestone area with complex karst caves. (4) The automation degree is high, and the equipment is controlled according to the program, which is recorded and controlled by the computer in the central control room. The monitoring contents include pH, SS, MLSS, temperature, mud level, dissolved oxygen and redox potential. (5) The general layout of the treatment plant is reasonable and compact, with a high degree of greening and elegant environment, which is well received by domestic and foreign counterparts.
Area code: 020
Tel: 020-8 1754527
Address: Tan Wei Street, Shuangqiao Road
Guangzhou xilang sewage treatment co., ltd
Xilang Sewage Treatment Plant (Phase I) covers an area of 1 13033m2, with a building area of 17058m2 and a designed treatment capacity of 200,000m3/d. The improved A2O process has good phosphorus and nitrogen removal functions. After the project is put into production, it will effectively collect and treat all the sewage in Fangcun District and part of the sewage in Haizhu District, improve the water body in Guangzhou section of the Pearl River, protect the water quality of the water intake points of Xicun Waterworks, Shimen Waterworks, Zhou Xiao Waterworks and Xishi Waterworks in Guangzhou, and optimize the investment environment, thus improving the quality of life of Guangzhou people and generating good environmental, social and economic benefits.
Guangzhou Li Jiao Sewage Treatment Plant
The factory will be built in stages. The first phase of the project 199 1 project, 1999 was officially put into production, with a design capacity of 220,000 tons/day. The second phase of the project started in April 2002 and was put into trial operation in June 2003 at 5438+ 10, with a design capacity of 220,000 tons/day. Liede Phase III started construction in 2004 and was put into trial operation on September 26th, 2006, with a design capacity of 200,000 tons/day. The first phase of our plant adopts AB two-stage adsorption and degradation biological treatment process, the second phase adopts combined alternating activated sludge process and the third phase adopts improved A2/O process (anoxic/anaerobic/aerobic activated sludge process). There are four sewage lifting pumping stations outside the factory, namely Donghaoyong, Xihaoyong, Tianhe South Road and He Lin East Road, among which Donghaoyong Pumping Station is also responsible for flood control and drainage in the central city. The main structures in the plant include: lifting pump house, grit chamber, biological reaction tank, secondary sedimentation tank, concentration tank, dewatering machine room and contact tank. After the sewage is transported from the off-site pumping station to the factory, it passes through the thick and thin grid of the lifting pump house in the factory to remove the larger suspended solids and floating objects in the sewage; Then it is lifted by centrifugal submersible pump to the elevated canal box in the factory area and flows into the grit chamber; The desanding sewage enters the first and second biological reaction tanks for treatment, and then reaches the standard after secondary precipitation and disinfection.
At present, the factory has established a scientific management system of "quality, environment, occupational health and safety", standardized production safety, and ensured the completion of water treatment tasks and the stable discharge of effluent quality. Since Liede Sewage Treatment Plant was put into operation, the water quality of Guangzhou section of the Pearl River has been obviously improved. As of February 5, 2006, statistics show that the total amount of sewage treatment in Liede Plant this year has reached1.651.200 million tons, and the annual production task of 1.64477 million tons was successfully completed 25 days ahead of schedule, and all the treated effluent reached or exceeded the national first-class B standard.
Guangzhou Liede Sewage Treatment Plant
Guangzhou Liede Sewage Treatment Plant is the second large-scale modern urban sewage treatment plant in Guangzhou sewage treatment planning. Located in the east of Liede Village, Tianhe District, Guangzhou, and on the north bank of the Pearl River of South China Bridge, it covers an area of 390,000 square meters. It is mainly responsible for collecting and treating most of the sewage in the central city north of the Pearl River, including Xihaoyong, drainage system along the river, Donghaoyong, Ersha Island and Tianhe District, with a service area of 150 square kilometers.
The factory will be built in stages. The first phase of the project 199 1 project, 1999 was officially put into production, with a design capacity of 220,000 tons/day. The second phase of the project started in April 2002 and was put into trial operation in June 2003 at 5438+ 10, with a design capacity of 220,000 tons/day. Liede Phase III started construction in 2004 and was put into trial operation on September 26th, 2006, with a design capacity of 200,000 tons/day. The first phase of our plant adopts AB two-stage adsorption and degradation biological treatment process, the second phase adopts combined alternating activated sludge process and the third phase adopts improved A2/O process (anoxic/anaerobic/aerobic activated sludge process). There are four sewage lifting pumping stations outside the factory, namely Donghaoyong, Xihaoyong, Tianhe South Road and He Lin East Road, among which Donghaoyong Pumping Station is also responsible for flood control and drainage in the central city. The main structures in the plant include: lifting pump house, grit chamber, biological reaction tank, secondary sedimentation tank, concentration tank, dewatering machine room and contact tank. After the sewage is transported from the off-site pumping station to the factory, it passes through the thick and thin grid of the lifting pump house in the factory to remove the larger suspended solids and floating objects in the sewage; Then it is lifted by centrifugal submersible pump to the elevated canal box in the factory area and flows into the grit chamber; The sewage after desanding treatment enters the first and second biological reaction tanks for treatment, and then reaches the standard after secondary precipitation and disinfection.
Company: Zhou Manqi
Number of employees: 150.
Address: No.501,Linjiang Avenue, Tianhe District, Guangzhou, Guangdong.
Postal code: 5 10655
Tel: 020-38890399
Company fax: 38890803
Guangzhou Panyu district qianfeng water purification plant
Qianfeng Water Purification Plant is located in Qianfeng Village, Shiji Town, Panyu District, with a total area of 300 mu and a planned sewage treatment scale of 40 tons/day. The construction will be carried out in four phases, the first phase is 654.38+10,000 tons/day, the second phase is 654.38+10,000 tons/day, and the construction land with the processing capacity of 654.38+10,000 tons/day will be reserved for the third and fourth phases. Approved by Guangzhou Planning Commission, the project started construction in March, 20001year. The total investment of the first phase project is expected to be 420 million yuan, including 200 million yuan for the factory project (82 million yuan for the national debt) and 220 million yuan for the supporting sewage interception project.
The factory project consists of lifting pump house, fine grid and grit chamber, UNITANK reaction tank, contact disinfection tank, mud storage tank, sewage concentrated glue machine room, blower room, transformer room and comprehensive office building. The off-site sewage interception project covers Shiqiao, Shijie and Shawan Town, with a length of 52 kilometers, 8 sewage interception trunk pipes and 4 lifting pumping stations.
UNITANK of Scotts Company in Belgium was introduced into the project. Patented technology, using combined alternating A/O activated sludge treatment process, has the function of removing phosphorus and ammonia nitrogen, and can also disinfect the discharged sewage. The effluent quality should meet the national comprehensive wastewater discharge standard and the first-class discharge standard of Guangzhou wastewater discharge standard. The main discharge indicators are (unit: mg/L): BOD5 ≤ 20, CODcr≤60, SS≤20, NH4-N≤ 10.
The engineering design is undertaken by Guangzhou Design and Research Institute; Project supervision, equipment procurement and installation, and civil construction adopt public bidding to select contractors. Hubei Zhongnan Municipal Engineering Supervision Company won the bid to be responsible for civil construction and equipment installation supervision, Guangdong Sijian, Guangzhou Sijian, Guangjian Group and other units undertook civil construction, and Shenzhen Zhongxing New Equipment Communication Company and China General Machinery Corporation contracted equipment procurement, installation and commissioning. The main processing equipment and key technologies are imported from abroad, and the general equipment is made in China.
The operation and management of the project are carried out in a socialized, market-oriented and professional mode. Operators were selected through international public bidding, which attracted French Vivendi Water Company and other domestic and foreign units to participate in the bidding. In the end, Shenzhen Water (Group) Co., Ltd. won the bid, and was responsible for the operation and maintenance of the factory and the pipe network, with a contract period of five years.
At present, the civil works and equipment installation of the first phase of 654.38+10,000 tons/day have been basically completed, and the equipment debugging and trial operation will be carried out soon. It is estimated that after the second quarter of 2004 is put into full operation, most of the domestic sewage in Shiqiao central city, Shijie, Shilou and Shawan town central city can be treated, and the regional environmental quality will be obviously improved.
Legal person: Liang and Zhu
Main business: sewage purification
Tel: 846 1 1726
Address: Qianfeng Village, Shiji Town, Panyu District, Guangzhou, Guangdong
Economic type: State-owned enterprises
Production output value: 3-5 million.
Number of personnel: 22
Opening year: 1999
Guangzhou Economic and Technological Development Zone Sewage Treatment Plant East Zone Factory
Guangzhou Economic and Technological Development Zone East District Sewage Treatment Plant (now renamed East District Water Purification Plant) is a project built with the loan of Austrian government. The total investment of the project is estimated to be 82 million yuan, and the actual investment is about 70 million yuan, of which 490 dollars is borrowed from the Austrian government. The project broke ground in February 2002 and was completed and accepted in May 2003. Won the title of safety and civilized construction model site in Guangzhou.
I. Scope of services and emission standards
The service scope of the East District Sewage Treatment Plant is the East District of Guangzhou Economic and Technological Development Zone, with a service area of 7 square kilometers. The Eastern District Sewage Treatment Plant covers a small area, and its site is located on a triangular plot south of Hongguang Road and west of Nangang River in the Eastern District, with a total area of about 35,000 square meters. The first phase of the project covers an area of 6,543,800 square meters.
At present, the drainage system in the East District is divided into two systems, rainwater and sewage are discharged separately. The main sources of sewage are the production wastewater discharged by electronics, food, steel and auto parts manufacturing enterprises in the area and the domestic sewage discharged by residents in the living area. The designed treatment capacity of the East District Sewage Treatment Plant is 90,000 M3/ day, of which the designed treatment capacity of the first phase is 25,000 M3/ day, and the first-class discharge standard of the National Integrated Wastewater Discharge Standard (GB8978- 1996) is implemented. The designed inlet and outlet water quality is:
Design inlet water quality and design outlet water quality of main pollutants
BOD5 200mg mg/L ≤ 20mg/L.
CODcr 400 mg/l ≤60 mg/l
SS 250/L ≤ 20mg/L.
NH3-N 25mg/L ≤15mg/L.
Po43-5mg/L ≤ 0.5mg/L
Second, the processing flow and flow
According to the specific situation of the East District Sewage Treatment Plant and the principle of "advanced technology, economic rationality, high efficiency and energy saving, simplicity and practicality, and land saving", the treatment process of the East District Sewage Treatment Plant is determined as intermittent activated sludge process.
The mechanism of intermittent activated sludge process is that in the traditional activated sludge process, different biological conditions are generated in different ponds, and different biological environments are created at different times, so that the biochemical treatment stage of sewage becomes the same biological pond, so that the biochemical treatment process of sewage is completed in the same space at different times.
The intermittent activated sludge process forms a cycle through four stages: water inflow, aeration, sedimentation and skimming, and the time is about 4~6 hours. Sewage is subjected to phosphorus and nitrogen removal in repeated anaerobic, anoxic and aerobic environments.
In this process, aeration of the biological pool through the aeration head can greatly improve the oxygen supply efficiency, increase the water depth of the biological pool and reduce the occupied area. At the same time, because the biological pool is a completely mixed biological pool, the sedimentation tank can be omitted. Usually, the secondary sedimentation tank and reflux pump room in other processes are also omitted in this process, so the treatment process is greatly reduced.
Three. Main economic and technical indicators
Unit indicator of serial number item
1 year, the total cost is ten thousand yuan 1036.33.
Two-year operating cost 10000 yuan, 575.66 yuan.
3 unit production cost /m3 1. 14
4 The unit operating cost is 0.63 yuan /m3.
The five-year electricity bill is 65,438+076.34 yuan.
6. The power consumption per unit water quantity is Kw.h/m3 0. 19.
7 unit water investment yuan /m3 2800
8. The total investment of the project is 10000 yuan and 7000 yuan.
In which: foreign loan10,000,490 USD.
10 domestic matching fund10,000.00 yuan, 2800.00 yuan.
Fourth, the engineering characteristics
1, advanced equipment. The East District Sewage Treatment Plant is a project built with loans from the Austrian government. The main equipment of the factory is selected through international bidding, with internationally renowned brands and the most advanced models. Equipment suppliers include Siemens, ABB, Nech, Andritz, Joyo, KSB, AGRE, Spirac, Heideco, Huber, Burbach, Technofluid, Nopol, E+H, Compaq, Hach, WTW, Sartorius, Zeiss, etc.
2. High degree of automation. The automatic control system adopts the most advanced profibus bus control and remote three-level control. The online monitoring of turbidity, PH value, dissolved oxygen, liquid level and flow rate of inlet and outlet water is realized, and 24-hour automatic sampler is equipped at the inlet and outlet. Wonderware InTouch 7.0, an application software with 32-bit object-oriented graphical man-machine interface based on Microsoft Windows, and full-automatic recording system ACRON are selected for the central control room. The semi-automatic or full-automatic control process production line can be selected through the man-machine interface, and the process can be scheduled by modifying the set values of process parameters in the computer to ensure the effluent quality. Infrared dual monitoring system is installed in the factory boundary and office area, and camera monitoring is installed in the production workshop. The situation of the production line can be observed at any time in the central control room, which changes the tradition that the sewage treatment plant needs a large number of workers and greatly reduces the operating cost. Moreover, the automatic recording system provides traceability of production conditions, which provides favorable conditions for the statistics of inlet water quality data and the summary of operation experience.
3. Closed production workshop. Dongqu Sewage Treatment Plant is the earliest sewage treatment plant with steel roof in China, which not only minimizes the impact on the surrounding environment, but also makes the sewage plant look like a modern factory.
Shaoguan No.1 Sewage Treatment Plant
This project is one of the blue sky and clear water projects in Guangdong Province. The project was carried out in strict accordance with the procedures of the Bidding Law of People's Republic of China (PRC), and the expert judges determined that the city valve machinery Co., Ltd. was the winning bidder and was the general contractor for the survey, design, civil engineering, equipment installation, trial operation and personnel training of the project. The project covers an area of about 2 hectares and the controlled land is about 7 hectares. The construction scale of the first phase is daily sewage treatment10.5 million cubic meters, and the construction scale of the second phase is increased to 30,000 cubic meters, which is designed by Guangzhou Municipal Design and Research Institute. Advanced and mature biochemical (activated sludge process) process is adopted for sewage treatment. The construction of this project has far-reaching significance for protecting and improving the drinking water sources of Xihe No.2 Water Plant, Shiliting Water Plant and Wu Liting Water Plant, improving the urban environmental quality and optimizing the investment environment.
Binhe Sewage Treatment Plant of Shenzhen Water Group Co., Ltd.
The project is located in Binhe Sewage Treatment Plant, No.2 Courtyard, Binhe Avenue, Futian District, Shenzhen City, Guangdong Province, covering an area of 13.87 hectares. The service scope is in the west of Luohu District and east of Futian District, serving about 540,000 people and treating 300,000 tons of sewage every day.
The total investment of the project is 450 million yuan.
The second-stage sewage treatment system of Shenzhen Binhe Sewage Treatment Plant by activated sludge method was completed in 1987. The system mainly treats domestic sewage in Luohu District and Futian District of Shenzhen, with a daily treatment capacity of 25,000m3. After more than ten years of operation, according to the characteristics of existing equipment, a set of sewage treatment methods suitable for Shenzhen's sewage quality characteristics are gradually explored. On the basis of summing up practical experience and combining with the latest development trend of sewage treatment technology, the best way to transform old equipment and structures is actively explored.
1 design process
Design parameters of activated sludge process;
Intake water quality: BOD5=200mg/L, SS = 240mg/L;
The effluent requirements meet the national secondary treatment discharge requirements, that is, pH=6.5-8.5, SS < 30 mg/L, BOD5 < 30mg/L and CODcr <120mg/L..
See figure 1 for the process flow.
Figure 1 Process Flow Diagram of Binhe Sewage Treatment Plant
(1) The grid spacing of the mechanical grid with coarse grid is 20mm.
(2) The front end of the aerated grit chamber is provided with a fine grid with a spacing of 10 mm ... The grit chamber was originally designed as a Dole grit chamber, and the water-sand mixture was sucked into the separation chamber by a sand pump for water-sand separation. Later, because the actual operation effect was not ideal, the reform was carried out in the form of advection chamber, and the mechanical sand scraper was used for sand cleaning.
(3) The primary sedimentation tank is two circular radial sedimentation tanks with a diameter of 25m, a water depth of 3. 14m and a sedimentation time of1.5h. It is designed to remove 60% of suspended solids and 25% ~ 30% of BOD5 load.
(4) The aeration tank is divided into two groups, each group has four corridors, and the two groups of tanks are used in parallel. The total effective volume is 8350m3, and the water depth is 6m. The hydraulic retention time is 8h, and the sludge load is 0.2kgBOD5/(kgMLSS? D) test.
(5) The secondary sedimentation tank is two circular radial sedimentation tanks with a diameter of 30m, with a water depth of 3.97m and a sedimentation time of 2.5h.
(6) Three 700mm spiral reflux pumps are used for activated sludge reflux in the secondary sedimentation tank of the sludge reflux pump station, and the reflux rate is 85%, so there is no standby.
(7) Dehydrator Belt Dehydrator is used for sludge dehydration, which has stable performance and high working efficiency, but the sanitary conditions are poor.
2 purification mechanism and process characteristics
As a traditional biological sewage treatment process, ordinary activated sludge process is a sewage treatment method with high treatment efficiency. Microorganisms in activated sludge mainly include bacteria, protozoa and algae, among which bacteria mainly exist in the state of micelles and filamentous bacteria. In the traditional activated sludge process, cultivating a certain concentration of activated sludge with good settling performance is the key to the operation and the key to ensure the quality of effluent.
3 Inlet water quality
The influent quality of Shenzhen Binhe Sewage Treatment Plant fluctuated greatly, with the highest influent BOD5 concentration of 450 mg/L and the lowest BOD5 concentration of 80 mg/L. The frequency of influent BOD5 concentration between100 mg/L and 200 mg/L was 54%, and that between 200 mg/L and 300 mg/L was 26.5%. The average influent BOD5 concentration is190 mg/l/l. The frequency of influent SS concentration between 120 mg/L and 240 mg/L is 76%, the frequency of influent SS concentration greater than 240mg/L is 24%, and the average influent SS concentration is146mg/L. The maximum influent CODCr concentration is 2000mg/L, the minimum influent CODCr concentration is 200 mg/L, and the average influent CODCr ... The main component of influent suspended solids is sludge.
4 Operation situation
Shenzhen has a subtropical maritime climate, with an annual average temperature of 23℃, a monthly average maximum temperature of 28℃ in summer and a monthly average minimum temperature of 15℃ in winter. The temperature difference between the four seasons is small, and the temperature of urban sewage is suitable for microbial reproduction.
The influent of Binhe Sewage Treatment Plant is mainly domestic sewage, with only a small amount of industrial wastewater, and the influent BOD5/ CODCr is greater than 0.3, so the biochemical process of sewage is easy to carry out. The abnormal change of influent CODCr can reflect the abnormal change of influent BOD5.
The influent of Binhe sewage treatment plant often contains floating objects, silt and building sand. The operation mode of the sand pump used in the original design of Dule grit chamber is not suitable, the sand pump is often blocked, the detention time of Dule grit chamber is too long, the silt content of the sand is too large, and the sand-water separator used in the original design is not dehydrated well, which makes the production and operation difficult.
Then, according to the actual influent quality, the Dor grit chamber was reformed according to the principle of advection tank, the height of outlet weir plate was reduced, aeration pipes were added, and the simple and efficient mechanical sand scraping method was adopted, which solved the difficulty of sand-water separation and reduced sludge sedimentation.
After one precipitation, the removal rates of SS, BOD5 and CODCr reached 56.2%, 45.8% and 565,438 0.2% respectively. The average concentrations of SS, BOD5 and CODCr in the effluent of the primary sedimentation tank are 64mg/L, 103mg/L and 185.3mg/L respectively. Because of the high content of suspended sludge in influent, the removal rate of suspended organic matter by primary precipitation is higher than the design value. Because some influent water quality exceeds the design standard, the frequency of SS concentration in the effluent of the primary sedimentation tank exceeds the design value is 8.4%. The frequency of effluent BOD5 concentration exceeding the design value is 13.4%, which forms an impact load on the aeration tank.
The properties of activated sludge in aeration tank directly affect the effluent quality, and the composition of activated sludge includes both bacterial micelle and filamentous bacteria. The growth of activated sludge is determined by nutrients, water temperature, pH value and other factors. Activated sludge concentration is an internal factor affecting sludge load.
Sludge load N(kgBOD5/(kg MLSS? D)) Relationship with sludge concentration MLSS:
N=QLa/(XV)
Where q- sewage flow, m3/d;
La—— BOD5 concentration in influent of aeration tank, mg/l;
X—— sludge concentration in MLSS mixed liquor of aeration tank, mg/l;
V—— volume of aeration tank, m3.
The activated sludge concentration in the aeration tank of Binhe Sewage Treatment Plant is maintained at about 1000mg/L, and the average sludge load in the aeration tank is 0.3 1kg BOD5/(kg MLSS? D), greater than the design value.
The sedimentation performance of activated sludge is an important factor affecting the effluent quality of secondary sedimentation tank. Controlling the sedimentation ratio of activated sludge at a reasonable level depends on the influent quality such as pH, nutrients, water temperature and the design parameters of the secondary sedimentation tank. The monitoring results show that when the sludge sedimentation ratio SV of aeration tank is less than 40%, the activated sludge settles well in the secondary sedimentation tank. When the concentration of activated sludge in the aeration tank is lower than 900mg/L, filamentous bacteria have the opportunity to multiply in large quantities. Filamentous bacteria have strong ability to decompose organic matter. When bacterial micelles are dominant, the increase of filamentous bacteria has even stronger degradation effect on organic matter than activated sludge, but the separation ability of sludge and water is poor, which has a great impact on the effluent SS of the secondary sedimentation tank. When the concentration of activated sludge in aeration tank is lower than 800mg/L, filamentous bacteria will cause serious sludge bulking. In actual production, sludge bulking can be prevented by taking the sludge sedimentation ratio of 40% as a reference value and combining with microbial microscopic examination. Low concentration activated sludge process is more likely to cause sludge bulking than high concentration activated sludge process.
5 sewage quality
The activated sludge system of Shenzhen Binhe Sewage Treatment Plant can efficiently remove organic matter and suspended matter, and the removal rate of BOD5 and SS can reach over 90%. The effluent BOD5 and SS meet the national secondary treatment discharge standard, which is lower than 30 mg/L; The removal rate of CODCr can reach more than 80%, the effluent CODCr is less than 120 mg/L, the average effluent CODCr is 32.88 mg/L, and the frequency of effluent CODCr concentration below 60mg/L is 89.2%.
6 Operation management
During the operation of traditional activated sludge wastewater treatment system, the influent quality often changes and fluctuates greatly. In order to maintain the stable operation of aeration tank, it is the key to adjust the operation parameters in time with the change of influent quality. Through long-term operation practice and regular research on water quality analysis results, we draw the following conclusions:
When the effluent BOD5 and SS are more than 20mg/L or the sedimentation ratio of activated sludge in the aeration tank is more than 40%, the sludge reflux ratio needs to be adjusted in time in the operation section to maintain the normal performance of activated sludge.
There is a trend correlation between effluent CODCr and effluent SS and BOD5, but the determination of CODCr and SS is faster, and BOD5 is slower. When the effluent CODCr is greater than 60mg/L, the sludge reflux ratio should be adjusted appropriately to increase the concentration of activated sludge in the aeration tank, so as to maintain the removal effect of organic matter and maintain stable operation.
7 abstract
The traditional activated sludge process is a low-cost and high-efficiency sewage treatment method, which can effectively remove organic matter. Activated sludge process with long residence time also has nitrification function, but the traditional activated sludge process is easy to cause sludge bulking in operation, and its impact load resistance is poor when it is operated at low activated sludge concentration. In the Pearl River Delta region, the traditional activated sludge process is transformed into A/O process or oxidation ditch is used for sewage treatment, which makes the operation more stable, enhances the ability of resisting impact load and sludge bulking, and is easy to realize automatic management.
Address: Room 6 10, Yard 2, Binhe Avenue, Shenzhen, Guangdong.
Postal code: 5 1803 1
Nanshan Sewage Treatment Plant of Shenzhen Water Group Co., Ltd.
Nanshan Sewage Treatment Plant is subordinate to the Municipal Drainage Management Office and located in Moon Bay, Nantou, which is an important part of Shenzhen sewage discharge project. Shenzhen Water Supply and Drainage Engineering Construction Headquarters is responsible for the construction, designed by Nanchang Nonferrous Metallurgy Design and Research Institute, and constructed by Shenzhen Municipal Engineering Company. March 1988 started construction, and1October1kloc-0/989 was completed and put into production. The first phase of the project has a scale of 50,000 yuan and an investment of 45 million yuan. Its service scope covers Nantou, Nanyou and parts of Shekou, serving 85,000 people. The second phase of the project started on1989 65438+February.1June 25th, 997, the marine discharge pipe and the sludge in the factory area were partially completed and put into use. After the completion of all the projects, the service population is 1, 2 1, 680, and the sewage treatment capacity is 736,000m3/d; Covering area 15.4438+06 hectares.
Shenzhen sewage discharge project is to transport the urban sewage west of Huanggang Road in Futian District to Nanshan Sewage Treatment Plant through the intercepting pipe (canal) system, and after preliminary treatment, it is pressurized by a water pump and sent to Mawan, and then enters the ocean discharge pipe through the working well, and then uniformly discharges the sewage to the deep sea of the Pearl River Estuary through the diffuser, so as to meet the environmental protection requirements by utilizing the huge dilution and self-purification ability of seawater. This project includes the sewage interception trunk pipe (canal) from Huanggang Road to the sewage outlet, with a length of 32.04 kilometers. Six sewage pumping stations will be built in Binhe, Xinzhou, Feng Tang, Houhai, Qianhai and Deng Liang. Nanshan Sewage Treatment Plant; One marine discharge pipe, length1609m. The designed service population of Shenzhen sewage discharge project is 12 16800 (including permanent population and temporary population 10 1400 and floating population of 202,800). The total amount of sewage discharged is 73.6m3/ day (the discharge quota is 650 l/ person/day for permanent population and temporary population, and 366 for floating population).
Treatment technology of Nanshan sewage treatment plant
Sewage is intercepted by the grid of the main lifting pump house, lifted by submersible pump, and enters the aerated grit chamber through the fine grid.
Address: No.0/6, Moon Bay Avenue, Nanshan District, Shenzhen.
Tel: 0755-26489894