Baoji City is distributed in a belt along Weihe River, which is the main sewage receiver in Baoji City. In recent years, the water quality of Weihe River has been seriously polluted, and the groundwater resources on both sides of the river have also been violated to varying degrees. A sewage treatment plant with a daily sewage treatment capacity of 654.38+200,000 m3 will be built in Shilipu, the lower reaches of Weihe River, which will solve the sewage treatment problems in Fu Lin Fort, Baliqiao, downtown, Shangmaying and Shilipu. The service area of the newly-built sewage treatment plant is 19.5km2, accounting for 50% of the total urban area, and the existing population of the service area is about 350,000, accounting for 60% of the total urban population.
The feasibility study report of the construction project of Baoji Shilipu Sewage Treatment Plant was approved by the Provincial Planning Commission (Shantou (20065438+0) No.275), and the preliminary design of the project was approved by Shantou (20065438+0) No.907. The urban construction bureau of Baoji City is responsible for the project, and the preparatory office of Baoji Shilipu Sewage Treatment Plant is responsible for the construction. The total investment of the approved budget for the preliminary design of the project is 654.38+0.43 billion yuan. The sources of funds are government bonds, loans and self-financing. The design scale is 65438+200,000 m 3 sewage/day, of which 90,000 m3 is treated in the first phase. The second phase is expanded to 65,438+200,000 m3/ day, and the project covers an area of 89.9 mu. The project adopts the advanced and improved SBR secondary biochemical sewage treatment process, and the treated sewage reaches the first-class discharge standard, in which 1000 m3 is further treated every day, reaching the reuse standard. The project started in September 2002, with a planned construction period of two years, and is expected to be completed ahead of schedule in June 2004.
Shilipu Sewage Treatment Plant is progressing smoothly. Up to now, the civil works of SBR biological tanks I #, II # and III # (with a single tank volume of 30,000m3) have been completed. Civil works of general intake well, intake canal, lifting pump house, cyclone grit chamber and sand-water separation room; The sludge treatment area has completed the main works of sludge concentration tank, sludge dewatering machine room and sludge storage and transportation room; The auxiliary project completed the civil works of the main transformer and distribution room. Complete sets of equipment and main materials have entered the site for acceptance and installation. Pipeline and cable installation works were also carried out at the same time. Up to now, the total investment of the project is 83.79 million yuan.
Now the construction of sewage treatment plant has entered the final stage, and the main work of civil engineering and equipment installation has been completed. In March, 2004, the collected municipal sewage has entered the pool one after another, and the cultivation of biological strains and activated sludge has begun, and the follow-up projects such as roads, fences, greening and comprehensive buildings have been built. Joint debugging of complete sets of equipment; The debugging and trial operation of SBR treatment process will reasonably shorten the construction period and speed up the construction progress under the premise of ensuring the engineering quality, and strive to be fully completed in June 2004, so as to ensure the smooth operation of SBR sewage treatment process of three series of biological ponds at the end of June and meet the design discharge standards.
Company Address: West Section of Xinjian Road, Baoji City 13
Postal code: 72 1000
Tel: 09 17-3230206
Hanzhong sewage treatment plant
1, sewage treatment plant overview:
The first phase of Hanzhong Sewage Treatment Plant successfully passed the environmental protection acceptance and was officially put into operation. Hanzhong Sewage Treatment Plant is the first urban sewage treatment plant built and put into operation along the Han River in Shaanxi. Its completion has alleviated the water pollution situation of the Han River and effectively guaranteed the water quality of the Han River as the water source of the middle route of the South-to-North Water Transfer Project.
The design scale of the sewage treatment plant is 654.38+10,000 tons of urban sewage per day, and the first phase of the project will treat 50,000 tons of urban sewage per day. This project is an important urban infrastructure project that uses national debt, government investment, bank loans and Danish government equipment loans to purify urban industrial wastewater and domestic sewage. It is a secondary biochemical sewage treatment plant using DE oxidation ditch process. After a year's trial operation, the effluent and sludge indicators are strictly controlled according to the national standards, and the standards are stable, and the conditions for formal operation are met. The first phase of the sewage treatment plant can treat 50%-60% of the industrial wastewater and domestic sewage in Hanzhong City, including the production wastewater of more than a dozen enterprises such as Hanjiang Pharmaceutical Factory and Nitrogen Fertilizer Plant and all the domestic sewage of the residents in the east of the city. After the completion of the second phase of the sewage treatment plant, its service scope can cover most of the urban areas of Hanzhong City, and at the same time, the development of reclaimed water reuse project can reduce the water pollution in the Han River and effectively save water resources.
2. Process flow and description
(1) Phase I adopted the biological sludge treatment process, that is, adsorption biodegradation.
The process flow is as follows:
Sewage → Off-site pumping station → Coarse grid → On-site lifting pump house → Fine grid? → aeration tank → sedimentation tank → selection tank → oxidation ditch → final sedimentation tank → contact tank → Hanjiang River (see note).
After sewage enters the factory, it is necessary to separate large pieces of garbage, such as plastic bags and leaves, through a coarse grid. After the garbage comes out, it will be handled by the sanitation department. Because the water level entering the factory from the pipeline is very low (the factory is higher than the horizontal line), in order to facilitate the work, lifting the pump room plays a great role. Here, six submersible lift pumps with a capacity of 3000m3/h are used, and the lift of the pumps is 17m, so as to carry out the following processes on the ground. Fine grids are used to remove small pieces of garbage.
Aerated grit chamber is used to remove fine inorganic particles (such as silt and cinder) and surface oil from sewage.
The next step is the key to decontamination. It is divided into two parts, aeration tank and sedimentation tank. Firstly, activated sludge (a kind of bacterial micelle composed of microorganisms and bacteria) is mixed in the water of the aeration tank, and the oxygen continuously released from the micropores at the bottom of the tank promotes its metabolism, and the activated sludge absorbs and degrades organic matter; Then, the water enters the sedimentation tank for removing suspended matters, such as SS, and at the same time, part of BOD5 is removed. After the activated sludge is precipitated and separated, it flows back to the aeration tank to degrade the water in the next tank.
In addition, there are three systems in the aerated grit chamber, namely, gas supply system, reflux system and excess sludge discharge system (microbial biomass should not exceed the standard, and it will be discharged if it exceeds the standard). The two processes are combined into one, and most of the organic matter in the water has been removed, reaching the national discharge standard and can be directly discharged into the Han River.
The Hanjiang River could have been self-purified through a rich biological chain. However, due to the strong pollution of domestic sewage, the original long biological chain is shortened and the short biological chain almost disappears, so the water quality will go from bad to worse. However, the sewage treatment plant only uses microorganisms to strengthen its self-purification function, remove excessive nitrogen and phosphorus organic matter brought by domestic sewage and improve its eutrophication. (In addition, because the treatment is not industrial sewage, there is no need for special metal pollution treatment. )
(2) In the second phase of planning.
The influent quality of the first-stage design sewage: BOD5:150mg/l; SS: 180mg/l； Total nitrogen: 35 mg/L; Trichlorophenol: 5 mg/L.
Effluent water quality standard: BOD5 ≤ 25mg/L; SS≤25mg/l； NH3-n ≤10mg/l; Total phosphorus ≤3.5 mg/L. 。
Water quality standard: BOD5 ≤ 20mg/L; SS≤20mg/l； NH3-N≤ 10mg/l； CODcr: ≤60 mg/l, phosphate: ≤ 0.5mg/l.
For the sludge produced in the sewage treatment process, the first phase of the project adopts the method of direct dehydration of biological sludge, and the dehydrated sludge will be further treated to realize the recycling of resources. Sludge disposal and landfill will be carried out in the near future, and resources will be recovered in the long term.
3. Advantages and problems of this method
(1) Advantages:
1) The biological reaction tank, sedimentation tank and reflux pump house are designed as an integrated square tank, which saves nearly 40% of land compared with conventional practices such as separated circular amplitude flow tank and separated reflux pump house.
2) Dehydrated dry sludge is successfully transported to the Pearl River by high-pressure screw pump with large capacity through long-distance pipeline. The sludge transportation has obtained good environmental conditions, which is the first in China and the largest and longest transportation distance abroad.
3) Stainless steel diving perforated pipe is used for sewage precipitation effluent, which has good effect and is leading in China.
4) Biological filtration deodorization is used to remove the odor generated by the grit chamber. It is still the leader of urban sewage treatment in China.
(2) Question:
1) This project was originally implemented according to the national integrated wastewater discharge standard before 1998. 1 998 65438+1October1,the requirements for phosphorus removal have been improved. In the future, the biological reaction tank of the first stage process can be slightly modified and adjusted to improve the phosphorus removal effect, so that the effluent of the first stage is equivalent to that of the second stage to be built in the future.
Tongchuan sewage treatment plant
Tongchuan Sewage Treatment Plant is an enterprise unit, which implements enterprise management mechanism. Its main function is to collect and treat industrial wastewater and domestic sewage in the old city of Tongchuan. The factory has 62 employees, including 24 with college education or above and 6 with senior and intermediate titles, with high quality. The factory now has offices, production technology department, financial planning department and other departments, and the party, government, industry and youth organizations are sound.
The total investment of the project is 68.92 million yuan, which is a key construction project of provinces and cities. The project was completed in February 2003. There are 6 sewage treatment facilities such as SBR pool, 3km dedicated power supply line,17km sewage collection trunk and branch pipe network, 10 inverted siphon and 2 pressurized pumping stations. 1 10 sewage outlet was built, and domestic advanced SBR biochemical treatment process was used to treat sewage. The designed sewage treatment scale is 35,000 tons/day, and the service areas are Wangyi District of Tongchuan City and yintai district.
The trial operation of the project began on June 9, 2005, and it was officially put into production on August 2, 2005. According to the monitoring of relevant departments, the main indexes of the effluent such as COD, BOD5 and SS have reached the national secondary discharge standard. On February 6th, 65438, Tongchuan sewage treatment project successfully passed the provincial completion acceptance, officially announcing the end of Tongchuan sewage zero treatment history. At present, the daily sewage treatment capacity is 6.5438+0.7 million cubic meters, and the sewage treatment facilities and equipment are running well and the process is stable. The official operation of Tongchuan Sewage Treatment Plant has played an important role in the treatment of urban sewage in Tongchuan. It is of great significance and far-reaching influence to protect Tongchuan water resources, improve the pollution of Qishui River in Tongchuan and protect the downstream Weihe River system.
Tongchuan Sewage Treatment Plant started construction in June 2000 and was completed in February 2003. The designed sewage treatment capacity is 35,000 tons/day, and the treatment level is Grade II. Using SBR process, the effluent destination is Qishui River, the second tributary of Weihe River in this city. It was officially put into operation on June 9, 2005. The sewage treatment facilities in this factory are running normally, and the influent concentration of main pollutants is COD: 471.8 mg/L; BOD:208.2mg/L； Total nitrogen: 5 1.5 mg/l; Total phosphorus: 4. 1mg/L, effluent concentration of main pollutants: 70.8 mg/l; BOD: 13.7mg/L； Total nitrogen: 26.04 mg/L; Total phosphorus: 0.84mg/L, reaching the discharge standard. After the sludge is dried in the concentration tank, it is compressed and sent to the landfill.
Weinan sewage treatment plant
Weinan Sewage Treatment Plant is located in Zhangzhuang, east of Weinan City, covering an area of 10037 mu, with a short-term design scale of 60,000 tons/day and a long-term design scale of 654.38+10,000 tons/day. The effluent should meet the first-class standard in GB 8978- 1996.
The project started at 1999, and the first phase of the project was completed in 2004. It is the first sewage treatment plant built in Weinan City. The total investment in the first phase of the project is about11500 million RMB, of which $4.69 million is borrowed from the Danish government.
The sewage treatment process adopts sequencing batch activated sludge treatment process (SBR process), and part of the treated sewage is used as the water source of the reuse water plant, and the rest is discharged into the river. The sludge treatment process adopts the direct dehydration process of sludge concentration dehydrator, and the treated sludge is used for greening fertilizer or sanitary landfill.
Weinan city sewage treatment plant adopts advanced treatment technology, so it has the characteristics of short process, land saving, energy saving and up-to-standard sewage treatment quality. The characteristics of high. At present, the Yellow Water Plant with a daily processing capacity of 40,000 tons is under construction.
Xi' an Shibei Shiqiao sewage purification center
The sewage purification center of Anbei Shiqiao adopts DE oxidation ditch system (pre-anaerobic tank) for nitrogen and phosphorus removal, and the treatment capacity of the first phase project is 6.5438+500,000 cubic meters/day. The measured results of treatment effects in each stage show that the treatment effect of Deoxidation ditch is remarkable. The total removal rates of COD, TN and TP reached 87.5%-96.6%, 63.6%-66.9% and 85.0%-93.4% respectively. The effluent TN is 9.0- 10. 1 mg/L and TP is 0.42-0.42.
Postal code: 7 10086
Area code: 029
Legal person: Cao Yu Tel: 8429798 1
Address: Xiyaotou
Main products: sewage treatment
Xi' an sewage treatment plant
After the renovation project of Xi 'an Sewage Treatment Plant is completed, it can provide 6× 104m3 /d reclaimed water every day, which can be used for industrial water and municipal miscellaneous water in the western suburbs, opening up a second water source for Xi 'an, which is short of water. In addition, the secondary treatment degree of 6× 104m3 /d is also improved compared with the present situation. According to the designed import and export water quality of this project, the pollutants discharged into Zaohe River will be reduced every year after the project is rebuilt, including BOD5=9782 tons, SS= 14563.5 tons and COD = 18060.2 tons. Due to the reduction of pollutants entering Zaohe River, the environmental situation of Zaohe River will be greatly improved.
Xi 'an Sewage Treatment Plant is the earliest urban sewage treatment plant in Xi 'an. 1956 was completed and 1958 was put into production, with a daily processing capacity of 4×104m3/d; 1963 was expanded for the first time, and the daily treatment capacity was increased to 6×104m3/d. The sewage was treated by primary machinery, and the sludge was digested at moderate temperature and naturally dried and dehydrated. 1976 was expanded for the second time, and the treatment capacity reached12×104m3/d. The sewage was treated by secondary biological treatment, and the sludge was mechanically dehydrated after being digested at medium temperature.
Although the plant has been expanded twice, due to the conditions at that time, many equipments are special equipment for non-sewage treatment projects. After years of operation, the equipment performance is degraded, the energy consumption is high, the treatment efficiency is reduced, and the process is backward, so it is impossible to maintain normal production and operation, and the treated water quality is difficult to guarantee. Therefore, the plant has carried out comprehensive technical transformation, appropriate expansion and equipment renewal, in order to achieve stable treatment effect, improve treatment capacity, save energy and reduce consumption, ensure water quality and realize partial sewage reuse.
The total investment of this project is about 1. 1 billion yuan (including the Danish government loan of 3.96 million US dollars). The main equipment and technology are imported from krüger Company in Denmark. At present, the renovation project is being implemented. Civil engineering is expected to be completed by the end of May this year, and mechanical and electrical equipment is being installed. It is planned to put into trial operation at the end of 2006, 5438+0.
Technical introduction
Xi 'an Sewage Treatment Plant mainly treats industrial wastewater and domestic sewage in the western suburbs of Xi 'an, 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, which will reach 16× 104m3/d after reconstruction and expansion, of which 4× 104m3/d primary treatment will be discharged into Zaohe River through underground culvert, 6.
The influent quality is: COD = 450mg/l TN = 40mg/l..
BOD5 = 220mg mg/L TP = 8.5mg mg/L.
SS = 300mg mg/L NH3-N = 26mg/L.
PH = 6.5 ~ 8.5 Water temperature T= 13-25℃
This transformation is mainly to transform the sewage treatment technology and equipment to improve the treatment efficiency and water quality. A2/O aeration tank is transformed from the original ordinary plug-flow aeration tank, and the residual activated sludge is directly dewatered mechanically after concentration. The medium-load system adopts the traditional activated sludge process, and the sludge is directly mechanically dehydrated after sludge concentration and moderate temperature digestion, and the solid content of dehydrated sludge is about 20%.
After renovation, it is estimated that the effluent quality can reach the following indicators:
Medium load system: COD ≤100 mg/L.
BOD5 ≤ 30mg/L.
Ss ≤ 30mg/l
PH=6.5~8.5
Effluent from sand filtration in A2/O system: COD ≤ 50mg/l TN ≤15mg/l.
BOD5 ≤10mg/L TP≤ 1 mg/L.
SS ≤ 5mg/L NH3-N ≤ 5mg/L.
PH=6.5~8.5
After the renovation project of Xi 'an Sewage Treatment Plant is completed, it can provide 6× 104m3 /d reclaimed water every day, which can be used for industrial water and municipal miscellaneous water in the western suburbs, opening up a second water source for Xi 'an, which is short of water. In addition, the secondary treatment degree of 6× 104m3 /d is also improved compared with the present situation. According to the designed import and export water quality of this project, the pollutants discharged into Zaohe River will be reduced every year after the project is rebuilt, including BOD5=9782 tons, SS= 14563.5 tons and COD = 18060.2 tons. Due to the reduction of pollutants entering Zaohe River, the environmental situation of Zaohe River will be greatly improved.
Yan 'an Sewage Treatment Plant
Yan 'an Sewage Treatment Plant is located in Qiaogou Town, Yan 'an City, covering an area of 1 15 mu. It was registered in Yan 'an Administration for Industry and Commerce on 200 1 10 with a registered capital of 50 million RMB, mainly engaged in sewage treatment and sewage fertilizer processing.
The total investment of Yan 'an sewage treatment project is188.88 million yuan, including sewage treatment plant and urban sewage collection pipe network system, which are all under the jurisdiction of sewage treatment plant. The commissioning of the water inlet of the project was completed in March 2003, and the effluent quality basically met the requirements of the national comprehensive wastewater discharge (Grade II) standard. The sewage treatment plant is equipped with four Orbar ditches, with a daily treatment capacity of 65,438+250,000 cubic meters. Two of them have completed supporting production equipment, forming a daily processing capacity of 25,000 cubic meters. The civil works of the other two oxidation ditches have been completed. At present, from the perspective of sewage collection and economic benefits, an oxidation ditch has been put into trial operation. According to statistics, from June 5438 to July 2004, * * * treated 2,858,400 cubic meters of sewage, with an average daily treatment capacity of 1.36 million cubic meters, which has reached and exceeded the design level. It is estimated that the short-term processing capacity is 25,000m3/day and the long-term processing capacity is 50,000m3/day.
Address: East Shilipu, Qiaoergou
Postal code: 7 16000
Tel: 22 1 1328
Registration date:10/16/1998.
Administrative region code: 6 1260 1
Number of employees: 62
Legal Person: Xu Yaping.
Scope: Responsible for urban sewage treatment and discharge.