2, City East Wastewater Treatment Plant is mainly to deal with the ancient city of Suzhou and the East New District, including Su'an New Village, Donggang New Village, Donghuan New Village, Hongfu New Village and Lihe New Village and other neighborhoods, as well as the Industrial Park start-up area of the domestic sewage. The plant is located to the east of the ancient city, about 850 meters outside the Xiangmen, covering an area of about 54 acres, with a service area of 19.2km2 and a beneficiary population of about 370,000 people. The treatment process adopts the conventional biological treatment method - activated sludge blast aeration method, the sludge is thickened, digested and dewatered and then exported for agricultural use.
The first phase of the Chengdong Sewage Treatment Project was started in January 1985, and in October 1988, the primary treatment was put into trial operation, and in June 1989, the secondary treatment was put into trial operation. In order to solve the living sewage outlet of the start-up area of Suzhou Industrial Park, and add a secondary treatment of 15,000 m3 / d, the project from 94 years to build. Chengdong plant is currently the total amount of secondary treatment of 40,000 m3 / d, the total amount of primary treatment of 92,500 m3 / d, the first phase of the project investment of 10,814,000 yuan, the expansion of the project investment fee of about 15,613,560,000 yuan, the Chengdong Sewage Treatment Plant project by the Shanghai Municipal Design Institute design. City East Sewage Treatment Plant sewage collection system to Ganjian River as the boundary of the south of the city sewage from the southwest to the northeast to Pingzhi sewage lifting pumping station, the north of the city sewage from the northwest to the southeast to the Hangqiao sewage lifting pumping station, after lifting into the Ganjian Road trunk, and then to the Xiangmen sewage lifting pumping station, after lifting to the east of the city sewage treatment plant into the pump room. Suzhou Industrial Park, part of the domestic sewage, convergence of Su Xie Road sewage midway lifting pumping station, and the East New District of domestic sewage convergence into the East Ring into the pumping station, to the East Sewage Treatment Plant treatment.
Chengdong Sewage Treatment Plant mainly accepts domestic sewage, and part of the domestic sewage and similar industrial sewage and primary rain runoff, the design of the water quality into the plant indicators for the BOD5 = 250 mg / l, SS = 250 mg / l, after treatment of the water quality of the factory BOD5 & lt; 20 mg / l, SS & lt; 30 mg / l, to meet the national discharge standards. The completion and commissioning of the East Sewage Treatment Plant to improve the water pollution situation in the ancient city river, to maintain the beautiful appearance of the Gusu Water City, to protect the water resources of the Taihu Lake Basin has played an important role.
Chengdong plant put into operation since the normal operation, process stability, sewage treatment effect is good, fully meet the predetermined requirements of the design. 2000 to deal with sewage 14,662,800 m3, the average daily treatment of 40,100 m3 / d, the average quality of water BOD5, SS, CODcr reached 7.8 mg / l and 22 mg / l, 46.1 mg / l. 2001 to deal with 14,666,600 m3, the average daily treatment of 401,000 m3 / d, the average water quality BOD5, SS, CODcr to 7.8 mg / l and 22 mg / l, 46.1 mg / l, respectively. In 2001, it processed 14,661,600m3 of sewage, with a daily average of 40,200m3/d, and the average effluent quality of BOD5, SS, and CODcr reached 7.4mg/l, 20mg/l, and 44.5mg/l. In recent years, the volume of wastewater treatment has reached the design scale year after year, and the quality of effluent water is lower than that of the "Standard for Discharge of Urban Sewage Plant Effluent and Sludge" (CJ3025-93) issued by the Ministry of Construction. CJ3025-93) of the specified value that BOD5, SS, CODcr are less than 30mg / l, 30mg / l and 120mg / l. City East plant sewage treatment greatly reduce the organic pollution, for the rectification of the urban water environment has played a positive role.
3, Loujiang sewage treatment plant geographic location in the northeast corner of Suzhou city, located in Suzhou Industrial Park, Lou Turnip Industrial North Zone, is an important sub-project of the urban water environment comprehensive management project, Loujiang sewage treatment plant covers an area of 8 hectares, the design capacity of 140,000 tons of plans to be implemented in two phases, all completed, will be processed with 40,000 tons of daily sewage treatment plant with the city of the East *** with the responsibility for Suzhou city center planning area in the northeast (the ancient city, the city's east area, the city's north area) and the Yangbanjing industrial area drainage area of sewage treatment.
Loujiang sewage treatment plant phase I project in December 9, 2000 began construction, January 8, 2004 completion. Sewage treatment scale of 60,000 tons / day, the total investment estimate of 145 million yuan. Treatment process using alternating activated sludge method, secondary biochemical treatment. Designed into the plant water quality CODcr: 360mg/l, BOD5: 180mg/l, SS: 250mg/l, NH3-N: 35mg/l, designed out of the water quality CODcr: 60 mg/l, BOD5: 20mg/l, SS: 20mg/l, NH3-N: 15mg/l. The main equipment of the plant by the Japan Bank of International Cooperation to provide loans, through international bidding to introduce the United States, Japan, the United States, Japan, the United States, the United States and Japan. The main equipments in the plant are loaned by Japan Bank for International Cooperation (JBIC), and the equipments and control systems produced by American, Japanese, German, Swedish and Korean enterprises are introduced through international bidding. The treated water is discharged into Loujiang River (500m downstream of Fenghuangjing) after being upgraded by the effluent pump house.
4, Chengxi Sewage Treatment Plant is located in the west of the ancient city, three incense Road, Temple Jing Bridge south, covers an area of 33.1 acres. The plant is subordinate to the Suzhou City Drainage Management Office, the main acceptance of the new village housing complex, residential sewage and part of the unit discharges of domestic sewage, now the service area from the west of the Gucheng River in the east, west to the West Ring Road north of the Ganzhong Road, south of the Xuxu River. Service area of 5.6K square meters, the total service population of 66,000 people. The treatment process adopts traditional aeration activated sludge method.
Chengxi Wastewater Treatment Plant began construction in April 82, the primary treatment in June 83 put into operation in September 85, the secondary treatment put into operation, the daily treatment of sewage 5000m3. 89 years after the start of the expansion, the expansion part of the 93 years of formal operation, the daily treatment capacity of 12500m3. 20,000m3 in the long term will be reached. 13,000.9 million yuan of total investment by Shanghai Municipal Engineering Design Institute. Municipal Engineering Design Institute design.
The nature of sewage treated in the plant is domestic sewage, and the design concentration of sewage entering the plant is BOD=250㎎/l, SS=250㎎/l; the treated effluent reaches BOD5＜20㎎/l, SS＜30㎎/l. The treated sewage is discharged into the Lishuang River, and then flows into the Grand Canal outside of the city, and the residual sludge of the primary sedimentation tank and the secondary sedimentation tank is naturally thickened by the concentration tank and then transported to landfill.