Zhujiaqiao Sewage Treatment Plant is located in the north of Zhujiaqiao Foreign Trade Terminal, west of Changjiang Road, covering an area of 23 hectares. The total design scale of the project is 400,000 cubic meters of urban sewage treatment per day, and the total investment estimate is about 800 million yuan. According to the program of one-time planning and phased implementation, the first phase of Zhujiaqiao wastewater treatment plant is to treat 100,000 cubic meters per day, with a total investment of 290 million yuan, consisting of two major systems, namely, the plant area and the intake pipe network. The construction of the plant includes water pumping station, fine grating room, primary sedimentation tank, biochemical tank, second sedimentation tank, chlorination room, tail water discharge pumping station and so on. Sewage collection trunk pipe total length of 15.2 kilometers, by the A, B, C three lines. After a comprehensive technical and economic comparison, the biological nitrogen and phosphorus removal process is adopted for sewage treatment, and the mechanical centrifugal thickening and dewatering machine is adopted for sludge treatment. The process is technologically advanced and mature, scientifically and reasonably designed, characterized by reliable operation, small footprint, low unit treatment cost, etc. It is also equipped with on-line monitoring of influent and effluent water quality and water quality testing system. The fully automatic control function enhances the modern management level of the wastewater treatment plant. The total scale of Wuhu Zhujiaqiao Wastewater Treatment Plant is 450,000 tons/day, the first phase of the project (100,000 tons/day) has been completed and put into use, and the second phase of the plant construction scale is 120,000 tons/day, with 80 kilometers of supporting pipeline network and 3 supporting lifting pumping stations. Municipal Development and Reform Commission to develop and reform investment [2007] No. 526 Wen on the project feasibility study report was approved, the total investment estimate of 278.82 million yuan. Sewage treatment process: using improved A2/O biochemical tank sewage treatment process. Sludge treatment process: mechanical centrifugal thickening and dewatering process. In recent years, with the rapid development of urban construction in Wuhu City, the adjustment of sewage treatment system planning, business and cultural new areas into the ZhuJiaQiao sewage treatment plant service area, ZhuJiaQiao sewage treatment plant service area from the original 45 square kilometers to 99 square kilometers, the service population from 550,000 to 900,000 increase. The total scale of Zhujiaqiao wastewater treatment plant is also enlarged from 300,000 M3/d to 450,000 M3/d, therefore, the expansion of Zhujiaqiao wastewater treatment plant is especially necessary and urgent, and at the same time, it is of great significance for the fulfillment of the task of energy saving and emission reduction in the city. The main production process Urban sewage volume, sewage contains more nitrogen and phosphorus, commonly used sewage biological treatment technology to reduce the concentration of BOD, COD and SS in sewage has a certain effect, the removal rate of nitrogen is only 20% [1], the removal rate of phosphorus is even lower, therefore, the secondary biological treatment effluent also contains nitrogen, phosphorus, so that the effluent will result in the eutrophication of the body of water to the drinking water source, Aquatic industry, industrial water brings great harm. This project adopts A2 /O biological nitrogen and phosphorus removal process, sewage treatment structures mainly include: grating, cyclone sand sedimentation tank, primary sedimentation tank, overflow well, A2 /O biochemical tank, secondary sedimentation tank, blower room, sludge reflux pumping room, chlorination room, contact disinfection tank. The sewage enters the cyclone sand sedimentation tank by removing large suspended solids through grating; in the cyclone sand sedimentation tank, the centrifugal force of hydraulic cyclone removes large sand particles, and the sewage enters the primary sedimentation tank; in the primary sedimentation tank, 40-60% of SS is removed, and the effluent is distributed through the overflow well, and then enters into the A2/O biochemical tank, in which the sewage undergoes the process of nitrification and denitrification to remove nitrogen, while the microorganisms adsorb a large amount of phosphorus. At the same time, the microorganisms adsorb a large amount of phosphorus, and the wastewater enters into the secondary sedimentation tank together; in the secondary sedimentation tank, the mixed liquid is separated from the solid-liquid for a period of time, and the wastewater is disinfected by chlorination and discharged to meet the standard; most of the sludge is returned to the flow, and the residual sludge which contains a high concentration of phosphorus enters into the sludge dehydration room for dewatering, and then removes the phosphorus in the sewage. Sludge treatment includes: sludge storage tank, sludge thickening and dewatering machine room. The operation and management of the whole plant adopts advanced computerized automatic control system at home and abroad, so that the production and operation of the plant can realize automatic control. The main process technical parameters Project design water volume: 30 × 10 4 m 3 /d, a scale of 10 × 10 4 m 3 /d Designed water quality: see Table 1.
Designed effluent water quality: to meet the "comprehensive sewage discharge standards" (GB8978-1996) a standard.