Changning District Waste Comprehensive Disposal Center for the 2010 Shanghai World Expo supporting sanitation construction project, the project completed by stages, currently mainly responsible for solid waste treatment in Shanghai Changning District. The leachate treatment station of Changning District Waste Comprehensive Disposal Center undertaken by Weley Group has been handed over to the owner for operation for one year. How about the operation in one year? Let's take a look at it!
Project background
The leachate in the comprehensive waste disposal center of Changning District mainly comes from the waste transfer station of 800 tons/day and the kitchen waste treatment plant of 60 tons/day. Before 2016, the disposal center had not yet built leachate treatment facilities, and the leachate in the plant was regularly transported by tank trucks to the landfill leachate treatment station of the Jiangqiao Incineration Plant for treatment. Willy Environmental Protection Group undertook the equipment supply and service of the center's leachate treatment project in 2016.
Due to the high concentration of leachate pollutants, small site area and extremely irregular shape, the project selected the highly efficient CJMBR process (aerobic biochemical technology with CJR as the core) as the main process, and the CJMBR treatment efficiency is high and the operation is stable. This project is the first time that the CJMBR process has been applied in the leachate treatment field of the transfer station.
Solution
The main process route of this project is: "pretreatment +CJMBR+ Fenton". The effluent of the system meets the standard of "Water Quality Standard for Sewage discharged into Urban Sewers" (DB31/445-2009).
The landfill leachate from the storage pit of the refuse transfer station and the kitchen leachate from the garbage sump contain a lot of solid particles and oils. In order to reduce the subsequent biochemical treatment load, the design of this project adopts an air flotation system to pretreat the incoming water, greatly reduce the SS concentration of raw water, and remove the residual oils and fats.
The leachate after pretreatment enters the CJMBR reaction system. The reactor adopts a special jet aeration mode with high sludge load and volume load, which can significantly degrade the organic pollutants in the influent water. At the same time, the high-load biochemical reactor has high sludge concentration and strong biological assimilation of sludge, which can remove a lot of nitrogen pollutants while removing COD. After the external ultrafiltration water, the water quality can be discharged according to the standard.
In order to cope with the impact load caused by the drastic change of raw water quality, the project designed the Fenton advanced oxidation process at the back end of the CJMBR process as a safeguard measure for in-depth treatment to ensure the long-term stable operation of the system.
Project significance
The CJR reactor in CJMBR technology has an efficient aeration method. Compared with the traditional biochemical system, the blower air volume selected by the system is reduced by 30-40%, the overall pool capacity is reduced by about 40%, and the energy consumption is reduced by more than 20%. The CJMBR technology selected for the project of the leachate treatment station of Changning District Waste Comprehensive Disposal Center has overcome the problems of geographical location and site limitations, achieved the energy saving and emission reduction target of the leachate treatment station, solved the problems caused by the external transport of leachate in the site, and protected the water and ecological environment of the plant and its surrounding area.
The smooth implementation of this project has completely solved the problem of leachate treatment in Changning District Waste Comprehensive Disposal Center, and accumulated valuable experience for the Group's future leachate treatment in transfer stations. This is another successful application of CJMBR technology in the field of leachate treatment in transfer stations, following the successful application of CJMBR technology in the field of leachate treatment in landfill sites. It also further reflects the superiority of CJMBR technology in the leachate industry.