图片名称
Yixing Rural Sewage Treatment PPP Project (Wanshi Town)

Yixing Rural Sewage Treatment PPP Project (Wanshi Town)

The treatment scope of the Yixing Rural Sewage Treatment Project PPP Project (Second Bid Section) is Wanshi Town, Yixing. The project financing mode is PPP mode, and the franchise period is 26 years (including construction period).

Case description

Project Introduction
 
Project Overview
 
The treatment scope of the Yixing Rural Sewage Treatment Project PPP Project (Second Bid Section) is Wanshi Town, Yixing. The project financing mode is PPP mode, and the franchise period is 26 years (including construction period).
 
This project is granted by the Yixing Municipal Public Utilities Administration with the franchise right of the project company. After the franchise period stipulated in the franchise contract expires, the project facilities and related rights and interests will be handed over to the Yixing Municipal People's Government or its designated agency free of charge.
 
The project is mainly divided into three governance modes to treat rural sewage:
 
1) Management mode—For villages with good shape and a large amount of sewage that can be collected, priority will be given to the mode of take-over treatment, and the village domestic sewage will be connected to the urban sewage Pipe Network.
 
2) Relatively centralized treatment mode ---- For villages that do not have the conditions for takeover, are relatively concentrated, and have high discharge requirements, according to the principle of connecting households and households, the domestic sewage of farmers within a certain range is collected uniformly, and the purification tank is used. to be processed.
 
3) Decentralized treatment mode—For villages with relatively scattered residences or difficult pipeline network construction, single-family sewage is collected on the spot and treated in a purification tank.
 
The relative centralized processing mode process flow chart is as follows:


 


 Figure 1-1 Process flow chart of relative centralized processing mode


 The farmer’s sewage first enters the second-format septic tank, and then flows into the sewage well. The sewage pipeline first flows into the Japanese Daji purification tank for primary treatment through grading, and then flows into the Lexus purification tank for further treatment. Through two-stage biochemical reactions, The four main indicators COD, total nitrogen, ammonia nitrogen and total phosphorus in the effluent all meet the emission standard of Class A.
 
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