某污水厂污泥深度脱水工艺及集约化布置设计

Deep Dewatering Process and Intensive Layout of Sludge in WWTP

摘要:

上海某污水处理厂的处理对象以市政生活污水为主，并有部分经预处理的食品行业工业废水，有机质含量较高。该工程的污泥处理目标含水率为60%，且由于污泥出路为电厂掺烧，不允许投加石灰，因此，需比选出经济、合理的处理工艺。经过中试或生产性试验等充分分析，确定了“污泥重力浓缩+机械浓缩+污泥调理+板框脱水”的工艺路线。此外，由于厂区用地十分紧张，创新性地采用“外方内圆”集约化重力污泥浓缩池的布置形式，有效节省占地。结合先进工艺和精细化设计，探讨了不加石灰的情况下，污水处理厂污泥深度脱水工艺比选和集约化布置的设计要点，为国内类似污泥处理案例提供一定思路和案例参考。

Abstract:

The treatment object of a wastewater treatment plant (WWTP) in Shanghai is mainly municipal domestic sewage, and includes some pretreated industrial wastewater from the food industry with higher organic matter content. The target moisture content of sludge treatment in this project is 60%. Because the sludge outlet is mixed with power plant for firing, the lime is not allowed. Therefore, the economical and reasonable treatment processes are required to compare and select. After full analysis of pilot test or production test, the process route of “sludge gravity concentration + mechanical concentration + sludge conditioning + plate frame dewatering” is determined for this project. In addition, due to the shortage of land in the WWTP, the layout of “external square and internal circle” intensive gravity sludge concentration tank is innovatively used for this project, which can effectively save land. Combined with the advanced technology and refined design, the design essentials in the comparison, selection and intensive layout of deep dewatering process of sludge in the WWTP without lime are discussed, which can provide some ideas and case references for similar sludge treatment cases in China.