高效沉淀池在污水处理厂深度除磷中的工艺调试研究

我国对城镇污水处理厂的排放标准日益提高,污水深度处理工艺正广泛应用于城镇污水处理厂的新建和提标改造工程。磷是造成水体富营养化的限制因子,采用高效沉淀池工艺可实现深度除磷。文章进行了高效沉淀池工艺调试研究,研究结果表明高效沉淀池工艺对城镇污水处理厂深度除磷有良好的效果,高效沉淀池出水TP可达到甚至高于《城镇污水处理厂污染物排放标准》(GB18918-2002)的一级A标准。工艺调试研究时,先进行实验室静态试验研究,确定适合生物反应池出水的PAM型号,同时确定PAC和PAM的初始投加量。高效沉淀池工艺调试研究时,按污泥回流量、PAM投加率、PAC投加率逐步确定最佳工艺参数,并根据排泥浓度和污泥沉降比确定最佳排泥量。

The discharge standard of pollutants for municipal wastewater treatment plant becomes stricter. More advanced treatment technologies are applied in the construction projects and upgrading and reconstruction projects. Phosphorus is the limiting factorof eutrophication of water body. Phosphorus removal can be achieved by high-efficiency sedimentation tank. Commissioning researchshowed that high-efficiency sedimentation tank had good treatment efficiency on advanced phosphorus removal. The index of TP ineffluent could meet or even exceeding the first level A criteria specified in the Discharge Standard of Pollutants for MunicipalWastewater Treatment Plant（GB 18918-2002） . The laboratory static test revealed the optimal type of PAM for the effluent of biological reaction tank,and the initial dosage of PAC and PAM for commissioning research. Optimum process parameters （return sludgequantity,PAM dosage and PAC dosage）were confirmed step by step,and excess sludge discharge was determined by sludge concentration and sludge settling velocity.