高效沉淀池在污水处理厂深度除磷中的工艺调试研究

2018-12-13 01:56:50徐辉赵林辉
科技创新与应用 2018年29期

徐辉 赵林辉

摘 要: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》(GB 18918-2002)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。

关键词:城镇污水处理厂;高效沉淀池;深度除磷;工艺调试研究

中图分类号:X703.1 文献标志码:A 文章编号:2095-2945(2018)29-0116-04

Abstract: 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 factor of eutrophication of water body. Phosphorus removal can be achieved by high-efficiency sedimentation tank. Commissioning research showed that high-efficiency sedimentation tank had good treatment efficiency on advanced phosphorus removal. The index of TP in effluent could meet or even exceeding the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater 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 sludge quantity, PAM dosage and PAC dosage) were confirmed step by step, and excess sludge discharge was determined by sludge concentration and sludge settling velocity.

Keywords: urban sewage treatment plant; high efficiency sedimentation tank; deep phosphorus removal; process commissioning research

隨着我国城镇化进程的加快,国家对城镇污水处理厂的排放标准进一步提高。根据《水污染防治行动计划》,62个国控重点湖库和沿海11省56个地市212个区县行政区划范围将执行《城镇污水处理厂污染物排放标准》(GB 18918-2002)[1]的一级A标准。污水处理厂的新建工程和提标改造工程大规模的展开,使得污水的深度处理工艺在各地城镇污水处理厂得以实施。

磷是一种重要的稀缺资源,具有不可再生的特点,但是过量的磷排放进入水体中将造成水体富营养化,影响水体的生态系统[2]。氮、磷是威胁水质的营养物,其在水体生态系统中的循环特点决定水体富营养化的限制因子是磷,磷对水体富营养化的贡献远大于氮[3]。……

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