高出水标准污水处理厂设计

Design of Wastewater Treatment Plant with High Effluent Standard

随着国家对环保事业的重视程度不断提升,污水处理厂的出水标准也在逐步提高。以浙江省温岭市某污水处理厂为例,介绍高出水标准条件下的污水厂设计,以期为同类型污水厂设计提供可参考借鉴的解决方案。该工程设计规模5万m^(3)/d,出水执行《台州市城镇污水处理厂出水指标及标准限值》(试行)地表水准IV类水标准。设计对以往进出水水质数据进行全方位多角度分析,针对该厂进水低碳高氮磷的特点,为充分利用污水中的碳源,最大程度降低脱氮和除磷对碳源的争夺,工程拟采用改良型A/A/O工艺,针对出水总磷和SS要求较高的情况,工程创新性采用“气浮+气水反冲洗滤池”组合工艺。

As the state attaches great importance to the cause of environmental protection, the effluent standards of wastewater treatment plant(WWTP) are also gradually improving. Taking a WWTP in Wenling City of Zhejiang Province as an example, the design of WWTP under the condition of high effluent standard is introduced in order to provide a reference solution for the design of the same type of WWTP. The design scale of the project is 50 000 m^(3)/d, and the effluent will comply with the surface water standard Class IV in Taizhou Town Wastewater Treatment Plant Effluent Index and Standard Limits(for trial). The all-round and multi-angle analysis on the previous water qualities of influent and effluent are carried out in the design. Aiming at the characteristics of low carbon and high nitrogen and phosphorus in the influent of the plant, in order to make full use of the carbon source in the sewage and minimize the competition for carbon source by denitrification and phosphorus removal, the modified A/A/O process is proposed to use in the project. In view of the high requirements for total phosphorus and SS in the effluent,the combined process of "air flotation + air-water backwashing filter" is innovatively adopted in the project.