A^2/O和MBR组合工艺在寒冷地区污水处理中的应用

Application of A^2/O and MBR Combined Process for Wastewater Treatment in Cold Area

以内蒙古赤峰市喀喇沁旗锦山污水处理厂新建工程为例,探讨了A2/O+MBR组合工艺在寒冷地区的适用性以及设计经验。该工程近期处理规模为2×10^4m^3/d,采用三段回流式A2/O+MBR组合工艺。因冬季设计水温为9℃,故采用应对寒冷地区的保温设计,将所有建筑物和构筑物增加框架围护结构或彩钢板进行保温。实践结果表明,在冬季运行时,保持较高的污泥浓度(缺氧池污泥浓度控制在8 g/L左右)和适当提高曝气量(好氧池末端DO控制在4 mg/L以上),可使出水水质指标稳定达到并优于《城镇污水处理厂污染物排放标准》(GB 18918—2002)中的一级A标准。

Taking the project of Jinshan wastewater treatment plant in Karaqin Banner,Chifeng City,Inner Mongolia as an example,the applicability of A^2/O and MBR combined process in cold area and the design experience were discussed. The recent treatment capacity of Jinshan wastewater treatment plant was 20 000 m^3/d. Three-stage reverse-flow A^2/O and MBR combined process was adopted. The design water temperature in winter was 9 ℃,the thermal insulation design for cold areas was adopted.The frame enclosure structure or color steel plate were adopted to keep warm in all the buildings and structures. The results showed that when the sludge concentration was kept high( the sludge concentration in anoxic tank was controlled at about 8 g/L) and the aeration volume was increased properly( the DO at the end of aerobic tank was controlled at more than 4 mg/L),the effluent water quality could reach and superior to the first level A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant( GB 18918-2002).