化学生物絮凝工艺处理城市污水的试验研究

试验采用化学生物絮凝工艺处理上海市低浓度城市污水，分析不同聚合氯化铝铁(PAFC)投加量条件下的污染物去除效果．探讨化学生物絮凝工艺的反应实质。平行对比试验结果显示：化学生物絮凝工艺是一种化学和生物协同作用深度集成的污水强化一级处理工艺，在相同加药量条件下，该工艺对污染物的去除效果显著优于化学强化一级处理工艺；在总水力停留时间2h，污泥回流比33％，聚丙烯酰胺(PAM)投加质量浓度0．5mg／L，化学生物絮凝池各廊道的DO值分别为1．9．3．2mg／L、1．3～2．5mg／L和0．3-1．5mg／L的条件下，液体PAFC投加质量浓度为70mg／L(Al2O3 10．8％．Fe2O31．8％)时，化学生物絮凝工艺的出水CODcrTP、SS和NH3浓度满足城市污水综合排放二级标准。

Research on the chemical- biological flocculation process for treating municipal wastewater

The chemical - biological flocculation process has been studied for treating the Shanghai low concentration municipal wastewater under a variety of PAFC dosage in order to further the research on its flocculation mechanism. The results of the parallel pilot-scale experiment show that the chemical - biological flocculation process is a highly integrated wastewater treatment process of the chemical flocculation and the biological flocculation, and the chemical - biological flocculation process is superior to the chemical enhanced primary treatment process. While the PAFC dosage is 70 mg/L (Al2O3 10.8%,Fe2O3 1.8%), the CODCr, TP, SS and NH3 concentrations of effluent from the chemical - biological flocculation process meet the national wastewater integrated discharge standard at the condition of the total HRT 2 h, the PAM dosage of 0.5 mg/L, the sludge reflux ratio of 33%, the DO of 1.9 - 3.2 mg/L, 1.3 - 2.5 mg/L and 0.3 - 1.5 mg/L in different corridors.