Abstract:

Aiming at the problem of the effluent total phosphorus being unable to reach the set standard steadily in the pre-anaerobic oxidation ditch of a domestic sewage treatment plant, the effects of adding coagulant poly-alumnium chloride(PAC) on the removing rate of total phosphorus by beaker experiments have been studied. The experiments show that when PAC dosage is 15.0 mg/L, and pH 5.0-8.2, the effluent TP is decreased to less than 0.5 mg/L. Under the above conditions, adding PAC at the water outlet of oxidation ditch, and monitoring continuously the TP concentration at the water outlet of two sedimentation tank. The results show that adding appropriate amount of PAC at the water outlet of oxidation ditch can guarantee steadily the effluent water quality to meet the requirements of the first class of "the Urban Sewage Treatment Plant Pollutant Discharge Standards"(GB 18918—2002)and "the Water Pollutant Discharge Limits of Guangdong Province"(DB 44/26—2001).

Key words: chemical phosphorus removal, PAC, pre-anaerobic oxidation ditch

摘要：

针对厌氧前置氧化沟生活污水处理厂存在的出水总磷不能稳定达标的问题, 采用烧杯实验, 研究了投加混凝剂聚合氯化铝(PAC)对生活污水总磷去除率的影响。实验表明, 当PAC投加量为15.0 mg/L, pH为5.0～8.2时, 出水总磷降到0.5 mg/L以下。采用上述条件在氧化沟出水口投加PAC, 连续监测了二沉池出水口总磷浓度, 结果表明, 通过在氧化沟出水口投加适量的PAC, 可保证出水水质稳定达到《城镇污水处理厂污染物排放标准》(GB18918—2002)和《广东省水污染物排放限值》(DB 44/26—2001)一级排放标准的要求。

关键词: 化学除磷, 聚合氯化铝, 厌氧前置氧化沟

CLC Number: 

• X703.1