化学除磷辅助A^2/O工艺处理城市污水脱氮除磷研究  

STUDY ON DENITRIFICATION AND DEPHOSPHORIZATION OF MUNICIPAL WASTEWATER BY CHEMICAL PRECIPITATION ASSISTED A^2/O PROCESS

作　　者：胡猛[1] 曹军 张艳 于洁[3] 邢传宏[3] 

机构地区：[1]辉县市环境保护局,河南辉县453600 [2]郑州市污水净化有限公司,郑州450002 [3]郑州大学水利与环境学院,郑州450001

出　　处：《环境工程》2014年第3期29-33,共5页Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07210-001-001)

摘　　要：针对碳源无法同时满足脱氮除磷需要,采用化学除磷辅助常规A2/O工艺,通过调控厌氧池侧流比来调控后续生物池COD/TN比,开展城市污水同步深度脱氮除磷研究。对比分析铝盐、铁盐、钙盐和镁盐除磷效果发现,氯化镁是适宜的化学除磷剂,最佳pH为10.00,最佳配比M(Mg2+)/M(NH+4)/M(PO3-4)为1.5∶1.5∶1。综合考虑TN和TP去除效率,侧流比为10%时,工艺出水TN和TP均达GB 18918—2002《城镇污水处理厂污染物排放标准》一级A标准。To solve conflict needs for carbon source in bio-denitrification and bio-dephosphorization, chemical precipitation assisted A2/O process was employed to achieve simultaneous removal of nitrogen and phosphorus through regulating side flow ratio at the anaerobic tank. Batch test results indicated that among selected aluminum salts, ferric salt, calcium salt and magnesium salt, magnesium chloride was the most suitable chemical agent for phosphorus precipitation. The optimum pH was 10. 00 while the optimum ratio of Mg2~ ： NH4＋ ： PO^- was 1.5： l. 5： 1. Comprehensive consideration, as side flow ratio of 10% the concentration of TN and TP in the effluent could meet the Level A Grade 1 of ＂ Discharge Standard of Pollutants for M unicipal Wastewater Treatment＂ （ GB 18918--2002 ）.

关 键 词：化学沉淀 A2 O工艺 脱氮 除磷 侧流比 

分 类 号：X703[环境科学与工程—环境工程]