In accordance with the characteristics of low carbon source and comparative high nitrogen and phosphorus concentration, contact oxidation-enhanced coagulation combined process was adopted to treat the rural distributed wastewater of Chongming island. Furthermore, the effects and mechanism of this process was studied. The results showed that the effluent quality was COD<50 mg/L, NH3-N<5 mg/L, TN<20 mg/L and TP<0.5 mg/L, meeting the first standard of GB18918-2002. The mechanism of pollutants removal depended on kinds of analytical ways. From the results of GC-MS, the biological technology could well treat the alkane, arene and heterocyclic compounds; the removal of TN was attributed to simultaneous nitrification and denitrification indicated by the accumulation of nitrite; dissolved phosphorus could be treated by chemical precipitation while non-orthophosphate by adsorption. Moreover, the combined process exhibited advantages such as small land occupation, low cost, easy maintenance and management. It was suitable for treatment of the domestic sewage in rural areas.%针对崇明某地农村分散式生活污水低碳高氮磷的特性,研究接触氧化/强化混凝组合工艺处理农村污水的效果和机理.结果表明,组合工艺的平均出水化学需氧量(COD) ＜50 mg/L、氨氮(NH3-N) ＜5 mg/L、总氮(TN) ＜ 20 mg/L、总磷(TP)＜0.5 mg/L,达到城镇污水处理厂污染物排放标准(GB18918-2002)一级排放标准.气相色谱—质谱联用仪(GC-MS)分析表明:组合工艺能够有效去除有机污染物,生化处理对烷烃类污染物、芳烃及杂环类化合物均有良好的去除效果;卡要总磷除磷机理:化学沉淀去除溶解性正磷酸盐,吸附机制去除聚磷酸盐、有机磷等非正磷酸盐;系统亚硝酸盐累积标志着同步硝化反硝化的发生.同时,该组合工艺还具有占地而积少、造价低、易于维护管理等优点,适合农村地区分散式生活污水的处理.
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