人工湿地废水处理机理

对人工湿地的构造、作用机理进行了较详尽的说明，湿地中物理、化学及生物协同作用以及湿地植物输氧造成的湿地基质中好氧、缺氧和厌氧状态的交替出现是保证其对氮磷及有机物具有较强处理效率的原因。研究表明：对进水浓度较低的城市污水，湿地的ＢＯＤ５和ＣＯＤ去除率大于８０％，出水ＢＯＤ２为１０ｍｇ／Ｌ左右。总氮及总磷去除率可大６０％和９０％，较常规二级处理方式具有一定的优越性。

Mechanism of Wastewater Treatment in Constructed Wetlands

A detailed investigation was made on the configuration and mechanism of constructed wetlands. It was concluded that the high efficiencies of removing nitrogen, phosphorus and organics are mainly due to the synchronization of physical, chemical and biological processes, and due to the alteration of aerobic, anoxic and anaerobic conditions. For municipal wastewater containing less COD, BOD5 and COD removal rates are greater than 80%, and BOD5 in effluent is around 10 mg/L. The removal rates of total nitrogen and total phosphorus are greater than 60% and 90%.