构建了处理能力为4.5 m3/d的3级阶梯型人工复合生态床生活污水处理中试装置，运用质量平衡的分析方法对稳态运行阶段系统内污染物迁移转化途径进行了量化研究。结果表明，系统对CODcr的平均去除率为87.14%，其中通过微生物异化作用和同化作用去除比例分别为68.45%和18.69%；系统对TN的平均去除率为60.21%，微生物反硝化、微生物同化和植物吸收三者的去除率分别为53.64%、5.39%和1.18%；系统对TP的平均去除率为59.36%，基质吸附、微生物同化和植物吸收三者的去除率分别为43.55%、12.26%和3.55%。微生物对污染物的去除起主要作用，基质吸附是磷去除的主要途径。

A threestage seriesoperational pilot scale constructed wetland was built for domestic wastewater treatment with inflow of 4.5 m3/d .The mass balance method was adopted to quantify the transportation and transformation of pollutants in constructed wetland during steadystate operation.It was shown that the average removal rate of CODcr was 87.14%, in which 68.45% contributed by dissimilation and 18.69% contributed by assimilation.The average removal rate of TN was 60.21% and the contributions of denitrification and microbial assimilation or plant assimilation were 53.64%, 5.39% and 1.18%, respectively.The average removal rate of TP was 59.36% and the contributions of substrates absorption and microbial assimilation or plant assimilation were 43.55%, 12.26% and 3.55%,respectively.In conclusion, microorganisms played a key role in the removal of pollutants and substrates adsorption was the main approach to phosphorus removal.

国家“十一五”科技重大专项(2009ZX0731500203)；三峡库区生态环境教育部重点实验室访问学者基金(KLVF20076)