人工湿地基质及其生物膜对生活污水中污染物去除效果的研究

Study on the Effect of Constructed Wetland Substrate and its Biofilm on Pollutants Removal from Domestic Sewage

采用三种人工湿地基质(沸石、陶粒和炉渣)处理生活污水,研究不同基质及其生物膜对生活污水中COD_(cr)、氨氮、总氮、总磷的去除效果。试验表明,在进水氨氮浓度为4~8 mg/L时,沸石、陶粒、炉渣对于氨氮的吸附效果分别为42.24%、38.90%和34.61%;人工湿地运行45 d后,通过基质表面附着的生物膜作用,对氨氮的去除效果得到明显提升,氨氮、COD_(cr)、TP和TN去除率分别为73.50%、70.18%、41.25%和46.30%,表明人工湿地基质表面附着的生物膜是去除生活污水中污染物的主要途径。

Three kinds of constructed wetland substrates(zeolite,ceramsite and slag)were used to treat domestic sewage.The removal effects of different substrates and their biofilms on COD_(Cr),ammonia nitrogen,total nitrogen and total phosphorus in domestic sewage were studied.The experimental results show that when the influent ammonia nitrogen concentration is 4-8 mg/L,the adsorption efficiency of zeolite,ceramsite and slag for ammonia nitrogen is 42.24%,38.90% and 34.61%,respectively.After 45 days of operation,the removal efficiency of ammonia nitrogen was significantly improved through the biofilm action attached to the substrate surface.The removal rates of ammonia nitrogen,COD_(Cr),TP and TN were 73.50%,70.18%,41.25% and 46.30%,respectively.It shows that the biofilm attached to the substrate surface of constructed wetland is the main way to remove pollutants from domestic sewage.