模块化人工湿地基质筛选与除污性能评价
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摘要
为进一步解决农村污水处理问题,在利用单一基质传统人工湿地筛选出最佳COD、TP和TN去除基质的基础上,比较了最佳基质组成的组合基质模块化人工湿地和传统人工湿地对COD、TP和TN的去除效果。结果表明,无烟煤、铝污泥和沸石分别是去除COD、TP和TN的最佳基质。综合考虑COD、TP和TN的去除效果,确定运行时间为4个月。组合基质模块化人工湿地对COD、TP和TN的综合效果最佳,第4个月的平均去除率分别为82.26%、92.16%、76.50%,相应出水平均质量浓度分别为26.29、0.49、7.11mg/L,达到了《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准,满足城镇景观用水和一般回用水的要求。
In order to further solve rural sewage treatment,the best substrates for COD,TP and TN removal were selected using single substrate traditional constructed wetland.And the pollutants removal performances of composite substrates modularized constructed wetland and traditional constructed wetland were compared using the best substrates.Results showed that anthracite,alum sludge and zeolite were the best substrates for removal of COD,TP and TN,respectively.Running time was selected as 4 months considering comprehensive removal efficiencies of COD,TP and TN.Composite substrates modularized constructed wetland had the best average removal efficiencies of82.26%,92.16% and 76.50% for COD,TP and TN,respectively,at the fourth month.The effluent average mass concentrations of COD,TP and TN were 26.29,0.49 and 7.11 mg/L,respectively,meeting the first Class A emission standard of"Discharge standard of pollutants for municipal wastewater treatment plant"(GB 18918-2002),which could be used as urban landscape water or general recycling water.
In order to further solve rural sewage treatment,the best substrates for COD,TP and TN removal were selected using single substrate traditional constructed wetland.And the pollutants removal performances of composite substrates modularized constructed wetland and traditional constructed wetland were compared using the best substrates.Results showed that anthracite,alum sludge and zeolite were the best substrates for removal of COD,TP and TN,respectively.Running time was selected as 4 months considering comprehensive removal efficiencies of COD,TP and TN.Composite substrates modularized constructed wetland had the best average removal efficiencies of82.26%,92.16% and 76.50% for COD,TP and TN,respectively,at the fourth month.The effluent average mass concentrations of COD,TP and TN were 26.29,0.49 and 7.11 mg/L,respectively,meeting the first Class A emission standard of"Discharge standard of pollutants for municipal wastewater treatment plant"(GB 18918-2002),which could be used as urban landscape water or general recycling water.
引文
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[3]刘振东,汪健.模块化人工湿地在农村生活污水处理中的应用[J].绿色科技,2016(2):45-47.
[4]籍国东,孙铁珩,李顺.人工湿地及其在工业废水处理中的应用[J].应用生态学报,2002,13(2):224-228.
[5] LEI L,LI X,ZHANG X.Ammonium removal from aqueous solutions using microwave-treated natural Chinese zeolite[J].Separation&Purification Technology,2008,58(3):359-366.
[6] BOOKER N A,COONEY E L,PRIESTLEY A J.Ammonia removal from sewage using natural Australian zeolite[J].Water Science&Technology,1996,34(9):17-24.
[7]张曦,吴为中,温东辉,等.氨氮在天然沸石上的吸附及解吸[J].环境化学,2003,22(2):166-171.
[8]张翔凌.不同基质对垂直流人工湿地处理效果及堵塞影响研究[D].北京:中国科学院研究生院,2007.
[9] LUEDERITZ V,ECKERT E,LANGE WEBER M,et al.Nutrient removal efficiency and resource economics of vertical flow and horizontal flow constructed wetlands[J].Ecological Engineering,2002,18(2):157-171.