铁碳填料和硫铁矿填料强化两段式人工湿地处理农村生活污水
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摘要
以强化用于农村污水处理的两段式人工湿地对氮、磷去除能力为目的,搭建了前段为砾石填料,后段分别投加部分铁碳填料和硫铁矿填料的两段式水平流人工湿地系统,以模拟农村生活污水为处理对象,在水力停留时间为3 d,曝气量为0. 2 L/min的条件下,研究填料在去除污染物中的作用及其机理。结果表明:3种人工湿地中,对模拟农村生活污水处理效果最好的是铁碳人工湿地,中后段处理效果强于其他2种人工湿地,出水TN、TP、NH_4~+-N和COD平均质量浓度分别为2. 75,2. 65,1. 90,20. 33 mg/L。硫铁矿人工湿地处理效果与砾石人工湿地差别不大,铁碳人工湿地在中性条件通过微电解除氮时,未产生中间产物NH_4~+-N与NO_2~--N。
Three two-stage constructed wetlands with gravel,iron-carbon and pyrite as substrate were established for synthetic rural domestic sewage treatment. The HRT was determined as 3 d,and the aeration rate was 0. 2 L/min. The effect and mechanism of substrates in pollutant removal were analyzed. The results indicated that: the iron-carbon constructed wetland reached the highest removal efficiency among three constructed wetlands; better removal efficiency was observed in the middle and back end of iron-carbon constructed wetland of the concentration of total nitrogen,total phosphorus,ammonia nitrogen,COD for 2. 75,2. 65,1. 90,20. 33 mg/L,respectively; there were little differences between gravel constructed wetland and pyrite constructed wetland in removal efficiency; the iron-carbon constructed wetland did not produce ammonia nitrogen or nitrous nitrogen as intermediates,during micro-electro denitrification process.
Three two-stage constructed wetlands with gravel,iron-carbon and pyrite as substrate were established for synthetic rural domestic sewage treatment. The HRT was determined as 3 d,and the aeration rate was 0. 2 L/min. The effect and mechanism of substrates in pollutant removal were analyzed. The results indicated that: the iron-carbon constructed wetland reached the highest removal efficiency among three constructed wetlands; better removal efficiency was observed in the middle and back end of iron-carbon constructed wetland of the concentration of total nitrogen,total phosphorus,ammonia nitrogen,COD for 2. 75,2. 65,1. 90,20. 33 mg/L,respectively; there were little differences between gravel constructed wetland and pyrite constructed wetland in removal efficiency; the iron-carbon constructed wetland did not produce ammonia nitrogen or nitrous nitrogen as intermediates,during micro-electro denitrification process.
引文
[1]陈子爱,贺莉,潘科.农村生活污水处理现状与分析[J].中国沼气,2015,33(6):68-71.
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[10]李文超,石寒松,王琦,等.硫自养反硝化技术在污废水处理中应用研究进展[J].水处理技术,2017,43(8):1-6.
[11]Shin K-H,Cha D K.Microbial reduction of nitrate in the presence of nanoscale zero-valent iron[J].Chemosphere,2008,72(2):257-262.
[12]Wu L,Chen S P,Zhou J S,et al.Simultaneous removal of organic matter and nitrate from bio-treated leachate via iron-carbon internal micro-electrolysis[J].RSC Advances,2015,5(84):68356-68360.
[13]Gao Y,Xie Y W,Zhang Q,et al.Intensified nitrate and phosphorus removal in an electrolysis-integrated horizontal subsurface-flow constructed wetland[J].Water Research,2017,108:39-45.
[14]Ma T,Zhang L Y,Xi B D,et al.Treatment of farmer household tourism wastewater using iron-carbon micro-electrolysis and horizontal subsurface flow constructed wetlands:a full-scale study[J].Ecological Engineering,2018,110:192-203.
[2]钱海燕,陈葵,戴星照,等.农村生活污水分散式处理研究现状及技术探讨[J].中国农学通报,2014,30(33):176-180.
[3]曹笑笑,吕宪国,张仲胜,等.人工湿地设计研究进展[J].湿地科学,2013,11(1):121-128.
[4]刘盛佳.人工湿地技术在农村生活污水综合治理中的应用[J].低碳世界,2017(8):29-30.
[5]Deng S H,Li D S,Yang X,et al.Biological denitrification process based on the Fe(0)-carbon micro-electrolysis for simultaneous ammonia and nitrate removal from low organic carbon water under a microaerobic condition[J].Bioresource Technology,2016,219:677-686.
[6]Luo J H,Song G Y,Liu J Y,et al.Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface[J].Journal of Colloid and Interface Science,2014,435:21-25.
[7]Li J L,Li D S,Cui Y W,et al.Micro-electrolysis/retinervus luffae-based simultaneous autotrophic and heterotrophic denitrification for low C/N wastewater treatment[J].Environmental Science and Pollution Research,2017,24(20):16651-16658.
[8]Wu L M,Liao L B,Lv G C,et al.Micro-electrolysis of Cr(Ⅵ)in the nanoscale zero-valent iron loaded activated carbon[J].Journal of Hazardous Materials,2013,254/255:277-283.
[9]王旦梅,周琪.废水中硝酸盐的硫自养反硝化工艺处理研究与进展[J].净水技术,2017,36(3):32-37.
[10]李文超,石寒松,王琦,等.硫自养反硝化技术在污废水处理中应用研究进展[J].水处理技术,2017,43(8):1-6.
[11]Shin K-H,Cha D K.Microbial reduction of nitrate in the presence of nanoscale zero-valent iron[J].Chemosphere,2008,72(2):257-262.
[12]Wu L,Chen S P,Zhou J S,et al.Simultaneous removal of organic matter and nitrate from bio-treated leachate via iron-carbon internal micro-electrolysis[J].RSC Advances,2015,5(84):68356-68360.
[13]Gao Y,Xie Y W,Zhang Q,et al.Intensified nitrate and phosphorus removal in an electrolysis-integrated horizontal subsurface-flow constructed wetland[J].Water Research,2017,108:39-45.
[14]Ma T,Zhang L Y,Xi B D,et al.Treatment of farmer household tourism wastewater using iron-carbon micro-electrolysis and horizontal subsurface flow constructed wetlands:a full-scale study[J].Ecological Engineering,2018,110:192-203.
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