摘要
用水浮莲(Pistia stratiotes)和水葫芦(Eichhornia crassipes)组合构建生态净化塘深度处理污水处理厂尾水,监测了尾水沿程的氮、磷浓度变化,分析两种漂浮植物生物量、根冠比、叶绿素a、全氮、全磷、根系活力、超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量等的生理响应。结果表明,污水处理厂尾水经生态净化塘处理后,TN、硝酸盐氮、TP和可溶性磷酸盐去除率分别可达72.36%、79.00%、78.57%、80.64%,氨氮和TP达到了《地表水环境质量标准》(GB 3838—2002)的Ⅱ类标准,有效地减轻了周边受纳水体的污染负荷。在水流沿程方向上,水浮莲和水葫芦的生物量、全氮、全磷、叶绿素a和根系活力均显著降低,根冠比、叶片和根系的SOD活性显著升高(P<0.05);同时两种漂浮植物叶片和根系的MDA含量明显上升,说明植物体内膜脂过氧化加剧。由此可见,水浮莲、水葫芦对氮、磷等营养盐比较敏感,这是其可以有效去除氮、磷的原因。
An ecological purification pond with Pistia stratiotes and Eichhornia crassipes was constructed for deep treatment of tail water from sewage treatment plant.Nitrogen and phosphorus concentrations along the ecological purification pond were monitored.The root-shoot ratio,biomass,chlorophyll a,full nitrogen,full phosphorus,root activity,SOD activity and MDA content were analyzed for reflecting their physiological response.Results showed that TN,nitrate nitrogen,TP and dissolved phosphorus removal rates of tail water reached 72.36%,79.00%,78.57% and 80.64%,respectively.Moreover,ammonia nitrogen and TP concentrations met GradeⅡof“Environmental quality standards for surface water”(GB 3838-2002),which reduced the pollution load of the receiving water.Along the water flow,the biomass,full nitrogen,full phosphorus,chlorophyll a and root activity of Pistia stratiotes and Eichhornia crassipe all decreased significantly,while the root-shoot ratio and SOD activity of both leaves and roots were reversed(P<0.05).The raise of MDA levels in leaves and roots explained the membrane lipid peroxidation of the floating macrophytes.To sum up,Pistia stratiotes and Eichhornia crassipe was sensitive to nutrients of nitrogen and phosphorus.That was the reason of their perfect capability for nitrogen and phosphorus removal.
作者
徐寸发
闻学政
张迎颖
刘海琴
宋伟
王岩
秦红杰
张志勇
XU Cunfa;WEN Xuezheng;ZHANG Yingying;LIU Haiqin;SONG Wei;WANG Yan;QIN Hongjie;ZHANG Zhiyong(Institute of Agricultural Resource and Environmental Sciences,Jiangsu Academy of Agricultural Sciences,Nanjing Jiangsu 210014;Central Laboratory,Jiangsu Academy of Agricultural Sciences,Nanjing Jiangsu 210014)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2019年第11期1335-1340,共6页
Environmental Pollution & Control
基金
江苏省农业科技自主创新资金资助项目(No.CX(16)1003-3)
江苏省重点研发专项(No.BE2016338)
关键词
水浮莲
水葫芦
污水处理厂尾水
净化效果
生理响应
Pistia stratiotes
Eichhornia crassipes
tail water from sewage treatment plant
purification effect
physiological response
