摘要
目的研究多孔生态混凝土系统(Ecol-co系统)对模拟农田尾水中总氮(TN)、总磷(TP)、高锰酸盐指数(COD_(Mn))的净化效能,得出较适宜的净水植物,分析系统对各污染物的去除机制.方法采用自制Ecol-co小试装置,设置空白对照、无植物Ecol-co、水菖蒲、空心菜、茭白、黑麦草Ecol-co 6个试验组,以模拟农田尾水为试验原水,在高、中、低3个进水污染物质量浓度水平下开展试验.黑麦草Ecol-co组试验在冬季进行,其余试验均在夏秋季进行.结果夏秋季种植水菖蒲、空心菜和茭白的植物Ecol-co试验系统对TN、TP及COD_(Mn)的去除率可分别达到40%~82%、90%~99%、65%~95%;冬季种植黑麦草Ecol-co系统对TN、TP及COD_(Mn)的去除率分别为50%~64%、94.44%~99.9%、73%~85%;Ecol-co系统对各污染物的去除率明显高于空白对照系统;种植植物Ecol-co试验系统的TN去除率较无植物Ecol-co系统有显著提高.结论Ecol-co系统处理模拟农田尾水时,可获得较好地去除TN、TP及COD_(Mn);填充生态混凝土基质可明显提升TN、TP及COD_(Mn)的去除效能;种植水生植物对TN去除有显著的促进作用.夏秋季节,水菖蒲、空心菜为较适宜的水生植物,黑麦草则适于在冬季种植.
The aim of this paper is to study the efficiency of an ecological system with ecological concrete as matrix(Ecol-co system)on removing total nitrogen(TN),total phosphorus(TP)and Permanganate index(COD_(Mn))from synthetic farmland drainage water,then obtain a more suitable water-purifying plant,and analyze the removal mechanism of each pollutant by the system.An experiment was performed using self-designed devices containing control system,no planting system,alamus Ecol-co system,water spinach Ecol-co system,zizania aquatica Ecol-co system and ryegrass Ecol-co system,respectively,with synthetic farmland drainage water as tested water.Three influent contaminants concentration level were adopted in the experiment.Those experimental Ecol-co systems(water calamus,water spinach and water chestnut)removed TN,TP and COD_(Mn)at 40%~82%、90%~99%、65%~95%,respectively in summer and autumn.50%~64%、94.44%~99.9%、73%~85%removals of TN,TP and COD_(Mn)were achieved by the Ecol-co systems with ryegrass in winter.The removals of TN,TP and COD_(Mn)achieved by the Ecol-co systems were greater than that exerted by the control treatment overall;the Ecol-co system with plants removed TN at a greater efficiency than that of without plants.In summary,Ecol-co system could effectively eliminate TN,TP and COD_(Mn);ecological concrete was observed to be significantly favorable to the removals of those three contaminants;aquatic plants in the system could observably improve the TN removals,calamus,water spinach and ryegrass(in winter)were appropriate for the system according to this study.
作者
徐微
张松
高松
张震
XU Wei;ZHANG Song;GAO Song;ZHANG Zhen(School of Resources&Environment,Anhui Agricultural University,Hefei,China,230036)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第6期1137-1145,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家重点研发计划项目(2018YFD0800301-05)
安徽省高等学校自然科学研究重大项目(KJ2017ZD16)
江苏省太湖污染控制与治理科技项目(TH2018403)。
关键词
生态混凝土
生态沟渠
农田尾水
面源污染
ecological concrete
ecological ditches
farmland drainage water
non-point source pollution
