季节变化对组合湿地污水处理系统净化力的影响

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1、第37卷第9期中南林业科技大学学报Vol.37No.92017年9月JournalofCentralSouthUniversityofForestry&TechnologySep.2017Doi:10.14067/j.cnki.1673-923x.2017.09.021http://qks.csuft.edu.cn季节变化对组合湿地污水处理系统净化力的影响付新喜，吴晓芙，陈永华，奚成业，周鑫（中南林业科技大学环境科学与工程学院，湖南长沙410004）摘要：建立了用以处理城镇污水的“表流A-潜流B-表流C”组合人工湿地（400t/d）中试系统

2、，监测分析了组合系统净化力的季节性变化规律。结果表明：组合系统出水的5项指标年均值达到了国家城镇污水处理厂污染物排放[GB18918—2002]一级A标准，A、B、C单元之间净化力差异显著，其中B单元对系统净化力的贡献率最高；组合系统COD去除率存在显著的季节性差异，冬季COD去除率明显低于其他季节；组合系统氮、磷去除率季节性差异不显著，原因是B单元对系统氮、磷去除率贡献大，而其氮、磷去除率受季节影响小。要克服季节温度变化对组合系统净化力的影响，有必要进一步增强B单元的吸附过滤功能和提高系统冬季的生物活性。关键词：城镇污水；人工湿地中试系统

3、；污染物去除率；季节效应中图分类号：S718.57；X52文献标志码：A文章编号：1673-923X(2017)09-0124-05EffectofseasonalchangesonpollutantremovalrateofaconstructedwetlandsystemestablishedfortreatmentofmunicipalsewageFUXinxi,WUXiaofu,CHENYonghua,XIChengye,ZHOUXin(CollegeofEnvironmentalScienceandEngineering,Cent

4、ralSouthUniversityofForestryandTechnology,Changsha410004,Hunan,China)Abstract:Apilotconstructedwetlandsystemconsistingofacombinationof“surface-flowA-subsurfaceflowB-surfaceflowC”unitswasestablishedfortreatmentofmunicipalsewage.Theeffectofseasonaltemperaturechangeonthepollutan

5、tremovalrateofthepilotsystemwasmonitored.Theresultsshowedthattheannualaverageeffluentqualityofthepilotsystemmetthe1stgradeAofthenationaldischargestandardsforpollutantsformunicipalwastewatertreatment[GB18918-2002].ThereweresignificantdifferencesintreatmentefficiencyamongUnit

6、sA,BandC,ofwhichUnitBgavethehighestpollutantremovalrateforallanalyzedwaterqualityindex.TheCODremovalrateofthepilotsysteminwinterwasapparentlylowerthanthatinotherseasonsandthedifferencewassignificant.Incomparison,thedifferenceinremovalratesofphosphorusandnitrogenofthepilots

7、ystemwasinsignificantthroughoutthewholeyear.ThereasonisthatthemajorpartsofphosphorusandnitrogenwereremovedinunitBwhiletheremovalratesofphosphorusandnitrogeninunitBwerelittleaffectedbytemperaturechanges.Furtherenhancementofthebio-activityofthepilotsystemincoldseasonandincre

8、aseintheadsorptionandfiltrationcapacityofUnitBareessentialmeasurestostrengthenthetreatmen