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时间:2019-06-03
《3种浮萍对富营养化水体的修复》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第10卷第5期环境工程学报Vol.10,No.52016年5月ChineseJournalofEnvironmentalEngineeringMay20163种浮萍对富营养化水体的修复1111121*谢朦张飞章莹颖秦霄马炯肖炘成家杨(1.北京大学深圳研究生院环境与能源学院,深圳518055;2.中国科学院过程工程研究所,北京100190)摘要选用Spirodelapolyrhiza、Lemnaaequinoctialis和Landoltiapunctata3种太湖浮萍为实验对象,在实验室条件下,研究其生长状况及其对模拟太湖水体的净化效果。结果表明,3种浮萍对水体总氮、氨氮、硝氮和总磷都具有很好
2、的净化效果,S.polyrhiza,L.aequinoctialis和L.punctata对总氮的去除率分别为80.3%、73.7%和83.8%,对总磷的去除率分别为98.8%,96.4%和99.3%,但对有机物的去除作用比较有限。除营养吸收外,浮萍的水质净化能力还表现在对水中环境因子的影响,3种浮萍都能够维持水体pH在4.6~6.5的范围内以适合自身生长,并能够在一定程度上增加水体的溶解氧含量。硝化和反硝化作用是氮去除的主要途径,由于水体溶解氧含量较高,促进了好氧反硝化作用的进行。相比于S.polyrhiza和L.aequinoctialis,L.punctata具有较强的水体净化效果和生长
3、速度,是净化太湖富营养化水体的理想水生植物。关键词浮萍太湖富营养化水体修复中图分类号X52文献标识码A文章编号1673-9108(2016)05-2447-07DOI10.12030/j.cjee.201412076Effectofthreeduckweedspeciesonremediationofeutrophicwater1111121XieMengZhangFeiZhangYingyingQinXiaoMaJiongXiaoXinChengJiayang(1.SchoolofEnvironmentandEnergy,ShenzhenGraduateSchool,PekingUniver
4、sity,Shenzhen518055,China;2.InstituteofProcessEngineering,ChineseAcademyofSciences,Beijing100190,China)AbstractThreeTaiLakelocalduckweedspecies,Spirodelapolyrhiza,Lemnaaequinoctialis,andLandolt-iapunctata,wereinvestigatedforthefeasibilityoftheirtreatmentofeutrophicwaterunderlabconditions.Theresultss
5、howedthattheduckweedspecieshadobviousremovalabilityofthetotalnitrogen(TN),ammonium+-(NH4-N),nitrate(NO3-N),andtotalphosphorus(TP).TheremovalratesofTNbyS.polyrhiza,L.aequi-noctialisandL.punctatewere80.3%,73.7%and83.8%,respectively,andtheremovalratesofTPwere98.8%,96.4%and99.3%,respectively.However,the
6、rewaslimitedremovalefficiencyofchemicaloxygendemand(COD).Besidesnutrientremoval,duckweedaffectedthecharacteristicsofthetestedwaterinseveralas-pects,suchasmaintainingpHbetween4.6and6.5forbettergrowthconditions,andenhancingthedissolvedoxy-gen(DO)level.Nitrificationanddenitrificatonprocesseswerethemajo
7、rmechanismsfornitrogenremoval,andaerobicdenitrificationmayplayacrucialroleduetoahighDOlevelinthetestedwater.ComparedwithS.polyrhizaandL.aequinoctialis,L.punctatagrewbetterundertheeutrophicconditionsan
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