城市污水处理过程中不同形态氮类营养物的转化特性
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2020-03-14 10:22:51
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第9卷第9期环境工程学报Vol.9,No.92015年9月ChineseJournalofEnvironmentalEngineeringSep.2015城市污水处理过程中不同形态氮类营养物的转化特性金鹏康宋利任武昂(西安建筑科技大学环境与市政工程学院,西安710055)摘要针对不同形态氮类营养物在城市污水处理系统中迁移转化机理尚不明确这一问题,通过现场监测和实验室模拟分析,研究不同形态氮类营养物在整个城市污水处理系统(A/A/O工艺)中的转化特性。研究结果表明,在原污水总氮中溶解态氮和颗粒态氮比例相当,浓度分别为39.28mg/L和41.24mg/L,无机氮是溶解态氮的主要成分,比例占93.2%(36.61mg/L),而有机氮含量极少,仅为2.67mg/L。在颗粒态氮中有机氮比重很大,约占96.58%(39.83mg/L)。在整个一级处理过程中溶解态氮变化量很小,而颗粒态有机氮减少了45%,总氮降低主要是由于颗粒态有机氮通过沉淀作用去除而实现的。现场监测和模拟实验结果表明,溶解性有机氮在厌氧区和缺氧区中由于被厌氧微生物降解而大幅度减少,而在好氧区却有一定程度的增加。二级出水中的氮主要还是以无机氮为主,可通过进一步优化工艺参数来强化系统硝化/反硝化作用,去除污水中残留的无机氮。关键词氮类营养物城市污水处理系统转化特性中图分类号X703文献标识码A文章编号1673-9108(2015)09-4193-06TransformationcharacteristicsofdifferentformsofnitrogennutrientsinprocessofwastewatertreatmentJinPengkangSongLiRenWuang(SchoolofEnvironmental&MunicipalEngineering,Xi’anUniversityofArchitecture&Technology,Xi’an710055,China)AbstractTheaimofthisstudywastoinvestigatethetransformationprocessofdifferentformsofnitrogennutrientsbyfiledmeasurementandsimulatetestinthewholecitysewagetreatment(A/A/O)system.Thestudyshowedthatinfluentdissolvednitrogenandparticulatenitrogenproportionwerealmostthesame,concentrationsof39.28mg/Land41.24mg/L,respectively.Dissolvednitrogenwasmainlycomposedofdissolvedinorganicnitrogen,whichportionconstituted93.2%(36.61mg/L),butdissolvedorganicnitrogenconcentrationwasverylow(2.67mg/L).Theparticulateorganicnitrogenportionconstituted96.26%oftheparticulatenitrogen.Dis-solvednitrogenchangeswasverysmallintheprocessofthewholeprimarytreatment,butparticulateorganicni-trogendecreased45%.Particulateorganicnitrogenwasremovedduetoprecipitation,whichresultedinlowerto-talnitrogen.Filedmeasurementandsimulatetestshowedthatdissolvedorganicnitrogenwassignificantlyre-ducedbyanaerobicmicrobialdegradationintheanaerobicandanoxiccompartmentsofthesecondarytreatment,whereasaslightlyincreaseofdissolvedorganicnitrogenconcentrationswasobservedintheaerobiccompartment.Secondaryeffluentnitrogenmainlycomposedofinorganicnitrogen,throughthefurtheroptimizationofprocesspa-rameters,wecanenha
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