低温胁迫下包埋厌氧氨氧化污泥颗粒的脱氮性能_许祥祥
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2020-02-18 09:43:35
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低温胁迫下包埋厌氧氨氧化污泥颗粒的脱氮性能许祥祥,周鹏,王国建(沈阳建筑大学市政与环境工程学院,辽宁沈阳110168)摘要:为解决在厌氧氨氧化反应进程中,厌氧氨氧化菌抗低温能力较差的问题,以聚乙烯醇-海藻酸钠为包埋剂包埋厌氧氨氧化污泥颗粒,采用UASB反应器研究了HRT对驯化过程中氨氮和亚硝态氮去除效果的影响,考察了温度变化对低温下包埋厌氧氨氧化菌颗粒脱氮效果的影响。结果表明,当进水氨氮浓度为50mg/L,HRT为7h时,投加15%包埋污泥后的UASB反应器具有较强的脱氮能力,对NH+4-N、NO-2-N的去除率分别为95%和89%。相同条件下,水温从30℃阶梯式降低到14℃时,包埋厌氧氨氧化菌颗粒对NH+4-N的去除率从95%下降为70%,对NO-2-N的去除率从89%下降为63%。在14℃下运行期间,调节水力停留时间为11h可以提高脱氮效果,NH+4-N、NO-2-N去除率分别在85%和79%左右。采用聚乙烯醇-海藻酸钠为包埋剂包埋厌氧氨氧化细菌,能大幅度提高低温胁迫下的脱氮性能。关键词:低温;聚乙烯醇-海藻酸钠;厌氧氨氧化中图分类号:TU992.3文献标志码:A文章编号:1673-9353(2019)02-0014-05doi:10.3969/j.issn.1673-9353.2019.02.004基金项目:国家自然科学基金项目(51108277)Denitrificationperformanceofanaerobicammoniumoxidationsludgeparticlesencapsulatedbypolyvinylalcohol-alginategelunderlowtemperaturestressXuXiangxiang,ZhouPeng,WangGuojian(SchoolofMunicipalandEnvironmentalEngineering,ShenyangJianzhuUniversity,Shenyang110168,China)Abstract:Inordertosolvetheissueofpoorlowtemperatureresistanceofanaerobicammoniaoxidizingbacteriaintheprocessofanaerobicammoniaoxidation(ANAMMOX),thepolyvinylalcohol-sodiumalginatewasusedasembeddingmediumtoembedANAMMOXsludgegranules.TheeffectofHRTontheremovalofammonianitrogenandnitritenitrogenbyUASBreactorduringdomesticationwasinvestigated.TheresultsshowedthatUASBreactorwith15%embeddedsludgehadstrongdenitrificationabilitywhentheinfluentammonianitrogenconcentrationwas50mg/LandHRTwas7h.TheremovalratesofNH+4-NandNO-2-Nwere95%and89%respectively.Underthesameconditions,theremovalrateofammonianitrogenandnitritenitrogendecreasedfrom95%to70%andfrom89%to63%whenthewatertemperaturewassteppeddownfrom30℃to14℃.TheremovalefficiencyofNH+4-NandNO-2-Ncouldbeimprovedbyadjustinghydraulicresidencetimeto11hat14℃,whichwere·41·第13卷第2期2019年4月供水技术WATERTECHNOLOGYVol.13No.2Apr.2019about85%and79%respectively.ThedenitrificationperformanceofANAMMOXbacteriaunderlowtemperaturestresscouldbegreatlyimprovedbyembeddingitwithpolyvinylalcohol-sodiumalginate.Keywords:lowtemperature;polyvinylalcohol-sodiumalginate;anaerobicammoniaoxidation厌氧氨氧化(ANAMMOX)是指氨氧化细菌在缺氧的情况下,将氨态氮和硝态氮转
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