投碱种类和氨吹脱对污泥碱性发酵产酸的影响
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2020-02-27 13:09:15
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中国环境科学2014,34(5):1194-1199ChinaEnvironmentalScience投碱种类和氨吹脱对污泥碱性发酵产酸的影响李晓玲,彭永臻,,柴同志,朱建平,王淑莹(1.哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090;2.北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京市污水脱氮除磷处理与过程控制工程技术研究中心,北京100124)摘要:采用完全混合式厌氧反应器,比较了NaOH和Ca(OH)22种碱试剂对污泥厌氧发酵产酸的作用效果,结合氨吹脱作用考察了NH4浓度的降低对各有机物水解酸化程度的影响.结果表明在pH值为1O的条件下,以NaOH调节的体系中各种有机物尤其是挥发性脂肪酸(VFAs]的量明显高于以Ca(OH)2调节的体系.Ca(OH)2调节的体系中释放出的蛋白质有部分沉淀,磷酸盐含量也较低,,J、于40mg/L;氨吹脱的体系发酵液中氨氮含量减少了43%,增大了VFAs的积累量;在NaOH和氨吹脱的组合条件下,污泥水解酸化程度最好,SCOD为6732mg/L,蛋白质为2029mg/L,碳水化合物374mg/L,VFAs总量2545mg/L,且氨氮含量低于200mg/L;分析认为氨吹脱作用增大VFAs积累量的原因主要是NH4~浓度的减小,促进了产酸菌对于碳水化合物的发酵.关键词:污泥碱性发酵;投碱种类:氨吹脱;挥发性脂肪酸;正磷酸盐中图分类号:X703.1文献标识码:A文章编号:1000—6923(2014)05—1194—06Theefectofalkalitypesandammoniastrippingonvolatilefattyacidsaccumulationinsludgealkalinefermentation.LIXiao.1ing,PENGYong.zhen‘,,CHAITong.zhi,ZHUJian—ping~,WANGShu—ying(1.StateKeyLaboratoryofUrbanWaterResourceandEnvironment,HarbinInstituteofTechnology,Harbin150090,China:2.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,EngineeringResearchCenterofBeijing,BeijingUniversityofTechnology,Beijing100124,China).ChinaEnvironmentalScience,2014,34(5):1194-l199Abstract:Aseriesofcompletelymixedanaerobicreactorswereoperatedtoinvestigatediferentalkalis(NaOHandCa(OH)2)performanceonsludgedisintegrationandorganicshydrolysisandacidificationinsludgealkalinefermentationsystems.Inaddition,ammoniastrippingwascombinedwithalkaliadjustmenttoobservetheefectofNH4concentrationonthehydrolysisandacidificationefectiveofreleasedorganics.Resultsshowedthatatpill0,sludgedisintegrationaswellasorganicsrelease,especially,volmilefattyacids(VFAs)wasmuchhigherinNaOHsystemsthanthatinCa(OH)2systems.However,partofsolubleproteinandPO4wereprecipitatedwithCaeinCa(OH)2systems.TheP04concentrationwaslessthan40mg/LinCa(OH)2systems.43%ofNH4wasremovedbyammoniastripping.ThemaximumhydrolysisandacidificationperformancewasachievedintheNaOHadjustmentandammoniastrippingsystem.TheSCOD,protein,carbohydrateaswellastotalVFAsconcentrationswere6732,2029,374
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