碱度类型及浓度对剩余污泥中温厌氧消化的影响

中国环境科学2019,39(5)：1954~1960ChinaEnvironmentalScience碱度类型及浓度对剩余污泥中温厌氧消化的影响赵明明,李夕耀,李璐凯,彭永臻*,张琼(城镇污水深度处理与资源化利用国家工程试验室,北京市污水脱氮除磷处理与过程控制工程技术研究中心,北京工业大学环境与能源工程学院,北京100124)摘要：为了探究不同碱度物质(Na2CO3、KHCO3、NaHCO3)和浓度范围(2000,3000,4000mg/L)(以CaCO3计)对中温厌氧消化系统的影响,采用了密封的半连续搅拌反应器进行批次试验.综合反应器运行与微生物高通量测序分析,结果表明在3种不同碱度类型中Na2CO3能推进水解酸化过程,而在产气减量方面NaHCO3表现更为突出,说明在调节系统碱度时,Na2CO3更易促进水解酸化这一限速阶段,而NaHCO3能使水解酸化细菌与产甲烷菌之间保持平衡,保证甲烷产量;在不同NaHCO3浓度情况下,增加投加碱度的浓度使水解能力增强,相应会导致脱水性能恶化,而系统中挥发性脂肪酸含量变化不大,过量碱度将使得系统产气和减量能力下降.关键词：剩余污泥；碱度；中温厌氧消化；水解酸化细菌；产甲烷菌中图分类号：X703文献标识码：A文章编号：1000-6923(2019)05-1954-07Effectsofalkalinitytypeandconcentrationonmesophilicanaerobicdigestionofexcesssludge.ZHAOMing-ming,LIXi-yao,LILu-kai,PENGYong-zhen*,ZHANGQiong(NationalEngineeringLaboratoryforDeepTreatmentandRecyclingofUrbanSewage,BeijingEngineeringResearchCenterforNitrogenandPhosphorusRemovalTreatmentandProcessControlofSewage,CollegeofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100124).ChinaEnvironmentalScience,2019,39(5)：1954~1960Abstract：Toexploretheeffectsofdifferentalkalinitysubstances(Na2CO3,KHCO3,NaHCO3)andconcentrationranges(2000,3000,4000mg/L(asCaCO3))onthemiddle-temperatureanaerobicdigestionsystem,astaticbatchsemi-continuousstirredtankwasusedintheexperiment.Thecomprehensivereactoroperationandmicrobialhigh-throughputsequencinganalysisshowedthatNa2CO3couldpromotethehydrolysisandacidificationprocessinthreedifferenttypesofalkalinity,whileNaHCO3wasmoreprominentingasproductionandreduction.ItindicatedthatNa2CO3wasmorelikelytopromotehydrolysisandacidificationinthelimitingstagecomparedtoothersamples,whenthealkalinityofthesystemwasadjusted.Underdifferentconcentrations,thehydrolysiscapacitywasenhancedbyincreasingtheconcentrationofaddedbasicity,whichledtothedeteriorationofthedehydrationperformance,whiletheVolatileFattyAcidschangedlittle,andtheexcessbasicitywillreducethegasproductionandreductionofthesystem.Keywords：wasteactivatedsludge；alkalinity；moderate-temperatureanaerobicdigestion；hydrolysisacidizingbacteria