pH对厨余废物两相厌氧消化中水解和酸化过程的影响

©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.http://www.cnki.net张波,史红钻,张丽丽,等.pH对厨余废物两相厌氧消化中水解和酸化过程的影响[J].环境科学学报,2005,25(5):665-669ZHANGBo,SHIHongzuan,ZHANGLili,etal.TheinfluenceofpHonhydrolysisandacidogenesisofkitchenwastesintwo2phaseanaerobicdigestion[J].ActaScientiaeCircumstantiae,2005,25(5):665-669pH对厨余废物两相厌氧消化中水解和酸化过程的影响张波,史红钻,张丽丽,蔡伟民3上海交通大学环境科学与工程学院,上海200240收稿日期:2004208230修回日期:2004212223录用日期:2004212230摘要:通过间歇实验探讨了pH对厨余废物两相厌氧消化中水解和产酸过程的影响,详细考查了厨余废物在4个pH(pH=5,7,9,11)条件下的水解率、挥发酸(VFA)产量和速率、有机酸的组分和水解酸化产物的分配.实验结果表明,控制pH为7时,厨余废物具有更高的水解和酸化率,以水解酸化液体中TOC、COD与固液混合液中总COD、TOC比值表示的厨余废物水解率在实验第9d分别达到86%和82%,VFA浓度在实验第4d达到36g·L-1,VFA产量是未调节pH时的2倍.在pH为7时,水解酸化产物中乳酸浓度相对较低,VFA中主要以丁酸和乙酸为主,丙酸很少.控制pH为7不但可以提高水解酸化效率,而且为后续产甲烷过程提供了更有利的基质,从而优化了厨余废物处理的两相厌氧消化工艺.关键词:厌氧;水解;酸化;pH;厨余废物文章编号:025322468(2005)0520665205中图分类号:X705文献标识码:ATheinfluenceofpHonhydrolysisandacidogenesisofkitchenwastesintwo2phaseanaerobicdigestionZHANGBo,SHIHongzuan,ZHANGLili,CAIWeimin3SchoolofEnvironmentalScience&Engineering,ShanghaiJiaotongUniversity,Shanghai200240Received30August2004;receivedinrevisedform23December2004;accepted30December2004Abstract:BatchexperimentswerecarriedouttodeterminetheeffectofpHonhydrolysisandacidogenesisofkitchenwastesinthetwo2phaseanaerobicdigestion.ThesolubilizationrateandVFAproductionrateofkitchenwasteswithcontrolled2pHat5,7,9and11werefirstlyevaluated.TheconstituentsofindividualorganicacidsandthedistributionofthefeedingCODoverthedifferentdigestionproductsatvariouspHlevelsweresubsequentlyinvestigated.Theresultsshowedthathigherhydrolysisandacidogenesisrateswereobtained,whenthepHvaluewaskeptat7.Andabout86%ofTOCand82%ofCODweresolubilizedafter9daysandthemaximumVFAconcentrationof36g·L-1wasachievedontheforthday.WhenthepHvaluewaskeptat7,lacticacidconcentrationwasrelativelylow,andaceticandbutyricacidwerepredominantVFA,whilepropionicacidtookarelativelylittlepart.ControllingpHat7increasedthehydrolysisandacidogenesisratesofkitchenwastesandprovidedthesubstratesfavorabletothesubseq