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时间:2020-04-21
《pH值对化学-生物混合污泥厌氧发酵释磷的影响-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、中国环境科学2014,34(3):650-657ChinaEnvironmenta1SciencepH值对化学一生物泪tl=t;合口污,‘=,泥匕厌氧发酵释磷的影响张丽丽,李咏梅(同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海200092)摘要:以污水处理厂化学除磷工艺产生的常见化学磷(AIPO4和FePO4)沉淀为研究对象,考察了两种化学磷分别与剩余活性污泥(即生物污泥)混合厌氧发酵过程中化学磷和生物磷的释放情况.结果表明:在纯水中,AIPO在强酸强碱条件下均能释出部分磷,FePO只在强碱条件下才能溶解释磷.在(35±1)℃,不同pH值下将含
2、AIPO4的混合污泥厌氧发酵时,强酸性厌氧发酵能释出较多的化学磷,但微生物活性被抑制,不利于发酵产酸;碱性发酵(pH=10~11)能释出28%~55%的化学磷,43%~49%的生物磷,总释磷量比中性条件下高17.5%~62.7%,同时利于发酵产酸,维持pH10和11时产酸量分别比中性条件高233%和117%;对于含FePO4的混合污泥厌氧发酵,中性条件下即能释放FePO4中40%的磷和生物污泥中50%的磷,释磷量高于pH=l1的碱性厌氧发酵释磷量.关键词:化学磷;混合污泥;厌氧发酵;释磷:pH值中图分类号:X703文献标识码:A文章编号:10006923(20t4)
3、03—0650—08EffectofpHonphosphorusreleasefromchemical—biologicalmixedsludgeduringanaerobicfermentation.ZHANGLi-li,LIYong—mei(StateKeyLaboratoryofPollutionControlandResourcesReuse,CollegeofEnvironmentalScienceandEngineering,Ton~iUniversity,Shanghai200092,China).ChinaEnvironmentalScience,2
4、014,34(3):650~657Abstract:Twochemicalphosphates(AIPOiandFePO4)wereusuallygeneratedduringchemicalphosphorusremovalprocessesinwastewatertreatmentplant.Toinvestigatethereleaseofchemicalphosphatesandbiologicalphosphoruswheneachchemicalphosphatewasmixedwithsurplusactivesludge(biologicalslud
5、ge)respectivelyforanaerobicfermentation,thetwochemicalphosphateswereused.Theresultsshowedthatinpurewater,phosphoruscouldbereleasedfromAIPO~undereitherstrongacidorstrongalkalineconditions,andbereleasedfromFePO4onlyunderstrongalkalineconditions.Foranaerobicfermentationofmixedsludgecontai
6、ningAIPO~at35~1℃,morechemicalphosphatecouldbedissolvedunderstrongacidbutmicrobialactivitywasinhibited,whichwasunfavorabletovolatilefattyacid(VFA)production.Underalkalineconditions(pH10~l1),28%~55%ofthechemicalphosphateand43%~49%ofthebiologicalphosphoruswerereleasedandthetotalreleasedph
7、osphorusamountwas17.5%~62.7%higherthanthoseunderneutralcondition.AlkalineconditionswerealsobeneficialtoVFAproduction;atpH10andpH11,VFAproductionwas233%and117%higherthanthoseunderneutralconditions.respectively.ForanaerobicfeHnentationofthemixedsludgecontainingFePO4,40%ofchemicalphosph
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