污泥超声处理及其在好氧消化中的应用

环境科学ENVIR0NMENTALSCIENCEVo1．28．No．7Ju1．，2007污泥超声处理及其在好氧消化中的应用李欢，金宜英，聂永丰，李雷，杨海英(1．清华大学环境科学与工程系，北京100084；2．广州铬渣处理新技术工程有限公司，广州510600)摘要：污泥好氧消化工艺可以有效实现污泥的稳定和减量，为了进一步提高好氧消化的效率，促进有机质的降解，在对污泥超声处理性能研究的基础上，考察了不同超声辅助处理手段对污泥好氧消化的影响．结果表明，经1．0W／mL超声处理10min后，污泥上清液中溶解性COD增加了5．4倍，污泥总悬浮固体减少了16％；而经0．05W／mL超声处理10min后，污泥比耗氧速率可提高29％．用这2种超声预处理好氧消化的进泥时，污泥有机质降解率没有明显改变，但用1．0W／mL超声处理好氧消化的回流污泥时，污泥有机质降解率提高了15％，而且消化污泥的沉降性能良好，上清液中有机质含量增加很少，因此，后者可以用于改善污泥好氧消化工艺．关键词：剩余污泥；好氧消化；超声破解；污泥活性中图分类号：x705文献标识码：A文章编号：0250-3301(2007)07．1512．06UltrasonicSludgeTreatmentandItsApplicationonAerobicDigestionLIHuan，JINYi—ying，NIEYong—feng，LILei，YANGHai—ying2(1．DepartmentofEnvironmentalScienceandEngineering，TsinghuaUniversity，Beijing100084，China；2．ChromeResidueTreatmentTechnologyandEngineeringInc，Guangzhou510600，China)Abstract：Inordertoenhancethedegradationeficiencyofwasteactivatedsludge(WAS)inconventionMaerobicdigestion，variousultrasonicassistedtreatmentmethodswereinvestigatedincludingultrasonicdisintegrationofinfluentsludge，ultrasonicimprovementofinfluentsludgeactivityandultrasonicdisintegrationofreturnsludge．Firstlytheefectsofultrasonicsludgetreatmentwerestudiedtochooseappropriateultrasonicparameters，andthentheexperimentsofaerobicdigestionwithdiferentultrasonictreatmentswerecarriedout．Theresultsshowthat1．0W／mL，10minutesultrasonictreatmentCanincreasesolublechemicaloxygendemand(SCOD)inthesupernatantphaseofsludgesampleby5．4timesanddecreasetotalsuspendedsolid(TSS)by16％；0．05W／mL，10minultrasonictreatmentcanincreasethespecificoxygenuptakerate(SOUR)ofsludgesampleby29％．Thetwokindsofultrasonicinfluentsludgepretreatmentcan’timproveaerobicdigestionefectively．UltrasonicreturnsludgedisintegrationCanenhancethevolatilesuspendedsolid(VSS)degradationratioby15％．Furthermore，thesettlementperformanceofdigestedsludgeisstillgodandthepolutantconcentrationsofsupernatantphaseincreaseslishtly．Soultrasonicreturnsludgedisintegrationisconsideredasthemostappropriateassistedtreatmentmodeforaerobicdigestion．Keywords：wasteactivatedsludge；aerobicdige