表征发酵产氢活性污泥效能的碘硝基四唑紫-比脱氢酶活性及其检测
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2020-04-23 09:34:59
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AbstractTheratiobetweenMixedLiquorVolatileSuspendedSolid(MLVSS)andMixedLiquorSuspendedSolid(MLSS),thespecifichydrogenproducingratebyMLVSSandtheCODremovalratearenormallyusedtoevaluatethehydrogen-productionefficiencyofanaerobicactivatedsludgeinfermentationprocesses,buttheysufferfromsomedrawbacks.Inordertoevaluatethehydrogen-productionefficiencyofanaerobicactivatedsludgeinfermentationprocesses,adetectionmethodusingiodonitrotetrazoliumchloride(INT)isproposedandoptimizedfordetectingthespecificdehydrogenaseactivityintheflocs.Thecorrelationbetweendehydrogenaseactivityandthespecifichydrogenproductionrateoftheactivatedsludgeisanalyzed.TheresultsshowthattheoptimalconditionsfordetectingINT-dehydrogenaseactivityareasfollows.A2.8mLreactionsystem,including0.3mLsludgesamplewithamixedliquorvolatilesuspendedsolidsof3.5~12.5g/L,1mL19.8μmol/LINTand1.5mLsodiumacetatebufferwithapHof5,isputindarkfor30minunder45℃withoscillation.Concentratedsulfuricacidof98%isusedasthereactionterminationagent,whiletheanhydrousethanolisusedastheextractionsolvent.Theabsorbanceismeasuredat438nm.Thedehydrogenaseactivityoftheactivatedsludgeisveryhighlycorrelatedwithitsspecifichydrogenproductionrate,excellentlyreflectingthehydrogen-producingactivity.Keywordsbio-hydrogen;fermentation;anaerobicactivatedsludge;dehydrogenase;iodonitrotetrazoliumchloride0引言对于以厌氧活性污泥为基础的有机废水发酵法生物制氢系统,目前多用混合液中的挥发性悬浮固体(MixedLiquorVolatileSuspendedSolids,MLVSS)与总悬浮固体(MixedLiquorSuspendedSolids,MLSS)的比值(MLVSS/MLSS)、活性污泥(MLVSS)的比产气(氢)速率(L/(g·d))、COD去除率(%)收稿日期:2009-06-22基金项目:中国高技术研究发展计划(863计划)项目(2006AA05Z109);哈尔滨市科技创新人才研究专项(2009RFXXS004)作者简介:李建政,教授,研究方向为城市水资源与水环境,电子信箱:ljz6677@163.com表征发酵产氢活性污泥效能的碘硝基四唑紫-比脱氢酶活性及其检测李建政,王硕,郑国臣,蒋凡哈尔滨工业大学;城市水资源与水环境国家重点实验室,哈尔滨150090摘要目前,评价有机废水发酵法生物制氢系统产氢效能的指标,一般采用挥发性悬浮固体(MLVSS)与总悬浮固体(MLSS)的比值(MLVSS/MLSS)、MLVSS的比产气(氢)速率及COD去除率等参数,但均存在不同程度的缺陷。为寻求评价发酵制氢活性污泥系统产氢效能的合理指标,以脱氢酶检测的碘硝基四唑紫(INT)法为基础,以发酵产氢系统的絮状活性污泥为样品,确立并优化了INT-比脱氢酶活性的检测与计算方法,并对比脱氢酶活性与发酵制氢系统的产氢效能进行了相关性分析。结果表明,INT-比脱氢酶活性检测的适宜条件是:在容积为10mL的离心管中,先后加入一定浓度的污泥样品0.3mL
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