几种典型皮革复鞣剂的生物降解性分析

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1、采用COD，o法和呼吸曲线法，研究了污泥驯化后质量浓度为1500mg／L的中小相对分子质量丙烯酸复鞣剂DT-R521和中大相对分子质量丙烯酸复鞣剂DT-R548的生物降解性，并且与污泥驯化前进行了比较。结果表明：活性污泥经驯化后，两种丙烯酸复鞣剂的生物降解性均有所提高。COD30法得到：污泥驯化前后，DT-R521的最终生物降解率均大于DT-R548的最终生物降解率。污泥驯化后，两种复鞣剂的最终生物降解率均有了较大幅度的提高，DT-R521的最终降解率提高了38．79％，DT-R548的最终降解率提高了39．71％。由呼吸曲线法得到：污泥驯化前后，DT-R52

2、1的BOD5均大于DT-R548的BOD5。并且，污泥驯化后，两种复鞣剂的BOD5均有了较大幅度的提高，中小相对分子质量丙烯酸复鞣剂DT-R521的BOD5提高了21．92％，中大相对分子质量丙烯酸复鞣剂DT-R548的BOD5提高了23．10％。关键词：芳香族合成鞣剂DT-R7299，丙烯酸复鞣剂DT-R．521，丙烯酸复鞣剂DT-R548，生物降解，COD30法，呼吸曲线法ⅡSTUDYoNTHEBIODEGRADABILITYoFSoMEⅪNDSOFTYPICALLEATHERRETANNINGAGENTABSTRACTThemethodsofCOD30，

3、respiratorycurvewereadoptedtoevaluatethebiodegradabilityofDT-R7299aromaticretanningagentwhichwasusedasthesubstrateofmicroorganism．ThemainresultsobtainedbythemethodofCODsowereasfollows：WhentheconcentrationofsubstrateWasO-qOOOmg／L，sludgeconcentrationwas1000mg／LandpHWas7，thebiodegradat

4、ionrateof750mg／LDT-R7299Wasthemostas66．76％．Themethodofrespiratorycurvesshowedthat：Whentheconcentrationofsubstratementionedabove，therespiratorycurvesofthesubstratewereabovethecurveofendogenous，whichindicatedthatthesubstratehasnoinhabitingeffectonmicroorganism，andWhentheconcentrationo

5、fthesubstratewas750mg／L，theutilizationofthesubstratebymicroorganismwasthemost．Moreover'asindicatedintherespiratorycurves，theeffectofpH，sludgeconcentrationandsalinityonthebiodegradabilityofthesubstratewasobvious．Undertheexperimentalconditions，whentheconcentrationofthesubstratewas750m

6、g／L，pHWas8，thesludgeconcentrationWas3000mg／LandsalinityWasO．5％，thebiodegradabilityofthesubstratewasthebest．ThemethodsofrespiratorycurveandCODsowereadoptedtoevaluatethebiodegradabilityofacrylicretanningagentDT-R521witllmediumandsmallrelativemolecularmass，whichwasusedasthesubstrateofm

7、icroorganism．Themainresultsobtainedbythemethodofrespiratorycurvewereasfollows：Whentheconcentrationofsubstratewas0-3000mg／L，therespiratorycurvesofthesubstratewereundertheCUrveofendogenous，whichshowedthatthesubstratehasinhabitingeffectonmicroorganism。晒entheconcentrationofthesubstrateW

8、as1500mg／L，theutili