NaClO和PAA对医院污水MBR污泥消毒的研究_张景丽_顾平_张光辉

NaClO和PAA对医院污水MBＲ污泥消毒的研究张景丽1，2，顾平1，张光辉1(1．天津大学环境科学与工程学院，天津300072;2．天津城建大学天津市水质科学与技术重点实验室，天津300384)摘要:使用次氯酸钠和过氧乙酸(PAA)对处理医院污水的MBＲ污泥进行消毒试验。以细菌总数、总大肠菌群数和粪大肠菌群数作为消毒指标，研究发现两种消毒剂均有效，前者效果略优于后者。当污泥浓度(MLSS)为6000mg/L、接触时间为1h、消毒剂投量＞200mg/L时，随消毒剂投量的增大，对细菌总数和总大肠菌群数的对数去除率的增幅变小，对粪大肠菌群数的对数去除率的增幅则比前二者大，可见细菌、总大肠菌群抵抗两种消毒剂的能力均高于粪大肠菌群。次氯酸钠和过氧乙酸投量较大时消毒作用均主要发生在前10min，之后过氧乙酸的消毒作用仍然增加，而次氯酸钠的消毒作用基本保持不变;次氯酸钠的消毒作用明显比过氧乙酸快，但消耗量大。关键词:医院污水;MBＲ;污泥消毒;次氯酸钠;过氧乙酸中图分类号:X703文献标识码:C文章编号:1000－4602(2014)03－0087－05基金项目:国家高技术研究发展计划(863)项目(2003AA601130);国家自然科学基金资助项目(51078265)SodiumHypochloriteandPeraceticAcidforDisinfectionofSludgefromMembraneBioreactorTreatingHospitalWastewaterZHANGJing-li1，2，GUPing1，ZHANGGuang-hui1(1．SchoolofEnvironmentalScienceandEngineering，TianjinUniversity，Tianjin300072，China;2．TianjinKeyLaboratoryofAquaticScienceandTechnology，TianjinChengjianUniversity，Tianjin300384，China)Abstract:Twodisinfectants，sodiumhypochloriteandperaceticacid(PAA)，wereusedtotreatsludgefromamembranebioreactortreatinghospitalwastewater．Bothdisinfectantswereeffectiveforkill-ingtotalbacteria，totalcoliformsandfaecalcoliformsintheMBＲsludge，andsodiumhypochloriteper-formedslightlybetterthanPAA．Whenthemixedliquorsuspendedsolids(MLSS)were6000mg/L，thecontacttimewas1h，andthedosageofthetwodisinfectantswasmorethan200mg/L，thelogarithmremovalrateoftotalbacteriaandtotalcoliformswasnolongerincreasedsignificantlywiththeincreaseofthedisinfectantdosage，andthelogarithmremovalrateoffaecalcoliformswasgreaterthanthatoftotalbacteriaandthatoftotalcoliforms，indicatingthattotalbacteriaandtotalcoliformsweremoreresistanttothedisinfectantsthanfaecalcoliforms．ThedisinfectionefficiencyofsodiumhypochloriteandPAAmainlyoccurredinthefirst10min，laterthedisinfectionefficiencyofPAAstillroseandthatofsodiumhypo-chloritechangedlittlewhenusinglargedosageoftwodisinfectants．ThedisinfectionreactionofsodiumhypochloritewasquickerthanthatofPAA，buttheconsumptionofsodiumhypochloritewaslargerthanthatofPAA．Keywords:hospitalwastewater;membranebioreactor(MBＲ);sludgedis