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1、亚硝酸盐对聚磷菌厌氧代谢影响摘要：以2种强化生物除磷（EBPR）系统中的活性污泥为研究对象，考察亚硝酸盐对聚磷菌厌氧代谢的影响，结果表明：不同EBPR系统中的聚磷菌对于亚硝酸盐的耐受能力不同。人工配水富集聚磷菌的活性污泥，当亚硝态氮浓度超过10mg/L时，聚磷菌吸收VFA受到抑制，PHA的合成减少，磷酸盐的释放增加；处理生活污水的SBR短程脱氮除磷活性污泥，亚硝酸盐的浓度高达30mg/L时，未对聚磷菌的厌氧代谢造成抑制，但引起异养反硝化菌与聚磷菌竞争VFA，导致PHA合成量和释磷量的减少。富集聚磷菌的活性污泥投加亚硝酸盐后P/VFA增
2、大，说明有亚硝酸盐存在时更多的能量用于VFA的吸收。对2种活性污泥中聚磷菌的荧光原位杂交（FISH）定量分析表明：富集聚磷菌系统中聚磷菌含量达到55%，而短程脱氮除磷系统中为7.6%。关键词：聚磷菌；亚硝酸盐；厌氧代谢；抑制；污水处理中图分类号：X703.1文献标志码：A文章编号：1674-4764（2012）02-0132-06EffectofNitriteonAnaerobicMetabolismofPhosphateAccumulatingOrganisms20ZENGWei,YANGYing-ying,WANGXiang-do
3、ng,LILei,LIBo-xiao,PENGYong-zhen(SchoolofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100124,P.R.China)Abstract:Twoenhancedbiologicalphosphorusremoval(EBPR)sludgeswereusedtoinvestigatetheeffectofnitriteonanaerobicmetabolismofphosphateaccumulati
4、ngorganisms(PAOs).ItisfoundthattoleranceofPAOstonitriteintwosludgesweredifferent.InthesludgewithenrichedPAOsculturestreatingsyntheticwastewater,whennitriteisabove10mg/L,itinhibitsVFA-uptakeofPAOs,leadingtodecreaseofPHAsynthesisandincreaseofphosphaterelease.Inthesludgewi
5、thnitrogenandphosphorusremovalbyshortcutnitrificationtreatingrealdomesticwastewater,anaerobicmetabolismofPAOsisnotinhibitedevenwhennitriteis30mg/L;however,thepresenceofnitriteinanaerobicperiodcausesdenitrifyingbacteriacompeteforlimitedcarbonsourceswithPAOs,resultinginde
6、creaseofPHAsynthesisand20phosphaterelease.FortheenrichedPAOscultures,theratioofP/VFAobviouslyincreaseswhennitriteisaddedinthereactor,indicatingincreasedenergyrequirementforPAOstotakeupVFA.ThequantificationresultsforPAOsintwosludgesusingfluorescencein-situhybridization(F
7、ISH)showthatthePAOslevelis55%intheenrichedPAOscultures,and7.6%inthesludgewithnitrogenandphosphorusremovalbyshortcutnitrification.Keywords:phosphateaccumulatingorganisms(PAOs);nitrite;anaerobicmetabolism;inhibition;wastewaterdisposal强化生物除磷(Enhancedbiologicalphosphorusrem
8、oval，EBPR)作为一种经济可持续的除磷工艺在污水处理厂中得到了广泛的应用。EBPR工艺的实现主要依靠聚磷菌(Phosphateaccumulationorganisms，PAOs)在交替的厌氧/好氧环境中放磷及过量
