亚硝酸盐对A-2O系统脱氮除磷的影响

中国环境科学2014,34(9)：2231~2238ChinaEnvironmentalScience亚硝酸盐对A2O系统脱氮除磷的影响宋姬晨,王淑莹*,杨雄,彭永臻(北京工业大学,北京市水质科学与水环境恢复工程重点实验室,北京市污水脱氮除磷处理与过程控制工程技术研究中心,北京100124)摘要：在A2O系统中,通过分别向缺氧区和好氧区投加亚硝酸盐的方式,考察和分析了亚硝酸盐的存在对系统脱氮除磷性能的影响.结果表明,系统的硝化、反硝化及除磷性能均对亚硝酸盐的存在比较敏感.亚硝酸盐存在于好氧段时对硝化性能的影响较大,当好氧段亚硝酸盐浓度达到25mg/L时,系统硝化速率仅有5.26mg/(L·h).亚硝酸盐存在于缺氧段时对反硝化性能的抑制作用较大,且当亚硝酸盐长期存在于缺氧段时,系统的反硝化速率降低至11.83mg/(L·h),与正常情况相比下降了60%;亚硝酸盐存在于好氧段时会严重抑制聚磷菌的吸磷能力,系统磷去除率仅有22%.当亚硝酸盐存在于缺氧段时,会引发系统的污泥膨胀问题,导致聚磷菌流失,聚磷菌数量减少到2.02%左右,继而引发系统除磷效果严重恶化.关键词：亚硝酸盐；脱氮除磷；缺氧条件；好氧条件；微生物种群结构中图分类号：X703文献标识码：A文章编号：1000-6923(2014)09-2231-08EffectofnitriteonnutrientremovalinA2Osystem.SONGJi-chen,WANGShu-ying*,YANGXiong,PENGYong-zhen(EngineeringResearchCenterofBeijing,KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100124,China).ChinaEnvironmentalScience,2014,34(9)：2231~2238Abstract：ExperimentoperatedthroughdosingnitritetoaerobicandanoxicconditionsrespectivelyinA2Osystem.Effectofnitriteonnitrogenandphosphorusremovalwasanalyzed.Resultsshowedthatnitrification,denitrificationandphosphorusremovalperformanceofthesystemweremoresensitivetothepresenceofnitrite.Nitriteexistedinaerobicperiodhadmoreinfluenceontheperformanceofnitrification,whennitriteconcentrationinaerobicperiodreachedto25mg/L,nitrificationrateofthesystemwasonly5.26mg/(L·h).Nitriteexistedinanoxicperiodhadmoreinhibitionondenitrificationperformance,whennitriteexistedinanoxicperiodforlongtime,denitrificationrateofthesystemdownto11.83mg/(L·h)thatfallby60%comparedwithnormalcondition.Nitriteexistedinaerobicperiodcouldinhibitthephosphorusabsorptionabilityofphosphorus-accumulatingbacteriaseriouslywithphosphorusremovalrateofthesystemwasonly22%;Whennitriteexistedinanoxicperiod,itcouldcausesludgebulkingprobleminthesystem,leadtothelossofphosphorus-accumulatingbacteria,thenumberofphosphorus-accumulatingbacteriadecreasedtoabout2.02%,whichinturntriggerphosphorusremovalperformancedeterioratedseriously.Keywords：nitrite；nutrientremoval；anoxiccon