城市污水厂减少外碳源投加量的研究_滕荣国

书城市污水厂减少外碳源投加量的研究滕荣国1，庄新民2(1．金坛市自来水公司，江苏金坛213200;2．金坛市住房和城乡建设局，江苏金坛213200)摘要:2013年1月—3月，在金坛市第一污水处理厂进行了减少外加碳源(甲醇)投加量的试验研究。结果表明:将甲醇投加点从A2/O池厌氧段进水口调整至缺氧段后，甲醇全部用于反硝化，减少了厌氧段对外加碳源的消耗，甲醇日均用量较去年同期减少约45．9%。同时，甲醇用量减少后，出水各项水质参数均能达标，且对TN的平均去除率达到50．3%。根据生物脱氮除磷理论调整内回流去向，严格保持厌氧段、缺氧段的DO范围，使硝化液全部回流至缺氧段进行反硝化，提高了反硝化效率;并且消除了硝酸盐对厌氧释磷的抑制，聚磷菌在厌氧段释磷、好氧段吸磷的能力明显增强，提高了生物除磷效果。通过对不同回流比时脱氮效果的分析，内回流比在200%、300%时出水TN值均能达到一级A标准，但内回流比为300%时的脱氮效果较200%时的好，且反硝化时间充足，故300%的内回流比更适合该污水厂生产运行需求。关键词:甲醇;投加点;内回流比;投加量中图分类号:X703文献标识码:C文章编号:1000－4602(2013)21－0065－04StudyonＲeductionofCarbonSourceDosageforSewageTreatmentPlantTENGＲong-guo1，ZHUANGXin-min2(1．JintanCityWaterSupplyCo．，Jintan213200，China;2．JintanHousingandUrbanConstructionBureau，Jintan213200，China)Abstract:Anexperimentalstudyonthereductionofexternalcarbonsource(methanol)dosagewascarriedoutinJintanFirstSewageTreatmentPlantfromJanuarytoMarch2013．TheresultsshowedthatafterchangingdosingpointsofmethanolfromanaerobiczonetoanoxiczoneinA2/Otank，methanolwastotallyusedfordenitrification，withoutanaerobicconsumptionofexternalcarbonsource，andwitha45．9%decreaseindailyaveragedosageofmethanolcomparedwiththesameperiodofthelastyear．Af-terreductioninmethanoldosage，theeffluentqualityparametersallmetthestandards，andtheaverageremovalrateofTNwas50．3%．AccordingtoBNＲtheory，theinternalrefluxratiowasadjusted，theDOrangesofanaerobicandanoxiczonesweremaintainedstrictly，allthenitrificationliquidreturnedtotheanoxiczoneforanoxicdenitrification，whichimprovedthedenitrificationefficiency．Andtheinhibitionofnitratetoanaerobicphosphorusreleasewaseliminated，theabilityofphosphateaccumulatingbacteriaforanaerobicphosphorusreleaseandaerobicphosphorusuptakewasmarkedlyenhanced，andthebiologicalphosphorusremovalefficiencywasimproved．Atbothinternalrefluxratiosof200%and300%，theefflu-entTNcouldmeetthefirstlevelAstandard．However，thedenitrificationefficiencyatrefluxratioof300%wasbetterthanthatatrefluxratioof200%，andthedenitrificationtimewassufficient．Itiscon-cludedthattheinternalrefluxratioof300%ismoresuitab