低温下多模式AAO流程脱氮性能比较_姚重华

第4卷第11期环境工程学报Vol.4,No.112010年11月ChineseJournalofEnvironmentalEngineeringNov.2010低温下多模式AAO流程脱氮性能比较姚重华1王国华2谭学军2李池鸿1张辰2(1.华东理工大学资源与环境工程学院,上海200237;2.上海市政工程研究设计总院,上海200092)摘要利用计算机仿真研究了低温下倒置AAO流程与正置AAO流程的脱氮性能,工艺参数涉及流程进水的流量、TCOD、氨氮、总磷以及污泥回流比、混合液回流比、好氧池溶解氧浓度。发现在13℃时,为使氨氮满足国标1级B,宜选用倒置AAO流程;为使总氮达标,宜采用较高混合液回流比,或考虑选用正置AAO流程;在10℃时,为使氨氮达标,宜选用正置AAO流程,但对于污泥回流比及溶解氧浓度须注意调试;为使总氮达标,倒置、正置均可采用,但要对进水总磷、混合液回流比、污泥回流比及好氧池溶解氧浓度进行仔细监控,难度较大。关键词多模式AAO流程低温脱氮性能计算机仿真中图分类号X703.1文献标识码A文章编号1673-9108(2010)11-2509-06ComparisonbetweennormalandinverseAAOprocessforNremovalatlowtemperaturesYaoChonghua1WangGuohua2TanXuejun2LiChihong1ZhangChen2(1.SchoolofResourceandEnvironment,EastChinaUniversityofScienceandTechnology,Shanghai200237,China;2.ShanghaiMunicipalEngineeringDesignGeneralInstitute,Shanghai200092,China)AbstractAcomparisonofNremovalbehaviorsbetweenthenormalAAOandtheinverseAAOprocessatlowtemperatureswasconductedthroughmodelingandsimulation.Theconditionsforthecomparisoncovertheflowrate,TCOD,ammoniaconcentration,totalphosphorusconcentration,sludgerecycleratio,mixedliquorre-cycleratio,dissolvedoxygenconcentrationinaerationtank.Theresultsshowthat,inordertomeettherequire-mentofgrade1Boftheeffluentstandard,at13℃forremovingammonia,theinverseAAOprocessisbetterthanthenormalAAOprocess,andforremovingtotalnitrogen,highmissedliquorrecycleratioshouldbeconsideredfortheinverseAAOprocess.Andat10℃,forremovingammonia,thenormalAAOwithniceselectionofsludgerecycleratioanddissolvedoxygenconcentrationisbetterthantheinverseAAO,andforremovingtotalni-trogen,thereisnodifferencewhentheinverseorthenormalAAOprocessisapplied,aslongasallconditionsa-bovereferredshouldbemonitoredandcontrolledcarefully.KeywordsmultiplemodeAAOprocess;lowtemperature;nitrogenremoval;computersimulation基金项目:上海市科委基金资助项目(072312003)收稿日期:2009-09-12;修订日期:2009-12-06作者简介:姚重华(1946～),男,教授,主要从事环境工程仿真与控制、水处理化学的研究工作。E-mail:chhyao@ecust.edu.cn污水处理AAO流程有正置与倒置2种运行模式。在倒置模式中,初沉池出水部分流入选择池、部分流入厌氧池,内回流污泥由好氧池流入缺氧池,外回流污泥部分流入选择池、部分流入厌氧池。在正置模式中,初沉池出水全部进入选择池,内回流污泥由好氧池流入缺氧池,外回流污泥部分流入