附加回流的生物接触氧化工艺净化滇池大清河水质的示范工程研究_张辉

第3卷第2期环境工程学报Vol.3,No.22009年2月ChineseJournalofEnvironmentalEngineeringFeb.2009附加回流的生物接触氧化工艺净化滇池大清河水质的示范工程研究张辉温东辉＊李璐谢曙光(北京大学环境科学与工程学院,北京100871)摘要针对滇池流域污染最为严重的大清河,采用附加回流生物接触氧化工艺(IBCOP)开展河道水体的旁路处理示范工程研究。IBCOP示范工程的设计规模为1000m3/d,HRT为4.75h,在2007年11月至2008年4月冬旱季期间,根据气候和进水水质条件调节回流比,示范工程运行了3种工况。研究结果表明:示范工程对COD和NH+4-N具有较高的去除效果,平均去除率为46.8%和48.8%,高回流比有利于去除NH+4-N;受到低温、低碳源、高进水DO和生物膜生长不佳等因素影响,示范工程对TN去除效果较低,平均去除率为10.2%,调节回流比不能显著改善碳源不足的情况;水绵的吸收和底泥的沉积是示范工程除磷的主要机理,TP平均去除率为17.9%,低TP浓度进水、生物膜的脱落以及高回流比不利于除磷。关键词附加回流生物接触氧化工艺(IBCOP)河道污水去除率示范工程滇池流域中图分类号X703.1文献标识码A文章编号1673-9108(2009)02-0199-06Demonstrationworkofinter-cyclebiologicalcontactoxidationprocessforpurificationofDaqingRiverinDianchiLakewatershedZhangHuiWenDonghuiLiLuXieShuguang(CollegeofEnvironmentalSciencesandEngineering,PekingUniversity,Beijing100871)AbstractDaqingRiveristhemostseriouslypollutedriverintheDianchiLakewatershed.Abypassdem-onstrationworkoftheinter-cyclebiologicalcontactoxidationprocess(IBCOP),withthetreatmentscaleof1000m3/dandtheHRTof4.75h,wasbuiltaroundtheriverbanktopurifytheriverwater.DuringthewinterdryseasonfromNov.2007toApr.2008,threesetsofconditionsofthedemonstrationworkwereoperatedbyregula-tingcyclingratiobasedontheinfluentqualitiesandclimaticconditions.TheresultsshowedthattheIBCOPdem-onstrationworkkeptbetterremovalefficienciesforCODandNH+4-N,andtheaverageremovalrateswere46.8%and48.8%respectively.Thehighercyclingratio(150%)wasfavorableforremovalofNH+4-N.TheaverageremovalrateofTNwasloweras10.2%,owingtothenegativeimpactsoflowtemperature,carbonsourceshort-age,higherDOleveloftheinfluent,andlooseandporousbiofilm,regulatingcyclingratiocouldnotimprovetheconditionofcarbonsourceshortageremarkably.TheabsorptionbySpirogyrasp.anddepositionofsludgewerethemaincausesofTPremovalandtheaverageremovalrateofTPwas17.9%,lowTPconcentrationofinfluent,detachmentofbiofilmandhighercyclingratioweredetrimentalforTPremoval.Keywordsinter-cyclebiologicalcontactoxidationprocess(IBCOP);riverwater;removalrate;demon-strationwork;DianchiLakewatershed基