SPRR工艺回收养猪废水营养元素研究

农业环境科学学报2007，26(6)：2173—2178JoumalofAgro·EnvironmentScienceSPRRT艺回收养猪废水营养元素研究彭剑峰，宋永会，袁鹏，袁芳(中国环境科学研究院水污染控制技术科技创新基地，北京100012)摘要：采用磷酸铵镁(MAP)结晶法，研究序批式磷回收反应器(SPRR)从养猪废水厌氧消化液中回收营养元素的能力，初步确定了SPRR反应器的运行参数，考察了废水组成对反应器运行效果的影响。结果表明，在废水pH=8．5时，SPRR工艺能够有效富集MAP晶体，单个运行周期仅3．6h；养猪废水中适量投加Mg盐能使MAP产量提高约10．5％～11．6％；考虑经济成本，当养猪废水仅用于营养元素回收时，可不投加Mg盐。SPRR工艺可直接从养猪废水厌氧消化液中高效回收营养元素。具有广阔的应用前景。关键词：序批式磷回收反应器；养猪废水厌氧消化液；磷酸铵镁；营养元素中图分类号：X713文献标识码：A文章编号：1672—2043(2007)06—2173—06NutrientsRecoverybySPRRProcessfromPiggeryWastewaterPENGJian·feng，SONGYong-hui，YUANPeng，YUANFang(ScientificandTechnologicalInnovationCenterforWaterPollutionControl，ChineseResearchAcademyofEnvironmentalSciences，Beijing100012，China)Abstract：Whenadoptingthecrystalizationtechnologyofmagnesiumammoniumphosphate(MAP)forPrecoveryfromhighstrengthwastew—ater,fluidbedreactorisusuallyviewed88themostcommonchoice．However,duetoitspoorhydrodynamicsconditions，massesofMAPpar—ticleseaRnotremaininthereactorbutflowoutthesystemwiththeefluent．whichresultinlowerrecoveryeficienciesofphosphorus．Forim—provingtheserecoveryet]iciencies，anewkindofsequencing—batchphosphorusrecoveryreactor(SPRR)，whichcanacceleratethesepara—tioneficienciesofMAPparticlesfromwater,Wasdesigned．ThenutrientsrecoverypotentialofSPRRfromanaerobicdigestionefluentofpiggerywastewaterWasstudied．PrimaryoperationalparametersoftheSPRRweredetermined，andtheinfluencesofpollutioncomponentsontheMAPcrystallizationwereinvestigated．Theresultsshowthatonlythrough3．0haerationstage，theanaerobicdigestionwastewaterCanof-ferappropriateconditionsforMAPcrystallization．ArunningcycleofthisSPRRincludingfivestages，namelyinfluentstage，pHincreasestage，MAPcrystalstage，MAPprecipitationstage，efluentstage，itcanbefinishedonlyin3．6h．TheadditionofMcouldimproveMAPproductionby10．5％～l1．6％；however,consideringthecostofnutrientsrecovery，itisnotnecessarytoaddMgsalt．Exceptsomeions，suchasNH]，POandMd~，therestpollutioncomponentsinanaerobicdigestionefluentofpiggerywastewaterdidnotsignificandyrestrainMAPformation．Inconclusion，thiskindo