锰矿石氧化_磷酸铵镁沉淀预处理焦化废水_黄晓鸣

锰矿石氧化-磷酸铵镁沉淀预处理焦化废水黄晓鸣,陈天虎*,潘敏,彭书传,熊长军,常冬寅,何准合肥工业大学资源与环境工程学院,安徽合肥230009摘要:针对焦化废水中含有高浓度CODCr,挥发酚和氨氮的特性,提出锰矿石氧化-磷酸铵镁(鸟粪石)沉淀两步预处理焦化废水的方法.以磷酸、硫酸调节焦化废水pH至112,利用锰氧化物在酸性条件下的强氧化性,氧化去除废水中的挥发酚和硫化物,去除率分别为99%和100%,同时CODCr的去除率达70%,出水pH升高至118;向上述锰矿石处理后的废水投加菱苦土粉(轻烧氧化镁)进行磷酸铵镁沉淀试验.结果表明,在固液比为18gPL,搅拌反应24h后,氨氮以磷酸铵镁沉淀形式得到去除,去除率达9011%,pH升高至914.X射线粉末衍射(XRD)和透射电镜(TEM)对沉淀产物表征分析表明,磷酸铵镁沉淀是在菱苦土颗粒表面形成和生长的.关键词:焦化废水;锰矿石;氧化;菱苦土;磷酸铵镁中图分类号:X70311文献标志码:A文章编号:1001-6929(2009)06-0713-05CokingWastewaterPre-TreatmentbyManganeseOreOxidationandMagnesiumAmmoniumPhosphatePrecipitationHUANGXiao-ming,CHENTian-hu,PANMin,PENGShu-chuan,XIONGChang-jun,CHANGDong-yin,HEZhunSchoolofResourcesandEnvironmentalEngineering,HefeiUniversityofTechnology,Hefei230009,ChinaAbstract:TotreatcokingwastewaterwhichcontainshighconcentrationsofCODCr,volatilephenols,andammonia-nitrogen,atwostepmethodofmanganeseoreoxidation-magnesiumammoniumphosphate(struvite)precipitationwasproposedinthisstudy.First,thepHwasadjustto112usingphosphoricacidandsulphuricacid,thenvolatilephenolsandsulfideinthecokingwastewaterwereremovedbymanganeseoxidesdependingonitsstrongoxidationinacidiccondition.TheremovalefficienciesofCODCr,volatilephenolsandsulfidewere70%,99%and100%,respectively,withpHoftheeffluentincreasingto118.Secondly,magnesiawasaddedtotheabovemanganeseore-treatedcokingwastewatertoperformtheprecipitationexperiment.Theresultsshowedthatammonia-nitrogenwasremovedintheformofmagnesiumammoniumphosphateatasolid-liquidratioof18gPLafter24hoursstirring.Theremovalefficiencyofammonia-nitrogenwas9011%andpHoftheeffluentincreasedto914.ThecharacterizationofthecrystallizedproductbyX-raydiffractionandtransmissionelectronmicroscopyindicatedthatthestruviteformedandgrewonthesurfaceofthemagnesia.Keywords:cokingwastewater;manganeseore;oxidation;magnesia;magnesiumammoniumphosphate收稿日期:2008-10-25修订日期:2008-11-13基金项目:安徽省自然科学基金项目(070415215);中国大洋协会项目(DYXM-115-01-4-07)作者简介:黄晓鸣(1982-),男,福建泉州人,rome-b2@163.com.*责任作者,陈天虎(1962-),男,安徽界首人,教授,博士,主要从事环境矿物学研究,chentianhu168@vip.sina.com目前,