高硬度含铁含锰地下水的处理
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2020-03-07 10:07:31
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高硬度含铁含锰地下水的处理王晓丹王志军尚庆海。李圭白(1黑龙江工程学院,哈尔滨150050;2哈尔滨供水集团有限责任公司,哈尔滨150010;3黑龙江省城市规划勘测设计研究院,哈尔滨150040;4哈尔滨工业大学市政环境工程学院,哈尔滨150090)摘要黑龙江双城市净水厂原水取用地下水,其含有铁、锰和高硬度,采用石灰软化法、曝气和常规水处理工艺,处理后水中的铁、锰和硬度均达到《生活饮用水卫生标准》(GB5749-2006)。但由于采用石灰软化去除硬度,出水中残存的硬度多以CaCO3和Mg(OH)2沉淀物形式存在,致煮沸水中表面有白色沉淀物薄膜,因此采取在滤后水中加入少量盐酸的方法,使煮沸水中不再出现白色沉淀物薄膜。去除硬度的生产废水中含有高浓度的CaCO。和Mg(OH)沉淀物,直接排放会堵塞下水道和污染接纳水体,故进行了生产废水处理以利于环境保护和污泥回收利用。关键词地下水石灰软化法曝气常规处理工艺铁锰硬度污泥Treatmentofhigh_hardnessgroundwatercontainingironandmanganeseWangXiaodan,WangZhijun,ShangQinghai。,LiGuibai(j.HeilongJiangInstituteofTechnology,Harbin150050,China;2.HarbinWaterSupplyGroupCo.,Ltd.,Harbin150010,China;3.HeilongjiangUrbanPlanningSurveyingDesignandResearchInstitute,Harbin150040,China;4.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China)Abstract:ShuangchengCityWaterTreatmentPlantUSeSgroundwaterasrawwater,whichcontainsiron,manganese,andhigh—hardness.Theprocessesoflimesoftening。aerationandcon—ventionalwatertreatingprocesswereemployedandtheironconcentration,manganeseconcentra—tionandhardnessintreatedwatermettherequirementsofStandardsfordrinkingwaterquality(GB5749—2006).However,thelimesofteningprocesswasusedtoremovethehardness。SOthere—sidualhardnesswasmainlycomposedwithCaCO3andMg(OH)2sediments,whichwouldcausewhitesedimentmembraneonthesurfaceofboiledwater.Afterthehydrochloricacidwasdosedin—tothewaterafterfiltration,thewhitesedimentmembranedisappeared.ThehighconcentrationCa—CO3andMg(OH)2sedimentshouldberemovedfromtheproductionwastewater.Ifitweredischargeddi—rectly,itmightcausethepipeblockingandpollutedthedownstreamreceivingwater.Asaresult,treatingtheproductionwastewaterwouldbeinfavoroftheenvironmentprotectionandsludgereuse.Keywords:Groundwater;Limesofteningprocess;Aeration;Conventionalprocess;Iron;Man—ganese;Hardness;Sludge东北地区松花江沿岸的地下水多含有过量的铁和锰,并且有的地下水硬度甚高,不符合城市居民和工业用水要求,给生活和生产带来严重危害。黑龙江省双城市于2008年建成1座规模为3万m。/d的水厂。该水厂以地下水为水源,水质属高硬度含铁含锰地下水,其水处理工艺不仅要求去除水中的铁和锰,还要求去除水中的硬度。该水厂采用石灰法以及曝气、沉淀、过滤等处理方法和工艺,出厂水质给水排水Vo1.41No.4201517
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