欢迎来到天天文库
浏览记录
ID:36791568
大小:2.10 MB
页数:70页
时间:2019-05-15
《强化混凝和膜分离技术在饮用水处理中的应用研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要水体中的天然有机物CNOM)在自来水厂氯化消毒过程中会生成对人体有害的消毒副产物,而目前对有机物的去除并没有在传统的处理工艺中受到重视,因此,有必要进行相应的改进。本文首先对我国饮用水处理技术水平现状、存在的主要问题和发展趋势进行了介绍。为了去除源水中的天然有机物从而控制消毒副产物的生成,提出了以强化混凝和膜分离结合工艺来处理饮用水源水的工艺。利用滤膜的物理截留作用提高了颗粒物和微生物的去除效果,从而允许在混凝阶段按去除NOM的最优条件来操作。通过实验,确定了有机物去除效果最佳时几种常用混凝剂的最佳投加剂量,最佳pH值
2、范围为5.5~6.5,并且铁盐混凝剂去除有机物的效果要好于铝盐。对壳聚糖和羧甲基壳聚糖在混凝中的应用进行了实验。微滤膜过滤实验表明膜过滤对有机物有进一步的去除效果,而膜出水的浊度可以稳定保持在饮用水水质卫生规范所要求的1NTU以下。在本实验中强化混凝与膜过滤结合工艺对水中有机物总的去除率可以达到55%~60%左右。最后,结合实验结论,本论文对自来水厂现有处理工艺提出了改造建议。关键词:饮用水,强化混凝,膜过滤,天然有机物AbstractInthechlorinationprocessofwaterworks,thenatu
3、ralorganicmatter(NOM)inrawwaterwillformdisinfectionby-products(DBPs),whichhavebeenfoundtohavedeleteriousimpactonhumanhealth.However'theremovalofNOMhasn’tbeenpaidhighattentionintheconventionaltreatmentprocesses,SOitstillneedscontinuousimprovementaccordinglyFirstly,
4、thispaperreviewedthemainproblemsandtrendofwatertreatmenttechniquesinourcountry.Thenrecommendedthemethodsofusingenhancedcoagulationcombinedwithmembranefiltrationtechnology,whichwasusedtoimprovetheremovalefficiencyofNOManddecreasetheformationofDBPs.Membranefiltersut
5、ilizeaphysicalbarriertoachieveparticleandmicroorganismremoval,thisallo.wsthecoagulationprocesstobespecificallyoptimizedfortheremovalofNOM.ResultsshowedthattheoptimaldosagesoffivekindsofcoagulantsforNOMremovalwereconfirmedwiththeoptimumrangeofpH5.5-6.5,respectively
6、.Inaddition,analysissuggestedtheferriccoagulantshadhigherefficiencyofNOMremovalthanthatofaluminouscoagulants.Theeffectsofchitosanandcarboxymethylchitosanincoagulationprocesswerealsoinvestigated.Themicro—filtrationexperimentsindicatedthatmembranefiltrationcouldincr
7、easetheremovalofNOM,andmaketheturbiditiesoffilteredwaterlessthan1NTU,whichwasrequiredbythesanitarystandardfordrinkingwaterquality.EvidencewaspresentedthattheNOMremovalrateofrawwatercouldbeachievedto55%~60%throughthesynergeticprocessofenhancedcoagulationcombinedwit
8、hmembranefiltration.Intheend,someadvicewasgiveninthispaperinordertoimprovetheprocessesinwaterworksbasedontheexperimentalresults.Keywords:drinkingwater;e
此文档下载收益归作者所有