给水厂不同处理工艺对2-MIB去除效果及影响因素分析  

Removal of odorant 2-MIB by water treatment process

作　　者：李丹杰 黎雷[1] LI Danjie;LI Lei(College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学环境科学与工程学院,上海200092

出　　处：《给水排水》2024年第11期40-47,55,共9页Water & Wastewater Engineering

基　　金：国家重大科技专项(2017ZX07502003-03);国家自然科学基金(51308398,51678420);国家“万人计划”青年拔尖人才项目(2021)。

摘　　要：2-甲基异莰醇(2-MIB)是造成水质嗅味的关键物质之一。自然条件下,其主要来自于藻类等微生物的细胞合成和释放,因此2-MIB在空间上可分为胞外和胞内两部分;另外,2-MIB会与水中溶解性有机物(DOM)因为分子间作用力相互结合,因此又可分为游离态和结合态。上述不同赋存形态对水厂去除效果产生不同影响:预处理(预氧化、活性炭吸附等)可去除部分胞外2-MIB,但预氧化易造成藻细胞的破裂和胞内2-MIB的释放;常规处理(混凝、沉淀、过滤)对藻细胞及胞内2-MIB具有理想去除效果,但对胞外2-MIB的去除有限。深度处理(如纳滤、高级氧化等)能够有效拦截或降解2-MIB,特别是纳滤工艺,对结合态2-MIB具有更好的拦截效果(因为结合后分子变大),但是投资和运行成本较高。在实际水处理过程中,应根据水源水质及2-MIB的赋存形态,合理采用组合处理技术,提高水厂对2-MIB的去除效果。2-Methylisoborneol(2-MIB)is a key compound responsible for the undesirable odor in water,primarily originating from the synthesis and release of algae and other microorganisms under natural conditions.Consequently,2-MIB exists in both extracellular and intracellular forms,and can also interact with dissolved organic matter(DOM)in water,forming both free and bound states due to intermolecular interactions.These varying forms of occurrence significantly influence the removal efficiency in water treatment processes.In the pretreatment stage(such as pre-oxidation and activated carbon adsorption),part of the extracellular 2-MIB can be removed,while pre-oxidation may lead to the rupture of algal cells,thereby releasing intracellular 2-MIB.Conventional treatment(coagulation,sedimentation and filtration)processes are effective at removing algal cells and intracellular 2-MIB,but have limited effectiveness in removing extracellular 2-MIB.Advanced treatment technologies,such as nanofiltration and advanced oxidation,offer more efficient interception and degradation of 2-MIB,with nanofiltration particularly effective in removing bound 2-MIB due to the larger molecular size after binding with DOM.However,the investment and operational costs are relatively high.Therefore,in practical water treatment processes,it is crucial to select appropriate combination treatment technologies based on source water quality and the specific forms of 2-MIB present in order to optimize the removal efficiency of 2-MIB throughout the treatment stages.

关 键 词：饮用水处理厂 2-甲基异莰醇 溶解性有机质 

分 类 号：TU991[建筑科学—市政工程]