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二-甲基异莰醇(2-MIB)是一种由蓝绿藻以及放线菌等微生物产生,具有桥环结构的饱和叔醇,在水中具有令人厌恶的土霉味,常规水处理工艺难以对其氧化降解.利用大气压强电离放电生成羟基自由基(·OH),对2-MIB进行氧化降解,确定了其氧化剂剂量效应、时间效应关系,并利用GC-MS对2-MIB氧化降解过程中间产物的分析,推断其氧化降解机制.结果表明:对初始浓度为150,300ng/L的2-MIB,分别投加总氧化剂TRO 1.8,2.3mg/L,接触反应6s去除率分别为96%和97.6%,处理后残余浓度低于10ng/L(低于人类嗅阈值).在2-MIB水样中加入·OH淬灭剂叔丁醇(TBA)后,2-MIB的去除效果明显降低,证明氧化降解2-MIB的主要为·OH.另外通过对氧化降解过程中间产物分析表明,·OH能破坏2-MIB的桥环结构,并最终矿化生成CO_2和H_2O.
Di-methyl isomeric alcohol (2-MIB) is a saturated tertiary alcohol with a bridged ring structure that is produced by microorganisms such as blue-green algae and actinomycetes, has disgusting moldy taste in water, conventional water treatment The oxidative degradation of 2-MIB was confirmed, and the dose-effect and time-effect relationship of its oxidant was determined, and the oxidation of 2-MIB by GC-MS The results showed that the total oxidants TRO 1.8 and 2.3 mg / L were added to 2-MIB with the initial concentration of 150 and 300 ng / L, respectively, and the removal rates after 6 h of contact reaction were 96 % And 97.6%, respectively, and the residual concentration after treatment was less than 10 ng / L (lower than the human olfactory threshold). The removal of 2-MIB was significantly improved by adding TBA to 2-MIB water samples The results showed that · OH could destroy the bridged ring structure of 2-MIB and eventually produce CO_2 and H_2O.