羟基自由基氧化降解水中二-甲基异莰醇

发布时间：2018-05-26 04:44

  本文选题：二-甲基异莰醇 + 羟基自由基　； 参考：《中国环境科学》2017年11期

【摘要】：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.
[Abstract]:Dimethyl isocamphene 2-MIB) is a kind of saturated tertiary alcohols produced by cyanobacteria and actinomycetes, which has a bridge ring structure, and has an abominable earthy mildew in water, which is difficult to be oxidized by conventional water treatment technology. Hydroxyl radical was produced by atmospheric pressure ionization discharge to degrade 2-MIB. The dose-effect and time-effect relationship of oxidant were determined. The intermediate products of 2-MIB oxidation degradation were analyzed by GC-MS and the mechanism of oxidative degradation was inferred. The results showed that for 2-MIB with initial concentration of 150300ng/L, the removal rates of contact reaction were 96% and 97.6s respectively by adding total oxidant TRO 1.8g / L (2.3mg / L), and the residual concentration was lower than 10ng / L (lower than the threshold of human sniff). The removal efficiency of 2-MIB was obviously decreased after adding OH quenching agent TBA in 2-MIB water. It was proved that 2-MIB was mainly degraded by oxidation. In addition, the analysis of intermediate products in the process of oxidative degradation shows that OH can destroy the bridge ring structure of 2-MIB and finally mineralize to produce CO_2 and H _ 2O _ 2.
【作者单位】： 大连海事大学轮机学院环境工程研究所;厦门大学环境与生态学院海洋生物资源开发利用协同创新中心;
【基金】：国家科技支撑计划项目(2013BAC06B01,2013BAC06B02) 国家重大科研仪器研制项目(NSFC:61427804) 科技部创新人才推进计划重点领域创新团队(2015RA4008) 辽宁省重点实验室基础研究项目(LZ2015008)
【分类号】：TU991.2
，

本文编号：1935984