纳米CaO_(2)氧化修复苯并噻唑类污染地下水的效果  

Performance of the oxidation of benzothiazole pollutants in groundwater using nano CaO_(2)

作　　者：李王蕊 徐淼鑫 董珍 其布日 LI Wangrui;XU Miaoxin;DONG Zhen;QI Buri(School of Chemistry,Chemical Engineering and Life Science,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学化学化工与生命科学学院,武汉430070

出　　处：《环境工程学报》2025年第2期468-478,共11页Chinese Journal of Environmental Engineering

基　　金：武汉理工大学自主创新研究基金项目(2021IVA074)。

摘　　要：为了探究纳米过氧化钙(nCaO_(2))原位氧化降解地下水中苯并噻唑及其类似物(BTs)的可行性,采用静态批实验与动态柱实验相结合的方法开展了一系列研究,考察了不同条件下的处理效果,明确了修复试剂投加量、地下水pH、背景离子等因素的影响;同时研究了nCaO_(2)在含水层中的迁移分布规律以及Fe^(2+)活化nCaO_(2)对BTs污染含水层的连续动态修复性能。批实验结果表明,在最佳氧化剂/活化剂配比下,3种难降解BTs在1 h后均有明显的降解;在强酸性(pH=3)和中性(pH=7)条件下BTs具有较好的去除效果;水中Cl^(-)和HCO_(3)^(-)离子对BTs降解的影响取决于pH和污染物自身的化学性质。柱实验结果表明,nCaO_(2)在含水层中具有一定的迁移能力,对3种BTs的累计去除率均在70%~80%。模拟含水层地球化学参数(pH、氧化还原电位、溶解氧和Fe^(2+)等)在修复过程中也会发生相应的变化,表明nCaO_(2)能够持续有效地释放O_(2)。In order to explore the feasibility of in-situ chemical oxidative degradation of benzothiazoles(BTs)in groundwater by nano-sized calcium peroxide(nCaO_(2)),a series of studies were carried out by combining static batch experiment and dynamic column experiment.The treatment performances under different conditions were investigated,and the influences of remediation reagent dosage,groundwater pH and background ions were studied.In addition,the migration and distribution of nCaO_(2) in aquifers and the continuous remediation performance of nCaO_(2) activated by Fe^(2+)for BTs-polluted aquifers were studied.The results of batch experiments showed that under the optimal oxidant/activator ratio,the three refractory BTs compounds all degraded obviously after 1 h.The strongly acidic(pH=3)and neutral(pH=7)conditions were beneficial to BTs removal.The effect of Cl^(-)and HCO_(3)^(-)ions in water on the degradation of BTs depends on pH and the natures of contaminants.Column experiments showed that nCaO_(2) can migrate in the aquifer,and the cumulative removal efficiencies of three BTs compounds were all between 70~80%.The corresponding changes in geochemical parameters(pH,oxidation-reduction potential,dissolved oxygen,Fe^(2+),etc.)of the simulated aquifers were also observed during the remediation process,which indicated that nCaO_(2) can release O_(2) continuously and efficiently.

关 键 词：nCaO_(2) 原位氧化 地下水修复 新污染物 类芬顿 

分 类 号：X703[环境科学与工程—环境工程]