研究报告

  • 颉亚玮,蒋毅恒,徐冉云,王涵,张奔,刘宏远.含Br-废水高级氧化过程AOX生成特性研究[J].环境科学学报,2022,42(6):111-120

  • 含Br-废水高级氧化过程AOX生成特性研究
  • Characteristic of AOX formation during advanced oxidation of Br--containing wastewater
  • 基金项目:国家自然科学基金项目(No.51808313,52070111);国家水体污染控制与治理科技重大专项(No.2017ZX07201004)
  • 作者
  • 单位
  • 颉亚玮
  • 浙江工业大学土木工程学院,杭州 310023
  • 蒋毅恒
  • 浙江工业大学土木工程学院,杭州 310023
  • 徐冉云
  • 清华大学环境学院,北京 100084
  • 王涵
  • 浙江工业大学土木工程学院,杭州 310023
  • 张奔
  • 浙江工业大学土木工程学院,杭州 310023
  • 刘宏远
  • 浙江工业大学土木工程学院,杭州 310023
  • 摘要:在焦化废水中投加Br-模拟含Br-难降解废水,研究UV/H2O2和UV/PDS两种高级氧化工艺在实现TOC优化去除条件下可吸附有机卤素(Adsorbable Organic Halogens,AOX)的生成特性.通过响应曲面法优化反应条件,实现废水中TOC高效去除,但Br- 浓度从50 mg·L-1增至150 mg·L-1时,UV/H2O2和UV/PDS出水AOX浓度分别从0.56 mg·L-1和0.65 mg·L-1升高至1.44 mg·L-1和1.63 mg·L-1,远高于进水AOX浓度(0.08 mg·L-1);对活性卤代成分(RHS)稳态浓度的模拟结果表明UV/PDS中RHS浓度总体高于UV/H2O2,是造成二者出水AOX浓度区别的重要原因;对废水中有机物分离和分别氧化后发现,分子量在1000~10000Da的有机组分和疏水碱性组分(HOB)更容易在高级氧化过程中形成AOX,Br-浓度为150 mg·L-1时,二者单位TOC的AOX生成量分别达到0.24 mg AOX和0.053 mg AOX(UV/H2O2),以及0.25 mg AOX和0.069 mg AOX(UV/PDS);在高级氧化出水中识别出的有机溴代物多为具有生物毒性的溴代烷烃类和溴代苯胺类,直接排放对受纳水体构成潜在威胁.
  • Abstract:The formation of adsorbable organic halogens (AOX) during treatment of Br--containing refractory wastewater, which was simulated by adding Br- to coking wastewater, by two advanced oxidation processes, UV/H2O2 and UV/PDS, was investigated under the optimized TOC removal conditions. The response surface method was used to optimize the reaction conditions achieving efficient removal of TOC, but when the Br- concentration increased from 50 mg·L-1 to 150 mg·L-1, the AOX concentrations in the UV/H2O2 and UV/PDS effluent increased from 0.56 mg·L-1 and 0.65 mg·L-1 to 1.44 mg·L-1 and 1.63 mg·L-1, respectively, which were much higher than the influent AOX concentration (0.08 mg·L-1). The simulation results of the steady-state concentration of reactive halogenated species (RHS) showed that the RHS concentration in UV/PDS was generally higher than that in UV/H2O2, which was an important reason for the difference in AOX concentration between the two effluents. The results of the experiments on the separation and oxidation of organic matter in the wastewater showed that organic with molecular weights between 1000 Da and 10000 Da and hydrophobic bases (HOB) were easier to form AOX during the oxidation, and their AOX generation per unit TOC reached 0.24 mg AOX and 0.053 mg AOX (UV/H2O2) and 0.25 mg AOX and 0.069 mg AOX (UV/PDS) respectively at a Br- concentration of 150 mg·L-1. Brominated alkanes and brominated anilines were the major brominated organics identified in effluent, which are toxic and pose a potential threat to the receiving water bodies.

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