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Feasibility of oxidation of inert ingredients in coking wastewater tailrace by H2O2/UV fluidized bed

XIA Fang,WEI Chaohai,WU Chaofei,HU Yun,LUO Hanjin   

  1. School of Environmental Science and Engineering,South China University of Technology,Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,Ministry of Education,Key Laboratory of Pollution Control and Ecological Restoration,Higher Education in Guangdong Province,Guangzhou 510006,Guangdong,China
  • Online:2011-05-05 Published:2011-05-05

H2O2/UV流化床氧化焦化废水尾水中惰性成分的可行性考察

夏 芳,韦朝海,吴超飞,胡 芸,罗汉金   

  1. 华南理工大学环境科学与工程学院,工业聚集区污染控制与生态修复教育部重点实验室,污染控制与生态修复广东省高等学校重点实验室,广东 广州 510006

Abstract:

The tailrace of coking wastewater still have a variety of inert ingredientswhich is an environmental risk and further limits its discharge or reuse safetyso it is necessary to study the feasibility of an advanced in-depth treatment technology. The actual wastewater was treated with a designed H2O2/UV fluidized bed reactorand  COD removal and UV254 conversion were investigated under different dosages of H2O2pHaeration and light conditionswith TOC as an indicator to evaluate the degree of mineralizationand the oxidation of inert ingredients was analyzed by UV scanningHPLCGC/MSIC. The results showed that under the conditions that the initial molar ratio of H2O2 to the COD was about 0.22with slightly acidic and proper aerationand high light reflection effective conversion of pollutants could be achievedCOD and TOC concentration could be decreased to about 20 mg/L and 10 mg/L respectively. During the processthe long-chain hydrocarbonsnitrogen-containing heterocyclic compoundsbenzene and polycyclic aromatic hydrocarbons and other components were effectively transformed and mineralizedsome were transformed into small molecule intermediate productssuch as acetic acid and othersthe toxicity of wastewater was greatly reduced and the effluent could serve as a source of reuse water.

摘要:

焦化废水尾水中残留的多种惰性成分仍然构成环境风险,制约了其安全排放或安全回用,有必要研究可行的深度处理技术。本文以实际废水作为研究对象,采用自行研制的H2O2/UV流化床反应器,考察在不同的H2O2投加量、pH值、曝气量及光照条件下对COD去除与UV254转化的影响。以TOC为指标评价其矿化程度,并通过UV扫描、HPLCGC/MSIC等方法分析惰性成分的氧化效果。结果表明:当初始H2O2COD的摩尔比值约为0.22、微酸性与适当曝气、实现光反射时能够得到高效的污染物转化效率,CODTOC的浓度可分别下降到20 mg/L 10 mg/L左右,降解过程中,长链烷烃、含氮杂环化合物、苯系物及多环芳烃等组分被有效转化并矿化,部分转化为小分子中间产物如乙酸等,废水毒性大为降低,可以作为回用的水源。

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