H2O2/UV流化床氧化焦化废水尾水中惰性成分的可行性考察

摘要

The tailrace of coking wastewater still have a variety of inert ingredients, which is an environmental risk and further limits its discharge or reuse safety, so 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 reactor, and COD removal and UV254 conversion were investigated under different dosages of H2O2, pH, aeration and light conditions, with TOC as an indicator to evaluate the degree of mineralization, and the oxidation of inert ingredients was analyzed by UV scanning, HPLC, GC/MS, IC. The results showed that under the conditions that the initial molar ratio of H2O2 tO the COD was about 0.22, with slightly acidic and proper aeration, and high light reflection effective conversion of pollutants could be achieved, COD and TOC concentration could be decreased to about 20 mg/L and 10 mg/L respectively. During the process, the long-chain hydrocarbons,nitrogen-containing heterocyclic compounds,benzene and polycyclic aromatic hydrocarbons and other components were effectively transformed and mineralized, some were transformed into small molecule intermediate products, such as acetic acid and others, the toxicity of wastewater was greatly reduced and the effluent could serve as a source of reuse water.%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H<,2>O<,2>/UV流化床反应器,考察在不同的H<,2>O<,2>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、HPLC、GC/MS、IC等方法分析惰性成分的氧化效果.结果表明:当初始H<,2>O<,2>与COD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,COD和TOC的浓度可分别下降到20 mgm和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.