臭氧氧化法深度处理生活垃圾焚烧厂沥滤液

采用臭氧氧化法对生活垃圾焚烧厂沥滤液经生化处理后的废水(称沥滤液生化处理水)进行深度处理。实验结果表明,COD降解速率随废水pH的提高明显增加,其中pH=10.5时的COD降解速率常数约为pH=4时的5.8倍。在臭氧投量为52.92 mg/min、pH=10.5的条件下反应70 min后,UV254和COD去除率分别达到84.7%和59.3%。向反应体系投加叔丁醇后COD去除率下降了约15%,由羟自由基氧化去除的COD占总COD去除量的26.7%。毒性实验结果表明,沥滤液生化处理水的96 h-EC50为38%,经臭氧氧化进一步处理后出水的96 h-EC50为77%,表明经臭氧深度处理后沥滤液生化处理水的毒性明显降低。

Advanced treatment of leachate from MSW incineration by ozonation

Leachate from municipal solid waste (MSW) incineration was advanced treated by ozonation after biological treatment. The results showed that, the constant of COD degradation rate increased with the increase of pH value obviously. The rate constant at pH=10.5 was 5.8 times as high as that at pH=4. When the ozone dosage was 52.92 mg/min, the pH value was 10.5 and the reaction time was 70 min, the removal efficiencies of UV₂₅₄ and COD were 84.7% and 59.3%, respectively. COD removal efficiency decreased about 15% by the addition of tert-butyl alcohol(TBA) in the reaction system. The COD removed by hydroxyl radical oxidation accounted for 26.7% of the total COD removal quantity. The toxicity experiment results showed that 96 h-EC₅₀ of the influent was 38% and 96 h-EC₅₀ of the effluent after ozonation was 77%. This fact demonstrates that the toxicity of the wastewater after ozonation could be reduced markedly.