臭氧-活性炭工艺深度处理煤制气废水试验研究

Experimental study on advanced treatment of coal gasification wastewater by ozone-activated carbon combined process

以煤制气废水为研究对象,考察臭氧接触时间和臭氧通量对色度和UV254去除效果的影响,研究了臭氧-活性炭工艺在煤制气废水深度处理中的应用效果及影响因素。结果表明,与臭氧直接氧化相比,臭氧催化氧化对色度和UV254的去除效果显著提高,最佳臭氧接触时间为2 h,最佳臭氧通量为5 L/min,在此试验条件下连续运行该工艺深度处理煤化工废水,进水SS浓度和pH值对处理效果有较大影响,CODCr和色度去除率分别为89.95%和86.50%,出水CODCr的质量浓度小于30 mg/L,色度为30度,远优于GB 8978—1996《污水综合排放标准》中一级标准的要求,达到废水回用相关标准的要求。

Taking coal gasification wastewater as the research object, the influence of ozone contact time and flux on chroma and UV254 removal were investigated. The application performance of ozone-activated carbon process in advanced treatment of coal gasification wastewater and the influencing factors thereof were studied. The results indicated that, ozone catalytic oxidation had a better removal effect on chroma and UV~ compared to ozone oxidation. Under the optimal condition that the ozone contact time and flux were 2 h and 5 L/min respec- tively, the said process was continuously run to treat coal gasification wastewater, the results showed that, the treatment effect was obviously affected by influent SS concentration and pH value, the removal rates of CODc~ and chroma were 89.95% and 86.50% respectively, the mass concentration of CODcr in the effluent water was lower than 30 mg/L and the ehroma was 30 Pt-Co unit. The effluent water quality was much higher than the specifica- tion of grade 1 in GB 8978--1996 Integrated wastewater discharge standard, and could meet the requirement of related standard for wastewater reuse.