褐煤气化废水生化尾水深度处理实验研究

THE ADVANCED TREATMENT OF BIOCHEMICAL EFFLUENTS OF LIGNITE GASIFICATION WASTEWATER

采用等离子体技术对褐煤气化废水生化尾水进行了深度氧化实验研究,考察了输入功率(P),反应温度(T),初始p H,反应时间(t)对生化尾水色度、COD、UV254、UV410、UV436去除率的影响,并对深度处理前后废水的可生化性进行了研究。结果表明,各因素对等离子体深度处理效果的影响大小顺序为输入功率>反应时间>反应温度>初始p H。在最优条件下,色度、COD、UV254、UV410、UV436的去除率分别达到了93.8%、31.3%、67.2%、86.5%和87.1%。对深度氧化后的废水B/C进行测定并进行二次生化,结果表明,深度氧化后废水B/C比达到0.38,可生化性显著提高,出水COD稳定在80 mg/L左右,色度8倍,达到一级排放标准(GB 8978-1996)。

Plasma technology was used in the advanced oxidation experiments of biochemical effluents of lignite gasification wastewater. The effect of input power,reaction temperature,initial p H and reaction time on the removal of chroma,COD,UV254,UV410,UV436 of biochemical effluents of lignite gasification wastewater were investigated,also with the biodegradability before and after advanced treatment. The results show that the order of the effects of each factors on advanced treatment was input power 〉reaction time 〉reaction temperature 〉initial pH. Under the optimal conditions,the removal rate of chroma,COD,UV254,UV410,UV436 reached 93.8%,31.3%,67.2%,86.5% and 87.1%,respectively. The B/C of the effluents of advanced oxidation were measured and then treated by secondary biochemical process,the results showed that the biodegradability of the wastewater was 0.38,which was significantly increased after advanced oxidation. COD,chroma of the effluents were about 80 mg/L,8 dilution,respectively,which met the requirements of national integrated wastewater discharge standard（GB 8978-1996）.