酸化破乳-萃取-蒸氨预处理用于催化湿式过氧化氢氧化处理煤气化废水

Acidification demulsion-extraction-steamed ammonia pretreatment for catalytic wet peroxide oxidation of coal gasification wastewater treatment

调酸-萃取-蒸氨工序预处理煤气化废水温度达87~95℃,联合高温催化湿式过氧化氢氧化(catalitic wet peroxide oxidation,CWPO)处理煤气化废水,可显著提高废水可生化性。比较了3%Fe/椰壳炭、3%Fe/Al2O_3在CWPO过程中的催化性能。实验结果表明,在反应条件为80℃、pH0为4、H2O_2加入量为7.8~10.5 mg·L^(-1)、空速(LHSV)为0.5 h-1时,3%Fe/椰壳炭对预处理煤气化出水COD去除率高达60%,对总酚的去除率高达90%以上,H2O_2利用率大于99%,色度由初始1 000倍降至2倍,此外,出水B/C为0.51,达到进入生化处理系统的水质要求。

A method of high temperature CWPO with a combination pretreatment process of acidification demulsion,extraction and steamed ammonia whose effluent presented its temperature as high as 87 to 95 ℃ was investigated to improve the biodegradability of coal gasification wastewater. Compared 3% Fe/Al2O3 and 3% Fe/SAC,over 60% of COD and 90% of the total phenol could be removed under the optimized condition（temperature of80 ℃,pH0 of 4,H2O2 of 7. 8 to 10. 5 mg·L^-1,LHSV of 0. 5 h^-1） with 3% Fe/SAC for the pretreatment of coal gasification effluent. COD removal rate as high as 60%,the total phenol removal rate as high as 90%above,the H2O2 utilization rate was more than 99% and chromaticity by initial 1 000 times down to 2 times,in addition,the effluent could reach the requirements of water quality standard for biochemical treatment system due to its high biodegradability as B/C = 0. 51.