煤化工含盐废水中超高浓度COD去除

Removal of Ultra-High Concentration COD in Salinity Wastewater from Coal Chemical Industry

为了对某煤化工厂废水浓缩段的超高浓度水样进行深度处理,本文采用了臭氧催化氧化的方法,从多种商用催化剂中筛选出锰系金属氧化物催化剂,并优化其臭氧催化氧化反应条件,实现有机物的高效去除。结果表明,对TDS~40,000 mg/L、COD~3000 mg/L的废水,在有效接触时间2 h、O3的质量浓度为30 mg/L的反应条件下,COD去除率稳定在50%左右。此外,考察了催化剂用量、含盐量、H2O2用量等对有机物的去除率和矿化率影响,结果表明适当提高催化剂用量、降低含盐量或添加H2O2有利于有机物的去除,为现场工艺提供一定参考。

This study used advanced oxidation processes to deeply degrade the coal chemical industry wastewater with ultra-high COD concentration. And the manganese based metal oxide was screened out from catalytic ozonation catalysts. The effects of catalyst dosage, salt content, H2O2 content etc. on COD removal efficacy were examined to optimize the conditions of catalytic ozonation reaction. The results showed that for wastewater containing TDS~40,000 mg/L and COD~3000 mg/L, the COD removal rate was about 50% under the reaction conditions of 2 h reaction time and 30 mg/L ozone concentration. Meanwhile, the increased catalyst amount and decreased inorganic salt ions were beneficial to catalytic degradation. The research findings will provide some references for the on-site process.