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

摘要: 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。

Abstract: 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.