水力空化-Fenton氧化联合超声吸附处理煤气化废水

Treatment of coal gasification wastewater by hydrodynamic cavitation-Fenton oxidation combined with ultrasonic adsorption

采用水力空化-Fenton氧化联合超声吸附处理煤气化废水,考察了单独Fenton氧化及单独水力空化工艺条件,并对Fenton氧化、水力空化和水力空化-Fenton氧化工艺处理过程进行了动力学初探。实验结果表明:在反应时间60 min、废水pH 3.0、Fe2+加入量900 mg/L、H2O2加入量3600 mg/L、空化压力0.4 MPa的条件下,水力空化-Fenton处理煤气化含酚废水的COD和苯酚去除率分别为93.05%和90.29%;进一步采用超声吸附处理后,出水COD和苯酚质量浓度分别为92.9 mg/L和4.5 mg/L,达到GB 8978—1996《污水综合排放标准》三级指标。

The coal gasification wastewater was treated by hydrodynamic cavitation-Fenton oxidation combined with ultrasonic adsorption.The process conditions of Fenton oxidation and hydrodynamic cavitation were investigated.The dynamics of Fenton oxidation,hydrodynamic cavitation and hydrodynamic cavitation-Fenton oxidation process were studied.The experimental results showed that:the removal rate of COD and phenol by hydrodynamic cavitation-Fenton was 93.05%and 90.29%respectively under the conditions of reaction time 60 min,wastewater pH 3.0,Fe2+amount 900 mg/L,H2O2 amount 3600 mg/L and inlet pressure 0.4 MPa;After further ultrasonic adsorption treatment,COD and phenol mass concentrations of the effluent were 92.9 mg/L and 4.5 mg/L,respectively,which met the third grade standard of GB 8978-1996.