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摘要
A sequential Fe0/S2O8 2- heterogeneous Fenton reaction and biodegradation process was employed for the depth-treatment of coal-chemical engineering wastewater to meet the discharge standard and its operational cost was discussed. The results showed that COD and color removal efficiency of 56% and 50% was achieved at initial pH of 6.8, Fe0 of 2 g?L-1 and S2O8 2- of 15 mmol?L-1, respectively in the Fe0/S2O8 2- Fenton reaction. According to gas chromatography-mass spectrometer (GC-MS) and gas chromatography (GC) analysis, the recalcitrant aromatic compounds were effectively decomposed into low-molecular-weight organic acids. These acids were resistant to the Fe0/S2O8 2- Fenton reaction, while they were effectively eliminated in the sequential air lift reactor (ALR), resulting in a further decrease of COD and color concentration from 150 to 48 mg?L-1 and from 75 to 25 times, respectively. A total COD and color removal efficiency of 86% and 83% could be achieved after the above sequential process. Since high performance was achieved at an original pH of 6.8 and ferric ion was below 9 mg?L-1 during the Fe0/S2O8 2- Fenton reaction, sludge disposal could be avoided after the reaction. It indicated that this combined process is a promising and cost-effective way for the depth-treatment of coal-chemical engineering wastewater to satisfy discharge requirements. ? 2018, Science Press. All right reserved.
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