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摘要
Conventional biological treatment of coking wastewater is still hardly meet the COD discharge standard, thus, for biochemical effluent of coking wastewater, the advanced treatment effect and reaction mechanism of microwave-enhanced Fenton technology (915 MHz) were discussed in this paper. The results showed that at Fe2+ dosage of 1.8 mmol?L-1 and H2O2 dosage of 15.6 mmol?L-1, the best COD removal efficiency by Fenton treatment was only 18%, while the COD removal efficiency by microwave-enhanced Fenton technology increased up to 77%, and COD in effluent decreased to 52 mg?L-1, which could meet the pollutants discharge standards in coking chemical industry. By comparing the COD values in the filtered effluents between Fenton and microwave enhanced Fenton reaction, the COD removal efficiency by Fenton reaction could increase from 18% to 72%, which indicated that the sludge phase could further adsorb part of COD. The COD removal efficiency by microwave enhanced Fenton reaction slightly increased to 81%, indicating that oxidation was the main mechanism of microwave enhanced Fenton reaction, which may be related to the acceleration of hydroxyl radical generation through thermal or non-thermal effects of microwave radiation enhancement, and the improvement of the oxidation reaction efficiency. This study shows that microwave enhanced Fenton is an alternative technology for the coking wastewater discharge below the standard, provides reference for the technology selection to treat the coking wastewater and discharge below the standard.
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