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《中南大学学报（英文版）》
>Advanced treatment of biologically pretreated coking wastewater by intensified zero-valent iron process（IZVI） combined with anaerobic filter and biological aerated filter（AF/BAF）
Advanced treatment of biologically pretreated coking wastewater by intensified zero-valent iron process（IZVI） combined with anaerobic filter and biological aerated filter（AF/BAF）
Experiments were conducted to investigate the behavior of the sequential system of intensified zero-valent iron process（IZVI） and anaerobic filter and biological aerated filter（AF/BAF） reactors for advanced treatment of biologically pretreated coking wastewater. Particular attention was paid to the performance of the integrated system for the removal of chemical oxygen demand（COD）, ammonia nitrogen（NH3-N） and total nitrogen（TN）. The average removal efficiencies of COD, NH3-N and TN were 76.28%, 96.76% and 59.97%, with the average effluent mass concentrations of 56, 0.53 and 18.83 mg/L, respectively, reaching the first grade of the national discharge standard. Moreover, the results of gas chromatography/mass spectrum（GC/MS） and gel permeation chromatography（GPC） analysis demonstrated that the refractory organic compounds with high relative molecular mass were partly removed in IZVI process by the function of oxidation-reduction, flocculation and adsorption which could also enhance the biodegradability of the system effluent. The removal efficiencies of NH3-N and TN were achieved mainly in the subsequent AF/BAF reactors by nitrification and denitrification. Overall, the results obtained show that the application of IZVI in combination with AF/BAF is a promising technology for advanced treatment of biologically pretreated coking wastewater.
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