The degradation of coking wastewater adopted by a manganese oxide ore acidic oxidation was investigated. This work was performed in three stages. Firstly, the advantageous degradation conditions were measured by the degradation tests, and under the optimal conditions it obtained percentages degradation of 91.6% CODcr, 94.7% TN, 98.3% phenols, 98.2% fatty acid, 89.5% tar, and 98.9% sulphide for the oxidized effluent, simultaneously cogenerated a Mn2+concentration of 46.2 g/L for Mn-electrolytic stock solution. Secondly, the transformation analysis of the special chemical group of coking wastewater contaminant illustrated that the employment of manganese oxide ore generated the degradation of low and high molecular weight organic, especially evoked the eupolymer to break down into oligomer. Thirdly, the electrochemical characteristics of the interface between wastewater and ore revealed that the contaminant degradation of coking wastewater much depended on the oxidation capacity of the surface oxide species, involving the toilless answer to the MnO2 oxidation for small-molecule organic matters, and the strengthening response to the MnO·OH oxidation for high-weight molecule organic substances. The treatment of coking wastewater adopted by the Mn-oxide ore acidic oxidation process is an effective and value-added method, which is particularly applicable to high-concentration coking wastewater.

  • The degradation and utilization of coking wastewater adopted by the manganese oxide ore sulphuric acid oxidation process were investigated.

  • A probable degradation pathway of the intractable contaminant of coking wastewater stimulated by the Mn-oxide ore acidic oxidation was presented.

  • The oxidizing capacity and potential of Mn-oxide ore based on the interface reaction for the coking wastewater degradation was revealed.

Graphical Abstract

Graphical Abstract
Graphical Abstract
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