Abstract
The coking wastewater generally comprises highly concentrated, recalcitrant, and toxic organic pollutants, so its treatment has been of great importance to prevent living beings and their environment from these hazardous contaminations. The treatment of pretreated coking wastewater by flocculation-coagulation, alkali out, air stripping, and three-dimensional (3-D) electrocatalytic oxidation was performed (gap between the used β-PbO2/Ti anode and titanium cathode, 12 mm; mass ratio of Cu-Mn/granular activated carbon (GAC) to effluent, 1:4; cell voltage, 7 V). The results showed that the pH adjusting from 3.7 to 6.1 was necessary for coagulants; alkali out played an important role because it brought up precipitation containing higher fatty acids as well as other contaminants to decrease the chemical oxygen demand (COD) in the effluent, and it had also forced the reduction of ammonia nitrogen (NH3-N) by incorporating with air stripping; for 3-D electrocatalytic oxidation with a bleaching liquid assisting, the initial pH 8.5 of effluent was suitable for Cu-Mn/GAC; moreover, it was considered that its Cu component was dedicated to the decrease of COD and NH3-N, while the Mn component specialized in the decay of NH3-N. The residual COD and NH3-N values in the final effluent with pH 6.5 were 95.8 and 8.8 mg/L, respectively, demonstrating that the whole processes applied were feasible and low in cost.
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Acknowledgments
This work was financially supported by the Initializing Fund of Doctor, Yibin University (No. 2010B11), the National Natural Science Fund for Young Scholars of China (No. 41302088), and the gratitude should be given to the Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education for their valuable helps to this study.
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Wen-wu, L., Xiu-ping, W., Xue-yan, T. et al. Treatment of pretreated coking wastewater by flocculation, alkali out, air stripping, and three-dimensional electrocatalytic oxidation with parallel plate electrodes. Environ Sci Pollut Res 21, 11457–11468 (2014). https://doi.org/10.1007/s11356-014-3124-0
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DOI: https://doi.org/10.1007/s11356-014-3124-0