Use of Manganese/Silicon Tailing Waste for Coking Wastewater Treatment: Evaluation of Phenol and Phenylamine Removal Efficiencies
2015
Liu, Hongbo | Gao, Saisai | Zhu, Mengling | Zhen, Biao | Pan, Ding
Industrial production of manganese/silicon ore has generated a large number of tailing wastes which are difficult to dispose. A new method treating coking wastewater was proposed using the manganese/silicon tailing waste and demonstrated with good performances: the chemical oxygen demand (COD) removal rate was around 60 % without pH and temperature adjustment, with a reasonable reaction time of 2.5 h and tailing dosage of 0.2 g/L; while phenylamine was eliminated with a removal rate as high as 99 and 61.6 % for synthetic and real coking wastewater, respectively. Experimental results indicated that the removal of organic pollutants was mainly realized through chemical adsorption and/or oxidation by oxide components inside the tailing, rather than by physical adsorption. Operational parameters such as tailing dosage, reaction time, and temperature were optimized. Acid conditions were found to be favorable to remove the selected model organic pollutants, i.e., volatile phenols and phenylamine. Fortunately, the optimistic wastewater pH for COD removal was found to be around 7.0, right within the range of influent pH for real coking wastewater. The new method can treat coking wastewater and reuse mining tailing wastes simultaneously.
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