高浓度焦化废水的锰矿酸性氧化降解性能。
Degradation performance of high-concentration coking wastewater by manganese oxide ore acidic oxidation.
机构信息
China ENFI Engineering Co., Ltd, China Minmetals, No. 12, Fuxing Road, Haidian, Beijing, China, 100038 E-mail:
College of Chemistry and Chemical Engineering, China University of Petroleum (East China), No. 66, West Changjiang Road, Huangdao District, Qingdao, Shandong, China, 266580.
出版信息
Water Sci Technol. 2022 Jul;86(2):367-379. doi: 10.2166/wst.2022.188.
The degradation of coking wastewater using 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 percentage degradation was obtained of 91.6% chemical oxygen demand measured by potassium dichromate oxidation (COD), 94.7% total nitrogen (TN), 98.3% phenols, 98.2% fatty acid, 89.5% tar, and 98.9% sulphide for the oxidized effluent, simultaneously cogenerating a Mnconcentration of 46.2 g/L for Mn-electrolytic stock solution. Secondly, the transformation analysis of the special chemical group of coking wastewater contaminants illustrated that the employment of manganese oxide ore generated the degradation of low and high molecular weight organics, especially causing polymers to break down into oligomers. Thirdly, the electrochemical characteristics of the interface between wastewater and ore revealed that the contaminant degradation of coking wastewater greatly depended on the oxidation capacity of the surface oxide species, involving a simple answer to the MnO oxidation for small-molecule organic materials and a strengthening response to the MnO·OH oxidation for high-weight molecule organic substances. The treatment of coking wastewater using the Mn-oxide ore acidic oxidation process is an effective and value-added method, which is particularly applicable to high-concentration coking wastewater.
采用锰矿酸性氧化法处理焦化废水。该工作分三个阶段进行。首先，通过降解试验测量了有利的降解条件，在最佳条件下，采用重铬酸钾氧化法（COD）测量的化学需氧量（COD）降解率为 91.6%，总氮（TN）降解率为 94.7%，苯酚降解率为 98.3%，脂肪酸降解率为 98.2%，焦油降解率为 89.5%，硫化物降解率为 98.9%，同时生成 Mn 浓度为 46.2g/L 的 Mn 电解原液。其次，焦化废水特殊化学基团污染物的转化分析表明，锰矿的使用导致了低分子量和高分子量有机物的降解，特别是使聚合物分解为低聚物。第三，废水与矿石界面的电化学特性表明，焦化废水的污染物降解很大程度上取决于表面氧化物种类的氧化能力，这对小分子有机材料的 MnO 氧化有一个简单的答案，对高分子量有机物质的 MnO·OH 氧化有一个增强的响应。采用锰矿酸性氧化法处理焦化废水是一种有效且有价值的方法，特别适用于高浓度焦化废水。
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