Abstract

The increasing production of oily wastewater as a by-product of industry has become a major environmental problem. Therefore, this article investigates the removal of mineral oil from oily wastewater by a circulating flow sono-electrocoagulation. The Box–Behnken design was used to study the effects of characteristic electrocoagulation and ultrasonic parameters on mineral oil removal efficiency. A total of 34 different experimental setups were performed at a laboratory scale. A reduced cubic regression model with derived coefficients was developed to describe the mineral oil removal rate. The experimental results show that circulating flow sono-electrocoagulation with iron electrodes can effectively reduce mineral oil by 93.3% under the optimum conditions of 10.948 cycles, a current density of 107.12 A m⁻² and a flow rate of 0.468 L s⁻¹. The experimental observations agreed well with the modeled values, and the model was verified experimentally. Under the optimal conditions, the average operating cost was 0.77 EUR/m³.

摘要

作为工业副产品的含油废水的不断增加已成为一个主要的环境问题。因此，本文研究了循环流声电凝聚法去除含油废水中的矿物油。Box-Behnken 设计用于研究特征电凝聚和超声参数对矿物油去除效率的影响。在实验室规模上进行了总共 34 种不同的实验设置。开发了具有导出系数的简化三次回归模型来描述矿物油去除率。实验结果表明，铁电极循环流声电凝聚在10.948次循环、107.12 A m ^{-2电流密度的最佳条件下，可有效减少矿物油93.3%。和0.468 L s -1}的流速。实验观察结果与模拟值吻合良好，并通过实验验证了模型。在最佳条件下，平均运营成本为 0.77 EUR/m ³。