老龄垃圾渗滤液电化学过氧化(ECP)处理技术

Treatment of Aged Landfill Leachate by Electrochemical Peroxidation(ECP)

老龄垃圾渗滤液(OLL)具有高污染负荷和高处理难度。电化学过氧化(ECP)是一种有效的电化学水处理技术。本研究使用ECP处理OLL,在pH7.9和30mA·cm^(-2)的电流密度下,获得了91.2%的COD和45.3%的TN去除效率。荧光光谱表明,类胡敏酸类大分子有机质被快速去除,荧光强度下降了99.1%。处理过程中絮凝机制和过氧化机制是污染负荷快速去除和OLL急性细胞毒性降低的主要原因,且处理后对发光细菌Vibrio fischeri的光抑制率下降了34.3%。本研究为使用ECP技术处理OLL的实际工程应用提供了重要的理论指导。

The old landfill leachate(OLL) has high pollution loads and treatment difficulty. Electrochemical peroxidation(ECP) is an effective electrochemical water treatment technology. In this study, the removal efficiency of 91.2% COD and 45.3% TN was obtained using ECP treatment of OLL under the pH 7.9 and current density of 30 mA·cm^(-2). The fluorescence spectra during ECP treatment showed that humic-acid like macromolecular organic matter was rapidly removed, and the fluorescence intensity decreased by 99.1%. During ECP treatment, the flocculation and peroxidation mechanisms are the main reasons for the rapid removal of pollution loads, and the reduced acute cytotoxicity. The photoinhibition rate of OLL to Vibrio fischeri decreased by 34.3%. This study provides an important theoretical guidance for the practical engineering application of ECP treatment for OLL.