In this study, electrochemical treatment and application of O3/UV/H2O2 in various combinations were evaluated in respect to their efficiency to depurate mature landfill leachate. Based on preliminary experiments, electrochemical treatment using stainless-steel electrodes at 2 cm gap was performed optimally at 50 mA/cm2 and pH 6, while application of O3 at 120 L/h, UV at 991 J/cm2 and H2O2 concentration of 1 g/L was carried out. Electrochemical treatment and O3/UV/H2O2 under optimal conditions were applied as follows: I) electrochemical treatment, followed by O3/UV/H2O2 and solids precipitation, II) electrochemical treatment, followed by precipitation and then by O3/UV/H2O2 treatment, and III) O3/UV/H2O2, followed by electrochemical treatment. A low performance was observed when O3/UV/H2O2 preceding electrochemical treatment. Solids, TKN and total COD (tCON) removal was primarily achieved through electrocoagulation, whereas color and soluble COD (sCOD) reduction was mainly attributed to electrochemical oxidation. Experimental setup I was the most efficient treatment scheme, resulting in tCOD, sCOD, TKN, TSS, SACUV254nm and color number reduction of 73%, 80%, 76%, 79%, 94% and 98%, respectively. Indeed, O3/UV/H2O2 step could be omitted since its effectiveness was restricted during landfill leachate treatment. In conclusion, electrochemical treatment followed by precipitation could result in effective reduction of nutrients and color.

中文翻译：

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电化学和 O3/UV/H2O2 方法在不同组合处理成熟垃圾渗滤液过程中的评价。

在这项研究中，电化学处理和 O3/UV/H2O2 在各种组合中的应用对其净化成熟垃圾填埋场渗滤液的效率进行了评估。根据初步实验，在 2 cm 间隙处使用不锈钢电极进行电化学处理的最佳条件为 50 mA/cm2 和 pH 6，而 O3 的应用速度为 120 L/h，UV 的应用速度为 991 J/cm2，H2O2 浓度为 1 g /L 进行。电化学处理和最佳条件下的 O3/UV/H2O2 应用如下：I) 电化学处理，然后是 O3/UV/H2O2 和固体沉淀，II) 电化学处理，然后是沉淀，然后是 O3/UV/H2O2 处理， III) O3/UV/H2O2，然后进行电化学处理。当 O3/UV/H2O2 在电化学处理之前观察到低性能。固体，TKN 和总 COD (tCON) 的去除主要通过电凝实现，而颜色和可溶性 COD (sCOD) 的减少主要归因于电化学氧化。实验装置 I 是最有效的处理方案，导致 tCOD、sCOD、TKN、TSS、SACUV254nm 和色数分别减少 73%、80%、76%、79%、94% 和 98%。事实上，O3/UV/H2O2 步骤可以省略，因为它的有效性在垃圾渗滤液处理过程中受到限制。总之，电化学处理后进行沉淀可以有效减少营养物质和颜色。sCOD、TKN、TSS、SACUV254nm和色数分别减少73%、80%、76%、79%、94%和98%。事实上，O3/UV/H2O2 步骤可以省略，因为它的有效性在垃圾渗滤液处理过程中受到限制。总之，电化学处理后进行沉淀可以有效减少营养物质和颜色。sCOD、TKN、TSS、SACUV254nm和色数分别减少73%、80%、76%、79%、94%和98%。事实上，O3/UV/H2O2 步骤可以省略，因为它的有效性在垃圾渗滤液处理过程中受到限制。总之，电化学处理后进行沉淀可以有效减少营养物质和颜色。