Abstract

Mixing of xenobiotic substances with the household waste decreases the biodegradability of leachate generated from municipal landfill sites. In various parts of the world, where solar energy is pervasive, solar photo Fenton-based pre-treatment of municipal landfill leachate can be considered as a potential pre-treatment method to improve its biodegradability. Therefore, this paper reports a laboratory study conducted to compare the efficiency of Fenton and Solar Photo Fenton processes to pre-treat leachate from municipal solid waste landfill site of Chandigarh, India. The operating parameters such as pH and initial concentrations of reagents (i.e., H₂O₂ and Fe²⁺) were optimized using a three level multivariate Box-Behnken statistical approach in combination with response surface methodology. After 2 h of treatment, at the optimal conditions of pH 3.4, [H₂O₂] = 2.73 g/L and [Fe²⁺] = 63.71 mg/L, 86.21% degradation of Chemical Oxygen Demand (COD) was observed after solar photo Fenton-based treatment. On the contrary, the final COD removal obtained using Fenton process at the optimal conditions, pH 5, [H₂O₂] = 2.66 g/L, [Fe²⁺] = 47.29 mg/L, was 59.19%. Further, this study showed that the Fenton based pre-treatment can enhance the biodegradability of landfill leachate. After pre-treatment, the Biological Oxygen Demand (BOD₅) to COD ratio of landfill leachate improved from 0.13 to 0.57 and 0.49 for solar photo Fenton process and Fenton process, respectively. Findings of this study will trigger the broader interest of the auditory comprising policy makers and scientists to treat the leachate using renewable sources and prevent contamination of groundwater.

中文翻译：

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使用响应面法优化基于Fenton的垃圾渗滤液预处理

摘要

将异种生物物质与生活垃圾混合会降低市政垃圾填埋场产生的渗滤液的生物降解性。在世界各地普遍使用太阳能的地方，可以将基于Fenton的日光照料进行市政垃圾渗滤液预处理视为提高其生物降解性的潜在预处理方法。因此，本文报道了一项实验室研究，比较了Fenton和Solar Photo Fenton工艺对印度昌迪加尔城市固体垃圾填埋场渗滤液进行预处理的效率。操作参数，例如pH和试剂的初始浓度（即，H ₂ O ₂和Fe ²⁺）使用三级多元Box-Behnken统计方法与响应面方法相结合进行了优化。处理2小时后，在最适pH值为3.4的条件下，[H ₂ O ₂ ] = 2.73 g / L，[Fe ²⁺ ] = 63.71 mg / L，观察到化学需氧量（COD）下降了86.21％。基于Fenton的治疗。相反，在最佳条件，pH 5，[H ₂ O ₂ ] = 2.66 g / L，[Fe ²⁺ ] = 47.29 mg / L的条件下，使用Fenton工艺获得的最终COD去除率为59.19％。此外，该研究表明基于Fenton的预处理可以提高垃圾渗滤液的生物降解性。预处理后，生物需氧量（BOD ₅太阳Fenton法和Fenton法的垃圾渗滤液COD比分别从0.13提高到0.57和0.49。这项研究的结果将引起包括决策者和科学家在内的听觉的广泛兴趣，以使用可再生资源处理渗滤液并防止地下水污染。