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High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process

机译：电-芬顿法一体化高速厌氧消化活性污泥

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摘要

Anaerobic digestion (AD), being the most effective treatment method of waste activated sludge (WAS), allows for safe disposal. The present study deals with the electro-Fenton (EF) pretreatment for enhancing the WAS biogas potential with low-cost iron electrodes. The effect of pretreatment on the physicochemical characteristics of sludge was assessed. Following EF pretreatment, the pH, conductivity, soluble chemical oxygen demand (SCOD), and volatile fatty acids (VFA) increased to 7.5, 13.72 mS/cm, 4.1 g/L, and 925 mg/L, respectively. Capillary suction time (CST) analysis highlighted the dewaterability effect of EF on WAS, as demonstrated by the decrease in CST from 429 to 180 s following 30 min of pretreatment. Batch digestion assays presented an increase in the biogas yield to 0.135 L/g volatile solids (VS) after 60 min of EF pretreatment in comparison to raw sludge (0.08 L/g VS). Production of biogas was also found to improve during semi-continuous fermentation of EF-pretreated sludge conducted in a lab-scale reactor. In comparison to raw sludge, EF-pretreated sludge produced the highest biogas yield (0.81 L biogas/g VS) with a high COD removal rate, reaching 96.6% at an organic loading rate (OLR) of 2.5 g VS/L. d. Results revealed that the EF process could be an effective WAS disintegration method with maximum recovery of bioenergy during AD.
机译：厌氧消化（AD）是最有效的废物活性污泥（WAS）处理方法，可以安全处理。本研究涉及利用低成本铁电极增强WAS沼气潜力的电芬顿（EF）预处理。评估了预处理对污泥理化特性的影响。经过EF预处理后，pH，电导率，可溶性化学需氧量（SCOD）和挥发性脂肪酸（VFA）分别增加到7.5、13.72 mS / cm，4.1 g / L和925 mg / L。毛细管抽吸时间（CST）分析突出了EF对WAS的脱水性，预处理30分钟后CST从429降低到180 s证明了这一点。与原始污泥（0.08 L / g VS）相比，在EF预处理60分钟后，分批消化分析显示沼气产量增加至0.135 L / g挥发性固体（VS）。在实验室规模的反应器中进行的EF预处理污泥的半连续发酵过程中，沼气的生产也得到了改善。与原始污泥相比，经过EF预处理的污泥产生的沼气产量最高（0.81 L沼气/ g VS），COD去除率高，在2.5 g VS / L的有机载量（OLR）下达到96.6％。 d。结果表明，EF过程可能是一种有效的WAS分解方法，在AD期间可最大程度地回收生物能。

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