电芬顿工艺集成实现高负荷厌氧消化剩余污泥。
High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process.
机构信息
Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, BP 1177, Sfax 3018, Tunisia.
INRAE, Université de Montpellier, Laboratoire de Biotechnologie de l'Environnement, 102 avenue des Etangs, 11100 Narbonne, France.
出版信息
Molecules. 2020 Jan 31;25(3):626. doi: 10.3390/molecules25030626.
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.
厌氧消化（AD）是一种最有效的废活性污泥（WAS）处理方法，可实现安全处置。本研究采用电芬顿（EF）预处理来提高 WAS 的沼气潜力，使用低成本的铁电极。评估了预处理对污泥理化特性的影响。经过 EF 预处理后，pH 值、电导率、可溶解性化学需氧量（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。毛细吸水时间（CST）分析强调了 EF 对 WAS 的脱水效果，预处理 30 分钟后 CST 从 429 秒降低到 180 秒。批式消化实验表明，与原污泥（0.08 L/g VS）相比，经过 60 分钟 EF 预处理后，沼气产率提高到 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 预处理污泥半连续发酵过程中，也发现沼气产量有所提高。与原污泥相比，EF 预处理污泥产生的沼气产量最高（0.81 L 沼气/g VS），COD 去除率高达 96.6%，在有机负荷率（OLR）为 2.5 g VS/L 时。结果表明，EF 工艺可以作为一种有效的 WAS 解体方法，在 AD 过程中最大限度地回收生物能。
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