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AuthorFeki, Emna
AuthorBattimelli, Audrey
AuthorSayadi, Sami
AuthorDhouib, Abdelhafidh
AuthorKhoufi, Sonia
Available date2020-09-22T09:24:48Z
Publication Date2020
Publication NameMolecules
CitationE. Feki, A. Battimelli, S. Sayadi, A. Dhouib, S. Khoufi (2020). High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process. Molecules, 25, 626; doi:10.3390/molecules25030626
URIhttp://dx.doi.org/10.3390/molecules25030626
URIhttp://hdl.handle.net/10576/16224
AbstractAnaerobic 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
Languageen
PublisherMDPI AG
Subjectanaerobic digestion; biogas yield; waste activated sludge; electro-Fenton; disintegration; dewaterability
TitleHigh-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process
TypeArticle
Issue Number3
Volume Number25
dc.accessType Open Access


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