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primary topic: Enhancement of anaerobic digestibility of waste activated sludge using photo-Fenton pretreatment

Enhancement of anaerobic digestibility of waste activated sludge using photo-Fenton pretreatment
type: AcademicArticle
type: Article
abstract: Biological treatments, such as activated sludge process, are common methods to treat municipal and industrial wastewaters. However, they produce huge amounts of waste activated sludge (WAS). The excess sludge treatment and disposal are a challenge for wastewater treatment plants due to economic, environmental, and regulatory factors. In this study, photo-Fenton pretreatment (oxidation using hydrogen peroxide and iron catalyst aided with UV light) was optimized using response surface methodology (RSM) and central composite design (CCD) to determine the effects of three operating parameters (H2O2 dosage, H2O2/Fe2+ molar ratio, and irradiation time) on disintegration and dewaterability of WAS. MLVSS removal, capillary suction time (CST) reduction, sCOD, and EPS were obtained as 70, 25, 12,000 mg/L, and 500 mg/L, respectively, at the optimal conditions, i.e., 725 g H2O2/kg TS, H2O2/Fe2+ molar ratio 80, and irradiation time 40 min. Two batch-fed completely mixed mesophilic anaerobic digesters were then operated at 15-day solid retention time (SRT) and 37 Â±Â 0.5 °C to compare the digestibility of untreated and photo-Fenton pretreated sludge in terms of volatile solids (VS) reduction, COD removal, and biogas production at steady-state operations. Photo-Fenton pretreatment followed by anaerobic digestion of WAS was very effective and yielded 75.7 total VS reduction, 81.5 COD removal, and 0.29â��0.31 m3/kg VSfed·d biogas production rate, compared to 40.7 total VS solid reduction, 54.7 COD removal, and 0.12â��0.17 m3/kg VSfed·d biogas production rate for control. Thus, photo-Fenton can be a useful pretreatment step in sludge management. © 2017, Springer-Verlag GmbH Germany.
date: 2017
volume: 24
issue: 35
is part of: Environmental Science and Pollution Research
status: peerReviewed
status: published
author list: authors
type: EPrint
type: ArticleEPrint
is part of: repository

Springer Verlag
type: Organization

Environmental Science and Pollution Research
type: Collection
issn: 09441344

A.A.L. Zinatizadeh
type: Person
given name: A.A.L.
family name: Zinatizadeh

J.-W. Lim
type: Person
given name: J.-W.
family name: Lim

G.C. Heng
type: Person
given name: G.C.
family name: Heng

Y.-C. Ho
type: Person
given name: Y.-C.
family name: Ho

M.H. Isa
type: Person
given name: M.H.
family name: Isa

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primary topic: Enhancement of anaerobic digestibility of waste activated sludge using photo-Fenton pretreatment