TY  - JOUR
JF  - Environmental Science and Pollution Research
PB  - Springer Verlag
VL  - 24
SN  - 09441344
TI  - Enhancement of anaerobic digestibility of waste activated sludge using photo-Fenton pretreatment
SP  - 27113
EP  - 27124
N1  - cited By 24
Y1  - 2017///
N2  - 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 ± 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.
A1  - Heng, G.C.
A1  - Isa, M.H.
A1  - Lim, J.-W.
A1  - Ho, Y.-C.
A1  - Zinatizadeh, A.A.L.
AV  - none
KW  - activated sludge; anaerobic digestion; chemical oxygen demand; dewatering; electrochemical method; experimental design; hydrogen peroxide; irradiation; optimization; response surface methodology; wastewater treatment; wastewater treatment plant
KW  -  biofuel; Fenton's reagent; hydrogen peroxide; iron
KW  -  anaerobic growth; chemistry; microbiology; oxidation reduction reaction; procedures; sewage; waste water
KW  -  Anaerobiosis; Biofuels; Hydrogen Peroxide; Iron; Oxidation-Reduction; Sewage; Waste Disposal
KW  -  Fluid; Waste Water
ID  - scholars8100
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85030153963&doi=10.1007%2fs11356-017-0287-5&partnerID=40&md5=a83ee80e6732d29c2acc33b703c95f27
IS  - 35
ER  -