TY - JOUR
T1 - VFAs bioproduction from waste activated sludge by coupling pretreatments with Agaricus bisporus substrates conditioning
AU - Zhou, Aijuan
AU - Du, Jingwen
AU - Varrone, Cristiano
AU - Wang, Youzhao
AU - Wang, Aijie
AU - Liu, Wenzong
PY - 2014/2
Y1 - 2014/2
N2 - A novel strategy for improving volatile fatty acids (VFAs) bioproduction from waste activated sludge (WAS) was developed by coupling pretreatments with conditioning (CPC). Agaricus bisporus substrate (ABS) was used as external carbohydrate additive source of conditioning step. Pretreatment was studied in three ways: alkaline, alkaline-thermal and ultrasonic. WAS hydrolysis and protein degradation was distinctly improved by CPC treatments, resulting in a considerable enhancement of VFAs yield. The maximal VFAs yield was 614 ± 71, 712 ± 49 and 598 ± 19 mg COD/g VSS at pre-optimized alkaline, alkaline-thermal and ultrasonic CPC treatments, respectively, with an increase of 35%, 50% and 38% compared to the yields of pretreated WAS fermentation. Fourier transformed infrared spectroscopy and three-dimensional excitation-emission matrix fluorescence spectroscopy indicated that a synergistic effect occurred in co-digesting WAS and ABS. The conditioning of carbohydrate with feasible pretreatment provided large room for the digestibility improvement and the operation cost reduction in the whole WAS treatment system.
AB - A novel strategy for improving volatile fatty acids (VFAs) bioproduction from waste activated sludge (WAS) was developed by coupling pretreatments with conditioning (CPC). Agaricus bisporus substrate (ABS) was used as external carbohydrate additive source of conditioning step. Pretreatment was studied in three ways: alkaline, alkaline-thermal and ultrasonic. WAS hydrolysis and protein degradation was distinctly improved by CPC treatments, resulting in a considerable enhancement of VFAs yield. The maximal VFAs yield was 614 ± 71, 712 ± 49 and 598 ± 19 mg COD/g VSS at pre-optimized alkaline, alkaline-thermal and ultrasonic CPC treatments, respectively, with an increase of 35%, 50% and 38% compared to the yields of pretreated WAS fermentation. Fourier transformed infrared spectroscopy and three-dimensional excitation-emission matrix fluorescence spectroscopy indicated that a synergistic effect occurred in co-digesting WAS and ABS. The conditioning of carbohydrate with feasible pretreatment provided large room for the digestibility improvement and the operation cost reduction in the whole WAS treatment system.
KW - Agaricus bisporus substrates (ABS)
KW - Conditioning
KW - Hydrolysis
KW - Volatile fatty acids (VFAs)
KW - Waste activated sludge (WAS)
UR - http://www.scopus.com/inward/record.url?scp=84895072202&partnerID=8YFLogxK
U2 - 10.1016/j.procbio.2013.11.005
DO - 10.1016/j.procbio.2013.11.005
M3 - Journal article
AN - SCOPUS:84895072202
SN - 1359-5113
VL - 49
SP - 283
EP - 289
JO - Process Biochemistry
JF - Process Biochemistry
IS - 2
ER -