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VFAs bioproduction from waste activated sludge by coupling pretreatments with Agaricus bisporus substrates conditioning

Paper ID Volume ID Publish Year Pages File Format Full-Text
34795 45048 2014 7 PDF Available
Title
VFAs bioproduction from waste activated sludge by coupling pretreatments with Agaricus bisporus substrates conditioning
Abstract

•A novel strategy for improving VFAs bioproduction from waste activated sludge (WAS) was developed.•WAS hydrolysis, VFAs production and protein degradation were improved.•A synergistic effect occurred with co-digesting WAS and ABS.•FTIR and 3D-EEM were successfully employed to explore the mechanism.

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.

Keywords
Waste activated sludge (WAS); Agaricus bisporus substrates (ABS); Volatile fatty acids (VFAs); Hydrolysis; Conditioning
First Page Preview
VFAs bioproduction from waste activated sludge by coupling pretreatments with Agaricus bisporus substrates conditioning
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 49, Issue 2, February 2014, Pages 283–289
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering