Experimental co-digestion of corn stalk and vermicompost to improve biogas production

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2010.03.014· OSTI ID:21457153

Guangyin, Chen ^[1]; Shiguan, Yang ^[2]; Caixia, Fang; Xingxing, Zou; Yan, Luo ^[1]

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1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093 (China)
2. National Engineering Laboratory of Biomass Power Generation Equipment, School of Renewable Energy, North China Electric Power University, Beijing 102206 (China)

Anaerobic co-digestion of corn stalk and vermicompost (VC) as well as mono-digestion of corn stalk were investigated. Batch mono-digestion experiments were performed at 35 {+-} 1 {sup o}C and initial total solid loading (TSL) ranged from 1.2% to 6.0%. Batch co-digestion experiments were performed at 35 {+-} 1 {sup o}C and initial TSL of 6% with VC proportions ranged from 20% to 80% of total solid (TS). For mono-digestion of corn stalk, a maximum methane yield of 217.60 {+-} 13.87 mL/g TS{sub added} was obtained at initial TSL of 4.8%, and acidification was found at initial TSL of 6.0% with the lowest pH value of 5.10 on day 4. Co-digestion improved the methane yields by 4.42-58.61% via enhancing volatile fatty acids (VFAs) concentration and pH value compared with mono-digestion of corn stalk. The maximum biogas yield of 410.30 {+-} 11.01 mL/g TS{sub added} and methane yield of 259.35 {+-} 13.85 mL/g TS{sub added} were obtained for 40% VC addition. Structure analysis by X-ray diffractometry (XRD) showed that the lowest crystallinity of 35.04 of digested corn stalk was obtained from co-digestion with 40% VC, which decreased 29.4% compared to 49.6 obtained from un-treated corn stalk. It is concluded that co-digestion with VC is beneficial for improving biodigestibility and methane yield from corn stalk.

• OSTI ID: 21457153
• Journal Information: Waste Management, Vol. 30, Issue 10; Other Information: DOI: 10.1016/j.wasman.2010.03.014; PII: S0956-053X(10)00183-2; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
ACIDIFICATION
ANAEROBIC DIGESTION
CARBOXYLIC ACIDS
COMPOST
METHANE
PH VALUE
THERMOLUMINESCENCE
VOLATILE MATTER
X-RAY DIFFRACTION
YIELDS
ALKANES
BIOCONVERSION
COHERENT SCATTERING
DIFFRACTION
DIGESTION
EMISSION
HYDROCARBONS
LUMINESCENCE
MATTER
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC WASTES
PHOTON EMISSION
SCATTERING
WASTES