Study on anaerobic co-digestion of cow manure, maize straw and vegetable waste

DOI

10.2991/asei-15.2015.76How to use a DOI?

Keywords

biogas, anaerobic co-digestion, multiple-feedstocks, vegetable waste, acidification.

Abstract

Anaerobic co-digestion strategies has become the development trend of biogas engineering. Most of the lab researches and engineering projects only stay on the two kinds of material mixed fermentation. In order to further solve the problem of raw material shortage and nutritional imbalance, multiple-feedstocks anaerobic co-digestion has become a hotspot of research. This study selected cow manure and maize straw anaerobic fermentation system to add vegetable waste as the third mixed material. Under mesophilic condition (37±1 ), a bench-scale experiment based on anaerobic co-digestion process of this multipe-feedstocks mixtures was conducted in a fed-batch single phase reactor. The biogas production performance was analyzed under different material mixture ratios as R1~R9. Compared with 12.65 and 4.22, when the TS ratio of cow manure and maize straw was 6.34 (R4, R5), the system has the best performance in biogas production. Excess vegetable waste (75 g) led to serious acidification phenomena in R3, R6 and R9, as daily gas production quickly dropped to almost no gas before the 5th day. By adding appropriate amount of NaOH solution to adjust pH to 7.50, through 10 ~ 15 days of recovery, methane bacteria activity gradually restored and therewith the gas production rate increase. In terms of gas production performance, R4 R5 R2 R1 R7 R8. R4 had the highest biogas production with 8870 mL cumulative biogas production, 311.12 mL•g-1TS biogas yield of feedstock and 66.1% methane percentage.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Ruiling Gao
AU  - Zifu Li
AU  - Xuemei Wang
AU  - Shikun Cheng
AU  - Fubin Yin
PY  - 2015/05
DA  - 2015/05
TI  - Study on anaerobic co-digestion of cow manure, maize straw and vegetable waste
BT  - Proceedings of the 2015 International conference on Applied Science and Engineering Innovation
PB  - Atlantis Press
SP  - 357
EP  - 363
SN  - 2352-5401
UR  - https://doi.org/10.2991/asei-15.2015.76
DO  - 10.2991/asei-15.2015.76
ID  - Gao2015/05
ER  -