好氧生物预处理时间对玉米秸秆水解酸化的影响

doi:10.3969/j.issn.1673-5854.2022.01.003

Abstract

Abstract:

Corn straw was used as raw material for aerobic biological pretreatment by a complex bacterial system and then inoculated with anaerobic sludge for anaerobic fermentation. The influence of pretreatment time on anaerobic fermentation was investigated, and the changes in lignocellulose structure and content, key enzyme activities, microbial diversity and anaerobic acidification fermentation yield were determined. The results showed that with the extension of pretreatment time, the structure of corn straw was gradually destroyed, the activity of lignin peroxidase, the key enzyme for lignin degradation, gradually decreased, and the activities of xylanase and cellulase gradually increased and were up to 0.879 U/mg and 0.0257 U/mg. Actinomyces, Bacillus and Aspergillus were the dominant bacterium groups in the aerobic biological pretreatment of straw. The best acid production from anaerobic fermentation of corn straw was achieved by aerobic biological pretreatment for 2 d. The yield of ethanol and volatile fatty acids was 249.3 mg/g, 46.73% higher than that of untreated. The yield of ethanol and volatile fatty acids was 138.2 mg/g after 5 d of aerobic pretreatment, which was 18.66% lower than that of the untreated corn straw. The reason for the decrease of volatile fatty acids production from anaerobic fermentation due to extended aerobic pretreatment time was the excessive degradation of hemicellulose and cellulose. The pretreatment method of anaerobic fermentation of corn straw using aerobic biological pretreatment with complex microbial system as the purpose of energy and resource utilization should strictly control the pretreatment time to avoid the decrease of product yield caused by excessive degradation of cellulose and hemicellulose.

Key words: corn straw, aerobic biological treatment, anaerobic fermentation, volatile fatty acids

CLC Number:

TQ35
X71

Xiyue LI, Hongbo WANG, Yuxiao ZHAO, Dongliang HUA, Ning WANG. Effect of Aerobic Biological Pretreatment Time on Hydrolytic Acidification of Corn Straw[J]. Biomass Chemical Engineering, 2022, 56(1): 13-22.

Figures/Tables 7

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References 31

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处理时间/d time	玉米秸秆质量减少量/mg mass reduction of corn straw	降解率/% degradation rate	纤维素cellulose		半纤维素hemicellulose		木质素lignin
处理时间/d time	玉米秸秆质量减少量/mg mass reduction of corn straw	降解率/% degradation rate	质量/mg mass	降解率/% degradation rate	质量/mg mass	降解率/% degradation rate	质量/mg mass	降解率/% degradation rate
1	1112	5.55	7442	1.29	7397	3.09	1876	5.58
2	1293	6.46	7421	1.56	7251	5.00	1779	10.44
3	2018	10.09	7171	4.88	7060	7.51	1602	19.35
4	2776	13.88	7113	5.65	4325	17.14	1555	21.71
5	3432	17.16	6901	8.47	5908	22.59	1552	21.85

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Effect of Aerobic Biological Pretreatment Time on Hydrolytic Acidification of Corn Straw

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