基于秸秆后发酵产沼气的一次发酵时间优化

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Abstract To solve the problems of low chemical treatment efficiency and high treatment cost caused by entanglement of cellulose, hemicellulose and lignin in straw, the process of "first fermentation + NaOH treatment + secondary fermentation (PNS)" was adopted, and the effect of primary fermentation time on biogas production of straw was studied. The results indicated that the digested rice straw could still be used for biogas production with total solid (TS) biogas yield of 28.11-50.73mL/g TS, and the biogas yield was inversely proportional to first fermentation time. After the NaOH treatment, the material structure of digested rice straw was obviously damaged and a large amount of organic matter was leached out. The concentrations of COD, TN, NH₄⁺-N and NO₃^--N in the rice straw leachate were significantly increased by 128.56%~213.62%, 93.92%~110.59%, 53.90%~73.78% and 112.08%~188.98%, respectively, compared with those without NaOH treatment. NaOH treatment did not destroy the skeletal structure of digested rice straw, but changed the relative content of functional groups of digested rice straw, which intensified the destruction of cellulose, hemicellulose and lignin. After first fermentation of 15, 25, 35d and NaOH-treatment, the digested rice straw were reused for biogas production. The TS biogas production of digested rice straw were increased by 77.37%, 119.41% and 159.94%, respectively, compared with that under control treatment. The longer primary fermentation time, the better effect of promoting biogas production. After the experiment, the total biogas yield of rice straw of the treatment of primary fermentation time with 15, 25 and 35d were 202.78, 205.15 and 210.21mL/g TS, respectively, which were significantly increased by 11.89%, 13.20% and 15.99% compared with that of correspending control, and the total fermentation time were extended by -12, -2 and 8days. In summary, when adopting the process of PNS, the primary fermentation time of 15d is suitable.

Key words： post-fermentation anaerobic digestion primary fermentation time NaOH treatment rice straw biogas

Received: 24 September 2021

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X705

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	Articles by authors
	CHEN Guang-yin
	CAO Hai-nan
	HUANG Yan
	WANG Yu
	WANG Jing
	CHANG Zhi-zhou
	DONG Jin-zhu
	WU Pei
	FANG Cai-xia

Cite this article:

CHEN Guang-yin,CAO Hai-nan,HUANG Yan等. Optimization of the first fermentation time based on biogas post-fermentation with rice straw[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1780-1787.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1780

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