Enhancing anaerobic digestion performance and degradation of lignocellulosic components of rice straw by combined biological and chemical pretreatment

Guan, Ruolin; Li, Xiujin; Wachemo, Akiber Chufo; Yuan, Hairong; Liu, Yan-Ping; Zou, Dexun; Zuo, Xiaoyu; Gu, Junyu

doi:10.1016/j.scitotenv.2018.04.366

Cited by 118 publications

(32 citation statements)

References 41 publications

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“…Cumulative biogas and biomethane production Figure 2 Daily biogas production, methane content, and cumulative biogas and biomethane production during AD of SMS The time required to produce 80% of the maximal biomethane production (T 80 ) is used to evaluate the digestion performance of AD processes [45] . The T 80 for SMS was 25±1 days and the shorter digestion time (10.7% shorter than that of the control test in previous studies) [46] could be associated to delignification of the substrate by mushroom cultivation.…”

Section: Anaerobic Digestionmentioning

confidence: 54%

Full utilization of nutrients in rice straw by integrating mushroom cultivation, biogas production, and fertilizer use

Huang

Wachemo

Yuan

et al. 2019

International Journal of Agricultural and Biological Engineering

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This study proposed an integrated process of Pleurotus ostreatus cultivation, anaerobic digestion of spent mushroom substrate (SMS), and fertilizer value evaluation of digestate for achieving multiple products and full utilization of nutrients in rice straw. The results showed that the cultivated mushroom yield from rice straw was 401 g/kg TS. Biomethane yield obtained from anaerobic digestion of SMS was 133.0 mL/g VS. The fertilizer value of the SMS based digestate reached the national standard of fertilizers from organic sources in China. Substance conversion of rice straw during the integrated process revealed that the process could achieve the full utilization of nutrients in the substrate. Energy assessment indicated that the process had the viability to be applied. Therefore, this study provided a feasible strategy to set up a complete recycling agricultural ecosystem.

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Section: Anaerobic Digestionmentioning

confidence: 54%

Full utilization of nutrients in rice straw by integrating mushroom cultivation, biogas production, and fertilizer use

Huang

Wachemo

Yuan

et al. 2019

International Journal of Agricultural and Biological Engineering

Self Cite

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“…Daily biogas production was measured using the water displacement method [26]. The biogas composition was determined using gas chromatography (SP-2100, BeiFenRuiLi, Beijing, China).…”

Section: Methodsmentioning

confidence: 99%

“…The biogas composition was determined using gas chromatography (SP-2100, BeiFenRuiLi, Beijing, China). The American Public Health Association standard method was used to determine total solids (TS) and volatile solids (VS) [26]. The total organic carbon (TOC) content was measured by the multiple dilution method using…”

Section: Methodsmentioning

confidence: 99%

Carbon migration and metagenomic characteristics during anaerobic digestion of rice straw

Chen

Zuo

et al. 2020

Biotechnol Biofuels

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Background: Considerable interest has been expressed in the development of anaerobic digestion (AD) of straw to solve the environmental problems caused by the dumping and burning of straw and to generate clean energy. However, the poor biodegradability of straw and the low efficiency of energy generation achieved during its AD are problematic. Studying the parameter changes involved in the process of AD is helpful for clarifying its micro-mechanisms and providing a theoretical basis for improving its efficiency. Currently, most research into process parameters has focused on gas production, methane content, pH, and volatile fatty acid (VFA) content; limited research has focused on carbon migration and functional gene changes during the AD of straw. Results: Carbon migration and changes in metagenomic characteristics during the AD of rice straw (RS) were investigated. Accumulated biogas production was 388.43 mL/g VS. Carbon in RS was consumed, and the amount of carbon decreased from 76.28 to 36.83 g (conversion rate 51.72%). The degree of hydrolysis rapidly increased during the first 5 days, and a large amount of carbon accumulated in the liquid phase before migrating into the gas phase. By the end of AD, the amount of carbon in the liquid and gas phases was 2.67 and 36.78 g, respectively. According to our metagenomic analysis, at the module level, the abundance of M00357, M00567, M00356, and M00563 (the modules related to the generation of methane) during AD were 51.23-65.43%, 13.96-26.88%, 16.44-22.98%, and 0.83-2.40%, respectively. Methyl-CoM, 5-methyl-5,6,7,8-tetrahydromethanopterin, and Acetyl-CoA were important intermediates. Conclusions: Carbon was enriched in the liquid phase for the first 5 days and then gradually consumed, and most of the carbon was transferred to the gas phase by the end of AD. In this study, AD proceeded mainly via aceticlastic methanogenesis, which was indicated to be a dominant pathway in methane metabolism. Batch AD could be divided into three stages, including initiation (days 1-5), adaptation (days 6-20), and stabilization (days 21-50), according to biogas production performance, carbon migration, and metagenomic characteristics during AD.

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“…Moreover, studies that have examined the effects of co-pretreatment by applying two or more pretreatment types have also been conducted. The influence of a CaO-LFD bio-chemical pretreatment on rice straw rose the methane yield to 57.56% [33]. Ji reported a 61.54% increase in the methane yield for corn straw after co-pretreatment with calcium hydroxide and steam explosion [34].…”

Section: Introductionmentioning

confidence: 99%

Process optimization for the anaerobic digestion of poplar ( Populus L .) leaves

2020

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This study investigates the optimized condition for enhancing biogas production in the anaerobic digestion of fallen poplar leaves. Two experiments were conducted: (1) The calcium hydroxide concentration, bacteria concentration, and composting time were used as three parameters to optimize the fermentation pretreatment condition and contrasting tests were performed; and (2) a series of fermentation tests were conducted to explore the best process parameters and biogas production characteristics. The results showed that a biological and chemical combined pretreatment effectively improved the biogas productivity of poplar leaves as fermentation substrates, and the parameter that had the greatest effect during anaerobic digestion was temperature followed by the solid concentration and pH value. The optimal pretreatment condition was: alkali concentration 4.61%, bacterial concentration 0.20‰, and a composting time of 6.6 days. By considering the factors that affect the fermentation of poplar leaves and the cumulative gas production, the optimum condition for poplar leave digestion was found to be a temperature of 30°C, a pH of 7, and a 10% solid concentration. In addition, the methane yield of the optimized trial was well fitted using the modified Gompertz model. ARTICLE HISTORY

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Enhancing anaerobic digestion performance and degradation of lignocellulosic components of rice straw by combined biological and chemical pretreatment

Cited by 118 publications

References 41 publications

Full utilization of nutrients in rice straw by integrating mushroom cultivation, biogas production, and fertilizer use

Full utilization of nutrients in rice straw by integrating mushroom cultivation, biogas production, and fertilizer use

Carbon migration and metagenomic characteristics during anaerobic digestion of rice straw

Process optimization for the anaerobic digestion of poplar ( Populus L .) leaves

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