Evaluation of system stability and anaerobic conversion performance for corn stover using combined pretreatment

Li, Juan; Wachemo, Akiber Chufo; Yuan, Hairong; Zuo, Xiaoyu

doi:10.1016/j.wasman.2019.07.025

Cited by 23 publications

(12 citation statements)

References 32 publications

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“…The biogas-producing performance of the AD of RS determined in the present study was similar to other results reported in the literature [18,19]. These results indicate that the AD process was successful, and subsequent analysis based on this study is justified.…”

Section: Biogas Production Performancesupporting

confidence: 90%

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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Section: Biogas Production Performancesupporting

confidence: 90%

Carbon migration and metagenomic characteristics during anaerobic digestion of rice straw

Chen

Zuo

et al. 2020

Biotechnol Biofuels

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“…The ratio of TVFAs/TAC can be applied to evaluate the buffer ability of anaerobic digestion. Generally, the digestion process could keep stable when the ratio of TVFAs/TAC is below 0.4, and however, the system shows instability when the ratio exceeds 0.8 [27]. TVFAs and TVFAs/TAC of this work were shown in Figure4 (C).…”

Section: Ammonia Nitrogen and Tvfas/tacmentioning

confidence: 69%

“…The process performance of anaerobic reactors often depend on temperature, which plays its part in making favorable conditions for degradable substance in reactors especially in long-term operating condition [27]. Therefore, the Figure 3 and Table 2 showed signi cant daily methane production (DMP) and methane yields difference between MAD and TAD systems.…”

Section: Comparison Of Different Ad Conditionsmentioning

confidence: 99%

Determining Optimal Temperature Combination for Effective Pretreatment and Anaerobic Digestion of Corn Stalk

Wachemo

et al. 2021

Preprint

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Temperature is one of the important factors affecting both chemical pretreatment and anaerobic digestion (AD) process of corn stalk (CS). In this work, the combined ways between pretreatment temperature (40℃ and 60℃) and AD temperature (35℃ and 55℃) were selected to investigate the AD performance for sodium hydroxide (NaOH) pretreated CS. Three organic loading rates (OLRs) of 1.6, 1.8 and 2.0 g·L-1·d-1 were studied within 255 days using continuously stirred tank reactors (CSTR). The results revealed that temperature of 40°C was considered as an appropriate for pretreatment whether in mesophilic or thermophilic anaerobic digestion systems. On the other hand, temperature of 35°C and 55°C were chosen as the optimal AD temperatures for lower and higher OLRs, respectively. This study provides a significant insight for exploring the effects of temperatures on the pretreatment and AD of CS.

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“…3.2.1 TS and VS changes. AD is a substrate converted to methane and carbon dioxide by microbial consumption process, which resulting in a gradual decrease in TS and VS. 23,24 According to the change in the absolute mass of the substrate before and aer AD, the whole TS and VS of WS can be calculated. Moreover, the degradation rate of TS and VS in AD stage are important indicators with which to evaluate the status of AD system.…”

Section: Mass Conversion During Ad Processmentioning

confidence: 99%

Mass conversion pathway during anaerobic digestion of wheat straw

Jian

Wachemo

et al. 2020

RSC Adv.

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Evaluation of system stability and anaerobic conversion performance for corn stover using combined pretreatment

Cited by 23 publications

References 32 publications

Carbon migration and metagenomic characteristics during anaerobic digestion of rice straw

Carbon migration and metagenomic characteristics during anaerobic digestion of rice straw

Determining Optimal Temperature Combination for Effective Pretreatment and Anaerobic Digestion of Corn Stalk

Mass conversion pathway during anaerobic digestion of wheat straw

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