Improving physicochemical characteristics and anaerobic digestion performance of rice straw via ammonia pretreatment at varying concentrations and moisture levels

Yuan, Hairong; Guan, Ruolin; Wachemo, Akiber Chufo; Zhang, Yatian; Zuo, Xiaoyu

doi:10.1016/j.cjche.2019.07.009

Cited by 29 publications

(6 citation statements)

References 33 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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“…2019 [94] Analyzed anaerobic digestion of heavy-metal-contaminated rice straw inoculated with waste-activated sludge. 2018 [95] Provided useful parameters to evaluate biogas production via anaerobic digestion of rice straw 2018 [96] Investigated the effect of trace element (TE) addition and NaOH pretreatment on the anaerobic digestion of rice straw.…”

Section: [93]mentioning

confidence: 99%

Potential of Rice Industry Biomass as a Renewable Energy Source

et al. 2019

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Fossil fuel depletion, along with its ever-increasing price and detrimental impact on the environment, has urged researchers to look for alternative renewable energy. Of all the options available, biomass presents a very reliable source due to its never-ending supply. As research on various biomasses has grown in recent years, waste from these biomasses has also increased, and it is now time to shift the focus to utilizing these wastes for energy. The current waste management system mainly focuses on open burning and soil incorporation as it is cost-effective; however, these affect the environment. There must be an alternative way, such as to use it for power generation. Rice straw and rice husk are examples of such potential biomass waste. Rice is the main food source for the world, mostly in Asian regions, as most people consume rice daily. This paper reviews factors that impact the implementation of rice-straw-based power plants. Ash content and moisture content are important properties that govern combustion, and these vary with location. Logistical improvements are required to reduce the transport cost of rice husk and rice straw, which is higher than the transportation cost of coal.

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“…The higher fibre digestibility in urea treated corn cob basal diet may be attributed hydrolysis of urea in the treatment process. This hydrolysis generates ammonia mimicking the effect of alkali treatment [6], which in turn disrupts the bond between lignin and cellulose or hemicellulose. Furthermore, this process solubilizes the hemicellulose, enhancing microbial access to the cell content and consequently increased the fiber digestibility [7][8][9].…”

Section: Resultsmentioning

confidence: 99%

Effect of feeding treated or untreated corn cob as grass basal diet replacement on nutrient digestibility, N utilization, and rumen fermentation of lambs

Yulistiani,

Puastuti,

Tresia

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The aim of the study was to assess the effect of substituting a grass basal diet with either untreated or treated corn cobs on nutrient digestibility, nitrogen utilization, and rumen fermentation in lambs. The research utilized 20 lambs aged of 6 months, with an average initial body weight of 17.29 ± 2.05 kg. These lambs were divided into six groups based body weight, each lamb in each group received one of basal diet treatment: fresh chopped grass (FG), ground corn cob (GC), ensiled corn cob (EC), and urea-treated corn cob (UC). The basal diet was provided ad libitum and supplemented with 350 g/head/day of concentrate. The concentrate was formulated to contain 18% crude protein and 73% TDN (total digestible nutrients). Results of the study indicated that the various basal diets influenced fibre digestibility (NDF, ADF, and cellulose). Among the diets, the highest fibre digestibility was observed in the lambs fed the urea-treated corn cob basal diet. The basal diet treatment also affected the excretion of nitrogen through faeces and urine. Lambs fed the urea-treated corn cob basal diet exhibited the highest urinary nitrogen excretion, whereas nitrogen absorption was most efficient in the grass basal diet. Conversely, nitrogen retention was similar across all diets, averaging 2.32 g/head/day. Rumen fermentation parameters, including ruminal pH, NH3-N, and total VFA, exhibited similarity across the different diet treatments. In conclusion, this study suggests that both untreated and treated corn cobs is potential as fibre sources to replace grass basal diet for lambs.

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Improving physicochemical characteristics and anaerobic digestion performance of rice straw via ammonia pretreatment at varying concentrations and moisture levels

Cited by 29 publications

References 33 publications

Carbon migration and metagenomic characteristics during anaerobic digestion of rice straw

Carbon migration and metagenomic characteristics during anaerobic digestion of rice straw

Potential of Rice Industry Biomass as a Renewable Energy Source

Effect of feeding treated or untreated corn cob as grass basal diet replacement on nutrient digestibility, N utilization, and rumen fermentation of lambs

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