Comparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>

Neutralization with liquid digestate and CO<sub>2</sub> was compared herein to adjust the pH of lime-treated corn stover. The effects on the thermophilic (55 °C) anaerobic digestion were also analyzed. Liquid digestate neutralization (LDN) caused a decrease in pH from 10.5 to 7.5 in 60 h...

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Autores principales:	Lei Xiao, Man Yang, Di Hu, Yuxia Mei, Shumiao Zhao, Yunxiang Liang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	thermophilic anaerobic digestion liquid digestate carbon dioxide lime pretreatment corn stover Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/5bd36fa4085d49edbfca855c3826728a
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spelling	oai:doaj.org-article:5bd36fa4085d49edbfca855c3826728a2021-11-25T16:39:50ZComparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>10.3390/app1122108842076-3417https://doaj.org/article/5bd36fa4085d49edbfca855c3826728a2021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10884https://doaj.org/toc/2076-3417Neutralization with liquid digestate and CO<sub>2</sub> was compared herein to adjust the pH of lime-treated corn stover. The effects on the thermophilic (55 °C) anaerobic digestion were also analyzed. Liquid digestate neutralization (LDN) caused a decrease in pH from 10.5 to 7.5 in 60 h and accumulation of acetic/isobutyric acids. The CO<sub>2</sub> neutralization (CN) under solid-state conditions reduced the pH from 10.5 to 8.5 in 30 min, which is faster than that of LDN and did not affect the subsequent anaerobic digestion. Biomethane production rate indicates that LDN contributed to the performance of anaerobic digestion, but this was not sufficient to compensate for the loss of total biomethane yield, resulting in a negative net profit (i.e., revenue from increased energy production minus reagent cost). For CN under solid-state conditions, the biomethane production was highest in both liquid- and solid-state anaerobic digestion, and also obtained a net profit of 98.74–100.89 RMB/tonne dry biomass. Therefore, the solid-state condition CN is a more efficient and economic method for adjusting initial pH of lime-treated corn stover.Lei XiaoMan YangDi HuYuxia MeiShumiao ZhaoYunxiang LiangMDPI AGarticlethermophilic anaerobic digestionliquid digestatecarbon dioxidelime pretreatmentcorn stoverTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10884, p 10884 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermophilic anaerobic digestion liquid digestate carbon dioxide lime pretreatment corn stover Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	thermophilic anaerobic digestion liquid digestate carbon dioxide lime pretreatment corn stover Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Lei Xiao Man Yang Di Hu Yuxia Mei Shumiao Zhao Yunxiang Liang Comparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>
description	Neutralization with liquid digestate and CO<sub>2</sub> was compared herein to adjust the pH of lime-treated corn stover. The effects on the thermophilic (55 °C) anaerobic digestion were also analyzed. Liquid digestate neutralization (LDN) caused a decrease in pH from 10.5 to 7.5 in 60 h and accumulation of acetic/isobutyric acids. The CO<sub>2</sub> neutralization (CN) under solid-state conditions reduced the pH from 10.5 to 8.5 in 30 min, which is faster than that of LDN and did not affect the subsequent anaerobic digestion. Biomethane production rate indicates that LDN contributed to the performance of anaerobic digestion, but this was not sufficient to compensate for the loss of total biomethane yield, resulting in a negative net profit (i.e., revenue from increased energy production minus reagent cost). For CN under solid-state conditions, the biomethane production was highest in both liquid- and solid-state anaerobic digestion, and also obtained a net profit of 98.74–100.89 RMB/tonne dry biomass. Therefore, the solid-state condition CN is a more efficient and economic method for adjusting initial pH of lime-treated corn stover.
format	article
author	Lei Xiao Man Yang Di Hu Yuxia Mei Shumiao Zhao Yunxiang Liang
author_facet	Lei Xiao Man Yang Di Hu Yuxia Mei Shumiao Zhao Yunxiang Liang
author_sort	Lei Xiao
title	Comparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>
title_short	Comparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>
title_full	Comparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>
title_fullStr	Comparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>
title_full_unstemmed	Comparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>
title_sort	comparison of initial ph adjustment prior to thermophilic anaerobic digestion of lime-treated corn stover via liquid digestate or co<sub>2</sub>
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5bd36fa4085d49edbfca855c3826728a
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Comparison of Initial pH Adjustment Prior to Thermophilic Anaerobic Digestion of Lime-Treated Corn Stover via Liquid Digestate or CO<sub>2</sub>

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