Effect of rice husk and palm tree-based biochar addition on the anaerobic digestion of food waste/sludge.

Debnath Ovi; Soon Woong Chang; Jonathan W.C. Wong; Johnravindar Davidraj; Sunita Varjani; Jae Hoon  Jeung; Woo Jin  Chung; Anand Thirupathi; Balasubramani Ravindran

doi:10.1016/j.fuel.2022.123188

Effect of rice husk and palm tree-based biochar addition on the anaerobic digestion of food waste/sludge.

Debnath Ovi, Soon Woong Chang, Jonathan W.C. Wong, Johnravindar Davidraj, Sunita Varjani, Jae Hoon Jeung, Woo Jin Chung, Anand Thirupathi^*, Balasubramani Ravindran^*

^*Corresponding author for this work

Department of Biology

Research output: Contribution to journal › Journal article › peer-review

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Abstract

This study explored the impact of different types of biochar on the anaerobic digestion (AD) of food waste and sludge and the biochar-enhanced mesophilic AD of food waste for methane production. A particular focus was placed on the process and underlying mechanisms. Rice husk biochar (RHB550) and palm tree biochar (PTB400) were loaded at levels of 5, 10, and 15 g/L. The results showed that 5 g/L of RHB550 led to an increase in methane yields of 455.83 ± 17.9 mL/gVS_add compared to the control yield of 333.32 ± 14.9 mL/gVS_add. The addition of an adequate amount of biochar improved the cumulative methane yield, whereas excessive amounts inhibited the AD process. RHB550 biochar improved the process stability, which was favourable for syntrophic volatile fatty acid (VFA) oxidation, and consequently increased the cumulative methane yield by up to 36.75 ± 2.9%. Earlier stagnation was also shown to be caused by the elimination of VFAs and ammoniacal-nitrogen and the degradation of chemical oxygen demand (COD). Increasing the concentrations of RHB550 biochar enabled significant improvement in methane yield by increasing the pH and COD removal, which could be a useful strategy in AD to further increase the organic loading rate.

Original language	English
Article number	123188
Journal	Fuel
Volume	315
DOIs	https://doi.org/10.1016/j.fuel.2022.123188
Publication status	Published - 1 May 2022

Scopus Subject Areas

Energy Engineering and Power Technology
General Chemical Engineering
Fuel Technology
Organic Chemistry

User-Defined Keywords

Anaerobic digestion
Biochar
Food waste
Methane yield

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10.1016/j.fuel.2022.123188

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title = "Effect of rice husk and palm tree-based biochar addition on the anaerobic digestion of food waste/sludge.",

abstract = "This study explored the impact of different types of biochar on the anaerobic digestion (AD) of food waste and sludge and the biochar-enhanced mesophilic AD of food waste for methane production. A particular focus was placed on the process and underlying mechanisms. Rice husk biochar (RHB550) and palm tree biochar (PTB400) were loaded at levels of 5, 10, and 15 g/L. The results showed that 5 g/L of RHB550 led to an increase in methane yields of 455.83 ± 17.9 mL/gVSadd compared to the control yield of 333.32 ± 14.9 mL/gVSadd. The addition of an adequate amount of biochar improved the cumulative methane yield, whereas excessive amounts inhibited the AD process. RHB550 biochar improved the process stability, which was favourable for syntrophic volatile fatty acid (VFA) oxidation, and consequently increased the cumulative methane yield by up to 36.75 ± 2.9%. Earlier stagnation was also shown to be caused by the elimination of VFAs and ammoniacal-nitrogen and the degradation of chemical oxygen demand (COD). Increasing the concentrations of RHB550 biochar enabled significant improvement in methane yield by increasing the pH and COD removal, which could be a useful strategy in AD to further increase the organic loading rate.",

keywords = "Anaerobic digestion, Biochar, Food waste, Methane yield",

author = "Debnath Ovi and Chang, {Soon Woong} and Wong, {Jonathan W.C.} and Johnravindar Davidraj and Sunita Varjani and Jeung, {Jae Hoon} and Chung, {Woo Jin} and Anand Thirupathi and Balasubramani Ravindran",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. 2020R1G1A1012069). Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

year = "2022",

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doi = "10.1016/j.fuel.2022.123188",

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T1 - Effect of rice husk and palm tree-based biochar addition on the anaerobic digestion of food waste/sludge.

AU - Ovi, Debnath

AU - Chang, Soon Woong

AU - Wong, Jonathan W.C.

AU - Davidraj, Johnravindar

AU - Varjani, Sunita

AU - Jeung, Jae Hoon

AU - Chung, Woo Jin

AU - Thirupathi, Anand

AU - Ravindran, Balasubramani

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. 2020R1G1A1012069). Publisher Copyright: © 2022 Elsevier Ltd

PY - 2022/5/1

Y1 - 2022/5/1

N2 - This study explored the impact of different types of biochar on the anaerobic digestion (AD) of food waste and sludge and the biochar-enhanced mesophilic AD of food waste for methane production. A particular focus was placed on the process and underlying mechanisms. Rice husk biochar (RHB550) and palm tree biochar (PTB400) were loaded at levels of 5, 10, and 15 g/L. The results showed that 5 g/L of RHB550 led to an increase in methane yields of 455.83 ± 17.9 mL/gVSadd compared to the control yield of 333.32 ± 14.9 mL/gVSadd. The addition of an adequate amount of biochar improved the cumulative methane yield, whereas excessive amounts inhibited the AD process. RHB550 biochar improved the process stability, which was favourable for syntrophic volatile fatty acid (VFA) oxidation, and consequently increased the cumulative methane yield by up to 36.75 ± 2.9%. Earlier stagnation was also shown to be caused by the elimination of VFAs and ammoniacal-nitrogen and the degradation of chemical oxygen demand (COD). Increasing the concentrations of RHB550 biochar enabled significant improvement in methane yield by increasing the pH and COD removal, which could be a useful strategy in AD to further increase the organic loading rate.

AB - This study explored the impact of different types of biochar on the anaerobic digestion (AD) of food waste and sludge and the biochar-enhanced mesophilic AD of food waste for methane production. A particular focus was placed on the process and underlying mechanisms. Rice husk biochar (RHB550) and palm tree biochar (PTB400) were loaded at levels of 5, 10, and 15 g/L. The results showed that 5 g/L of RHB550 led to an increase in methane yields of 455.83 ± 17.9 mL/gVSadd compared to the control yield of 333.32 ± 14.9 mL/gVSadd. The addition of an adequate amount of biochar improved the cumulative methane yield, whereas excessive amounts inhibited the AD process. RHB550 biochar improved the process stability, which was favourable for syntrophic volatile fatty acid (VFA) oxidation, and consequently increased the cumulative methane yield by up to 36.75 ± 2.9%. Earlier stagnation was also shown to be caused by the elimination of VFAs and ammoniacal-nitrogen and the degradation of chemical oxygen demand (COD). Increasing the concentrations of RHB550 biochar enabled significant improvement in methane yield by increasing the pH and COD removal, which could be a useful strategy in AD to further increase the organic loading rate.

KW - Anaerobic digestion

KW - Biochar

KW - Food waste

KW - Methane yield

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M1 - 123188

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Effect of rice husk and palm tree-based biochar addition on the anaerobic digestion of food waste/sludge.

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