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Title: Yearlong semi-continuous operation of thermophilic two-stage anaerobic digesters amended with biochar for enhanced biomethane production

Abstract

This study aimed to scale up an integrated waste-to-energy system for producing pipelinequality biomethane from shake flasks experiments to two-stage digester systems with semicontinuous operation. The yearlong operation was successfully conducted to compare the performance of thermophilic anaerobic digestion (AD) of sewage sludge amended with corn stover biochar (CSBC) and pine biochar (PBC) to the control under various conditions. Both CSBC and PBC promoted the substrate utilization, methane productivity, and process stability of AD, while CSBC showed superior potential. CSBC enhanced methane content in biogas (CH4%) and methane production rate (PCH$$_4$$) by up to 25% and 37% respectively in comparison to the control, with maximum CH4% of 95% and CH4 yield of 0.34 L/g volatile solid (VS)-added being achieved at steady state. The biochar supplementation also led to a substantial increase of the macro- and micro-nutrients (P, K, Ca, Mg, Fe) by up to 33 times in the digestate, increasing its fertilizer value. Finally, microbial community structure and dynamics were also investigated and compared, and in particular, CSBC promoted the abundance of Clostridia and Methanosarcina. Collectively, this study proves that pyro-biochar as an effective additive material enhances AD performance with continuous operation and that CSBC shows greater potential.

Authors:
 [1];  [2];  [3];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Energy Systems Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Energy Global Security Division
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Bioscience Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
OSTI Identifier:
1393848
Alternate Identifier(s):
OSTI ID: 1706178
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cleaner Production
Additional Journal Information:
Journal Volume: 167; Journal Issue: C; Journal ID: ISSN 0959-6526
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Biochar; anaerobic digestion; digestate; in-situ biogas upgrading; microbial community; sewage sludge

Citation Formats

Shen, Yanwen, Forrester, Sara, Koval, Jason, and Urgun-Demirtas, Meltem. Yearlong semi-continuous operation of thermophilic two-stage anaerobic digesters amended with biochar for enhanced biomethane production. United States: N. p., 2017. Web. https://doi.org/10.1016/j.jclepro.2017.05.135.
Shen, Yanwen, Forrester, Sara, Koval, Jason, & Urgun-Demirtas, Meltem. Yearlong semi-continuous operation of thermophilic two-stage anaerobic digesters amended with biochar for enhanced biomethane production. United States. https://doi.org/10.1016/j.jclepro.2017.05.135
Shen, Yanwen, Forrester, Sara, Koval, Jason, and Urgun-Demirtas, Meltem. Mon . "Yearlong semi-continuous operation of thermophilic two-stage anaerobic digesters amended with biochar for enhanced biomethane production". United States. https://doi.org/10.1016/j.jclepro.2017.05.135. https://www.osti.gov/servlets/purl/1393848.
@article{osti_1393848,
title = {Yearlong semi-continuous operation of thermophilic two-stage anaerobic digesters amended with biochar for enhanced biomethane production},
author = {Shen, Yanwen and Forrester, Sara and Koval, Jason and Urgun-Demirtas, Meltem},
abstractNote = {This study aimed to scale up an integrated waste-to-energy system for producing pipelinequality biomethane from shake flasks experiments to two-stage digester systems with semicontinuous operation. The yearlong operation was successfully conducted to compare the performance of thermophilic anaerobic digestion (AD) of sewage sludge amended with corn stover biochar (CSBC) and pine biochar (PBC) to the control under various conditions. Both CSBC and PBC promoted the substrate utilization, methane productivity, and process stability of AD, while CSBC showed superior potential. CSBC enhanced methane content in biogas (CH4%) and methane production rate (PCH$_4$) by up to 25% and 37% respectively in comparison to the control, with maximum CH4% of 95% and CH4 yield of 0.34 L/g volatile solid (VS)-added being achieved at steady state. The biochar supplementation also led to a substantial increase of the macro- and micro-nutrients (P, K, Ca, Mg, Fe) by up to 33 times in the digestate, increasing its fertilizer value. Finally, microbial community structure and dynamics were also investigated and compared, and in particular, CSBC promoted the abundance of Clostridia and Methanosarcina. Collectively, this study proves that pyro-biochar as an effective additive material enhances AD performance with continuous operation and that CSBC shows greater potential.},
doi = {10.1016/j.jclepro.2017.05.135},
journal = {Journal of Cleaner Production},
number = C,
volume = 167,
place = {United States},
year = {2017},
month = {5}
}

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Cited by: 7 works
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