Journal article
Role of soil in improving process performance and methane yield of anaerobic digestion with corn straw as substrate
Energy (Oxford), Vol.151, pp.998-1006
05/15/2018
Handle:
https://hdl.handle.net/2376/117285
Abstract
Solid-state anaerobic digestion is widely used in lieu of liquid-stage anaerobic digestion for treating biowastes due to the former's advantages. However, unsatisfactory process performance and low methane yields inhibit the development of solid-state anaerobic digestion for treating lignocellulosic material. Soil, with the potential of inter-species electron transfer, buffer capacity, and nutritional elements for microbial growth, was used to improve the anaerobic digestion efficiency. At the same time, simultaneous NaOH treatment was adopted to simplify the lignocellulose treatment process. Results include daily methane yield enhancement and improved methane content. The maximum methane yield (344 L/kg volatile solid) was obtained at 1% NaOH for the group with soil addition; pH was maintained in a suitable range (6.6–7.8). The difference in total methane yield between a solid-state digester with no NaOH but with soil addition and a digester with 1% NaOH without soil addition was not significant, which indicates that soil stimulated the potential methane yield and could be an alternative for simultaneous NaOH treatment. The cations contained in soil is verified to be the main reason to improve the anaerobic digestion efficiency. Therefore, the discovery found in this study can be the reference for various biowastes conversion via solid-state anaerobic digestion.
•Effect of soil on anaerobic digestion (AD) of corn straw with NaOH is studied.•The AD process performance hence the methane production is found to be improved.•The maximum methane production (344 L/kg VS) is obtained with soil addition and 1%NaOH treatment.•Soil is an alternative of simultaneous NaOH treatment in improving methane production.•Ions in soil is verified to be the main reason to the improvement of AD efficiency.
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Details
- Title
- Role of soil in improving process performance and methane yield of anaerobic digestion with corn straw as substrate
- Creators
- Yiqing Yao - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164-6120, USAJianye Zhou - Key Laboratory of Oral Diseases of Gansu Province, Key Laboratory of Stomatology of the State Ethnic Affairs Commission, Northwest University for Nationalities, Lanzhou, Gansu, ChinaLizhe An - Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou 730000, ChinaGopi Krishna Kafle - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164-6120, USAShulin Chen - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164-6120, USALing Qiu - College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
- Publication Details
- Energy (Oxford), Vol.151, pp.998-1006
- Academic Unit
- Biological Systems Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900582325001842
- Language
- English
- Resource Type
- Journal article