Life Cycle Assessment of Large-scale Compressed Bio-natural Gas Production in China: A Case Study on Manure Co-digestion with Corn Stover

Energies

Yang Yang¹  Guanghui Xie¹  Wanbin Zhu¹  Ji-Qin Ni² 

[1] College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China;Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA;

关键词: compressed bio-natural gas;    eBalance;    energy efficiency;    environmental impact;    mitigation potential;   

DOI  :  10.3390/en12030429

来源: DOAJ

【 摘 要 】

Compressed bio-natural gas (CBG) production from large-scale systems has been recognized as promising because of the abundance of manure and crop residue feedstocks and its environmental friendliness. This study is a life cycle assessment using the local database of an operating large-scale CBG system of manure co-digestion with corn stover in China and eBalance software. The results showed that the system’s Primary Energy Input to Output (PEIO) ratio was 20%. Its anaerobic digestion process was the main contributor to energy consumption, accounting for 76%. Among the six environmental impacts investigated in this study, the global warming potential (GWP) was the major environmental impact, and the digestate effluent management process was the main contributor to the GWP, accounting for 60%. The mitigation potential of the system, compared with reference case for GWP, was 3.19 kg CO₂-eq for 1 m³ CBG production. In the future, the GWP mitigation could be 479 × 10⁶ metric tons CO₂-eq with 150 × 10⁹ m³ yr⁻¹ CBG production from the entire China. This study provides a reference on large-scale CBG production system for establishing a localized life cycle assessment inventory database in China.

【 授权许可】

Unknown