Unlocking the potential differences and effects of the anode and cathode regions on N2O emissions during electric field-assisted aerobic composting

Huayuan Shangguan; Chang Shen; Keren Ding; Xiangtian Peng; Huan Mi; Shuqun Zhang; Jiahuan Tang; Tao Fu; Hao Lin

doi:10.1016/j.biortech.2024.131875

Unlocking the potential differences and effects of the anode and cathode regions on N₂O emissions during electric field-assisted aerobic composting

Bioresour Technol. 2024 Nov 25:131875. doi: 10.1016/j.biortech.2024.131875. Online ahead of print.

Authors

Huayuan Shangguan¹, Chang Shen², Keren Ding³, Xiangtian Peng⁴, Huan Mi⁵, Shuqun Zhang⁵, Jiahuan Tang⁶, Tao Fu⁷, Hao Lin⁸

Affiliations

¹ Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyishan 354300, China; University of Chinese Academy of Sciences, Beijing 100049, China.
² Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyishan 354300, China; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
³ Ag Research, Ruakura Research Centre, Hamilton, New Zealand.
⁴ School of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang 110870, China.
⁵ Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
⁶ Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyishan 354300, China. Electronic address: tangjiah@fafu.edu.cn.
⁷ College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Electronic address: taofuky@163.com.
⁸ Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyishan 354300, China.

PMID: 39603471
DOI: 10.1016/j.biortech.2024.131875

Abstract

Electric field-assisted aerobic composting (EAC) is a novel strategy for effectively mitigating nitrous oxide (N₂O) emissions, but its deeper effects require further exploration. In this study, the differences in N₂O emissions between the anode regions (AR) and cathode regions (CR) during EAC were evaluated. The cumulative N₂O emission from the compost in CR was 32.77% lower than in AR. Compared to AR, the physicochemical properties of CR contribute to the reduction of N₂O emission. PLS-PM analysis suggested that differences in N₂O emission are primarily regulated by N-cycling related functional genes and N-containing substances, with different regulatory effects. In AR, functional genes and N-containing substances are significantly positively correlated with N₂O emissions, whereas in CR, they are significantly negatively correlated. This study highlights the differences and effects of electrode regions in EAC on N₂O emissions, offering new perspectives for future optimization.

Keywords: Electric field; Functional genes; N(2)O mitigation; Physicochemical properties; Spatial differences.