Modified lignin can achieve mitigation of ammonia and greenhouse gas emissions simultaneously in composting

• Published in: Bioresource technology Vol. 402; p. 130840
• Main Authors: Wang, Weishuai, Wang, Xuan, Zhang, Xinyuan, Bai, Zhaohai, Ma, Lin
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.06.2024
• Subjects: Adsorption; Ammonia; Charcoal - chemistry; Composting - methods; Functional groups; Global warming potential; Greenhouse Effect; Greenhouse Gases; Lignin - chemistry; Modification; Soil - chemistry; Wasted straw; Modification; Global warming potential; Wasted straw; Functional groups
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2024.130840

[Display omitted] •Modified lignin has significant potential to reduce NH3 and N2O in composting.•Rich porous structure and grafted R-COOH, R-SO3H functional groups are key factors.•Mitigation of NH3 and GHG emission benefit for 31.0 ∼ 64.6 % global warming potential.•Modified lignin derived from straw provides a feasible low carbon compost additive. The constant ammonia gas (NH3) and greenhouse gases (GHG) emissions were considered as a deep-rooted problem in composting which caused air pollution and global climate change. To achieve the mitigation of NH3 and GHG, a novel additive derived from wasted straw, with modified structure and functional groups, has been developed. Results showed that the adsorption capacity of modified lignin (ML) for both ammonium and nitrate was significantly increased by 132.5–360.8 % and 313.7–454.3 % comparing with biochar (BC) and phosphogypsum (PG) after reconstructing porous structure and grafting R-COOH, R-SO3H functional groups. The application of ML could reduce 36.3 % NH3 emission during composting compared with control. Furthermore, the synergetic mitigation NH3 and GHG in ML treatment resulted in a reduction of global warming potential (GWP) by 31.0–64.6 % compared with BC and PG. These findings provide evidence that ML can be a feasible strategy to effectively alleviate NH3 and GHG emissions in composting.