| Title: | Mechanism of digestate-derived biochar on odorous gas emissions and humification in composting of digestate from food waste |
| Author(s): | Wang N; Huang D; Bai X; Lin Y; Miao Q; Shao M; Xu Q; |
| Address: | "Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, China. Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, China; School of Ecology, Sun Yat-sen University, Shenzhen 518107, China. Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, China. Electronic address: qiyongxu@pkusz.edu.cn" |
| DOI: | 10.1016/j.jhazmat.2022.128878 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Emissions of odorous gases and prolonged composting duration are the key concerns in the composting of digestate from food waste (DFW). In this study, different amounts of biochar derived from DFW (BC-DFW) were introduced in the composting process of DFW to decrease the emissions of ammonia (NH(3)) and volatile sulfur compounds (VSCs) and composting duration. The addition of BC-DFW increased the temperature and germination index during DFW composting. The group with 25% BC-DFW exhibited a 30% smaller composting duration. Significant amounts of NH(3) and VSCs emissions were observed in the initial phase of DFW composting. Dimethyl disulfide (DMDS) was a prominent contributor to the odor associated with VSCs. The addition of BC-DFW facilitated the adsorption of NH(3) and VSCs, and the corresponding contents decreased by 5-21% and 15-20%, respectively. Moreover,the BC-DFW accelerated the transformation of ammonium-nitrogen (NH(4)(+)-N) to nitrate-nitrogen (NO(3)(-)-N), thereby alleviating the NH(3) volatilization. The addition of 25% BC-DFW minimized the NH(3) emission and enhanced the generation of humic-acid-like matter, thereby promoting humification. Therefore, the addition of 25% BC-DFW was optimal for promoting the degradation of organic matter and humification and odor emission reduction (e.g., NH(3), DMDS)" |
| Keywords: | Charcoal *Composting Food Gases Manure Nitrogen/analysis Odorants/prevention & control *Refuse Disposal Soil Sulfur Compounds Adsorption Ammonia Germination index Humic-acid-like matters Volatile sulfur components; |
| Notes: | "MedlineWang, Ning Huang, Dandan Bai, Xinyue Lin, Yeqi Miao, Qianming Shao, Mingshuai Xu, Qiyong eng Research Support, Non-U.S. Gov't Netherlands 2022/04/16 J Hazard Mater. 2022 Jul 15; 434:128878. doi: 10.1016/j.jhazmat.2022.128878. Epub 2022 Apr 7" |
