Comprehensive evaluation of spent mushroom substrate-chicken manure co-composting by garden waste improvement: physicochemical properties, humification process, and the spectral characteristics of dissolved organic matter

• Published in: Environmental science and pollution research international 2023-01, Vol.30 (4), p.8987-8997
• Main Authors: Jia, Penghui, Huang, Yimei, Chen, Mengli, Qi, Xiping, Hou, Hongyang
• Format: Article
• Language: English
• Subjects: Agaricales; Animals; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Chickens; Composting; Dissolved Organic Matter; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Gardens; Humic Substances; Manure; Soil; Sustainable Solid Waste Treatment and Management; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 1614-7499; 1614-7499
• DOI: 10.1007/s11356-022-20879-7

The performance of garden waste on spent mushroom substrate (SMS) and chicken manure (CM) co-composting efficiency and humification is unclear. Therefore, this study investigated the impact of garden waste addition on SMS-CM co-composting physicochemical properties, humification process, and the spectral characteristics of dissolved organic matter (DOM). The results showed that garden waste improved the physicochemical properties of SMS-CM co-compost, the thermophilic period was advanced 2 days, the seed germination index increased by 30.2%, and the total organic carbon and total nitrogen content increased by 8.80% and 15.0%, respectively. In addition, garden waste increased humic substances (HS) and humic acid (HA) contents by 10.62% and 34.52%, respectively; the HI, PHA and DP increased by 31.53%, 43.19% and 55.53%, respectively; and the SUVA 254 and SUVA 280 of DOM also increased by 6.39% and 4.39%, respectively. In particular, HA content and DOM humification increase rapidly in the first 10 days. The increase of HA accounted for 52% of the total increase during composting. Fourier-transform infrared and two-dimensional correlation analysis further confirmed that garden waste could facilitate the degradation of organic molecules, including amino acids, polysaccharides, carboxyl groups, phenols, and alcohol, and contributed to the preferential utilization of carboxyl groups and polysaccharides and thus enhanced humification.