Biolysed Sludge Composting for Nitrogen Conservation and Humification Improvements and Mechanisms

• DOI: 10.3390/su151310119
• Publication Date: 2023-06-27T05:42:02Z
• Authors: Hongyi Wang; Shihong Chen; Jun Gu; Yan Liu; Guangping Yang; Wenqiang Su; Yongfang Xie; Jian Zhu; Ran Yu
• Keywords: Humus

Aerobic composting of conventional municipal sludge has always had the problems nitrogen loss and low humification. In this study, biolysed (BS), polyacrylamids-added (PS) Fe (III)/CaO-added (FS) were used for composting, respectively, their effect on physical-chemical parameters, conversion humification during investigated. The results showed that dissolved organic matter (DOM) concentration BS pile (23.1 ± 0.4 g/kg) was 48.4% higher than PS (15.5 FS piles 0.0 in initial stage became lowest after suggesting degradation DOM promoted pile. can also increase retention rate total (TN) (27.8% 0.8%), (22.7% 1.1%) (24.6% 0.5%), which may be due to lower production ammonia Compared with FS, provided more humic substance (HS) acid (HA) HA contents compost products 34.4 1.0, 35.4 0.2 34.0 0.3 mg/g PS, treated piles, respectively. Fourier transform infrared excitation-emission matrix revealed aromaticity stability HA. degree polymerization (DP) from (1.48) (1.56) (1.36). However, germination index (GI) value (133.4% 6.0%) (152.3% 6.2%) (158.3% showing contain plant biotoxicity. Thus, compared maturity compost.