Biolysed Sludge Composting for Nitrogen Conservation and Humification Improvements and Mechanisms

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.