Composting of de-inking paper sludge with poultry manure at three nitrogen levels using mechanical turning : behavior of physico-chemical parameters

Authors: Charest, Marie-Hélène; Beauchamp, Chantal Jeanne
Abstract: De-inking paper sludge (DPS) is rich in carbon (C) but poor in nitrogen (N). Thus, it has a high C:N ratio which limits the composting process. Accordingly, the goal of this study was to investigate the effect of three N treatments on DPS composting. Compost piles of Full-size image (<1 K) were formed by mixing raw DPS with poultry manure and chicken broiler floor litter, giving on average 0.6%, 0.7% and 0.9% total N. The changes in physico-chemical parameters, total weight and fiber losses, and maturity of composting piles of DPS were monitored during 24 weeks. The compost piles had a neutral to alkaline pH throughout the study. Inorganic N decreased whereas organic N increased over time for all treatments. These changes in magnitude were different among N treatments resulting in a final total N content of 0.9% for the 0.6% N treatment whereas final total N contents of 0.7% and 0.9% N were measured for the 0.7% and 0.9% N treatments. The total weight, cellulose and hemicellulose losses were higher in 0.6% N treatment giving the lowest C:N ratio after 24 weeks of composting. However, none of the 24 week-old composts of DPS were mature based on their final C:N ratio and colorimetric test of maturity. Except for copper, their final total trace element contents meet most known standards or guidelines for organic soil conditioners. Overall, 0.6% N treatment was the best to enhance DPS composting using mechanical turning, but a period of more than 24 weeks was required to reach compost maturity. -- Keywords : Papermill sludge; Manure; Nitrogen; Cellulose; Hemicellulose; Lignin; Carbon; Compost
Document Type: Article de recherche
Issue Date: 5 October 2001
Open Access Date: Restricted access
Document version: VoR
This document was published in: Bioresource Technology
Alternative version: 10.1016/S0960-8524(01)00104-3
Collection:Articles publiés dans des revues avec comité de lecture

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