title: Green liquor dregs effect on Kraft mill secondary sludge composting.
abstract: Increased Kraft pulp mill production generates increased solid wastes. In response, composting has emerged as an interesting alternative for disposal of these solid wastes. A central composite factor design was used to investigate the influence of incubation conditions (dregs addition and operation time) on chemical and biological parameters, determining the best in-vessel conditions in order to develop a correct composting design. Dregs helped reduce the pH drop that occurs at the beginning of the process. Biological activities presented high values during the active phase, followed by a decrease with stable final values along with N-NH(4)(+) and N-NO(3)(-) trend, which were indicative of mature compost. Dregs addition had not significant effect on the biological activities during composting of Kraft mill sludge. However, moderate amounts of dregs (between 5% and 8%) at operation time of 60-70 days would be the best compromise.
authors.affiliation: Departamento de Ingeniería Química, Universidad de La Frontera, Temuco, Chile. mzambra@ufro.cl
authors.forename: M
authors.initials: M
authors.lastname: Zambrano
authors.forename: C
authors.initials: C
authors.lastname: Pichún
authors.forename: M
authors.initials: M
authors.lastname: Alvear
authors.forename: M
authors.initials: M
authors.lastname: Villarroel
authors.forename: I
authors.initials: I
authors.lastname: Velásquez
authors.forename: J
authors.initials: J
authors.lastname: Baeza
authors.forename: G
authors.initials: G
authors.lastname: Vidal
mesh_terms: D000641:Ammonia / Q000737:chemistry; D002245:Carbon Dioxide; D005947:Glucose / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007220:Industrial Waste / Q000032:analysis*; D008962:Models, Theoretical; D009569:Nitric Oxide / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D012037:Refuse Disposal; D012722:Sewage / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D013696:Temperature; D013997:Time Factors; D014510:Urease / Q000737:chemistry
chemical_list: D007220:Industrial Waste; D012722:Sewage; D012987:Soil; D002245:Carbon Dioxide; D009569:Nitric Oxide; D000641:Ammonia; D014510:Urease; D005947:Glucose; D009584:Nitrogen