Zambrano M, Pichún C, Alvear M, Villarroel M, Velásquez I, Baeza J, Vidal G. Green liquor dregs effect on Kraft mill secondary sludge composting.
Bioresour Technol 2010;
101:1028-1035. [PMID:
19819689 DOI:
10.1016/j.biortech.2009.09.049]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2006] [Revised: 08/11/2008] [Accepted: 12/29/2008] [Indexed: 05/28/2023]
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.
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