Monitoring and optimizing the co-composting of dewatered sludge: A mixture experimental design approach
The management of dewatered wastewater sludge is a major issue worldwide. Sludge disposal to landfills is not sustainable and thus alternative treatment techniques are being sought. The objective of this work was to determine optimal mixing ratios of dewatered sludge with other organic amendments in...
| Publicado en: | Journal of Environmental Management Vol. 92; no. 9; pp. 2241 - 2250 |
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| Autores principales: | , , |
| Formato: | Artículo |
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Academic Press Inc.
Sep2011
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=61162319&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 61162319 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 03014797 EMJ jtl: Journal of Environmental Management issn: 03014797 maglogo: N pubinfo: dt: Sep2011 vid: 92 iid: 9 pid: 735 pub: Academic Press Inc. artinfo: ui: 61162319 10.1016/j.jenvman.2011.04.012 ppf: 2241 ppct: 9 formats: tig: atl: Monitoring and optimizing the co-composting of dewatered sludge: A mixture experimental design approach aug: au: Komilis, Dimitrios Evangelou, Alexandros Voudrias, Evangelos affil: Laboratory of Solid and Hazardous Waste Management, Department of Environmental Engineering, Democritus University of Thrace, Xanthi GR-671 00, Greece su: Environmental engineering Biodegradation Sewage disposal in the ground Sludge management Sanitary landfills Composting Research methodology Bioreactors sug: subj: Environmental engineering Waste treatment and disposal Solid Waste Landfill Other Nonhazardous Waste Treatment and Disposal Biodegradation Sewage disposal in the ground Sludge management Sanitary landfills Composting Research methodology Bioreactors keyword: Amendments Mixture experimental design Process optimization Sludge composting Amendments Mixture experimental design Process optimization Sludge composting ab: The management of dewatered wastewater sludge is a major issue worldwide. Sludge disposal to landfills is not sustainable and thus alternative treatment techniques are being sought. The objective of this work was to determine optimal mixing ratios of dewatered sludge with other organic amendments in order to maximize the degradability of the mixtures during composting. This objective was achieved using mixture experimental design principles. An additional objective was to study the impact of the initial C/N ratio and moisture contents on the co-composting process of dewatered sludge. The composting process was monitored through measurements of O uptake rates, CO evolution, temperature profile and solids reduction. Eight (8) runs were performed in 100 L insulated air-tight bioreactors under a dynamic air flow regime. The initial mixtures were prepared using dewatered wastewater sludge, mixed paper wastes, food wastes, tree branches and sawdust at various initial C/N ratios and moisture contents. According to empirical modeling, mixtures of sludge and food waste mixtures at 1:1 ratio (ww, wet weight) maximize degradability. Structural amendments should be maintained below 30% to reach thermophilic temperatures. The initial C/N ratio and initial moisture content of the mixture were not found to influence the decomposition process. The bio C/bio N ratio started from around 10, for all runs, decreased during the middle of the process and increased to up to 20 at the end of the process. The solid carbon reduction of the mixtures without the branches ranged from 28% to 62%, whilst solid N reductions ranged from 30% to 63%. Respiratory quotients had a decreasing trend throughout the composting process. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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