RECOVERY AND BIOLOGICAL UTILIZATION OF ORGANIC WASTES FROM LANDFILLS
The main aim of this study was to develop technology for bio-degradation of organic fraction of municipal solid wastes (OF MSW), deposited mainly in unauthorized, old landfills with fresh organic fraction of municipal wastes. The results of experiments according to the technology performed in a big laboratory scale are presented in this paper. A key to the proposed technology is the method for processing of both “fresh wastes and those taken from old but still biologically active landfills. The wastes taken from the landfill, after separation of bulky waste, are directed to “Mechanical Step Ⅰ, where they are subjected to washing and cleaning. After centrifuging of the wastes, water fraction (sewage), after removal of sand or other ballast components containing about 20 gdm-3 of dry organic matter, is directed to “Biological Step Ⅱ. The biological step covers methane fermentation of sewage and fresh organic fraction of MSW (at HRT of 20 days biogas yield was 546.1 dm3/kg VS fed and biogas production rate was 3.40 dm3 dm-3 d-1), and recovery of biogas (50-60％ of methane) and liquid residue, which is afterwards in the aerobic process subjected to sanitation. The sludge (after filtration of liquid residue) can be used in agriculture, while the filtered water is directed to washing reactors. The eluted solid fraction from the washing reactors is combined with the organic fraction of fresh household wastes and/or vegetable wastes or dewatered sewage sludge and directed to Step Ⅲ. The Thermal Step Ⅲ consists in drying reactor, where autothermal process of bio-drying-bio-stabilisation takes place. The initial moisture content of waste mass was about 0.8 kg kg-1. After the biodrying process the moisture content dropped to ca. 0.3-0.4 kg/kg and the heat of combustion was about 12,3 KJ g-1. Final products in the proposed technology are as follows: bailed dry waste (energy), compost (fertiliser), biogas (energy), inert ballast (final landfill) according to the priorities of municipal solid waste management.
landfills organic fraction of municipal waste anaerobic digestion biodrying
S. LEDAKOWICZ L. KRZYSTEK E. STELMACH A. ZAWADZKA J. STELMACH H.-J. KAHLE
Department of Bioprocess Engineering, Faculty of Process and Environmental Engineering,Technical Uni Lausitzer Naturkunliche Akademie, Oldenburg, Germany
国际会议
北京
英文
890-895
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）