Anaerobic co-digestion of organic wastes from households, slaughterhouses and meat processing industries was optimised in a half technical scale plant. The plant was operated for 130 days using two different substrates under organic loading rates of 10 and 12 kgCOD.m−3.d−1. Since the substrates were rich in fat and protein components (TKN: 12 g.kg−1) the treatment was challenging. The process was monitored on-line and in the laboratory. It was demonstrated that an intensive and stable co-digestion of partly hydrolysed organic waste and protein rich slaughterhouse waste can be achieved in the balance of inconsistent pH and buffering NH4-N. In the first experimental period the reduction of the substrate COD was almost complete in an overall stable process (COD reduction >82%). In the second period methane productivity increased, but certain intermediate products accumulated constantly. Process design options for a second digestion phase for advanced degradation were investigated. Potential causes for slow and reduced propionic and valeric acid degradation were assessed. Recommendations for full-scale process implementation can be made from the experimental results reported. The highly loaded and stable co-digestion of these substrates may be a good technical and economic treatment alternative.
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Research Article|
April 01 2006
Optimised anaerobic treatment of house-sorted biodegradable waste and slaughterhouse waste in a high loaded half technical scale digester
C. Resch;
*Dep. IFA–Tulln, Institute for Environmental Biotechnology, University of Natural Resources and Applied Life Sciences, Vienna; Konrad Lorenz Straße 20, A-3430 Tulln, Austria
E-mail: christoph.resch@boku.ac.at
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M. Grasmug;
M. Grasmug
**Società Estense Servizi Ambientali S.p.A. Via Comuna SN, I-35042 Este (Padova, ), Italy
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W. Smeets;
W. Smeets
**Società Estense Servizi Ambientali S.p.A. Via Comuna SN, I-35042 Este (Padova, ), Italy
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R. Braun;
R. Braun
*Dep. IFA–Tulln, Institute for Environmental Biotechnology, University of Natural Resources and Applied Life Sciences, Vienna; Konrad Lorenz Straße 20, A-3430 Tulln, Austria
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R. Kirchmayr
R. Kirchmayr
*Dep. IFA–Tulln, Institute for Environmental Biotechnology, University of Natural Resources and Applied Life Sciences, Vienna; Konrad Lorenz Straße 20, A-3430 Tulln, Austria
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Water Sci Technol (2006) 53 (8): 213–221.
Citation
C. Resch, M. Grasmug, W. Smeets, R. Braun, R. Kirchmayr; Optimised anaerobic treatment of house-sorted biodegradable waste and slaughterhouse waste in a high loaded half technical scale digester. Water Sci Technol 1 April 2006; 53 (8): 213–221. doi: https://doi.org/10.2166/wst.2006.252
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