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Co-digestion of press water and food waste in a biowaste digester for improvement of biogas production

Satoto E Nayono, Claudia Gallert, and Josef Winter

Bioresour Technol 101(18):7 (2010) PMID 20400298

Co-digestion of press water from organic municipal wastes and of homogenized food residues with defibered kitchen wastes (food waste) as the main substrate was examined to improve biogas production. Although the biowaste digester was operated already at high organic loading (OLR) of 12.3kgCODm^-^3d^-^1 during the week, addition of co-substrates not only increased biogas production rates but also improved total biogas production. By feeding the two co-substrates up to 20kgCODm^-^3d^-^1 gas production followed the increasing OLR linearly. When the OLR was further increased with food waste, not more gas than for 20kgCODm^-^3d^-^1 OLR was obtained, indicating the maximum metabolic capabilities of the microbes. During weekends (no biowaste available) food waste could substitute for biowaste to maintain biogas production. Addition of press water or food waste to biowaste co-digestion resulted in more buffer capacity, allowing very high loadings without pH control.

Copyright © 2010 Elsevier Ltd. All rights reserved.

DOI: 10.1016/j.biortech.2010.03.123
Version: za2963e q8zad q8zb9 q8zce q8zd0 q8zec q8zfe q8zg4

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