Sewage enriched by kitchen waste: potential for hydrogen production by bioprocesses

Bioreactors (jacketed systems) have been operated in batch using sewage from the local wastewater treatment plant enriched by two different organic waste fractions, i.e., kitchen waste artificially prepared according to literature and a real kitchen waste originating from a university restaurant.

The realisation that society has to adopt a more sustainable life style implies among others the reduction of the amount of waste and the search for alternative energy sources. In this study, domestic wastewater is given a second life as dilution or pretreatment medium for a concentrated waste stream, i.e., kitchen waste collected separately in Flanders. While currently domestic wastewater is treated in conventional sewage wastewater treatment plants by means of aerobic activated sludge systems, this study aims to treat the wastewater enriched by kitchen waste anaerobically with the recovery of hydrogen as an energy carrier. A direct anaerobic treatment with the recovery of energy is not feasible since the wastewater is too low in energy containing compounds and has a low temperature. Biohydrogen reactors are used to treat sewage enriched by the organic fraction of household wastes, also referred to as kitchen waste or by the waste streams from university restaurants. The biogas produced from these matrices at mesophilic condition is continuously monitored, besides hydrolysis of the solids and formation of all fermentation products. Besides the direct production of a valuable energy carrier like hydrogen, the resulting effluent which still contains a lot of soluble COD can be used for a second treatment yielding biogas and/or electricity in bioelectrochemical systems.

Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2008 (Oktober 2008)
Seiten: 7
Preis inkl. MwSt.: € 7,00
Autor: Dr. ir. Karolien Vanbroekhoven
Doga Arslan
B. Baeyens
B. Calli
Ludo Diels

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