Processing of biowaste by anaerobic composting to plant growth substrates
Kitchen derived biowaste was fermented in a 40 l digester at 55 degree C with a loading of 5.2 g VS/l.d and an average residence time of 42 days. This resulted in an average biogas production rate of 3.6 l/l.d. Different types of paper were investigated for their anaerobic biodegradability; the conv...
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| Main Authors: | , , , , , |
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| Format: | Book |
| Language: | eng |
| Online Access: | Get full text |
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| Summary: | Kitchen derived biowaste was fermented in a 40 l digester at 55 degree C with a loading of 5.2 g VS/l.d and an average residence time of 42 days. This resulted in an average biogas production rate of 3.6 l/l.d. Different types of paper were investigated for their anaerobic biodegradability; the conversion on VS-basis ranged from 17% for a regular newsprint to 100% for a bleached cellulose. Compared to MSW-digest, the biowaste-digest was found to be a NPK rich organic fertilizer with low levels of heavy metals. The moist digest was supplemented with 40% peat (w/w) to attain 25% dry matter and subsequently allowed to compost aerobically during 7 days at ambient temperature to a mature endproduct. Horticultural plants were grown on various endproduct/peat mixtures. The latter exhibited no phytotoxicity and performed in some cases better than optimal reference substrates. The blending of the wet digest with peat thus allows to obtain in a very short process time an excellent plant substrate. |
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| ISSN: | 0273-1223 1996-9732 |