ISHS Acta Horticulturae 534: International Conference and British-Israeli Workshop on Greenhouse Techniques towards the 3rd Millennium
DEPOLLUTION OF LANDFILL BIOGAZ FOR GREENHOUSE APPLICATIONS |
| Authors: | N. Bentounes, A. Jaffrin, B. Dalichamp, L. Urban |
| Keywords: | Biogaz, greenhouse, heat, carbon dioxide |
| Abstract:
Most landfills produce biogaz as the result of anaerobic digestion of organic wastes. The calorific content of methane is only a small part of the potential benefits of using such a biogaz in greenhouse production: CO2 enrichment is known to bring a large yield increase and a clear quality improvement in ornamental productions. Burning corrosive biogaz in greenhouse boilers requires specific stainless steel components with enlarged sections, and injecting bioCO2 in greenhouses can only be done after proper purification of the exhaust gases. This is currently being studied under a joint venture by INRA and a French boiler manufacturer on a landfill site in the south-east of France. A 150 kW natural gas boiler with an immersed flame has been modified to accept biogaz. The detailed content of combustion gases has been analysed before and after a wet purification process. This modified boiler is designed to provide heat and bioCO2 to an experimental greenhouse rose culture. Two 288 m2 plastic tunnels, one with bioCO2 and one control, are equipped with high IR performance PE-EVA single films, cooling pad systems and soilless cultural systems. The bioCO2 injection is combined with the cooling ventilation rate. In the enriched greenhouse gas, it is possible to maintain a 1900 ppm CO2 concentration level with a 30 vol/h ventilation rate through cooling pads, which insures air temperatures well below 35°C in summer time. The experiment is intended to check the absence of phytotoxicity on rose plants and to analyse the benefits on cut flower production. This study is a prerequisite for larger horticultural projects using landfill biogaz. | |
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