Design and establishment of a biofilter for treatment of manure methane emissions

Le résumé fourni par la source

During the storage of livestock manure in tanks, anaerobic degradation of organic material results in the production and emission of CH 4 . This study tested a biofilter designed for CH 4 oxidation as a potential technology for mitigating CH 4 emissions from covered manure storage tanks. A full-scale biofilter (400 m 2 ) was built next to a pig manure tank (4.400 m 3 ). Total yearly CH 4 emissions from the manure tank prior to the establishment of the biofilter varied between 2.1 and 21.1 kg h −1 . With a pump flow of ∼ 100 m 3 h −1 , it was possible to collect 75 % of the produced gas from the headspace of the tent covered manure tank. The average biofilter CH 4 load for the first year was 4.6 kg CH 4 h −1 , and the total yearly load was 42 tons of CH 4 . The biofilter was monitored for 1.5 years by measuring the collected gas, gas concentrations in the gas distribution layer and the temperature and moisture in the CH 4 oxidation layer. Gas concentrations in the gas distribution layer were similar to inlet gas concentrations, indicating efficient gas transportation and distribution in the biofilter, whilst biofilter surface CH 4 screenings revealed only a few localised emission hotspots. The annual average temperature in the biofilter was 49 °C and was related to the CH 4 load. When the CH 4 load to the biofilter was stable and above 2 kg CH 4 h −1 , the temperature in the oxidation layer was found to be around 57 °C or higher, indicating that CH 4 oxidation was occurring.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.