Carbon Turnover and Ammonia Emissions during Composting of Biowaste at Different Temperatures
2007 (English)In: Journal of Environmental Quality, ISSN 0047-2425, Vol. 36, no 5, 1512-1520 p.Article in journal (Refereed) Published
The effects of different process temperatures (40, 55, and 67°C) during composting of source-separated household waste were studied in a 200 L compost reactor at an oxygen concentration of 16%. The overall decomposition measured as carbon mineralization, decomposition of different carbon constituents, and the dynamics of nitrogen mineralization and the microbial community, are reported. Ammonia emissions at 67°C were more than double those at lower temperatures, and they were lowest at 40°C. The decomposition rate, measured as CO2 emission, was highest at 55°C. Decomposition of crude fat was slower at 40°C than at 55 and 67°C. The peak in microbial biomass was largest in the run at 40°C, where substantial differences were seen in the microbial community structure and succession compared to thermophilic temperatures. Biowaste composting can be optimized to obtain both a high decomposition rate and low ammonia emissions by controlling the process at about 55°C in the initial, high-rate stage. To reduce ammonia emissions it seems worthwhile to reduce the temperature after an initial high-temperature stage.
Place, publisher, year, edition, pages
2007. Vol. 36, no 5, 1512-1520 p.
IdentifiersURN: urn:nbn:se:uu:diva-16745DOI: 10.2134/jeq2006.0253OAI: oai:DiVA.org:uu-16745DiVA: diva2:44516