Utilization of biofilter for ammonia elimination in composting plant
2004
Omrani, G.,Tehran University of Medical Sciences (Iran). Dept. of Environmental HealthEngineering
This study presents the interim findings of a research project undertaken to develop anintegrated NH, control strategy. This is especially important for treating composing facilityoff-gases where significant concentrations of ammonia are often present. A closed-fieldbiofilter with dimensions 1 x 1 m was evaluated for its effectiveness in treating gasesemanating from aerobic compost pilot. Air samples were collected for the determination ofammonia using detector tubes method. Ammonia emission had a positive correlation with hightemperatures and alkaline pH levels during the aerobic composting process. In this researchtwo substrate were compared as a biofilter medial. The results showed that the bed No. 1 (50%peat and soil, 33.3% compost, 16.7% sand) was able to reduce ammonia emissions by maximum97-99%. The overall ammonia removal efficiencies for sampling locations in bed No. 2 (53.3%sawdust, 27.5% clay, 18.2% straw) is approximately 94%. It is less than compost and peat filterefficiency but this media can provide good performance under optimum conditions. Theperformance of the biofilter was the most sensitive to moisture content and microbial growthconditions such as pH, temperature, oxygen, adequate nutrients, absence of toxic compoundand so on.
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