Biofiltration of WWTP sludge composting emission at contact times of 2 to 8 seconds
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The performance of a biotrickling filter for the abatement of composting emissions was evaluated at short contact times of 2 to 8 seconds. The effect of EBRT, pH control and water renovation rate were evaluated. The average elimination capacity was 13 and 3.3 g N/C m-3 h -1 for ammonia and VOCs, respectively, and the maximum EC obtained during a doping process were 40 and 20 g N/C m -3 h -1 . Biotrickling filters appear as a better alternative than biofilters due to their controllability. However, water renovation becomes a critical parameter to avoid substrate inhibition by nitrite and ammonia accumulation. Not only ammonia absorption is negatively affected at low renovation rate but it is also affected the biological process. A decrease of 40 % was detected in the nitrification step when the hydraulic residence time increased from 2 to 5 hours. Results presented herein demonstrate that high removal efficiencies can be achieved for composting emissions in a biotrickling filter operated at short contact times which entails a substantial reduction of operational and investment costs in comparison to traditional techniques.
CitationDorado, A.D.; Gabriel, D.; Gamisans, J. Biofiltration of WWTP sludge composting emission at contact times of 2 to 8 seconds. A: IWA Specialized Conference on Odors and Air Emissions jointly Conference on Biofiltration for Air Pollution Control. "5th IWA Specialized Conference on Odors and Air Emissions Jointly Held With 10th Conference on Biofiltration for Air Pollution Control". 2013, p. 1-8.