Interactions and microbial variations in a biotrickling filter treating low concentrations of hydrogen sulfide and ammonia.

A lab-scale biotrickling filter (BTF) packed with porcelain Rasching ring and ceramsite was applied for co-treating of low concentrations of hydrogen sulfide (HS) and ammonia (NH), as major pollutants typically found in e.g., intensive livestock production facilities.

Microbial and isotopomer analysis of NO generation pathways in ammonia removal biofilters.

Ammonia removal biofilters can be a potential source of nitrous oxide (NO) production as a result of microbial nitrification and denitrification. In this study, these two NO generation pathways was quantified using isotopic site preference values (SP, 33‰ for nitrification and 0‰ for denitrification) in a 204-d operation. Tests with two moisture conditions (45% and 55%) and three inlet NH concentrations (35, 18 and 0 ppmv) were performed.