Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Regeneration of a Compost Biofilter Degrading High Loads of Ammonia by Addition of Gaseous Methanol
The long-term stability of a biofilter loaded with waste gases containing NH3 concentrations larger than 100 ppmv was studied in a laboratory-scale compost reactor. At an empty bed residence time (τ) of 21 sec, elimination capacities of more than 300 g NH3/m3/day were obtained at elimination efficiencies up to 87%. Because of absorption and nitrification, almost 80% of the NH3-N eliminated from the waste gas could be recovered in the compost as NH4+-N or NO2 −/NO3 −-N. The high elimination capacities could be maintained as long as the NH4+/NOx concentration in the carrier material was less than 4 g NH4+/NOx −-N/kg wet compost. Above this critical value, osmotic effects inhibited the nitrifying activity, and the elimination capacity for NH3 decreased. To restore the biofilter performance, a carbon source (methanol) was added to reduce NH4+/NOx − accumulated in the compost. Results indicate that methylotrophic microorganisms did convert NH4+/NOx − into biomass, as long as the NO3 − content in the compost was larger than 0.1 g NO3 −-N/kg compost. Removal efficiencies of CH3OH of more than 90% were obtained at volumetric loads up to 11,000 g CH3OH/m3/day. It is shown that addition of CH3OH is a suitable technique for regenerating the compost material from osmotic inhibition as a result of high NH3 loading. The biofilter was operated for 4 months with alternating loading of NH3 and CH3OH.
Regeneration of a Compost Biofilter Degrading High Loads of Ammonia by Addition of Gaseous Methanol
The long-term stability of a biofilter loaded with waste gases containing NH3 concentrations larger than 100 ppmv was studied in a laboratory-scale compost reactor. At an empty bed residence time (τ) of 21 sec, elimination capacities of more than 300 g NH3/m3/day were obtained at elimination efficiencies up to 87%. Because of absorption and nitrification, almost 80% of the NH3-N eliminated from the waste gas could be recovered in the compost as NH4+-N or NO2 −/NO3 −-N. The high elimination capacities could be maintained as long as the NH4+/NOx concentration in the carrier material was less than 4 g NH4+/NOx −-N/kg wet compost. Above this critical value, osmotic effects inhibited the nitrifying activity, and the elimination capacity for NH3 decreased. To restore the biofilter performance, a carbon source (methanol) was added to reduce NH4+/NOx − accumulated in the compost. Results indicate that methylotrophic microorganisms did convert NH4+/NOx − into biomass, as long as the NO3 − content in the compost was larger than 0.1 g NO3 −-N/kg compost. Removal efficiencies of CH3OH of more than 90% were obtained at volumetric loads up to 11,000 g CH3OH/m3/day. It is shown that addition of CH3OH is a suitable technique for regenerating the compost material from osmotic inhibition as a result of high NH3 loading. The biofilter was operated for 4 months with alternating loading of NH3 and CH3OH.
Regeneration of a Compost Biofilter Degrading High Loads of Ammonia by Addition of Gaseous Methanol
Demeestere, Kristof (Autor:in) / Langenhove, Herman Van (Autor:in) / Smet, Erik (Autor:in)
Journal of the Air & Waste Management Association ; 52 ; 796-804
01.07.2002
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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