Reprinted, with permission, from the proceedings of: Mitigating Air Emissions From Animal Feeding Operations Conference.
In The Netherlands, Germany and Denmark packed-bed biotrickling filters and acid scrubbers for removal of ammonia from exhaust air of animal houses are off-the-shelf techniques for ammonia removal (70 - 95% average removal). At the moment a new generation of so-called "multi-pollutant scrubbers" is being developed and tested that not only removes ammonia but also aims for significant removal of odor and particulate matter (PM10 and PM2.5) from the air. Recently a 3-year research program has started that monitors and aims to improve the performance of five farm-scale multi-pollutant scrubber from different manufacturers. The preliminary results show that the average ammonia removal is relatively high (83%, n = 7) but that the average removal of odor (40%, n = 8) and particulate matter (PM10: 43%, n = 2; PM2.5: 42%, n = 2) needs to be improved further.
|Acid Scrubber||Biotrickling Filter||Multi-pollutant scrubber (3-stage water/acid/biotrickling)|
|Operational Costs (year^1):|
|Electricity use ((€ 0.11 kWh^-1)||3.3||3.8||3.7|
|Water use (€ 1.0 m^-3)||0.6||1.7||0.6|
|Chemical use (€ 0.6 L^-1 H2SO4, 98%)||1.4||n/a||0.7|
|Water discharge [b||0.6||2.5||1.0|
|Total operational costs (year^-1)||10.8||14.3||13.5|
[a] The investment costs are based on a maximum ventilation capacity of 60 m3 animal place-1 h-1.
[b] Water disposal costs are assumed of € 10/m3 for discharge from acid scrubbing and € 2/m3 for discharge from biotrickling or water scrubbing. For the multi-pollutant scrubber, discharge water from the biotrickling or water scrubbing step is reused in the acid scrubbing step. The systems do not include a denitrification unit which might significantly decrease water discharge costs.
[c] n/a = not applicable.
Roland W. Melse, Nico W.M. Ogink, Bert J.J. Bosma; Animal Sciences Group, Wageningen University and Research centre, The Netherlands
Point of Contact:
Roland W. Melse, firstname.lastname@example.org
The information provided here was developed for the conference Mitigating Air Emissions From Animal Feeding Operations Conference held in May 2008. To obtain updates, readers are encouraged to contact the author.