The ATUs developed by IRDA have a great potential to reduce ammonia from livestock building exhaust air. After a start-up phase of a few weeks, they showed good efficiencies during the whole year they were monitored, with greater performance during the cold season (low airflow and high concentration). Since ammonia emissions are higher in the warm season, it would be important to improve ATUs efficiencies during this period. Flushing the nutrient solution efficiently seems to be the key to maintain proper performance according to inlet fluctuations. The conductivity could be a good indicator (simple and cheap) to adjust the flush and maintain optimal operating conditions. Moreover, the valorization by fertigation of the waste water produced (rich in nitrogen) needs to be studied.
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