Conception d’un système de lavage d’air partiel et évaluation de son efficacité

Nadine Guingand et al., 52e Journées de la Recherche Porcine (FRA), 4 et 5 février 2020, p. 345-346, poster

Poster.

Le lavage d’air est reconnu techniquement et réglementairement comme une voie efficace de réduction des émissions de particules, d’ammoniac et d’odeurs (Santonja et al., 2017). Cependant, une des limites au développement de cette technique est son coût (entre 10 et 50 €/place de porc) auquel vient s’ajouter sa consommation d’eau (de 0,3 à 0,8 m3 /place de porc). Aussi, pour favoriser son développement tout en maintenant son efficacité sur les paramètres de qualité de l’air, un nouveau concept de traitement de l’air a été développé par l’IFIP, en collaboration avec un équipementier spécialisé en élevage porcin. L’objectif de l’étude est de mettre au point un système combinant ventilation et lavage d’air qui permette de réduire le coût du traitement tout en maintenant une efficacité sur l’ammoniac. 

ENG

Design of a partial air scrubber and evaluation of its effectiveness

Poster.

Air scrubbing is known to be an effective technique to reduce ammonia, odours and particles emitted by pig farms. It was also recognized as a Best Available Technique in the most recent BREF for Intensive Rearing of Poultry or Pigs of the European Union. Nevertheless, its cost and water consumption are the most important factors hindering development of this technique. Removing these obstacles, a new concept of ventilation combining under- and over-floor extraction was developed and connected to a classic bioscrubber one-third the size. Ambient air was under-floor extracted and treated by the bioscrubber until the airflow rate reached 30% of the maximum rate. Over 30 %, air was extracted through a chimney duct and not treated. An initial trial was performed at the IFIP experimental farm on a batch of 60 fattening pigs during winter (Nov. 2018 to Feb. 2019). Pigs were kept on a fully slatted floor with slurry stored in the pit during the entire fattening period. Monitoring of airflow rate showed proper functioning of the mixed ventilation system. Ammonia emitted by pigs before treatment was 9.9 ± 3.2 g N-NH3 per pig per day. The reduction in ammonia emissions by the partial air scrubber was 37% for the 30% extracted air. Including untreated emissions in the chimney (0.9 ±0.6 g N-NH3 per pig per day), the total reduction in ammonia emissions from the room was 34%.