By Mohamed Samer
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Extra info for Abatement Techniques for Reducing Emissions from Livestock Buildings
The operating principle of a bioﬁlter is that the contaminated air from the building is passed through a chamber which contains a moist packing medium. Provided moist conditions are maintained, naturally occurring aerobic bacteria populate the packing medium. As the air flows through the bioﬁlter, the undesirable components are dissolved in the moisture on the packing medium where they are sequestrated, where the aerobic bacteria oxidize them, forming principally carbon dioxide, water, and mineral salts (Phillips et al.
Additionally, bioﬁltration has been proved to be effective for removing low concentrations of easily biodegradable constituents from air. Together with other advantages such as low cost and less maintenance requirement, bioﬁltration is a promising air pollution control (APC) for reducing odor emission. Several researches have concentrated on media choice, retention time determination, control of operating parameters, and reducing the capital costs. 57 m3 s−1 (Yang and Tugna 1999). Abd El-Bary (2003) elucidated the advantages and disadvantages of bioﬁltration process.
2 Aerobic treatment and utilization of livestock manure (Amended, translated, redrawn and adopted from Burton et al. 5 Dietary Manipulation The primary source of NH3 is nitrogen (N) in the feed. The better the nitrogen utilized by an animal, the less the nitrogen will be excreted by the animal. It is recommended that the exact amounts of amino acids in the diet be provided to meet the nitrogen requirements of the animal. However, the animal requirements change with age and weight (CIGR 1994). Manipulation of livestock diets to affect manure production, composition, and odor is an effective emission abatement technique.