Could Ozonation Technology Really Work for Mitigating Air Emissions from Animal Feeding Operations?

摘要

Among various mitigation technologies for ammonia (NH_3) emission cor trol at animal feeding operations (AFOs), room ozonation technology is the most controversial. This paper aims to present full perspectives of ozonation techniques through a literature review and a series of laboratory experiments. In the literature review, ozone chemistry was summarized to address (1) ozone and NH_3 reactions, (2) ozone and odor reactions, (3) ozone and particulate matter reactions, and (4) ozone and microorganism reactions. A series of laboratory experiments were conducted in a dual large outdoor aerosol smog chamber (270 m~3). NH_3 and fine particle number concentrations from ozone-treated and control experiments were compared. The experimental results indicated that (1) ozone has no significant effect on NH_3 emissions/ concentrations or NH_3 decay of an outdoor chamber; and (2) with ozone treatment, high concentration of particles in the "high-risk" respiratory fraction (in submicron range) are generated.