This research investigated the chemodynamics of the underdrains found at swine- raising facilities. The maintenance of aerobic conditions and introduction of aerobic bacteria to expedite the treatment process and control odor formation were investigated. A pilot-scale system that mimicked an industrial swine-raising facility was used in this study. Aeration and aeration with bacterial seed additions were evaluated against a standard pit recharge system, which served as the control. The effectiveness was measured using water quality testing, odor assessments by a human sensory panel, and air phase measurements of hydrogen sulfide and ammonia. The results indicated that both aeration and aeration with seeding under low loading condition were effective in reducing BOD, COD, volatile acids, and phenol concentration as well as overall odor intensity as compared to the control; however, neither was effective in reducing the ammonia, phosphate, or total solids concentrations. At mid and high loadings, little benefit was observed
