Abstract
ABSTRACT SWINE manure was treated in an oxidation ditch system under aerobic condition for odor control. The effects of manure concentration and retention time on the concentration of various nitrogenous compounds in the oxidation ditch were evaluated. Three manure concentrations (50, 33 and 25%, i.e. manure diluted 1:1, 1:2 and 1:3 manure:water); and four retention times (6, 12, 18 and 24 h) were studied. The total solids in the manure were 6, 4 and 3% respectively. The reductions in the total Kjeldahl nitrogen and ammonium nitrogen and the gain in organic nitrogen were related to both the manure concentration and retention time. The reduction in ammonium nitrogen was due to the processes of nitrification, ammonium assimilation and ammonia volatilization.
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