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Improper treatment of pig slurry has seriously polluted water courses and reservoirs in rural settlement. The SNU research team estabished an integrated system for treatment of pig slung, including the separation and the filtration processes. The correlation of the physicochemical factors and the bacterial population in the SNU system was investigated to explore the characteristics of the microbes involved in organic degradation. The findings drawn from this study were the followings : (1) The concentration of NH₄^(-)-N and PO₄^(-)-P has decreased with the processes while that of NO₂^(-)-N and SO₄^(2-) has increased. (2) The number of total bacteria did not change with the process from S1 to S2 while that of heterotrophic bacteria including the functional groups of bacteria has greatly increased. (3) The growth rate of the ammonia oxidizer bacteria and the nitrite oxidizer bacteria at S3 was much higher than that at Sl and S2. (4) The functional groups of bacteria and the activity of dehydrogenase enzyme showed significant positive and negative correlation (-0.57∼0.52, p$lt;0.01) with NH₄^- (5) The effect of the physicochemical environmental factors on bacteria populations in the SNU system was investigated by the correspondence and multi-dimensional scaling analysis. The analysis revealed more environmental factors involved in determination of the bacteria population at S2 and S3 than those at S1. No effect of heterotrophic bacteria, thermophilic heterotrophic bacteria, NO₂^-, and SO₄^(2-) on the bacteria population was found. Further study should be performed more accurately to identify if the physical factors including temperature, and aeration rate, influence the bacteria population in the SNU system.
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