| 초록 |
Using combined culture of suspended activated sludge and immobilized C. vulgaris in one reactor, a simultaneous reduction of nutrients (nitrogen and phosphorus) and COD was achieved in municipal wastewater. Compared to the single system of activated sludge, considerably higher removal of nutrients was accomplished by combined culture, which is an indication of the symbiotic association between activated sludge and C. vulgaris. The symbiotic combined system exhibited 93% - 99% of nutrients removal after only 2.5 days of treatment. For reductions of organic pollutants, however, the performance of combined culture was not as good as for nutrients (showing around 50% removal of COD) due to the release of organic carbon content by C. vulgaris during treatment. By increasing inoculum ratio of activated sludge and C. vulgaris (from 1 to 10), combined culture obtained less removal of nutrients, and results have shown that the optimum inoculum ratio was 1:1. |
