Introduction of High Performance Activated Sludge

Abstract

We have studied activated sludge（AS）in order to improve the efficiency of wastewater treatment. We previously reported that the performance of each mill's AS was different, and that the high performance AS enabled us to improve degradability of other mill's wastewater on a bitch experiment.At the next step, we used a continuous experimental apparatus, which have the condition similar to a mill's plant. Using this apparatus, we conducted the experiment assumed that the high performance AS is introduced into the mill having the problem of wastewater treatment. As a result, we found out that blend of 20％ of the high performance AS with the conventional AS made degradability of wastewater improved. Genetic analysis revealed that original bacteria of the high performance AS existed in the blend AS during treatment of wastewater. In addition, substrate utilization assay showed that carbon source utilization profile of the blend AS was more similar to that of the high performance AS than the conventional AS, suggesting that bacterial community in the blend AS became similar to that of the high performance AS after blend.