It was based on the finding, made in the 50-th by the German engineer Karl Imhoff, who stated that the treatment efficiency of 60-80 percent could be achieved in highly loaded activated sludge basins.
It was based on the finding, made by the German engineer Karl Imhoff in the 50th. Imhoff stated that the treatment efficiency of 60-80 percent could be achieved in highly loaded activated sludge basins.