Abstract
The experiments of synthetic wastewater treatment were carried out by using a bench-scale unit of submerged membrane separation activated sludge process, in order to examine the effect of organic loading of wastewater and sludge retention time "SRT" on accumulation of dissolved organic compounds in the membrane separation tank. We also investigated the relations between the accumulation of dissolved organic compounds and the performance of membrane permeation. As a result, it was found that the organic compound accumulation in the tank caused the membrane fouling. Low organic loading or low SRT by frequent sludge drawing was effective against the accumulation of dissolved organic compounds. Furthermore, under the condition of very low organic loading the sludge concentration in the tank was kept constant without drawing the sludge from the tank.
