Use of hydrocyclones for centrifugal dewatering of waste water sediments

Abstract

This article investigates the effectiveness of hydrocyclones in the separation of abrasive inclusions from the sediment of primary sedimentation tanks at the Orekhovo-Zuevo aeration station. The studies were performed in a pressure hydrocyclone which was fed with wet sediment from the primary sedimentation tanks with a water content of 93.8-95.5% and an ash content of 35.1-45.1%. The flow rate characteristics and the qualitative indices of the hydrocyclone operation, depending on its geometric parameters and inlet pressure, were determined. In the process of sediment separation in the hydrocyclones, the moisture content of the drained fluid rises above and that of the slime falls below the moisture content of the wet sediment. It is established that the pattern of change in the moisture content of the separation products, the content of the dry and mineral matters, and the efficiency of separation of the dry and mineral matters with the change in the pressure at the hydrocyclone inlet and its geometric parameters in the case of activated sludge treatment is similar to the pattern of change in the corresponding indices in the cases of hydrocyclone processing of the sediment from primary sedimentation tanks.