Abstract: A method for the treatment and disposal of sewage sludges containing chlorides (NaCl) as from infiltrating salt water, which involves heat treatment capable of producing readily disposable sludges, due to the resulting destruction of pathogenic organisms and improved filtrability of the sludge, featuring the washing displacement of NaCl from the sludge preceding the heat treatment operation, for protection of the sludge heating equipment.

Abstract: Filter drum for continuous drum filter featuring longitudinal divider strips or channel members spot welded to the drum cylinder, with caulking material provided underneath the channel member along the length thereof, against leakage between mutually adjoining filtrate chambers.

Abstract: An electro-ultrafiltration process is conducted in a tank in which the cathode and anode regions are separated by an anisotropic ultrafiltration membrane. A pressure differential is applied across the membrane and the fluid component of the bath moves through the membrane under the influence of this pressure for removal from the tank. Current applied between the electrodes develops an additional flow of the fluid component of the bath through the membrane. Due to the special characteristics of the anisotropic membrane, the total flux through the membrane under these conditions greatly exceeds the flux attributable to the individual effects of pressure and current. This process is especially useful when applied in electrophoretic coating systems, for it can establish a stable bath composition and it also tends to maintain the membrane in an essentially unfouled condition.

Abstract: Sewage sludge of a uniformly high solids content is pumped from a primary settling tank to a digester or thickener by an air operated spring assisted diaphragm pump.