Abstract: Apparatus is provided to allow a relatively high pressure differential to build up across the filter element and layer of filter media in a filter aid filtration vessel.A process and apparatus are provided for reusing filter media in a filter aid filtration system.A process and apparatus are provided for drying filter cake in a filtration vessel to facilitate its disposal. Pressurized gas is used to assist in blowing the filter cake off of the filter elements.A process and apparatus are provided for draining the heel of a filter aid filtration vessel as filtrate.

Abstract: An upflow eductor induced air separator providing a main separator tank receiving a continuous fluid flow divided into a plurality of aeration chambers with each aeration chamber providing eductor means wherein gas is educted into an upflow water stream with contaminants of suspended oil and solids in the continuous fluid flow adhering to the gas bubbles for collection in a froth layer on the top portion of the tank. There is further provided a V-shaped collection channel extending substantially the length of the tank for removal of collected oil following the sensing activation of a valve allowing the fluid level within the tank to rise, with oil and solids ladened froth being removed through the valve. There is further provided a recirculation pump for recirculating the effluent which exits the tank following the aeration process, and a chemical injection mechanism for injecting a mixture of chemical flocculating agent entering the main separating tank.