TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The step of collecting the brown grease into a container, further comprises: separating free-oil and food solids from water in the container; draining off water from the container; collecting water drained from the container; and filtering collected water through a filter to produce filtered water. The process further comprises: providing a separator; and separating debris from the brown grease prior to collection to the container. The process further comprises: providing a mixing tank having a mixing tank discharge pipe in communication with the container; transferring the brown grease to the mixing tank; mixing the brown grease in the mixing tank; adjusting pH of the brown grease in the mixing tank with the first chemical treatment to produce an adjusted brown grease phase; and transferring the adjusted brown grease phase to the container through the mixing tank discharge pipe. The process further comprises: providing an anionic mixing unit having agitation device and having a mixing unit discharge pipe in communication with the mixing tank discharge pipe, where the mixing unit has a mixture of water and an anionic copolymer; mixing the water and the anionic copolymer in the mixing unit to produce a copolymer treatment mixture; discharging the adjusted brown grease phase into the mixing tank discharge pipe; and discharging the copolymer treatment mix into the mixing tank discharge pipe. The process further comprises: providing a cationic mixing unit having agitation device and having a cationic mixing unit discharge pipe in communication with the mixing tank discharge pipe at the end closest to the container, where the cationic mixing unit have a mixture of water and an cationic copolymer being a cationic copolymer mixture; adding the cationic copolymer mixture at an end of the mixing tank discharge pipe to produce a reaction mixture; filling the container with a predetermined amount of the reaction mixture; and reacting the reaction mixture for a period of time, that time being a reaction time. The process further comprises: running off wastewater from the container to a wastewater storage unit; and transferring the resulting solids from the container to a storage container. EXAMPLE - No suitable example given.