| 20090057234 | METHOD FOR MAKING BROWN GREASE - A method and system for recovering grease from wastewater is disclosed. According to one embodiment of the present invention, the method includes receiving wastewater comprising an aqueous phase and an organic phase, wherein the organic phase comprises solids and grease; pretreating the wastewater to produce a waste sludge stream comprising water, solids, and grease, wherein a substantial amount of the solids and grease from the wastewater are extracted into the waste sludge stream; separating the waste sludge in a first separation stage to provide a first separation phase consisting essentially of solids, and a second separation phase comprising an immiscible liquid mixture of grease and water; and separating the second separation phase to provide a third separation phase consisting essentially of water and a fourth separation phase consisting essentially of grease. According to another embodiment of the present invention, the system includes a pretreatment facility capable of extracting a substantial portion of the solids from the wastewater stream to produce a waste sludge; a first separator capable of separating the waste sludge into a first separation phase consisting essentially of solids from the waste sludge, and a second separation phase comprising an immiscible mixture of water and grease; a second separator capable of separating the second separation phase into a third separation phase consisting essentially of water, and a fourth separation phase consisting essentially of grease. | 03-05-2009 |
