Produced waters (PWs) are waste streams generated during the crude oil extraction processes. The management of these wastewaters is complicated by the large volumes extracted during the oil recovery operations: these depends on the life of the oil-well: typically. 3 barrels of PWs on average are produced for each barrel of oil extracted. After oil separation. https://www.spidertattooz.com/Visual-Comfort-Primitive-Swing-Arm-Sconce-with-Linen-Shade/