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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition Veolia Water Solutions and Technologies: OPUSTM – optimized pretreatment and separation technology N.A. Water Systems, a Veolia Water Solutions and Technology company, designed the OPUSTM system. OPUSTM is a proprietary optimized pretreatment and unique separation process for desalination of water with high concentrations of sparingly soluble solutes (e.g., SiO2, CaSO4, and Mg(OH)2), organics, and boron. The system is able to achieve high recovery with high purity product water through the use of extensive pretreatment processes prior to water contacting both IX and RO sub-systems. A system schematic is shown in Figure 44. Figure 44. Process schematic of Veolia Water Solutions and Technologies: OPUSTM CBM produced water treatment system (Source: [153]). The process first performs acidification and degasification of the raw feed water. This is followed by an aggressive, conventional coagulation, flocculation, and high-rate plate settler sedimentation process, which is termed MultifloTM chemical softening in the OPUSTM literature [153]. After this step, the feed stream should be devoid of nearly all high-molecular-weight organic molecules and oxidized metals (particularly iron and manganese). Additionally, colloidal silica is partially removed by co-precipitation. Decant from the sedimentation basin is then filtered by a packed-bed media filtration column, which removes any microflocs and most suspended solids that did not settle out in the plate settlers. The media filter may also achieve additional removal of low to medium molecular weight hydrophobic organic molecules, including any remaining oil and grease. Filtrate from the media filter is then processed through a mixed, packed-bed IX column for further water softening and removal of microorganisms. A cartridge filter is then employed to remove any IX resin or any remaining suspended solids prior to contact with the RO membranes. The water is then pressurized and treated by BWRO membranes at an elevated pH. Operating the RO elements under this condition reduces the fouling propensity of silica and increases the rejection of both silica and boron. In April of 2008 the OPUSTM system was field tested at a steam-enhanced oil production site in San Ardo, CA. The tested OPUSTM system was designed to treat 2.1 MGD (50,000 bpd) of water with high boron, silica, and organics concentrations [154]. Water recovery for the OPUSTM is described by the manufacturer as high, and may be equivalent to that of other high recovery RO systems that operate with elevated pH. OPUSTM product literature indicates removals for TDS of 99.6%, TOC of 99%, silica of 99.9%, and boron of 99.4% [154]. Sodium removal is not indicated, however it may be considered similar to that for BWRO processes. 119PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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