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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition AGV Technologies: Wiped Film Rotating Disk (WFRD) AGV Technologies, Inc. (AGV) developed a new Wiped Film Rotating Disk (WFRD) system for produced water treatment. The WFRD is a vapor-compression distillation technology that can also operate in the MED mode if thermal energy is available [138]. The WFRD system uses rotating disks as heat transfer surfaces. A thin microfilm layer of input water (produced water) is applied to the outside surface of the rotating disk. Superheated vapor in the cavity of a disk condenses on the inside surface. A slight temperature difference across this disk allows heat to flow from the condensing liquid to the evaporating fluid, driving evaporation and recycling of the latent heat of evaporation. This evaporated vapor moves to the next disk assembly (effect) and is condensed, providing the energy to evaporate more feed water [138]. A schematic for a five-effect WFRD unit operating in the vapor compression mode is illustrated in Figure 34. Figure 34. Schematic flow diagram for a five-effect WFRD unit operating in the vapor compression mode with each slanted line representing the rotor in each of the five effects [138]. AGV Technologies claims that the WFRD is designed to improve heat transfer efficiency and reduce scaling and fouling [138]. Resistance to heat flow in distillation is determined by the thickness of the liquid layer on the evaporation and condensation surfaces. The WFRD design minimizes this thickness; resulting in very thin condensate and feed films on the heat transfer surfaces. The WFRD technology achieves a heat transfer coefficient of 25 kW m-2 °C-1. In 2004, the WFRD technology was tested using CBM production water collected from two sources – the Powder River Basin (Northeast Wyoming / Southeast Montana, with TDS 1,068 mg/L) and the San Juan Basin (New Mexico, with TDS 23,000 mg/L). Produced water from each source was treated using a prototype WFRD test unit; a single effect system with two 24-inch disk sets. It was configured to operate at an 8 to 1 brine recycle ratio and an evaporator temperature of 122 °F. The system is capable of producing a maximum of 2.6 gal per hour. Each run processed 5 gallons of produced water with recovery rate of 90%. The AGV technology removed 99% of the TDS from both raw produced waters without any adjustments, pretreatment, or additional equipment. TOC was reduced by 86% for the San Juan samples and 70% for the Powder River samples. While the percentage reduction for some inorganic constituents and TOC 98PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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