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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition Aqua-Pure - Mechanical Vapor Recompression (MVR) Evaporation The NOMAD systems are designed and built by Aqua-Pure Ventures Inc., based in Calgary, Alberta, Canada, and operated by Granbury-based Fountain Quail Water Management. This MVR evaporation NOMAD system is an energy efficient process that uses a very compact welded cassette heat exchanger with a plate-and-frame construction and a rising-film design. With this design, boiling occurs on a wet surface, minimizing scale deposition that occurs in conventional thermal technologies. For frac flowback water treatment, feedwater is first dosed with flocculants to coagulate/flocculate the suspended solids and organic matters. The wastewater is then passed through an inclined plant mechanical separator to remove formed flocs. The effluent from the separator is pumped to the Aqua-Pure MVR evaporator unit to remove dissolved solids (Figure 31). A compressor is used to add the energy required to boil water. The feed water passes through two preheat exchangers where heat is absorbed from the distillate and concentrate products leaving the system. The feed then passes into a recirculation loop where concentrate circulates through an evaporator exchanger and a vapor / liquid separator. A portion of the concentrate is boiled to steam in the evaporator exchanger and separated from the liquid in the separator vessel. The manufacturer claims that the MVR evaporation can recycle up to 85% of frac flowback water into distilled water. With a lower contamination level in the feed water, the system could achieve a 90% to 95% recovery of distilled water [131]. The treated water is stored in tanks for future reuse. The system is skid mounted. The footprint of the MVR system NOMAD 2000 is similar to that of a traditional MVR evaporator—about 2,500 square feet for a daily output of 84 kgal (2,000 barrels) of distilled water and 21 kgal (500 barrels) of concentrated brine. The system consists of three modules, each 11.5 feet wide and 12.5 feet high [131]: • A pre-treatment module 40 feet long, weighing 25,000 pounds. • An evaporator module 37 feet long, weighing 42,000 pounds. • A compressor module 30 feet long, weighing 96,000 pounds. The system also includes interconnecting pipes and electrical connections, and a 50-kW generator. It needs no external source of electric power. It draws natural gas directly from the well to run the compressor and to drive the generator, which produces electricity to power the pumps, instruments, and controls. Figure 32 shows a close view of the Aqua-Pure unit operating by Devon Energy Corporation near Decatur, Texas. A summary of the technical assessment of Aqua-Pure MVR Evaporation process based on the information provided in the manufacturer’s website is listed in Table 35. 92PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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