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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition According to the technical information provided in the website of Intevras Technologies, the advantages of the EVRAS system include: Use of low temperature waste heat TDS insensitive Corrosion resistant and minimal scaling problems Simplicity in operation and minimal maintenance: operating at atmospheric pressure No blow-down or discharge The EVRAS process is an evaporative system and no fresh water is recovered from produced water. The EVRAS fits with compression stations to use the waste heat. Without waste heat available onsite, the process is energy intensive and may not be feasible for CBM produced water treatment. The EVRAS system does not have multiple effects; therefore, the energy consumption is intense. Also, the vendor claim that the EVRAS system is suitable to treat large volume of waste streams and it may not be feasible to treat point source of CBM produced water with varying flow rates. The assessment summarized in Table 38 is based on the information provided in the website of Intevras Technologies, LLC (www.intevras.com). Figure 36. Picture of an EVRAS system to evaporate a portion of produced water from natural gas drilling in Barnett Shale [140]. Table 38. Summary of technical assessment of the EVRAS evaporative system. Criteria Feed water quality bins Product water quality Description/Rationale The technology is not sensitive to the level and type of brine. The process has been employed with saturated feed waters at TDS level of 310,000 mg/L [141]. No product water. Industrial status Proven technology in various industries. For example, the technology has been employed in California for waste disposal of brines generated with the production of oil and gas. It is also being tested for reducing the produced water volume during natural gas drilling in the Barnett Shale (field testing, capacity unknown). Intevras Technologies, LLC, owns the patent of the technology. 102PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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