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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition GeoPure Water Technologies, LLC The GeoPure desalination process is a combination of pre-treatment, UF, and RO. These three treatment steps are operated in series to treat a wide range of produced water compositions and produce clean water that may then be discharged or reused. This technology was specifically developed for the desalination of oil and gas produced waters. Pilot scale systems have been tested in Texas A&M laboratories and at 12 field locations throughout Texas. The manufacturer [161] claims to have purified produced waters containing up to 50,000 mg/L TDS, but does not cite any specific studies. Depending on raw water quality, this process employs various pretreatment processes to remove dispersed oil, suspended solids, or dissolved hydrocarbons. The pretreated water is then further purified with polymeric UF and RO. The UF system provides a final barrier to suspended solids (such as colloids) prior to the RO subsystem. GeoPure Water Technologies, LLC performed a field test of its commercial desalination unit in the Barnett Shale Play of central Texas in 2006 [162, 163]. In this field trial, frac flowback water was treated at a feed rate of 210,000 gpd (5,000 bpd). The feed water from this field trial also contained 4,200 mg/L TSS, 170 mg/L Fe, and 940 mg/L Ba. After coagulation/flocculation, the water was treated with GeoPure’s UF and RO units. Influent and RO permeate TDS concentrations were 15,000 and 190 mg/L, respectively, corresponding to 98.7% TDS rejection. When including the coagulation/flocculation pretreatment process, total treatment costs were estimated to average $0.94 per barrel. A second field trial was conducted at a CBM well field in Western Wyoming [162, 164]. The GeoPure treatment process was tested with CBM produced water containing corrosion inhibitor, alcohols, and surfactants. Other feed water parameters include a feed TDS of 9,700 mg/L (dominated by NaCl) and 41 mg/L of dissolved hydrocarbons. 99% rejection of TDS was achieved. No electrical or other cost information was provided from this study. GeoPure focuses on optimizing pretreatment technologies to protect its core UF/RO treatment processes from membrane foulants (especially dispersed oils). A technical assessment of the GeoPure treatment process is summarized in Table 48. Table 48. Summary of technical assessment for GeoPure Water Technologies, LLC. Criteria Industrial status Product water quality Production efficiency (recovery) Description/Rationale Oil and natural gas related field trials have reportedly been conducted at 12 sites. Two summary documents from field trial experiences with frac flowback water in Texas and CBM produced water in Wyoming were located. 98-99% rejection of TDS was reported in available field-testing reports. Product water recovery in one field test was reported to be 50%. 60-70% recovery is estimated for feed water of 7,000 and 17,000 ppm chlorides, respectively. Feed water quality bins The vendor reports treating water in excess of 50,000 mg/L TDS. Available field trial reports report treating water with TDS ranging from 9,700 to 15,000 mg/L. Frac flowback water constituted high concentrations of barium, dissolved hydrocarbons, and iron. 128PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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