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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition regeneration brine can be blended with the product water streams (low and high pressure RO and evaporation) before discharge. The CDM process has been pilot tested with CBM produced water feed from the Powder River Basin and with tight sands gas produced water from the Piceance Basin. The CBM produced water contained emulsified oil and grease, particulates, and silt. Sodium bicarbonate was the dominant salt. The tight sands gas produced water contained 438 mg/L oil and grease, and 119 mg/L silica. No operational data was available for either test site. The following cost estimates were presented based on the pilot testing experience in the Powder River Basin: $0.14/bbl or $3.33/1000 gal (not including energy or brine disposal), $0.08/bbl or $1.90/1000 gal for brine disposal. Cost estimates were not provided for the pilot test on tight sands produced water. The following water quality issues affecting pretreatment were identified: silt, suspended solids, oil coated particles, and coal fines. Water quality issues affecting the RO processes include: calcium harness, iron, barium, silica, and microbial fouling. CDM found that for CBM produced water, sodium bicarbonate solubility is the limiting factor for further increasing the system recovery. In order to accommodate changing water volumes, modular systems can be designed to treat volumes from 5,000 bbl/day (200,000 gpd or 145.8 gpm) to 20,000 bbl/day (840,000 gpd or 583 gpm) with additional units added or removed, as necessary. A technical assessment of the CDM process is summarized in Table 43. Figure 43. CDM produced water treatment technology: process diagram. (http://ipec.utulsa.edu/Conf2008/Manuscripts%20&%20presentations%20received/Kimball_24.pdf). 117PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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