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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition Eco-Tec: Recoflo® compressed-bed IX process A Canadian based company, Eco-Tec Inc. has developed two compressed bed IX systems that offer lower operational footprint, faster regeneration, and increased throughput compared to conventional IX processes. The compressed bed systems are an extension of conventional packed bed IX processes. The Eco-Tec systems are differentiated by one system that has two separate compressed-bed columns for anion and cation removal, and a second system with three separate compressed-bed columns that contain a primary cation bed and anion bed followed by a polishing cation bed. The ion exchange resin employed by the Recoflo® process is composed of fine mesh resins that are reported to increase exchange kinetics [148, 149]. A photograph of the two-bed system is shown in Figure 41. Figure 41. Eco-Tec Recoflo® compressed bed IX system. Of the two cylindrical beds pictured, one is loaded with cation exchange resin and the other with anion exchange resin. Each column houses 3 to 6 inches of ion exchange resin [148]. Eco-Tec Recoflo® systems have been employed to treat copper electrolyte solutions, recover nickel salts, recover metals from process solutions, and purify alternative fuels [150]. Recently, Eco-Tec was awarded a service contract for a Marathon installation in the Powder River Basin (WY) [151]. The system is designed to treat 1.5 MGD (36,000 bpd) produced water. The Recoflo® system is designed to operate with a short duration run time of 30 minutes followed by a seven minute regeneration period. Eco-Tec claims that operating the system in this manner increases the access to most exchange sites on the resin, which increases exchange rates for both the IX and regeneration process [149]. The system requires both H2SO4 and NaOH to regenerate the cation and anion IX resins, respectively. Recoflo® compressed beds are more mobile than conventional IX processes and the Higgins Loop. A schematic of a full treatment train with two, skid-mounted three-bed systems operating in parallel is shown in Figure 42. A summary of the technical assessment for the Eco-Tec Recoflo® compressed-bed IX process is shown in Table 42. 112PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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