DEVELOPMENT AND OPERATION OF A FULL-SCALE OILY WASTEWATER TREATMENT SYSTEM
Abstract:A West Virginia company that produces an oily wastewater upgraded their wastewater treatment facilities to prevent ground and surface water contamination. Applying pilot-scale data collected over a 2.5 year period, the following treatment train was proposed: settling pond → tubular ultrafiltration (UF) → holding pond → hybrid wetlands. Residual produced by the UF was to be concentrated using a high-shear rotary ultrafiltration (HSRUF) system. Full-scale operation differed significantly from pilot-scale testing resulting in several major changes in the treatment train. UF permeate produced during full-scale operation (<10 mg/L O/G) was of much higher quality than that observed during the pilot-scale studies (<50 mg/L O/G) which allowed for direct discharge of the effluent thus, the hybrid wetlands were not constructed. A large amount of free-oil (98-99% oil) formed daily in the UF feed tanks, keeping the UF feed tank oil content to less than about 20% and increasing the run lengths significantly. Because the amount of UF residual was much lower than that observed in the pilot-scale system, the HSRUF system was not required. The following modified full-scale treatment train was developed: settling ponds → tubular ultrafiltration → holding pond → discharge. Key Words: Ultrafiltration, oily wastewater, full-scale operation, water quality, oil production.
Document Type: Research Article
Publication date: January 1, 2000
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