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HYPERFILTRATION FOR RENOVATION OF COMPOSITE WASTE WATER AT EIGHT TEXTILE FINISHING PLANTS
Citation:
Brandon, C., J. Porter, AND D. Todd. HYPERFILTRATION FOR RENOVATION OF COMPOSITE WASTE WATER AT EIGHT TEXTILE FINISHING PLANTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-78/047.
Description:
The report gives results of field evaluations of hyperfiltration at eight plants as a way to renovate composite wastewaters from textile finishing plants. The evaluations included performance assessment of different types of commercially available membranes, reuse of both renovated water and waste concentrates, and the treatability of wastewater concentrates by conventional means. On-site field tests involved a mobile hyperfiltration laboratory. Both cellulose acetate and dynamic membranes, when used with the manufacturers' recommended pretreatment, proved feasible for wastewater renovation. When 90% of the feed was recovered, the renovated water was satisfactory for reuse in scouring, bleaching, dyeing, and finishing. Successful reuse of the residual concentrates, 10% of the feed, containing significant quantities of dyes and chemicals, was not generally demonstrated. However, treatability of the residual concentrate by conventional waste treatment processes produced effluent equivalent in quality to current composite plant discharges. Preliminary operating costs are projected for full-scale systems utilizing cellulose acetate membranes to treat composite wastewater. Savings may be possible from recycled process water, recovery of chemicals and dyestuffs, and use of recycled water at, or near, operating temperature (instead of lower temperature fresh water).