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Project Name: Research on Metal Speciation
Country: USA
Description: Water quality standards for metals in textile effluents severely restrict permit limits and result in significant capital outlays for wastewater treatment plant improvements. In some cases, textile facilities may be required to close down or relocate due to costs associated with treatment. Ironically, many dischargers with high metals concentrations do not exhibit aquatic toxicity caused by the metals present. Thus, metals present do not appear to be bioavailable or in a form toxic to aquatic life. This study was performed to demonstrate the stability and "non-bioavailability" of metals present in textile effluents. Results were used in an attempt to obtain variances in metal limits for textile NPDES permits. Ultrafiltration was found to be most appropriate for separation of non-bioavailable fractions. Aquatic toxicity testing was performed to verify results. Tests were conducted to develop an analytical methodology used for measurement and regulation of bioavailable metals in textile effluents.
 

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