Project Details

Project Name: Treatability of Antimony in Textile Wastewater
Country: USA
Description: Conducted treatability testing of effluent from a textile dyeing and finishing facility to recommend treatment alternatives for antimony reduction. The antimony in this effluent comes from catalysts used in the production of fibers used at the facility. Antimony levels range from 200-400 µg/L and the facility has an effluent limit of 180 µg/L. Treatability testing included examination of inorganic coagulants (FeCl3, FeSO4, alum, sulfide, hydroxide), organic coagulants (polyamines, organic aluminum salts), multifunctional ion-exchange resins, microfiltration, and ultrafiltration. Ultrafiltration resulted in some reduction of antimony levels while microfiltration did not. The ion-exchange resin also was able to reduce the antimony level, but was not pursued due to cost considerations. None of the inorganic or organic coagulants were useful except for FeCl3 which reduced the antimony levels to <20 µg/L at a dosage of 400 mg/L. This dosage also removed all visible solids from the sample and reduced the ADMI color of the sample to less than 30 ADMI units. Further testing was conducted to determine the levels of sludge produced in the system and to determine if the sludge would be regulated as a RCRA hazardous waste.

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