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Salt recovery |
During the reactive dyeing of cotton, salts such as sodium chloride ( NaCL) are placed in a dyebath to aid the exhaustion of various dyes onto the fabric while bases are added to raise the pH from around neutral to pH 11 to achieve fixation. Afterwards, the used dyebath solution, calle dye bath, is discharged with almost all the salts and bases added as well as unfixed dyes. Consequently, many raw materials are lost in the waste stream ending up in the environment as pollutants. When the other Polluting Components are treated with different treatment techniques mentioned in this brouchure, the salt remains same in the Effluent resulting in high TDS. The NaCl salt solution can be recovered for Re-use in Dyeing by using nanofiltration membrane system. |
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