Brine/Salt Recovery System
Salt for the dyeing process is a major expense in the textile industry, especially for natural fabrics such as cotton. Besides the economic aspect, environmental issues linked to excessively salty water discharges make water and salt reuse an important issue for all the dyeing companies. Direct salt recovery from the dye bath offers the advantage of treating less water quantity as compared to the water amount coming from the whole dyeing process. Moreover, the dye bath does not contain a significant concentration of hardness and therefore salt can be recovered without residual hardness. The dye bath is usually around 10% of the total flow, therefore, if a total water discharge generated by dye bath and washings is equal to 1000 m3/day, the dye bath would be just about 100m3/day. Also, being a physical process, it requires only a limited area for installation. Moreover, when our system is paired with a biological wastewater treatment plant, the outlet water may be prepared for recovery or used for toilets and floor washing, whereas the flow discharged to rivers or lakes shows an excellent quality and very high dissolved oxygen values, meaning that it can even improve the water quality of the receiving water body. If water recovery for process use is required, then after the biological treatment membrane units are installed in order to generate high purity water which can be used in the dyeing process or for other equipment such as boilers.
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