The textile industry uses different dyes and pigments for coloring the final fabrics manufactured. The main difference between both is essential that dyes are soluble in water and pigments are not. And therefore, tubular UF membranes are able to remove pigments in those specific streams coming from the dying processes. By doing this before they are mixed with the rest of the wastewater coming from further processing steps, the whole treatment can be greatly simplified.
As an example, we find the so-called indigo blue dye used for denim, where Berghof tubular UF removes up to 90% color and > 99% turbidity. In this approach, the Berghof tubular UF membranes are applied as a solely direct filtration treatment step. The ability to cope with high suspended solids concentration, together with the cross-flow operation that minimizes the fouling, allows operating the system with high fluxes, minimum reject, and definite stability. The permeate obtained is clear, free of pigments and turbidity. The reject stream can even be recyclable within the dying process.
The dying processes in the textile industry generate separated waste streams containing a significant amount of residual dye products. After the fine screening to remove the fibers, this stream is directed to the tubular ultrafiltration membranes. Here, a reject with a high dye concentration is produced: it can be recovered for the dying process. The permeate is free of dyes, solids and turbidity; it can be mixed with additional waste streams generated in the textile facilities and directed to the on-site treatment plant. Alternatively, it can be discharged to the public sewer in the case that the quality fulfills the local standards.
Made in a state-of-the art LEAN-production facility, with highly-trained production personnel and materials of the highest quality.
With 50 years of experience and more than 2.000 projects worldwide, Berghof Membranes is the leading manufacturer of high quality tubular membranes.
50 years of experience and more than 2.000 project references across the globe.
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