Chemicals manufacturer points the way to textile dyeing without effluent
10/02/2017
The market for reverse osmosis membrane elements is currently projected to grow at an above-average rate of 10% annually in the coming three years. In the case of ion exchange resins, future growth is predicted to average 4% per year, Lanxess has said.
“Water treatment is a significant global challenge and at the same time an attractive growth market,” said Jean-Marc Vesselle, head of the Lanxess’s liquid purification technologies (LPT) business unit, in the run-up to this year’s World Water Day (March 22). “With cross-technology innovation and continuous investment we shall continue to meet customer requirements and our responsibility in the future.”
The process Lanxess recommends begins with biological treatment, the separation of sludge and coarse filtration to remove the majority of organic constituents and dispersed particles such as fibres. Subsequently, the colour is removed from the filtrate by adsorption, with the help of ion exchange resins, and then softened.
In the next step, through reverse osmosis, a colourless, low-salt permeate is formed, which contains less than 1% of the originally dissolved salts and no organic contaminants whatsoever. It can frequently be returned directly to the industrial process, the company has said.
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