Forward osmosis for dye wastewater

The Two-Way Osmosis (TWO) system from Catalyx uses a special membrane to employ a forward osmosis concept combined with the more common reverse osmosis concept to clean the wastewater.

Carpet and textile dyeing mills use copious amonts of water in their dyeing operations, and in many areas, the shortage of fresh water is hampering operations, Catalyx says. Conventional nanofiltration and/or reverse osmosis membrane equipment requires very high levels of chemical pre-treatment of the wastewater to remove the synthetic and natural oils which foul membranes, creating a chemical-laden concentrated waste stream after the water is removed. The Catalyx TWO system can treat the water streams without chemicals, enabling the concentrated wastewater that is rich in organics to be incinerated in a boiler or anaerobically digested to produce biogas.