Water Conservation Measures in Dyeing Equipment

Reference [10] lists the main findings of a water care project carried out between 1976 and 1981 in the Danish, Finnish, Swedish and Norwegian textile industries. The original reference is:

Asnes H., Reduction of Water Consumption in the Textile Industry, IFATTC Conference, London, 1984.

• Batch Operation [10]
  • Winch Dyeing: by dropping the dye bath and avoiding overflow rinsing, water consumption could be reduced by 25%
  ;
  • High and Low: by replacing the overflow with Pressure Jet Dyeing batchwise rinsing, water consumption can be cut by approximately 50%
  ;
  • Beam Dyeing: about 60% of water consumption may be reduced by preventing overflow during soaking and rinsing. Automatic controls proved to be quite economical with a payback period of about four months
  ;
  • Jig Dyeing: A wide range of reductions (ranging from 15% to 79%) were possible by switching form the practice of overflow to stepwise rinsing. According to the author, laboratory scale trials using the spray technique for rinsing, were also effective
  ;
  • Cheese Dyeing: a reduction of around 70% was possible following intermittent rinsing.
• Continuous Operation [10]
  • A 20%-30% saving was realized by introducing automatic water stops. Counter-current washing proved to be the most effective method. Horizontal washing equipment delivered the same performance as two vertical washing machines, using the same amount of water.