Recycling system for water, containing brine and organic pollutants from textile dyeing, has auxiliary circuit with tangential nanofiltration unit

摘要

A novel recycling system consists of a standard treatment circuit for dirty water. The recycling system consists of a standard treatment circuit (7) for dirty water, e.g. with an evaporator (9) and a recuperator (11) for residual sludge, and has an auxiliary circuit (12) for treating heavily polluted water by nanofiltration, using a tangential filter (14) and recuperator (15) for salts and rejecting only the residue (16), which is re-injected into the standard treatment circuit. The salts (15) recuperated from the nanofiltration unit are concentrated in a compartment separate from the evaporator (9) and can be stored for use in subsequent treatments.