Effluent Treatment
Raising recovery makes less brine and worse brine. The evaporator, not the membrane, is where that trade is settled.
— m³/h
Concentrate the ZLD stage has to deal with
A negative net cost means the evaporator is spending more on energy than the recovered water is worth — which is often true, and is why ZLD is usually a discharge-compliance decision rather than a savings one. Watch the concentration factor against the saturation limits of the actual salts present; sulphate and silica scale long before sodium chloride does.
Dyehouse RO Recovery & Brine Reject Modeler (ZLD) — free, with the formula and a worked example, at Textile School.