Recovery of spent CIP Solutions

The discharge of effluent to the sewer or for on-site treatment has become increasingly expensive. Most industries have already reduced their water consumption to a minimum. However, efficient cleaning often produces a large volume of caustic effluent, even with CIP systems that re-use the detergent a number of times. 
However  it is now possible to recover more than 90% of a spent caustic solution by using pH resistant nano filtration membranes. This gives reduced operating costs and better performance that the traditional centrifugal separator method.
Membrane filtration was introduced to the food industry more than 30 years ago. Sterile filtration, protein concentration, desalination and dewatering are typical membrane processes which individually or in combination find their uses in the manufacture of liquid foods. 
A membrane is often characterised by its pore size and Molecular Weight Cut Off (MWCO). Membrane materials are generally either ceramic or polymeric materials. Ceramic membranes are only available in the ultra filtration / micro filtration range, whereas polymeric membrane MWCOs cover the entire filtration range.

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