Many industries specially food and dairy use caustic as cleaning chemical. The waste generated adds on to ETP process and thus need to find some way to reduce this load. Caustic recovery is one way out provided the spent caustic stream generated after cleaning is separately processed. The caustic can be recovered thus reducing the load on ETP and thus can be reused for cleaning activities. Nilsan has developed a membrane based green system where in the monetory requirement is less with a versatility of scale up and customized systems with minimal maintenance cost.