Abstract:
Wastewater treatment unit was modified to improve heat recovery between treated wastewater and wastewater for the same quality of treated wastewater. By inserting a parallel of similar heat exchanger for preheating wastewater, the steam consumption was reduced by about 50.1 %. While, with a series of two similar heat exchangers for preheating wastewater, the steam consumption was further reduced by approximately 53.2 %. In additional, the steam consumption was further reduced by 58.4% with modification of the stripper temperature control.