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Energy (Cost) Savings by Zero Discharge in Cooling Towers
Abstract
Maximum reuse of cooling tower blowdown by the incorporation of a sidestream softening system to recycle water can allow for significant savings in energy costs for industry. The system design parameters described in this paper are based upon calcium sulfate, calcium carbonate, and silica solubility equations for the resultant high ionic strength of a zero blowdown system. Operational aspects are highlighted in terms of deposition, corrosion, and biofouling potentials as well as currently-practiced, successful treatment procedures. The effects and history of corrosion and scale inhibitors, as well as other treatment chemicals, have been evaluated for numerous plants utilizing zero blowdown, and a summation of this knowledge is presented here. The cost analysis of conventional systems versus recycle systems is based upon a computer model's predictions for makeup waters of various qualities and costs.
Subject
Cooling TowersBlowdown Reuse
Zero Blowdown Systems
Corrosion and Scale
Treatment Chemicals
Cost Analysis
Collections
Citation
Matson, J. V.; Gardiner, W. M.; Harris, T. G.; Puckorius, P. R. (1982). Energy (Cost) Savings by Zero Discharge in Cooling Towers. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /94302.