Reduced Energy Consumption Evaporator for Use in Desalting Impaired Waters

摘要

The basic objective of this program is to demonstrate significant savings inenergy consumption by the use of the wiped film rotating disk (WFRD) evaporator in a five-effect vapor compression distillation (MEVCD) system to recover the maximum amount of water from agricultural drainage water and other impaired waters. Tests were conducted using a 10,000 ppm aqueous solution of sodium sulfate and sodium chloride to simulate the composition of agricultural drainage water in the San Joaquin Valley, California. The feed was concentrated by a factor ranging from 15 to 20 resulting in a blowdown salinity of 150,000 to 200,000 ppm. The results showed the presence of dissolved salts has significant influence on energy consumption by the compressor of a commercial 60,000 gal/day VCD unit tested at Los Banos, California.