Accession Number : AD0278833

Title :   WATER RECOVERY BY REITERATIVE FREEZING

Corporate Author : HONEYWELL INC MINNEAPOLIS MINN

Personal Author(s) : BEUTEL,JACK

Report Date : MAR 1962

Pagination or Media Count : 1

Abstract : A method of recovering potable water from urine by employing the differences in solute concentration of a liquid-ice phase system as a means of purification is discussed. This method is called reiterative freezing. A parameter of the solute concentration distribution, called the effective distribution coefficient, is defined; and a number of experimental conditions for which the effective distribution coefficient is calculated are described. The effect upon the attainable separation due to rate of freezing, agitation, and direction of freezing with respect to the gravity direction is discussed. The effective distribution coefficients obtained for these experimental conditions are compared with the distribution coefficients attainable under ideal conditions. The effect of freezing upon the distribution of micro-organisms is discussed. The energy requirements for the recovery of potable water from urine by various reiterative freezing schemes are calculated as a function of the yield and of the volume of liquid that must be frozen to recover a unit volume of potable water containing less than 500 parts per million of solids. A comparison is made between these energy requirements and the energy requirements of a simple distillation process. (Author)

Descriptors :   (*WATER), (*CLOSED ECOLOGICAL SYSTEMS), FREEZING, RECOVERY, AEROSPACE MEDICINE, SPACE FLIGHT, URINE

Distribution Statement : APPROVED FOR PUBLIC RELEASE