Accession Number : ADA247743

Title :   Sonocatalytic Wet Oxidation for Water Purification.

Descriptive Note : Final rept,

Corporate Author : TAYLOR (S R) AND ASSOCIATES BARTLESVILLE OK

Personal Author(s) : Taylor, S R ; Rouse, C M ; Hoffman, A A

PDF Url : ADA247743

Report Date : Oct 1991

Pagination or Media Count : 43

Abstract : This program was directed toward development of a suitable ultrasonic reactor design that will allow rapid oxidation of contaminant species under mild conditions thus reducing the capital cost for the equipment as well as the operating costs associated with the high temperature and pressure operations. Additionally, a novel desalination method using ultrasonic atomization to promote vaporization with subsequent condensation was tested. We proposed that this dual action reactor could dramatically reduce the overall process temperature and pressure requirements for wet oxidation. We also proposed that ultrasonic atomization could provide a highly efficient means to achieve desalination prior to wet oxidation. Initial tests showed that the cavitation zone occurs near the face of the waveguide, but not into the screen itself. There is a synergistic effect of ultrasound coupled closely with a screen to achieve excellent mixing and resultant dispersions. However, increasing the distance between the waveguide and the screen reduces the mixing and dispersion but appears to afford better cavitation. Oxidation tests showed that ultrasonic enhancement greatly improved oxidation and removal of organic contaminants under mild conditions. Increasing pressure, however, had a negative effect on ultrasonically enhanced oxidation. Although the oxygen partial pressure is increased by higher operating pressures, cavitation significantly inhibited thus reducing the overall extent of oxidation. Ultrasonic atomization can provide a very energy efficient means to vaporize water for distillation to desalinate brackish and sea waters. So long as the thermal energy required can be derived from the surroundings, energy efficiency can be very high.

Descriptors :   ATOMIZATION, CAVITATION, CONDENSATION, CONTAMINANTS, COSTS, DESALINATION, DISTILLATION, EFFICIENCY, ENERGY, HIGH TEMPERATURE, MOISTURE, OPTIMIZATION, ORGANIC MATERIALS, OXIDATION, OXYGEN, PARTIAL PRESSURE, PRESSURE, PURIFICATION, REMOVAL, REQUIREMENTS, SYNERGISM, TEST METHODS, THERMAL RADIATION, ULTRASONICS, VAPORIZATION, WATER, WATER TREATMENT

Subject Categories : Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE