B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
202/52
B01D 3/00 (2006.01) C02F 1/04 (2006.01) C02F 11/06 (2006.01) C02F 11/12 (2006.01) F23G 7/00 (2006.01)
Patent
CA 1091185
ABSTRACT OF THE DISCLOSURE A process and apparatus are provided herein for thermally puri- fying waste water contaminated with high and low boiling point impurities, e.g., hydrocarbons, which effectively eliminates the use of secondary chemical agents. The process comprises introducing the waste water into a stripping column so as to separate the waste water into waste vapor containing low boiling point impurities and waste water containing 2% of low boiling point impurities in the form of combustible hydrocarbons and high boiling point impurities. The waste vapor containing the low boiling point impurities are supplied to a combustion chamber operating at a tem- perature in the range of from 900 to 1200°C., thereby producing substan- tially clean combustion gases. The waste water is introduced into a forced-circulation evaporation system having first, second and third evaporation stages so as further to concentrate the waste water such that it leaves the evaporation stages as a concentrate of high boiling point impurities in a fluid condition, and waste vapors containing such low boiling point impurities in gaseous form together with steam. The waste vapors from the first stage are fed directly to a combustion chamber where combustion takes place at 900 to 1200°C., thereby substantially complete- ly oxidizing all of the organic impurities therein. The waste vapors from the second and third stages are heated to 600°C., while, substan- tially simultaneously, pressurized air at 600°C. is fed to the waste vapors. The waste vapor and air are introduced into oxidation chambers, respectively, where temperatures of 800°C. are obtained by means of spon- taneous combustion, thereby to bring about substantially complete combus- tion or oxidation of the organic, low boiling point impurities present. The heat for heating the waste vapors from the second and third stages is derived from the heat from the purified hot waste vapors of the respective oxidation chambers. The resulting steam-gas flow substantially free of organic materials comprising purified waste vapors together with resulting combustion gases is introduced into a condensation chamber to produce a condensate of substantially pure water while a portion of the steam remains uncondensed. The overall process is such that the concentrate leaving the third evaporation stage contains concentrated high boiling point impurities whereas the substantially pure water is obtained in the condensate from the second and first evaporation stages. The entire evaporation and oxidation process takes place under pressure of 3 - 20 atmospheres gauge. The stripping column is operated with the uncondensed remainder of the steam and the oxidizing gas from the evaporation system. The water vapor departing from the waste vapor oxidation after its conden- sation supplies substantially pure water practically free of organic or inorganic impurities.
280682
Hch. Bertrams Aktiengesellschaft
Marcus & Associates
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