Water ozonation method
AssigneeLinde Aktiengesellschaft
InventorsRonald J. Grader, Richard P. Johansen
Life of this patent
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Abstract
A method for ozonation of a water stream by providing at least 70% by volume oxygen feed gas, generating 4-8% by wt. ozone in such gas by silent electric discharge with low power per unit ozone, contacting with water to dissolve ozone, and atmospherically venting ozone-depleted gas from the contacting.
Claims5
In a method for ozonation of a water stream by separating air to produce oxygen-enriched feed gas, generating ozone in said feed gas by silent electric discharge to provide ozone-containing feed gas, contacting said water stream and said ozone-containing feed gas to dissolve ozone and oxygen in said water stream, atmospherically venting ozone-depleted gas from said contacting, and discharging the ozonized and oxygenated water from said contacting;
- the improvement comprising:
- (a) producing at least 70% oxygen by volume as said oxygen-enriched feed gas;
- (b) generating between 4% and 8% by weight ozone in said silent electric discharge such that the figure of merit .eta., representing the ozone generation energy demand in kwh/lb-O.sub.3, is less than that defined by the equation:
- .eta.=1/(0.34-0.033x)
- wherein x is the ozone weight % concentration in the so-generated ozone-containing feed gas;
- and
- (c) performing said contacting of said water stream and said ozone-containing feed gas to dissolve between 0.5 ppm and 8 ppm ozone in said water stream.
In a method of contacting a water stream with ozone for purification thereof wherein air is separated to produce an oxygen-enriched feed gas, ozone then being generated in said feed gas by silent electric discharge to provide ozone-containing feed gas, contacting the water stream with the ozone-containing feed gas to dissolve ozone and oxygen in the water stream, atmospherically venting the ozone depleted gas from the contacting step, and discharging the ozonized water;
- the improvement comprising:
- (a) producing at least 70% oxygen by volume as said oxygen-enriched feed gas from the air separating step;
- (b) generating between 4% and 8% by weight of ozone in said silent electric discharge such that the figure of merit .eta., respesenting the ozone generation energy demand in Kwh/lb-O.sub.3 is less than that defined by the equation:
- .eta.=1/(0.44-0.35X) wherein x is the ozone weight % concentration in the so-generated ozone-containing feed gas;
- and
- (c) contacting said water stream and said ozone-containing feed gas in a manner such as to dissolve between 0.5 ppm and 8 ppm ozone in said water stream.
Dependencies are inferred from the claim text.