| http://www.w3.org/ns/prov#value | - However, there is a problem in trying to dissolve ozone in the water to purify it and yet not discharge a significant portion of unreacted ozone from the water, thus wasting it and potentially creating a health hazard. [0003] Four types of gas-liquid contactors have been used for this purpose including spray towers, where liquid is dispersed in a gas, packed beds, bubble plates or sieve towers, an
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