Produced water treatment dissolved gases

Up to now, ozonation of drinking water has been considered too difficult, especially in comparison with chlorination. The outlay for the relatively expensive installations and the high costs of operation were objectionable. In most cases the plants have seemed unprofitable. It appears, moreover, that all the European ozonation plants still employ water-treatment processes which do not permit proper utilization of all the ozone produced by the ozonators. Perhaps 40% of the ozone is lost because of the difficulty of dissolving the gas in the water with the available means. On the other hand, there is no doubt of the actual efficacy of the ozone water treatment in the French plants in operation. 

Water coming out along with gas and cmde oil from oil wells (known as produced water)—It can contain oily sludge and dissolved salts and hence needs considerable treatment before use ... 

Due to the large temperature gradient in many gas wells, corrosion mechanisms can change, resulting in different types of corrosion in the same well, whereas oil wells do not exhibit this behavior. Normally, oil wells produce more liquid than gas wells, resulting in a shorter treatment life when batch treated. Because corrosion in oil wells is electrochemical in nature, an electrolyte must be present for corrosion to occur. In oil wells, the source of the water is nearly always the producing formation, and the water will contain dissolved salts in concentrations ranging from traces to saturation. Water associated with corrosion may be in a thin layer, in droplets, or even the major phase. 

This method has a distinct advantage in that it produces ozone in pure water (electrolyte free), making this system more desirable for wastewater treatment. Higher dissolved ozone concentrations can be achieved by pressurizing the system [16] which will eliminate the need for low efficiency gas-liquid contact spargers. However, some of the disadvantages of this system are ... 

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