Preparation and Application of Ozone Gas in Water Treatment Using Plasma Technology

Low solubility also gives potential in the use of ozone through decreasing the intermediates of ozone reactions. In water treatment technology, ozone can be used to disinfect drinking water, wastewater, and water in the food industry. Conventional methods for ozone gas generation are direct and indirect when using electrical discharges, strong ultraviolet radiation, or radioisotope sources. The direct ozone gas generation method has the advantages of having purer gas mixtures, resulting in a higher ozone gas concentration, and decomposing easily into oxygen, but the plasma is easier to be destroyed. Ozone (O3) gas has long been known as one of the agents used in water treatment technology due to its strong oxidizing power. Ozone gas can decompose quickly, increase dissolved oxygen (DO), decompose toxic substances such as heavy metals, improve color, and reduce turbidity. Increasing the solubility of ozone will enlarge the application of ozone for wastewater treatment. The concentrations of ozone are 6 times larger in 20℃ water compared to concentrations in air. Ozone gas has lower solubility than oxygen gas.