| 摘要 |
A method is provided in which a large volume of water used with chemicals and including waste produced during this use can be easily treated while also holding down costs. This produced water treatment method, in which the produced water is extracted from the production of oil or natural gas and contains at least an oily component that has to be treated, includes: an oil separating process (1) for removing free oil from the produced water if necessary; an aggregating process (2) for aggregating emulsified oil introduced to the produced water in order to obtain micronanobubbles of ozone-containing gas in a gas-liquid contact time of preferably 2 to 60 minutes, and a floatation process (3) for allowing the aggregated emulsified oil to float to the surface as scum and to obtain purified water. |
