WVO process help for School Project

Hi, I am doing a project about WVO and wanted to know more about the industry and different companies process for refining the oil. The project mainly focuses on the water that is removed during the process. If anyone could spare a moment and tell their process for refining the oil, how they dispose of the water, if any, they separate from the collected oil, what methods they're suppliers, such as restaurants, use to keep things out of the waste oil before it is collected, or anything that would help with my project, would be greatly appreciated.

Thanks,
Matt

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