Suitable use: after purification, it can be used as chemical raw materials and animal feed; You can also make soap.
But most of them can still be recycled, and some of them have been dumped. If the dumped gutter oil is fished out from the sewer, it is called gutter oil. This kind of oil recovery is actually a good thing, because too much waste oil will be blocked in the gutter, which is not good for the environment. This is also a kind of waste utilization.