It can be collected, which is generally used in industry. For example, many plastic factories in Wenzhou, Zhejiang Province can not only purify the environment, but also collect waste oil, which can also be sold for money. However, the oil in catering can also be collected, but it must not be used again. This is the same as gutter oil, which is harmful to the health. Never use it, let alone sell black-hearted businesses.