After you have finished frying, the next thing to think about is how to dispose of any cooking oil left behind. You should find a way to dispose of the oil you used, regardless if you are using vegetable oil, lard, or shortening. You can find the best waste oil reuse for the requirement of your industry.
It is not a good idea to dump it in the sink as it can cause clogs in your home's drain lines and, in turn, affect the drain lines of the entire community. Because of the potential negative effects on the environment, most municipalities and communities have laws in place that prevent homeowners from dumping oil into their drain lines. What about putting it on the ground? This is not an option, either, as it has been shown that cooking oil can cause many health problems and, in extreme cases, may be harmful to wildlife.
Step 1: Smell the oil to determine if it should be thrown out.
It doesn't mean that you should throw away cooking grease. Let's suppose you used a skillet to fry your food. You only need to scrape out any food residue from the oil. Once you are done, you can put the grease in a container to store it for future use.
You can smell the oil to determine if it is bad. Good cooking grease should look pale and have a pleasant smell. Bad cooking oil will smell bitter and have a crayon-like appearance. If your grease looks like this, it is likely that the oil has reached its end of life.
Step 2: Wait for the oil to cool enough
Before you can use cooking oil, let it cool to room temperature before you handle it or try to put it in a container. It will take at least one hour for the grease to cool down in an insulated fryer before it can be used again.