How gutter oil is made

Gutter oil, as the name suggests, is oil and grease extracted from sewers, food waste discharged from restaurants, food processing food waste and other places. Its production process is very complicated.

1. Waste containing oil and grease needs to be collected. Most of these wastes come from the leftovers of the restaurants, the leftovers in the garbage cans, or the wastes of the food processing plants and so on. These grease-containing wastes are packed by people in containers such as plastic bags and iron drums, and then transported to places where gutter oil is produced.

2. After entering the production site, these wastes are first washed to remove impurities and non-fat parts. Next, it undergoes a heat treatment to separate the oil from the other parts. This is usually done by steaming at high temperatures, which melts out the oils and fats through heat.

3. After the oil is separated, the next step is to further refine it. This is mainly done by centrifugal separation. Centrifugal separation is a method of separating substances by utilizing the different speeds at which they settle under the action of centrifugal force. Through centrifugal separation, oil and grease and non-oil parts can be further separated.

4. After this process the preliminary refined gutter oil is derived. However, gutter oil at this stage cannot be used directly and requires further refining. This step usually includes operations such as acid and alkali treatment, decolorization and deodorization. Through these treatments, the color, smell and taste of the gutter oil will be improved so that it is closer to normal cooking oil.

Although the process of making gutter oil may seem complicated, it contains a lot of harmful substances because its source is various kinds of waste. So we must be vigilant in our daily life and avoid buying and consuming gutter oil as much as possible.