Introduction: Gutter oil is a general term for waste animal fats, swill oil, waste oil that has been repeatedly heated and used and collected from the sewers of catering companies. It is generally divided into three categories: one is raw materials from sewers One type of gushui oil is made from frying oil that has been used many times, and the other type is made from waste animal fat.

Gutter oil is a general term for waste animal fats, swill oil, waste oil that has been repeatedly heated and used, and garbage oil collected from the sewers of catering companies. It is generally divided into three categories: one is gutter oil whose raw materials come from sewers. Oil, one type is made from frying oil that has been used many times, and the other type is made from waste animal fat. The total annual consumption of animal and vegetable oils by Chinese people is about 22.5 million tons, and the annual production of gutter oil is 3 to 5 million tons. The amount of gutter oil returned to the dining table is estimated to be about 2 to 3 million tons. I personally think it should not be that high. If According to this figure, 10% of the oil we eat is gutter oil, and the proportion in restaurants is even higher. The main hazards of gutter oil are: containing aflatoxin and polycyclic aromatic hydrocarbons; excessive heavy metal ions; and excessive cholesterol. There are so many harmful substances in gutter oil, so testing should not be a problem. Relevant departments can eliminate gutter oil by strengthening testing, just like now milk powder can eliminate melamine by strengthening testing. In fact, these indicators are very useful for detecting gutter oil from small workshops, but not for gutter oil from regular factories. There are two reasons. First, the purification of gutter oil from regular factories is the same as that of regular vegetable oil, or even better. The extraction of regular vegetable oil requires one more step to remove the aggregation of polycyclic aromatic hydrocarbons; secondly, the sales of gutter oil do not directly sell pure products to consumers, but blend different vegetable oils with gutter oil. For example, gutter oil with excessive acidity Use ground oil with very low acidity to blend so that each indicator meets or is close to national standards.

In summary, it is not difficult to understand that the detection of gutter oil has become a global problem. Gutter oil is now mainly tested from five aspects: polycyclic aromatic hydrocarbons; cholesterol; conductivity (detection of metals) ions exceeding the standard); specific genetic composition (detecting whether there are animal genes in vegetable oil, I participated in this project and am still doing it); acid value (a sign of the free fatty acid content in fat). But in fact, I think this detection has very Chinese characteristics. There is little research on detection methods abroad, because in foreign countries, the prevention of waste oil from flowing into the dining table depends not on detection, but on policies and regulations. The recycling of waste oil is a very good thing for the environment. It also has market value and can be used as biodiesel, production chemicals, organic fertilizers, etc.

Businessmen pursue profits, and it is unrealistic for you to expect every businessman to maintain a noble character. I personally think that to prevent gutter oil from flowing into the dining table, it is not about how to punish businessmen, but how to guide and manage while helping businessmen. The government has an unshirkable responsibility in this, rather than just asking the society to provide detection methods. I think that the standardized management of gutter oil should achieve the following points: Method 1: Restaurants and household sewers are forced to install devices specifically for recycling waste oil. Restaurant waste oil is recycled by specific manufacturers or professional environmental protection companies. Restaurants have no access to gutter oil at all. Households are designated for recycling by specific manufacturers or professional environmental protection companies. The government has enacted a gutter oil law, prohibiting the sale of gutter oil and frying oil (especially foreign brands McDonald's and KFC, which are heavily used for frying), and tracking and supervising them to prevent small workshops from purifying gutter oil at low cost. The sales of gutter oil are subsidized by policies. Price leverage and severe penalties are used to guide the flow of gutter oil. Subsidies are provided based on the quantity of gutter oil sold by manufacturers. Method 2: Basically the same as Method 1, the government directly recycles it at a high price and sells it to waste oil manufacturers at a low price. My method actually refers to foreign methods. While we are vigorously inventing detection methods, we should also learn from foreign countries. The country currently does not have such a policy, but some local departments have begun to adopt similar measures. I feel that the operability is not strong, and the recycling of waste oil is not thorough enough. If I follow my method, we will no longer see the dirty waste everywhere. Wen’s swill trucks have been replaced by professional equipment. We no longer have to worry about unscrupulous manufacturers selling gutter oil to edible oil companies, because they will lose government subsidies (the gain is not worth the loss) and face high fines or lose all their money. situation.

(Author: The Hero Yang Guo of The Legend of the Condor Heroes)