Hazards of waste cooking oil Waste cooking oil contains many toxic and harmful ingredients. When people eat cooking oil mixed with waste cooking oil, they will initially suffer from dizziness, nausea, vomiting, diarrhea and other poisoning symptoms. If they eat it for a long time, it will lead to nutritional deficiency, serious internal organs damage and even cancer. Sensory identification of waste oil: look at transparency and color. The color is dark, turbid, and there is sediment. It may be gutter oil that is easy to solidify at low temperature. The first detection trick is to pour a little oil on the popsicle, and the oil will soon solidify and adhere to the popsicle, which is probably made of waste oil. The second trick is to pour a little oil on the glass. If the oil flows slowly, there may be a problem. Second smell: Each oil has its own unique smell. You can drop a drop or two of oil on your palm, rub your hands together, and smell it carefully when you are hot. It's probably the gutter oil that smells bad and smells faint. Third taste: take a drop of oil with chopsticks and taste it carefully. The oil with peculiar smell may be gutter oil, the cooking oil containing gutter oil is not fragrant, and the residual oil residue is black charcoal. Listen 4: Take one or two drops of oil from the bottom of the oil layer, smear them on flammable paper, light them and listen to their sound. If the combustion is abnormal and makes a "squeaky" sound, the water content exceeds the standard and it is an unqualified product; When burning, it makes a "crackling" explosion, indicating that the water content of the oil is seriously exceeding the standard, and it is possible to adulterate the product, so it is absolutely impossible to buy it. Five Questions: Ask the merchants about the purchase channels, ask for purchase invoices or check the sampling inspection reports of local food hygiene supervision departments if necessary. Physical and chemical inspection of waste cooking oil Re-treatment of waste cooking oil Brazil uses kitchen waste oil as raw material to refine biodiesel, which not only provides clean energy, protects the environment, but also benefits the poor people with the funds obtained. The government gave strong support, decided to set up factories, equipment and loans, and carried out the project of refining biodiesel from kitchen waste oil in the form of cooperative operation; Bazhong Federation, a Chinese association, employs chemical engineers to provide technology; Chinese communities and people in some slums are responsible for collecting raw oil. At present, 7% of the biodiesel produced is given to the government free of charge for city buses, and the other 3% is sold to Petrobras and sold at gas stations. In addition to the salary of the factory staff, the profits are deposited in the bank for public welfare in poor communities. It can be said that the biodiesel they produced increased the supply of clean fuel, strongly supported the public transportation in Campinas, and correspondingly reduced the exhaust emissions and purified the air quality. At the same time, the profits are used for public welfare undertakings in poor communities, such as building kindergartens, which can be said to be a cause that benefits the country and the people. Come and express your opinion!