Waste oil, the garbage flowing quietly in urban sewers. Some Taoist priests processed it into "cooking oil" on the table. They fished out a lot of dim, turbid and reddish paste from there every day. These foul-smelling garbage can be turned into clear "edible oil" after only one night of filtration, heating, precipitation and separation, and finally returned to people's dining tables through low-price sales.
This three-no product, called "waste oil", is still composed of triglycerides, but the toxic substances that cause disease and cancer are much more than the real edible oil.
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It is a headache for "gutter oil" to flow back to the table. The best solution is to recycle and turn waste into treasure. Professor Wang Huajun from the Department of Environmental Engineering, University of Science and Technology Beijing, and others have successfully developed a technology to comprehensively utilize "waste oil" to prepare mineral processing reagents. This technology can be used to produce fatty acids and sodium fatty acids from "waste oil" for mineral processing, with little secondary pollution.
In 2009, University of Science and Technology Beijing carried out the research on using fatty acids decomposed from "gutter oil" as mineral collectors, and achieved satisfactory experimental results.
This technology has been applied in some iron and steel enterprises and is applying for national patents. Experts believe that the further research and application of this technology will be of great significance to avoid environmental pollution, reduce the cost of mineral processing and reduce the threat to food safety.