The typical wastewater discharged from the assembly workshop is oily wastewater, mainly a mixture of lubrication and cooling process media, detergents and disinfectants, as well as leaks from lubrication systems and equipment. Generally speaking, the sewage discharged from the machining industry accounts for 40-60% of the total discharge. Therefore, it is necessary to first deal with the lubricating and cooling process medium.

In the existing oily wastewater in the machining industry, the lubricating oil cooling process medium is opaque, semi transparent, and comprehensive. The common type is the former, which accounts for 3-11% of the wastewater as an opaque oil-water mixture. It exists in the form of additives, such as emulsifiers stabilizers, corrosion inhibitors and antioxidants, alloy additives, fungicides, etc. Under mechanical processing conditions, when the lubrication cooling process medium is used multiple times, its process performance will be lost due to the following reasons. The accumulation of metal particles and the thermal decomposition products of oil result in the oxidation of the medium during lubrication and cooling during operation. Due to emulsification, metal shavings are carried away to form colloids, causing them to deplete. During the lubrication and cooling process, the medium, lubricating oil, and special liquids rebound from the machine tool and rolling mill, increasing the liquid salt content in the aqueous phase and increasing the proliferation and pollution of microorganisms. In order to extend the service life of the medium during lubrication and cooling, it is necessary to regularly remove solid and colloidal mixtures. When the lubricating cooling process medium cannot continue to be used, it should be replaced.

The treatment methods for oily wastewater in the mechanical processing industry include flocculation, oxidation, incineration, vaporization, condensation, membrane filtration, biochemical methods, etc. Wastewater containing waste lubricating oil and cooling oil enters the receiving container. After several hours of detention, the floating oil flows into the container, and the precipitated oil residue enters the recovery tank. The lotion is pumped into the mixer, where the waste oil is treated with sulfuric acid. Sulfuric acid is pumped from the sulfuric acid storage tank into the mixer to meet the required pH value. The organic phase separated by the oil separator is introduced into the recovery device, and the partially purified turbid liquid enters the reactor. The reactor adopts flocculation method to treat lubricating oil and cooling oil wastewater, and the oil container is used for chemical composition, mixed under the action of air injection. Then deposit the solution. Organic matter enters the sedimentation tank, the aqueous phase is neutralized with lime milk, and then prepared in a container. The treated wastewater is analyzed through experiments.

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