Recycling system and recycling method for die-casting waste liquid

Abstract

The invention discloses a recycling system and a recycling method for die-casting waste liquid. The recycling system is provided with a box body, wherein a vacuum filtering system, a waste liquid centralizing pool, a control box, a scraper system, a sterilizing system, a centrifugal filtering system, a net bag filtering system, an electric flocculation system, a bag type filter and a membrane filter are arranged in the box body. The recycling system has the advantages that the processes of suction, filtering, centrifuging (customizing), sterilizing, electric flocculation, gas mixing, recovering of calcium and magnetism ions, bag type filter and membrane filtering are cooperated to use, so the energy-saving and environment-protection effects are realized, and the wealth is created; by using a PLC (programmable logic controller) to control, the high-efficiency operation of equipment is realized, the hourly treatment amount is more than fifty-thousand tons, and the land occupation area is 40 square meters; compared with building of sewage treatment plants, the time, labor and land are saved, the convenience is realized, the physical type is used for treating, the environment-friendly and recycling effects are realized, and the efficiency is high; the treated wastewater can reach the standard of reused water, the equipment is recycled, the energy-saving and emission-reduction effects for oil-containing wastewater are realized, the wastewater is utilized, the resources are protected, and the secondary pollution is prevented.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment and recycling, in particular to a die-casting waste liquid recycling system and usage method. Background technique [0002] Oily water comes from a wide range of sources, mainly from petroleum extraction and processing, petrochemical industry, metallurgy, machinery industry, textile, food processing industry and marine transportation industry, etc. The main components include: light hydrocarbons, heavy hydrocarbons, fuel oil, tar , lubricating oil, fatty oil, wax grease, soap, etc. Numerous sources of oily wastewater lead to a very diverse variety and nature of wastewater. The seriousness of the environmental pollution caused by oily wastewater has attracted people's attention. In this case, various processing techniques associated therewith have also been developed. Early physical and chemical treatment effects were not significant. Until recent years, conventional phy...

AI Technical Summary

Problems solved by technology

Traditional treatment methods (chemical demulsification method, air flotation method, various gravity separation methods, etc.) not only cannot effectively remove oil, but also produce a large amount of secondary pollution such as waste oil sludge that is difficult to handle, and cannot meet the sewage discharge standard

It also has the disadvantages of lengthy processing process, high processing cost, and large floor space.

There is a bottleneck in the treatment of high-concentration mechanical processing wastewater in China. Many combined treatment processes can successfully reduce its COD to thousands of mg / L, but it is very difficult to further improve the treatment efficiency.

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