Method and system for pretreatment of flushing sewage

Abstract

The invention relates to a pretreatment method and a system for flushing sewage. The system includes: a collecting tank, which receives the flushing sewage of a flushed unit through a connecting pipeline; a recycling bin, which is internally provided with an oil skimmer at the top, is in connection with an oil collection groove through a pipeline, and is equipped with a steam coil at the bottom; an acidifying agent adding tank, which is connected to the recycling bin through a pipeline so as to add an acidifying agent to the recycling bin; a settling bin, which is adjacent to the recycling bin and communicated with the recycling bin at the upper part, and is internally provided with a blender and electrode plates; a mud pump, which is in connection with the bottoms of the recycling bin and the settling bin through pipelines; and a filter press, which is respectively connected to the mud pump and a sewage pit through pipelines. The method is implemented through the system, and consists of the steps of: sewage collection, sewage heating, acidification demulsification, oil skimming, waste oil recycling, electric flocculation, blending, settling, filter pressing and discharge. The method and the system provided by the invention can remove oil sludge and iron soap from the flushing sewage, so that the flushing sewage can be normally discharged to a next process to undergo treatment.

Description

technical field [0001] The invention relates to sewage treatment technology in metallurgical machinery, in particular to a pretreatment method and system for decontamination and flushing water of metallurgical machinery. Background technique [0002] In the production site of the metallurgical industry, a large amount of industrial water is used for decontamination and washing of various mechanical unit equipment during production or maintenance. For example, in the process of dismantling and overhauling large mechanical units such as compressors, in order to remove oil, dust, iron filings and other impurities on the surface or inside of the equipment, industrial water is used for decontamination and washing, and the resulting washing sewage is collected and discharged into sewage system or connected to the cooling water return system, and then recycled after subsequent treatment. For another example, in steel rolling production, after the peeled iron powder or iron filings...

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Problems solved by technology

However, the patent application for this invention is mainly concerned with the treatment of emulsion oily sewage, and its waste liquid does not contain oil sludge. Its technical solution is aimed at how to recycle the waste emulsion to meet the discharge requirements, and it cannot solve the problem of mechanical units. The problem of oil sludge in equipment flushing water clogging pipes

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