Method of treating discharged sewage of circulating water plant through precoated membrane filtration technology

Abstract

The invention discloses a method of treating discharged sewage of a circulating water plant through a precoated membrane filtration technology. The method comprises the specific processes that (1) anagent-adding coagulation air floatation unit pretreats wastewater; and (2) a precoated membrane filtration unit performs deep treatment on air floatation produced water, wherein the precoated membranefiltration unit adopts the operation process of "backwashing membrane explosion-membrane coating-filtration", a 316L stainless steel powder sinteredporous inert membrane tube is adopted as a membranebase, and dead end filtration is performed. According to the method, the treatment effect of the discharged sewage, which contains oil and high-viscosity sludge, of the circulating water plant of a petrochemical enterprise is good, the oil content and suspended matter content in effluent are greatly lowered, and the treated sewage can be reused as circulating water or enter a conventional biochemical treatment system for treatment.

Description

technical field [0001] The invention relates to a treatment method for sewage with high pollution load discharged from a circulating water plant, in particular to a method for treating sewage discharged from a circulating water plant by pre-coating membrane filtration technology. Background technique [0002] Circulating cooling water is a large industrial water user, especially in the domestic petroleum and petrochemical industry. Due to the many processes involved, there are inevitably problems such as leakage, which makes the circulating water seriously polluted. It is difficult to achieve stable operation of the system through a small amount of supplementation. There are often large The phenomenon of exhaustion and supplementation. At present, the circulating water system mainly solves the problems of corrosion, scaling and microbial reproduction caused by continuous evaporation and concentration of water in the system by regularly adding corrosion and scale inhibitors, ...

AI Technical Summary

Problems solved by technology

[0002] Circulating cooling water is a large industrial water user, especially in the domestic petroleum and petrochemical industry. Due to the many processes involved, there are inevitably problems such as leakage, which makes the circulating water seriously polluted. It is difficult to achieve stable operation of the system through a small amount of supplementation. There are often large Phenomenon of exhaustion

At present, the circulating water system mainly solves the problems of corrosion, scaling and microbial reproduction caused by continuous evaporation and concentration of water in the system by regularly adding corrosion and scale inhibitors, bactericides, cleaning agents, etc. Processes such as mud stripping and cleaning can achieve stable operation of the circulating water system, prolong the service life of circulating water, and also increase the difficulty of treating part of the discharged sewage. The side filter backwash water and slime stripping and cleaning sewage water contain a large amount of sludge, etc. impurities, and a large amount of defoamers, bactericides, cleaning agents and other organic substances are added in the process of producing sewage, and these organic substances generally have an inhibitory effect on microorganisms, so a large amount of sewage enters the sewage treatment system in the plant in a short period of time. Each sewage treatment facility produces a strong impact load, which even leads to the death of microorganisms in the anaerobic pool and the aerobic pool. Therefore, this kind of sewage needs to undergo some pretreatment measures to make the sewage treatment plant easy to receive and treat, or it can be directly discharged to the municipal government after the treatment reaches the standard. Sewage treatment pipe network

[0003] The external drainage produced by the circulating water system has the characteristics of large water volume, high pollution load, and many interfering impurities. Conventional air flotation, coagulation sedimentation, and filtration methods are difficult to adapt to the treatment of such high-concentration sewage

[0004] Therefore, the present invention provides a method of pre-coating membrane filtration technology for treating sewage discharged from circulating water plants, so as to solve the problems of large water volume, high pollution load, and many interfering impurities in the external drainage of circulating water

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