Efficient treatment method and device for iron and steel wastewater

Abstract

The invention discloses an efficient treatment method and device for iron and steel wastewater. The efficient treatment device comprises a raw water pool, a raw water pump, a membrane reaction pool, avacuum pump, a vacuum electric valve, a water-producing pump, a water-producing electric valve, a water-producing pool, a backwash pump, a precision filter, a backwash electric valve, a Roots blower,an air-intake electric valve and a maintenance cleaning system; the iron and steel wastewater is transported to the membrane reaction pool, and an ultrafiltration membrane in the reaction pool is a hollow fiber membrane made of PTFE (polytetrafluoroethylene); the complete water production cycle includes water production, gas washing, gas-water backwashing and water production; the device emptiesconcentrated liquid in the membrane pool every 6-15 hours and automatically replenishes the water into the normal filtration procedure; the maintenance chemical cleaning cycle is determined accordingto the upward trend of transmembrane pressure difference during operation; restorative chemical cleaning of the PTFE the hollow fiber membrane is required when the transmembrane pressure difference isgreater than or equal to minus 0.05Mpa. Due to the use of the PTFE hollow fiber membrane, not only the effluent quality and unit treatment water quality are improved, but also the operation cost of the iron and steel wastewater is reduced, and the effect of saving energy and increasing production is achieved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to an efficient treatment method and device for iron and steel wastewater. Background technique [0002] Iron and steel industry wastewater mainly comes from production process water, equipment and product cooling water, flue gas washing water, equipment and site cleaning water, etc. Among them, about 70% of the cooling water is various cooling water, and the waste water contains thermal pollution, SS, organic matter, chemical poisons, heavy metals, acid-base pollution, etc. [0003] The iron and steel industry is a major player in water and drainage. Therefore, strengthening the treatment and recycling of wastewater in the iron and steel industry is of great significance for protecting the environment, improving the comprehensive competitiveness of enterprises, and realizing industrial upgrading. [0004] At present, the general treatment methods of iron and steel wastewater at home...

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Problems solved by technology

[0008] At present, many iron and steel enterprises have carried out sewage reuse work, most of which adopt traditional treatment technologies, such as biochemical degradation, coagulation sedimentation, air flotation, filtration, etc., but due to the complex composition of iron and steel industry wastewater, after traditional treatment The contaminated water cannot effectively remove the pollutants and cannot meet the requirements of new water for production, but the membrane advanced treatment solves this problem

However, the hollow fiber membranes currently on the market have a series of problems such as serious broken wires, poor acid and alkali resistance, frequent cleaning, and short life, which restrict the application of membrane methods in steel wastewater.

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