Pretreatment method for reduction of strong brine in iron and steel industry

A technology for iron and steel industry and concentrated brine, which is applied in water/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc. It can solve the problem of high operating costs, no consideration of organic pollution and inorganic scaling of reverse osmosis membranes, and limited promotion. and application problems, to achieve the effect of simple equipment, stable processing effect and low energy consumption

Inactive Publication Date: 2020-06-05
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of the three-stage reverse osmosis not only has high operating costs, but also the process does not take into account the problems of organic pollution and inorganic scaling of the reverse osmosis membrane, which limits the promotion and application

Method used

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  • Pretreatment method for reduction of strong brine in iron and steel industry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] See figure 1 , The concentrated brine from the iron and steel industry first enters the regulating tank to balance the water quality and quantity. The effluent from the regulating tank enters the electrocoagulation equipment. The electrode material of the electrocoagulation equipment is aluminum-iron plate, the reaction voltage is controlled at 3V, the distance between the plates is controlled at 2cm, the reaction time is 25min, the pH of the wastewater is controlled at 7.0, and the power supply adopts periodic commutation power supply. The period is 8s. After electrocoagulation treatment, the suspended solids and calcium and magnesium metal ions in the wastewater are effectively reduced. The effluent from electrocoagulation enters the first-stage electro-adsorption equipment, the plate voltage is controlled at 1.0V, the distance between the plates is 1.5cm, and the pH of the wastewater is 7.0. In the second stage of electrosorption, the voltage of the control plate i...

Embodiment 2

[0024] See figure 1 , The concentrated brine from the iron and steel industry first enters the regulating tank to balance the water quality and quantity. The effluent from the adjustment tank enters the electrocoagulation equipment. The electrode material of the electrocoagulation equipment is aluminum-iron plate, the reaction voltage is controlled at 4V, the distance between the plates is controlled at 2.5cm, the reaction time is 30min, the pH of the wastewater is controlled at 7.5, and the power supply adopts periodic commutation power supply. To the cycle 9s. After electrocoagulation treatment, the suspended solids and calcium and magnesium metal ions in the wastewater are effectively reduced. The effluent from electrocoagulation enters the first-stage electro-adsorption equipment, the plate voltage is controlled at 1.4V, the distance between the plates is 2.0cm, the pH of the wastewater is 7.5, the concentrated water from the first-stage electro-adsorption returns to the ...

Embodiment 3

[0027] See figure 1 , The concentrated brine from the iron and steel industry first enters the regulating tank to balance the water quality and quantity. The effluent from the regulating tank enters the electrocoagulation equipment. The electrode material of the electrocoagulation equipment is aluminum-iron plate, the reaction voltage is controlled at 5V, the distance between the plates is controlled at 3cm, the reaction time is 35min, the pH of the wastewater is controlled at 8.0, and the power supply adopts periodic commutation power supply. The period is 10s. After electrocoagulation treatment, the suspended solids and calcium and magnesium metal ions in the wastewater are effectively reduced. The effluent from electrocoagulation enters the first-stage electro-adsorption equipment, the plate voltage is controlled to 1.8V, the distance between the plates is controlled to 2.5cm, the pH of the wastewater is 8.0, the concentrated water from the first-stage electro-adsorption r...

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Abstract

The invention relates to a pretreatment method for reduction of strong brine in the iron and steel industry, which comprises the following steps of: 1) feeding strong brine in an iron and steel industry into an adjusting tank to balance water quality and water quantity, then feeding effluent of the adjusting tank into electric flocculation equipment, feeding sludge discharged by the electric flocculation equipment into a sludge treatment system to be treated, feeding effluent of electric flocculation into first-stage electro-adsorption equipment, returning second-stage electro-adsorption concentrated water to a front-end regulating tank, enabling the water produced after the secondary electro-adsorption treatment to enter a sand filtering device and an ultrafiltration device, enabling concentrated water to flow back to an adjusting tank for circular treatment, enabling the water produced after ultrafiltration to enter chelating ion exchange resin, enabling regenerated wastewater of theion exchange resin to flow back to the adjusting tank for circular treatment, and enabling effluent to enter a membrane concentration unit. The method has the advantages of low energy consumption inthe technological process, low cost, simple equipment, easiness in operation and stable treatment effect, and creates a good water inlet condition for subsequent membrane concentration.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a pretreatment method for reducing the amount of concentrated brine in the iron and steel industry. Background technique [0002] The unit water consumption of my country's iron and steel enterprises is still higher than the level of foreign advanced iron and steel enterprises. Further reduce the new water consumption per ton of steel in iron and steel enterprises, improve the recycling rate of water in iron and steel enterprises, and strengthen the comprehensive treatment and reuse of wastewater in iron and steel enterprises. One of the keys to the sustainable development of enterprises. [0003] Wastewater reuse is the ultimate goal of wastewater treatment, but after wastewater is treated by reverse osmosis, while most of the primary pure water is obtained, a large proportion of high-salinity concentrated water is also produced. The products ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/16
CPCC02F1/001C02F1/444C02F1/463C02F1/4691C02F1/66C02F9/00C02F2001/425C02F2103/16
Inventor 陈鹏白旭强马光宇龙海萍胡绍伟伊源辉王飞刘芳张彦王凤云
Owner ANGANG STEEL CO LTD
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