Reduction treatment method for high-salt wastewater

Abstract

The invention relates to a reduction treatment method for high-salt wastewater. According to the method, the high-salt wastewater is pretreated and then subjected to reduction treatment, and reduction treatment comprises preliminary reduction treatment and deep concentration treatment; specifically, the pretreated wastewater is subjected to preliminary reduction treatment through a medium-pressure reverse osmosis device and a high-pressure reserve osmosis device, reverse osmosis production water and a reverse osmosis concentrated salt solution are obtained, the reverse osmosis concentrated salt solution is treated through a fed water adjustment and monitoring device and then sent to a first-level electric drive ion membrane unit and a second-level electric drive ion membrane for deep concentration treatment, and a high-concentration salt solution is obtained. With the adoption of the reduction treatment method for the high-salt wastewater, 95% or more of the wastewater solution can be recovered to a fresh water tank, and the wastewater is recycled.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a reduction treatment method for high-salt wastewater in the zero-discharge technology of industrial wastewater. Background technique [0002] In recent years, with the rapid development of petrochemical, electric power, metallurgy, coal chemical and other industries, the amount of sewage with complex salt content such as reverse osmosis concentrated water, industrial sewage, recycled sewage and some process sewage produced in the industrial production process has increased year by year. , how to finally treat and utilize these salty sewage with complex components has received extensive attention. As the country's control over corporate sewage discharge is becoming increasingly stringent, especially in areas where water resources are scarce, how to properly treat and utilize this part of sewage with complex salt content and achieve zero discharge of waste water is c...

AI Technical Summary

Problems solved by technology

The general water recycling rate of the reverse osmosis water production system can only reach about 75%, and about 25% of the concentrated water in the water production system cannot be recycled and needs to be discharged

Because the concentrated water of these salt-containing complex wastewater contains a large amount of calcium ions, magnesium ions, heavy metal ions, silicon ions and colloidal substances, and some chemical wastewater contains a large amount of non-degradable organic and inorganic salts and is closely related to the production process. Related complex components, direct discharge will cause water pollution to the river into which it is discharged

Although the reverse osmosis treatment has achieved a certain degree of reduction treatment, the concentrated salts still remain in the discharged concentrated water. At present, this type of wastewater treatment method generally adopts simple treatment and then discharges or directly discharges, which has an impact on the surrounding environment. It is becoming more and more serious, and finally the disposal of this part of reverse osmosis concentrated water is a difficult problem

[0005] The second is the complex salty wastewater concentrated by low-pressure, medium-pressure and high-pressure reverse osmosis. When the reverse osmosis treatment method is used to treat the organic pollution of the membrane elements and the saturated inorganic salt calcium and magnesium compounds are prone to scaling problems on the membrane surface

However, this system only performs pretreatment and reverse osmosis treatment on wastewater, and the water resource recycling rate of wastewater is low, and there is a big problem of waste of water resources. The energy consumption of the liquid increases the cost of wastewater treatment and environmental issues

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