Method and system for resourceful treatment of high-salinity wastewater in metallurgical industry

Abstract

The invention relates to the field of metallurgical industry high-salinity wastewater resourceful reutilization treatment, and particularly discloses a metallurgical industry high-salinity wastewater resourceful treatment method which comprises the following steps: carrying out primary reverse osmosis treatment on high-salinity wastewater to obtain fresh water and concentrated water, introducing the fresh water into a reuse water tank, introducing the concentrated water into a subsequent treatment device, and carrying out secondary reverse osmosis treatment on the high-salinity wastewater. Performing ozone activated carbon treatment on the obtained concentrated water, performing tubular ultrafiltration treatment on the concentrated water, performing ion exchanger treatment on the concentrated water, performing homogeneous membrane electrodialysis system treatment on the concentrated water, and finally performing nanofiltration system treatment on the concentrated water. The method has the advantages of higher operation automation degree, lower requirement on inlet water quality, easiness in cleaning and low maintenance cost; the ozone activated carbon-tubular ultrafiltration system and the ozone catalytic oxidation and biological aerated filter are utilized, so that the occupied area is smaller, and the operation automation degree is higher; the homogeneous membrane electrodialysis system is used for replacing high-pressure reverse osmosis in the prior art, so that the operation pressure of the system is reduced, and the operation stability and safety of the system are improved.

Description

technical field [0001] The present invention relates to the technical field of waste water treatment, recovery and reuse, in particular to the field of resource recycling treatment of high-salt wastewater in the metallurgical industry, and in particular to a method and system for resource-based treatment of high-salt wastewater in the metallurgical industry. Background technique [0002] The most basic ecological resources in nature are water resources. Water is one of the most important precious resources in nature. Human life, production and social progress and development cannot be separated from water resources. Safe and high-quality water resources are even more related to the country. The overall development of the economy and society in the future. The shortage of water resources and the pollution of the water environment have become one of the important factors restricting the further development of the global economy and civilization, and are major problems to be so...

AI Technical Summary

Problems solved by technology

Such a large output of domestic raw salt still cannot meet the domestic demand, and it is necessary to import some raw salt to meet the domestic demand for raw salt

In 2018, the import volume of raw salt was about 9.18 million tons, and in 2019, the import volume of raw salt was about 7.65 million tons. Although it has decreased compared with 2018, the import volume of raw salt is still huge

[0017] At present, the main technological process adopted for the recycling of wastewater in the metallurgical industry is: high-efficiency clarifier → ozone catalytic oxidation → biological aerated filter → multi-media filter → ultrafiltration system → weak acid positive bed → primary reverse osmosis system → high-pressure reverse osmosis system → Nanofiltration and salt separation → Evaporation and crystallization, this treatment process is complicated, cumbersome to operate, occupies a large area, and the system operation stability is poor. Therefore, it is necessary to develop a new metallurgical wastewater treatment process to overcome the above technical problems

Images