Intensified deep concentration system for high-salt-content industrial wastewater and technology thereof

Abstract

The invention discloses an intensified deep concentration system for high-salt-content industrial wastewater and a technology thereof and belongs to the field of water treatment. The high-salt-content industrial wastewater is adjusted through an adjusting tank, settled through a softening settling pond, filtered through a V-type filter tank, filtered through an ultrafiltration device in an intensified mode and concentrated through a first-stage reverse osmosis device, then the hardness is removed through an ion exchange resin device, and salt separation is performed through a nanofiltration device; thick water of the nanofiltration device is concentrated through a frequent electrode transfer electrodialysis device, produced water is oxidized through an advanced oxidization device and then enters a general produced water tank, and thick water is crystallized through a freezing crystallization system and crystallized with sodium sulfate; produced water of the nanofiltration device is concentrated through a second-stage reverse osmosis device and concentrated again through the frequent electrode transfer electrodialysis device, produced water is oxidized through the advanced oxidization device and enters the general produced water tank, and thick water is crystallized through an MVR evaporative crystallization device and crystallized with sodium chloride. The intensified deep concentration system has the advantages that potential safety hazards caused by high-pressure operation are effectively reduced; the problem that the COD content is high after thick salt water is highly concentrated is effectively solved, the purity of crystallized salt is improved, and the using value of the crystallized salt is improved; the system is high in automation degree, easy to operate, low in operation pressure, stable in operation, high in purity of the crystallized salt, low in operation cost and the like.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a full-process treatment system and a process thereof for high-salt industrial waste water with salt separation and zero discharge. Background technique [0002] The high-salt industrial waste water described in the present invention mainly comes from coal chemical industry, petrochemical industry and other industries. The high-salt industrial wastewater in the coal chemical industry, petrochemical industry and other industries mainly comes from the washing wastewater in the production process, the condensate of the process system, the drainage of chemical water stations, the sewage of circulating water, etc. It is characterized by high salt content, high hardness, complex composition, refractory organic matter, and large fluctuations in water quality. With the adjustment of the national environmental protection policy, the state requires industrial wastewater discharge enterprises ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many treatment methods for high-salt industrial wastewater at home and abroad, but they all have the defects of high operating cost, low water recovery rate, mostly mixed salt crystallization salt, low quality, and incapable of resource utilization.

Images