High-salt-content wastewater circulation treatment process

Abstract

The invention discloses a high-salt-content wastewater circulating treatment process which comprises the following steps: desalting by a hollow fiber nanofiltration membrane; concentrating: softening the concentrated water of the hollow fiber nanofiltration membrane until the hardness reaches the water inlet condition of a reverse osmosis membrane, then carrying out reverse osmosis concentration coupled chemical induced crystallization desalination, continuously carrying out reverse osmosis concentration circular treatment on the chemically induced crystallization effluent, gradually concentrating to obtain a concentrated solution, and recycling the reverse osmosis concentrated water; and performing nanofiltration. The hollow fiber nanofiltration membrane technology is adopted to partially remove salt ions in the mine water under low pressure, RO < + > chemical induced crystallization is used to improve the water production rate of the first-stage RO, the bipolar ion exchange membrane technology is used to treat the high-salt concentrated solution and obtain a recyclable acid-base solution, real zero discharge of wastewater is realized, and the method is suitable for industrial production. And the water production rate of RO is improved to 90% or above.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment industry, and in particular relates to a process for circulating treatment of high-salt wastewater. Background technique [0002] At present, the resource utilization of industrial wastewater has attracted more and more attention. In the era of energy conservation, emission reduction and environmental protection, zero discharge and resource treatment of high-salt wastewater is an inevitable trend in the treatment of high-salt wastewater. Some enterprises will produce a large amount of high-salt wastewater in the production, among which the content and concentration of sodium chloride and sodium sulfate are high, so the efficient treatment of high-salt wastewater is imminent. [0003] In the field of wastewater treatment, saline wastewater is a relatively common wastewater, and usually contains more salt in saline wastewater. The direct discharge of these salts can cause serious adve...

AI Technical Summary

Problems solved by technology

When dealing with these waste water, it often needs to consume more heat, which will bring additional waste of resources.

However, traditional treatment methods are difficult to achieve full utilization of heat, and it is difficult to effectively remove the salt in wastewater