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NF-RO-MD salt fractionation and desalination system

A 1.NF-RO-MD, salt separation technology, applied in the field of chemical engineering, can solve the problem of increasing the concentration of emissions, not completely solving the problem of zero discharge of wastewater, and achieve the effect of good system stability

Pending Publication Date: 2017-12-15
DALIAN UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The previous membrane salt separation technology can only partially recover water and salt, and realize the reduction of wastewater, but it increases the concentration of the discharge, and does not completely solve the problem of zero discharge of wastewater [Jiang Yingzi. Membrane reverse osmosis concentrated brine treatment process Application [J]. Low Carbon World, 2017, (05): 12-13.]
Generally speaking, there is no desalination and salt separation system that only uses membrane method to desalinate wastewater.

Method used

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Embodiment 1

[0039] The coal chemical process consumes a lot of water, and the production wastewater contains complex components. However, after pretreatment, biochemical treatment and advanced treatment, the remaining wastewater mainly contains sodium chloride and sodium sulfate. At present, there are various problems in the zero-discharge liquid of wastewater in operation: incomplete separation of COD, unstable crystallization process, inability to separate and crystallize the main salt, etc. The concentration of the treated brine is coal chemical wastewater, and the treated solution only contains sodium chloride and sodium sulfate with a sodium chloride content of 2325ppm and a sodium sulfate content of 1331ppm. The steps of desalination and salt separation are as follows: figure 2 Shown:

[0040] (1) The above solution is sent to the first reverse osmosis unit for concentration, the concentrated solution enters the first nanofiltration unit, and the filtrate of the first reverse osmo...

Embodiment 2

[0061] The brine treated was likewise a sodium chloride and sodium sulfate solution with a sodium chloride content of 2325 ppm and a sodium sulfate content of 1331 ppm. Salt separation and desalination steps such as Image 6 :

[0062] (1) The above solution is sent to the first reverse osmosis unit for concentration, the concentrated solution enters the first nanofiltration unit, and the filtrate of the first reverse osmosis unit is sent to the fifth reverse osmosis unit of the reverse osmosis unit.

[0063] (2) Send the concentrate in the first reverse osmosis unit to the first nanofiltration unit. The first nanofiltration unit concentrated solution will enter the second nanofiltration unit in the sodium sulfate concentrated operating system to concentrate because the sodium sulfate content accounts for the ratio of the total salt ratio higher than the sodium sulfate content in the first reverse osmosis unit concentrated solution; The ratio of sodium chloride content in th...

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Abstract

The invention belongs to the technical field of chemical engineering, relates to a method for industrial wastewater treatment and a membrane separation related technology, in particular to a method for salt fractionation and desalination of concentrated brine by utilizing combined multi-stage membrane separation technologies, and provides a NF-RO-MD salt fractionation and desalination system to achieve zero discharge and resource utilization of industrial wastewater. The system comprises three membrane process treatment units for nanofiltration (NF), reverse osmosis (RO) and membrane distillation (MD). Multiple schemes can be adopted for desalination and salt fractionation of the same type of wastewater, a process flow contained in each desalination and salt fractionation scheme is also varied, and arrangement and combination ways of the process flows include but are not limited to any combination and arrangement orders of the filtration method. No matter how many stages of treatment and what kind of arrangement and combination ways are adopted, a purpose to achieve is that the purity of monovalent salt or high-valence salt in crystalline salt is up to 90wt% or above, and separated effluent meets the reuse standard or at least meets the discharge standard of the industry.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, and relates to a method for treating industrial wastewater and related technologies of membrane separation, in particular to a system for desalting and separating concentrated brine by using multi-stage membrane separation technology in combination. Background technique [0002] In recent years, the country's implementation of zero discharge of industrial wastewater has become more and more intensive. Zero discharge of industrial wastewater and resource utilization have also become the goals of more companies. As a new desalination method, membrane desalination has been rapidly developed, and it is also playing an increasingly important role in the field of water treatment. [0003] The membranes used in membrane desalination generally include four categories according to the driving force: [0004] 1. Pressure driven membrane: including microfiltration membrane, ultrafiltration me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/441C02F1/442C02F1/447C02F2301/08Y02W10/33Y02W10/37Y02A20/131
Inventor 郭飞安硕蔡景成王迈从硕刘丽辉
Owner DALIAN UNIV OF TECH