High-salt-content wastewater circulation treatment process

A waste water recycling and treatment process technology, applied in mining waste water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult to effectively remove the salt content of waste water, difficult to make full use of heat, waste of resources, etc. , to reduce the outsourcing cost of acid and alkali, reduce the amount of concentrated brine water, and improve the water production rate.

Pending Publication Date: 2022-07-22
SUZHOU JOYFA ENVIRONMENTAL TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-salinity wastewater recycling process, comprising the following steps:

[0023] S1 hollow fiber nanofiltration membrane desalination: the salt-containing mine water pretreated by suspended solids enters the hollow fiber nanofiltration membrane device to retain soluble monovalent or divalent inorganic salts under the pressure of 0.3MPa, and obtain hollow fiber nanofiltration membrane water production and hollow fiber nanofiltration membrane concentrated water, the hollow fiber nanofiltration membrane produced water is reused;

[0024] S2 concentration: the hollow fiber nanofiltration membrane concentrated water is softened until the hardness reaches the reverse osmosis membrane influent condition, and then reverse osmosis concentration coupled with chemically induced crystallization and desalination is performed, and the chemically induced crystallization effluent continues to undergo reverse osmosis concentration cycle treatment, gradually The concentrated soluti...

Embodiment 2

[0035] A high-salinity wastewater recycling process, comprising the following steps:

[0036] S1 hollow fiber nanofiltration membrane desalination: the salt-containing mine water pretreated by suspended solids enters the hollow fiber nanofiltration membrane device to intercept soluble monovalent or divalent inorganic salts under the pressure of 3MPa, and obtain the hollow fiber nanofiltration membrane production water and Hollow fiber nanofiltration membrane concentrated water, the hollow fiber nanofiltration membrane produced water is reused;

[0037] S2 concentration: the hollow fiber nanofiltration membrane concentrated water is softened until the hardness reaches the reverse osmosis membrane influent condition, and then reverse osmosis concentration coupled with chemically induced crystallization and desalination is performed, and the chemically induced crystallization effluent continues to undergo reverse osmosis concentration cycle treatment, gradually The concentrated s...

Embodiment 3

[0048] A high-salinity wastewater recycling process, comprising the following steps:

[0049] S1 hollow fiber nanofiltration membrane desalination: the salt-containing mine water pretreated by suspended solids enters the hollow fiber nanofiltration membrane device to intercept soluble monovalent or divalent inorganic salts under the pressure of 6MPa, and obtain hollow fiber nanofiltration membrane production water and Hollow fiber nanofiltration membrane concentrated water, the hollow fiber nanofiltration membrane produced water is reused;

[0050] S2 concentration: the hollow fiber nanofiltration membrane concentrated water is softened until the hardness reaches the reverse osmosis membrane influent condition, and then reverse osmosis concentration coupled with chemically induced crystallization and desalination is performed, and the chemically induced crystallization effluent continues to undergo reverse osmosis concentration cycle treatment, gradually The concentrated solut...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/10
CPCC02F9/00C02F1/442C02F1/441C02F1/66C02F2001/5218C02F1/4695C02F1/041C02F2103/10
Inventor 丁治椿仲文谭建凯
Owner SUZHOU JOYFA ENVIRONMENTAL TECH CORP LTD
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