Full-membrane-method seawater desalination treatment system and method

A treatment system, the technology of full-membrane method, applied in the field of full-membrane seawater desalination treatment system, can solve the problems of interception, separation, lengthy process chain, etc., and achieve the effect of high resistance to fouling and preventing fouling

Active Publication Date: 2020-12-15
烟台金正环保科技有限公司
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Problems solved by technology

The process chain of the entire treatment process is lengthy, and scale inhibitors are often added to prevent scaling, and various salts in seawater are not selectively intercepted and separated, and comprehensive utilization of seawater resources is not realized from the perspective of improving the utilization efficiency of salt resources in seawater

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  • Full-membrane-method seawater desalination treatment system and method

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[0034] Sea water quality index is: Na + Content 8391 mg / L, Ca 2+ Content 448 mg / L, Mg 2+ Content 930 mg / L, Cl- Content 16694 mg / L, SO 4 2- The content is 1700 mg / L. After the seawater is filtered by the security filter, it is separated and treated by the first-stage swirl disc tube negative charge nanofiltration unit to obtain the first-stage product water and the first-stage concentrated water, and the first-stage product water Na + Content 7842 mg / L, Ca 2+ The content is 268 mg / L, Mg 2+ Content 482 mg / L, Cl - Content 15695 mg / L, SO 4 2- content of 21 mg / L, and the interception rate of sulfate radical is 98.8%. + Content 7243 mg / L, Ca 2+ The content is 18 mg / L, Mg 2+ Content 23 mg / L, Cl - Content 14985 mg / L, SO 4 2- content of 2mg / L, the rejection rate of calcium ion is 93%, and the rejection rate of magnesium ion is 95%. + Content 43000 mg / L, Cl - Content 89910 mg / L, Ca 2+ The content is 98 mg / L, Mg 2 + The content is 130 mg / L. The produced water treated ...

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Abstract

The invention belongs to the field of sewage treatment, particularly relates to a full-membrane-method seawater desalination treatment system. The system comprises a first-stage flat plate type negative charge nanofiltration unit, a second-stage positive charge roll type nanofiltration unit and a high-pressure roll type reverse osmosis membrane unit which are connected in sequence. The invention discloses a method for treating seawater by using the system at the same time. Flat plate type nanofiltration and reverse osmosis coupling are creatively applied to the seawater desalination treatmentprocess, due to the special membrane element structure form of CDNF, the pollution and blockage resistance of the membrane element is superior to that of conventional nanofiltration, the pretreatmentprocess can be omitted, and the treatment cost is reduced; meanwhile, a negatively-charged flat nanofiltration membrane, positively-charged roll nanofiltration membrane and high-pressure roll reverseosmosis membrane coupling process is creatively used, so that salt resources in seawater can be effectively separated, and the subsequent salt comprehensive utilization difficulty and treatment cost are greatly reduced.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a full-membrane seawater desalination treatment system and method. Background technique [0002] Seawater desalination is an effective way to solve the shortage of coastal water resources. At present, from a large classification point of view, the methods used for desalination of seawater are distillation method and membrane method. The reverse osmosis membrane method has the advantages of low investment, small footprint, and low energy consumption. It has gradually replaced the distillation method and become the current mainstream seawater desalination technology. However, in the process of seawater treatment by the reverse osmosis membrane method, due to the fouling of the reverse osmosis membrane surface, the recovery rate of seawater desalination is low, and a large amount of scale inhibitor needs to be added to the raw water. The overall operating cost is still hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F103/08
CPCC02F9/00C02F1/442C02F1/04C02F1/441C02F2103/08Y02A20/131
Inventor 李越彪姜华李国亮张卓
Owner 烟台金正环保科技有限公司
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