A kind of full membrane seawater desalination treatment system and method

A treatment method, full-membrane technology, applied in seawater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of lengthy process chain, interception, separation, etc., achieve high resistance to fouling and prevent fouling Effect

Active Publication Date: 2022-08-09
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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  • A kind of full membrane seawater desalination treatment system and method

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[0034] The 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- Content 1700 mg / L. After the seawater is filtered by the security filter, it is separated and processed by the first-level cyclone disc tube type negatively charged nanofiltration unit to obtain the first-level product water and the first-level concentrated water, and the first-level 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- The content is 21 mg / L, and the retention rate of sulfate radicals 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- The content is 2mg / L, the calcium ion rejection rate is 93%, and the magnesium ion rejection rate is 95%. + Content 43000 mg / L, Cl - Content 89910 mg / L, Ca 2+ The content is 98 mg / L, Mg 2+ Content 130 mg / L. The product water treated b...

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Abstract

The invention belongs to the field of sewage treatment, and in particular relates to an all-membrane seawater desalination treatment system, comprising a first-level flat plate type negatively charged nanofiltration unit, a second-level positively charged coiled nanofiltration unit, and a high-pressure coiled reverse nanofiltration unit, which are connected in sequence. Permeable membrane unit, the invention also discloses a method for treating seawater by using the system. The invention creatively applies the coupling of flat-plate nanofiltration and reverse osmosis to the seawater desalination process. Due to the special structure of the membrane element of CDNF, its anti-fouling performance is better than that of conventional nanofiltration, and the pretreatment process can be omitted. Using the coupling process of negatively charged flat nanofiltration membrane, positively charged rolled nanofiltration membrane, and high-pressure rolled reverse osmosis membrane, the salt resources in seawater can be effectively separated, which greatly reduces the difficulty and treatment of subsequent comprehensive salt utilization. cost.

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] Desalination is an effective way to solve coastal water shortages. At present, from the perspective of large classification, the methods used in seawater desalination are distillation and membrane methods. The reverse osmosis membrane method has the advantages of low investment, small footprint and low energy consumption, and gradually replaced the distillation method as the current mainstream seawater desalination technology. However, in the process of reverse osmosis membrane treatment of seawater, due to the scaling problem on 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 high, and the composition of concentrated water i...

Claims

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Application Information

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Patent Type & Authority Patents(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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