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Positive osmosis-multi-effect distillation coupling seawater desalination system and method

A multi-effect distillation and forward osmosis technology, applied in the field of seawater desalination technology coupled with forward osmosis-multi-effect distillation, can solve problems such as inability to operate for a long time, flux decline, membrane fouling, etc., to achieve calcium and magnesium precipitation, fresh water Improvement of recovery rate and effect of volume reduction

Pending Publication Date: 2019-05-24
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

The reverse osmosis method has the advantages of simple equipment, short construction period, convenient operation, low energy consumption, and strong adaptability. However, the requirements for the feedstock of reverse osmosis are much higher than those of thermal methods. 0.5NTU, SDI is less than 5, otherwise membrane fouling will easily occur, resulting in a rapid decline in flux and unable to operate for a long time

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  • Positive osmosis-multi-effect distillation coupling seawater desalination system and method
  • Positive osmosis-multi-effect distillation coupling seawater desalination system and method

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Embodiment Construction

[0032] Such as figure 1 As shown, the present invention provides a forward osmosis coupled multi-effect distillation seawater desalination system, including: seawater pretreatment equipment 1, low-temperature multi-effect seawater desalination unit 2, forward osmosis unit 3, high-temperature multi-effect draw solution recovery unit 4; ,

[0033] Seawater pretreatment equipment 1 can adopt one or more of the measures such as coagulation and sedimentation to remove turbidity, sterilization and algae treatment, softening or scale inhibition treatment, degassing treatment, and residual chlorine removal treatment, and the total suspended solids content of seawater should be guaranteed (TSS) is less than 300mg / L to meet the requirements of low-temperature multi-effect water inflow, and the pretreated seawater enters the low-temperature multi-effect evaporation seawater desalination unit 2;

[0034] The low-temperature multi-effect seawater desalination unit 2 includes a multi-effe...

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Abstract

The invention provides a positive osmosis-multi-effect distillation coupling seawater desalination system and method. The positive osmosis-multi-effect distillation coupling seawater desalination system comprises a low-temperature multi-effect seawater desalination unit, a positive osmosis unit and a high-temperature multi-effect draw solution unit, and the low-temperature multi-effect seawater desalination unit comprises a multi-effect evaporation room, a heat exchanger, a condenser and a preheater, and desalinates pretreated seawater, so that fresh water and concentrated seawater are obtained; the positive osmosis unit is used for secondary concentration conducted on the concentrated seawater of the low-temperature multi-effect seawater desalination unit; the high-temperature multi-effect draw solution unit is used for recovering a positive osmosis draw solution and generating fresh water. Through positive osmosis-multi-effect distillation coupling seawater desalination system and method, industrial waste heat grading utilization can be realized, meanwhile, the recovery rate of the fresh water generated by desalination of the seawater can be increased, and deep concentration of the low-temperature multi-effect concentrated seawater can be realized.

Description

technical field [0001] The invention belongs to the field of seawater desalination and resource utilization of concentrated seawater, and relates to a forward osmosis-multi-effect distillation coupled seawater desalination system, in particular, relates to a forward osmosis-multi-effect distillation coupled seawater desalination process, including Low-temperature multi-effect seawater desalination unit, forward osmosis unit and high-temperature multi-effect draw liquid recovery unit. The forward osmosis unit is used for the secondary concentration of concentrated seawater in the low-temperature multi-effect seawater desalination unit, and the high-temperature multi-effect draw solution recovery unit is used for the recovery of the forward osmosis draw solution and the generation of fresh water. The invention can realize graded utilization of industrial waste heat, and at the same time can realize the improvement of the fresh water recovery rate of seawater desalination and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/08
CPCY02A20/131
Inventor 孙玉柱杨烨宋兴福于建国
Owner EAST CHINA UNIV OF SCI & TECH
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