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Pretreatment method of ceramics membrane of reverse osmosis for desalting seawater

A ceramic membrane and pretreatment technology, which is applied in seawater treatment, osmosis/dialysis water/sewage treatment, reverse osmosis, etc., can solve the problems of high cost of seawater desalination pretreatment, high energy consumption in operation, and low seawater recovery rate, etc., to achieve Thin separation layer, high throughput and long service life

Inactive Publication Date: 2008-03-05
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing seawater desalination process, such as low recovery rate of seawater, large operating energy consumption, and high pretreatment cost of seawater desalination, and proposes a ceramic membrane terminal filtration method to replace the existing ceramic membrane cross-flow filtration method , as a security filtration system for seawater desalination pretreatment

Method used

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  • Pretreatment method of ceramics membrane of reverse osmosis for desalting seawater

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Effect test

Embodiment 1

[0021] A ceramic membrane terminal filtration pretreatment method in the reverse osmosis seawater desalination process, which includes firstly using NaClO to sterilize and kill algae in the fresh seawater in the sedimentation tank, adding ferric chloride for flocculation and sedimentation, and using a multi-media filtration system to remove the Flocculated suspended solids, etc., the effluent enters the activated carbon filter, the activated carbon filtered liquid is pressurized to 0.05MPa and then enters the ceramic membrane terminal filtration unit. The turbidity of the effluent after the ceramic membrane terminal filtration pretreatment is 0.08NTU, and all indicators reach reverse osmosis. Membrane system requirements.

[0022] In this pretreatment system, the ceramic membrane is Al 2 O 3 Material, nominal pore diameter is 500nm, shape is 19-channel circular tube, single membrane module, 3 stages in series.

Embodiment 2

[0024] A ceramic membrane terminal filtration pretreatment method in the reverse osmosis seawater desalination process, which includes first using NaClO to sterilize and kill algae in the fresh seawater in the sedimentation tank, and the effluent is pressurized to 0.1MPa and then enters the ceramic membrane terminal filtration unit, and passes through the ceramic membrane The turbidity of the effluent from the terminal filtration pretreatment is 0.1NTU, and all the indicators meet the requirements of the reverse osmosis membrane system.

[0025] In this pretreatment system, the ceramic membrane is made of ZrO 2 , The nominal pore diameter is 200nm, the shape is 19-channel circular tube, single membrane module, 3 stages in series.

Embodiment 3

[0027] A ceramic membrane terminal filtration pretreatment method in the reverse osmosis seawater desalination process, which includes firstly using NaClO to sterilize and kill algae in the fresh seawater in the sedimentation tank, adding ferric chloride for flocculation and sedimentation, and using a multi-media filtration system to remove the Flocculated suspended solids, etc., the effluent enters the activated carbon filter, the activated carbon filter liquid is pressurized to 0.3MPa and then enters the ceramic membrane terminal filtration unit. The turbidity of the effluent after the ceramic membrane terminal filtration pretreatment is 0.05NTU, and all indicators reach reverse osmosis. Membrane system requirements.

[0028] In this pretreatment system, the ceramic membrane is Al 2 O 3 Material, nominal pore size is 200nm, shape is 19-channel circular tube, single membrane module, 5 stages in series.

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Abstract

A ceramic membrane pretreating method for the seawater to be desalinated by reverse osmosis features that after the seawater is pressurized to 0.05-0.8 MPa, it is forced to flow through a ceramic membrane filter unit. It can greatly decrease the load of reverse osmosis process and increase the quality and output of fresh water.

Description

Technical field [0001] The invention relates to seawater desalination technology, in particular to a novel seawater desalination ceramic membrane terminal filtration pretreatment method. Background technique [0002] Since the beginning of the 21st century, the shortage of fresh water resources has increasingly become an urgent problem for all countries in the world. Sea water resources are abundant. With the development of science and technology, human beings can ask for fresh water from the sea. Seawater has a high salt content. The purpose of seawater desalination is to remove these salts as much as possible to obtain fresh water, mainly including: distillation, reverse osmosis, freezing, hydration, solvent extraction, etc. Among them, reverse osmosis has broad application prospects and has been widely promoted. The reverse osmosis seawater desalination process is mainly composed of three parts: pretreatment, reverse osmosis and post-treatment. Among them, reverse osmosis is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44B01D61/02C02F103/08
CPCY02A20/131
Inventor 徐南平范益群邢卫红李卫星
Owner JIANGSU JIUWU HITECH
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