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Pretreatment method of ceramics membrane of reverse osmosis for desalting seawater

A ceramic membrane and pretreatment technology, applied in seawater treatment, osmosis/dialysis water/sewage treatment, reverse osmosis, etc., can solve the problems of high cost of seawater desalination pretreatment, high operating energy consumption, low seawater recovery rate, etc. The effect of thin separation layer, high throughput and long service life

Inactive Publication Date: 2006-04-19
JIANGSU JIUWU HITECH
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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 the fresh seawater in the settling tank, adding ferric chloride for flocculation and sedimentation, and using a multi-media filtration system to remove Flocculation of suspended solids, etc., the effluent enters the activated carbon filter, and the liquid filtered out of the activated carbon is pressurized to 0.05MPa and then enters the ceramic membrane terminal filter unit. The turbidity of the effluent pretreated by the ceramic membrane terminal filtration is 0.08NTU, and all indicators have reached reverse osmosis. Membrane system requirements.

[0022] In this pretreatment system, the ceramic membrane is Al 2 o 3 The material has a nominal pore size of 500nm, a circular tubular shape with 19 channels, a single membrane module, and 3 stages in series.

Embodiment 2

[0024] A ceramic membrane terminal filtration pretreatment method in the process of reverse osmosis seawater desalination, which includes firstly using NaClO to sterilize the fresh seawater in the settling tank to sterilize and kill algae, and then pressurize the effluent to 0.1MPa and then enter the ceramic membrane terminal filter unit, pass through the ceramic membrane The effluent turbidity of terminal filtration pretreatment is 0.1NTU, and all indicators meet the requirements of reverse osmosis membrane system.

[0025] In this pretreatment system, the ceramic membrane is made of ZrO 2 , the nominal pore size is 200nm, the shape is a 19-channel circular tube, a single membrane module, and 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 the fresh seawater in the settling tank, adding ferric chloride for flocculation and sedimentation, and using a multi-media filtration system to remove Flocculation of suspended solids, etc., the effluent enters the activated carbon filter, and the liquid filtered by the activated carbon is pressurized to 0.3MPa and then enters the ceramic membrane terminal filter unit. The turbidity of the effluent after pretreatment of the ceramic membrane terminal filtration is 0.05NTU, and all indicators have reached reverse osmosis. Membrane system requirements.

[0028] In this pretreatment system, the ceramic membrane is Al 2 o 3 The material has a nominal pore size of 200nm, a circular tubular shape with 19 channels, a single membrane module, and 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 entering the 21st century, the shortage of fresh water resources has increasingly become an urgent problem for countries all over the world to solve. Sea water is rich in resources. 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, the reverse osmosis method 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 posttreatment. Among them, re...

Claims

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Application Information

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Patent Type & Authority Applications(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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