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Ceramic film pretreatment method in desalination of sea water

A pretreatment and ceramic membrane technology, applied in seawater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of microfiltration membrane pore clogging, frequent chemical cleaning, low permeation flux, etc., and achieve load reduction , Long continuous operation time, improve the effect of permeation flux

Inactive Publication Date: 2009-10-28
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is: in order to solve the problems of low efficiency and poor effect of the existing seawater desalination pretreatment system, especially in order to overcome the problems of serious clogging of microfiltration membrane membrane pores, low permeation flux, frequent chemical cleaning, etc., using ceramic ultrafiltration The excellent material properties and separation performance of the membrane are used for seawater pretreatment to further improve the effluent water quality, reduce operating costs, and ensure the stable and continuous operation of the reverse osmosis seawater desalination system to the greatest extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After the seawater is pressurized to 0.6MPa, it enters the ceramic ultrafiltration membrane filtration unit. The turbidity of the effluent pretreated by the ceramic ultrafiltration membrane is 0.05NTU, and all indicators meet the requirements of the reverse osmosis membrane system.

[0020] In this pretreatment system, the ceramic ultrafiltration membrane is ZrO 2 The material has a nominal pore size of 20nm, a circular tubular shape with 19 channels, 7 membrane modules, and 2 stages in series; the flow rate of seawater on the membrane surface is 3 m / s.

Embodiment 2

[0022] A ceramic ultrafiltration membrane pretreatment method in the process of reverse osmosis seawater desalination, 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 the The flocculated suspended matter, etc., the effluent enters the activated carbon filter, and the liquid filtered by the activated carbon is pressurized to 0.6MPa and then enters the ceramic ultrafiltration membrane filtration unit. The turbidity of the effluent pretreated by the ceramic ultrafiltration membrane is 0.05NTU, and all indicators have reached Requirements for reverse osmosis membrane systems.

[0023] In this pretreatment system, the ceramic ultrafiltration membrane is TiO 2 The material has a nominal pore diameter of 50nm, a circular tubular shape with 37 channels, 37 membrane modules, and 3 stages in series; the flow rate of seawater on the membr...

Embodiment 3

[0025] A ceramic ultrafiltration membrane pretreatment method in the process of reverse osmosis seawater desalination, 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 the The flocculated suspended solids, etc., are pressurized to 0.8MPa and enter the ceramic ultrafiltration membrane filtration unit. The turbidity of the effluent pretreated by the ceramic ultrafiltration membrane is 0.05NTU, and all indicators meet the requirements of the reverse osmosis membrane system.

[0026] In this pretreatment system, the ceramic ultrafiltration membrane is Al 2 o 3 The material has a nominal pore size of 10nm, a circular tubular shape with 37 channels, 19 membrane modules, and 3 stages in series; the flow rate of seawater on the membrane surface is 0.5 m / s.

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Abstract

The invention relates to sea water desalination method particular to ceramics ultrafiltration membrane pretreatment, which is characterized in that compressing sea water to 0.1-0.8MPa to enter the said membrane filter unit, retentioning the residue on inlet side, and the pretreatment water accords to require of reverse osmosis system. This method realizes the precise filter, reduces the treatment load, and can replace existing technique.

Description

technical field [0001] The invention relates to seawater desalination technology, in particular to a ceramic ultrafiltration membrane pretreatment method in seawater desalination. 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, reverse o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/00C02F1/44C02F1/52C02F103/08
CPCY02A20/131
Inventor 徐南平邢卫红范益群李卫星
Owner JIANGSU JIUWU HITECH
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