Ceramic-diaphragm sewater pretreating method

A ceramic membrane and pretreatment technology, which is applied in seawater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of chemical cleaning of polymer membranes that are easy to break, membrane maintenance and replacement, etc. Low permeation flux and other issues, to achieve the effect of reliable technical guarantee, low cost, and increase permeation flux

Inactive Publication Date: 2007-11-14
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is: in order to solve the problems of low efficiency, poor effect and high cost of the existing seawater desalination pretreatment system, especially in order to overcome the severe clogging of the membrane pores caused by the use of microfiltration membranes and ultrafiltration membranes alone to treat seawater, the permeation flux Low cost, frequent chemical cleaning and other problems, as well as the problems of easy breakage of polymer membrane membranes, frequent membrane maintenance and replacement,

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  • Ceramic-diaphragm sewater pretreating method

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1 The seawater with a turbidity of 5-15 NTU is lifted to the multi-media filter by a centrifugal pump, the inlet pressure of the multi-media filter is 0-0.4 MPa, the outlet water of the multi-media filter enters the ceramic microfiltration membrane filtration unit, and the inlet pressure of the ceramic microfiltration membrane is 0 ~ 0.3MPa, the effluent enters the ceramic ultrafiltration membrane filtration unit, the inlet pressure of the ceramic ultrafiltration membrane is 0 ~ 0.25MPa, and the effluent of the ceramic ultrafiltration membrane feeds the reverse osmosis membrane. Ceramic microfiltration membrane reflux and multi-media filter effluent are mixed by ejector to become ceramic microfiltration membrane influent; ceramic ultrafiltration membrane reflux and ceramic microfiltration membrane effluent are mixed by ejector to be ceramic ultrafiltration membrane influent. The effluent turbidity of the ceramic ultrafiltration membrane is less than 0.3NTU, an...

Embodiment 2

[0025]Example 2 Seawater with a turbidity of 25 to 100 NTU has a turbidity of 5 to 15 NTU after sterilization, flocculation and precipitation, and is lifted to a multi-media filter by a centrifugal pump. The inlet pressure of the multi-media filter is 0 to 0.4 MPa. The outlet water enters the ceramic microfiltration membrane filtration unit, the inlet pressure of the ceramic microfiltration membrane is 0~0.3MPa, the outlet water enters the ceramic ultrafiltration membrane filtration unit, the inlet pressure of the ceramic ultrafiltration membrane is 0~0.28MPa, and the turbidity of the ceramic ultrafiltration membrane outlet water is less than 0.5NTU , SDI2 o 3 , the nominal pore size of the microfiltration membrane is 0.5μm, the nominal pore size of the ceramic ultrafiltration membrane is 100nm, the diameter of the membrane tube is 31mm, and the shape is a 7-channel circular tube. The number of membrane elements in each membrane shell is 7 membrane cores. The length of the mem...

Embodiment 3

[0026] Example 3 Seawater with a turbidity of 25 to 100 NTU, after sterilization, flocculation and sedimentation, has a turbidity of 5 to 15 NTU, and flows into the multi-media filter based on the potential difference, and the effluent of the filter enters the intermediate water tank, and the effluent of the intermediate water tank is lifted by a centrifugal pump to enter Ceramic microfiltration membrane filtration unit, ceramic microfiltration membrane inlet pressure 0 ~ 0.3MPa, effluent water enters ceramic ultrafiltration membrane filtration unit, ceramic ultrafiltration membrane inlet pressure 0 ~ 0.28MPa, ceramic ultrafiltration membrane effluent turbidity 2 o 3 , the nominal pore size of the microfiltration membrane is 0.2μm, the nominal pore size of the ceramic ultrafiltration membrane is 30nm, the diameter of the membrane tube is 30mm, and the shape is a 19-channel circular tube. The number of membrane elements in each membrane shell is 19 membrane cores. The length of ...

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Abstract

This invention relates to desalination of sea water and ceramics membrane seawater pretreatment means in seawater purification. This invention is composed by multimedia filter, ceramic microstraining membrane cell and ceramic hyperfiltration membrane cell, adopt seawater that cloudiness is less than 15NTU, pressurize to 0.1 to 0.5 mpa, then in turn enter the sea-water to tandem multimedia filter, ceramic microstraining membrane cell and ceramic hyperfiltration membrane cell to proceed pretreatment. The seawater after pretreatment can be used for reverse osmosis seawater desalting technology. The invention adopts inorganic ceramics membrane and multimedia filter, ceramic microstraining membrane cell and ceramic hyperfiltration membrane cell adopt one group pump as power supply, ceramic membrane circumfluence adopts ejector mixed with inlet influnt, so greatly save power consumption. After treatment, the seawater SDI is no greater than 3, cloudiness is not greater than 0.3NTU, PH is 7.5 to 8.4, free chlorine is not greater than 0.1 milligrams per liter, farther better than reverse osmosis membrane influent standard BG / T19249 - 2003 (SDI<5).

Description

technical field [0001] The invention relates to seawater desalination and seawater purification technology, in particular to a ceramic membrane seawater pretreatment method in seawater desalination and seawater purification. Background technique [0002] 96.5% of global water resources are marine salt water, only 3.5% are fresh water; while 2.5% of fresh water is polar plains, only 1% is available for human use. In addition to about 3% of inorganic salts and organic matter in seawater, 97% of it is fresh water. The total volume of seawater is about 1.37 billion cubic kilometers, which can be said to be an inexhaustible water resource. Exploitation and utilization of seawater resources and development of seawater utilization industries are the only way out to solve the water resource crisis in coastal areas. [0003] Desalination is the technology and process of obtaining fresh water from sea water. It is realized by physical, chemical or physicochemical methods. There ar...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F103/08
CPCY02A20/131
Inventor 马敬环
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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