Ceramic-diaphragm sewater pretreating method

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...

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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, using the excellent material characteristics and separation performance of ceramic ultrafiltration membranes, through the combination of multi-media filtration, microfiltration and ultrafiltration units Carry out seawater pretreatment to further improve the effluent water quality, ensure the long-term and high-flux operation of the membrane modules, reduce the pollution load of a single type of membrane, reduce operating costs, and ensure the stable and continuous operation of the reverse osmosis seawater desalination system to the greatest extent

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