Bittern or seawater ultrafiltration pre-treatment process and system

A pretreatment and brine technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., can solve the problems of complex brine water quality and no brine, and shorten sewage discharge Time, effluent stability, and the effect of reducing pollutant content

Active Publication Date: 2014-12-17
TIANJIN MOTIMO MEMBRANE TECH +1
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Problems solved by technology

However, the water quality of brine is complex, and there are impurities such as suspended solids and microorganisms in the water body. For high-salt brine or seawater as the treatment object, the membrane method is used for treatment. The process

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  • Bittern or seawater ultrafiltration pre-treatment process and system
  • Bittern or seawater ultrafiltration pre-treatment process and system

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[0037] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0038] The schematic diagram of the brine or seawater ultrafiltration pretreatment system of the present invention is as follows figure 1 As shown, it includes a water inlet device, an ultrafiltration membrane filter device 55, a buffer water tank 56, a backwash device, a cleaning device, an air supply device, a backflow device, and a dosing device; the ultrafiltration membrane filter device 55 uses a hollow fiber external pressure Column type ultrafiltration membrane module. The ultrafiltration membrane filtration device 55 may be composed of multiple groups of hollow fiber external pressure column type ultrafiltration membrane modules in parallel according to actual needs.

[0039] The water inlet device includes a manual valve before the water supply pump 1, a water supply pump 2, a manual valve after the water supply pump 3, a raw water tank 23, a ...

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Abstract

The invention discloses a bittern or seawater ultrafiltration pre-treatment process and system. The bittern or seawater ultrafiltration pre-treatment process and system can provide filtered water meeting water feeding requirements of nanofiltration. Every process cycle of the bittern or seawater ultrafiltration pre-treatment process sequentially comprises a filtering step, a water producing step, a cleaning step and a discharging step, wherein the cleaning step comprises processes including gas wiping, gas-water backwashing and gas exhausting. Bittern or seawater is filtered through a cartridge filter and precisely-filtered liquor is filtered through a ultrafilter membrane filtering device to produce water; the gas exhausting process comprises that, during a membrane module exhaust process, oilless compressed air is inlet to the water inlet side of membrane yarns, and compressed air and water are mixed and oscillated to act on the surface of the membrane yarns; during the gas exhaust process, the water level decreases continuously, the gas-water washing strengths of the cross sections at different horizontal heights change, so that the membrane yarns can be cleaned from top to bottom. The bittern or seawater ultrafiltration pre-treatment process enables the bittern and seawater to be treated in a membrane filtering mode, thereby reducing the purification cost and simplifying the purification process, and through stable water output, prolongs the service life of nanofiltration membranes and guarantees stable operation of a nanofiltration system.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a brine or seawater ultrafiltration pretreatment process and a pretreatment system. Background technique [0002] Brine is rich in chemical resources, with a salt content as high as 2-6 times that of seawater. The largest content is sodium chloride, which is the basic raw material for the soda ash manufacturing industry. The brine can be effectively removed through the brine nanofiltration refining process Calcium, magnesium, and sulfate ions, and the water produced is used for chemical salt in the soda industry, which will greatly reduce the amount of raw salt in chemical salt production and reduce the cost of soda ash production. The water quality of brine is complex, and there are impurities such as suspended solids and microorganisms in the water body, so pretreatment is required to meet the requirements of nanofiltration influent. [0003] At present, the pretreatme...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/44B01D61/08B01D65/02
Inventor 戴海平孙磊柯永文党博航袁鑫楷
Owner TIANJIN MOTIMO MEMBRANE TECH
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