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A method for controlling organic micro-pollutants in drinking water by combined process of photocatalysis, ultrafiltration and nanofiltration

A combined process and photocatalytic technology, applied in the field of water treatment, can solve the problems of small molecular weight of organic matter, difficult oxidative degradation, low ozone utilization rate, etc., and achieve the effects of high quality water quality, good degradation effect and low concentration

Active Publication Date: 2020-11-06
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, activated carbon is used in conjunction with other methods to remove organic micro-pollution in water, such as ozone-activated carbon technology to remove organic pollutants in water, but this method has the following defects: ①Ozone oxidation treatment of drinking water has low ozone utilization rate and insufficient oxidation capacity and other defects; ②Ozone can effectively degrade organic pollutants containing unsaturated bonds or some aromatics, but it is difficult to oxidize and degrade some stable organic micropollutants (such as pesticides, halogenated organic compounds and nitro compounds); ③Ozone can Oxidizing macromolecular organic matter into small molecular organic matter will reduce the molecular weight of organic matter, which will not be conducive to the adsorption of activated carbon. Therefore, how to avoid the shortcomings of the above methods is a key problem that needs to be solved urgently in engineering.

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  • A method for controlling organic micro-pollutants in drinking water by combined process of photocatalysis, ultrafiltration and nanofiltration

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: In this embodiment, the raw water adopts laboratory water distribution, and the specific water quality conditions are as follows

[0022] water quality index unit value DOC mg / L 3.85 Bisphenol A mg / L 1.2 Turbidity NTU 4.85 Conductivity μs / cm 5000

[0023] The pretreatment unit adopts coagulation-sedimentation-microfiltration, and the coagulant adopts polyaluminum chloride in an amount of 12 mg / L (calculated by commercial quality). The pipeline mixer is used in the coagulation stage, the mechanical stirring mixing tank is used in the reaction stage, and the inclined tube sedimentation tank is used in the sedimentation stage, and the particle size of titanium dioxide is 1.0 μm.

[0024] The ultrafiltration tubular membrane is a PVDF tubular ultrafiltration membrane with a molecular weight cut off of 8000. After 1 hour of adsorption in the photocatalytic pool, turn on the UV lamp for photocatalysis, and perfo...

Embodiment 2

[0027] Embodiment 2: In this embodiment, the raw water adopts laboratory water distribution, and the specific water quality conditions are as follows

[0028] water quality index unit value DOC mg / L 4.15 Atrazine mg / L 0.5 Turbidity NTU 5.95 Conductivity μs / cm 6000

[0029]The pretreatment unit adopts coagulation-sedimentation-microfiltration, and the coagulant adopts polyaluminum chloride in an amount of 12 mg / L (calculated by commercial quality). The pipeline mixer is used in the coagulation stage, the mechanical stirring mixing tank is used in the reaction stage, and the inclined tube sedimentation tank is used in the sedimentation stage, and the particle size of titanium dioxide is 1.0 μm.

[0030] The ultrafiltration tubular membrane is a PVDF tubular ultrafiltration membrane with a molecular weight cut off of 8000. After 1 hour of adsorption in the photocatalytic pool, turn on the UV lamp for photocatalysis, and perform u...

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Abstract

A method for controlling organic micro-pollutants in drinking water through a combined process of photocatalysis, ultrafiltration and nanofiltration, belonging to the field of water treatment technology. The photocatalytic pool and ultrafiltration are used as pretreatments for nanofiltration membrane treatment. The photocatalytic pool and ultrafiltration are set up in front of the nanofiltration membrane pool to degrade dissolved organic matter and organic micro-pollutants in the water; the photocatalytic pool is further used for adsorption and degradation. , reduce the pollution of ultrafiltration and nanofiltration membranes, improve the service life of ultrafiltration and nanofiltration membranes, and use photocatalytic cells and ultrafiltration as pretreatment units for nanofiltration membrane treatment to reduce ultrafiltration and nanofiltration membrane pollution.

Description

technical field [0001] The invention relates to drinking water treatment technology, in particular to an ultrafiltration and nanofiltration double-membrane method and a method for removing organic micro-pollutants in water by photocatalysis, and belongs to the technical field of water treatment. Background technique [0002] With the increasing shortage of water resources and the further improvement of water quality standards in our country, the advanced treatment technology and research of drinking water are urgent. Conventional drinking water treatment processes, namely coagulation, sedimentation, sand filtration and disinfection processes, can clarify water and eliminate some pathogenic bacteria, but they have limited ability to remove many toxic and harmful organic pollutants produced in the process of industrialization. Especially for medium or small molecular weight organic substances, the removal ability is very poor, which poses a great threat to human health. On th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F1/32B01J21/06C01G23/053C02F101/30
CPCC01G23/0532C02F1/325C02F9/00B01J21/063C02F2305/10C02F2101/30C02F1/442C02F1/444B01J35/39
Inventor 杨艳玲郭婷婷李星王男
Owner BEIJING UNIV OF TECH