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Method for removing trace pollutants in tap water by catalytic oxidation combined membrane treatment technology

A technology of trace pollutants and catalytic oxidation, applied in water pollutants, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of disinfection by-products, low removal rate of inorganic small molecule pollutants, etc., and enhance the degradation ability. , Improve electron utilization and reaction efficiency, good electrocatalytic activity and conductivity

Active Publication Date: 2022-04-01
首功智能制造(黑龙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, although catalytic oxidation can promote the removal of refractory organic matter in water by ozone, it will also produce some disinfection by-products at the same time, resulting in the production of small molecule organic pollutants (such as haloacetic acid, trihaloethane)
Moreover, the removal rate of inorganic small molecule pollutants by traditional catalytic oxidation technology is still very low.

Method used

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  • Method for removing trace pollutants in tap water by catalytic oxidation combined membrane treatment technology
  • Method for removing trace pollutants in tap water by catalytic oxidation combined membrane treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare multi-metal Ti composite oxide as anode material, the specific preparation process is as follows:

[0043] (1) First cut the Ti plate to the required size, and then pre-treat the Ti plate. The pre-treatment is surface cleaning treatment, including degreasing and deoxidizing film on the surface of the metal layer.

[0044] (2) The pretreated Ti plate was treated by surface etching technology, specifically, a mixed solution of hydrofluoric acid and nitric acid with a volume ratio of 1:3 was used for 1 min.

[0045] (3) The preparation process of the mixture slurry of metal and metal oxide is: with acetone as solvent, metal Ti, multi-metal composite oxide (0.05% aluminum, 0.05% tin, 0.90% antimony, 0.5% nickel, 0.5% Iron, 0.3% iridium, 0.2% yttrium, 1.0% platinum, 2.0% titanium oxide, 1.0% yttrium oxide, 1.0% chromium oxide, 1.0% iridium oxide, 1.0% nickel oxide, 1.0% antimony oxide, 1.0% tin oxide, 1.0% nickel oxide), Ti 3 SiC 2 The nano conductive ceramic powd...

Embodiment 2

[0050] Prepare Pt / Ti composite material as cathode material, the specific preparation process is as follows:

[0051] (1) For Pt / Ti / SiO 2 / Si negative film is pretreated, and the pretreatment is surface cleaning;

[0052] (2) Metal and metal oxide are mixed to make metal / metal oxide metal target by powder metallurgy method, the specific metal / metal oxide metal target is made of Pt, Ti, metal composite material (0.06% titanium, 0.10% chromium, 0.03% yttrium, 1.2% aluminum oxide, 1.50% chromium oxide, 1.20% platinum oxide, 0.5% nickel oxide, 0.08% zinc oxide, 0.5% selenium oxide, 1.10% titanium oxide, 1.10% manganese oxide material, 0.08% antimony oxide, 0.5% tin oxide, 0.02% yttrium oxide, 0.03% nickel oxide) in proportions of 12%, 80% and 8%;

[0053] ③Under vacuum conditions, pre-sputter Ti in an inert gas Ar atmosphere, with a current density of 10mA / cm 2 , the pre-sputtering time is 5min;

[0054] ④ Introduce oxygen, and under the condition of oxygen-argon volume ratio ...

Embodiment 3

[0058] Catalytic oxidation combined membrane treatment technology is used to remove trace pollutants in tap water. The specific operation method is as follows:

[0059] Such as figure 1 As shown, the tap water is first filtered through sand filter, activated carbon and PP cotton in sequence, and then filtered by catalytic ceramic membrane. After filtering, it enters the sealed water tank for electrocatalytic combined ozone catalytic oxidation treatment. After being filtered by nanofiltration membrane and reverse osmosis filtration membrane respectively, the effluent of nanofiltration membrane and reverse osmosis filtration membrane are mixed according to the ratio of 1:3, and finally enter the water storage tank after being sterilized by ultraviolet light.

[0060] Wherein the sealed water tank contains a pair of electrodes, the anode is the multi-metal Ti composite oxide prepared in embodiment 1, the cathode is the Pt / Ti composite material prepared in embodiment 2, the ozone ...

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Abstract

The invention discloses a method for removing trace pollutants in tap water by a catalytic oxidation combined membrane treatment technology, and belongs to the technical field of water treatment. The invention solves the problem of low removal rate of inorganic micromolecular pollutants in the existing catalytic oxidation technology. A catalytic oxidation combined membrane treatment process is applied, specifically, a catalytic ceramic membrane-nanofiltration-reverse osmosis combined membrane treatment system is used for enhancing the treatment effect of catalytic oxidation on the micropollutants in the tap water, and efficient removal of the micropollutants in the tap water is achieved. The method provided by the invention has the advantages of high ozone generation rate, high ozone content in water and high removal rate of trace pollutants in tap water. The catalytic oxidation combined membrane treatment technology is used for treating tap water containing trace pollutants, and a good effect can also be achieved.

Description

technical field [0001] The invention relates to a method for removing trace pollutants in tap water by catalytic oxidation combined membrane treatment technology, belonging to the technical field of water treatment. Background technique [0002] Existing tap water plants use ozone oxidation technology to treat source water to remove organic pollution in water. However, the current ozone oxidation technology used in water plants has low efficiency, low ozone concentration in water, short residence time, and low efficiency in removing trace organic pollution. Although increasing the dosage of ozone can improve its removal efficiency of trace organic matter, the increase of ozone dosage will increase the generation of disinfection by-products (such as bromate, brominated organic matter, iodo organic matter, etc.). In addition, most of the existing water plants use a single membrane to treat and filter small molecular pollutants in water, which has a low removal rate of trace po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/461C02F101/30
CPCY02A20/131
Inventor 白福良田辉
Owner 首功智能制造(黑龙江)有限公司
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