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Method for removing trace micromolecular organic matters in reclaimed water

A technology of reclaimed water and small molecules, applied in water pollutants, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as removal rate and complex process that easily cause other problems, achieve effective removal, simple process, and overcome generation low volume effect

Active Publication Date: 2021-12-31
CHINA ELECTRONICS INNOVATION ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing treatment methods for trace amounts of small molecular organics in reclaimed water have the problems of complex process, easy to cause other problems and low removal rate

Method used

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  • Method for removing trace micromolecular organic matters in reclaimed water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The regenerated water obtained after UF+RO treatment is added with an oxidant and then passed into the ultraviolet oxidation device. The ultraviolet lamp is installed in the ultraviolet oxidation device, and the regenerated water with the oxidant is irradiated through the ultraviolet lamp. The oxidant includes the following mass fractions: Divide: 6.0% hydrogen peroxide, 42.0% peroxodisulfate, 2.0% chloramine and 50.0% water.

[0017] The concentration of urea in reclaimed water is 123ppb;

[0018] The addition amount of oxidizing agent is Y=5.1ln(123)+2.9=27.4ppm, gets 30ppm (30ppm refers to the total concentration of three active components-hydrogen peroxide, peroxodisulfate and chloramine in oxidizing agent);

[0019] The hydraulic retention time in the UV oxidation device is 120s;

[0020] The irradiation dose is Z=3.4(123) 0.8 =159.7mJ / cm 2 , take 160mJ / cm 2 ;

[0021] After testing, the TOC concentration of the product water was 16.8ppb.

[0022] Pass the pr...

Embodiment 2

[0024] The regenerated water obtained after UF+RO treatment is added with an oxidant and then passed into the ultraviolet oxidation device. The ultraviolet lamp is installed in the ultraviolet oxidation device, and the regenerated water with the oxidant is irradiated through the ultraviolet lamp. The oxidant includes the following mass fractions: Divide: 6.0% hydrogen peroxide, 42.0% peroxodisulfate, 2.0% chloramine and 50.0% water.

[0025] The concentration of urea in reclaimed water is 83ppb;

[0026] The addition of oxidizing agent is Y=5.1ln(83)+2.9=25.4ppm, gets 25ppm;

[0027] The hydraulic retention time in the UV oxidation device is 120s;

[0028] The irradiation dose is Z=3.4(83) 0.8 =116.6mJ / cm 2 , take 119mJ / cm 2 ;

[0029] After testing, the TOC concentration of the product water was 10.9ppb.

[0030] Pass the product water into the resin column. After testing, the TOC concentration of the resin column effluent is 3.7ppb, and the urea concentration is 13ppb;...

Embodiment 3

[0032] The regenerated water obtained after UF+RO treatment is added with an oxidant and then passed into the ultraviolet oxidation device. The ultraviolet lamp is installed in the ultraviolet oxidation device, and the regenerated water with the oxidant is irradiated through the ultraviolet lamp. The oxidant includes the following mass fractions: Divide: 6.0% hydrogen peroxide, 42.0% peroxodisulfate, 2.0% chloramine and 50.0% water.

[0033] The concentration of urea in reclaimed water is 68ppb;

[0034] The addition of oxidizing agent is Y=5.1ln(68)+2.9=24.4ppm, gets 25ppm;

[0035] The hydraulic retention time in the UV oxidation device is 120s;

[0036] The irradiation dose is Z=3.4(68) 0.8 =99.4mJ / cm 2 , take 100mJ / cm 2 ;

[0037] After testing, the TOC concentration of the product water was 9.7ppb.

[0038] Pass the product water into the resin column. After testing, the TOC concentration of the resin column effluent is 2.9ppb, and the urea concentration is 8ppb; th...

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Abstract

The invention discloses a method for removing trace small molecular organic matters in reclaimed water, which comprises the following steps: introducing reverse osmosis reclaimed water added with an oxidizing agent into an ultraviolet oxidation device, and carrying out redox reaction on the oxidizing agent and the trace small molecular organic matters in the reclaimed water under the irradiation of ultraviolet light; wherein the oxidizing agent is prepared from the following components in percentage by mass: 6.0 percent to 7.0 percent of hydrogen peroxide, 40.0 percent to 42.0 percent of peroxydisulfate, 2.0 percent to 3.0 percent of chloramine and 48.0 percent to 50.0 percent of water. The removal method provided by the invention is simple in process, can effectively remove trace urea in the reclaimed water, and can reduce the urea concentration in the produced water to 5ppb for the reclaimed water with the initial urea concentration of 60ppb-125ppb, so that the reclaimed water can be reused for preparing the electronic ultrapure water.

Description

technical field [0001] The invention relates to a method for removing trace small molecule organic matter in regenerated water. Background technique [0002] The existing industrial wastewater / sewage plant tail water regeneration treatment process is mainly a combination of ultrafiltration (UF) and reverse osmosis (RO), which can effectively remove most of the total organic carbon (TOC) and total dissolved solids in the wastewater (TDS) and other pollutants, so as to produce higher quality reclaimed water. The TOC concentration of regenerated water treated by UF+RO is very low (generally TOC<1mg / L). Reclaimed water can be used for general industrial production, agricultural irrigation, urban landscape, and groundwater replenishment, etc., but for electronics / new energy industries such as integrated circuits, flat panel displays, and new energy that have high requirements for raw water production, recycled water cannot be directly reused. The main reason for the preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/34C02F101/38
CPCC02F9/00C02F1/32C02F1/722C02F1/76C02F1/72C02F1/725C02F1/001C02F1/42C02F2001/425C02F2001/422C02F2101/38C02F2101/34
Inventor 熊江磊陈炜彧蒋士龙周伟袁润博
Owner CHINA ELECTRONICS INNOVATION ENVIRONMENTAL TECH CO LTD
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