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Method for purifying water in depth by using ozone photocatalysis biological activity carbon

A technology of biological activated carbon and photocatalysis, applied in the field of water treatment, can solve the problems of high cost and low efficiency, and achieve the effect of reducing treatment cost, good treatment effect and low treatment cost.

Inactive Publication Date: 2003-10-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low efficiency and high cost of photocatalytic removal of organic pollutants in water in the prior art, and to provide a more economical and effective method for removing pollutants in water, especially trace organic matter

Method used

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  • Method for purifying water in depth by using ozone photocatalysis biological activity carbon
  • Method for purifying water in depth by using ozone photocatalysis biological activity carbon

Examples

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Effect test

Embodiment 1

[0017] Example 1: Ozone Photocatalysis—Biological Activated Carbon Method for Purifying Reservoir Water

[0018] Such as figure 1 As shown, the reservoir water enters from the lower part of the ozone photocatalytic reactor 100, and the center of the reactor is placed with an ultraviolet lamp 102 covered with a quartz sleeve 103, and the photocatalyst 101 coated on the inner wall of the reactor is titanium dioxide. Ozone gas is passed into from the bottom of described reactor, and ozone dosage is 3mg / L, and described ozone gas passes through the air distributor plate 104 in described reactor and water is uniformly mixed; Water and ozone gas are in described reactor The residence time is between 16min, and the organic pollutants in the water are removed or converted; the water after preliminary treatment flows out from the upper water outlet 106 of the reactor, and the ozone tail gas is discharged from the gas discharge port 105 of the reactor;

[0019] The water through the ab...

Embodiment 2

[0024] Example 2: Ozone photocatalysis—biological activated carbon method to purify secondary effluent of urban sewage treatment plant.

[0025] Equally, adopt the ozone photocatalysis-biological activated carbon method of the present invention to purify the secondary effluent of urban sewage treatment plant, wherein the residence time of the water to be treated in the ozone photocatalytic unit is 16min, and the residence time in the biological activated carbon unit is 15min . When the ozone dosage of the ozone photocatalytic unit is 3mg / L and 6mg / L respectively, the removal effect of pollutants in water is shown in Table 2.

[0026] When the ozone dosage was 3mg / L, the ozone photocatalytic method (O 3 / TiO 2 / UV) on total organic carbon (TOC) and permanganate index (COD Mn ) removal rate has only 27.5% and 32.6%, and the ozone photocatalysis of the present invention-biological activated carbon method (O 3 / TiO 2 / LUV+BAC) were 51.4% and 61.5% respectively, and the removal...

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Abstract

An ozone photocatalysis-biologic activated method for deeply cleaning water features use of an ozone photocatalytic unit and a biologic activated carbon unit, and includes introducing the water to betreated and ozone to the ozone photocatalysis reactor containing ultraviolet lamp and photocatalyst, mixing, staying for 1-20 min, flowing in biologic activated carbon reactor, and staying for 10-80 min to degradate and remove organic pollutant. Its advantage is high effect.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a method for removing pollutants in water, in particular to a deep purification method for water polluted by trace organic matter. Background technique [0002] Photocatalytic technology uses ultraviolet light to irradiate photocatalytically active semiconductor catalysts, such as titanium dioxide (TiO 2 ), zinc oxide (ZnO), tungsten trioxide (WO 3 ), etc., the valence band electrons of semiconductor catalysts are excited by ultraviolet light and jump to the conduction band, an electron with strong reducing ability is generated in the conduction band, and a strong oxidizing hole appears in the valence band. The hydroxyl radicals formed by the holes generated by the semiconductor excited by ultraviolet light and migrated to the surface of the semiconductor and captured by water or hydroxyl groups have a strong oxidizing ability, which can oxidize and mineralize most organic ...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCY02W10/37
Inventor 张彭义祝万鹏李来胜余刚蒋展鹏韩文亚简丽
Owner TSINGHUA UNIV
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