Ozone-photocatalysis reactor and water treatment method

Patent metadata

Field	Value
Publication number	US-2017369346-A1
Application number	US-201515544460-A
Country	US
Kind code	A1
Filing date	May 12, 2015
Priority date	Jan 19, 2015
Publication date	Dec 28, 2017
Grant date	—

Abstract

An ozone-photocatalysis reactor, comprising: a shell layer ( 1 ); activated carbon layers ( 2 ) arranged in the shell layer ( 1 ); and at least one photoxidation unit arranged in the shell layer ( 1 ) and above the activated carbon layers ( 2 ). The photoxidation unit comprises a honeycomb activated carbon layer I ( 3 ), a light source layer and a honeycomb activated carbon bed layer II ( 4 ) sequentially from bottom to top. A gas inlet ( 7 ) and a water inlet ( 6 ) are formed in the shell layer below the activated carbon layers ( 2 ); a water outlet ( 9 ) and a gas outlet ( 10 ) are formed in the shell layer ( 1 ) above the photoxidation unit; and the activated carbon layers ( 2 ), at least one honeycomb activated carbon bed layer I ( 3 ) and at least one honeycomb activated carbon bed layer II ( 4 ) are loaded with a solid catalyst. The reactor uses ozone oxidation and ozone-photocatalysis sufficiently for sewage treatment, the treatment time is short, and the treatment efficiency is high.

First claim

1 . An ozone-photocatalysis reactor, wherein the reactor comprises:
(i) a shell layer; (ii) an activated carbon layer arranged inside the shell layer; and (iii) at least one photoxidation unit arranged inside the shell layer and above the activated carbon layer; and the photoxidation unit comprises a honeycomb activated carbon bed layer I, a light source layer and a honeycomb activated carbon bed layer II sequentially arranged from bottom to top; wherein a gas inlet and a water inlet are arranged on the shell layer below the activated carbon layer; and a water outlet and a gas outlet are arranged on the shell layer above the photoxidation unit; the activated carbon layer is loaded with a solid catalyst; and the honeycomb activated carbon bed layer I and the honeycomb activated carbon bed layer II are loaded with a solid photocatalyst.

2 . The reactor according to claim 1 , wherein light transmittance of the honeycomb activated carbon bed layer I and the honeycomb activated carbon bed layer II is set to satisfy a predetermined percentage.

3 . The reactor according to claim 1 , wherein the activated carbon layer is any one of a honeycomb activated carbon bed, honeycomb ceramic or granular activated carbon.

4 . The reactor according to claim 1 , wherein the light source layer is a light source capable of emitting visible light and/or ultraviolet light.

5 . The reactor according to claim 1 , wherein the solid photocatalyst is TiO 2 and/or metal doped TiO 2 .

6 . The reactor according to claim 1 , wherein thickness of the activated carbon layer accounts for 20%-95% of the sum of the height of the activated carbon layer and the photooxidation unit.

7 . The reactor according to claim 1 , wherein when the activated carbon layer is a honeycomb activated carbon bed, the honeycomb activated carbon bed is arranged in a staggered manner.

8 . The reactor according to claim 1 , wherein a gas distributor is also arranged inside the shell layer, below the activated carbon layer, and above the gas inlet.

9 . The reactor according to claim 1 , wherein the reactor is disposed sequentially from bottom to top with:
an activated carbon layer which is a honeycomb activated carbon bed having a square hole aperture less than or equal to 0.5 cm and loaded with a solid catalyst having a content no more than 0.5%; a honeycomb activated carbon bed layer I having a thickness of 5-20 cm, the honeycomb activated carbon bed layer I has a square hole aperture of 0.5-1 cm and is loaded with 2-10% of the solid catalyst ; an ultraviolet light source layer composed of horizontally arranged cylindrical ultraviolet light tubes covered with transparent quartz tubes, the intensity of the emitting light of the ultraviolet light tube is 10-1000 mW/cm 2 ; a honeycomb activated carbon bed layer II having a thickness of 5-20 cm, the honeycomb activated carbon bed layer II has a square hole aperture of 0.5-1 cm and is loaded with 5-20% of the solid catalyst; the reactor is disposed with a gas inlet and a water inlet below the activated carbon layer, and a water outlet and a gas outlet are disposed above the honeycomb activated carbon bed layer II of the reactor; the distance of the honeycomb activated carbon bed layer I and the honeycomb activated carbon bed layer II from the ultraviolet light source layer is independently selected from 5-30 cm.

10 . The reactor according to claim 2 , wherein content of the solid catalyst loaded on the activated carbon layer, the honeycomb activated carbon bed layer I and the honeycomb activated carbon bed layer II arranged in the shell layer is increased sequentially from bottom to top.

11 . The reactor according to claim 3 , wherein the activated carbon layer is a water-resistant honeycomb activated carbon bed;
and both of the honeycomb activated carbon bed layer I and the honeycomb activated carbon bed layer II are water-resistant honeycomb activated carbon beds.

12 . The reactor according to claim 11 wherein, the honeycomb activated carbon bed has square holes.

13 . The reactor according to claim 12 , wherein aperture of the square hole in the honeycomb activated carbon bed of the activated carbon layer is less than or equal to 0.5 cm; and
aperture of the square hole in the honeycomb activated carbon bed layer I and the honeycomb activated carbon bed layer II is independently selected from 0.5-1 cm.

14 . The reactor according to claim 4 , wherein the light source of the light source layer is covered with a quartz protective cover.

15 . The reactor according to claim 5 , wherein the metal for doping is any one or a combination of at least two selected from the group consisting of Ni, Fe, Cu, and Mn.

16 . The reactor according to claim 5 , wherein the solid catalyst is selected from a solid ozonation catalyst.

17 . The reactor according to claim 16 , wherein the solid catalyst is selected from a transition metal oxide catalyst for ozonation

18 . The reactor according to claim 17 , wherein the solid catalyst is selected from any one or a combination of at least two of TiO 2 catalyst, CuO catalyst, MnO 2 catalyst, NiO catalyst or Fe 2 O 3 catalyst.

19 . The reactor according to claim 5 , wherein the content of the solid catalyst loaded on the activated carbon layer is less than or equal to 5%.

20 . The reactor according to claim 5 , wherein when the reactor contains only one photooxidation unit, content of the solid photocatalyst loaded on the honeycomb activated carbon bed layer I is 2-10%; and the content of the solid photocatalyst loaded on the honeycomb activated carbon bed layer II is 5-20%.

Assignees

• Inst Process Eng Cas

Inventors

• Xie Yongbing
• Cao Hongbin
• Sheng Yuxing
• Li Yuping

Classifications

• C02F1/325

  Irradiation devices or lamp constructions · CPC title

• C02F1/283

  using coal, charred products, or inorganic mixtures containing them · CPC title

• C02F1/725 Primary

  by catalytic oxidation · CPC title

• C02F2101/30

  Organic compounds · CPC title

• C02F2305/10

  Photocatalysts · CPC title