CN110803757A - Integrated ozone catalytic oxidation tower - Google Patents

Abstract

The invention belongs to the technical field of wastewater treatment, in particular to an integrated ozone catalytic oxidation tower. The oxidation tower includes a tower body, a spiral tube arranged in the tower body, and two catalyst screens arranged in the tower body at intervals along the height direction of the tower body; zone, fixed-bed reaction zone and water storage zone. The fixed-bed reaction zone is used to fill granular oxidation catalysts, and the rotating-bed reaction zone is provided with coaxially linked booster paddles and rotating paddles; the spiral tubes are distributed in the rotating-bed reaction zone, The fixed bed reaction area and the water storage area; the water inlet of the spiral tube is connected with the ozone inlet and the sewage inlet, and the water inlet is located in the water storage area, and the water outlet of the spiral tube is located in the rotating bed reaction area. The oxidation tower can reduce the demand for power support, reduce operation and maintenance costs and simplify operations, and can greatly improve the biodegradability and organic matter removal rate of treated sewage, and reduce the difficulty of subsequent reprocessing.

Description

An integrated ozone catalytic oxidation tower

technical field

The invention belongs to the technical field of wastewater treatment, and particularly relates to an integrated ozone catalytic oxidation tower.

Background technique

The per capita availability of water resources in China is very low, and with population growth, regional economic development, industrialization and urbanization accelerating, the urban water demand continues to grow, which will make the water supply shortage and water shortage more serious. Industrial production requires a large amount of water, and also produces a large amount of industrial sewage. If it cannot be effectively treated, it will further aggravate the problem of water shortage.

Industrial sewage generally has high chemical oxygen demand (COD), dark color, large odor and poor biodegradability, which makes industrial sewage more difficult to treat, and the treated sewage still has low biodegradability, which increases the difficulty of subsequent reprocessing. With the improvement of my country's sewage discharge standards, many sewage treatment facilities cannot meet the new discharge standards, so the advanced treatment of sewage has formed a trend, and ozone oxidation treatment is the most efficient and widely used in advanced treatment. The existing water treatment equipment has a complex structure and needs multiple power supports, which increases the operation and maintenance cost and makes the operation cumbersome.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an integrated ozone catalytic oxidation tower, which aims to solve the problems that the current sewage treatment equipment needs a variety of power supports, the utilization rate of ozone is low, and the biodegradability of the treated sewage is low, and the power support can be reduced. Therefore, it can reduce the operation and maintenance costs and simplify the operation. At the same time, it can also greatly improve the biodegradability of the treated sewage, reduce the difficulty of subsequent reprocessing, and improve the depth of sewage terminal treatment.

In order to achieve the above purpose, the technical scheme adopted in the present invention is to provide an integrated ozone catalytic oxidation tower, comprising a tower body, a spiral tube arranged in the tower body, and two spaced apart along the height direction of the tower body. The catalyst screen in the tower body; the two catalyst screens divide the tower body cavity from bottom to top into a swirling bed reaction zone, a fixed bed reaction zone and a water storage zone, and the fixed bed reaction zone is used for filling Granular oxidation catalyst, the rotating bed reaction zone is provided with coaxially linked booster paddles and rotating paddles; the spiral tubes are distributed in the rotating bed reaction zone, the fixed bed reaction zone and the water storage zone The water inlet of the spiral tube is connected with the ozone inlet and the sewage inlet, and the water inlet of the spiral tube is located in the water storage area, and the water outlet of the spiral tube is located in the swirling bed reaction area.

Further, the swirling bed reaction zone is provided with a swirling bed feed port; the fixed bed reaction zone is provided with a fixed bed discharge port.

Further, a sewage pump is connected to the water inlet of the spiral pipe.

Further, the helical tube is arranged in contact with the inner wall of the tower.

Further, the tower body is provided with an air outlet pipe communicating with the water storage area, and the air outlet pipe is connected with a reoxidation tank.

Further, the water storage area is provided with a water conduit, the water inlet of the water conduit is arranged at the bottom of the water storage area, and the water outlet of the water conduit communicates with the water inlet of the reoxidation tank.

Further, a water distributor is provided above the catalyst barrier between the fixed bed reaction zone and the swirling bed reaction zone.

Further, the bottom surface of the lower catalyst screen is provided with a support frame located in the rotating bed reaction zone, and the booster paddle and the rotating paddle are respectively rotatably arranged on the support frame.

Further, the booster paddle includes a first rotating sleeve rotatably connected to the support frame, and a plurality of first paddles that are respectively connected to the first rotating sleeve and distributed at intervals along the circumferential direction of the first rotating sleeve The first paddle is inclined from bottom to top along the water outlet direction of the helical tube, and the angle between the outer edge plane of the first paddle and the horizontal plane is 90 to 100°; the front end of the first paddle The outer diameter of the semicircular shell structure is 1.2-1.5 times the inner diameter of the spiral tube, and the semicircular shell structure protrudes in a direction consistent with the water outlet direction of the spiral tube.

Further, the rotating paddle includes a second rotating sleeve, and a plurality of second paddles respectively connected to the second rotating sleeve and distributed at intervals along the circumferential direction of the second rotating sleeve. It is inclined from top to bottom along the water outlet direction of the helical pipe, and the included angle between the outer edge plane of the second paddle and the horizontal plane is 30° to 45°.

The beneficial effect of the integrated ozone catalytic oxidation tower provided by the present invention is that in the integrated ozone catalytic oxidation tower provided by the present invention, ozone and sewage are fully contacted, mixed and reacted in the narrow space in the spiral tube, so that the strong oxidizing Ozone oxidizes the organic matter in the sewage to initially reduce the COD of the sewage; an appropriate amount of catalyst can be placed in the swirling bed reaction zone, and the sewage flowing out of the spiral tube still has a certain inertial force, which can continue to rotate and flow and generate an impact force to propel the propeller. It rotates, and the coaxially linked rotary paddle is driven by the booster paddle to rotate, which makes the sewage and the catalyst in the rotating bed reaction area rotate along with it, so that the three-phase collision and contact of ozone, sewage and catalyst in this area can realize efficient mass transfer, Heat transfer and oxidation reaction occur, so that the organic matter in the water is continuously oxidized, so the COD is reduced again; the sewage passes through the catalyst screen from the rotating bed reaction zone into the fixed bed reaction zone, and the ozone in the sewage flows from the bottom to the top in the fixed bed reaction zone. The oxidized catalyst contacts the ozone and the organic matter in the sewage to continue the oxidation reaction, further reducing the COD in the water, and the treated water enters the water storage area, which can be directly discharged or utilized through the reoxidation tank, or further processed, such as Biochemical treatment. The catalyst screen between the fixed bed reaction zone and the swirling bed reaction zone prevents the particulate oxidation catalyst packed in the fixed bed reaction zone from falling into the swirling bed reaction zone and prevents the catalyst in the swirling bed reaction zone from entering the fixed bed reaction The catalyst screen between the fixed-bed reaction zone and the water storage zone is used to prevent the granular oxidation catalyst packed in the fixed-bed reaction zone from drifting away with the water flow. The oxidation tower has small power requirements, low operation and maintenance costs and easy operation; ozone is used as an oxidant, and the comprehensive utilization of ozone in the oxidation tower is high, which can reduce the cost of ozone and secondary pollution; after the sewage is treated by the oxidation tower The biodegradability is greatly improved, which reduces the difficulty of subsequent reprocessing.

Description of drawings

Fig. 1 is the sectional schematic diagram of the integrated ozone catalytic oxidation tower in the embodiment of the present invention;

2 is a schematic cross-sectional view of a reoxidation tank in an embodiment of the present invention.

In the picture:

1. Tower body;

2. Spiral pipe; 21, water inlet; 211, ozone inlet; 212, sewage inlet; 22, water outlet;

31. The lower catalyst is blocked; 32. The upper catalyst is blocked;

4. Rotating bed reaction zone;

41, booster paddle; 411, first rotating sleeve; 412, first paddle;

42, rotating paddle; 421, second rotating sleeve; 422, second paddle;

43, support frame; 431, support rod; 432, fixed rod;

44. Feeding port of rotary bed

5. Fixed bed reaction zone; 51. Fixed bed discharge port;

6. Water storage area; 61. Outlet pipe; 62; Aqueduct;

7. Water distributor;

8. Reoxidation pool.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Please refer to FIG. 1 and FIG. 2 together, and now the integrated ozone catalytic oxidation tower provided by the present invention will be described. The oxidation tower includes a tower body 1, a spiral tube 2 arranged in the tower body 1, and two catalyst screens (ie, the upper catalyst screen 32 and the lower catalyst screen 31) spaced in the tower body 1 along the height direction of the tower body 1. ), the upper catalyst barrier 31 and the next catalyst barrier 32 divide the inner cavity of the tower body 1 into a swirling bed reaction zone 4, a fixed bed reaction zone 5 and a water storage zone 6 from bottom to top, and the fixed bed reaction zone 5 is used for filling particles The rotating bed reaction zone 4 is provided with a coaxially linked booster paddle 41 and a rotating paddle 42; the spiral tube 2 is distributed in the rotating bed reaction zone 4, the fixed bed reaction zone 5 and the water storage zone 6; the spiral tube The water inlet 21 of 2 is connected with the ozone inlet 211 and the sewage inlet 212, and the water inlet 21 of the spiral tube 2 is located in the water storage area 6, and the water outlet 22 of the spiral tube 2 is located in the rotating bed reaction area 4.

The beneficial effect of the integrated ozone catalytic oxidation tower provided by the present invention is that in the integrated ozone catalytic oxidation tower provided by the present invention, ozone and sewage are fully contacted, mixed and reacted in the narrow space in the spiral tube 2, so that the strong oxidation The organic matter in the sewage can be oxidized by ozone, and the COD of the sewage can be preliminarily reduced; an appropriate amount of catalyst can be placed in the rotating bed reaction zone 4, and the sewage flowing out from the spiral pipe 2 still has a certain inertial force, which can continue to rotate and flow and generate impact force , push the booster paddle 41 to rotate, and the booster paddle 41 drives the coaxially linked rotating paddle 42 to rotate, so that the sewage and the catalyst in the swirling bed reaction zone 4 rotate along with it, thereby making the three-phase ozone, sewage and catalyst in this area. Collision contact realizes efficient mass transfer, heat transfer and oxidation reaction, so that the organic matter in the water is continuously oxidized, so that the COD is reduced again; the sewage passes through the catalyst screen 3 from the rotating bed reaction zone 4 into the fixed bed reaction zone 5. The ozone contacts the oxidation catalyst in the fixed bed reaction zone 5 from bottom to top, so that the ozone and the organic matter in the sewage continue to undergo oxidation reaction, further reducing the COD in the water, and the treated water enters the water storage zone 6, which can be used for The next step, such as biochemical treatment. The lower catalyst barrier 31 between the fixed bed reaction zone 5 and the swirling bed reaction zone 4 can prevent the granular oxidation catalyst filled in the fixed bed reaction zone 5 from falling into the swirling bed reaction zone 4 and prevent the swirling bed reaction zone 4 The catalyst in the fixed bed reaction zone 5 enters the fixed bed reaction zone 5, and the upper catalyst screen 32 between the fixed bed reaction zone 5 and the water storage zone 6 is used to prevent the granular oxidation catalyst filled in the fixed bed reaction zone 5 from drifting away with the water flow. The oxidation tower has small power requirements, low operation and maintenance costs and easy operation; ozone is used as an oxidant, and the comprehensive utilization of ozone in the oxidation tower is high, which can reduce the cost of raw materials and secondary pollution; after the sewage is treated by the oxidation tower The biodegradability is greatly improved, which reduces the difficulty of subsequent reprocessing.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the rotating bed reaction zone 4 is provided with a rotating bed feeding port 44, and the fixed bed reaction zone 5 is provided with a fixed bed discharging port 51, which is convenient for local maintenance. maintenance, and removal of the catalyst.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the top of the tower body 1 is provided with a detachable upper head connected by a flange, and the upper catalyst screen 32 is detachable, so that it is convenient for the fixed bed reaction zone 5 Carry out loading.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, a sewage pump (not shown) is connected to the water inlet 21 of the spiral pipe 2 to provide power for the flow of sewage. When the sewage pump is not used, the sewage source can also be set at a position higher than the oxidation tower, and the gravity action is used to promote the flow of the sewage.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the spiral tube 2 is arranged to fit the inner wall of the tower body 1, so that the sewage flowing out of the spiral tube 2 has a faster flow rate, and has a greater impact on the booster paddle 41. impact force.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the tower body 1 is provided with an outlet pipe 61 that communicates with the water storage area 6 for exporting the remaining ozone and the gas generated by the reaction, so as to collect ozone or further use. The air outlet pipe 61 is connected with a re-oxidation tank 8 (as shown in FIG. 2 ), which is used to further utilize the remaining ozone after exiting the tower, fully exert the oxidizing ability of the remaining ozone, and improve the utilization rate of ozone.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the water storage area 6 is provided with a water conduit 62, the water inlet of the water conduit 62 is arranged at the bottom of the water storage area 6, and the water outlet 22 of the water conduit 62 is connected to The water inlet of the oxidation tank 8 (as shown in FIG. 2 ) allows the remaining ozone in the reaction to re-oxidize the water treated by the oxidation tower to further ensure the quality of the effluent.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, a water distributor 7 is provided above the catalyst screen 3 between the fixed bed reaction zone 5 and the rotating bed reaction zone 4, so that the rotating bed reaction zone 4 The water entering the fixed-bed reaction zone 5 is evenly distributed to avoid the influence of the rotating water flow in the rotating-bed reaction zone 4 on the reaction in the fixed-bed reaction zone 5 .

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the bottom surface of the catalyst screen 31 is provided with a support frame 43 located in the rotating bed reaction zone 4, and the booster paddle 41 and the rotary paddle 42 are respectively rotatably arranged on the support frame 43 on. As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the support frame 43 includes three support rods 431 and one fixing rod 432 , and the three support rods 431 can make the fixing rod 432 stably fixed on the surface of the catalyst screen 31 . on the underside.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the booster paddle 41 includes a first rotating sleeve 411 rotatably connected to the support frame 43 , and a plurality of rotating sleeves 411 respectively connected to the first rotating sleeve 411 and rotating along the first rotating sleeve 411 . The first paddles 412 distributed at intervals in the circumferential direction of the sleeve 411, the first paddles 412 are inclined from bottom to top along the water outlet direction of the helical tube 2, and the angle between the outer edge plane of the first paddle 412 and the horizontal plane is 90-100° The front end of the first paddle 412 is a semicircular shell structure, the outer diameter of the semicircular shell structure is 1.2 to 1.5 times the inner diameter of the spiral tube 2, and the semicircular shell structure protrudes in the direction consistent with the water outlet direction of the spiral tube 2, which is beneficial to The water outlet of the spiral tube 2 directly acts on the paddle surface of the booster paddle 41, and the power loss is small and the rotational resistance is small.

As a specific embodiment provided by the integrated ozone catalytic oxidation tower of the present invention, the rotating paddle 42 includes a second rotating sleeve 421 , and a plurality of them are respectively connected to the second rotating sleeve 421 and distributed along the circumferential direction of the second rotating sleeve 421 at intervals. The second paddle 422 is inclined from top to bottom along the water outlet direction of the helical tube 2, and the angle between the outer edge plane of the second paddle 422 and the horizontal plane is 30-45°, which can promote the rotation The water flow in the bed reaction zone 4 will not generate excessive vortex.

The operational process adopted by the present invention to solve its technical problems is:

A. The sewage to be treated is pumped into the water inlet 21 of the spiral tube 2 from the sewage inlet 212 through the sewage pump, and at the same time, the ozone is injected into the water inlet 21 of the spiral tube 2 through the ozone inlet 211, so that ozone and sewage are in the spiral tube 2. mix.

B. After the sewage flows out from the spiral pipe 2, its impact force promotes the rotation of the booster paddle 41, the booster paddle 41 drives the rotary paddle 42 to rotate, and causes the sewage and the catalyst in the gyratory bed reaction zone 4 to rotate along with it, so that the ozone, Efficient oxidation reaction takes place in the swirling bed reaction zone 4 for the sewage and the catalyst.

C, along with the increase of the sewage in the swirling bed reaction zone 4, the sewage in the swirling bed reaction zone 4 enters the fixed bed reaction zone 5 through the lower catalyst screen 31 and the water distributor 7, and in the fixed bed reaction zone 5 by means of The oxidation catalyst makes the ozone and the organic matter in the sewage continue to oxidize, and further reduces the COD in the water. The treated water enters the water storage area 6 through the upper catalyst screen 32 between the fixed bed reaction area 5 and the water storage area 6 , and is then led out by the water conduit 62 . From the time the sewage enters the tower to the end of the sewage exiting the tower, the water conservancy residence time of the sewage in the entire tower equipment is controlled within 0.5-2.5h.

D. The water conduit 62 of the water storage area 6 introduces the treated water into the re-oxidation tank 8, and at the same time, the air outlet 61 also introduces the remaining ozone into the re-oxidation tank 8, so that the ozone and the remaining oxides in the water are re-oxidized reaction, improve the comprehensive utilization rate of ozone, and ensure the quality of effluent.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. an integrated ozone catalytic oxidation tower, is characterized in that: comprise tower body, be arranged in the helical tube in described tower body, and two catalyzer screens that are arranged in described tower body at intervals along the height direction of described tower body The two described catalyst screens divide the inner cavity of the tower into a rotating bed reaction zone, a fixed bed reaction zone and a water storage zone from bottom to top, and the fixed bed reaction zone is used to fill the granular oxidation catalyst, and the rotating The moving bed reaction zone is provided with coaxially linked booster paddles and rotating paddles; the spiral tubes are distributed in the moving bed reaction zone, the fixed bed reaction zone and the water storage zone; the feeding of the spiral tubes The water inlet is connected with the ozone inlet and the sewage inlet, the water inlet of the spiral tube is located in the water storage area, and the water outlet of the spiral tube is located in the swirling bed reaction area. 2 . The integrated ozone catalytic oxidation tower according to claim 1 , wherein: the swirling bed reaction zone is provided with a swirling bed feed port; the fixed bed reaction zone is provided with a fixed bed discharge port. 3 . 3. The integrated ozone catalytic oxidation tower according to claim 1, wherein a sewage pump is connected to the water inlet of the spiral pipe. 4 . The integrated ozone catalytic oxidation tower according to claim 1 , wherein the helical tube is arranged to fit the inner wall of the tower. 5 . 5 . The integrated ozone catalytic oxidation tower according to claim 1 , wherein the tower body is provided with an air outlet pipe communicating with the water storage area, and the air outlet pipe is connected with a reoxidation tank. 6 . 6. The integrated ozone catalytic oxidation tower according to claim 5, wherein the water storage area is provided with a water conduit, the water inlet of the water conduit is arranged at the bottom of the water storage area, and the water conduit The water outlet of the water pipe is connected to the water inlet of the reoxidation tank. 7 . The integrated ozone catalytic oxidation tower according to claim 1 , wherein a water distributor is provided above the catalyst barrier between the fixed-bed reaction zone and the swirling-bed reaction zone. 8 . 8. The integrated ozone catalytic oxidation tower according to claim 1, characterized in that: the bottom surface of the catalyst block in the lower layer is provided with a support frame located in the rotating bed reaction zone, the booster paddle and the rotating The paddles are respectively rotatably arranged on the support frame. 9 . The integrated ozone catalytic oxidation tower according to claim 8 , wherein the booster paddle comprises a first rotating sleeve rotatably connected to the support frame, and a plurality of rotating sleeves are respectively connected to the first rotating sleeve. 10 . The first paddles are distributed at intervals along the circumferential direction of the first rotating sleeve, the first paddles are inclined from bottom to top along the water outlet direction of the helical tube, and the outer edge plane of the first paddle The included angle of the horizontal plane is 90-100°; the front end of the first paddle is a semi-circular shell structure, the outer diameter of the semi-circular shell structure is 1.2-1.5 times the inner diameter of the spiral tube, and the semi-circular shell structure is oriented to the The direction of the water outlet of the spiral pipe is the same as that of the protruding direction. 10 . The integrated ozone catalytic oxidation tower according to claim 8 , wherein the rotating paddle comprises a second rotating sleeve, and a plurality of them are respectively connected to the second rotating sleeve and extend along the second rotating sleeve. 11 . The second paddles are distributed at intervals in the circumferential direction, the second paddles are inclined from top to bottom along the water outlet direction of the helical tube, and the angle between the outer edge plane of the second paddle and the horizontal plane is 30-45 °.

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