CN111943348A - Sewage ozone catalytic oxidation treatment system and method - Google Patents
Sewage ozone catalytic oxidation treatment system and method Download PDFInfo
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- CN111943348A CN111943348A CN202010880072.5A CN202010880072A CN111943348A CN 111943348 A CN111943348 A CN 111943348A CN 202010880072 A CN202010880072 A CN 202010880072A CN 111943348 A CN111943348 A CN 111943348A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
Abstract
The invention provides a sewage ozone catalytic oxidation treatment system which comprises a water inlet unit, an ozone catalytic oxidation unit, a water outlet unit and a tail gas treatment unit, wherein a water collecting area, an ozone catalytic oxidation area and a water and gas distributing area are sequentially arranged in the ozone catalytic oxidation unit from top to bottom. The invention further provides a gas-liquid downstream treatment method, a gas-liquid countercurrent treatment method and a backwashing method for catalytic oxidation of sewage by ozone. The invention provides a sewage ozone catalytic oxidation treatment system and a method thereof, which realize the full mixing and contact of ozone and sewage by forming a liquid flow downstream passage, a liquid flow upstream passage, an air flow passage and a back flush passage, improve the ozone catalytic oxidation efficiency, fully utilize the ozone, have no secondary pollution, are suitable for sewage ozone catalytic oxidation treatment of various scales, have the characteristics of flexibility, applicability and the like, and can be used for ozone catalytic oxidation pretreatment or advanced treatment of various sewage.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and relates to a sewage ozone catalytic oxidation treatment system and a sewage ozone catalytic oxidation treatment method.
Background
With the increasing strictness of the national environmental protection policy, the sewage discharge standard is increasingly strict. The upgrading and transformation of sewage plants and the near-zero and zero discharge of industrial wastewater become the development trend of the sewage treatment industry. The removal of the refractory organic matters is a main problem in the upgrading and transformation of sewage plants, near-zero and zero discharge of industrial wastewater and the like.
At present, methods for removing refractory organic matters mainly comprise an adsorption method and an advanced oxidation method. The adsorption method is to utilize solid particles with large surface area to adsorb colloid substances and solute in sewage, when water flows through the adsorption method, pollutants in wastewater can be adsorbed onto the particles, and the solid particles are used as adsorption media to adsorb the pollutants so as to realize water purification. However, the adsorption method has the problems of high treatment cost, limited capability of removing part of refractory organic matters and the like, and is usually arranged at the tail end of a sewage treatment system to be used as a guarantee process to ensure that the sewage reaches the standard and is discharged. The advanced oxidation method is a method for removing refractory organic matters in sewage by utilizing the strong oxidation action of hydroxyl radicals, the hydroxyl radicals have no selectivity and can almost oxidize all organic pollutants, and a Fenton oxidation method, an ozone catalytic oxidation method, a photocatalytic oxidation method and the like are commonly used.
The Fenton oxidation method is to oxidize Fe by hydrogen peroxide2+Generate hydroxyl free radical under the catalysis of the catalyst, and further oxidize most organic matters. The Fenton oxidation method usually carries out reaction under an acidic condition, and substances such as sulfuric acid, ferrous sulfate, sodium hydroxide and the like are added, so that the Fenton oxidation method is a common method for removing refractory organic matters. The Fenton oxidation method introduces sulfate radicals, sodium ions and other ions while removing most organic matters, which is unfavorable for desalting sewage, and also generates a large amount of iron mud, thereby increasing the treatment cost of the sludge. The photocatalytic oxidation is under the excitation of lightThe surface of the catalyst generates electron-hole pairs, which then react with oxygen and water in the air or water to generate hydroxyl radicals, so that organic pollutants in the wastewater can be degraded into small molecular substances. Photocatalytic oxidation process often uses O2、O3、H2O2Titanium dioxide is used as an auxiliary oxidant and a catalyst. But the photocatalytic oxidation method has few cases of being applied to sewage treatment in a modeling way. The catalytic ozonation method is a method for generating hydroxyl radicals by utilizing ozone under the action of a catalyst, and has the advantages of good organic pollutant removal effect, no introduction of ions, capability of eliminating ozone from ozone tail gas through a tail gas destruction device so as to avoid secondary pollution and the like.
The Chinese invention patent (CN201910331170.0) introduces an ozone catalytic oxidation sewage treatment device. The device realizes intaking and the mixing of ozone through installing the ejector additional on the inlet tube, intercepts, deposits the suspended solid that ozone catalytic oxidation in-process produced through setting up sedimentation tank and suspended solid baffle, establishes ties in order to increase the ozone utilization ratio through setting up two-stage ozone reaction tank. The device realizes the full mixing of the inlet water and the ozone through the jet device, but the ozone adding amount is limited by the type of the jet device, the ozone adding amount cannot be flexibly adjusted, and the applicability of the device is limited; the suspended matter baffle and the sedimentation tank intercept the suspended matters of the effluent and also intercept the suspended matters washed out in the backwashing process, which is not beneficial to the effluent quality; the device does not have the water distribution device to go out water, the short-term flow easily appears.
Currently designed ozone catalytic oxidation devices are mostly tower-shaped and are difficult to be applied to the treatment of sewage with larger scale.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a catalytic ozonation treatment system and method thereof, which can fully utilize ozone and generate no secondary pollution while fully mixing ozone and sewage; the method is suitable for catalytic ozonation treatment of sewage of various scales, has the characteristics of flexibility, applicability and the like, and can be used for catalytic ozonation pretreatment or advanced treatment of various sewage.
In order to achieve the above and other related objects, a first aspect of the present invention provides a sewage ozone catalytic oxidation treatment system, which includes a water inlet unit, an ozone catalytic oxidation unit, a water outlet unit, and a tail gas treatment unit, wherein the ozone catalytic oxidation unit is internally provided with a water collection region, an ozone catalytic oxidation region, and a water and gas distribution region from top to bottom;
the water inlet unit and/or the water outlet unit are communicated with the water distribution and air distribution area along the water inlet direction, and the water collection area is communicated with the water outlet unit along the water outlet direction to form a liquid flow downstream passage;
the water inlet unit is communicated with the water collecting area along the water inlet direction, and the water distribution and air distribution area is communicated with the water outlet unit along the water outlet direction to form a liquid flow countercurrent passage;
the water outlet unit and/or the water collecting area are/is communicated with the tail gas treatment unit along the gas outlet direction to form a gas flow passage;
the water outlet unit is communicated with the water distribution and gas distribution area along the backwashing water inlet direction to form a backwashing passage.
Preferably, the water inlet unit is a water inlet tank.
Preferably, be linked together through the inlet tube between water inlet unit and the ozone catalytic oxidation unit, the inlet tube is equipped with first water inlet branch pipe, intake pump, second water inlet branch pipe along the direction of intaking in proper order, be equipped with first water intaking valve on the first water inlet branch pipe, be equipped with the second water intaking valve on the second water inlet branch pipe.
More preferably, in the liquid flow concurrent flow passage, a water ejector is arranged on the second water inlet branch pipe, and the water ejector is externally connected with an ozone inlet pipe.
Further preferably, the water ejector is arranged on a second water inlet branch pipe between the water inlet pump and the second water inlet valve.
Preferably, the ozone catalytic oxidation unit is a closed tank body.
Preferably, a water distribution and air distribution pipe is arranged in the water distribution and air distribution area, and the water distribution and air distribution pipe is selected from one of a single water distribution and air distribution pipe or a composite air distribution pipe; in the liquid flow downstream passage, the water distribution and air distribution pipe is a single water distribution and air distribution pipe; in the liquid flow countercurrent passage, the water distribution and air distribution pipe is a composite air distribution pipe.
More preferably, the bottom of the single water and air distributing pipe is provided with a plurality of perforations.
More preferably, one end of the single water distribution and air distribution pipe is communicated with the second water inlet branch pipe, the other end of the single water distribution and air distribution pipe is externally connected with a backwashing air inlet pipe, and the backwashing air inlet pipe is provided with a backwashing air inlet valve and is connected with an air blower.
More preferably, the composite gas distribution pipe comprises a first gas distribution branch pipe and a second gas distribution branch pipe, the first gas distribution branch pipe is externally connected with an ozone inlet pipe, and the ozone inlet pipe is provided with an ozone inlet valve; and the second gas distribution branch pipe is externally connected with a backwashing gas inlet pipe, and the backwashing gas inlet pipe is provided with a backwashing gas inlet valve and is connected with an air blower.
Further preferably, a plurality of ozone gas distribution discs are arranged on the first gas distribution branch pipe, and a plurality of through holes are formed in the bottom of the second gas distribution branch pipe.
Preferably, be equipped with catalyst packing layer, cloth water cloth gas layer, backup pad from top to bottom in the ozone catalytic oxidation region in proper order, be equipped with a plurality of water caps in the backup pad.
More preferably, the height ratio of the catalyst packing layer, the water and gas distribution layer and the support plate is 20-40: 2-4: 1 to 2.
Preferably, a water collecting channel is arranged in the water collecting area.
More preferably, the water collecting channel is communicated with the backwashing wastewater collecting channel, a backwashing wastewater gate is arranged between the water collecting channel and the backwashing wastewater collecting channel, and the backwashing wastewater collecting channel is externally connected with a backwashing wastewater pipe.
More preferably, the water collecting channel communicates with a second water inlet branch pipe in the liquid flow reverse flow path.
Preferably, the water outlet unit is a closed water outlet contact tank.
Preferably, a plurality of galleries are arranged in the water outlet unit.
More preferably, a spacing is maintained between adjacent galleries.
More preferably, in the liquid flow forward flow path, the water outlet unit is communicated with the first water inlet branch pipe through a circulation pipe, the circulation pipe includes a main circulation pipe and a plurality of branch circulation pipes, one end of each branch circulation pipe is communicated with the water outlet unit, the other end of each branch circulation pipe is communicated with the main circulation pipe, the main circulation pipe is further communicated with the first water inlet branch pipe, and the branch circulation pipes are provided with circulation valves.
Preferably, the water outlet unit is communicated with the ozone catalytic oxidation unit through a water outlet pipe, and a water outlet valve is arranged on the water outlet pipe.
More preferably, in the liquid flow downstream passage, the water outlet unit is communicated with a water collecting channel through a water outlet pipe; and in the liquid flow countercurrent passage, the water outlet unit is communicated with the water distribution and air distribution area through a water outlet pipe.
Preferably, the water outlet unit is communicated with the water and gas distribution area through a backwashing water pipe, the backwashing water pipe is sequentially provided with a first backwashing water branch pipe, a backwashing water pump and a second backwashing water branch pipe along a backwashing water inlet direction, the first backwashing water branch pipe is provided with a first backwashing water valve, and the second backwashing water branch pipe is provided with a second backwashing water valve.
Preferably, the tail gas treatment unit is a tail gas destructor.
Preferably, the tail gas treatment unit is communicated with the water outlet unit through a first tail gas collecting pipe, a second tail gas collecting pipe is externally connected to the first tail gas collecting pipe, one end of the second tail gas collecting pipe is communicated with the water collecting area, and the other end of the second tail gas collecting pipe is communicated with the first tail gas collecting pipe.
More preferably, a first tail gas collecting valve is arranged on the first tail gas collecting pipe, and a second tail gas collecting valve is arranged on the second tail gas collecting pipe.
The second aspect of the invention provides a gas-liquid concurrent flow treatment method for sewage ozone catalytic oxidation, which adopts the sewage ozone catalytic oxidation treatment system and comprises the following steps:
1) mixing the inlet water in the water inlet unit and the return water in the water outlet unit, inputting ozone for mixing, inputting the mixture into a water distribution and gas distribution area of the ozone catalytic oxidation unit along the water inlet direction, and accumulating the ozone tail gas and the outlet water containing the ozone tail gas in a water collection area after the mixture is treated by the ozone catalytic oxidation area;
2) inputting the ozone tail gas accumulated in the water collection area obtained in the step 1) into a tail gas treatment unit for decomposition and then discharging the ozone tail gas after reaching the standard;
3) the effluent containing the ozone tail gas obtained in the step 1) is input into a water outlet unit and then is separated into ozone tail gas and effluent, the ozone tail gas is input into a tail gas treatment unit for decomposition and then is discharged after reaching the standard, and the effluent part is used as return water to be mixed with the inlet water in the water inlet unit and then flows back to the ozone catalytic oxidation unit.
Preferably, in the step 1), the inlet water in the water inlet unit is input into the water and air distribution area through a water inlet pipe, the return water in the water outlet unit is input into the water inlet pipe through a circulating pipe, and the ozone is input into the water inlet pipe through an ozone inlet pipe and a water injector.
Preferably, in step 2), the ozone tail gas accumulated in the water collecting area is input into the tail gas treatment unit through a second tail gas collecting pipe.
Preferably, in step 3), the effluent containing the ozone tail gas is input into the effluent unit and then separated into the ozone tail gas and the effluent, and the ozone tail gas and the effluent are treated by a corridor.
Preferably, in the step 3), the outlet water containing the ozone tail gas is input into the water outlet unit through the water outlet pipe, and the ozone tail gas is input into the tail gas treatment unit through the first tail gas collecting pipe.
The third aspect of the invention provides a gas-liquid countercurrent treatment method for sewage ozone catalytic oxidation, which adopts the sewage ozone catalytic oxidation treatment system and comprises the following steps:
A) inputting inlet water in a water inlet unit into a water collecting area of an ozone catalytic oxidation unit, then enabling the inlet water to flow into an ozone catalytic oxidation area from top to bottom, inputting ozone into a water distribution and gas distribution area, then enabling the inlet water to flow into the ozone catalytic oxidation area from bottom to top, and enabling the inlet water and the ozone to be mixed and reacted in the ozone catalytic oxidation area to form ozone tail gas and outlet water containing the ozone tail gas;
B) the ozone tail gas formed in the step A) flows into a water collecting area from bottom to top to be accumulated, and then is input into a tail gas treatment unit to be decomposed and discharged after reaching the standard;
C) and B), after the effluent containing the ozone tail gas formed in the step A) flows into the water distribution and gas distribution area from top to bottom, the effluent is input into a water outlet unit and then is separated into ozone tail gas and effluent, and the ozone tail gas is input into a tail gas treatment unit to be decomposed and then is discharged after reaching the standard.
Preferably, in step a), the inlet water in the inlet unit is input into the collecting channel in the collecting area through the inlet pipe.
Preferably, in the step a), the ozone is sequentially input into the water and gas distribution area through the ozone inlet pipe and the first gas distribution branch pipe.
Preferably, in step B), the ozone off-gas accumulated in the water collecting area is input into the off-gas treatment unit through a second off-gas collecting pipe.
Preferably, in step C), the effluent containing the ozone tail gas is input into the effluent unit and then separated into the ozone tail gas and the effluent, and the ozone tail gas and the effluent are treated by the corridor.
Preferably, in the step C), the outlet water containing the ozone tail gas is input into the water outlet unit through the water outlet pipe, and the ozone tail gas is input into the tail gas treatment unit through the first tail gas collecting pipe.
The fourth aspect of the invention provides a backwashing method of a sewage ozone catalytic oxidation treatment system, which comprises the following steps:
a) after backwash gas is input into the water distribution and gas distribution area by the blower, backwash water is input into the water distribution and gas distribution area by the water outlet unit;
b) and after passing through the ozone catalytic oxidation area, the backwashing water and the backwashing gas are collected by the water collecting channel in the water collecting area and discharged by the backwashing wastewater pipe through the backwashing wastewater collecting channel.
Preferably, in step a), the backwash gas is input into the water and gas distribution region through a backwash gas inlet pipe, and the backwash water is input into the water and gas distribution region through a backwash water pipe.
As mentioned above, the system and the method for catalytic oxidation treatment of sewage by ozone provided by the invention have the following beneficial effects:
(1) the sewage ozone catalytic oxidation treatment system and the method thereof provided by the invention can be operated in a gas-liquid countercurrent contact mode and a gas-liquid cocurrent contact mode, and the operation modes are flexible and various.
(2) According to the sewage ozone catalytic oxidation treatment system and the sewage ozone catalytic oxidation treatment method, ozone is directly introduced into the water ejector in the liquid flow forward flow passage or the liquid flow reverse flow passage, so that the ozone and the inlet water are fully mixed, the catalytic oxidation effect of the ozone is improved, and the utilization efficiency of the ozone is increased.
(3) According to the sewage ozone catalytic oxidation treatment system and the method thereof, the water and gas distribution layer is arranged in the ozone catalytic oxidation unit and used for uniformly distributing gas and water and intercepting the fallen catalyst, so that the reaction efficiency is improved and the service life of the catalyst is prolonged.
(4) According to the sewage ozone catalytic oxidation treatment system and the method thereof, the liquid flow downstream passage is formed, the ozone and the water are fully mixed, and meanwhile, the sewage treatment of various scales and the addition of ozone with various doses can be realized by controlling the water inflow and the circulating water amount, so that the system has wide adaptability.
(5) According to the sewage ozone catalytic oxidation treatment system and the sewage ozone catalytic oxidation treatment method, the liquid flow downstream passage is formed, and the recycling of tail gas carried in the discharged water is realized through the circulating pipe provided with the water outlet unit, so that the ozone utilization efficiency is improved.
(6) According to the sewage ozone catalytic oxidation treatment system and the sewage ozone catalytic oxidation treatment method, the water outlet unit is arranged to realize the baffling reciprocating operation of the outlet water, so that ozone tail gas carried in the outlet water overflows, and the normal operation of a subsequent system is prevented from being interfered.
(7) According to the sewage ozone catalytic oxidation treatment system and the sewage ozone catalytic oxidation treatment method, the full-automatic operation of the system can be realized by arranging the electric gate and the electric valve, and the operation and management are convenient.
(8) According to the sewage ozone catalytic oxidation treatment system and method provided by the invention, the tail gas treatment unit is arranged, so that the collection of ozone tail gas and the decomposition and damage of ozone are realized, and secondary pollution is avoided.
Drawings
FIG. 1 is a schematic diagram showing the operation of a liquid flow forward flow passage, a gas flow passage and a back flush passage of a sewage ozone catalytic oxidation treatment system.
FIG. 2 is a schematic diagram showing the operation of the liquid flow countercurrent passage, the gas flow passage and the back flushing passage of the sewage ozone catalytic oxidation treatment system.
FIG. 3 is a view showing the structure of a first gas distribution branch pipe in a liquid flow countercurrent passage of a sewage ozone catalytic oxidation treatment system.
Reference numerals
1 Water intake Unit
2 ozone catalytic oxidation unit
21 water collection area
211 collecting canal
22 ozone catalytic oxidation zone
221 catalyst packing layer
222 water and gas distribution layer
223 support plate
224 water cap
23 water distribution and air distribution area
231 single water-distributing and air-distributing pipe
232 first gas distribution branch pipe
233 second gas distribution branch pipe
234 ozone gas distribution plate
3 water outlet unit
31 corridor
4 tail gas treatment unit
5 water inlet pipe
51 first water inlet branch pipe
52 water inlet pump
53 second water inlet branch pipe
54 first water inlet valve
55 second water inlet valve
6 water ejector
7 ozone inlet pipe
71 ozone inlet valve
81 backwash air inlet pipe
82 backwashing air inlet valve
83 blower
9 backwashing wastewater collection channel
91 backwashing wastewater gate
92 backwashing wastewater pipe
101 circulating main pipe
102 circulation branch pipe
103 circulating valve
111 outlet pipe
112 water outlet valve
121 first backwash water branch pipe
122 backwash water pump
123 second backwash water branch pipe
124 first backwash water valve
125 second backwash water valve
131 first exhaust collecting pipe
132 second exhaust gas collecting pipe
133 first tail gas collecting valve
134 second exhaust gas collecting valve
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 3. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The invention provides a sewage ozone catalytic oxidation treatment system, which comprises a water inlet unit, an ozone catalytic oxidation unit, a water outlet unit and a tail gas treatment unit, wherein a water collecting area, an ozone catalytic oxidation area and a water and gas distributing area are sequentially arranged in the ozone catalytic oxidation unit from top to bottom as shown in figures 1-2;
the water inlet unit and/or the water outlet unit are communicated with the water distribution and air distribution area along the water inlet direction, and the water collection area is communicated with the water outlet unit along the water outlet direction to form a liquid flow downstream passage;
the water inlet unit is communicated with the water collecting area along the water inlet direction, and the water distribution and air distribution area is communicated with the water outlet unit along the water outlet direction to form a liquid flow countercurrent passage;
the water outlet unit and/or the water collecting area are/is communicated with the tail gas treatment unit along the gas outlet direction to form a gas flow passage;
the water outlet unit is communicated with the water distribution and gas distribution area along the backwashing water inlet direction to form a backwashing passage.
In the sewage catalytic ozonation treatment system provided by the invention, the water inlet unit is a water inlet tank.
In the ozone catalytic oxidation treatment system for sewage provided by the invention, as shown in fig. 1-2, a water inlet unit is communicated with an ozone catalytic oxidation unit through a water inlet pipe, the water inlet pipe is sequentially provided with a first water inlet branch pipe, a water inlet pump and a second water inlet branch pipe along the water inlet direction, the first water inlet branch pipe is provided with a first water inlet valve, and the second water inlet branch pipe is provided with a second water inlet valve. The first water inlet valve and the second water inlet valve are used for controlling the water inflow.
In a preferred embodiment, as shown in fig. 1, in the liquid flow downstream passage, a water ejector is arranged on the second water inlet branch pipe, and the water ejector is externally connected with an ozone inlet pipe. The water ejector is combined with the water inlet pump, so that gas-liquid mixing of ozone input through the ozone inlet pipe and sewage input through the water inlet unit can be realized.
In the liquid flow concurrent flow passage, the inlet water flows into the ozone catalytic oxidation unit from the water inlet unit in a pressure flow mode.
Specifically, as shown in FIG. 1, the water ejector is provided on a second water inlet branch pipe between the water inlet pump and a second water inlet valve.
The invention provides a sewage ozone catalytic oxidation treatment system, wherein an ozone catalytic oxidation unit is a closed tank body.
In the ozone catalytic oxidation treatment system for sewage, a water distribution and air distribution pipe is arranged in the water distribution and air distribution area, and is selected from one of a single water distribution and air distribution pipe or a composite air distribution pipe; as shown in fig. 1, in the liquid flow downstream passage, the water distribution and air distribution pipe is a single water distribution and air distribution pipe; as shown in fig. 2, in the liquid flow countercurrent passage, the water and gas distribution pipe is a composite gas distribution pipe.
In a preferred embodiment, the bottom of the single water and air distribution pipe is provided with a plurality of perforations. Used for water distribution and gas distribution.
In a preferred embodiment, as shown in fig. 1, one end of the single water distribution and air distribution pipe is communicated with the second water inlet branch pipe, the other end of the single water distribution and air distribution pipe is externally connected with a backwashing air inlet pipe, and the backwashing air inlet pipe is provided with a backwashing air inlet valve and is connected with an air blower.
The single water and gas distribution pipe can input backwash gas into the water and gas distribution area through the blower.
In a preferred embodiment, as shown in fig. 2, the composite gas distribution pipe includes a first gas distribution branch pipe and a second gas distribution branch pipe, the first gas distribution branch pipe is externally connected with an ozone inlet pipe, and the ozone inlet pipe is provided with an ozone inlet valve; and the second gas distribution branch pipe is externally connected with a backwashing gas inlet pipe, and the backwashing gas inlet pipe is provided with a backwashing gas inlet valve and is connected with an air blower.
Specifically, as shown in fig. 3, the first gas distribution branch pipe is provided with a plurality of ozone distribution disks, and the bottom of the second gas distribution branch pipe is provided with a plurality of through holes.
The first gas distribution branch pipe can enable ozone input through the ozone inlet pipe to be uniformly distributed in the ozone catalytic oxidation unit, and the second gas distribution branch pipe enables gas generated by the air blower during backwashing to uniformly enter the ozone catalytic oxidation unit.
In the catalytic ozonation treatment system for sewage provided by the invention, as shown in fig. 1-2, a catalyst packing layer, a water and gas distribution layer and a support plate are sequentially arranged in an ozonation area from top to bottom, and a plurality of water caps are arranged on the support plate.
In a preferred embodiment, the catalyst filler layer is selected from one of alumina-based multimetallic catalysts, ceramic-based multimetallic catalysts or iron-based catalysts. The catalyst filler is a conventional existing catalyst and can be purchased from the market.
The catalyst filler can enable ozone to generate hydroxyl radicals under the catalytic action of the catalyst, and organic pollutants which are difficult to degrade in sewage are removed through the strong oxidizing property of the hydroxyl radicals.
In a preferred embodiment, the water and gas distribution layer is a gravel layer or a quartz sand layer. The catalyst is used for uniformly distributing gas and water and intercepting the fallen catalyst, so that the reaction efficiency is improved and the service life of the catalyst is prolonged.
In a preferred embodiment, the ratio of the heights of the catalyst packing layer, the water and gas distribution layer and the support plate is 20-40: 2-4: 1 to 2.
Specifically, the height of the catalyst filler layer is 2-4 m, the height of the water and air distribution layer is 0.2-0.4 m, and the height of the support plate is 0.1-0.2 m.
In a preferred embodiment, the water cap is made of ABS plastic. The water cap can evenly distribute water or evenly collect produced water, and short flow of the ozone catalytic oxidation unit is avoided.
In the present invention, as shown in fig. 1-2, a water collecting channel is provided in the water collecting area.
In a preferred embodiment, as shown in fig. 1-2, the water collecting channel is communicated with a backwashing wastewater collecting channel, a backwashing wastewater gate is arranged between the water collecting channel and the backwashing wastewater collecting channel, and the backwashing wastewater collecting channel is externally connected with a backwashing wastewater pipe. Used for collecting the backwashing wastewater generated by the ozone catalytic oxidation unit and discharging the backwashing wastewater out of the backwashing wastewater pipe.
In a preferred embodiment, as shown in FIG. 2, the catchment channel communicates with a second inlet leg in the flow counterflow path.
In the liquid flow countercurrent passage, the inlet water flows into the ozone catalytic oxidation unit from the water inlet unit through the water collecting channel in the form of gravity flow.
The invention provides a sewage ozone catalytic oxidation treatment system, wherein the water outlet unit is a closed water outlet contact tank.
In the catalytic ozonation treatment system for sewage provided by the invention, as shown in fig. 1-2, a plurality of galleries are arranged in the water outlet unit. The corridor realizes the separation of water and ozone tail gas through the baffling reciprocating motion of water flow, and avoids the water to influence the subsequent system.
In a preferred embodiment, as shown in fig. 1-2, a spacing is maintained between adjacent galleries.
In a preferred embodiment, as shown in fig. 1, in the liquid flow concurrent flow path, the water outlet unit is communicated with the first water inlet branch pipe through a circulation pipe, the circulation pipe comprises a main circulation pipe and a plurality of branch circulation pipes, one end of the branch circulation pipe is communicated with the water outlet unit, the other end of the branch circulation pipe is communicated with the main circulation pipe, the main circulation pipe is also communicated with the first water inlet branch pipe, and the branch circulation pipe is provided with a circulation valve. The circulating valve is used for controlling the amount of circulating water.
In the sewage catalytic ozonation treatment system provided by the invention, as shown in fig. 1-2, the water outlet unit is communicated with the ozone catalytic ozonation unit through a water outlet pipe, and the water outlet pipe is provided with a water outlet valve.
In a preferred embodiment, as shown in fig. 1, in the liquid flow downstream path, the water outlet unit is communicated with a water collecting channel through a water outlet pipe; as shown in fig. 2, in the liquid flow countercurrent passage, the water outlet unit is communicated with the water and gas distribution area through a water outlet pipe. Used for collecting the water produced by the ozone catalytic oxidation unit.
In the ozone catalytic oxidation treatment system for sewage, as shown in fig. 1-2, the water outlet unit is communicated with a water and gas distribution area through a backwashing water pipe, the backwashing water pipe is sequentially provided with a first backwashing water branch pipe, a backwashing water pump and a second backwashing water branch pipe along a backwashing water inlet direction, the first backwashing water branch pipe is provided with a first backwashing water valve, and the second backwashing water branch pipe is provided with a second backwashing water valve.
The invention provides a sewage ozone catalytic oxidation treatment system, wherein a tail gas treatment unit is a tail gas destructor. The tail gas destructor is an ozone tail gas destructor sold in the market, and catalytic decomposition or thermal decomposition is adopted for ozone in the tail gas. The tail gas treatment unit decomposes and destroys ozone, so that tail gas reaches the standard and is discharged.
In the ozone catalytic oxidation treatment system for sewage provided by the invention, as shown in fig. 1-2, the tail gas treatment unit is communicated with the water outlet unit through a first tail gas collecting pipe, a second tail gas collecting pipe is externally connected to the first tail gas collecting pipe, one end of the second tail gas collecting pipe is communicated with the water collecting area, and the other end of the second tail gas collecting pipe is communicated with the first tail gas collecting pipe.
In a preferred embodiment, as shown in fig. 1-2, a first exhaust gas collecting valve is disposed on the first exhaust gas collecting pipe, and a second exhaust gas collecting valve is disposed on the second exhaust gas collecting pipe.
The valves are all electrically operated valves. The gates are all electric gates.
The second aspect of the invention provides a gas-liquid concurrent flow treatment method for sewage ozone catalytic oxidation, which adopts the sewage ozone catalytic oxidation treatment system and comprises the following steps:
1) mixing the inlet water in the water inlet unit and the return water in the water outlet unit, inputting ozone for mixing, inputting the mixture into a water distribution and gas distribution area of the ozone catalytic oxidation unit along the water inlet direction, and accumulating the ozone tail gas and the outlet water containing the ozone tail gas in a water collection area after the mixture is treated by the ozone catalytic oxidation area;
2) inputting the ozone tail gas accumulated in the water collection area obtained in the step 1) into a tail gas treatment unit for decomposition and then discharging the ozone tail gas after reaching the standard;
3) the effluent containing the ozone tail gas obtained in the step 1) is input into a water outlet unit and then is separated into ozone tail gas and effluent, the ozone tail gas is input into a tail gas treatment unit for decomposition and then is discharged after reaching the standard, and the effluent part is used as return water to be mixed with the inlet water in the water inlet unit and then flows back to the ozone catalytic oxidation unit.
In the step 1), the inlet water in the water inlet unit is input into a water and gas distribution area through a water inlet pipe, the return water in the water outlet unit is input into the water inlet pipe through a circulating pipe, and the ozone is input into the water inlet pipe through an ozone inlet pipe and a water injector.
In the invention, in the step 2), the ozone tail gas accumulated in the water collecting area is input into a tail gas treatment unit through a second tail gas collecting pipe.
In the step 3), the effluent containing the ozone tail gas is input into a water outlet unit and then separated into the ozone tail gas and effluent, and the ozone tail gas and the effluent are treated by a gallery.
In the invention, in the step 3), the effluent containing ozone tail gas is input into a water outlet unit through a water outlet pipe, and the ozone tail gas is input into a tail gas treatment unit through a first tail gas collecting pipe.
The third aspect of the invention provides a gas-liquid countercurrent treatment method for sewage ozone catalytic oxidation, which adopts the sewage ozone catalytic oxidation treatment system and comprises the following steps:
A) inputting inlet water in a water inlet unit into a water collecting area of an ozone catalytic oxidation unit, then enabling the inlet water to flow into an ozone catalytic oxidation area from top to bottom, inputting ozone into a water distribution and gas distribution area, then enabling the inlet water to flow into the ozone catalytic oxidation area from bottom to top, and enabling the inlet water and the ozone to be mixed and reacted in the ozone catalytic oxidation area to form ozone tail gas and outlet water containing the ozone tail gas;
B) the ozone tail gas formed in the step A) flows into a water collecting area from bottom to top to be accumulated, and then is input into a tail gas treatment unit to be decomposed and discharged after reaching the standard;
C) and B), after the effluent containing the ozone tail gas formed in the step A) flows into the water distribution and gas distribution area from top to bottom, the effluent is input into a water outlet unit and then is separated into ozone tail gas and effluent, and the ozone tail gas is input into a tail gas treatment unit to be decomposed and then is discharged after reaching the standard.
In the invention, in the step A), the inlet water in the water inlet unit is input into a water collecting channel in a water collecting area through a water inlet pipe.
In the step A), ozone is sequentially input into a water and gas distribution area through an ozone inlet pipe and a first gas distribution branch pipe.
In the invention, in the step B), the ozone tail gas accumulated in the water collecting area is input into a tail gas treatment unit through a second tail gas collecting pipe.
In the step C), the effluent containing the ozone tail gas is input into a water outlet unit and then separated into the ozone tail gas and effluent, and the ozone tail gas and the effluent are treated by a gallery.
In the step C), the effluent containing ozone tail gas is input into a water outlet unit through a water outlet pipe, and the ozone tail gas is input into a tail gas treatment unit through a first tail gas collecting pipe.
The fourth aspect of the invention provides a backwashing method of a sewage ozone catalytic oxidation treatment system, which comprises the following steps:
a) after backwash gas is input into the water distribution and gas distribution area by the blower, backwash water is input into the water distribution and gas distribution area by the water outlet unit;
b) and after passing through the ozone catalytic oxidation area, the backwashing water and the backwashing gas are collected by the water collecting channel in the water collecting area and discharged by the backwashing wastewater pipe through the backwashing wastewater collecting channel.
In the backwashing method of the sewage ozone catalytic oxidation treatment system, in the step a), backwashing gas is input into a water and gas distribution area through a backwashing gas inlet pipe, and backwashing water is input into the water and gas distribution area through a backwashing water pipe.
Example 1
After a user obtains the sewage ozone catalytic oxidation treatment system, the system operates according to a liquid flow downstream passage and an air flow passage shown in figure 1, the water inlet in a water inlet unit is input into a first water inlet branch pipe through a water inlet pump, the return water in a water outlet unit flowing out through a circulating pipe is also input into the first water inlet branch pipe, the water inlet and the return water are mixed in the first water inlet branch pipe and then input into a second water inlet branch pipe, the ozone input through an ozone inlet pipe enters the second water inlet branch pipe through a water injector and then is input into a water and water distribution area through a single water and water distribution pipe, and the ozone, the water inlet and the return water are fully mixed.
Then the mixture is distributed by water through a water cap on a support plate in the ozone catalytic oxidation area in sequence, and then enters a catalyst packing layer through a water distribution and gas distribution layer made of gravel or quartz sand, so that the ozone generates hydroxyl free radicals under the catalytic action of the catalyst, and the degradation-resistant organic pollutants in the sewage are removed through strong oxidation. And then the ozone tail gas and the effluent containing the ozone tail gas are gathered in the water collection area, and the effluent containing the ozone tail gas is collected by the water collection channel.
Ozone tail gas accumulated in the water collecting area is input into the tail gas treatment unit through the second tail gas collecting pipe to decompose and destroy ozone, so that the tail gas reaches the standard and is discharged.
The outlet water containing the ozone tail gas is input into the outlet water unit through the outlet pipe, and the discharge of the ozone tail gas in the outlet water is realized in the outlet water unit through the baffling reciprocating motion of the water flow in the gallery, so that the ozone tail gas and the outlet water are separated. Ozone tail gas is input into the tail gas treatment unit through the first tail gas collecting pipe, and the ozone is decomposed and destroyed, so that the tail gas is discharged up to the standard. In the water outlet unit, the water outlet part is used as return water and then is input into the first water inlet branch pipe through the circulating pipe to form circulation.
Example 2
After obtaining the sewage ozone catalytic oxidation treatment system, a user operates according to the liquid flow countercurrent passage and the air flow passage shown in fig. 2, and the inlet water in the inlet unit is input into the first inlet branch pipe and then the second inlet branch pipe through the inlet pump and then the inlet water is input into the water collecting channel in the water collecting area of the ozone catalytic oxidation unit.
The inlet water flows into the catalytic ozonation area from top to bottom from the water collecting channel. Ozone is input into the water and gas distribution area through the ozone inlet pipe and the first gas distribution branch pipe in the composite gas distribution pipe in sequence and flows into the ozone catalytic oxidation area from bottom to top. The inlet water and the ozone are mixed and reacted in the ozone catalytic oxidation area, namely the ozone sequentially passes through a water cap on a support plate in the ozone catalytic oxidation area, then passes through a water distribution and gas distribution layer made of gravel or quartz sand, and enters a catalyst packing layer, so that the ozone generates hydroxyl radicals under the catalytic action of the catalyst, organic pollutants which are difficult to degrade in the inlet water are removed by strong oxidation, and ozone tail gas and outlet water containing the ozone tail gas are formed.
Ozone tail gas flows into the water collecting area from bottom to top to be accumulated, and is input into the tail gas treatment unit through the second tail gas collecting pipe to decompose and destroy ozone, so that the tail gas reaches the standard and is discharged.
The outlet water containing ozone tail gas flows into the water distribution and gas distribution area from top to bottom, then is input into the water outlet unit through the water outlet pipe, and the ozone tail gas in the outlet water is discharged in the water outlet unit through the baffling reciprocating motion of water flow in the gallery and is separated into ozone tail gas and outlet water. Ozone tail gas is input into the tail gas treatment unit through the first tail gas collecting pipe, and the ozone is decomposed and destroyed, so that the tail gas is discharged up to the standard.
Example 3
When the sewage catalytic ozonation treatment system operates for a period of time as in example 1 or example 2, and after a catalyst packing layer in the catalytic ozonation unit is found to be polluted and blocked, backwashing operation is carried out along a backwashing passage. And a second water inlet valve on the second water inlet branch pipe and a water outlet valve on the water outlet pipe are automatically closed, a backwashing wastewater gate and a backwashing air inlet valve on a backwashing air inlet pipe are firstly opened, and backwashing gas is input into the water and gas distribution area through the backwashing air inlet pipe by the air blower. After a period of time, a first backwashing water valve on the first backwashing water branch pipe and a second backwashing water valve on the second backwashing water branch pipe are opened, and backwashing water is input into the water distribution and gas distribution area by the water outlet unit through the first backwashing water branch pipe and the second backwashing water branch pipe under the action of the backwashing water pump. And after a period of time, closing the air blower and the backwashing air inlet valve, and finally closing the first backwashing water valve, the second backwashing water valve and the backwashing water pump. Waste liquid generated by the ozone catalytic oxidation unit through gas washing, gas water washing and water washing is collected by the water collecting channel of the water collecting area and is discharged by the backwashing waste water pipe through the backwashing waste water collecting channel, so that the problem of pollution and blockage of the catalyst packing layer is solved.
Example 4
The method of the reverse flow path of the gas and the liquid in the embodiment 2 is adopted to treat the biochemical effluent of the pharmaceutical wastewater. The COD of raw water is 120-200 mg/L, the COD is 55-100 mg/L after the treatment of the system, the removal rate of the COD is 55-60%, and the removal amount of ozone/COD is 1.1-1.5. The wastewater is treated by the system to obtain good COD removal effect and ozone utilization efficiency.
In summary, the system and the method for treating sewage by catalytic ozonation provided by the invention realize full mixing and contact of ozone and sewage by forming the liquid flow downstream passage, the liquid flow upstream passage, the air flow passage and the back flush passage, thereby improving the catalytic ozonation efficiency of ozone; the ozone and the sewage can be fully mixed, the ozone can be fully utilized, and no secondary pollution is generated; the method is suitable for catalytic ozonation treatment of sewage of various scales, has the characteristics of flexibility, applicability and the like, and can be used for catalytic ozonation pretreatment or advanced treatment of various sewage. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A sewage ozone catalytic oxidation treatment system is characterized by comprising a water inlet unit (1), an ozone catalytic oxidation unit (2), a water outlet unit (3) and a tail gas treatment unit (4), wherein a water collecting area (21), an ozone catalytic oxidation area (22) and a water and gas distributing area (23) are sequentially arranged in the ozone catalytic oxidation unit (2) from top to bottom;
the water inlet unit (1) and/or the water outlet unit (2) are communicated with the water distribution and air distribution area (23) along the water inlet direction, and the water collection area (21) is communicated with the water outlet unit (3) along the water outlet direction to form a liquid flow downstream passage;
the water inlet unit (1) is communicated with the water collecting area (21) along the water inlet direction, and the water distribution and gas distribution area (23) is communicated with the water outlet unit (3) along the water outlet direction to form a liquid flow countercurrent passage;
the water outlet unit (3) and/or the water collecting area (21) are/is communicated with the tail gas treatment unit (4) along the gas outlet direction to form a gas flow passage;
the water outlet unit (3) is communicated with the water and gas distribution area (23) along the backwashing water inlet direction to form a backwashing passage.
2. The sewage ozone catalytic oxidation treatment system according to claim 1, wherein the water inlet unit (1) is communicated with the ozone catalytic oxidation unit (2) through a water inlet pipe (5), the water inlet pipe (5) is sequentially provided with a first water inlet branch pipe (51), a water inlet pump (52) and a second water inlet branch pipe (53) along a water inlet direction, the first water inlet branch pipe (51) is provided with a first water inlet valve (54), and the second water inlet branch pipe (53) is provided with a second water inlet valve (55); in the liquid flow downstream passage, a water ejector (6) is arranged on the second water inlet branch pipe (53), and an ozone inlet pipe (7) is externally connected with the water ejector (6).
3. The catalytic ozonation treatment system of wastewater according to claim 1, wherein the catalytic ozonation unit (2) comprises one or more of the following features:
A1) a water distribution and air distribution pipe is arranged in the water distribution and air distribution area (23), and the water distribution and air distribution pipe is selected from one of a single water distribution and air distribution pipe (231) or a composite air distribution pipe; in the liquid flow downstream passage, the water distribution and air distribution pipe is a single water distribution and air distribution pipe (231); in the liquid flow countercurrent passage, the water distribution and air distribution pipe is a composite air distribution pipe;
A2) a catalyst packing layer (221), a water and gas distribution layer (222) and a support plate (223) are sequentially arranged in the ozone catalytic oxidation area (22) from top to bottom, and a plurality of water caps (224) are arranged on the support plate (223);
A3) a water collecting channel (211) is arranged in the water collecting area (21); the water collecting channel (211) is communicated with the backwashing wastewater collecting channel (9), a backwashing wastewater gate (91) is arranged between the water collecting channel (211) and the backwashing wastewater collecting channel (9), and the backwashing wastewater collecting channel (9) is externally connected with a backwashing wastewater pipe (92).
4. The catalytic ozonation treatment system for sewage according to claim 3, wherein the water distribution and gas distribution pipe comprises one or more of the following characteristics:
B1) one end of the single water distribution and air distribution pipe (231) is communicated with the second water inlet branch pipe (53), the other end of the single water distribution and air distribution pipe (231) is externally connected with a backwashing air inlet pipe (81), and a backwashing air inlet valve (82) is arranged on the backwashing air inlet pipe (81) and is connected with an air blower (83);
B2) the composite gas distribution pipe comprises a first gas distribution branch pipe (232) and a second gas distribution branch pipe (233), the first gas distribution branch pipe (232) is externally connected with an ozone inlet pipe (7), and an ozone inlet valve (71) is arranged on the ozone inlet pipe (7); the second gas distribution branch pipe (233) is externally connected with a backwashing gas inlet pipe (81), and a backwashing gas inlet valve (82) is arranged on the backwashing gas inlet pipe (81) and is connected with an air blower (83); the first gas distribution branch pipe (233) is provided with a plurality of ozone gas distribution disks (234), and the bottom of the second gas distribution branch pipe (233) is provided with a plurality of through holes.
5. The catalytic ozonation treatment system of sewage according to claim 1, wherein a plurality of galleries (31) are provided in the effluent unit (3); in the liquid flow forward flow passage, the water outlet unit (3) is communicated with a first water inlet branch pipe (51) through a circulating pipe, the circulating pipe comprises a main circulating pipe (101) and a plurality of branch circulating pipes (102), one end of each branch circulating pipe (102) is communicated with the water outlet unit (3), the other end of each branch circulating pipe (102) is communicated with the main circulating pipe (101), the main circulating pipe (101) is also communicated with the first water inlet branch pipe (51), and a circulating valve (103) is arranged on each branch circulating pipe (102).
6. The sewage ozone catalytic oxidation treatment system according to claim 1, wherein the water outlet unit (3) is communicated with the ozone catalytic oxidation unit (2) through a water outlet pipe (111), and a water outlet valve (112) is arranged on the water outlet pipe (111); the water outlet unit (3) is communicated with the water and gas distribution area (23) through a backwashing water pipe, the backwashing water pipe is sequentially provided with a first backwashing water branch pipe (121), a backwashing water pump (122) and a second backwashing water branch pipe (123) along a backwashing water inlet direction, the first backwashing water branch pipe (121) is provided with a first backwashing water valve (124), and the second backwashing water branch pipe (123) is provided with a second backwashing water valve (125).
7. The sewage ozone catalytic oxidation treatment system according to claim 1, wherein the tail gas treatment unit (4) is communicated with the water outlet unit (3) through a first tail gas collecting pipe (131), a second tail gas collecting pipe (132) is externally connected to the first tail gas collecting pipe (131), one end of the second tail gas collecting pipe (132) is communicated with the water collecting area (21), and the other end of the second tail gas collecting pipe (132) is communicated with the first tail gas collecting pipe (131).
8. A gas-liquid concurrent flow treatment method for sewage ozone catalytic oxidation, which adopts the sewage ozone catalytic oxidation treatment system of any one of claims 1 to 7, and comprises the following steps:
1) mixing the inlet water in the water inlet unit and the return water in the water outlet unit, inputting ozone for mixing, inputting the mixture into a water distribution and gas distribution area of the ozone catalytic oxidation unit along the water inlet direction, and accumulating the ozone tail gas and the outlet water containing the ozone tail gas in a water collection area after the mixture is treated by the ozone catalytic oxidation area;
2) inputting the ozone tail gas accumulated in the water collection area obtained in the step 1) into a tail gas treatment unit for decomposition and then discharging the ozone tail gas after reaching the standard;
3) the effluent containing the ozone tail gas obtained in the step 1) is input into a water outlet unit and then is separated into ozone tail gas and effluent, the ozone tail gas is input into a tail gas treatment unit for decomposition and then is discharged after reaching the standard, and the effluent part is used as return water to be mixed with the inlet water in the water inlet unit and then flows back to the ozone catalytic oxidation unit.
9. A gas-liquid countercurrent treatment method for sewage ozone catalytic oxidation, which adopts the sewage ozone catalytic oxidation treatment system of any one of claims 1 to 7, and comprises the following steps:
A) inputting inlet water in a water inlet unit into a water collecting area of an ozone catalytic oxidation unit, then enabling the inlet water to flow into an ozone catalytic oxidation area from top to bottom, inputting ozone into a water distribution and gas distribution area, then enabling the inlet water to flow into the ozone catalytic oxidation area from bottom to top, and enabling the inlet water and the ozone to be mixed and reacted in the ozone catalytic oxidation area to form ozone tail gas and outlet water containing the ozone tail gas;
B) the ozone tail gas formed in the step A) flows into a water collecting area from bottom to top to be accumulated, and then is input into a tail gas treatment unit to be decomposed and discharged after reaching the standard;
C) and B), after the effluent containing the ozone tail gas formed in the step A) flows into the water distribution and gas distribution area from top to bottom, the effluent is input into a water outlet unit and then is separated into ozone tail gas and effluent, and the ozone tail gas is input into a tail gas treatment unit to be decomposed and then is discharged after reaching the standard.
10. A backwashing method of a sewage ozone catalytic oxidation treatment system, which uses the sewage ozone catalytic oxidation treatment system of any one of claims 1 to 7, and comprises the following steps:
a) after backwash gas is input into the water distribution and gas distribution area by the blower, backwash water is input into the water distribution and gas distribution area by the water outlet unit;
b) and after passing through the ozone catalytic oxidation area, the backwashing water and the backwashing gas are collected by the water collecting channel in the water collecting area and discharged by the backwashing wastewater pipe through the backwashing wastewater collecting channel.
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| CN113716756A (en) * | 2021-09-18 | 2021-11-30 | 上海中耀环保实业有限公司 | Non-load type ozone catalytic oxidation sewage treatment system and method |
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| CN113716756A (en) * | 2021-09-18 | 2021-11-30 | 上海中耀环保实业有限公司 | Non-load type ozone catalytic oxidation sewage treatment system and method |
| CN113716756B (en) * | 2021-09-18 | 2022-06-21 | 上海中耀环保实业有限公司 | Non-load type ozone catalytic oxidation sewage treatment system and method |
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