CN217077108U - Sewage treatment system based on ozone catalytic oxidation air supporting integration - Google Patents
Sewage treatment system based on ozone catalytic oxidation air supporting integration Download PDFInfo
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Abstract
The utility model provides a sewage treatment system based on ozone catalytic oxidation air flotation integration, which comprises a catalytic oxidation system, and a water inlet system and an ozone air flotation system which are respectively communicated with the catalytic oxidation system; the catalytic oxidation system comprises a catalytic oxidation reaction tank and at least two catalytic oxidation layers which are sequentially arranged in the catalytic oxidation reaction tank from top to bottom; the ozone air floatation system comprises an ozone generator and a microporous aerator which is arranged in the catalytic oxidation reaction tank and is positioned below the catalytic oxidation layer; the water inlet of the water inlet system is positioned below the catalytic oxidation layer; ozone enters the catalytic oxidation reaction tank through the microporous aerator, and is mixed with sewage entering from a water inlet system and then sequentially passes through each catalytic oxidation layer, so that catalytic oxidation is completed while ozone is floated, and sewage treatment is realized. The utility model discloses set up multilayer catalytic oxidation layer, multilayer catalytic oxidation layer from the top down sets gradually in catalytic oxidation retort simultaneously, and sewage treatment is effectual, and the structure of device is more compact succinct.
Description
Technical Field
The utility model relates to a water environmental protection technical field especially relates to a sewage treatment system based on ozone catalytic oxidation air supporting integration.
Background
The urban combined drainage system is mostly adopted in cities built at an early stage, and urban combined overflow pollution is serious along with the development of the cities. Combined overflow (CSO) is a mixture of sewage and rainwater, and contains a large amount of pollutants. Data of a plurality of domestic cities show that pollutants such as COD, TSS and the like in combined overflow have high concentration and large change, and partial actually measured data TSS can even reach more than 1000 mg/L.
At present, common methods for combined overflow treatment include a hydrocyclone separator, a high-efficiency sedimentation tank, a magnetic coagulation high-density sedimentation tank and the like. From the prior art, the COD pollutant in the primary rain pollution is basically lack of treatment. If a biochemical process treatment procedure is adopted, the COD index is difficult to be effectively removed due to the problems of large COD change coefficient, too short retention time, carbon-nitrogen imbalance, difficult routine maintenance and the like. Therefore, it is necessary to develop a rapid treatment technique capable of simultaneously treating pollution indexes such as SS, TP, and COD.
The traditional ozone air floatation process is mainly used for advanced sewage treatment or treatment of industrial wastewater such as oily wastewater, printing and dyeing wastewater and the like. In order to further improve ozone oxidation efficiency, combine heterogeneous ozone catalytic oxidation, develop a novel ozone air supporting device, accomplish a plurality of processes such as breakdown of emulsion or flocculation, solid-liquid separation, color removal, smell, taste, disinfection simultaneously in an operating unit, suspended particulate matter and colloid in can high-efficiently getting rid of the aquatic are particularly suitable for the sewage that quality of water fluctuation is big such as quick processing first rain and CSO.
Patent application No. CN201710726484.1 discloses a catalytic ozonation-ozone floatation integrated device, which comprises an ozone floatation unit, a first catalytic ozonation unit and a second catalytic ozonation unit, wherein an ozone oxidation reaction is completed in the ozone floatation unit, and then two catalytic oxidation reactions are completed sequentially through the first catalytic ozonation unit and the second catalytic ozonation unit. The device has the following disadvantages: (1) the ozone floatation unit, the first catalytic ozonation unit and the second catalytic ozonation unit of the device are distributed, so that the whole device occupies a large amount of space and the applicability is limited; (2) ozone is passed through each cell in sequence, and a large amount of ozone is required to ensure the concentration of ozone.
In view of the above, there is a need to design an improved ozone catalytic oxidation air flotation integrated sewage treatment system to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sewage treatment system based on ozone catalytic oxidation air supporting integration has set up multilayer catalytic oxidation layer, and multilayer catalytic oxidation layer from the top down sets gradually in catalytic oxidation retort, and sewage treatment is effectual, and the structure of device is more compact succinct, can extensively be applicable to the sewage treatment field.
In order to achieve the aim, the utility model provides a sewage treatment system based on ozone catalytic oxidation and air floatation integration, which comprises a catalytic oxidation system, and a water inlet system and an ozone air floatation system which are respectively communicated with the catalytic oxidation system; the catalytic oxidation system comprises a catalytic oxidation reaction tank and at least two catalytic oxidation layers which are sequentially arranged in the catalytic oxidation reaction tank from top to bottom; the ozone floatation system comprises an ozone generator and a microporous aerator which is arranged in the catalytic oxidation reaction tank and is positioned below the catalytic oxidation layer; the water inlet of the water inlet system is positioned below the catalytic oxidation layer; ozone enters the catalytic oxidation reaction tank through the microporous aerator, is mixed with sewage entering from the water inlet system and then sequentially passes through each catalytic oxidation layer, catalytic oxidation is completed while ozone air floatation is performed, and sewage treatment is realized.
As a further improvement of the present invention, the catalytic oxidation layer includes a carrier and an active catalyst, and the active catalyst is supported on the carrier.
As a further improvement of the utility model, the ozone air supporting system further comprises an air compressor, the air compressor and the ozone generator respectively sends air and ozone into simultaneously the micropore aerator is mixed.
As a further improvement of the utility model, the upper part of the catalytic oxidation reaction tank is provided with a discharge system for discharging various substances obtained after sewage treatment.
As a further improvement of the utility model, the discharge system comprises a water outlet pipe and a slag discharge system, the treated sewage is discharged from the water outlet pipe, and scum is discharged from the slag discharge system.
As a further improvement of the present invention, the slag discharging system includes a scum pipe for discharging scum.
As a further improvement of the utility model, the water inlet system comprises a sewage tank and a lifting pump arranged at the water outlet end of the sewage tank, the lifting pump is used for pumping the sewage into the catalytic oxidation reaction tank.
As a further improvement of the utility model, the water inlet system also comprises a medicine dissolving tank; the water outlet end of the medicine dissolving tank is connected with the water inlet end of the lifting pump.
As a further improvement of the utility model, the water inlet system further comprises a mixer; the mixer is connected to the water outlet end of the lifting pump, and sewage and the medicament of the sewage tank and the medicament dissolving tank are pumped into the mixer and mixed in the mixer.
As a further improvement of the utility model, the mixer is a tubular mixer.
The utility model has the advantages that:
(1) the utility model discloses set up multilayer catalytic oxidation layer, can carry out catalytic oxidation to sewage many times and handle, improve the sewage treatment effect. Meanwhile, the multiple catalytic oxidation layers are sequentially arranged in the catalytic oxidation reaction tank from top to bottom, the whole sewage treatment process is carried out in one reaction tank, the ozone utilization rate is high, the waste of ozone can not be caused, the structure of the device is more compact and simple, and the device can be widely applied to the field of sewage treatment. The number of layers and the dosage of the catalytic oxidation layer can be freely adjusted according to the actual situation, and the method is particularly suitable for the field of CSO treatment with large water quality fluctuation.
(2) The utility model discloses a set up air compressor and ozone generator, can prepare out the microbubble that contains air and ozone, at the air supporting in-process, air and ozone in the microbubble all can with the adhesion of hydrophobic substance in the sewage, reduced the use amount of ozone. When the sewage generates the air floatation reaction, part of pollutants can also generate the oxidation reaction with ozone in the micro bubbles, namely, the ozone can not only provide micro bubbles for the air floatation process, but also can perform the oxidation reaction, so that the ozone is fully utilized, and the sewage treatment efficiency is improved. The device can also freely adjust the proportion of air and ozone according to the actual condition of sewage, fully utilizes the ozone, does not cause the waste of the ozone, and is environment-friendly.
Drawings
FIG. 1 is a schematic structural diagram of the sewage treatment system based on ozone catalytic oxidation and air flotation integration.
Reference numerals
1-a water inlet system; 2-an ozone flotation system; 3-a catalytic oxidation system; 4-a discharge system; 11-a sewage tank; 12-a lift pump; 13-a medicine dissolving tank; 14-a mixer; 21-an ozone generator; 22-a microporous aerator; 23-an air compressor; 31-a catalytic oxidation reaction tank; 32-catalytic oxidation layer; 41-water outlet pipe; 42-scum pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not relevant to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, the utility model provides a sewage treatment system based on ozone catalytic oxidation air supporting integration, including catalytic oxidation system 3 and respectively rather than the water intake system 1 and the ozone air supporting system 2 that communicate. The catalytic oxidation system 3 comprises a catalytic oxidation reaction tank 31 and at least two catalytic oxidation layers 32 which are sequentially arranged in the catalytic oxidation reaction tank 31 from top to bottom; the ozone floatation system 2 comprises an ozone generator 21 and a microporous aerator 22 which is arranged in the catalytic oxidation reaction tank 31 and is positioned below the catalytic oxidation layer 32; the water inlet of the water inlet system 1 is positioned below the catalytic oxidation layer 32. With the arrangement, the ozone prepared by the ozone generator 21 enters the catalytic oxidation reaction tank 31 through the microporous aerator 22, is mixed with the sewage entering from the water inlet system 1 and then sequentially passes through each catalytic oxidation layer 22, and the catalytic oxidation is completed while the ozone is floated, so that the sewage treatment is realized.
Specifically, the water inlet system 1 is disposed at the bottom of the catalytic oxidation reaction tank 31, and includes a sewage tank 11 and a lift pump 12 disposed at the water outlet end of the sewage tank 11. The lift pump 12 can pump the sewage in the sewage tank 11 into the catalytic oxidation reaction tank 31, and can continuously lift the water level of the sewage in the catalytic oxidation reaction tank 31 until the sewage is lifted to the water outlet end of the catalytic oxidation reaction tank 31.
In some embodiments, the water inlet system 1 further comprises a drug dissolving tank 13 and a mixer 14. The water outlet end of the medicine dissolving tank 13 is connected with the water inlet end of the lifting pump 12, and the water outlet end of the lifting pump 12 is connected with the mixer 14. So set up, sewage and the medicament of sewage case 11 and medicine dissolving tank 13 are pumped into blender 14, mix in blender 14, and take place the reaction, carry out preliminary treatment to sewage. Preferably, the mixer 14 is a tube mixer. Finally, the sewage enters the catalytic oxidation reaction tank 31 from the water inlet system 1 arranged at the bottom of the catalytic oxidation reaction tank 31, and the water level continuously rises through the pressure of the lifting pump 12.
The ozone floatation system 2 includes an air compressor 23 in addition to an ozone generator 21 and a micro-porous aerator 22 (disposed in the inner cavity of the catalytic oxidation reaction tank 31). The air outlet ends of the ozone generator 21 and the air compressor 23 are both communicated with the microporous aerator 22, and the air compressor 23 and the ozone generator 21 respectively send air and ozone into the microporous aerator 22 at the same time to be mixed in the microporous aerator 22. The micro-porous aerator 22 is internally provided with an automatic control system for controlling the air input of the air and the ozone. The micro-porous aerator 22 forms a mixed gas of air and ozone into a large number of highly dispersed micro-bubbles, the micro-bubbles are contacted with the sewage with the rising water level to adhere hydrophobic substances in the sewage, and the micro-bubbles and the substances form a whole with the density less than that of the water and float on the water surface.
In the process, when the sewage is subjected to air floatation reaction, part of pollutants are subjected to oxidation reaction with ozone in the microbubbles. At the moment, the ozone can not only provide micro bubbles for the air floatation process, but also carry out oxidation reaction, thereby improving the efficiency of the sewage treatment process. During the rising process of the sewage, the air flotation and oxidation reaction continuously occur.
The air and ozone introducing amount and proportion can be adjusted at any time according to actual conditions. When the COD of the inlet water is less than or equal to 150mg/L, the proportion of ozone in the total air input of the system is less than 30 percent; when the inlet water 300 is more than COD more than 150mg/L, the proportion of ozone in the total air input of the system is more than 30 percent; when the COD of the inlet water is more than or equal to 300mg/L, N-level ozone gas distribution or outlet water reflux can be adopted. As the CSO inlet water quality has large fluctuation, in order to fully play the role of air floatation and reduce the using amount of ozone, a flexible aeration system is developed, and the air aeration amount and the ozone aeration amount (the concentration of ozone is diluted and adjusted by the air amount provided by an air compressor) can be flexibly adjusted according to the inlet water quality condition. Specifically, when the COD of the inlet water is low, only air can be introduced, and the sewage is purified by air flotation; when the COD of the inlet water is higher, the ozone air input can be increased, and the COD removal effect is improved through catalytic oxidation of ozone.
In some embodiments, ozone distribution in N stages may be used, i.e. the ozone generator 21 is disposed at different heights of the catalytic oxidation reaction tank 31, so that the ozone is distributed more uniformly in the catalytic oxidation reaction tank 31. The first stage ozone is directly mixed with the sewage, and the sewage is subjected to air floatation separation and then passes through N-stage ozone distribution equipment to degrade pollutants in the sewage by using ozone.
In some embodiments, the micro-porous aerator 22 may be replaced with a dissolved air releaser disposed within the interior chamber of the catalytic oxidation reaction tank 31.
At least two catalytic oxidation layers 32 are sequentially arranged in the catalytic oxidation reaction tank 31 of the catalytic oxidation system 3 from top to bottom. The catalytic oxidation layer 32 is disposed on the upper portion of the micro-porous aerator 22. The catalytic oxidation layer 32 is sequentially marked as a first layer, a second layer, a third layer and the like from bottom to top.
The catalytic oxidation layer 32 includes a carrier and an active catalyst, and the active catalyst is supported on the carrier. The carrier is one or more of granular activated carbon, granular alumina and silicon-aluminum composite material; the active catalyst is typically one or more of Pt, Ni, Co, Mn and Cu metal ions. The preparation method of the active catalyst can be an impregnation method or a blending method. The catalytic oxidation layer 32 is made of large particles so that the pores are large enough for the residue in the sewage to pass through and float up continuously.
The different catalytic oxidation layers 32 may use the same active catalyst and carrier, or may use different active catalysts and carriers. The number of layers of the catalytic oxidation layer 32 may be specifically set according to actual conditions.
In the process that the sewage continuously rises, the sewage begins to contact different layers of the catalytic oxidation layer 32, a catalyst exists in the catalyst (the catalyst belongs to a heterogeneous catalyst in the reaction system), water and ozone in the dissolved air water undergo multi-step reactions to generate hydroxyl radicals with stronger oxidation than ozone (water molecules adsorbed on the surface of the catalyst are firstly dissociated into hydroxyl radicals and H, the hydroxyl radicals are combined with the catalyst to form Cat-OH, the H in the Cat-OH is easily captured by the ozone to form O 2 -OH intermediate, O 2 OH is further decomposed into oxygen and hydroxyl free radicals), and under the combined action of ozone and the hydroxyl free radicals, the oxidation reaction can be further accelerated, the efficient decomposition of soluble organic matters is realized, and the sewage is further treated.
The catalytic oxidation reaction tank 31 is provided with a catalytic oxidation layer 32 close to the water outlet end, so that redundant ozone can be treated, and the amount of ozone entering the atmosphere is reduced as much as possible.
The upper part of the catalytic oxidation reaction tank 31 is provided with a discharge system 4, the discharge system 4 comprises a water outlet pipe 41 and a slag discharge system, the treated sewage is discharged from the water outlet pipe 41, and the scum is discharged from the slag discharge system. The slag discharge system includes a dross tube 42 for discharging dross.
Specifically, the lift pump 12 pumps the sewage in the sewage tank 11 into the catalytic oxidation reaction tank 31, and can continuously raise the sewage level in the catalytic oxidation reaction tank 31 until the sewage level is raised to the pipe orifice of the water inlet end of the water outlet pipe 41. The distance between the liquid level in the catalytic oxidation reaction tank 31 and the top of the catalytic oxidation reaction tank is controlled by the water inlet system 1 and the water outlet pipe 41, and the distance can be freely adjusted according to different treated water qualities and water amounts. The water after the catalytic oxidation of ozone is discharged through the water outlet pipe 41, and the scum is discharged from the scum pipe 42 in a self-flowing manner after accumulating a certain amount.
The working principle of the sewage treatment system based on the integration of ozone catalytic oxidation and air floatation is as follows: the sewage and the chemical agent in the sewage tank 11 and the chemical dissolving tank 13 are pumped into the mixer 14 by the lifting pump 12, are mixed in the mixer 14, and react to perform primary treatment on the sewage. The primarily treated sewage enters the catalytic oxidation reaction tank 31 and continuously rises under the action of the lift pump 12. When the sewage contacts the microporous aerator 22, a large amount of highly dispersed micro-bubbles mixed by air and ozone released by the microporous aerator 22 are adhered to the surface of the hydrophobic substance on one hand, and the micro-bubbles and the substance form a whole body with density less than that of water and float on the water surface; on the other hand, when the microbubbles and the sewage generate air floatation reaction, ozone in the microbubbles and part of pollutants generate oxidation reaction. With the further rise of the sewage water level, the sewage begins to contact with different layers of the catalytic oxidation layer 32, in the presence of the catalyst, water and ozone in the dissolved air water undergo multi-step reactions to generate hydroxyl radicals with stronger oxidation than ozone (water molecules adsorbed on the surface of the catalyst are firstly dissociated into hydroxyl radicals and H, the hydroxyl radicals are combined with the catalyst to form Cat-OH, the H in the Cat-OH is easily captured by the ozone to form O 2 -OH intermediate, O 2 OH is further decomposed into oxygen and hydroxyl free radicals), and under the combined action of ozone and the hydroxyl free radicals, the oxidation reaction can be further accelerated, the efficient decomposition of organic matters is realized, and the sewage is further treated. The treated sewage is discharged from the water outlet pipe 41 when the water level of the treated sewage further rises, and the scum is accumulated by a certain amount and then discharged from the scum pipe 42 (switches of the parts are not shown in the figure).
The following description is made by using a plurality of embodiments for the sewage treatment system based on ozone catalytic oxidation and air flotation integration of the present invention.
Examples 1 to 5
The water quality condition of the sewage is as follows: the SS content is 500 mg/L; the COD content is 400 mg/L; the TP content was 4 mg/L. The carrier of the catalytic oxidation layer 32 is Al 2 O 3 The number of layers of the catalytic oxidation layer 32, the kind and amount of the active catalyst, and the treatment effect are shown in table 1.
TABLE 1 effects of treating wastewater in examples 1 to 5
As can be seen from Table 1, (1) the removal rate of COD in the system can be greatly improved by adopting the catalytic oxidation layer; (2) the concentration of active ions of the catalyst is increased, which is beneficial to improving the treatment effect of sewage; (3) the number of layers of the catalyst layer is increased, which is beneficial to improving the sewage treatment effect.
Examples 6 to 7
The water quality condition of the sewage is as follows: the SS content is 120 mg/L; the COD content is 150 mg/L; the TP content was 2 mg/L. The treatment was carried out without adding a catalyst and with a single catalytic treatment, and the treatment effects are shown in Table 2.
TABLE 2 effects of wastewater treatment in examples 6 to 7
As can be seen from Table 2, for the influent water with better water quality, (1) when no catalyst is used, a better treatment effect can be achieved only by the air flotation system; (2) when the catalyst is adopted, the sewage treatment effect can be further improved.
In summary, the utility model provides a sewage treatment system based on ozone catalytic oxidation and air floatation integration, which is provided with a plurality of catalytic oxidation layers, and can perform catalytic oxidation treatment on sewage for a plurality of times, thereby improving the sewage treatment effect; meanwhile, a plurality of catalytic oxidation layers are sequentially arranged in the catalytic oxidation reaction tank from top to bottom, and the whole sewage treatment process is carried out in one reaction tank; the device has more compact and simple structure and can be widely applied to the field of sewage treatment; the number of layers and the dosage of the catalytic oxidation layer can be freely adjusted according to the actual situation; the proportion of air and ozone can be freely adjusted according to the actual condition of sewage, and the method is particularly suitable for the CSO treatment field with large water quality fluctuation.
The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The utility model provides a sewage treatment system based on ozone catalytic oxidation air supporting integration which characterized in that: comprises a catalytic oxidation system (3), and a water inlet system (1) and an ozone air flotation system (2) which are respectively communicated with the catalytic oxidation system; the catalytic oxidation system (3) comprises a catalytic oxidation reaction tank (31) and at least two catalytic oxidation layers (32) which are sequentially arranged in the catalytic oxidation reaction tank (31) from top to bottom; the ozone air floatation system (2) comprises an ozone generator (21) and a microporous aerator (22) which is arranged in the catalytic oxidation reaction tank (31) and is positioned below the catalytic oxidation layer (32); the water inlet of the water inlet system (1) is positioned below the catalytic oxidation layer (32); ozone enters the catalytic oxidation reaction tank (31) through the microporous aerator (22), is mixed with sewage entering from the water inlet system (1) and then sequentially passes through each catalytic oxidation layer (32), and catalytic oxidation is completed while ozone is floated, so that sewage treatment is realized.
2. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 1, wherein: the catalytic oxidation layer (32) includes a carrier and an active catalyst supported on the carrier.
3. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 1, wherein: the ozone air flotation system (2) further comprises an air compressor (23), and the air compressor (23) and the ozone generator (21) respectively send air and ozone into the microporous aerator (22) at the same time and mix the air and the ozone in the microporous aerator (22).
4. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 1, wherein: and the upper part of the catalytic oxidation reaction tank (31) is provided with a discharge system (4) for discharging various substances obtained after sewage treatment.
5. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 4, wherein: the discharge system (4) comprises a water outlet pipe (41) and a slag discharge system, the treated sewage is discharged from the water outlet pipe (41), and the scum is discharged from the slag discharge system.
6. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 5, wherein: the slag discharge system includes a dross tube (42) for discharging dross.
7. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 1, wherein: the water inlet system (1) comprises a sewage tank (11) and a lifting pump (12) arranged at the water outlet end of the sewage tank (11), and the lifting pump (12) pumps sewage into the catalytic oxidation reaction tank (31).
8. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 7, wherein: the water inlet system (1) also comprises a medicine dissolving tank (13); the water outlet end of the medicine dissolving tank (13) is connected with the water inlet end of the lifting pump (12).
9. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 8, wherein: the water intake system (1) further comprises a mixer (14); the mixer (14) is connected to the water outlet end of the lift pump (12), and sewage and the medicament of the sewage tank (11) and the medicament dissolving tank (13) are pumped into the mixer (14) and mixed in the mixer (14).
10. The ozone catalytic oxidation air flotation integration-based sewage treatment system as claimed in claim 9, wherein: the mixer (14) is a tube mixer.
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