CN114906962A - Photoelectric synergistic catalytic oxidation treatment system and method for high-concentration organic wastewater - Google Patents
Photoelectric synergistic catalytic oxidation treatment system and method for high-concentration organic wastewater Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/5281—Installations for water purification using chemical agents
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- 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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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a photoelectric cooperative catalytic oxidation treatment system and method for high-concentration organic wastewater. The treatment system comprises a pretreatment water tank (1) for flocculating, settling, separating large particles in the wastewater and controlling the wastewater to flow uniformly, and a mixing starting area (2) for controlling the release of a catalyst carrier and fully mixing the catalyst and the wastewater; the photocatalytic reaction area (3) is used for enabling the wastewater to generate photocatalytic oxidation reaction through ultraviolet radiation and strengthening the synergistic reaction of the catalytic reaction; the electrochemical promotion area (4) is used for enabling the wastewater to generate electrochemical reaction, prolonging the reaction time and the number of rounds and improving the energy efficiency of degrading pollutants; the precipitation separation zone (5) is used for carrying out solid-liquid separation on the sewage precipitation of the photoelectric combined catalytic oxidation and sending the precipitated sludge to the catalyst regeneration system (7); and the catalyst cutoff area (6) is used for further cutting off, filtering and recovering the catalyst substances contained in the supernatant liquid after precipitation separation, and sending the backwashing sludge to the catalyst regeneration system (7).
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a photoelectric synergistic catalytic oxidation treatment system for high-concentration organic wastewater; in addition, the invention also relates to a photoelectric synergistic catalytic oxidation treatment method of the high-concentration organic wastewater.
Background
With the development of industry, the types and the discharge amount of environmental sewage are more and more, the components are more complex and changeable, and the environmental sewage contains various organic matters which are difficult to degrade, so that the environmental sewage has great harm to the environment and the human health. How to effectively treat high-concentration organic wastewater is a general problem in the chemical industry.
The COD concentration of effluent of main production sections of the high-concentration organic wastewater is generally more than 3000mg/L, and the effluent of some process sections can reach tens of thousands mg/L or even higher.
High-concentration organic wastewater often contains high-concentration biological refractory substances, and part of industrial wastewater is high in toxic and harmful substance content, complex in type and higher in treatment difficulty, for example, in typical coking wastewater, besides high-concentration ammonia nitrogen, phenol and phenol homologues, polycyclic compounds such as naphthalene, anthracene and benzopyrene, cyanide, sulfide, thiocyanide and the like are contained.
From the aspect of the drainage condition of a workshop, the water quality such as flow, concentration, components and the like of high-concentration organic wastewater can change and fluctuate along with the change of the production condition (production time, process, yield and the like) of the workshop, and indirect operation and staged production are adopted in some industrial production processes, so that the water quality of the discharged wastewater is extremely unstable, and more difficulty is brought to the subsequent treatment process.
For the treatment of high-concentration organic wastewater, the treatment price is far higher than that of domestic sewage, and the phenomena of stealing, draining, leaking and discharging are serious, thereby becoming a great difficulty in wastewater treatment.
With the gradual accumulation and progress of the wastewater treatment technology, the technology for treating high-concentration refractory organic wastewater by adopting the advanced oxidation technology has made certain progress, such as wet oxidation, photochemical oxidation, electrocatalytic oxidation and the like, which can generate strong oxidant hydroxyl radicals to rapidly and thoroughly degrade organic pollutants; the adsorption method and the membrane separation method have certain effects on the adsorption, separation and decoloration and permeability of organic matters and can effectively strengthen the removal of the organic matters, but the technologies have certain limitations and technical hardnesses. Whether the method can be used for treating the high organic wastewater or not is based on the characteristics of the high organic wastewater, and a synergistic effect is formed by adopting the combined application of a plurality of wastewater treatment technologies, so that the treatment effect of the wastewater is enhanced, and the method is still in an exploration research stage at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a photoelectric synergistic catalytic oxidation treatment system for high-concentration organic wastewater, which is particularly suitable for physicochemical link treatment and emergency treatment of high-organic wastewater containing phenols, PAHS, quinolines and organic nitriles in the coking industry.
In addition, the invention also provides a photoelectric synergistic catalytic oxidation treatment method of the high-concentration organic wastewater.
The photoelectric synergistic catalytic oxidation treatment system for the high-concentration organic wastewater adopts the technical scheme that: the photoelectric synergistic catalytic oxidation treatment system for the high-concentration organic wastewater comprises a pretreatment water pool, a mixed starting area, a photocatalytic reaction area, an electrochemical promotion area, a precipitation separation area and a catalyst intercepting area; the pretreatment water tank is used for flocculating, precipitating and separating large particles in the wastewater and controlling the wastewater to flow uniformly; the mixed starting area is used for controlling the release of the catalyst carrier, fully mixing the catalyst and the wastewater and starting the catalytic reaction; the photocatalytic reaction area is used for enabling the wastewater to generate photocatalytic oxidation reaction through ultraviolet radiation and strengthening the cooperative operation of the catalytic reaction; the electrochemical promoting area is used for enabling the wastewater to generate an electrochemical reaction, strengthening further reaction optimization of an intermediate product generated by photocatalytic oxidation, balancing a photocatalytic oxidation intermediate chain, prolonging the reaction time and the number of rounds, and improving the energy efficiency of degrading pollutants; the precipitation separation zone is used for performing precipitation solid-liquid separation on the sewage subjected to photoelectric combined catalytic oxidation, so that the effluent quality is improved, the influence on subsequent advanced treatment is reduced, and the precipitated sludge is sent to a catalyst regeneration system to recover catalyst substances for regeneration and reuse; the catalyst intercepting area is used for further intercepting and filtering catalyst substances contained in the supernatant liquid obtained by precipitation separation, fully recovering the catalyst substances, improving the quality of effluent water, reducing the influence on subsequent advanced treatment, and sending backwashing sludge to a catalyst regeneration system so as to recover the catalyst substances for regeneration and reuse.
Optionally, the pretreatment water tank comprises a first-stage flocculation sedimentation tank and a regulating tank.
Optionally, the pretreatment water tank is connected with the mixing starting zone through a quantitative lift pump; and a first COD online monitoring device and a second COD online monitoring device are respectively arranged at the water inlet of the mixed starting area and the water outlet of the catalyst intercepting area.
Optionally, mix the start-up area and include at least one catalyst carrier releaser, stirring motor, at least one rotation mobile jib, catalyst carrier releaser is cylindricly, catalyst, outer courage filling carrier as the catalyst are filled to the inner bag of catalyst carrier releaser, through the release rate of catalyst to waste water is adjusted to the concentration difference and the permeability index adjustment of carrier and waste water, stirring motor passes through drive chain and runner drive it rotates to rotate the mobile jib, be equipped with the stirring leaf on the rotation mobile jib, be used for circulation rivers about catalyst carrier releaser peripheral formation promote the intensive mixing of catalyst and waste water, and the while is mixed liquid concentration steadily, ensures the even release of catalyst.
Optionally, the rotating directions of the stirring blades on the same rotating main rod are the same, and the rotating directions of the stirring blades on different rotating main rods are the same or different.
Optionally, each catalyst carrier releaser is connected with a resting potential instrument and a concentration difference sensor.
Optionally, the mixing starting area is further provided with a first pH and ORP online monitoring device.
Optionally, the photocatalytic reaction area comprises a reciprocating motor, a power frame and a reciprocating moving assembly, the reciprocating motor drives the power frame and the reciprocating moving assembly to reciprocate through rollers, and an ultraviolet lamp is arranged on the reciprocating moving assembly.
Optionally, the electrochemical promoting area includes an electro-catalytic power supply device, at least one set of electrochemical electrode plate, an aeration device, and a first blower for providing air, oxygen, and nitrogen for the aeration device, the electro-catalytic power supply device is used for supplying power to the electrochemical electrode plate, the aeration device is used for supplying oxygen and stirring, the flow of mixed liquid water is strengthened, and the reaction efficiency is increased.
Optionally, the electrochemical promotion region further comprises a circulating mixing pump, the circulating mixing pump and a circulating pipeline thereof are introduced into the photocatalytic reaction region, an intermediate of the electrochemical catalytic reaction is refluxed into the photocatalytic reaction region, and the catalytic efficiency and the reaction thoroughness of the small molecular substance are enhanced through the circulating treatment of ultraviolet light catalysis.
Optionally, the electrochemical promotion zone is provided with pH, temperature and ORP on-line monitoring devices.
Optionally, a baffling water distribution plate is arranged at the upper part in the precipitation separation area corresponding to a water inlet flowing from the electrochemical promotion area, a scum baffle is arranged at a water outlet flowing to the catalyst interception area, a sedimentation mud bucket is arranged at the lower part of the precipitation separation area, and a mud outlet of the sedimentation mud bucket is connected to the catalyst regeneration system through a mud pipeline.
Optionally, the catalyst intercepting zone comprises a cross rope adsorption filler, a flexible filter material filler, a deflection baffle and a second air blower, the deflection baffle divides the catalyst intercepting zone into an upper part and a middle part to form a reaction zone and a water outlet zone, the cross rope adsorption filler and the flexible filter material filler are respectively positioned above and below the reaction zone, the cross rope adsorption filler is fixed through a filler hanging layer, a rotary water distributor is arranged in a space above the cross rope adsorption filler, and a water outlet of the precipitation separation zone is communicated to the upper part of the rotary water distributor; a first backwashing gas supply layer and a second backwashing gas supply layer are respectively arranged below the fork rope adsorption filler and the flexible filter material filler; the second air blower is used for providing air for the first backwashing air supply layer and the second backwashing air supply layer; backwashing sludge settling generated in the catalyst interception area is connected into a sludge pipeline through a bottom outlet and then is connected into a catalyst regeneration system; and the catalyst cutoff region is provided with a second pH and ORP on-line monitoring device.
The photoelectric synergistic catalytic oxidation treatment method for the high-concentration organic wastewater adopts the technical scheme that: the photoelectric cooperative catalytic oxidation treatment method of the high-concentration organic wastewater comprises the following steps:
(S1) pretreating the high-concentration organic wastewater, and separating large particles in the wastewater through flocculation and precipitation, so that the blocking effect on catalytic reaction is avoided, and the waste of a catalyst is reduced; the water is controlled to flow uniformly through the regulating reservoir, so that the load impact on the system is reduced;
(S2) controlling the release of the catalyst carrier according to the water inlet condition, fully mixing the catalyst and the wastewater, and starting the catalytic reaction;
(S3) carrying out photocatalytic oxidation reaction on the wastewater through ultraviolet radiation, and strengthening the cooperative operation of the catalytic reaction;
(S4) enabling the wastewater to generate an electrochemical reaction, strengthening further reaction optimization of an intermediate product generated by photocatalytic oxidation, balancing a photocatalytic oxidation intermediate chain, prolonging the reaction time and the number of rounds, and improving the energy efficiency of degrading pollutants;
(S5) carrying out precipitation solid-liquid separation on the photoelectricity combined catalytic oxidation sewage, improving the effluent quality, reducing the influence on the subsequent advanced treatment, and sending the precipitated sludge to a catalyst regeneration system to recover catalyst substances for regeneration and reuse;
(S6) the catalyst substance contained in the supernatant fluid of the precipitation separation is further intercepted and filtered, the catalyst substance is fully recovered, the water quality of the effluent is improved, the influence on the subsequent advanced treatment is reduced, and the backwashing sludge is sent to a catalyst regeneration system to recover the catalyst substance for regeneration and reuse.
Optionally, the step (S4) further includes:
(S41) refluxing the intermediate of the electrochemical catalytic reaction to the step (S3) through a circulating mixing pump and a circulating pipeline thereof, circulating the reaction mixed liquid of photocatalysis and electrochemistry, promoting the cooperative development of each catalytic oxidation link, improving the purification efficiency, and enhancing the catalytic efficiency of the micromolecule substances and the thoroughness of the reaction through the circulating treatment of ultraviolet photocatalysis.
The invention has the beneficial effects that: the photoelectricity collaborative catalytic oxidation treatment system for the high-concentration organic wastewater comprises a pretreatment water pool, a mixed starting area, a photocatalysis reaction area, an electrochemical promotion area, a precipitation separation area and a catalyst intercepting area; the pretreatment water tank is used for flocculating, precipitating and separating large particles in the wastewater and controlling the wastewater to flow uniformly; the mixed starting area is used for controlling the release of the catalyst carrier, fully mixing the catalyst and the wastewater and starting the catalytic reaction; the photocatalytic reaction area is used for enabling the wastewater to generate photocatalytic oxidation reaction through ultraviolet radiation and strengthening the cooperative operation of the catalytic reaction; the electrochemical promoting area is used for enabling the wastewater to generate an electrochemical reaction, strengthening further reaction optimization of an intermediate product generated by photocatalytic oxidation, balancing a photocatalytic oxidation intermediate chain, prolonging reaction time and the number of rounds, and improving the energy efficiency of degrading pollutants; the precipitation separation zone is used for performing precipitation solid-liquid separation on the sewage subjected to photoelectric combined catalytic oxidation, improving the quality of effluent, reducing the influence on subsequent advanced treatment, and sending the precipitated sludge to a catalyst regeneration system to recover catalyst substances for regeneration and reuse; the catalyst interception area is used for further intercepting and filtering catalyst substances contained in the supernatant liquid obtained by precipitation separation, fully recovering the catalyst substances, improving the quality of effluent water, reducing the influence on subsequent advanced treatment, and sending backwashing sludge to a catalyst regeneration system so as to recover the catalyst substances for regeneration and reuse; the photoelectricity collaborative catalytic oxidation treatment system for the high-concentration organic wastewater overcomes the defects and shortcomings of the prior art, is suitable for treatment of difficultly-degraded wastewater with high organic pollution, particularly physicochemical link treatment and emergency treatment of high-organic-matter wastewater containing phenols, PAHS, quinolines and organic nitriles in the coking industry, and has the following obvious advantages: (1) the photocatalytic oxidation and electrochemical oxidation treatment technologies are combined and integrated, and meanwhile, a backflow system is additionally arranged to form a photoelectric combined catalytic reaction system, so that engineering installation and implementation and rapid emergency starting are facilitated; (2) the fusion rate of the photocatalyst and the wastewater is controlled by the catalyst carrier releaser, and the fusion efficiency is enhanced by the arrangement of the circulating stirring system, so that the photocatalytic reaction of the wastewater is further enhanced; (3) through buffering precipitation and catalyst interception, the photocatalyst material is reasonably recovered, the photocatalyst loss is reduced, and the engineering operation cost is saved.
Similarly, the photoelectric synergistic catalytic oxidation treatment method for the high-concentration organic wastewater has the beneficial effects on the photoelectric synergistic catalytic oxidation treatment of the high-concentration organic wastewater.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a photoelectrocatalysis oxidation treatment system for high-concentration organic wastewater according to an embodiment of the invention;
FIG. 2 is a schematic structural view of a photocatalytic reaction zone according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for treating high-concentration organic wastewater by photoelectricity-concerted catalytic oxidation according to an embodiment of the invention.
Detailed Description
As shown in fig. 1 and fig. 2, the system for photoelectricity-concerted catalytic oxidation treatment of high-concentration organic wastewater in this embodiment includes a pretreatment water tank 1, a mixing start-up zone 2, a photocatalytic reaction zone 3, an electrochemical promotion zone 4, a precipitation separation zone 5, and a catalyst cutoff zone 6; the pretreatment water tank 1 is used for flocculating, precipitating and separating large particles in the wastewater and controlling the wastewater to flow uniformly; the mixed starting area 2 is used for controlling the release of the catalyst carrier, fully mixing the catalyst and the wastewater and starting the catalytic reaction; the photocatalytic reaction area 3 is used for enabling wastewater to generate photocatalytic oxidation reaction through ultraviolet radiation and strengthening the cooperative operation of the catalytic reaction; the electrochemical promotion area 4 is used for enabling the wastewater to generate an electrochemical reaction, strengthening further reaction optimization of an intermediate product generated by photocatalytic oxidation, balancing an intermediate chain of the photocatalytic oxidation, prolonging the reaction time and the number of rounds, and improving the energy efficiency of degrading pollutants; the precipitation separation zone 5 is used for performing precipitation solid-liquid separation on the sewage subjected to photoelectric combined catalytic oxidation, improving the quality of effluent, reducing the influence on subsequent advanced treatment, and sending precipitated sludge to a catalyst regeneration system 7 so as to recover catalyst substances for regeneration and reuse; the catalyst intercepting area 6 is used for further intercepting and filtering catalyst substances contained in the supernatant liquid after precipitation separation, fully recovering the catalyst substances, improving the water quality of effluent, reducing the influence on subsequent advanced treatment, and sending backwashing sludge to a catalyst regeneration system 7 so as to recover the catalyst substances for regeneration and reuse.
Specifically, the pretreatment water tank 1 comprises a primary flocculation sedimentation tank and an adjusting tank, and in order to ensure that the system inlet water meets the basic requirements of the reaction, large particles in the wastewater are separated through flocculation sedimentation in the primary flocculation sedimentation tank, so that the blocking effect on the catalytic reaction is avoided, and the waste of the catalyst is reduced; the uniform inflow of water is controlled by the regulating reservoir, so that the stability of the operation condition of the whole system is facilitated, and the load impact on the system is reduced; the pretreatment tank 1 can also protect the service life of system equipment. The pretreatment water tank 1 is connected with the mixing starting zone 2 through a quantitative lifting pump 81 so as to convey wastewater to the mixing starting zone 2; a first COD online monitoring device 11 and a second COD online monitoring device 69 are respectively arranged at the water inlet of the mixed starting area 2 and the water outlet of the catalyst flow-intercepting area 6 and are respectively used for monitoring the water inlet COD value and the water outlet end COD value, the purification energy efficiency and the working efficiency of the integrated equipment system are periodically evaluated, and the maintenance and the upkeep of the system are judged according to the effective removal rate of COD.
Mix start-up area 2 through the adjustment to regional reaction condition, according to the release of the condition control catalyst carrier of intaking, the homogeneity of intensive mixing catalyst and waste water starts catalytic reaction's going on, including two catalyst carrier releasers 21, stirring motor 24, three rotation mobile jib 26, catalyst carrier releaser 21 is cylindricly, catalyst 22, outer courage that catalyst 22, outer courage as the catalyst are filled to catalyst carrier releaser 21's inner bag, through the release rate of catalyst 22 to waste water is adjusted to the concentration difference of carrier 23 and waste water and permeability index regulation, ensures the reasonable volume of throwing in of catalyst, stirring motor 24 passes through drive chain and runner 25 and drives it rotates mobile jib 26, be equipped with stirring leaf 27 on the rotating mobile jib 26, be used for peripheral circulation rivers about forming of catalyst carrier releaser 21 promote the intensive mixing of catalyst and waste water, meanwhile, the concentration of the mixed liquid is stabilized, uniform release of the catalyst is ensured, the rotating directions of the stirring blades 27 on the same rotating main rod 26 are the same, the rotating directions of the stirring blades 27 on different rotating main rods 26 are the same or different, specifically, the rotating directions of the stirring blades 27 on two rotating main rods 26 positioned on two sides are downward, the rotating direction of the stirring blade 27 on one rotating main rod 26 positioned in the middle is upward, and a strong up-and-down circulating flow is favorably formed on the edge of the catalyst carrier releaser 21; each catalyst carrier releaser 21 is connected with a resting potential meter 210 and a concentration difference sensor 28, the concentration difference sensor 28 monitors the concentration difference and the permeability index of the catalyst in the mixed liquid inside the catalyst carrier releaser 21 and in the mixed starting area 2, the signals of the concentration difference and the permeability index are fed back to the resting potential meter 210, the working potential of the catalyst carrier releaser 21 is controlled by the resting potential meter 210, the permeability of the catalyst carrier releaser 21 is further controlled, and the release rate of the catalyst is finally controlled; the mixed starting zone 2 is also provided with a first pH and ORP on-line monitoring device 29 for monitoring the electrochemical reaction conditions.
The photocatalytic reaction zone 3 comprises a reciprocating motor 31, a power frame 32 and a reciprocating moving assembly 34, the reciprocating motor 31 drives the power frame 32 and the reciprocating moving assembly 34 to reciprocate through a roller 33, an ultraviolet lamp 35 is arranged on the reciprocating moving assembly 34, the cooperation of catalytic reaction is strengthened through the light radiation of the lamp 35, a reciprocating movable assembly is arranged, a whole radiation unit can integrally move, and the flowing and light-water contact of wastewater are strengthened; a certain scouring effect can be formed by reciprocating motion, surface scouring of the ultraviolet lamp 35 is properly completed, adhesion of the surface of the ultraviolet lamp 35 is reduced, and lamp tube cleaning frequency and washing maintenance are reduced.
The electrochemical promoting area 4 comprises an electro-catalytic power supply device 41, a plurality of groups of electrochemical plates 42, an aeration device 43, and a first blower 44 for providing air, oxygen, and nitrogen for the aeration device 43, the electro-catalytic power supply device 41 is used for supplying power to the electrochemical plates 42, the aeration device 43 is used for supplying oxygen and stirring, strengthening the flow of the mixed liquid water body and increasing the reaction efficiency, the plurality of groups of electrochemical plates 42 are used for strengthening the electrochemical reaction of the wastewater in the unit, increasing the dissolved oxygen of the mixed liquid, strengthening the conversion of holes and photoelectrons, strengthening the comprehensive reaction performance of electrochemistry and photocatalysis, assisting aeration, oxygen supply, and stirring and scouring, strengthening the further reaction optimization of the intermediate products generated by photocatalytic oxidation, developing new chemical reaction through electrochemical logic, and balancing the intermediate chain of photocatalytic oxidation, the reaction time and the number of rounds are prolonged, and the energy efficiency of degrading pollutants is improved systematically.
Further, the electrochemical promotion area 4 further comprises a circulating mixing pump 82, the circulating mixing pump 82 and a circulating pipeline thereof are introduced into the photocatalytic reaction area 3, an intermediate of the electrochemical catalytic reaction flows back into the photocatalytic reaction area 3, the catalytic efficiency and the reaction thoroughness of the small molecular substances are enhanced through the circulating treatment of ultraviolet light catalysis, the reaction mixed liquid of the photocatalysis and the electrochemistry is circulated, the cooperative development of each catalytic oxidation link is promoted, and the purification efficiency is improved in order of magnitude; in addition, the circulating mixing pump 82 can also form certain stirring and flow pushing effects on the mixed liquid under the power action of water flow, and meanwhile, the hydraulic effect on the surface of the ultraviolet lamp 35 is strengthened, so that the pollution caused by the adhesion of the surface of the lamp light is reduced; the electrochemical promotion area 4 is provided with an online pH, temperature and ORP monitoring device 45 for monitoring the electrochemical reaction conditions.
The upper part in the precipitation separation zone 5 is provided with a baffling water distribution plate 51 corresponding to a water inlet flowing from the electrochemical promotion zone 4, a scum baffle plate 53 corresponding to a water outlet flowing to the catalyst interception zone 6, the lower part of the precipitation separation zone 5 is provided with a precipitation hopper 52, a sludge outlet of the precipitation hopper 52 is connected to the catalyst regeneration system 7 through a sludge pipeline 71, and a conventional advection type precipitation device is adopted to carry out preliminary solid-liquid separation on sludge-water mixed liquid of the photoelectric combined catalytic oxidation reaction, comprehensively recover catalyst substances in the precipitated sludge, improve the water quality effect of effluent and reduce the influence on subsequent deep treatment.
The catalyst intercepting region 6 comprises a cross rope adsorption filler 61, a flexible filter material filler 62, a deflection baffle 67 and a second air blower 9, the deflection baffle 67 divides the catalyst intercepting region 6 into a reaction region and a water outlet region at the upper part and the middle part, the cross rope adsorption filler 61 and the flexible filter material filler 62 are respectively positioned above and below the reaction region, the cross rope adsorption filler 61 and the flexible filter material filler 62 both adopt frame structures, are convenient to place and are also convenient to be lifted out through machinery for regeneration and cleaning, the cross rope adsorption filler 61 is fixed through a filler hanging layer 63, a rotary water distributor 64 is arranged in the space above the cross rope adsorption filler 61, the water outlet of the precipitation separation region 5 is communicated to the upper part of the rotary water distributor 64 to carry out rotary uniform water distribution on precipitated water to the filler intercepting layer, and the residual large-particle catalyst substances in the mixed solution are adsorbed and intercepted by the cross rope adsorption filler 61, simultaneously buffering hydraulic plug flow; the residual small-particle catalyst substances in the mixed solution are further intercepted and filtered by the flexible filter material filler 62, so that the recycling of the catalyst is enhanced; a first backwashing gas supply layer 65 and a second backwashing gas supply layer 66 are respectively arranged below the forking rope adsorption packing 61 and the flexible filter material packing 62 and are respectively used for carrying out regular backwashing and stirring washing on-line cleaning on the forking rope adsorption packing 61 and the flexible filter material packing 62; the second air blower 9 is used for providing air for the first backwashing air supply layer 65 and the second backwashing air supply layer 66, and is used for the aeration function of the electrochemical promotion zone 4 and the backwashing and regeneration cleaning function of the catalyst flow-intercepting zone 6; backwashing sludge generated by the catalyst flow-intercepting region 6 is connected into a sludge pipeline 71 through a bottom outlet and then is connected into a catalyst regeneration system 7; the catalyst cutoff zone 6 is provided with a second pH and ORP on-line monitoring device 68; the catalyst intercepting area 6 is used for further intercepting and filtering the catalyst substances contained in the supernatant liquid after precipitation and separation, so that high catalyst substances are fully recovered, the operation cost is saved, the effluent quality effect is improved, and the influence on subsequent advanced treatment is reduced.
And the muddy water generated by backwashing and regeneration cleaning of the precipitation separation zone 5 and the catalyst intercepting zone 6 is uniformly collected to a catalyst regeneration system 7, so that the regeneration and resource utilization of the catalyst are enhanced.
Comparative laboratory test parameters for 4h degradation rate for treatment of four dye wastewaters in this example are as follows:
according to the test data, the photoelectric synergistic catalytic oxidation treatment system for the high-concentration organic wastewater provided by the invention has the advantage that the degradation efficiency is obviously improved.
The specific engineering application cases are as follows: the photoelectric synergetic catalytic oxidation treatment system for high-concentration organic wastewater of the embodiment is applied to the front end of the recycling engineering of coking wastewater of certain coking plant in Shanxi province, the effective operation of a biochemical system is pretreated, and the water quality of inlet and outlet water of the system is compared with the advanced catalytic oxidation mode before the embodiment, so that the parameters are as follows:
as can be seen from the specific cases, the photoelectric synergistic catalytic oxidation treatment system for high-concentration organic wastewater provided by the invention can be used for obviously improving the effluent quality and the removal rate.
It should be noted that, according to actual needs, a person skilled in the art may set necessary connection components for the connections between the modules, devices, assemblies, units, parts, and the like, or may appropriately adjust the number of the components, which is not described herein again, and in this embodiment, the number of the catalyst carrier releaser 21, the rotating main rod 26, the stirring blades 27, and the electrochemical plates 42 may be adjusted according to actual specific needs.
As shown in fig. 3, the method for treating high-concentration organic wastewater by photoelectricity-concerted catalytic oxidation according to the embodiment includes the following steps:
(S1) pretreating the high-concentration organic wastewater, and separating large particles in the wastewater through flocculation and precipitation, so that the blocking effect on catalytic reaction is avoided, and the waste of a catalyst is reduced; the water is controlled to flow uniformly through the regulating reservoir, so that the load impact on the system is reduced;
(S2) controlling the release of the catalyst carrier according to the water inlet condition, fully mixing the catalyst and the wastewater, and starting the catalytic reaction;
(S3) carrying out photocatalytic oxidation reaction on the wastewater through ultraviolet radiation, and strengthening the cooperative operation of the catalytic reaction;
(S4) enabling the wastewater to generate an electrochemical reaction, strengthening further reaction optimization of an intermediate product generated by photocatalytic oxidation, balancing a photocatalytic oxidation intermediate chain, prolonging the reaction time and the number of rounds, and improving the energy efficiency of degrading pollutants;
(S5) carrying out precipitation solid-liquid separation on the photoelectricity combined catalytic oxidation sewage, improving the effluent quality, reducing the influence on the subsequent advanced treatment, and sending the precipitated sludge to a catalyst regeneration system 7 to recover catalyst substances for regeneration and reuse;
(S6) the catalyst substance contained in the supernatant fluid of the precipitation separation is further intercepted and filtered, the catalyst substance is fully recovered, the water quality of the effluent is improved, the influence on the subsequent advanced treatment is reduced, and the backwashing sludge is sent to a catalyst regeneration system 7 to recover the catalyst substance for regeneration and reuse.
Further, the step (S4) further includes:
(S41) refluxing the intermediate of the electrochemical catalytic reaction to the step (S3) through the circulating mixing pump 82 and the circulating pipeline thereof, circulating the reaction mixed liquid of photocatalysis and electrochemistry, promoting the cooperative development of each catalytic oxidation link, improving the purification efficiency, and enhancing the catalytic efficiency and the reaction thoroughness of the micromolecule substances through the circulating treatment of ultraviolet photocatalysis.
The above examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention.
The photoelectric synergistic catalytic oxidation treatment system for high-concentration organic wastewater overcomes the defects and shortcomings of the prior art, is suitable for treating the hardly degradable wastewater with high organic pollution, particularly for the physicochemical link treatment and emergency treatment of the high-organic-substance wastewater containing phenols, PAHS, quinolines and organic nitriles in the coking industry, and has the following obvious advantages:
(1) the photocatalytic oxidation and electrochemical oxidation treatment technologies are combined and integrated, and meanwhile, a backflow system is additionally arranged to form a photoelectric combined catalytic reaction system, so that engineering installation and implementation and rapid emergency starting are facilitated;
(2) the fusion rate of the photocatalyst and the wastewater is controlled by the catalyst carrier releaser, and the fusion efficiency is enhanced by the arrangement of the circulating stirring system, so that the photocatalytic reaction of the wastewater is further enhanced;
(3) through buffering precipitation and catalyst interception, the photocatalyst material is reasonably recovered, the photocatalyst loss is reduced, and the engineering operation cost is saved.
Similarly, the photoelectric synergistic catalytic oxidation treatment method for the high-concentration organic wastewater has the beneficial effects on the photoelectric synergistic catalytic oxidation treatment of the high-concentration organic wastewater.
The invention can be widely applied to the field of organic wastewater treatment.
Claims (10)
1. The utility model provides a photoelectricity is catalytic oxidation processing system in coordination of high concentration organic waste water which characterized in that: comprises a pretreatment water pool (1), a mixed starting area (2), a photocatalytic reaction area (3), an electrochemical promotion area (4), a precipitation separation area (5) and a catalyst cutoff area (6); the pretreatment water tank (1) is used for flocculating, precipitating and separating large particles in the wastewater and controlling the wastewater to flow uniformly; the mixed starting area (2) is used for controlling the release of the catalyst carrier, fully mixing the catalyst and the wastewater and starting the catalytic reaction; the photocatalytic reaction area (3) is used for enabling wastewater to generate photocatalytic oxidation reaction through ultraviolet radiation and strengthening the cooperative operation of the catalytic reaction; the electrochemical promotion area (4) is used for enabling the wastewater to generate an electrochemical reaction, strengthening further reaction optimization of an intermediate product generated by photocatalytic oxidation, balancing a photocatalytic oxidation intermediate chain, prolonging reaction time and the number of rounds, and improving the energy efficiency of degrading pollutants; the precipitation separation zone (5) is used for performing precipitation solid-liquid separation on the sewage subjected to photoelectric combined catalytic oxidation, improving the quality of effluent, reducing the influence on subsequent advanced treatment, and sending the precipitated sludge to a catalyst regeneration system (7) to recover catalyst substances for regeneration and reuse; the catalyst intercepting area (6) is used for further intercepting and filtering catalyst substances contained in the supernatant liquid after precipitation separation, fully recovering the catalyst substances, improving the water quality of effluent, reducing the influence on subsequent advanced treatment, and sending backwashing sludge to a catalyst regeneration system (7) so as to recover the catalyst substances for regeneration and reuse.
2. The photoelectricity concerted catalytic oxidation processing system of high concentration organic waste water of claim 1 characterized in that: the pretreatment water tank (1) comprises a primary flocculation sedimentation tank and an adjusting tank; the pretreatment water pool (1) is connected with the mixed starting area (2) through a quantitative lift pump (81), the water inlet of the mixed starting area (2) and the water outlet of the catalyst intercepting area (6) are respectively provided with a first COD online monitoring device (11) and a second COD online monitoring device (69).
3. The photoelectricity concerted catalytic oxidation processing system of high concentration organic waste water of claim 1 characterized in that: the mixed starting area (2) comprises at least one catalyst carrier releaser (21), a stirring motor (24) and at least one rotating main rod (26), the catalyst carrier releaser (21) is cylindrical, the inner container of the catalyst carrier releaser (21) is filled with a catalyst (22) used as a catalyst and an outer container filling carrier (23), the release rate of the catalyst (22) to the wastewater is adjusted and regulated through the concentration difference between the carrier (23) and the wastewater and the permeability index, the stirring motor (24) drives the rotating main rod (26) to rotate through a transmission chain and a rotating wheel (25), the rotating main rod (26) is provided with a stirring blade (27), the device is used for forming up-and-down circulating water flow at the periphery of the catalyst carrier releaser (21), promoting the full mixing of the catalyst and the wastewater, stabilizing the concentration of the mixed liquid and ensuring the uniform release of the catalyst; the rotating directions of the stirring blades (27) on the same rotating main rod (26) are the same, and the rotating directions of the stirring blades (27) on different rotating main rods (26) are the same or different; each catalyst carrier releaser (21) is connected with a resting potentiometer (210) and a concentration difference sensor (28); the mixed starting area (2) is also provided with a first pH and ORP on-line monitoring device (29).
4. The photoelectricity concerted catalytic oxidation processing system of high concentration organic waste water of claim 1 characterized in that: the photocatalysis reaction area (3) comprises a reciprocating motor (31), a power frame (32) and a reciprocating moving assembly (34), wherein the reciprocating motor (31) drives the power frame (32) and the reciprocating moving assembly (34) to reciprocate through a roller (33), and an ultraviolet lamp (35) is arranged on the reciprocating moving assembly (34).
5. The photoelectricity concerted catalytic oxidation processing system of high concentration organic waste water of claim 1 characterized in that: the electrochemical promotion area (4) comprises an electrocatalysis power supply device (41), at least one group of electrochemical pole plates (42), an aeration device (43) and a first air blower (44) for providing air, oxygen and nitrogen for the aeration device (43), the electrocatalysis power supply device (41) is used for supplying power for the electrochemical pole plates (42), the aeration device (43) is used for supplying oxygen and stirring, the flow of mixed liquid water is strengthened, and the reaction efficiency is increased.
6. The photoelectricity concerted catalytic oxidation processing system of high concentration organic waste water of claim 5 characterized in that: the electrochemical promotion region (4) also comprises a circulating mixing pump (82), the circulating mixing pump (82) and a circulating pipeline thereof are introduced into the photocatalytic reaction region (3), an intermediate of the electrochemical catalytic reaction is refluxed into the photocatalytic reaction region (3), and the catalytic efficiency of the micromolecular substances and the thoroughness of the reaction are enhanced through the circulating treatment of ultraviolet catalysis; the electrochemical promotion area (4) is provided with an online pH, temperature and ORP monitoring device (45).
7. The photoelectricity concerted catalytic oxidation processing system of high concentration organic waste water of claim 1 characterized in that: the upper portion is equipped with baffling water distributor (51) corresponding to the water inlet that flows in from electrochemistry promotion district (4) in precipitation separation district (5), is equipped with dross baffle (53) corresponding to the water outlet that flows to catalyst cross-flow district (6), the lower part of precipitation separation district (5) is equipped with subsides bagger (52), the mud outlet of subsides bagger (52) passes through mud pipeline (71) and inserts catalyst regeneration system.
8. The photoelectricity concerted catalytic oxidation processing system of high concentration organic waste water of claim 7 characterized in that: the catalyst intercepting region (6) comprises a cross rope adsorption filler (61), a flexible filter material filler (62), a deflection baffle (67) and a second air blower (9), the deflection baffle (67) divides the upper part and the middle part of the catalyst intercepting region (6) into a reaction region and a water outlet region, the cross rope adsorption filler (61) and the flexible filter material filler (62) are respectively positioned above and below the reaction region, the cross rope adsorption filler (61) is fixed through a filler hanging layer (63), a rotary water distributor (64) is arranged in a space above the cross rope adsorption filler (61), and a water outlet of the precipitation separation region (5) is communicated to the upper part of the rotary water distributor (64); a first backwashing air supply layer (65) and a second backwashing air supply layer (66) are respectively arranged below the fork rope adsorption filler (61) and the flexible filter material filler (62); the second air blower (9) is used for providing air for the first backwashing air supply layer (65) and the second backwashing air supply layer (66); backwashing sludge generated by the catalyst flow-intercepting region (6) is connected into a sludge pipeline (71) through a bottom outlet and then is connected into a catalyst regeneration system; the catalyst cutoff zone (6) is provided with a second pH and ORP on-line monitoring device (68).
9. A photoelectric synergistic catalytic oxidation treatment method for high-concentration organic wastewater is characterized by comprising the following steps: the method comprises the following steps:
(S1) pretreating the high-concentration organic wastewater, and separating large particles in the wastewater through flocculation and precipitation, so that the blocking effect on catalytic reaction is avoided, and the waste of a catalyst is reduced; the water is controlled to flow uniformly through the regulating reservoir, so that the load impact on the system is reduced;
(S2) controlling the release of the catalyst carrier according to the water inlet condition, fully mixing the catalyst and the wastewater, and starting the catalytic reaction;
(S3) carrying out photocatalytic oxidation reaction on the wastewater through ultraviolet radiation, and strengthening the cooperative operation of the catalytic reaction;
(S4) enabling the wastewater to generate an electrochemical reaction, strengthening further reaction optimization of an intermediate product generated by photocatalytic oxidation, balancing a photocatalytic oxidation intermediate chain, prolonging the reaction time and the number of rounds, and improving the energy efficiency of degrading pollutants;
(S5) carrying out precipitation solid-liquid separation on the photoelectricity combined catalytic oxidation sewage, improving the effluent quality, reducing the influence on the subsequent advanced treatment, and sending the precipitated sludge to a catalyst regeneration system (7) to recover catalyst substances for regeneration and reuse;
(S6) the catalyst substance contained in the supernatant fluid of the precipitation separation is further intercepted and filtered, the catalyst substance is fully recovered, the water quality of the effluent is improved, the influence on the subsequent advanced treatment is reduced, and the backwashing sludge is sent to a catalyst regeneration system (7) to recover the catalyst substance for regeneration.
10. The photoelectricity concerted catalytic oxidation treatment method of high concentration organic wastewater according to claim 9, characterized in that: the step (S4) further includes:
(S41) refluxing the intermediate of the electrochemical catalytic reaction to the step (S3) through a circulating mixing pump (82) and a circulating pipeline thereof, circulating the reaction mixed liquid of photocatalysis and electrochemistry, promoting the cooperative development of each catalytic oxidation link, improving the purification efficiency, and enhancing the catalytic efficiency and the reaction thoroughness of the small molecular substances through the circulating treatment of ultraviolet photocatalysis.
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| CN116730538A (en) * | 2023-06-25 | 2023-09-12 | 广东威特雅环境科技有限公司 | Method and system for degrading pollutants in phenolic resin synthetic wastewater |
| CN116891320A (en) * | 2023-07-20 | 2023-10-17 | 广东威特雅环境科技有限公司 | Shale gas exploitation fracturing flow-back wastewater pollutant degradation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116730538A (en) * | 2023-06-25 | 2023-09-12 | 广东威特雅环境科技有限公司 | Method and system for degrading pollutants in phenolic resin synthetic wastewater |
| CN116730538B (en) * | 2023-06-25 | 2024-05-24 | 广东威特雅环境科技有限公司 | Method and system for degrading pollutants in phenolic resin synthetic wastewater |
| CN116891320A (en) * | 2023-07-20 | 2023-10-17 | 广东威特雅环境科技有限公司 | Shale gas exploitation fracturing flow-back wastewater pollutant degradation method |
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