CN111634994B - Reactor, system and method for improving biodegradability of refractory organic wastewater - Google Patents
Reactor, system and method for improving biodegradability of refractory organic wastewater Download PDFInfo
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- CN111634994B CN111634994B CN202010533492.6A CN202010533492A CN111634994B CN 111634994 B CN111634994 B CN 111634994B CN 202010533492 A CN202010533492 A CN 202010533492A CN 111634994 B CN111634994 B CN 111634994B
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
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- Y02W10/00—Technologies for wastewater treatment
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Abstract
The invention discloses a reactor, a system and a method for improving biodegradability of refractory organic wastewater, wherein the reactor comprises a reactor main body, a partition plate, a first electrode plate component, a second electrode plate component and an aeration device, a reaction zone is formed in the reactor main body, the partition plate is arranged in the reaction zone to divide the reaction zone into an aerobic zone and an anoxic zone, a first communicating hole and a second communicating hole which are arranged at intervals are formed between the aerobic zone and the anoxic zone, so as to form water circulation between the aerobic zone and the anoxic zone, the first electrode plate component is arranged in the aerobic zone and comprises a first anode plate and a first cathode plate, and are all activated carbon fiber electrode plates, the second electrode plate component is arranged in the anoxic zone and comprises a second anode plate and a second cathode plate, and are all activated carbon fiber electrode plates, the aeration device comprises an aeration head, and the aeration head is arranged in the reaction area and is positioned below the first electrode plate component. The invention aims to improve the biodegradability of the treated organic wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a reactor, a system and a method for improving biodegradability of refractory organic wastewater.
Background
With the development of modern industries in China, such as the fine chemical industry, the paper making industry, the pharmaceutical industry and the petrochemical industry, the discharge amount of refractory organic sewage is increasing day by day, and the sewage has high pollutant concentration, stable structure, large chroma, strong toxicity and poor biodegradability (BOD/CODcr), thereby bringing great difficulty to biological treatment. At present, before traditional biological treatment, the wastewater needs to be pretreated by a physical and chemical method. The physical and chemical pretreatment comprises filtration, advanced oxidation technology, ozone oxidation, extraction method, coagulating sedimentation and the like, however, the capacity of removing pollutants is relatively weak, and the method has high investment cost and operation cost especially for wastewater containing refractory organic pollutants and cannot be applied to large projects.
Disclosure of Invention
The invention mainly aims to provide a reactor, a system and a method for improving biodegradability of refractory organic wastewater, aiming at treating the refractory organic wastewater to improve biodegradability of the treated wastewater and reduce investment and operation cost.
In order to achieve the above object, the present invention provides a reactor for improving the biodegradability of refractory organic wastewater, comprising:
the reactor comprises a reactor main body, wherein a reaction area is formed in the reactor main body and is provided with a water inlet and a water outlet which are communicated with the outside;
the separation plate is arranged in the reaction zone and divides the reaction zone into an aerobic zone and an anoxic zone, and first communication holes and second communication holes which are arranged at intervals are formed between the aerobic zone and the anoxic zone so as to form water circulation between the aerobic zone and the anoxic zone;
the first electrode plate assembly is arranged in the aerobic zone and comprises a first anode plate and a first cathode plate, and the first anode plate and the first cathode plate are both activated carbon fiber electrode plates;
the second electrode plate assembly is arranged in the anoxic zone and comprises a second anode plate and a second cathode plate, and the second anode plate and the second cathode plate are both activated carbon fiber electrode plates; and the number of the first and second groups,
the aeration device comprises an aeration head, wherein the aeration head is arranged in the aerobic zone and is positioned below the first electrode plate component.
Optionally, a plurality of first electrode plate assemblies are arranged, the plurality of first electrode plate assemblies are arranged at intervals, and the first anode plates and the first cathode plates are arranged in a staggered manner; and/or the presence of a gas in the gas,
the second electrode plate component is provided with a plurality of second electrode plate components which are arranged at intervals, and the second anode plates and the second cathode plates are arranged in a staggered mode.
Optionally, the reactor further comprises a first hydraulic propeller, the first hydraulic propeller is arranged in the aerobic zone and close to the first communication hole, so as to drive water in the aerobic zone to flow to the anoxic zone; and/or the presence of a gas in the gas,
the reactor also comprises a second hydraulic propeller, and the second hydraulic propeller is arranged in the anoxic zone and close to the second communicating hole so as to drive water in the anoxic zone to flow to the aerobic zone.
Optionally, the aerobic zone is located above the anoxic zone; and/or the presence of a gas in the gas,
the volume ratio of the aerobic zone to the anoxic zone is 1.5-3: 1.
Optionally, the aeration head is provided in plurality.
In addition, the invention also provides a system for improving the biodegradability of the refractory organic wastewater, which comprises the following components:
a reactor for improving the biodegradability of refractory organic wastewater as described above; and the number of the first and second groups,
the acid-base adjusting tank is provided with an introducing port and a leading-out port, the introducing port is used for being connected with the organic wastewater, the leading-out port is communicated with a water inlet of the reactor, and an acid-base regulator feeding device is arranged above the acid-base adjusting tank.
In order to achieve the above object, the present invention further provides a method for improving the biodegradability of refractory organic wastewater, comprising the following steps:
providing a system for enhancing biodegradability of refractory organic wastewater as described above;
so that the organic wastewater forms water circulation between the aerobic zone and the anoxic zone;
and continuously introducing compressed air into the aerobic zone, and simultaneously carrying out electrolysis and electrocatalysis cooperative treatment on the organic wastewater in the aerobic zone and the organic wastewater in the anoxic zone to obtain treated water.
Optionally, in the step of continuously introducing compressed air into the aerobic zone, and simultaneously performing electrolysis and electrocatalysis synergistic treatment on the organic wastewater in the aerobic zone and the organic wastewater in the anoxic zone to obtain treated water, the ratio of the flow rate of the compressed air introduced into the aerobic zone to the flow rate of the organic wastewater is 1-4: 1.
Optionally, in the step of continuously introducing compressed air into the aerobic zone and simultaneously performing electrolysis and electrocatalysis synergistic treatment on the organic wastewater in the aerobic zone and the organic wastewater in the anoxic zone to obtain treated water, the hydraulic retention time of the organic wastewater in the reaction zone is 60-110 min; and/or the presence of a gas in the gas,
during electrolysis, the parameters of the first electrode plate component are that the current density is 12-28 mA/cm2The distance between the polar plates between the first anode plate and the first cathode plate is 2-4 cm; and/or the presence of a gas in the gas,
during electrolysis, the parameters of the second electrode plate component are that the current density is 12-28 mA/cm2And the distance between the polar plates between the second anode plate and the second cathode plate is 2-4 cm.
Optionally, before the step of circulating the organic wastewater to form a water flow between the aerobic zone and the anoxic zone, the method further comprises the following steps: and (3) adding an acid-base regulator into the acid-base regulating tank, and regulating the pH of the organic wastewater to 4-6.
In the technical scheme of the invention, the reactor for improving the biodegradability of the refractory organic wastewater comprises a reactor main body, an isolation plate, a first electrode plate assembly, a second electrode plate assembly and an aeration device, the wastewater is subjected to electrolysis and electrocatalysis synergistic action through an activated carbon fiber electrode in an aerobic zone, and dissolved oxygen in water generates strong-oxidizing intermediate products such as [ O ] capable of oxidizing refractory organic components in the wastewater in a first cathode plate2 2-]、[H2O2]、[·OH]When the wastewater is electrolyzed and electrocatalytic in the anoxic zone by the activated carbon fiber electrode, the hydronium ion in the wastewater generates nascent state [ H ] with reducing ability in the second negative plate]Simultaneously, under the circulation action of water flow between the aerobic zone and the anoxic zone, the wastewater is circulated in the reaction zone to carry out aerobic electrolysis-anoxic electrolysis coupling reaction, thereby fully oxidizing the refractory organic matter componentsReducing and improving the biodegradability of the refractory organic components. The technical scheme provided by the invention is simple and feasible, and the investment and operation cost are lower.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of an embodiment of a reactor for improving biodegradability of refractory organic wastewater according to the present invention;
FIG. 2 is a schematic view of an embodiment of a system for enhancing biodegradability of refractory organic wastewater according to the present invention;
FIG. 3 is a schematic flow chart of an embodiment of the method for improving biodegradability of refractory organic wastewater provided by the present invention.
The reference numbers indicate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The persistent organic sewage has high pollutant concentration, stable structure, great chroma and high toxicity, and its biochemical oxygen demand/chemical oxygen demand (BOD/CODcr) is usually far less than 0.3, so that the subsequent biological treatment of the sewage is difficult. Therefore, prior to conventional biological treatment, wastewater pretreatment is required. At present, physicochemical pretreatment methods such as filtration, advanced oxidation technology, ozone oxidation, extraction method, coagulating sedimentation and the like are commonly used, however, the capacity of removing pollutants is relatively weak, and particularly, the method has high investment cost and operation cost for wastewater containing refractory organic pollutants and cannot be applied to large projects.
In view of the above, the present invention provides a system 100 for improving the biodegradability of non-degradable organic wastewater, the system 100 includes a reactor 10 for improving the biodegradability of non-degradable organic wastewater and an acid-base regulation tank 20, the main invention of the present invention lies in the improvement of the reactor 10 for improving the biodegradability of non-degradable organic wastewater, and the reactor 10 for improving the biodegradability of non-degradable organic wastewater is mainly described below with reference to the specific drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of an embodiment of a reactor 10 for improving biodegradability of refractory organic wastewater.
In this embodiment, the reactor 10 for improving biodegradability of refractory organic wastewater comprises a reactor body 1, a separation plate 2, a first electrode plate assembly 3, a second electrode plate assembly 4 and an aeration device. Wherein, a reaction zone is formed in the reactor main body 1, and the reaction zone is provided with a water inlet 7 and a water outlet 8 which are communicated with the outside; the partition board 2 is arranged in the reaction zone to partition the reaction zone into an aerobic zone 201 and an anoxic zone 202, and first communication holes 21 and second communication holes 22 which are arranged at intervals are formed between the aerobic zone 201 and the anoxic zone 202 so as to form water flow circulation between the aerobic zone 201 and the anoxic zone 202; the first electrode plate assembly 3 is arranged in the aerobic zone 201, the first electrode plate assembly 3 comprises a first anode plate 31 and a first cathode plate 32, and the first anode plate 31 and the first cathode plate 32 are both activated carbon fiber electrode plates; the second electrode plate assembly 4 is arranged in the anoxic zone 202, the second electrode plate assembly 4 comprises a second anode plate 41 and a second cathode plate 42, and the second anode plate 41 and the second cathode plate 42 are both activated carbon fiber electrode plates; the aeration device comprises an aeration head 51, and the aeration head 51 is arranged in the aerobic zone and is positioned below the first electrode plate component 3.
In aerobic environment, organic wastewater is electrolyzed, and when the selected electrode plate is an activated carbon fiber electrode plate, the activated carbon fiber electrode plate has the characteristics of porosity and high specific surface area, pollutants can be enriched on the surface of the electrode after being adsorbed, then electrocatalysis treatment is carried out, dissolved oxygen in the organic wastewater is reduced at a cathode plate, and a strong oxidizing intermediate product such as [ O ] which can oxidize refractory organic matter components in the wastewater is generated under the electrocatalysis action of activated carbon fibers2 2-]、[H2O2]、[·OH]And the like, so that the macromolecular organic matters which are difficult to degrade are subjected to ring opening and fracture, and become easily biodegradable; when the wastewater is in an anoxic environment, the wastewater is electrolyzed, and hydronium ions in the wastewater are reduced into hydronium ions at the cathode plateHydrogen, the hydrogen generates nascent state [ H ] with reducing ability under the catalytic action of activated carbon fiber]New ecology of [ H ]]The organic compound decoloring agent has high activity, can reduce partial oxidizing groups in the components of the organic matters difficult to degrade so as to improve the biodegradability of the organic matters, and can also destroy the color development structures of some color development substances in industrial wastewater so as to break azo groups, decompose macromolecules into micromolecules and reduce nitro compounds into amino compounds, thereby achieving the aim of decoloring. In the technical scheme of the invention, the reaction zone is divided into an aerobic zone 201 and an anoxic zone 202 which can carry out water flow circulation mutually by arranging the isolation plate 2; an aeration device is arranged in the aerobic zone 201 to create an aerobic environment, so that the wastewater is subjected to aerobic electrolysis and electrocatalysis in the aerobic zone 201, and the biodegradability of the wastewater is improved by using an oxidation reaction; by carrying out anoxic electrolysis and electrocatalysis in the anoxic zone 202, the biodegradability of the wastewater is improved by utilizing a reduction reaction; and further, the circulation of the wastewater between the aerobic zone 201 and the anoxic zone 202 is utilized, so that the wastewater circularly carries out aerobic electrolysis-anoxic electrolysis coupling reaction in the reaction zone, the refractory organic components are fully oxidized and reduced, and the biodegradability of the refractory organic components is improved. Meanwhile, the airflow generated during aeration also plays a role of stirring, so that the mass transfer in the reactor 10 is accelerated, the concentration polarization in the electrolytic reaction is eliminated, and the reaction speed is accelerated; nascent state produced during anoxic electrolysis and electrocatalysis [ H]But also has the effect of decoloring the wastewater and further improves the treatment effect. The reactor 10 for improving the biodegradability of the refractory organic wastewater has the advantages of simple structure, easy manufacture, low investment and operation cost and suitability for industrial popularization.
The isolation plate 2 can be vertically arranged to separate the reaction zone into an aerobic zone 201 and an anoxic zone 202 which are distributed left and right; it can also be horizontally arranged to divide the reaction zone into an aerobic zone 201 and an anoxic zone 202 which are distributed up and down. In this embodiment, it is preferable that the isolation plate 2 is horizontally disposed to separate the reaction zone into the aerobic zone 201 located at the upper portion and the anoxic zone 202 located at the lower portion, on one hand, the aerobic zone 201 is located above the anoxic zone 202, so as to avoid interference with an anoxic environment in the anoxic zone 202 during aeration, and on the other hand, under the influence of gravity, even if a water flow guiding device is not disposed, wastewater in the aerobic zone 201 can enter the anoxic zone 202, thereby causing water flow circulation.
The volume ratio of the aerobic zone 201 to the anoxic zone 202 is 1.5-3: 1, such as 1.5:1, 1.8:1, 2:1, 2.2:1, 2.5:1, 3:1, etc., so that the content ratio of the generated intermediate products with strong oxidizing property and the nascent state [ H ] can meet the requirement of wastewater treatment, and the oxidizable or reducible components in the wastewater can be fully subjected to oxidation or reduction reaction.
As a preferred embodiment, the aerobic zone 201 can be positioned above the anoxic zone 202, and the volume ratio of the aerobic zone 201 to the anoxic zone 202 is set to be 1.5-3: 1, so that an optimal scheme is obtained, components of the wastewater are fully oxidized and reduced, and the phenomenon that the space of a reaction zone is excessively occupied and waste is caused is avoided.
Besides, in order to realize the water flow circulation between the aerobic zone 201 and the anoxic zone 202, the reaction zone cannot be completely separated by the partition plate 2, and a first communication hole 21 and a second communication hole 22 which are arranged at intervals need to be formed between the aerobic zone 201 and the anoxic zone 202, so that the wastewater in the aerobic zone 201 can enter the anoxic zone 202 through the first communication hole 21, and the wastewater in the anoxic zone 202 can enter the aerobic zone 201 through the second communication hole 22, thereby forming the water flow circulation between the aerobic zone 201 and the anoxic zone 202. In specific implementation, a via hole penetrating through the partition board 2 may be formed in the partition board 2, so as to form a first communication hole 21 or a second communication hole 22 communicating the aerobic zone 201 and the anoxic zone 202; it is also possible to form a gap between the partition plate 2 and the inner wall of the reaction zone, the gap constituting the first communication hole 21 or the second communication hole 22 communicating the aerobic zone 201 and the anoxic zone 202.
The number of the first electrode plate assemblies 3 may be one or more. As a preferred embodiment, in the present embodiment, a plurality of first electrode plate assemblies 3 are provided, the plurality of first electrode plate assemblies 3 are arranged at intervals, and the first anode plates 31 and the first cathode plates 32 are arranged in a staggered manner, so as to improve the electrolysis and electrocatalysis efficiency of the aerobic zone 201. In specific implementation, the first power source 91 is provided, such that the anodes of the first anode plates 31 are electrically connected to the anodes of the first power source 91 through conducting wires, and the cathodes of the first cathode plates 32 are electrically connected to the cathodes of the first power source 91 through conducting wires, so as to supply power to the first electrode plate assembly 3, wherein the first power source 91 is a dc power source.
The number of the second electrode plate assemblies 4 may be one or more. As a preferred embodiment, in the present embodiment, a plurality of second electrode plate assemblies 4 are provided, the plurality of second electrode plate assemblies 4 are arranged at intervals, and the second anode plates 41 and the second cathode plates 42 are arranged in a staggered manner, so as to improve the electrolysis and electrocatalysis efficiency of the anoxic zone 202. In specific implementation, the second power source 92 is provided, such that the anodes of the second anode plates 41 are electrically connected to the anodes of the second power source 92 through conducting wires, and the cathodes of the second cathode plates 42 and the second power source 92 are electrically connected to the conducting wires, so as to supply power to the second electrode plate assembly 4, wherein the second power source 92 is a dc power source.
As a preferred embodiment, it is also possible to provide both a plurality of first electrode plate assemblies 3, a plurality of first electrode plate assemblies 3 being arranged at intervals, and first anode plates 31 and first cathode plates 32 being arranged in a staggered manner, and a plurality of second electrode plate assemblies 4, a plurality of second electrode plate assemblies 4 being arranged at intervals, and second anode plates 41 and second cathode plates 42 being arranged in a staggered manner, thereby simultaneously improving the electrolysis and electrocatalysis efficiency of wastewater in the entire reaction zone.
When the amount of water entering the reactor 10 and the water quality change, the treatment degree of the reactor 10 on the organic wastewater can be adjusted by adjusting the current density input into the first electrode plate assembly 3 and the second electrode plate assembly 4, so that the effluent meets the water quality requirement for subsequent biological treatment.
In order to accelerate the water circulation between the aerobic zone 201 and the anoxic zone 202, a device for pushing water flow, such as a hydraulic propeller, may be further disposed at the first communication hole 21 and the second communication hole 22, and when the reactor 10 for improving biodegradability of refractory organic wastewater according to the present invention is applied to wastewater treatment, the water quality requirement of the effluent may be satisfied by adjusting the rotation speed of the hydraulic propeller according to the variation of the water quantity and the water quality of the reactor 10. In this embodiment, the reactor 10 for improving biodegradability of refractory organic wastewater further includes a first hydraulic thruster 61, and the first hydraulic thruster 61 is disposed in the aerobic zone 201 and is close to the first communication hole 21, so as to drive water in the aerobic zone 201 to flow to the anoxic zone 202, accelerate water circulation, and improve treatment efficiency.
In another embodiment of the present invention, the reactor 10 for improving the biodegradability of the refractory organic wastewater further comprises a second hydraulic thruster 62, and the second hydraulic thruster 62 is disposed in the anoxic zone 202 and adjacent to the second communication hole 22 to drive the water in the anoxic zone 202 to the aerobic zone 201, so as to accelerate the circulation of the water, thereby improving the treatment efficiency.
Preferably, the first hydraulic propeller 61 and the second hydraulic propeller 62 can be arranged at the same time, and the first hydraulic propeller 61 and the second hydraulic propeller 62 work at the same time, so that the water circulation speed is further improved.
The aeration device also comprises a compressed air pipe 52 and a compressed air device (not shown in the figure), one end of the compressed air pipe 52 is connected with the compressed air device, the other end of the compressed air pipe extends into the aerobic zone 201 and is communicated with the aeration head 51, the compressed air device outputs air which enters the aeration head 51 through the compressed air pipe 52 and is then sprayed out, the aeration effect is generated, not only enough oxygen can be provided for the aerobic zone 201, the aerobic atmosphere is created, but also when the air is sprayed out, the waste water is violently stirred by the air flow, and the stirring effect can be realized. When the reactor 10 for improving the biodegradability of the refractory organic wastewater according to the present invention is applied to wastewater treatment, the aeration amount may be adjusted to meet the water quality requirement of the effluent according to the change of the amount of water entering the reactor 10 and the water quality.
One or more aeration heads 51 may be provided. In this embodiment, a plurality of aeration heads 51 are provided to enhance the aeration effect, so that air is simultaneously ejected from the plurality of aeration heads 51 during aeration to rapidly form an aerobic environment in a very short time, thereby accelerating the wastewater treatment speed, and the stirring effect is stronger when the plurality of aeration heads 51 are simultaneously operated.
In addition, in order to achieve the above object, the present invention further provides a system 100 for improving the biodegradability of the refractory organic wastewater, which comprises the reactor 10 for improving the biodegradability of the refractory organic wastewater and the acid-base regulation tank 20. The acid-base adjusting tank 20 is provided with an introducing port 230 and an outlet port, the introducing port 230 is used for introducing organic wastewater, the outlet port is communicated with a water inlet 7 of the reactor 10 for improving biodegradability of the refractory organic wastewater, and an acid-base adjusting agent adding device 210 is arranged above the acid-base adjusting tank 20. Before the organic wastewater is fed into the reactor 10 for improving the biodegradability of the refractory organic wastewater, the pH value of the organic wastewater is adjusted to achieve the most suitable pH value for carrying out an electrolysis reaction and an electrocatalysis reaction, so that the treatment effect is improved. Further, in order to improve the acid-base regulation efficiency, a stirring device 220 may be further disposed in the acid-base regulation tank 20 to accelerate the mixing speed of the wastewater and the acid-base regulator in the acid-base regulation tank 20, so that the acid-base regulator is rapidly dispersed to each location of the acid-base regulation tank 20.
Since the wastewater treatment system adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
Based on the above examples, the present invention provides an example of a method for improving biodegradability of refractory organic wastewater.
In this embodiment, the method for improving biodegradability of refractory organic wastewater comprises the following steps:
step S10, providing the system 100 for improving biodegradability of refractory organic wastewater as described above;
step S20, forming water flow circulation of the organic wastewater between the aerobic zone 201 and the anoxic zone 202;
step S30, continuously introducing compressed air into the aerobic zone 201, and simultaneously performing electrolysis and electrocatalysis co-treatment on the organic wastewater in the aerobic zone 201 and the organic wastewater in the anoxic zone 202 to obtain treated water.
In the technical scheme of the invention, an aerobic environment is created by continuously aerating in the aerobic zone 201, so that the wastewater is subjected to aerobic electrolysis and electrocatalysis in the aerobic zone 201, and the biodegradability of the wastewater is improved by utilizing an oxidation reaction; by carrying out anoxic electrolysis and electrocatalysis in the anoxic zone 202, the biodegradability of the wastewater is improved by utilizing a reduction reaction; meanwhile, the wastewater forms water flow circulation between the aerobic zone 201 and the anoxic zone 202, so that the wastewater circularly carries out aerobic electrolysis-anoxic electrolysis coupling reaction in the reaction zone, the refractory organic components are fully oxidized and reduced, and the biodegradability of the refractory organic components is improved. The invention needs less equipment, and the related system 100 for improving the biodegradability of the refractory organic wastewater has simple structure and flexible operation, and can adjust the current density, the aeration quantity, the installation position, the installation angle, the rotating speed and the like of the hydraulic propeller according to the change of the water inlet quantity and the water quality so as to ensure that the reactor 10 reaches an ideal working state and meet the requirement of the water outlet quality.
The aerobic environment is created by continuous aeration in the aerobic zone 201, so that the wastewater can be subjected to aerobic electrolysis and electrocatalysis in the aerobic zone 201, and the purpose of improving the biodegradability of the wastewater is achieved. As a preferred embodiment of the present invention, in step S30, the ratio of the flow rate of the compressed air to the flow rate of the organic wastewater, i.e., the ratio of air to water, introduced into the aerobic zone 201 is 1-4: 1, because the amount of the compressed air introduced is insufficient, which impairs the electrolysis and electrocatalysis under aerobic conditions; the introduced compressed air quantity is too large, the anoxic state of the anoxic reaction zone can be influenced, so that the electrolysis and electrocatalysis of the anoxic reaction zone are weakened, and in order to further optimize the treatment effect of the method, the preferred gas-water ratio of the embodiment is 1-4: 1.
In order to balance the treatment effect, the speed and the energy consumption, in the embodiment, when the step S30 is performed, the hydraulic retention time of the organic wastewater in the reaction zone is 60-110 min, which is enough to enable most of the refractory organic matter components to be sufficiently and rapidly oxidized and reduced within the time range, so that the biodegradability of the organic wastewater is improved, and thus the energy consumption waste caused by too long time can be avoided.
In step S30, during electrolysis, the parameters of the first electrode plate assembly 3 may be adjusted, specifically, the parameters of the first electrode plate assembly 3 are set to have a current density of 12 to 28mA/cm2The distance between the first anode plate 31 and the first cathode plate 32 is 2-4 cm, so as to improve the electrolytic strength of the aerobic zone 201. In the same way as above, the first and second,the parameters of the second electrode plate assembly 4 can also be adjusted, specifically, the parameters of the second electrode plate assembly 4 are that the current density is 12-28 mA/cm2And the distance between the second anode plate 41 and the second cathode plate 42 is 2-4 cm. Preferably, the parameters of the first electrode plate assembly 3 and the second electrode plate assembly 4 can be adjusted simultaneously, and the electrolytic strength of the aerobic zone 201 and the anoxic zone 202 is considered.
In addition, before performing step S20, the following step S40 is also included.
And S40, adjusting the pH value of the organic wastewater to 4-6.
The pH value of the organic wastewater in the acid-base adjusting tank 20 is 4-6 by adding the acid-base adjusting agent into the acid-base adjusting tank, so that the optimal acid-base environment for electrolysis and electrocatalysis is ensured, and the treatment efficiency is improved.
The technical solutions of the present invention are further described in detail with reference to the following specific examples, which should be understood as merely illustrative and not limitative.
The following example was carried out using the system 100 for improving biodegradability of refractory organic wastewater and printing wastewater shown in FIG. 2. The CODcr concentration of the printing and dyeing wastewater is 1550mg/L, BOD, 190mg/L, and the BOD/CODcr is 0.12, so that the biodegradability is poor, and the chroma is 300 times.
Example 1
An acid-base adjusting agent is put into the acid-base adjusting tank 20 so that the pH of the printing and dyeing wastewater therein is 5. The printing and dyeing wastewater enters a reactor 10, and the volume ratio of an aerobic zone to an anoxic zone of the reactor 10 is 2: 1.
The parameters of the first electrode plate assembly 3 are set as follows: current density 18mA/cm2The distance between the first anode plate 31 and the first cathode plate 32 is 3.5 cm; the parameters of the second electrode plate assembly 4 are set as follows: current density 18mA/cm2The distance between the second anode plate 41 and the second cathode plate 42 is 3.5 cm; setting the hydraulic retention time of the printing and dyeing wastewater in the reaction zone to be 95 min. Starting an aeration device, continuously introducing compressed air into the aerobic zone 201 with the air-water ratio of 2:1, communicating a first power supply 91 to supply power to the first electrode plate assembly 3, and communicating a second power supplyThe second power supply 92 supplies power to the second electrode plate assembly 4, and simultaneously starts the first hydraulic propeller 61 and the second hydraulic propeller 62, so that the printing and dyeing wastewater forms water flow circulation between the aerobic zone 201 and the anoxic zone 202.
Example 2
An acid-base adjusting agent is added to the acid-base adjusting tank 20 so that the pH of the printing and dyeing wastewater therein is 4. The printing and dyeing wastewater enters a reactor 10, and the volume ratio of an aerobic zone to an anoxic zone of the reactor 10 is 1.5: 1.
The parameters of the first electrode plate assembly 3 are set as follows: current density 28mA/cm2The distance between the first anode plate 31 and the first cathode plate 32 is 4 cm; the parameters of the second electrode plate assembly 4 are set as follows: current density 28mA/cm2The distance between the second anode plate 41 and the second cathode plate 42 is 4 cm; setting the hydraulic retention time of the printing and dyeing wastewater in the reaction zone to be 60 min. And (3) starting the aeration device, continuously introducing compressed air into the aerobic zone 201, wherein the air-water ratio is 1:1, communicating the first power supply 91 to supply power for the first electrode plate assembly 3, communicating the second power supply 92 to supply power for the second electrode plate assembly 4, and simultaneously starting the first hydraulic propeller 61 and the second hydraulic propeller 62 to enable the printing and dyeing wastewater to form water flow circulation between the aerobic zone 201 and the anoxic zone 202.
Example 3
An acid-base adjusting agent is put into the acid-base adjusting tank 20 so that the pH of the printing and dyeing wastewater therein is 6. The printing and dyeing wastewater enters a reactor 10, and the volume ratio of an aerobic zone to an anoxic zone of the reactor 10 is 3: 1.
The parameters of the first electrode plate assembly 3 are set as follows: current density 12mA/cm2The distance between the first anode plate 31 and the first cathode plate 32 is 2 cm; the parameters of the second electrode plate assembly 4 are set as follows: current density 12mA/cm2The distance between the second anode plate 41 and the second cathode plate 42 is 2 cm; setting the hydraulic retention time of the printing and dyeing wastewater in the reaction zone to be 110 min. Starting the aeration device, continuously introducing compressed air into the aerobic zone 201 with a gas-water ratio of 4:1, communicating the first power supply 91 to supply power to the first electrode plate assembly 3, communicating the second power supply 92 to supply power to the second electrode plate assembly 4, and simultaneously starting the first hydraulic propeller 61 and the second hydraulic propeller 62 to ensure that the printing and dyeing wastewater is in the aerobic zoneA water flow circulation is formed between the anoxic zone 202 and the 201.
After the treatment, the treated water was sampled at the water outlet 8 of the reactor 10, the CODcr content and BOD of the treated water were measured using a CODcr analyzer and BOD detector, respectively, and the BOD/CODcr value was calculated and the results were recorded in Table 1.
TABLE 1 Water quality comparison before and after treatment
As can be seen from the above table, after the printing and dyeing wastewater is treated by the methods of the embodiments, the CODcr removal rate reaches more than 45%, and the biodegradability BOD/CODcr of the treated water is more than or equal to 0.34, which can meet the requirements of subsequent biochemical treatment. The method can effectively treat the wastewater containing the refractory organic matter components, so that the treated water can meet the requirement of subsequent biochemical treatment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A reactor for improving biodegradability of refractory organic wastewater, comprising:
the reactor comprises a reactor main body, wherein a reaction area is formed in the reactor main body and is provided with a water inlet and a water outlet which are communicated with the outside;
the separation plate is arranged in the reaction zone and divides the reaction zone into an aerobic zone and an anoxic zone, and first communication holes and second communication holes which are arranged at intervals are formed between the aerobic zone and the anoxic zone so as to form water circulation between the aerobic zone and the anoxic zone;
the first electrode plate assembly is arranged in the aerobic zone and comprises a first anode plate and a first cathode plate, and the first anode plate and the first cathode plate are both activated carbon fiber electrode plates;
the second electrode plate assembly is arranged in the anoxic zone and comprises a second anode plate and a second cathode plate, and the second anode plate and the second cathode plate are both activated carbon fiber electrode plates; and the number of the first and second groups,
the aeration device comprises an aeration head, wherein the aeration head is arranged in the aerobic zone and is positioned below the first electrode plate component.
2. The reactor for improving the biodegradability of refractory organic wastewater as recited in claim 1, wherein a plurality of the first electrode plate assemblies are provided, the plurality of the first electrode plate assemblies are arranged at intervals, and the first anode plates and the first cathode plates are arranged in a staggered manner; and/or the presence of a gas in the gas,
the second electrode plate component is provided with a plurality of second electrode plate components which are arranged at intervals, and the second anode plates and the second cathode plates are arranged in a staggered mode.
3. The reactor for improving the biodegradability of refractory organic wastewater of claim 1, wherein the reactor further comprises a first hydraulic thruster disposed in the aerobic zone and adjacent to the first communication hole to drive water in the aerobic zone to the anoxic zone; and/or the presence of a gas in the gas,
the reactor also comprises a second hydraulic propeller, and the second hydraulic propeller is arranged in the anoxic zone and close to the second communicating hole so as to drive water in the anoxic zone to flow to the aerobic zone.
4. The reactor for improving the biodegradability of refractory organic wastewater of claim 1, wherein the aerobic zone is located above the anoxic zone; and/or the presence of a gas in the gas,
the volume ratio of the aerobic zone to the anoxic zone is 1.5-3: 1.
5. The reactor for improving the biodegradability of refractory organic wastewater as recited in claim 1, wherein a plurality of aeration heads are provided.
6. A system for improving biodegradability of refractory organic wastewater, comprising:
the reactor for improving biodegradability of refractory organic wastewater as recited in any one of claims 1 to 5; and the number of the first and second groups,
the acid-base adjusting tank is provided with an introducing port and a leading-out port, the introducing port is used for being connected with the organic wastewater, the leading-out port is communicated with a water inlet of the reactor, and an acid-base regulator feeding device is arranged above the acid-base adjusting tank.
7. A method for improving biodegradability of refractory organic wastewater is characterized by comprising the following steps:
providing a system for enhancing biodegradability of refractory organic wastewater as defined in claim 6;
forming water flow circulation between the aerobic zone and the anoxic zone by the organic wastewater;
and continuously introducing compressed air into the aerobic zone, and simultaneously carrying out electrolysis and electrocatalysis synergistic treatment on the organic wastewater in the aerobic zone and the organic wastewater in the anoxic zone to obtain treated water.
8. The method for improving the biodegradability of refractory organic wastewater as claimed in claim 7, wherein in the step of continuously introducing compressed air into the aerobic zone and simultaneously performing electrolysis and electrocatalysis synergistic treatment on the organic wastewater in the aerobic zone and the organic wastewater in the anoxic zone to obtain treated water, the ratio of the flow rate of the compressed air introduced into the aerobic zone to the flow rate of the organic wastewater is 1-4: 1.
9. The method for improving the biodegradability of the refractory organic wastewater as recited in claim 7, wherein in the step of continuously introducing compressed air into the aerobic zone and simultaneously performing the combined electrolysis and electrocatalysis treatment on the organic wastewater in the aerobic zone and the organic wastewater in the anoxic zone to obtain treated water, the hydraulic retention time of the organic wastewater in the reaction zone is 60-110 min; and/or the presence of a gas in the gas,
during electrolysis, the parameters of the first electrode plate component are that the current density is 12-28 mA/cm2The distance between the polar plates between the first anode plate and the first cathode plate is 2-4 cm; and/or the presence of a gas in the gas,
during electrolysis, the parameters of the second electrode plate component are that the current density is 12-28 mA/cm2And the distance between the polar plates between the second anode plate and the second cathode plate is 2-4 cm.
10. The method for improving the biodegradability of refractory organic wastewater as recited in claim 7, further comprising, prior to the step of circulating the organic wastewater between the aerobic zone and the anoxic zone: and (3) adding an acid-base regulator into the acid-base regulating tank, and regulating the pH of the organic wastewater to 4-6.
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