CN115974271A - Magnetic biological reaction system and water treatment process - Google Patents
Magnetic biological reaction system and water treatment process Download PDFInfo
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- CN115974271A CN115974271A CN202310076053.0A CN202310076053A CN115974271A CN 115974271 A CN115974271 A CN 115974271A CN 202310076053 A CN202310076053 A CN 202310076053A CN 115974271 A CN115974271 A CN 115974271A
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Abstract
The application provides a magnetic biological reaction system and a water treatment process, which relate to the technical field of sewage treatment and comprise a mixing zone, a biological reaction zone, a magnetic clarification zone, a magnetic sludge recovery equipment set and magnetic sludge separation equipment; the method can effectively remove organic pollutants in water, creates a synchronous nitrification and denitrification condition in a low dissolved oxygen and micro-aerobic environment, and realizes a complete denitrification process by using organic matters in raw water in only one biological reaction zone; the magnetic sedimentation tank is introduced to cooperate with chemical dephosphorization and rapid clarification of sludge, and pollutants such as organic matters, total phosphorus, suspended matters and the like in water can be synchronously and effectively removed, so that the quality of the effluent water directly reaches the first grade A standard of pollutant discharge standard of urban sewage treatment plants or the higher IV class water standard of surface level.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a magnetic biological reaction system and a water treatment process.
Background
With the increasingly prominent energy problem, the classical nitrification-denitrification process shows more and more obvious disadvantages: (1) the process flow is long, the occupied area is large, and the capital investment is high; (2) the nitration process needs to be carried out under the aerobic condition, and a large amount of energy consumption is needed; (3) the denitrification process requires a carbon source, while COD in the wastewater Cr Most of the carbon is removed during nitrification aeration, so a carbon source is additionally added during denitrification; (4) in order to maintain higher biological concentration and obtain good denitrification effect, the system must carry out sludge reflux and nitrification reflux at the same time, thus increasing power consumption, operation cost and the like.
Along with the requirement of people on the biological denitrification technology, the development of denitrification process equipment is continuously deepened aiming at the problems of the traditional biological denitrification technology, and on the basis of the traditional activated sludge process, how to research sustainable sewage treatment technology to realize the denitrification purification effect of sewage is a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a magnetic biological reaction system and a water treatment process, which are used for solving the problems of the traditional biological denitrification technology.
In view of the above object, the present application provides, in a first aspect, a magnetic bioreactor system comprising:
the system comprises a mixing zone, a biological reaction zone, a magnetic clarification zone, a magnetic mud recovery equipment set and magnetic mud separation equipment;
the mixing area is communicated with the biological reaction area and is used for conveying the mixed sewage in the mixing area to the biological reaction area;
an aeration device is arranged in the biological reaction zone, so that the mixed sewage is biodegraded in the biological reaction zone;
the water inlet of the magnetic reaction zone is communicated with the water outlet of the biological reaction zone through a pipeline, a magnetic mixing and coagulating stirrer is arranged in the magnetic reaction zone, and a coagulant, a coagulant aid and magnetic powder are added into the magnetic reaction zone, so that sludge floc in sewage is mixed and coagulated with the magnetic powder to reach a suspension state;
the water inlet of the magnetic clarification area is communicated with the water outlet of the magnetic reaction area through a pipeline, a clarifier is arranged in the clarification area, and floc sludge is concentrated through the stirring of the clarifier so as to separate mud from water in the magnetic clarification area;
the inlet of the magnetic sludge recovery equipment set is communicated with the discharge port of the magnetic clarification area through a pipeline, the outlet of the magnetic sludge recovery equipment set is communicated with the inlet of the magnetic reaction area through a backflow pipeline and used for returning a part of magnetic sludge to the magnetic reaction area for recycling,
the return pipeline of the magnetic sludge recovery equipment set is communicated with the inlet of the magnetic sludge separation equipment through a branch pipeline and is used for dissociating and dispersing magnetic powder and floc sludge of the other part of magnetic sludge;
the magnetic mud separation equipment is communicated with the mud concentration reflux area through a pipeline and is used for conveying floc sludge into the mud concentration reflux area;
the sludge concentration reflux area is communicated with the mixing area through a pipeline and is used for pumping and refluxing floc sludge into the mixing area and keeping the biological sludge amount of the biological reaction area.
Further, the aeration device comprises an air source and an aeration belt, wherein the air source is communicated with the aeration belt through a pipeline, and the aeration belt is arranged in the biological reaction zone.
Further, the device also comprises an air plug flow aeration unit which is communicated with the biological reaction zone through a pipeline.
Furthermore, a return gate is arranged on a pipeline for communicating the water inlet of the magnetic reaction zone with the water outlet of the biological reaction zone, and is used for adjusting the sewage backflow flow.
Furthermore, the magnetic reaction zone comprises a plurality of magnetic coagulation chambers which are sequentially communicated through pipelines, and each magnetic coagulation chamber is internally provided with a magnetic mixing and coagulating stirrer.
Furthermore, a pipeline between an inlet of the magnetic mud recovery equipment group and a discharge port of the magnetic clarification area is connected with a pneumatic pinch valve, and the inner wall of the pneumatic pinch valve is provided with a wear-resistant rubber pipe.
Further, the magnetic mud separation equipment is communicated with the magnetic reaction area through a pipeline and is used for conveying magnetic powder into the magnetic reaction area.
Further, the mud concentration backflow area is also communicated with a mud discharge pipeline.
In a second aspect, the present application provides a water treatment process using the above magnetic bioreactor system, including the following steps:
combining the influent water with high pollutant concentration with floc sludge in the sludge concentration reflux area, and conveying the combined influent water with high pollutant concentration to the mixing area through a pipeline for mixing;
mixed sewage enters a biological reaction zone for biodegradation, a micro-aerobic environment is provided through aeration of an aeration device, so that microorganisms are enriched in the biological reaction zone to degrade organic pollutants, in the circulation process of the mixed sewage, according to the attenuation of the amount of water flow degraded organic matters, the concentration difference of dissolved oxygen in one zone can synchronously appear in the change of load, an anoxic zone and an aerobic zone are formed and the conditions for synchronously carrying out nitrification and denitrification and biological phosphorus removal are provided;
the effluent of the biological reaction zone enters a magnetic reaction zone, a magnetic mixing coagulation stirrer is arranged in the magnetic reaction zone, and after sewage enters the magnetic reaction zone, a coagulant aid and magnetic powder are added to mix and coagulate sewage sludge floc and the magnetic powder, so that the sewage sludge floc and the magnetic powder are in a suspension state under the stirring action;
the effluent of the magnetic reaction zone enters a magnetic clarification zone, floc sludge is concentrated through a magnetic clarifier, so that sludge floc is combined, tightly and quickly precipitated to achieve a sludge-water separation effect, purified water is discharged outside through the upper part of the magnetic clarification zone, and the enriched sludge is discharged to a magnetic sludge recovery equipment set through a pipeline at the bottom of the magnetic clarification zone;
conveying a part of sludge back to the magnetic reaction zone through a magnetic sludge recovery equipment pump for recycling so as to increase the particle concentration in the magnetic reaction zone, increase the collision frequency between sludge floc particles and the medicament and strengthen the density of the sludge floc generated by magnetic reaction; conveying the other part of sludge into magnetic sludge separation equipment, dissociating and dispersing the magnetic sludge, and recovering magnetic powder to a magnetic reaction area to maintain the concentration of the magnetic powder in the system; conveying the sludge separated by the magnetic sludge separation equipment to a sludge concentration reflux area;
and one part of sludge in the sludge concentration reflux zone reflows to the biological reaction zone so as to keep the biological sludge amount in the biological reaction zone, and the other part of sludge in the sludge concentration reflux zone is discharged out of the system.
Furthermore, a coagulant of 10ppm and a coagulant aid of 0.5ppm are added into the magnetic reaction zone.
Adopt above-mentioned technical scheme, the magnetism biological reaction system and water treatment process that this application provided, compare in prior art, the technological effect that has:
according to the magnetic biological reaction system, after the inflow water with high pollutant concentration is combined with the floc sludge in the sludge concentration and backflow area, the inflow water with high pollutant concentration is conveyed to the mixing area through the pipeline to be mixed, so that the pollutant load is reduced, and the load resistance of the system is improved; mixed sewage enters a biological reaction zone for biodegradation, a micro-aerobic environment is provided through aeration of an aeration device, so that microorganisms are enriched in the biological reaction zone to degrade organic pollutants, in the circulation process of the mixed sewage, according to the attenuation of the amount of water flow degraded organic matters, the concentration difference of dissolved oxygen in one zone can synchronously appear in the change of load, an anoxic zone and an aerobic zone are formed and the conditions for synchronously carrying out nitrification and denitrification and biological phosphorus removal are provided; the effluent of the biological reaction zone enters a magnetic reaction zone, a magnetic mixing coagulation stirrer is arranged in the magnetic reaction zone, and after sewage enters the magnetic reaction zone, a coagulant aid and magnetic powder are added to mix and coagulate sewage sludge floc and the magnetic powder, so that the sewage sludge floc and the magnetic powder are in a suspension state under the stirring action;
the effluent of the magnetic reaction zone enters a magnetic clarification zone, floc sludge is concentrated through a magnetic clarifier, so that sludge floc is combined, tightly and quickly precipitated to achieve a sludge-water separation effect, purified water is discharged outside through the upper part of the magnetic clarification zone, and the enriched sludge is discharged to a magnetic sludge recovery equipment set through a pipeline at the bottom of the magnetic clarification zone; conveying a part of sludge back to the magnetic reaction zone through a magnetic sludge recovery equipment pump for recycling so as to increase the particle concentration in the magnetic reaction zone, increase the collision frequency between sludge floc particles and the medicament and strengthen the density of the sludge floc generated by magnetic reaction; conveying the other part of sludge into magnetic sludge separation equipment, dissociating and dispersing the magnetic sludge, and recovering magnetic powder to a magnetic reaction area to keep the concentration of the magnetic powder in the system; conveying the sludge separated by the magnetic sludge separation equipment to a sludge concentration reflux area; and one part of sludge in the sludge concentration reflux zone reflows to the biological reaction zone so as to keep the biological sludge amount in the biological reaction zone, and the other part of sludge in the sludge concentration reflux zone is discharged out of the system.
The process flow adopted by the system reduces the occupied area and lowers the investment cost; the method has the advantages that while organic pollutants in water are effectively removed, a synchronous nitrification and denitrification nitrogen removal condition is created under the low dissolved oxygen and micro-aerobic environment, a complete nitrogen removal process is realized only by using organic matters in raw water in one biological reaction area, a carbon source in the raw water is fully utilized, and the operation energy consumption is reduced; the magnetic sedimentation tank is introduced to cooperate with chemical dephosphorization and rapid clarification of sludge, and pollutants such as organic matters, total phosphorus, suspended matters and the like in water can be synchronously and effectively removed, so that the quality of the effluent water directly reaches the first grade A standard of pollutant discharge standard of urban sewage treatment plants or the higher IV class water standard of surface level.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a magnetic bioreactor system provided in an embodiment of the present application;
FIG. 2 is a top view of a magnetic bioreactor system provided in an embodiment of the present application.
Icon: 1-a mixing zone; 2-a biological reaction zone; 3-air thrust zone; 4-a magnetic reaction zone; 5-magnetic clearing zone; 6-magnetic mud recovery equipment group; 7-a sludge concentration reflux zone; 8-a return gate; 9-water outlet gate; 10-aeration zone; 11-air plug flow aeration machine set; 12-a magnetic mixing coacervation stirrer; 13-magnetic mud recovery plant pump; 14-a clarifier; 15-sludge reflux pump; 16-pneumatic pinch valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
The magnetic biological reaction system provided in the embodiment is a magnetic biological reaction system which is completely different from various microorganism domestication modes and living environments of traditional activated sludge processes and is established on the basis of a traditional activated sludge method, effectively removes organic pollutants in water, creates a synchronous nitrification and denitrification nitrogen removal condition in a low dissolved oxygen environment, realizes a complete nitrogen removal process in a biological reaction zone, introduces a magnetic clarification zone at the rear end to be matched with chemical phosphorus removal and rapid sludge clarification, effectively removes pollutants such as organic matters, total phosphorus, total nitrogen, suspended matters and the like in water, and ensures that the effluent quality directly reaches the first-level A standard of pollutant discharge standards of urban sewage treatment plants or the higher surface level IV water standards.
Specifically, as shown in fig. 1 and fig. 2, the present application provides a magnetic bioreactor system, including: the system comprises a mixing zone 1, a biological reaction zone 2, a magnetic reaction zone 4, a magnetic clarification zone 5, a magnetic sludge recovery equipment set 6 and magnetic sludge separation equipment;
the mixing area 1 is communicated with the biological reaction area 2 and is used for conveying the mixed sewage in the mixing area 1 to the biological reaction area 2;
an aeration device is arranged in the biological reaction zone 2, so that the mixed sewage is biodegraded in the biological reaction zone 2; the aeration device provides a micro-aerobic environment, DO in the biological reaction zone 2 is controlled to be 0.5mg/L, more and large-quantity microbial communities are enriched in the biological reaction zone 2, various organic pollutants are effectively degraded, and in the circulating process of the biological reaction zone, the concentration difference of dissolved oxygen in one zone can synchronously occur according to the attenuation of the quantity of water flow degraded organic matters and the change of load, so that small zones alternately appearing in an anoxic zone and an aerobic zone appear in the same reaction zone, and the optimal condition for synchronously carrying out nitrification and denitrification and biological phosphorus removal is provided.
The water inlet of the magnetic reaction zone 4 is communicated with the water outlet of the biological reaction zone 2 through a pipeline which is communicated with a water outlet gate 9; a magnetic mixing coagulation stirrer 12 is arranged in a magnetic reaction zone 4, coagulant aid and magnetic powder are added into the magnetic reaction zone 4, wherein the power of the magnetic mixing coagulation stirrer 12 is 0.25kw, after sewage enters the system, coagulant aid 10ppm and coagulant aid 0.5ppm are added, so that sewage sludge floc and magnetic powder circulating in the system are mixed and coagulated and uniformly mixed, and finally, a bottom-separated suspension state is achieved under the stirring effect, so that the uniformity of sewage mixing flocculation is ensured, and the dense floc cannot be settled and accumulated.
The water inlet of the magnetic clarification area 5 is communicated with the water outlet of the magnetic reaction area 4 through a pipeline, a clarifier 14 is arranged in the magnetic clarification area 5, floc sludge is further concentrated through stirring of the clarifier 14, so that the sludge floc in the magnetic clarification area 5 is tightly combined, the sludge is rapidly precipitated, the effect of separating mud from water is achieved, and finally, purified water is discharged.
The inlet of the magnetic sludge recovery equipment group 6 is communicated with the discharge port of the magnetic clarification zone 5 through a pipeline, the outlet of the magnetic sludge recovery equipment group 6 is communicated with the inlet of the magnetic reaction zone 4 through a backflow pipeline and a magnetic sludge recovery equipment pump 13, and the magnetic sludge recovery equipment group is used for returning a part of magnetic sludge to the magnetic reaction zone 4 for recycling so as to increase the particle concentration in the magnetic reaction zone 4, increase the collision frequency between sludge floc particles and a medicament, strengthen the density of the magnetic reaction sludge floc and facilitate the reaction;
a return pipeline of the magnetic sludge recovery equipment group 6 is communicated with an inlet of the magnetic sludge separation equipment through a branch pipeline and is used for dissociating and dispersing magnetic powder and floc sludge of the other part of magnetic sludge;
the magnetic mud separation equipment is communicated with the mud concentration reflux area 7 through a pipeline and is used for conveying floc sludge into the mud concentration reflux area 7; the magnetic mud separation equipment is communicated with the magnetic reaction zone 4 through a return pipeline and is used for conveying magnetic powder into the magnetic reaction zone 4 so as to keep the concentration of the magnetic powder in the system and achieve the purpose of resource recycling;
the mud concentration reflux area 7 is communicated with the mixing area 1 through a pipeline and a mud reflux pump 15 and is used for pumping and refluxing floc sludge to the mixing area 1 and keeping the biological sludge amount of the biological reaction area 2, and the mud concentration reflux area 7 is also communicated with a mud discharge pipeline and is used for discharging the rest sludge.
In a preferred embodiment, the aeration means comprises an air source and an aeration zone 10, the air source and aeration zone 10 being in communication by a conduit, aeration zone 10 being disposed within biological reaction zone 2.
In a preferred embodiment, the device further comprises an air thrust aeration unit 11 which is positioned in the air thrust zone 3; the air plug flow aeration group 11 is communicated with the biological reaction zone 2 through a pipeline. The air plug flow aeration unit 11 takes air as a power source to lift and circulate sewage in a limited tank body in a large proportion, wherein the circulation proportion is 200%. Not only the water is diluted in the mixing area 1 to reduce the load, but also the pollutants are effectively degraded in the internal circulation process of the sewage. Meanwhile, under the condition of not adding a carbon source, the nitrogen element in the water is removed by denitrification by using the organic matters in the sewage.
In a preferred embodiment, the pipeline connecting the water inlet of the magnetic reaction zone 4 and the water outlet of the biological reaction zone 2 is provided with a return gate 8 for adjusting the sewage return flow.
In a preferred embodiment, the magnetic reaction zone 4 comprises a plurality of magnetic coagulation chambers sequentially communicated by a pipeline, and a magnetic mixing and coagulating stirrer 12 is respectively arranged in each magnetic coagulation chamber.
In a preferred embodiment, a pipeline between the inlet of the magnetic mud recovery equipment group 6 and the discharge port of the magnetic clarification area 5 is connected with a pneumatic pinch valve 16, and the inner wall of the pneumatic pinch valve 16 is provided with a wear-resistant rubber pipe for the function of an equipment maintenance valve, so that the pneumatic pinch valve has long service life and is not easy to leak water.
In the magnetic biological reaction system provided in this embodiment, the mixing zone 1 is set to 0.1mx 0.8m; the biological reaction zone 2 is provided with 1.4m0.6m, and the retention time is 1h; mud concentration reflux zone 70.5m 3 . The overall footprint is about 1.2m x 3m, 3.6m 2 The treatment amount is 100m 3 D is calculated as the ratio of the total weight of the composition. The system inlet water quality is raw water of a certain project sewage treatment plant. The main water quality parameters are as shown in the table:
| quality of inlet water | Parameter(s) | Unit |
| COD | 150 | mg/L |
| NH3-N | 25 | mg/L |
| TN | 34 | mg/L |
| TP | 3 | mg/L |
| SS | 50 | mg/L |
| pH | 6-9 |
The water treatment process performed by the magnetic biological reaction system in the embodiment comprises the following steps:
the influent water with high pollutant concentration is combined with the floc sludge in the sludge concentration reflux area 7 and then is conveyed to the mixing area 1 through a pipeline for mixing; the pollutant load is reduced, and the load resistance of the system is improved;
mixed sewage enters a biological reaction zone 2 for biodegradation, a micro-aerobic environment is provided by aeration of an aeration device, DO in the biological reaction zone 2 is controlled to be 0.5mg/L, so that microorganisms are enriched in the biological reaction zone 2 to degrade organic pollutants, and in the circulation process of the mixed sewage, according to the attenuation of the quantity of water flow degraded organic matters, the concentration difference of dissolved oxygen in one zone can synchronously occur in the change of load, so that an anoxic zone and an aerobic zone which alternately appear are formed, and the condition for synchronously carrying out nitrification and denitrification and biological phosphorus removal is provided;
in the process, the air plug-flow aeration unit 11 assists in carrying out a large-proportion lifting circulation of sewage in a limited tank body by taking air as a power source, wherein the circulation proportion is 200%. Not only the water is diluted in the mixing area 1 to reduce the load, but also the pollutants are effectively degraded in the internal circulation process of the sewage. Meanwhile, under the condition of not adding a carbon source, the nitrogen element in the water is removed by denitrification by using the organic matters in the sewage;
the effluent of the biological reaction zone 2 enters a magnetic reaction zone 4, a magnetic mixing coagulation stirrer 12 with the power of 0.25kw is arranged in the magnetic reaction zone 4, and after the sewage enters, a coagulant of 10ppm and a coagulant aid of 0.5ppm are added to mix and coagulate sewage sludge floc and magnetic powder, and the sewage sludge floc and the magnetic powder reach a suspension state under the stirring action; the uniformity of sewage mixing flocculation is ensured, and dense floc is not settled and stacked;
the effluent of the magnetic reaction zone 4 enters a magnetic clarification zone 5, sludge flocs are concentrated through a magnetic clarifier 14, so that the sludge flocs are combined tightly and quickly precipitated to achieve the effect of separating mud from water, and the load in the magnetic clarification zone 5 is 16m 3 /m 2 Discharging purified water above the magnetic clarification zone 5, and discharging the enriched sludge to a magnetic sludge recovery equipment set 6 through a pipeline at the bottom of the magnetic clarification zone 5;
a part of sludge is conveyed back to the magnetic reaction zone 4 through a magnetic sludge recovery equipment pump 13 for recycling so as to increase the particle concentration in the magnetic reaction zone 4, increase the collision frequency between sludge floc particles and medicaments and strengthen the density of the sludge floc in the magnetic reaction; the other part of sludge is conveyed into magnetic sludge separation equipment, the magnetic sludge is dissociated and dispersed, and magnetic powder is recovered to a magnetic reaction zone 4 so as to keep the concentration of the magnetic powder in the system; the sludge separated by the magnetic sludge separation equipment is conveyed to a sludge concentration reflux area 7;
one part of the sludge in the sludge concentration return zone 7 returns to the biological reaction zone 2 so as to keep the amount of the biological sludge in the biological reaction zone 2, and the other part of the sludge in the sludge concentration return zone 7 is discharged out of the system.
The final effluent quality is as follows:
| quality of inlet water | Parameter(s) | Unit of |
| COD | 50 | mg/L |
| NH3-N | 2 | mg/ |
| TN | ||
| 15 | mg/L | |
| TP | 0.5 | mg/L |
| SS | 10 | mg/L |
| pH | 6-9 |
Finally, the treated effluent can directly reach the first class A standard of pollutant discharge standard of urban sewage treatment plants.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A magnetic bioreaction system, comprising: the system comprises a mixing zone, a biological reaction zone, a magnetic clarification zone, a magnetic mud recovery equipment set and magnetic mud separation equipment;
the mixing area is communicated with the biological reaction area and is used for conveying the mixed sewage in the mixing area to the biological reaction area;
an aeration device is arranged in the biological reaction zone, so that the mixed sewage is biodegraded in the biological reaction zone;
the water inlet of the magnetic reaction zone is communicated with the water outlet of the biological reaction zone through a pipeline, a magnetic mixing and coagulating stirrer is arranged in the magnetic reaction zone, and a coagulant, a coagulant aid and magnetic powder are added into the magnetic reaction zone, so that sludge floc in sewage is mixed and coagulated with the magnetic powder to reach a suspension state;
the water inlet of the magnetic clarification area is communicated with the water outlet of the magnetic reaction area through a pipeline, a clarifier is arranged in the clarification area, and floc sludge is concentrated through the stirring of the clarifier so as to separate mud from water in the magnetic clarification area;
the inlet of the magnetic sludge recovery equipment set is communicated with the discharge port of the magnetic clarification area through a pipeline, the outlet of the magnetic sludge recovery equipment set is communicated with the inlet of the magnetic reaction area through a backflow pipeline and used for returning a part of magnetic sludge to the magnetic reaction area for recycling,
the return pipeline of the magnetic sludge recovery equipment set is communicated with the inlet of the magnetic sludge separation equipment through a branch pipeline and is used for dissociating and dispersing magnetic powder and floc sludge of the other part of magnetic sludge;
the magnetic mud separation equipment is communicated with the mud concentration reflux area through a pipeline and is used for conveying floc sludge into the mud concentration reflux area;
the sludge concentration reflux area is communicated with the mixing area through a pipeline and is used for pumping and refluxing floc sludge into the mixing area and keeping the biological sludge amount of the biological reaction area.
2. The magnetobiological reaction system of claim 1, wherein the aeration device comprises an air source and an aeration zone, the air source and the aeration zone being in communication via a conduit, the aeration zone being disposed within the biological reaction zone.
3. The magnetobiological reaction system of claim 1, further comprising an air-pushed aeration set in communication with the biological reaction zone via a conduit.
4. The magnetic biological reaction system according to claim 1, wherein a return gate is arranged on a pipeline communicating the water inlet of the magnetic reaction zone with the water outlet of the biological reaction zone, and is used for adjusting the return flow of sewage.
5. The magnetobioreaction system according to claim 1, wherein said magnetic reaction zone comprises a plurality of magnetic coagulation chambers sequentially connected through a pipeline, and a magnetic mixing and coagulating stirrer is disposed in each magnetic coagulation chamber.
6. The magnetobiological reaction system of claim 1, wherein a pneumatic pinch valve is connected to a pipeline between an inlet of the magnetic sludge recovery equipment set and a discharge port of the magnetic clarification zone, and an abrasion-resistant rubber pipe is arranged on the inner wall of the pneumatic pinch valve.
7. The magnetobiological reaction system of claim 1, wherein the magnetic sludge separation device is in communication with the magnetic reaction zone via a conduit for transporting magnetic particles into the magnetic reaction zone.
8. The magnetobiological reaction system of claim 1, wherein the sludge concentrating and refluxing region is further communicated with a sludge discharge pipeline.
9. A water treatment process, characterized in that the application of the magnetic biological reaction system of any one of claims 1 to 8 comprises the following steps:
combining the influent water with high pollutant concentration with floc sludge in the sludge concentration reflux area, and conveying the combined influent water with high pollutant concentration to the mixing area through a pipeline for mixing;
mixed sewage enters a biological reaction zone for biodegradation, a micro-aerobic environment is provided through aeration of an aeration device, so that microorganisms are enriched in the biological reaction zone to degrade organic pollutants, in the circulation process of the mixed sewage, according to the attenuation of the amount of water flow degraded organic matters, the concentration difference of dissolved oxygen in one zone can synchronously appear in the change of load, an anoxic zone and an aerobic zone are formed and the conditions for synchronously carrying out nitrification and denitrification and biological phosphorus removal are provided;
the effluent of the biological reaction zone enters a magnetic reaction zone, a magnetic mixing coagulation stirrer is arranged in the magnetic reaction zone, and after sewage enters the magnetic reaction zone, a coagulant aid and magnetic powder are added to mix and coagulate sewage sludge floc and the magnetic powder, so that the sewage sludge floc and the magnetic powder are in a suspension state under the stirring action;
the effluent of the magnetic reaction zone enters a magnetic clarification zone, sludge flocs are concentrated through a magnetic clarifier to be combined to be tightly and quickly precipitated so as to achieve the effect of separating mud from water, the purified water is discharged outside through the upper part of the magnetic clarification zone, and the enriched sludge is discharged to a magnetic sludge recovery device group through a pipeline at the bottom of the magnetic clarification zone;
conveying a part of sludge back to the magnetic reaction zone through a magnetic sludge recovery equipment pump for recycling so as to increase the particle concentration in the magnetic reaction zone, increase the collision frequency between sludge floc particles and the medicament and strengthen the density of the sludge floc generated by magnetic reaction; conveying the other part of sludge into magnetic sludge separation equipment, dissociating and dispersing the magnetic sludge, and recovering magnetic powder to a magnetic reaction area to keep the concentration of the magnetic powder in the system; conveying the sludge separated by the magnetic sludge separation equipment to a sludge concentration reflux area;
and one part of sludge in the sludge concentration reflux zone reflows to the biological reaction zone so as to keep the biological sludge amount in the biological reaction zone, and the other part of sludge in the sludge concentration reflux zone is discharged out of the system.
10. The water treatment process according to claim 9, wherein 10ppm of coagulant aid and 0.5ppm of coagulant aid are added into the magnetic reaction zone.
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