CN114560592A

CN114560592A - Granular carbon magnetic coagulation sedimentation tank

Info

Publication number: CN114560592A
Application number: CN202210267976.XA
Authority: CN
Inventors: 贠丹丹; 王陆军; 卑丽艳
Original assignee: Beijing Worlds Water Technology Co ltd
Current assignee: Beijing Worlds Water Technology Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-05-31

Abstract

The invention provides a granular carbon magnetic coagulation sedimentation tank, and relates to the technical field of sewage treatment. The method comprises the following steps: a reaction zone, a carbon adsorption zone and a precipitation zone; magnetic powder is put in the reaction zone and is used for adsorbing suspended matters in the sewage; the settling zone is arranged between the reaction zone and the carbon adsorption zone and comprises a buffer zone and a sludge settling zone, and the sludge settling zone is connected with magnetic sludge recovery equipment; a water distribution channel, a water inlet main pipe, a water distributor air stripping central pipe and a carbon backwashing device are arranged in the carbon adsorption area; granular activated carbon is put into the carbon adsorption area, and the granular activated carbon is coal granular carbon and is used for adsorbing organic pollutants in the sewage; the carbon adsorption area is also provided with an air-lift carbon-adsorption carbon-conveying port which is positioned at the upper end of the carbon backwashing device, and the saturated carbon in the tank body is lifted and conveyed out of the tank body by compressed air and is subjected to adsorption regeneration after being dehydrated and collected out of the tank body, so that the carbon can be recycled.

Description

Granular carbon magnetic coagulation sedimentation tank

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a granular carbon magnetic coagulation sedimentation tank.

Background

In the existing urban sewage treatment plants, along with the continuous development and progress of industrial parks, the yield of industrial wastewater in parks is increased day by day, and the industrial wastewater is often discharged into the urban sewage treatment plants for treatment directly or only after pretreatment, so that the proportion of the industrial wastewater concentrated by the urban sewage treatment plants is increased day by day, the components of the wastewater are complex, and the organic matters which are difficult to degrade are increased, after the wastewater is subjected to biochemical treatment, the proportion of biochemical organic matters in the wastewater is lower, and the COD which is difficult to degrade is further treated by advanced biochemical treatment and difficult to degrade is increased.

In order to further meet the stricter discharge standard and the requirement of reuse water, advanced treatment processes often adopt chemical and physical methods and the like to further remove organic pollutants in water. The hard-to-degrade pollutants in water are removed by using schemes of strong oxidation, flocculation precipitation, filtration and the like. The activated carbon has the characteristics of large surface area, strong adsorption capacity on organic matters and the like, is widely applied to the treatment of the sewage plant in the upgrading and transformation process and the like, improves the impact load resistance of pollutants in the sewage plant, and is commonly used in the guarantee link of emergency high-concentration COD treatment.

The magnetic coagulation sedimentation tank has the advantages of high sedimentation efficiency, stable water outlet performance, small occupied area and the like because the magnetic coagulation sedimentation tank removes SS, TP and other pollutants, and is preferably used in sewage upgrading and reconstruction engineering, but the magnetic coagulation process has low removal effect on organic matters, and only removes about 20 percent of the organic matters while removing suspended matters. In the prior art, for example: the patent numbers are: CN205740628U discloses a novel water purification system, which adopts a carbon-adding and magnetic flocculation sedimentation tank, effectively combines the adsorption performance of activated carbon with the high-speed sedimentation technology of magnetic flocculation, and compared with a pure magnetic flocculation sedimentation tank water purification system, increases a contact tank of powdered activated carbon and sewage, improves the purification capacity of organic matters, chromaticity, turbidity and the like in the sewage treatment process, is typically applied to the advanced treatment of urban sewage and industrial wastewater, can remove COD and BOD, and increases the removal rate of chromaticity, turbidity and the like.

However, the system uses powdered activated carbon, which increases the suspended matter load of the whole system, and the saturated powdered activated carbon is directly conveyed to the subsequent sludge treatment along with the residual sludge, thereby causing resource waste.

Disclosure of Invention

The invention aims to provide a granular carbon magnetic coagulation sedimentation tank to solve the technical problem that activated carbon in a water purification system cannot be deeply recycled in the prior art.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a granular carbon magnetic coagulation sedimentation tank comprises: a reaction zone, a carbon adsorption zone and a precipitation zone;

the reaction area is communicated with the water inlet pipe, and magnetic powder is put in the reaction area and used for adsorbing suspended matters in the sewage;

the settling zone is arranged between the reaction zone and the carbon adsorption zone, the settling zone comprises a buffer zone and a sludge settling zone which are arranged from top to bottom, an input pipe is arranged in the buffer zone, one end of the input pipe is communicated with the output end of the reaction zone through a connector, the bottom of the input pipe extends into the sludge settling zone and is used for uniformly dispersing and distributing sewage in the reaction zone into the sludge settling zone for solid-liquid separation, the buffer zone is communicated with the input end of the carbon adsorption zone, and the sludge settling zone is connected with magnetic sludge recovery equipment;

a water distribution channel, a water inlet main pipe, a gas stripping central pipe, a water distributor and a carbon backwashing device are arranged in the carbon adsorption area; the water distribution channel is used for conveying water treated in the sludge settling area to the water inlet main pipe, the bottom of the water inlet main pipe is communicated with the water distributor, the center inside of the water inlet main pipe penetrates through the gas stripping central pipe, the carbon backwashing device is communicated with the upper end of the gas stripping central pipe, granular activated carbon is put in the carbon adsorption area, and the granular activated carbon is coal granular carbon and is used for adsorbing organic pollutants in sewage;

the carbon adsorption area is also provided with an air-lift carbon adsorption and delivery port which is positioned at the upper end of the carbon backwashing device.

Further, the reaction zone comprises a first reaction tank, a second reaction tank and a third reaction tank which are communicated in sequence;

the first reaction tank is communicated with the water inlet pipe, and a coagulant is put into the first reaction tank;

magnetic powder is put into the second reaction tank and is used for adsorbing suspended matters in the sewage and increasing the specific gravity of the suspended matters;

the third reaction tank is communicated with the buffer zone, and a flocculating agent is added into the third reaction tank;

and stirrers are respectively arranged in the first reaction tank, the second reaction tank and the third reaction tank.

Furthermore, an input pipe is arranged in the buffer area, and a mud bucket is arranged at the bottom of the sludge settling area.

Furthermore, the magnetic mud recovery device comprises a mud pump and a magnetic mud separating and recovering device;

the sludge pump comprises a sludge circulating pump and an external sludge pump, wherein the concentrated sludge at the bottom mud bucket of the sludge settling zone is conveyed into the second reaction tank through the sludge circulating pump;

and the external sludge pump conveys the sludge to a magnetic sludge separation recoverer, and magnetic powder in the sludge is separated and recovered for recycling.

Furthermore, an inclined pipe is arranged in the sludge settling zone, the inclined pipe is positioned above the central sludge scraper, and a water collecting channel is arranged on one side of the buffer zone.

Furthermore, the water inlet main pipe is connected with a water distributor for central water distribution, and the lower end of the gas stripping central pipe is connected with a gas lift pump.

Furthermore, an arch breaking device is arranged in the carbon adsorption area and is positioned below the water distributor.

Furthermore, the device also comprises an air compressor, a pressure stabilizing storage tank and a cold dryer which are sequentially communicated and used for providing an air source for the carbon backwashing device and the arch breaking device.

Furthermore, the carbon adsorption area is provided with a drain pipe, one end of the drain pipe is connected with the carbon backwashing device, and the other end of the drain pipe is connected with the first reaction tank.

Furthermore, the device also comprises a carbon-water mixer and a carbon dehydrator, wherein the carbon-water mixer is communicated with the carbon adsorption area through a pipeline and is used for putting coal granular carbon, and the carbon dehydrator is communicated with the gas stripping carbon adsorption carbon delivery port through a pipeline and is used for externally regenerating the discharged granular activated carbon after dehydration.

By combining the technical scheme, the technical effect analysis realized by the invention is as follows:

1. magnetic powder is put in the reaction zone and is used for adsorbing suspended matters in the sewage and improving the specific gravity of the suspended matters; the settling zone comprises a buffer zone and a sludge settling zone which are arranged from top to bottom, an input pipe is arranged in the buffer zone, one end of the input pipe is communicated with the output end of the reaction zone through a connector, the bottom of the input pipe extends into the sludge settling zone and is used for uniformly dispersing and distributing sewage in the reaction zone into the sludge settling zone for solid-liquid separation, the buffer zone is communicated with the input end of the carbon adsorption zone, and the sludge settling zone is connected with magnetic sludge recovery equipment and is used for separating and recovering magnetic powder in sludge for recycling;

2. a water distribution channel, a water inlet main pipe, an air stripping central pipe, a water distributor and a carbon backwashing device are arranged in the carbon adsorption area; the water distribution channel is used for conveying water treated in the sludge settling zone to the water inlet main pipe, the bottom of the water inlet main pipe is communicated with the water distributor, the center inside of the water inlet main pipe penetrates through the gas stripping central pipe, the carbon backwashing device is communicated with the upper end of the gas stripping central pipe, granular activated carbon is put in the carbon adsorption zone, the granular activated carbon is coal granular carbon, and COD, chromaticity and turbidity are further removed at the position by means of larger specific surface area and pollutant adsorption capacity, so that the effluent water achieves the purification purpose;

the carbon adsorption area is also provided with a gas-stripping carbon-absorbing carbon-conveying port which is positioned at the upper end of the carbon backwashing device, the saturated carbon in the tank body is lifted and conveyed out of the tank body by compressed air, and the saturated carbon is dehydrated and collected out of the tank body and then is adsorbed and regenerated to achieve the purpose of recycling.

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 granular carbon magnetic coagulation sedimentation tank provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a carbon adsorption zone provided in an embodiment of the present invention.

Icon:

1-a stirrer; 2-a coupling; 3-an input pipe; 4-a central mud scraper; 5-a mud bucket; 6-sludge circulating pump; 7-out-feeding sludge pump; 8-magnetic mud separating and recovering device; 9-pipeline centrifugal pump; 10-a telescopic coupling; 11-distributing channel; 12-a water distributor; 14-carbon backwash device; 15-an air compressor; 16-a pressure-stabilizing storage tank; 17-a cold dryer; 18-an arch breaker; 19-gas stripping carbon absorption and delivery port; 20-gathering channel; 21-a drain pipe; 22-a water inlet pipe; 23-a reaction zone; 24-a carbon adsorption zone; 25-a precipitation zone; 26-a buffer zone; 27-a sludge settling zone; 28-a first reaction tank; 29-a second reaction tank; 30-a third reaction tank; 31-an inclined tube; 32-collecting channel; 33-a main water inlet pipe; 34-a central gas stripping tube; 35-a lift pump; 36-charcoal water mixer; 37-charcoal dehydrator.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments and features of the embodiments described below can be combined with each other without conflict.

As shown in fig. 1 and fig. 2, the magnetic coagulation sedimentation tank for granular carbon provided in this embodiment includes: a reaction zone 23, a carbon adsorption zone 24 and a precipitation zone 25;

the reaction zone 23 is communicated with the water inlet pipe 22, and magnetic powder is put into the reaction zone 23 and used for adsorbing suspended matters in the sewage and improving the specific gravity of the suspended matters;

the settling zone 25 is arranged between the reaction zone 23 and the carbon adsorption zone 24, the settling zone 25 comprises a buffer zone 26 and a sludge settling zone 27 which are arranged from top to bottom, an input pipe 3 is arranged in the buffer zone 26, one end of the input pipe 3 is communicated with the output end of the reaction zone 23 through a connector 2, the bottom of the input pipe 3 extends into the sludge settling zone 27 and is used for uniformly dispersing and distributing the sewage in the reaction zone 23 into the sludge settling zone 27 for solid-liquid separation, the buffer zone 26 is communicated with the input end of the carbon adsorption zone 26, and the sludge settling zone 27 is connected with a magnetic sludge recovery device;

the carbon adsorption area 24 is internally provided with a water distribution channel 11, a water inlet main pipe 33, a gas stripping central pipe 34, a water distributor 12 and a carbon backwashing device 14; the water distribution channel 11 is used for conveying water treated in the sludge settling zone 27 to the water inlet main pipe 33, the bottom of the water inlet main pipe is communicated with the water distributor 12, the center inside of the water inlet main pipe 33 penetrates through the gas stripping central pipe 34, the carbon backwashing device 14 is communicated with the upper end of the gas stripping central pipe 34, granular activated carbon is put in the carbon adsorption zone 24, and the granular activated carbon is coal granular carbon and is used for adsorbing organic pollutants in sewage;

the carbon adsorption area 24 is also provided with an air-stripping carbon-absorbing carbon-conveying port 19, and the air-stripping carbon-absorbing carbon-conveying port 19 is positioned at the upper end of the carbon backwashing device 14. The carbon saturated in the tank body is lifted and conveyed to the outside of the tank body through atmospheric air, and is dehydrated and collected outside the tank body for adsorption and regeneration so as to achieve the purpose of recycling.

The structure of the granular carbon magnetic coagulation sedimentation tank is explained in detail as follows:

in an alternative of the embodiment of the present invention, referring to fig. 1 and fig. 2, the reaction zone 23 includes a first reaction tank 28, a second reaction tank 29 and a third reaction tank 30, the second reaction tank 29 is disposed between the first reaction tank 28 and the third reaction tank 30; the three reaction tanks are communicated with each other, and one side of the first reaction tank 28, which is far away from the second reaction tank 29, is connected with the water inlet pipe 22; the side of the third reaction chamber 30 facing away from the second reaction chamber 29 communicates with the buffer zone 26.

Specifically, sewage flows into a first reaction tank 28 from a water inlet pipe 22, and the first reaction tank 28, a second reaction tank 29 and a third reaction tank 30 are connected in series and are all mixing, homogenizing and stirring tanks; furthermore, the first reaction tank 28, the second reaction tank 29 and the third reaction tank 30 are all provided with a stirrer 1, and the stirrer 1 is used for stirring the liquid and the solid uniformly. Of course, the number of different reaction blocks should also be within the scope of the present invention. More preferably, the power of the blender 1 is 1.5 kw.

The reaction zone 23 is divided into different reaction tanks, and sewage is cleaned in a grading way under the action of the different reaction tanks, so that the cleaning effect of the sewage is improved.

In an alternative aspect of the present embodiment, a mixed reagent is disposed within the first reaction chamber 28.

Specifically, a mixed reagent is arranged in the first reaction tank 28, and the mixed reagent includes coagulant and other chemical reagents; wherein under the action of a coagulant, colloidal particles in the sewage are destabilized, and simultaneously under the action of other chemical reagents, the first reaction tank 28 is subjected to chemical reaction, so that soluble phosphate in the sewage is converted into particle precipitates; the suspended substances are reunited with each other by the stirrer 1 and then flow into the second reaction tank 29. More preferably, the adding concentration of the mixed medicament is 20 ppm.

The mixed reagent is arranged in the first reaction tank 28 to realize the destabilization of colloid particles in sewage and the reaction of other chemical reagents, so that the sewage pollutants are reunited into compact flocs, and the initial cleaning of the pollutants is realized.

In an alternative of the embodiment of the present invention, magnetic powder is disposed in the second reaction tank 29.

Specifically, magnetic powder is added into the second reaction tank 29, and the stirrer 1 stirs the wastewater in the second reaction tank 29 to form suspended floc with the magnetic powder as a condensation nucleus, and then the wastewater flows into the third reaction tank 30. More preferably, the specific gravity of the magnetic powder is more than 4.8, the particle size is 100 meshes, and the adding concentration is 5 g/L.

Set up the magnetic in the second reaction tank 29, the realization condenses the pollutant in the sewage, forms the deposit more easily of the big closely knit floc of proportion and gets rid of and then realize the degree of depth cleanness to sewage.

In an alternative of the embodiment of the present invention, a flocculating agent is disposed in the third reaction tank 30.

Specifically, a flocculating agent is added into the third reaction tank 30, and the suspended flocs flowing from the second reaction tank 29 are reduced to be agglomerated into larger and more compact granular flocs through the coordination of adsorption bridging, net capturing and the like. Preferably, the flocculating agent is added at a concentration of 1 ppm.

And a flocculating agent is arranged in the third reaction tank 30, so that the suspended flocs are agglomerated, and further, the sewage is cleaned again.

In an alternative of the embodiment of the invention, the settling zone 25 comprises an upper buffer zone 26 and a lower sludge settling zone 27; an input pipe 3 is arranged in the buffer zone 26, one end of the input pipe 3 is communicated with the output end of the reaction zone 23 through a connector 2, and the bottom of the input pipe 3 extends into the sludge settling zone 27 and is used for uniformly dispersing and distributing the sewage in the reaction zone 23 into the sludge settling zone 27 for solid-liquid separation.

Specifically, the sewage enters the sludge settling zone 27 through the input pipe 3 for rapid settling and sludge concentration, and the sludge settling zone 27 is provided with a central mud scraper 4 for scraping the concentrated sludge to the mud bucket 5. The sludge is rapidly precipitated and separated in the sludge precipitation zone 27, and the micro flocs are trapped in the sludge precipitation zone 27 through the inclined pipe 31 and fall back to the bottom of the sludge precipitation zone 27. The fresh water is collected by a catchment channel 32 arranged in the buffer zone 26. More preferably, the central scraper 4 has a power of 0.75 kw.

The sewage is treated by the sludge settling zone 27 to remove pollutants such as suspended matters, total phosphorus, chromaticity, turbidity and the like, and part of organic matters are removed in the sludge settling zone 27, so that the load of the carbon adsorption zone 24 is reduced, and the adsorption saturation of the activated carbon is delayed.

In an alternative of the embodiment of the invention, the sludge settling zone 27 is provided with a magnetic sludge recovery device.

Specifically, the magnetic mud recovery device comprises a sludge pump and a magnetic mud separating and recovering device 8. The sludge pump comprises a sludge circulating pump 6 and an external sludge pump 7, wherein the concentrated sludge at the sludge hopper 5 is conveyed into the third reaction tank 30 through the sludge circulating pump 6 for internal circulation of the system, so that the flocculation reaction effect is enhanced; and the external sludge pump 7 conveys the sludge to a magnetic sludge separation recoverer 8, and magnetic powder in the sludge is separated and recovered to the system for recycling again. Wherein, the sealing water of the sludge pump and the washing water of the magnetic sludge separating and recovering device 8 are both delivered to the water consumption point of the corresponding equipment by the pipeline centrifugal pump 9. Preferably, the flow rate of the sludge circulating pump 6 is 10m³H, the lift is 10 m; an external sludge pump 7 with the flow rate of 10m³H, the lift is 10 m; the flow rate of the pipeline centrifugal pump 9 is 10m³H, the lift is 30 m.

In an alternative of this embodiment, the third reaction cell 30 is connected to the input pipe 3 by a coupling 2.

Specifically, the input pipe 3 adopts a circular bell mouth pipe for water distribution, sewage slowly flows into the bottom of the sludge settling zone 27, and the water flows downwards to bring downward inertia force of floc particles, so that the floc particles are easier to settle, and the sludge layer of the sludge settling zone 27 is not impacted.

In an alternative of this embodiment, an inclined pipe 31 is arranged in the sludge settling zone 27, the inclined pipe 31 is positioned above the central mud scraper 4, and a water collecting channel 91 is arranged on one side of the buffer zone 26.

In an alternative of this embodiment, the carbon adsorption zone 24 is connected to the settling zone 25 by means of a telescopic coupling 10.

The telescopic coupling 10 realizes the connection and the communication between the carbon adsorption area 24 and the sedimentation tank area 25.

In an alternative of this embodiment, the water distributor 12 is configured to control the flow of water from the water distributor 12 to the main water inlet pipe 33.

Specifically, the sewage treated in the previous process directly enters the water distributor 12 of the carbon adsorption zone 24, and uniformly enters the water distributor 12 at the bottom of the carbon adsorption zone 24 through the water distribution channel 11, and the water distributor 12 distributes water by adopting radial branch pipes at the center of a star shape, so that the uniform water distribution at the bottom of the carbon adsorption zone 24 is ensured; and the water flow is in an upward flow mode, and the carbon layer is in a downward movement mode, so that the suspended matter adsorption capacity of the carbon adsorption area 24 is increased while the water distribution is uniform. Of course, other forms of the water distributor 12 are also within the scope of the present invention.

The water distributor 12 is arranged at the bottom of the carbon adsorption zone 24, so that water distribution is uniform and adsorption capacity is improved.

In the alternative of the embodiment of the invention, the carbon adsorption zone 24 adopts granular activated carbon with the particle size specification of 2-6mm, the iodine adsorption value of 800 and the adsorption load ratio of 10: 1. The surface area of the granular activated carbon and the adsorption capacity of pollutants are large, the cleaning effect on organic matters, chromaticity and turbidity can be improved, and the purification of sewage is further realized.

In an alternative embodiment of the present invention, to ensure proper operation of the carbon adsorption zone 24, the granular activated carbon is cleaned using the carbon backwash 14. Wherein the granular activated carbon at the bottom of the carbon adsorption zone 24 is lifted to the action part of the carbon backwashing device 14 through a gas stripping central pipe 34 and a gas stripping pump 35 by virtue of the gas stripping action of compressed air. In the charcoal backwash ware 14, under the joint disturbance of compressed air and clear water, wash adnexed suspended solid and the pollutant of desorption on the granule active carbon to fall clean granule active carbon from charcoal backwash ware 14 in to the charcoal filter layer, whole charcoal layer from the top down removes, has both reached the secondary washing of the clear water of upflow, has avoided the charcoal layer again because of the hardening of long-time fixed production, has realized carrying out the backwash of charcoal simultaneously when system's absorption moves. Preferably, the compressed air for the carbon backwashing device 14 and the arch breaking device 18 is provided by an air compressor 15, a pressure stabilizing storage tank 16 and a refrigeration dryer 17 system. More preferably, the amount of compressed air is 1m³Min, nominal pressure 8 bar.

The carbon backflusher 14 achieves cleaning of the granular activated carbon and achieves self-cleaning of the granular activated carbon.

In an alternative of this embodiment, the carbon adsorption zone 24 comprises a drain 21, one end of the drain 21 is connected to the carbon backwashing device 14, and the other end is connected to the first reaction tank 28.

The cleaning sewage in the carbon backwashing device 14 is discharged through the outlet of the water discharge pipe 21 and discharged into the first reaction tank 28 at the front section for coagulation sedimentation treatment.

In the alternative of this embodiment, the carbon adsorption zone 24 is provided with the arch breaker 18, and the arch breaker 18 is located below the water distributor 12.

Because the particle activated carbon is low in density and light in weight, in order to ensure that the carbon filter layer can effectively move downwards for circular backwashing in the backwashing process of the carbon backwashing device 14, compressed air is introduced into the bottom of the carbon adsorption area 24, and the arch breaking device 18 is arranged, so that the activated carbon is prevented from being blocked and hardened in the circulating process.

In the alternative of this embodiment, the gas stripping carbon absorption mouth 19 that sets up in the carbon adsorption district 24 promotes the active carbon that moves saturation in the carbon adsorption district 24 through compressed air and carries to the carbon adsorption district 24 outside, collects the back outside the carbon adsorption district 24 and adsorbs regeneration to reach reuse.

In the alternative of this embodiment, still include charcoal water blender 36 and charcoal dehydrator 37, charcoal water blender 36 communicates with carbon adsorption zone 24 through the pipeline for throw in coal quality granule carbon, and charcoal dehydrator 37 communicates with gas stripping carbon absorption carbon delivery mouth 19 through the pipeline for carry out the external regeneration after the dehydration to discharged particulate matter active carbon.

In an alternative embodiment, the sewage is discharged after entering the collecting channel 20 after being subjected to adsorption filtration.

The sewage is discharged from the collecting channel 20, and is convenient to recycle. The SS of the effluent target water quality is less than or equal to 10mg/L, TP is less than or equal to 0.1mg/L, COD is less than or equal to 30mg/L, and the overall effluent water quality reaches the IV-class water standard of surface water.

The working principle of the granular carbon magnetic coagulation sedimentation tank provided by the embodiment is explained as follows:

the integrated device of the granular carbon magnetic coagulation sedimentation tank is mainly divided into a reaction zone, a sedimentation zone and a carbon adsorption zone, which are formed. Sewage gets into the reaction zone through the inlet tube, and the reaction zone divides into 3 first reaction tanks, second reaction tank and the third reaction tank that establish ties in proper order, is mixed homogeneity stirring pond, has all arranged the mixer wherein, carries out the mixed homogeneity stirring of liquid solid.

Adding a mixed medicament into a first reaction tank, destabilizing colloidal particles in sewage under the action of a coagulant, simultaneously carrying out chemical reaction in the first reaction tank to convert soluble phosphate into particle precipitates, enabling various suspended matters to be agglomerated with each other again under the action of mixing and stirring, then entering a second reaction tank, then adding magnetic powder into the second reaction tank, enabling the specific gravity of the magnetic powder to be larger than 4.8, the particle size to be 100 meshes and the adding concentration to be 5g/L, mixing, stirring and homogenizing to form suspended flocs taking the magnetic powder as a coagulation nucleus, then entering a third reaction tank, adding a flocculating medicament with the adding concentration of 1ppm, agglomerating the suspended flocs into larger particles and more compact flocs under the actions of adsorption bridging, net capturing and the like, then entering a buffer zone along with the flow of water, wherein a coupler and an input pipe are arranged in the buffer zone, and the coupler is connected with the third reaction tank and a sludge settling zone, the sewage enters a settling zone for rapid settling through buffering, and the sludge is concentrated.

The mud settling zone sets up central type mud scraper, and the power of mud scraper is 0.75kw for scrape concentrated mud and send to the bagger department, the input tube adopts round horn mouth pipe to carry out the water distribution, and rivers slowly flow in the bottom of settling zone, and the inflow flow direction is down in order to bring the decurrent inertial force of flocculating constituent granule, makes flocculating constituent granule subsides more easily, can not cause the impact to bottom mud layer. Mud carries out the rapid sedimentation separation in the sludge settling zone, and small floc passes through the pipe chute and holds back wherein, finally falls back to the cell body, and the clear water is finally collected through the catch basin, has reached getting rid of pollutant such as suspended solid, total phosphorus, colourity, turbidity to partial COD gets rid of here for the first time, gets rid of efficiency and reaches 20%, and the carbon adsorption district has reduced the organic matter load, and is favorable to delaying the absorption saturation of active carbon.

In order to strengthen the flocculation reaction effect, concentrated sludge at a sludge hopper of the sludge settling zone is conveyed into a third reaction tank through a circulating sludge pump, sludge is conveyed to a magnetic sludge separation and recovery system through an outward conveying sludge pump, magnetic powder in the sludge is separated and recovered into the system for recycling again, and the recovery efficiency reaches 99.7%. Wherein, the sealing water of the sludge pump and the washing water of the magnetic sludge system are both pipeline centrifugal pumps. And respectively pumping the tap water or the reuse water to the water consumption points of the corresponding equipment.

The carbon adsorption area is connected with the sludge settling area through a telescopic connector, clear water directly enters a water distributor of the carbon adsorption area and uniformly enters a water distributor at the bottom of the carbon adsorption area through water distribution, and the water distributor distributes water through radial branch pipes at the center of a star shape, so that the water distribution at the bottom of a carbon layer is uniform. The upward flow mode is adopted, so that the water distribution is more uniform, the pollutant carrying capacity of suspended matters in the adsorption tank is increased, and the backwashing interval time is prolonged. The carbon adsorption tank adopts granular activated carbon, the activated carbon is coal granular activated carbon, the grain size of the activated carbon is 2-6mm, the iodine adsorption value is 800, and the adsorption load ratio is 10: 1. The COD, the chroma and the turbidity are further removed at the position by depending on larger specific surface area and pollutant adsorption capacity, so that the effluent reaches the purification purpose.

In order to ensure the normal operation of the carbon adsorption tank, the activated carbon is cleaned by intermittent air stripping by using carbon backwashing gas, and the backwashing period is 4-6 h/d. Rely on compressed air's air stripping effect, mention top carbon backwash ware effect position with the charcoal of bottom through the compressed air pipe, under the joint disturbance of compressed air and clear water, wash out adnexed suspended solid and the pollutant of desorption simultaneously on the active carbon charcoal granule, fall into the charcoal filtering layer in the active carbon backwash ware route clean, reach the secondary washing of the clear water of upflow, it discharges through backwash drainage outlet to wash sewage, discharge the anterior segment reaction zone of front end magnetism coagulating sedimentation tank, carry out the coagulating sedimentation and handle, backwash water yield does not exceed 3%, finally reach the pollutant through discharging surplus mud and get rid of the purpose, emission time intermittent type 6h operation.

Wherein, the compressed air of the air stripping air source of the carbon backwashing device is provided by an air compressor, a cold dryer and a pressure stabilizing storage tank system. The amount of compressed air is 1m³The method is characterized by comprising the following steps of (1)/min, rated pressure of 8bar, small density and light weight of activated carbon, large selected particle size, and in order to ensure that a carbon filter layer can effectively move downwards for circular backwashing in the backwashing process, introducing compressed air into a path around a carbon guide hopper at the bottom, and arranging an air arch breaking device to prevent the activated carbon from being blocked and hardened in the circulating process and periodically breaking the arch by air in the backwashing process.

In addition, the carbon adsorption unit is also provided with a gas stripping carbon adsorption and delivery port 19, the saturated carbon in the tank body is lifted and delivered out of the tank body through compressed air, the carbon is dehydrated and collected out of the tank body and then is subjected to adsorption regeneration, so that the carbon can be reused, the regeneration cycle time is 6 months, and finally the water after the sewage is adsorbed and filtered is totally collected into a water outlet. Finally, in the process of engineering advanced treatment, the effluent target water quality SS is less than or equal to 10mg/L, TP is less than or equal to 0.1mg/L, COD is less than or equal to 30mg/L, and the overall effluent quality reaches the standard of surface water IV.

In the technical scheme of the application:

1. the post-positioned activated carbon adsorption unit is adopted, the activated carbon is coal granular carbon, the mixing of the activated carbon in a magnetic precipitation system is avoided, and the activated carbon can be sucked out and conveyed to the outside of the system for regeneration after being adsorbed and saturated, so that the cyclic utilization of resources is realized;

2. the load for removing organic matters is high, and the impact load is resistant, so that the optimal scheme for effectively solving the problem that the COD exceeds the standard in emergency treatment of a sewage treatment plant is provided;

3. can effectively remove pollutants such as suspended matters, total phosphorus, COD, chromaticity, turbidity and the like, and is suitable for upgrading and transforming of municipal sewage treatment plants and treatment of refractory organic matters in industrial wastewater.

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 the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A granular carbon magnetic coagulation sedimentation tank is characterized by comprising: a reaction zone (23), a carbon adsorption zone (24) and a precipitation zone (25);

the reaction zone (23) is communicated with the water inlet pipe (22), and magnetic powder is put into the reaction zone (23) and is used for adsorbing suspended matters in the sewage;

the settling zone (25) is arranged between the reaction zone (23) and the carbon adsorption zone (24), the settling zone (25) comprises a buffer zone (26) and a sludge settling zone (27) which are arranged from top to bottom, an input pipe (3) is arranged in the buffer zone (26), one end of the input pipe (3) is communicated with the output end of the reaction zone (23) through a connector (2), the bottom of the input pipe (3) extends into the sludge settling zone (27) and is used for uniformly dispersing and distributing sewage in the reaction zone (23) into the sludge settling zone (27) for solid-liquid separation, the buffer zone (26) is communicated with the input end of the carbon adsorption zone (26), and the sludge settling zone (27) is connected with a magnetic sludge recovery device;

a water distribution channel (11), a water inlet main pipe (33), a gas stripping central pipe (34), a water distributor (12) and a carbon backwashing device (14) are arranged in the carbon adsorption area (24); the water distribution channel (11) is used for conveying water treated in the sludge settling zone (27) to a water inlet main pipe (33), the bottom of the water inlet main pipe is communicated with a water distributor (12), the center inside of the water inlet main pipe (33) penetrates through a gas stripping central pipe (34), the carbon backwashing device (14) is communicated with the upper end of the gas stripping central pipe (34), granular activated carbon is put in the carbon adsorption zone (24), and the granular activated carbon is coal granular carbon and is used for adsorbing organic pollutants in sewage;

the carbon adsorption area (24) is also provided with a gas stripping carbon adsorption and delivery port (19), and the gas stripping carbon adsorption and delivery port (19) is positioned at the upper end of the carbon backwashing device (14).

2. The granular carbon magnetic coagulation sedimentation tank according to claim 1, wherein the reaction zone (23) comprises a first reaction tank (28), a second reaction tank (29) and a third reaction tank (30) which are communicated in sequence;

the first reaction tank (28) is communicated with the water inlet pipe (22), and a coagulant is put into the first reaction tank (28);

magnetic powder is put into the second reaction tank (29) and is used for adsorbing suspended matters in the sewage and increasing the specific gravity of the suspended matters;

the third reaction tank (30) is communicated with the buffer zone (26), and a flocculating agent is added into the third reaction tank (30);

and stirrers (1) are respectively arranged in the first reaction tank (28), the second reaction tank (29) and the third reaction tank (30).

3. The granular carbon magnetic coagulation sedimentation tank of claim 1, wherein a mud bucket (5) is provided at the bottom of the sludge sedimentation zone (27).

4. The granular carbon magnetic coagulation sedimentation tank as claimed in claim 2, wherein the magnetic sludge recovery device comprises a sludge pump and a magnetic sludge separation recoverer (8);

the sludge pump comprises a sludge circulating pump (6) and an outward sludge pump (7), wherein the concentrated sludge at the bottom hopper (5) of the sludge settling zone (27) is conveyed into the second reaction tank (29) through the sludge circulating pump (6);

and the external sludge pump (7) conveys the sludge to a magnetic sludge separation recoverer (8), and magnetic powder in the sludge is separated and recovered for recycling.

5. The granular carbon magnetic coagulation sedimentation tank according to claim 3, characterized in that an inclined pipe (31) is arranged in the sludge sedimentation zone (27), the inclined pipe (31) is positioned above the central mud scraper (4), and a water collecting channel (91) is arranged on one side of the buffer zone (26).

6. The granular carbon magnetic coagulation sedimentation tank of claim 1, wherein the main water inlet pipe (33) is connected with a water distributor (12) for central water distribution, and the lower end in the stripping central pipe is connected with an air lift pump (35).

7. The granular carbon magnetic coagulation sedimentation tank of claim 1, wherein an arch breaker (18) is provided in the carbon adsorption zone (24), and the arch breaker (18) is located below the water distributor (12).

8. The granular carbon magnetic coagulation sedimentation tank of claim 7, further comprising an air compressor (15), a pressure-stabilizing storage tank (16) and a cold dryer (17) which are sequentially communicated and used for providing an air source for the carbon backwashing device (14) and the arch breaker (18).

9. The granular carbon magnetic coagulation sedimentation tank as claimed in claim 2, wherein the carbon adsorption zone (24) is provided with a drain pipe (21), one end of the drain pipe (21) is connected with the carbon backwashing device (14), and the other end is connected with the first reaction tank (28).

10. The granular carbon magnetic coagulation sedimentation tank of claim 1, further comprising a carbon-water mixer (36) and a carbon dehydrator (37), wherein the carbon-water mixer (36) is communicated with the carbon adsorption zone (24) through a pipeline and used for putting coal granular carbon, and the carbon dehydrator (37) is communicated with the gas stripping carbon adsorption carbon delivery port (19) through a pipeline and used for externally regenerating the discharged granular activated carbon after being dehydrated.