IC reaction device for high-calcium wastewater

Abstract

The utility model provides an IC reaction device for high-calcium wastewater, the interior of the IC reactor is divided into a calcified sludge collecting area and an anaerobic reaction area from bottom to top, the calcified sludge collecting area is provided with a sludge bucket for collecting calcified sludge, and the calcified sludge accumulated in the sludge bucket can be flushed out of the IC reactor by arranging a sludge flushing water inlet pipe and a sludge discharge pipe; the utility model further provides an external circulation unit, and a part of purified effluent can be used as circulating water to adjust the ascending velocity in the IC reactor, improve the contact between granular sludge and wastewater, dilute high-concentration wastewater inflow and enhance the impact resistance of the IC reactor.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to an IC reaction device for high-calcium wastewater. Background Art

[0002] The internal circulation anaerobic reactor (IC anaerobic reactor for short) is pumped into the reactor by a high-lift water pump through a water replenishment system, and the incoming water and the circulating sludge in the water replenishment system are fully mixed. A granular sludge expansion bed is set in the first reaction zone of the reactor, where most of the COD is converted into biogas. The biogas generated in the reaction zone is collected by the bottom three-phase separator and the gas generated thereby carries water and sludge to the gas-liquid separator at the top of the reactor, where the biogas is separated from the mud-water mixture and leaves the reactor, and the mud-water mixture flows directly downward to the bottom of the reactor through the central downcomer, forming an internal cycle. The effluent from the first reaction zone enters the second reaction zone for further treatment. The second reaction zone is called the low-load treatment area, where the remaining biodegradable COD is removed. The biogas generated in the second reaction zone is collected by the upper three-phase separator.

[0003] The IC anaerobic reactor is a new generation of efficient reactor for sewage treatment. However, in actual application, in the treatment of wastewater with high calcium ion content such as papermaking wastewater and leather wastewater, the pH and alkalinity of the IC anaerobic reactor will be controlled to prevent acidification, resulting in the accumulation of calcium retention after long-term operation, which will cause the sludge to calcify. The calcified sludge will be deposited at the bottom of the reactor due to its increased mass, which will reduce the sludge concentration of the reactor and the wastewater treatment capacity. Even if it is not treated for a long time, it will wear out the existing granular sludge, causing the reactor to run mud and pollute the effluent. The traditional IC anaerobic reactor only has internal circulation, and the muddy water carried by the generated biogas increases the rising flow rate inside the reactor. However, when the water quality fluctuates, such as the COD concentration decreases, it is difficult to maintain the rising flow rate required by the reactor, and the reactor is susceptible to shock. Utility Model Content

[0004] In view of the problems that when the existing IC anaerobic reactor treats calcium-containing wastewater, the calcified sludge leads to a reduction in wastewater treatment capacity, and the single internal circulation has an unstable flow rate and poor impact resistance when the water quality fluctuates, the utility model provides an IC reaction device for high-calcium wastewater. By arranging a mud flushing water inlet pipe and a mud discharge pipe, the calcified sludge accumulated in the mud hopper can be flushed out of the IC reactor, thereby improving the treatment efficiency of the IC reactor. An external circulation unit is also provided, and a part of the purified water can be used as circulating water to adjust the rising flow rate in the IC reactor, improve the contact between the granular sludge and the wastewater, and dilute the high-concentration wastewater inlet to enhance the impact resistance of the IC reactor.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An IC reaction device for high-calcium wastewater comprises: an IC reactor, a water inlet main pipe, a water inlet branch pipe and a calcified sludge treatment unit; the interior of the IC reactor is divided into a calcified sludge collection area and an anaerobic reaction area from bottom to top; the water inlet main pipe is used to transport wastewater to be treated; the water inlet branch pipe is arranged between the calcified sludge collection area and the anaerobic reaction area, and the water inlet branch pipe is connected with the water inlet main pipe; the calcified sludge collection area is provided with a mud bucket for collecting calcified sludge, and the mud bucket is provided with a mud flushing water inlet and a mud discharge port; the calcified sludge treatment unit comprises a mud flushing water inlet pipe and a mud discharge pipe, one end of the mud flushing water inlet pipe is connected with the mud flushing water inlet, and the other end is connected with the water inlet main pipe, so as to pass the wastewater in the water inlet main pipe into the mud bucket to flush the calcified sludge; the mud discharge pipe is connected with the mud discharge port to discharge the calcified sludge flushed from the mud bucket.

[0007] In some embodiments, the anaerobic reaction zone includes, from bottom to top: a first anaerobic reaction zone, a second anaerobic reaction zone and a effluent zone; a first three-phase separator is provided between the first anaerobic reaction zone and the second anaerobic reaction zone, and the first three-phase separator is used to separate the biogas, treated wastewater and granular sludge produced by the reaction in the first anaerobic reaction zone; a second three-phase separator is provided between the second anaerobic reaction zone and the effluent zone, and the second three-phase separator is used to separate the biogas, treated wastewater and granular sludge produced by the reaction in the second anaerobic reaction zone.

[0008] In some embodiments, it also includes: a gas-liquid separation tank, a first biogas riser, a second biogas riser and a sludge downpipe, the first three-phase separator is connected to the first air inlet of the gas-liquid separation tank through the first biogas riser, and the second three-phase separator is connected to the second air inlet of the gas-liquid separation tank through the second biogas riser; the gas-liquid separation tank is used to perform gas-liquid separation on the biogas carrying mud and water collected by the first three-phase separator and the second three-phase separator, respectively, to obtain biogas and mud and water; one end of the sludge downpipe is connected to the liquid outlet of the gas-liquid separation tank, and the other end of the sludge downpipe extends to the bottom of the first anaerobic reaction zone.

[0009] In some embodiments, the IC reaction device also includes an external circulation unit, which includes: an outlet pipe; the outlet area, the outlet pipe, the inlet main pipe and the inlet branch pipe are connected in sequence to form the external circulation unit, and a portion of the purified water discharged from the outlet area is used as circulating water and re-enters the IC reactor through the external circulation unit for reaction.

[0010] In some embodiments, the external circulation unit also includes: an external circulation riser, a circulation riser outlet pipe and a wastewater inlet main pipe, the interior of the external circulation riser is divided into a circulating water mixing zone and a purified water outlet zone from bottom to top, the inlet of the purified water outlet zone is connected to the outlet of the outlet pipe, and the outlet of the purified water outlet zone is connected to the circulation riser outlet pipe; the inlet of the circulating water mixing zone is connected to the wastewater inlet main pipe, and the outlet of the circulating water mixing zone is connected to the inlet main pipe; the purified water discharged from the outlet zone enters the purified water outlet zone, a part of the purified water is discharged through the circulation riser outlet pipe, and the other part of the purified water falls from the purified water outlet zone to the circulating water mixing zone, and is mixed with the wastewater to be treated sent in by the wastewater inlet main pipe and then sent into the IC reactor through the inlet main pipe.

[0011] In some embodiments, the water inlet branch pipe is provided with a plurality of evenly distributed water outlets, and the water outlets are directed toward the calcified sludge collection area; and / or, a water distributor is further provided in the IC reactor, and the water distributor is arranged on the water inlet branch pipe for evenly distributing the wastewater to be treated entering the anaerobic reaction zone.

[0012] In some embodiments, a circulation pump is provided on the water inlet main pipe, and the circulation pump is used to provide conveying power for the circulating water in the external circulation unit.

[0013] In some embodiments, the wastewater inlet main pipe is provided with an inlet pump, and the inlet pump is used to provide conveying power for the wastewater to be treated.

[0014] In some embodiments, it further includes: a biogas pipe, wherein both ends of the biogas pipe are respectively connected to the gas outlet of the gas-liquid separation tank and the subsequent biogas treatment system, and is used to send the biogas separated from the mud and water to the subsequent system for treatment.

[0015] In some embodiments, a mud flushing water inlet control butterfly valve is provided on the mud flushing water inlet pipe, and a mud discharge control gate valve is provided on the mud discharge pipe.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The sludge flushing water inlet pipe and sludge discharge pipe provided by the utility model can flush the sludge bucket inside the IC reactor, flush the calcified sludge with high density accumulated in the sludge bucket out of the IC reactor, reduce the proportion of inorganic components in the granular sludge, maintain the sludge activity, thereby maintaining the high efficiency of the anaerobic digestion process, and also help maintain the COD removal rate of the IC reactor, ensuring that the wastewater treatment efficiency is not reduced due to sludge calcification;

[0018] 2. Compared with the existing IC reactor, the external circulation unit provided in the present application can optimize the wastewater distribution and improve the contact between the wastewater and the granular sludge. The simultaneous operation of the internal circulation and the external circulation can provide a more stable rising flow rate for the IC reactor. The external circulation also provides additional dilution capacity, and the purified effluent is used to dilute the wastewater inlet to be treated, so that the water quality entering the IC reactor is more stable, reducing the problem of excessive or low local concentration in the reactor, helping to maintain the stability of the internal environment of the IC reactor and improving the impact resistance of the IC reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic structural diagram of an IC reaction device for high-calcium wastewater provided by the utility model.

[0021] The meanings of the symbols in the accompanying drawings are as follows:

[0022] 1—IC reactor; 2—mud hopper; 3—water inlet branch pipe; 4—first anaerobic reaction zone; 5—first three-phase separator; 6—second anaerobic reaction zone; 7—second three-phase separator; 8—water outlet zone;

[0023] 9—mud flushing water inlet pipe; 10—mud flushing water inlet control butterfly valve; 11—mud discharge pipe; 12—mud discharge control gate valve;

[0024] 13—first biogas ascending pipe; 14—second biogas ascending pipe; 15—gas-liquid separation tank; 16—sludge descending pipe; 17—biogas pipe;

[0025] 18—water outlet pipe; 19—water inlet main pipe; 20—circulation pump;

[0026] 21—External circulation riser; 22—Circulation riser outlet pipe; 23—Wastewater inlet main pipe; 24—Inlet pump. DETAILED DESCRIPTION

[0027] The present invention is further explained in detail below in conjunction with the drawings and descriptions of specific embodiments. However, the following descriptions including the embodiments are only used to enable ordinary technicians in the technical field to which the present invention belongs to more clearly understand the principles and essence of the present invention, and do not mean any form of limitation on the present invention.

[0028] like Figure 1 As shown, this embodiment provides an IC reaction device for high-calcium wastewater, including: an IC reactor 1, a water inlet main pipe 3, a water inlet branch pipe 19 and a calcified sludge treatment unit.

[0029] The interior of the IC reactor 1 is divided into a calcified sludge collection area and an anaerobic reaction area from bottom to top. The water inlet main pipe 3 is used to transport the wastewater to be treated to the IC reactor 1. The water inlet branch pipe 3 is arranged between the calcified sludge collection area and the anaerobic reaction area. More specifically, the water inlet branch pipe 3 is arranged between the calcified sludge collection area and the first anaerobic reaction area 4, and the water inlet branch pipe 19 is connected to the water inlet main pipe 3. The wastewater to be treated rises through the water inlet branch pipe 19 into the anaerobic reaction area for purification.

[0030] The calcified sludge collection area is provided with a mud hopper 2 for collecting calcified sludge. After the calcium-containing wastewater to be treated reacts with the granular sludge in the anaerobic reaction area, part of the granular sludge is calcified and falls down to be collected by the mud hopper 2.

[0031] The mud hopper 2 is provided with a mud flushing water inlet and a mud discharge port (not shown in the figure), and the calcified sludge treatment unit includes a mud flushing water inlet pipe 9 and a mud discharge pipe 11. One end of the mud flushing water inlet pipe 9 is connected to the mud flushing water inlet, and the other end is connected to the water inlet main pipe 3. The wastewater in the water inlet main pipe 3 is passed into the mud hopper 2 to flush the calcified sludge, and the mud discharge pipe 11 is connected to the mud discharge port to discharge the calcified sludge flushed from the mud hopper 2. Regularly cleaning the calcified particles accumulated in the mud hopper 2 can better protect the uncalcified granular sludge in the IC reactor 1 and avoid a decrease in wastewater treatment efficiency.

[0032] Preferably, a mud flushing water inlet control butterfly valve 10 is provided on the mud flushing water inlet pipe 9 to control the flushing water inlet, and a mud discharge control gate valve 11 is provided on the mud discharge pipe 11 to control the mud discharge from the mud discharge pipe 11.

[0033] In some embodiments, the anaerobic reaction zone includes, from bottom to top, a first anaerobic reaction zone 4, a second anaerobic reaction zone 6 and an outlet zone 8. A first three-phase separator 5 is provided between the first anaerobic reaction zone 4 and the second anaerobic reaction zone 6. The first three-phase separator 5 separates the biogas generated by the reaction of the wastewater and the granular sludge in the first anaerobic reaction zone 4, the treated wastewater and the granular sludge. The treated wastewater rises to the second anaerobic reaction zone 6 for further purification.

[0034] A second three-phase separator 7 is provided between the second anaerobic reaction zone 6 and the effluent zone 8 , and the second three-phase separator 7 separates the biogas generated by the reaction in the second anaerobic reaction zone 6 , the treated wastewater and the granular sludge.

[0035] Furthermore, the IC reaction device also includes: a gas-liquid separation tank 15 , a first biogas ascending pipe 15 , a second biogas ascending pipe 14 and a sludge descending pipe 16 .

[0036] The first three-phase separator 5 is connected to the first air inlet of the gas-liquid separation tank 15 through the first biogas riser 15, the second three-phase separator 7 is connected to the second air inlet of the gas-liquid separation tank 15 through the second biogas riser 14, one end of the sludge downpipe 16 is connected to the liquid outlet of the gas-liquid separation tank 15, and the other end of the sludge downpipe 16 extends to the bottom of the first anaerobic reaction zone 4.

[0037] The gas-liquid separation tank 15 separates the biogas and muddy water from the biogas carrying muddy water collected by the first three-phase separator 5 and the second three-phase separator 7 respectively, and the obtained biogas is discharged from the gas outlet of the gas-liquid separation tank 15, while the separated muddy water returns to the first anaerobic reaction zone 4 through the sludge downcomer 16 to react with the wastewater again, forming an internal circulation of the IC reactor 1.

[0038] The first air inlet and the second air inlet mentioned above can be the same, that is, the gas-liquid separation tank 15 is only provided with one air inlet, and the first biogas riser 15 and the second biogas riser 14 are both connected to the air inlet.

[0039] More preferably, the gas-liquid separation tank 15 is disposed on the top of the IC reactor 1 .

[0040] Furthermore, the IC reaction device is also provided with a biogas pipe 17, both ends of which are respectively connected to the gas outlet of the gas-liquid separation tank 15 and the subsequent biogas treatment system, and the biogas separated from the muddy water is sent to the subsequent system for treatment.

[0041] The IC reaction device also includes an external circulation unit, which includes: an outlet pipe 18, an outlet area, an outlet pipe, an inlet main pipe 19 and an inlet branch pipe 3 are connected in sequence to form the external circulation unit. A part of the purified water discharged from the outlet area 8 is used as circulating water to re-enter the IC reactor 1 through the external circulation unit for reaction, thereby adjusting the rising flow rate in the IC reactor 1.

[0042] Preferably, a circulation pump 20 is provided on the water inlet main pipe 19, and the circulation pump 20 is used to provide conveying power for the circulating water in the external circulation unit.

[0043] Furthermore, the IC reaction device also includes: an external circulation riser 21, a circulation riser outlet pipe 22 and a wastewater inlet main pipe 23, wherein the interior of the external circulation riser 21 is divided into a circulating water mixing zone and a purified water outlet zone from bottom to top, the inlet of the purified water outlet zone is connected to the outlet of the outlet pipe 18, and the outlet of the purified water outlet zone is connected to the circulation riser outlet pipe 22; the inlet of the circulating water mixing zone is connected to the wastewater inlet main pipe 23, and the outlet of the circulating water mixing zone is connected to the water inlet mother pipe 19, that is, in this embodiment, the water outlet pipe 19, the external circulation riser 21, the water inlet mother pipe 19 and the water inlet branch pipe 3 are connected in sequence to form an external circulation unit.

[0044] The purified water in the outlet area 8 enters the purified water outlet area of ​​the external circulation riser 21 through the outlet pipe 18. A part of the purified water is discharged through the circulation riser outlet pipe 22 for subsequent treatment, while the other part of the purified water falls from the purified water outlet area to the circulating water mixing area, and after being mixed with the wastewater to be treated sent in by the wastewater inlet main pipe 23, it is sent into the first anaerobic reaction area 4 in the IC reactor 1 through the inlet main pipe 19.

[0045] The external circulation unit can help improve the contact between wastewater and activated sludge and enhance mass transfer efficiency, especially when the wastewater composition is complex or the concentration fluctuates greatly. It can also mix the contents of IC reactor 1 more evenly, reduce the problem of local concentration being too high or too low, help maintain the stability of the internal environment of the reactor, and improve the reactor's resistance to high-concentration wastewater shock loads.

[0046] Preferably, the wastewater inlet main pipe 23 is connected to an inlet pump 24, and the inlet pump 24 can provide conveying power for the wastewater to be treated.

[0047] In some embodiments, the inlet of the mud flushing water inlet pipe 9 is connected to the water inlet main pipe 19, and the circulating water (or the mixed water of circulating water and wastewater to be treated) in the water inlet main pipe 19 is passed into the mud hopper 2 for flushing, and the mud discharge control gate valve 11 is opened to discharge the calcified sludge accumulated in the mud hopper 2 from the mud discharge pipe 11.

[0048] In some embodiments, the water inlet branch pipe 3 is provided with a plurality of evenly distributed water outlets, and the water outlets are directed toward the calcified sludge collection area. That is, after the circulating water (or the mixed water of circulating water and wastewater to be treated) transported from the water inlet main pipe 19 enters the water inlet branch pipe 3, the water is distributed vertically downward from the water outlet, thereby increasing the contact time between the granular sludge and the pollutants in the wastewater to be treated.

[0049] In some embodiments, a water distributor (not shown in the figure) is also provided inside the IC reactor 1, and the water distributor is arranged between the water inlet branch pipe 3 and the anaerobic reaction zone, that is, the water inlet branch pipe 3 and the first anaerobic reaction zone 4, so as to evenly distribute the wastewater to be treated (or the mixed water of circulating water and wastewater to be treated) entering the first anaerobic reaction zone 4.

[0050] In summary, the operation process of the IC reaction device provided by the utility model is briefly described as follows:

[0051] Under the action of the water inlet pump 24, the wastewater to be treated is pumped into the external circulation riser 21 (at the initial start-up stage, the IC reactor 1 does not produce purified water. At this time, the wastewater to be treated directly enters the IC reactor 1 through the water inlet main pipe 19. After running for a period of time, the purified water flows into the water outlet area 8 and flows into the external circulation riser 21 through the water outlet pipe 18. A part of the purified water is discharged into the downstream treatment system from the circulation riser outlet pipe 22, while the other part of the purified water is directly returned to the IC reactor 1 through the water inlet main pipe 19 as circulating water, or is mixed with the wastewater to be treated and then sent to the IC reactor 1). The wastewater is sent to the IC reactor 1 through the water inlet main pipe 19 for an internal circulation process: the water inlet branch pipe 19 distributes water downward, and the wastewater to be treated and the particles are mixed with each other. The granular sludge continues to rise after contact, and enters the first anaerobic reaction zone 4 for reaction after being evenly distributed by the water distributor. After the reaction, the mud, water and gas mixed liquid carrying biogas enters the first three-phase separator 5, and the granular sludge separated by the first three-phase separator 5 falls back to the first anaerobic reaction zone 4, and the biogas carrying mud and water enters the gas-liquid separation tank 15 through the first biogas riser 15, while the wastewater continues to rise to the second anaerobic reaction zone 6 for further reaction. After the reaction, the mud, water and gas mixed liquid carrying biogas enters the second three-phase separator 7, and the granular sludge separated by the second three-phase separator 7 falls back to the second anaerobic reaction zone 6, and the biogas carrying mud and water enters the gas-liquid separation tank 15 through the second biogas riser 14, and the purified water continues to rise to the water outlet area 8.

[0052] The mud, water and gas mixture carrying biogas enters the gas-liquid separation tank 15 for gas-liquid separation, and the separated biogas is discharged from 17, while the mud and water fall back to the bottom of the first anaerobic reaction zone 4 through the sludge downpipe 16 to continue reacting with the wastewater.

[0053] The external circulation process of the IC reactor 1 is as follows: the purified water in the outlet area 8 enters the external circulation riser 21 through the outlet pipe 18, a part of the purified water is directly discharged into the subsequent system through the circulation riser outlet pipe 22, and the other part of the purified water enters the circulating water mixing area as circulating water, and is mixed with the wastewater to be treated sent in by the wastewater inlet main pipe 23 and then sent into the IC reactor 1 through the inlet main pipe 19, or directly enters the IC reactor 1 through the inlet main pipe 19.

[0054] After the IC reactor 1 has been running for a period of time, calcified sludge with high density and difficult to be stirred up will be collected at the bottom of the mud hopper 2. The mud flushing water inlet control butterfly valve 10 is opened, and the circulating water in the water inlet main pipe 19 is used to flush the mud hopper 2 to stir up the calcified sludge accumulated in the mud hopper 2. The mud discharge control gate valve 12 is opened to discharge the calcified sludge from the IC reactor 1 through the mud discharge pipe 11.

[0055] Preferably, the mud flushing water inlet control butterfly valve 10 and the mud discharge control gate valve 12 are opened regularly to flush the mud bucket 2 with circulating water to avoid a reduction in the treatment efficiency of the reactor.

[0056] The ideal embodiment of the utility model is an inspiration. Through the above description, relevant staff can make various changes and modifications without departing from the scope of the technical idea of ​​the utility model.

[0057] The technical scope of this utility model is not limited to the contents in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An IC reaction device for high calcium wastewater, It is characterized in that It includes: IC reactor, water inlet main pipe, water inlet branch pipe and calcified sludge treatment unit; The interior of the IC reactor is divided into a calcified sludge collection area and an anaerobic reaction area from bottom to top; The water inlet branch pipe is arranged between the calcified sludge collection area and the anaerobic reaction area, the water inlet branch pipe is connected with the water inlet main pipe, and the water inlet main pipe is used to transport the wastewater to be treated to the IC reactor; The calcified sludge collection area is provided with a mud bucket for collecting calcified sludge, and the mud bucket is provided with a mud flushing water inlet and a mud discharge outlet; The calcified sludge treatment unit comprises a sludge flushing water inlet pipe and a sludge discharge pipe, one end of the sludge flushing water inlet pipe is connected to the sludge flushing water inlet, and the other end is connected to the water inlet main pipe, so as to pass the wastewater in the water inlet main pipe into the sludge hopper to flush the calcified sludge; The mud discharge pipe is communicated with the mud discharge port to discharge the calcified sludge flushed from the mud bucket.

2. The IC reaction device according to claim 1, characterized in that: The anaerobic reaction zone includes, from bottom to top: a first anaerobic reaction zone, a second anaerobic reaction zone and a water outlet zone; A first three-phase separator is provided between the first anaerobic reaction zone and the second anaerobic reaction zone, and the first three-phase separator is used to separate the biogas, the treated wastewater and the granular sludge generated by the reaction in the first anaerobic reaction zone; A second three-phase separator is provided between the second anaerobic reaction zone and the water outlet zone, and the second three-phase separator is used to separate the biogas generated by the reaction in the second anaerobic reaction zone, the treated wastewater and the granular sludge.

3. The IC reaction device according to claim 2, characterized in that: It also includes: a gas-liquid separation tank, a first biogas ascending pipe, a second biogas ascending pipe and a sludge descending pipe, The first three-phase separator is connected to the first air inlet of the gas-liquid separation tank through the first biogas riser, and the second three-phase separator is connected to the second air inlet of the gas-liquid separation tank through the second biogas riser; The gas-liquid separation tank is used to separate the biogas carrying muddy water collected by the first three-phase separator and the second three-phase separator into gas and liquid to obtain biogas and muddy water; One end of the sludge downcomer is connected to the liquid outlet of the gas-liquid separation tank, and the other end of the sludge downcomer extends to the bottom of the first anaerobic reaction zone.

4. The IC reaction device according to claim 2 or 3, characterized in that: The IC reaction device further comprises an external circulation unit, and the external circulation unit comprises: a water outlet pipe; The water outlet area, the water outlet pipe, the water inlet main pipe and the water inlet branch pipe are connected in sequence to form the external circulation unit, and a part of the purified water discharged from the water outlet area is used as circulating water to re-enter the IC reactor through the external circulation unit for reaction.

5. The IC reaction device according to claim 4, characterized in that: The external circulation unit also includes: an external circulation riser, a circulation riser outlet pipe and a wastewater inlet main pipe. The interior of the external circulation riser is divided into a circulating water mixing area and a purified water outlet area from bottom to top. The inlet of the purified water outlet area is connected to the outlet of the outlet pipe, and the outlet of the purified water outlet area is connected to the outlet pipe of the circulation riser; The inlet of the circulating water mixing zone is connected to the wastewater inlet main pipe, and the outlet of the circulating water mixing zone is connected to the water inlet main pipe; The purified water discharged from the outlet area enters the purified water outlet area, a part of the purified water is discharged through the circulating riser outlet pipe, and the other part of the purified water falls from the purified water outlet area to the circulating water mixing area, and is mixed with the wastewater to be treated sent in by the wastewater inlet main pipe, and then sent into the IC reactor through the inlet main pipe.

6. The IC reaction device according to claim 4, characterized in that: The water inlet branch pipe is provided with a plurality of evenly distributed water outlets, and the water outlets face the calcified sludge collection area; and / or, The IC reactor is also provided with a water distributor, which is arranged on the water inlet branch pipe and is used to evenly distribute the wastewater to be treated entering the anaerobic reaction zone.

7. The IC reaction device according to claim 4, characterized in that: The water inlet main pipe is provided with a circulation pump, and the circulation pump is used to provide conveying power for the circulating water in the external circulation unit.

8. The IC reaction device according to claim 5, characterized in that: The wastewater inlet main pipe is provided with an inlet pump, and the inlet pump is used to provide conveying power for the wastewater to be treated.

9. The IC reaction device according to claim 3, characterized in that: It also includes: a biogas pipe, the two ends of which are respectively connected to the gas outlet of the gas-liquid separation tank and the subsequent biogas treatment system, and are used to send the biogas separated from the mud and water into the subsequent system for treatment.

10. The IC reaction device according to claim 1, characterized in that: The mud flushing water inlet pipe is provided with a mud flushing water inlet control butterfly valve, and the mud discharge pipe is provided with a mud discharge control gate valve.

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