CN111661985A

CN111661985A - Electrically enhanced internal circulation anaerobic reactor and method

Info

Publication number: CN111661985A
Application number: CN202010574100.0A
Authority: CN
Inventors: 姜笔存; 贺雨舟; 屈晋云; 谈政焱; 刘浩亮
Original assignee: Nanjing Innovation Centre For Environmental Protection Industry Co ltd
Current assignee: Nanjing Innovation Centre For Environmental Protection Industry Co ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2020-09-15

Abstract

The invention discloses an electrically enhanced internal circulation anaerobic reactor and a method, belonging to the field of wastewater treatment. According to the electrically enhanced IC anaerobic reactor, the electrochemical unit is arranged in the reactor body, toxic pollutants in wastewater are rapidly oxidized and degraded through the combination of the three-dimensional electrode and the iron-carbon filler, the biodegradability of the wastewater is improved, the stable operation of the reactor is ensured, and the treatment effect is improved; further, the sludge in the reactor is continuously reduced and detoxified by the reduction action of iron-carbon micro-electrolysis, and simultaneously the generated ferrous iron and ferric iron assist the anaerobic sludge to form granules, thereby achieving the purpose of activating the sludge.

Description

Electrically enhanced internal circulation anaerobic reactor and method

Technical Field

The invention belongs to the field of wastewater treatment, and particularly relates to an electrically enhanced internal circulation anaerobic reactor and a method.

Background

An Internal Circulation (IC) anaerobic reactor is a new generation of high-efficiency anaerobic reactor, wastewater flows from bottom to top in the reactor, pollutants are adsorbed and degraded by bacteria, and treated water flows out from the upper part of the reactor. The IC anaerobic reactor has higher ascending flow rate and volume load, and the required occupied area is small; and meanwhile, grading treatment is introduced, so that the impact load resistance is further enhanced.

Through retrieval, the Chinese patent application with application number 201710457798.6, application date 2017, 6 and 16 discloses an IC anaerobic reactor, which comprises a tank body, a mixing zone, a first anaerobic zone, a lower three-phase separator, a second anaerobic zone, an upper three-phase separator, a settling zone and a gas-liquid separator, wherein the gas-liquid separator is respectively connected with the lower three-phase separator and the upper three-phase separator through a lifting pipe, the mixing zone comprises a conical tank bottom, a water inlet pipe arranged on the upper side of the conical tank bottom and a return pipe arranged at the upper end of the water inlet pipe, the lower end of the return pipe is provided with a conical pipe orifice, and the upper end of the return pipe is connected with the gas-liquid separator; an annular settling tank is arranged at the periphery of the bottom of the conical tank, and a plurality of sludge discharge pipes are arranged on the side wall of the annular settling tank; a circulating pump is arranged outside the tank body, and two ends of the circulating pump are respectively connected with the return pipe and the sedimentation zone through circulating pipes; the reactor is connected with the return pipe through the circulating pipe of the external circulation, the return pipe and the tank bottom are arranged into the matched conical shapes, the uniformity of water distribution is improved, the treatment effect is improved, and the annular sludge settling tank is favorable for the full discharge of sludge.

For another example, the application No. 201810107290.8, chinese patent application No. 2018, 2.2.4 discloses an IC anaerobic reactor, which includes a reaction tank, a gas-liquid separator provided at the top of the reaction tank, a first three-phase separator and a second three-phase separator provided inside the reaction tank and located below the first three-phase separator, the first three-phase separator connected to the gas-liquid separator through a first riser, the second three-phase separator connected to the gas-liquid separator through a second riser, a first water distributor and a second water distributor provided at the bottom of the inner side of the reaction tank, the gas-liquid separator connected to the first water distributor through a first return pipe; the reactor is provided with two sets of circulating return pipelines, the return effect is good, the hydraulic load is increased, the hydrodynamic force is increased, and the sewage treatment effect is improved.

Although the sewage treatment capacity of the IC reactor is excellent, the IC reactor is easily influenced by the toxicity of the wastewater in the engineering use of high-concentration toxic industrial wastewater, the activity of sludge is inhibited, and the sludge is disintegrated, so that the performance of the whole anaerobic reactor is reduced, the wastewater treatment of enterprises cannot reach the standard stably, and the production and the environmental protection of the enterprises are seriously influenced, which becomes one of the major problems to be solved urgently in the current anaerobic reactor. Therefore, there is a need to further optimize the structure of the IC reactor, enhance the stability of the IC reactor during application, and expand its applicability.

Disclosure of Invention

1. Problems to be solved

Aiming at the problems of poor sludge activity, low COD removal rate and treatment effect to be further improved of an IC anaerobic reactor in the prior wastewater treatment technology, the invention provides an electrically enhanced internal circulation anaerobic reactor and a method. According to the electrically enhanced IC anaerobic reactor, the electrochemical unit is arranged in the reactor body, toxic pollutants in wastewater are rapidly oxidized and degraded through the combination of the three-dimensional electrode and the iron-carbon filler, the biodegradability of the wastewater is improved, the stable operation of the reactor is ensured, and the treatment effect is improved; further, the sludge in the reactor is continuously reduced and detoxified by the reduction action of iron-carbon micro-electrolysis, and simultaneously the generated ferrous iron and ferric iron assist the anaerobic sludge to form granules, thereby achieving the purpose of activating the sludge.

2. Technical scheme

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

the invention relates to an electrically enhanced internal circulation anaerobic reactor, which comprises a reactor body, wherein a water inlet pipe is arranged at the lower part of the reactor body, a water outlet pipe is arranged at the upper part of the reactor body, and a gas-liquid separator is arranged at the top of the reactor body;

the electrochemical activation detoxification region is internally provided with an electrochemical unit, the electrochemical activation detoxification region is arranged at one side, close to the water inlet pipe, in the reactor body, the first anaerobic reaction region is arranged at the top of the electrochemical activation detoxification region, the sedimentation region is arranged at one side, close to the water outlet pipe, in the reactor body, and the second anaerobic reaction region is arranged between the first anaerobic reaction region and the sedimentation region; the electrochemical unit, the first anaerobic reaction zone and the second anaerobic reaction zone are connected with the gas-liquid separator through the internal circulation unit.

Preferably, the internal circulation unit comprises a return pipe, a first ascending pipe and a second ascending pipe, one end of the return pipe is connected with the electrochemical unit, the other end of the return pipe is connected with the gas-liquid separator, the first ascending pipe is arranged in the first anaerobic reaction zone, and the first anaerobic reaction zone is connected with the gas-liquid separator through the first ascending pipe; the second ascending pipe is arranged in the second anaerobic reaction zone, and the second anaerobic reaction zone is connected with the gas-liquid separator through the second ascending pipe.

Preferably, the electrochemical unit comprises a cathode and an anode, and an iron carbon filler layer is arranged between the cathode and the anode.

Preferably, the number of electrochemical units arranged in the electrochemical activation detoxification area is 1 or Y, wherein

c is the COD concentration of the inlet water of the reactor, and the unit is mg/L;

a is the B/C ratio of the IC reactor;

b is a toxicity coefficient, when the COD of the wastewater is more than or equal to 10000, b is 1, when the COD is more than or equal to 4000 and less than 10000, b is 1.5, and when the COD is less than 4000, b is 2.

Preferably, a first-stage three-phase separator is arranged in the first anaerobic reaction zone, the first ascending pipe is arranged on the first-stage three-phase separator, and/or

And a second-stage three-phase separator is arranged in the second anaerobic reaction zone, and the second ascending pipe is arranged on the second-stage three-phase separator.

Preferably, the electrochemical unit further comprises a shell, and the cathode and the anode are arranged inside the shell, wherein the shell is a stainless steel net with the precision of 100-1000 microns.

Preferably, the cathode is any one of a graphite electrode, a stainless steel electrode and a ruthenium iridium titanium electrode, and the anode is any one of a graphite electrode, a stainless steel electrode and a ruthenium iridium titanium electrode.

Preferably, the bottom of the shell is provided with a venturi mixer.

The invention relates to a wastewater treatment method, which adopts the electrically enhanced internal circulation anaerobic reactor, wherein the number of electrochemical units arranged in the electrochemical activation detoxification region is 1 or Y, wherein

c is the COD concentration of the inlet water of the reactor, and the unit is mg/L; a is the B/C ratio of the IC reactor; b is a toxicity coefficient, when the COD of the wastewater is more than or equal to 10000, b is 1, when the COD is more than or equal to 4000 and less than 10000, b is 1.5, and when the COD is less than 4000, b is 2.

Preferably, when the number of electrochemical cells Y < 4, both the cathode and the anode are graphite electrodes and the current density is J-3 sint, where t is time in h and J is the current density at time t in mA; when the number of the electrochemical units is more than or equal to 4, the cathode is a stainless steel electrode, the anode is a ruthenium iridium titanium electrode, and the current density is J-2 sin (t-pi/6), wherein t is time and is expressed in units of h, and J is the current density at the moment of t and is expressed in units of mA.

Preferably, during treatment, an alternating current is applied to the cathode and anode; wherein, when the anode is a graphite electrode, the applied alternating current function range is-3 mA, and when the anode is a ruthenium iridium titanium electrode, the applied alternating current function range is-1 mA-3 mA.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the electrically enhanced internal circulation anaerobic reactor, countless multi-polarity particle electrodes are formed in the system through the combination of the three-dimensional electrodes and the iron-carbon filler in the electrochemical activation detoxification region, more free radicals and strong oxidation particles can be formed in the electrolytic catalysis reaction process, chain reaction can be rapidly carried out on the free radicals and the strong oxidation particles and toxic pollutants in inlet water, and oxidation degradation is carried out, so that toxic macromolecular organic matters in wastewater entering the anaerobic reactor are further subjected to ring opening and chain scission, the biodegradability of the wastewater is improved, the stable operation of an anaerobic biological system in the reactor is guaranteed, and the treatment effect is improved;

(2) according to the electrically enhanced internal circulation anaerobic reactor, not only can organic matter molecules be effectively destroyed by iron-carbon micro-electrolysis, but also the generated ferrous iron and ferric iron have good flocculation effect, so that the reduction effect can be effectively exerted, the anaerobic sludge is activated, the anaerobic sludge is assisted to form granulation, and the operation stability of an anaerobic system in high-concentration toxic wastewater is improved;

(3) the method for treating the wastewater by adopting the electrically enhanced internal circulation anaerobic reactor can select the proper number of the electrochemical units according to the toxicity of the wastewater, and further select the proper electrode material to enhance the detoxification capability of the reactor.

Drawings

FIG. 1 is a schematic structural diagram of an electrically enhanced internal circulation anaerobic reactor according to the present invention;

FIG. 2 is a schematic view of the structure of an electrochemical cell according to the present invention;

in the figure:

100. a reactor body; 110. electrochemically activating the detoxification region; 111. an electrochemical cell;

120. a first anaerobic reaction zone; 121. a first-stage three-phase separator; 130. a second anaerobic reaction zone;

131. a secondary three-phase separator; 140. a settling zone; 150. an internal circulation unit;

151. a return pipe; 152. a first riser; 153. a second riser;

200. a water inlet pipe; 300. a water outlet pipe; 400. a gas-liquid separator;

1110. a cathode; 1111. an anode; 1112. an iron-carbon filler layer; 1113. a housing; 1114. a venturi mixer.

Detailed Description

The invention is further described with reference to specific examples.

The invention relates to an electric enhanced internal circulation anaerobic reactor, which comprises a reactor body 100, wherein the lower part of the reactor body 100 is provided with a water inlet pipe 200 for feeding wastewater into the reactor body 100, the upper part of the reactor body 100 is provided with a water outlet pipe 300 for discharging the treated wastewater, and the top of the reactor body 100 is provided with a gas-liquid separator 400 for separating methane generated in the wastewater treatment process; in addition, the electrochemical activation detoxification region 110, the first anaerobic reaction region 120, the second anaerobic reaction region 130, the settling region 140 and the internal circulation unit 150 are sequentially arranged in the reactor body 100 from bottom to top; wherein, the electrochemical unit 111 is arranged in the electrochemical activation detoxification region 110, and the electrochemical unit 111, the first anaerobic reaction region 120 and the second anaerobic reaction region 130 are connected with the gas-liquid separator 400 through the internal circulation unit 150.

It should be noted that the internal circulation unit 150 includes a return pipe 151, a first rising pipe 152 and a second rising pipe 153, one end of the return pipe 151 is connected to the electrochemical unit 111, the other end of the return pipe 151 is connected to the gas-liquid separator 400, and the first rising pipe 152 is disposed in the first anaerobic reaction zone 120, and the first anaerobic reaction zone 120 is connected to the gas-liquid separator 400 through the first rising pipe 152; the second riser 153 is disposed in the second anaerobic reaction zone 130, and the second anaerobic reaction zone 130 is connected to the gas-liquid separator 400 through the second riser 153;

and a first-stage three-phase separator 121 is provided in the first anaerobic reaction zone 120, a first riser 152 is provided on the first-stage three-phase separator 121, and/or a second-stage three-phase separator 131 is provided in the second anaerobic reaction zone 130, and a second riser 153 is provided on the second-stage three-phase separator 131, by which arrangement, a part of the sludge-water mixture lifted up to the first anaerobic reaction zone 120 and the second anaerobic reaction zone 130 of the gas-liquid separator 400 by the biogas can be returned to the electrochemical unit 111 along the return pipe 151 and subjected to electrochemical treatment;

the electrochemical unit 111 comprises a cathode 1110 and an anode 1111, an iron-carbon filler layer 1112 is arranged between the cathode 1110 and the anode 1111, anaerobic sludge in the sludge-water mixture can be activated through the reduction effect of iron-carbon micro-electrolysis, and flocculation effect provided by ferrous iron and ferric iron is generated at the same time to assist anaerobic sludge in granulation. Therefore, the internal circulation unit 150 can continuously send the mud-water mixture into the electrochemical unit 111 to continuously reduce and detoxify the sludge in the reactor, so as to achieve the effects of activating the sludge and assisting the sludge granulation, and improve the operation stability of the anaerobic reactor in high-concentration toxic wastewater.

It should be further noted that, in the apparatus of the present invention, the number of the electrochemical units 111 disposed in the electrochemical activation detoxification region 110 may be 1 or Y, and the specific number may be determined according to the concentration and biodegradability (B/C ratio) of the wastewater, so as to enhance the detoxification capability of the reactor;

wherein the number of electrochemical cells 111

In addition, the electrochemical unit 111 further comprises a stainless steel mesh housing 1113 with the precision of 100-1000 microns, and a venturi mixer (1114) can be arranged at the bottom of the housing 1113, so that when wastewater enters from the water inlet pipe 200, the flow rate increases to the middle part, a negative pressure is formed at the middle part, wastewater at two sides is sucked into the water inlet pipe 200 along with a side pipe (not shown), and more muddy water can enter the electrochemical unit 111 for activation;

and the cathode 1110 and the anode 1111 are disposed inside the housing 1113, the cathode 1110 may be any one of a graphite electrode, a stainless steel electrode, and a ruthenium iridium titanium electrode, and the anode 1111 may be any one of a graphite electrode, a stainless steel electrode, and a ruthenium iridium titanium electrode, when the number Y of the electrochemical cells 111 is less than 4, the cathode 1110 and the anode 1111 are both graphite electrodes, and the current density is J3 sint, where t is time in h, and J is the current density at time t in mA; when the number of the electrochemical units 111 is greater than or equal to 4, the cathode 1110 is a stainless steel electrode, the anode 1111 is a ruthenium iridium titanium electrode, and the current density is J ═ 2sin (t-pi/6), where t is time in h, and J is the current density at time t in mA.

In order to prevent electrode polarization, alternating current is applied to the electrodes, and the graphite electrode and the ruthenium iridium titanium electrode are respectively matched with alternating current functions. When the anode 1111 is a graphite electrode, the applied alternating current function ranges from-3 mA to 3mA, and when the anode 1111 is a ruthenium-iridium-titanium electrode, the applied alternating current function ranges from-1 mA to 3 mA.

The invention relates to a wastewater treatment method, which adopts an electric enhanced internal circulation anaerobic reactor to treat wastewater, wherein the wastewater enters a reactor body 100 through a water inlet pipe 200 and upwards enters 1 or Y electrochemical units 111 of an electrochemical activation detoxification area 110 for electrochemical treatment under the action of a water distributor (not shown); in the electrochemical unit 111, countless multi-polarity particle electrodes are formed in the system through the combination of the electrodes and the iron-carbon filler, and chain reaction is rapidly carried out with toxic pollutants in the inlet water to carry out oxidative degradation; meanwhile, the iron-carbon micro-electrolysis can also effectively exert the effect of destroying organic molecules, generate more ferrous iron and ferric iron to provide flocculation effect, and effectively exert the reduction effect to destroy the molecular structure of the organic molecules.

The electrochemically treated wastewater proceeds upwardly to the first anaerobic reaction zone 120 where a strong and efficient contact with the granular sludge occurs, where most of the biodegradable organic matter is converted to biogas, and the resulting biogas is passed from the primary three-phase separator 121 and up the first riser 152 to the gas-liquid separator 400. The biogas rises and simultaneously lifts part of the sludge-water mixture in the first anaerobic reaction zone 120 to the gas-liquid separator 400, the biogas is separated from the sludge-water and is guided out of the reactor body 100, the sludge-water mixture returns to the electrochemical unit 111 along the return pipe 151, under the reduction action of iron-carbon micro-electrolysis, the anaerobic sludge is activated, and simultaneously the generated ferrous iron and ferric iron provide flocculation to assist the anaerobic sludge to form granules and fully mix with the granular sludge at the bottom and the inlet water, so as to realize internal circulation.

After the first settling, the bulk of the ascending water stream continues to flow upward into the second anaerobic reaction zone 130 for further treatment. The residual organic matters in the wastewater are further degraded by the anaerobic granular sludge in the second anaerobic reaction zone 130, and the effluent quality is improved. The mud-water mixture in the second anaerobic reaction zone 130 is subjected to solid-liquid separation in the sedimentation zone 140, the treated supernatant fluid overflows to the water outlet pipe 300 through the overflow weir and is discharged, and the precipitated granular sludge can automatically return to the second anaerobic reaction zone 130; and the generated biogas and a part of the mud-water mixture are collected by the two-stage three-phase separator 131, enter the gas-liquid separator 400 through the second riser tube 153, and then can return to the electrochemical unit 111 along the return pipe 151.

The method for treating the wastewater by adopting the electrically enhanced internal circulation anaerobic reactor can improve the biodegradability of the wastewater, ensure the stable operation of an anaerobic biological system in the reactor, and realize the functions of activating sludge and assisting the granulation of the sludge.

Example 1

The water quality COD of certain chemical wastewater after pretreatment is 1200-1400mg/L, BOD₅200-300mg/L, the B/C ratio is about 0.2.

The electrically enhanced internal circulation anaerobic reactor of the embodiment comprises a reactor body 100, wherein an electrochemical activation detoxification zone 110, a first anaerobic reaction zone 120, a second anaerobic reaction zone 130, a precipitation zone 140 and an internal circulation unit 150 are arranged in the reactor body 100. The number of the electrochemical units 111 in the electrochemical activation detoxification region 110 is 1, the housing 1113 of the electrochemical unit 111 is a stainless steel mesh (the precision is 100 micrometers), two graphite electrode plates are arranged in the electrochemical activation detoxification region, the cathode 1110 is a graphite electrode, the anode 1111 is a graphite electrode, the iron-carbon filler layer 1112 (the particle size of the filler in the iron-carbon filler layer is 4-6cm) is filled in the middle of the electrode plate, alternating current is applied, the current density is J ═ 3sint, wherein t is time, the unit is h, and J is the current density at the time t, and the unit is mA.

After the electric enhanced internal circulation anaerobic reactor is adopted for wastewater treatment in the embodiment, the COD (chemical oxygen demand) of the effluent is less than or equal to 650mg/L and BOD (biochemical oxygen demand)₅Less than or equal to 125mg/L, and compared with the prior art, the COD removal rate of the high-concentration toxic wastewater is improved by 10 to 20 percent within the same total retention time.

Example 2

The basic contents of this embodiment are the same as embodiment 1, except that: the water quality COD of certain pharmaceutical wastewater after pretreatment is 13162mg/L and BOD₅At 3412mg/L, the B/C ratio was about 0.27.

The electrically enhanced internal circulation anaerobic reactor of the embodiment comprises a reactor body 100, wherein an electrochemical activation detoxification zone 110, a first anaerobic reaction zone 120, a second anaerobic reaction zone 130, a precipitation zone 140 and an internal circulation unit 150 are arranged in the reactor body 100. The number of the electrochemical units 111 in the electrochemical activation detoxification region 110 is 7, the housing 1113 of the electrochemical unit 111 is a stainless steel mesh (the precision is 500 micrometers), the cathode 1110 is a stainless steel electrode, the anode 1111 is a ruthenium-iridium-titanium electrode, the iron-carbon filler layer 1112 (the particle size of the filler in the iron-carbon filler layer is 2-4cm) is filled in the middle of the polar plate, and alternating current is applied, wherein the current density is J ═ 2sin (t-pi/6), t is time, the unit is h, and J is the current density at the moment of t, and the unit is mA.

After the electric enhanced internal circulation anaerobic reactor is adopted for wastewater treatment, COD (chemical oxygen demand) of effluent is less than or equal to 3900mg/L and BOD (biochemical oxygen demand)₅Less than or equal to 1020mg/L, and compared with the prior art, the COD removal rate of the high-concentration toxic wastewater is improved by 30-40 percent within the same total retention time.

Example 3

The basic contents of this embodiment are the same as embodiment 1, except that: the water quality COD of a certain tannery wastewater after pretreatment is 2000mg/L and BOD₅800mg/L, and a B/C ratio of about 0.4.

The electrically enhanced internal circulation anaerobic reactor of the embodiment comprises a reactor body 100, wherein an electrochemical activation detoxification zone 110, a first anaerobic reaction zone 120, a second anaerobic reaction zone 130, a precipitation zone 140 and an internal circulation unit 150 are arranged in the reactor body 100. The number of the electrochemical units 111 in the electrochemical activation detoxification region 110 is 2, the housing 1113 of the electrochemical unit 111 is a stainless steel mesh (the precision is 1000 microns), the cathode 1110 adopts a graphite electrode, the anode 1111 adopts a graphite electrode, the middle of the polar plate is filled with an iron-carbon filler layer 1112 (wherein, the particle size of the filler in the iron-carbon filler layer is 1-4cm), and alternating current is applied, the current density is J3 sint, wherein t is time, the unit is h, and J is the current density at the moment t, and the unit is mA.

After the electric enhanced internal circulation anaerobic reactor is adopted for wastewater treatment in the embodiment, the COD (chemical oxygen demand) of the effluent is less than or equal to 200mg/L and BOD (biochemical oxygen demand)₅Less than or equal to 80mg/L, and compared with the prior art, the COD removal rate of the high-concentration toxic wastewater is improved by 20-30 percent within the same total retention time.

The present invention and its embodiments have been described above schematically, the description is not restrictive, the data used are only one of the embodiments of the present invention, and the actual data combination is not limited to this. Therefore, if the person skilled in the art receives the teaching, the embodiments and examples similar to the above technical solutions shall not be designed in an inventive manner without departing from the spirit of the present invention, and shall fall within the protection scope of the present invention.

Claims

1. The utility model provides an electricity enhancement mode inner loop anaerobic reactor, includes reactor body (100), the lower part of reactor body (100) is provided with inlet tube (200), and the upper portion of reactor body (100) is provided with outlet pipe (300) to the top of reactor body (100) is provided with vapour and liquid separator (400), its characterized in that: the reactor body (100) is internally provided with an electrochemical activation detoxification region (110), a first anaerobic reaction region (120), a second anaerobic reaction region (130), a sedimentation region (140) and an internal circulation unit (150) from bottom to top in sequence;

wherein, an electrochemical unit (111) is arranged in the electrochemical activation detoxification area (110), and the electrochemical unit (111), the first anaerobic reaction area (120) and the second anaerobic reaction area (130) are connected with a gas-liquid separator (400) through an internal circulation unit (150).

2. An electrically enhanced internal circulation anaerobic reactor according to claim 1, wherein: the internal circulation unit (150) comprises a return pipe (151), a first ascending pipe (152) and a second ascending pipe (153), one end of the return pipe (151) is connected with the electrochemical unit (111), the other end of the return pipe (151) is connected with the gas-liquid separator (400), the first ascending pipe (152) is arranged in the first anaerobic reaction zone (120), and the first anaerobic reaction zone (120) is connected with the gas-liquid separator (400) through the first ascending pipe (152); the second ascending pipe (153) is arranged in the second anaerobic reaction zone (130), and the second anaerobic reaction zone (130) is connected with the gas-liquid separator (400) through the second ascending pipe (153).

3. An electrically enhanced internal circulation anaerobic reactor according to claim 1, wherein: the electrochemical unit (111) comprises a cathode (1110) and an anode (1111), and an iron carbon filler layer (1112) is arranged between the cathode (1110) and the anode (1111).

4. An electrically enhanced internal circulation anaerobic reactor according to claim 1, wherein: the number of the electrochemical units (111) arranged in the electrochemical activation detoxification area (110) is 1 or Y, wherein

a is the B/C ratio of the IC reactor;

5. An electrically enhanced internal circulation anaerobic reactor according to claim 2, wherein:

a first-stage three-phase separator (121) is arranged in the first anaerobic reaction zone (120), a first ascending pipe (152) is arranged on the first-stage three-phase separator (121), and/or

A second-stage three-phase separator (131) is arranged in the second anaerobic reaction zone (130), and a second ascending pipe (153) is arranged on the second-stage three-phase separator (131).

6. An electrically enhanced internal circulation anaerobic reactor according to claim 3, wherein: the electrochemical unit (111) further comprises a shell (1113), the cathode (1110) and the anode (1111) are arranged inside the shell (1113), and the shell (1113) is a stainless steel net with the precision of 100-1000 microns.

7. An electrically enhanced internal circulation anaerobic reactor according to claim 3, wherein: the cathode (1110) is any one of a graphite electrode, a stainless steel electrode and a ruthenium iridium titanium electrode, and the anode (1111) is any one of a graphite electrode, a stainless steel electrode and a ruthenium iridium titanium electrode.

8. A method for treating wastewater, which is characterized in that: an electrically enhanced internal circulation anaerobic reactor according to any of claims 1-7, wherein the number of electrochemical units (111) arranged in the electrochemical activation detoxification zone (110) is 1 or Y, wherein

a is the B/C ratio of the IC reactor;

9. A method of wastewater treatment according to claim 8, characterized in that:

when the number Y of electrochemical cells (111) is less than 4, the cathode (1110) and the anode (1111) are both graphite electrodes, and the current density is J-3 sint, wherein t is time and is expressed in h, and J is the current density at the moment t and is expressed in mA;

when the number of electrochemical units (111) is more than or equal to 4, the cathode (1110) is a stainless steel electrode, the anode (1111) is a ruthenium iridium titanium electrode, and the current density is J-2 sin (t-pi/6), wherein t is time and is expressed in h, and J is the current density at the time of t and is expressed in mA.

10. A method of wastewater treatment according to claim 9, characterized in that: applying an alternating current to the cathode (1110) and anode (1111) during treatment; wherein the content of the first and second substances,

when the anode (1111) is a graphite electrode, the applied alternating current function ranges from-3 mA to 3mA,

when the anode (1111) is a ruthenium iridium titanium electrode, the applied alternating current function ranges from-1 mA to 3 mA.