A sludge anaerobic digestion simultaneous domestication wastewater treatment system and a method for operating the same

Abstract

The application discloses a wastewater treatment system for sludge anaerobic digestion synchronization domestication and a running method thereof. The system comprises a synchronization domestication unit and a main reaction unit. Organic wastewater enters the synchronization domestication unit and the main reaction unit respectively. The wastewater in the main reaction unit reacts with granular sludge. The main reaction unit also outputs the sludge after the mixed reaction to the synchronization domestication unit. After the treatment of the synchronization domestication unit, the sludge mixed solution is returned to the main reaction unit. The synchronization domestication unit comprises a reactor and a nano zero-valent iron delivery device. The reactor contains granular sludge. The nano zero-valent iron delivery device mixes and stirs the powdered nano zero-valent iron with the wastewater to obtain a sludge mixed solution. Then, the sludge mixed solution is delivered to the reactor through a pipeline. After the mixed solution enters the reactor, the mixed solution is adsorbed and combined with the granular sludge under the action of gravity. Under the extracellular secretion induction, the structure is accelerated to form, and the reinforced granular sludge and the sludge mixed solution are obtained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of biochemical treatment of organic wastewater, and particularly relates to a wastewater treatment system for simultaneous sludge anaerobic digestion domestication and a running method thereof. BACKGROUND

[0002] With the rapid rise of large-scale comprehensive industrial parks, a large amount of wastewater is generated while economic benefits are brought. Due to the different types of industries in the industrial park, the collected organic wastewater has the following characteristics: (1) frequent water quality fluctuations; (2) containing toxic and refractory substances and complex composition; which greatly challenges the process operation efficiency. Currently, the solutions to this problem usually have two directions: (1) reasonably design the pretreatment unit and combined process according to the characteristics of the incoming water to ensure the effluent effect; (2) modify the reaction unit to improve the processing redundancy.

[0003] Anaerobic biochemical treatment is the core treatment section in the current high-concentration organic wastewater treatment process, which not only has low energy consumption compared with aerobic microbial treatment, but also can produce biogas as a secondary energy source. In order to ensure the operation effect of the reactor, it is often required to stabilize the influent water quality and to replace the sludge regularly. The start-up period after each sludge supplement is long, which affects the operation efficiency and economy. In order to solve the above problems, many studies have designed the reactor and combined process, however, the actual running environment is complex and variable, and most of the schemes are not suitable for large-scale wastewater treatment process facilities due to the limitation of construction and operation and maintenance costs. Therefore, introducing external strengthening measures based on the original reactor has become an economically applicable choice.

[0004] Nanoscale zero-valent iron can be used to strengthen biological treatment due to its high reactivity as a good electron donor and conductor. The key is that because nanoscale zero-valent iron produces selective pressure on the microbial system, it can be used to direct the strengthening and enrichment of specific functional flora, thereby increasing the system redundancy and significantly improving the adaptability of the reaction system to complex fluctuating water quality. Chinese Invention Patent CN117486363B discloses a method for strengthening the anaerobic digestion of sulfonamide wastewater by nanoscale iron, which eliminates the limitation of sulfonamide antibiotics in the degradation process. The prior art also discloses a method for increasing methane production in the process of sludge anaerobic digestion by nanoscale zero-valent iron, which maintains the stability of the anaerobic digestion system, improves the anaerobic digestion efficiency, and promotes the dissolution and release of organic matter in the anaerobic digestion process. The prior art further discloses a method for improving the efficiency of sludge anaerobic digestion while reducing the ecological toxicity of heavy metals, which changes the microbial community structure by adding nanoscale zero-valent iron-loaded composite materials, thereby improving the efficiency of anaerobic digestion. In summary, nanoscale zero-valent iron can be used as an effective external strengthening measure to improve the redundancy and treatment efficiency of the anaerobic digestion system.

[0005] Further pointed out: usually different domestication methods are used to strengthen the sludge to adapt to different environmental conditions, Chinese invention patent CN116462311A discloses a method for improving the nitrification rate of activated sludge system at low temperature based on composite pollution pre-stress, and proposes a method for improving the nitrification rate of activated sludge system at low temperature under the composite pollution pre-stress of halogenated carbazole and nanomaterials. The patent proposes that the nanomaterial pre-stress can shorten the domestication time, but the operation steps are more and the time consumption is still long. This is also a problem in the prior art. Most methods often require a long domestication time and a long start-up time. In addition, directly adding nanomaterials into the reactor will produce strong irritation, and actual operation will face great risks. If the conditions are not properly controlled, it may cause uneven distribution of materials, uneven water distribution, sludge hardening / dissolution, and even reactor operation collapse in severe cases.

[0006] Therefore, the present application proposes a wastewater treatment system for sludge anaerobic digestion and simultaneous domestication and a running method thereof. A simultaneous domestication unit is arranged on the basis of the original process. Nanometer zero-valent iron and its composite materials are added in the unit to achieve the effect of directional strengthening of sludge. The domesticated sludge is simultaneously lifted into the anaerobic reactor to reduce the frequency of sludge supplement and shorten the start-up time. SUMMARY

[0007] The present application aims to provide a wastewater treatment system for sludge anaerobic digestion and simultaneous domestication and a running method thereof, which solves the problems of frequent sludge supplement, long start-up period and poor adaptability to complex fluctuating water quality in the actual operation of the present anaerobic treatment section.

[0008] Technical scheme: A wastewater treatment system for sludge anaerobic digestion and simultaneous domestication, which comprises a conditioning tank, a simultaneous domestication unit and a main reaction unit.

[0009] The simultaneous domestication unit comprises a reactor and a nanometer zero-valent iron feeding device. The reactor contains granular sludge. The nanometer zero-valent iron feeding device mixes and stirs the powdered nanometer zero-valent iron with wastewater to obtain a nanometer zero-valent iron mixture, then transports the nanometer zero-valent iron mixture to the reactor through a pipeline. After the mixture enters the reactor, it is adsorbed and combined with the granular sludge under the action of gravity, and the formation of the strengthened structure is accelerated under the induction of extracellular secretion, obtaining the strengthened granular sludge.

[0010] In the system, organic wastewater enters the simultaneous domestication unit and the main reaction unit respectively. In the main reaction unit, wastewater reacts with granular sludge to convert organic matter in the wastewater into methane and carbon dioxide, and remove total nitrogen. The main reaction unit also outputs the sludge after mixing reaction to the simultaneous domestication unit. After treatment by the simultaneous domestication unit, the sludge mixture is returned to the main reaction unit.

[0011] The main reaction unit and the reactor are both anaerobic granular sludge reactors.

[0012] Further, the reactor in the simultaneous acclimation unit is an upflow anaerobic reactor, the main reaction unit is an EGSB reactor, the upflow anaerobic reactor outputs the enhanced sludge mixed liquid to the EGSB reactor, and the EGSB reactor outputs the sludge to the upflow reactor.

[0013] The system realizes the anaerobic digestion and sludge simultaneous acclimation in the organic wastewater treatment process through the simultaneous acclimation unit.

[0014] Further, the system further comprises one or any combination of a sedimentation tank, an adjustment tank, a mixing and heating tank, a cooling tank and a contact oxidation tank.

[0015] The reactor and the main reaction unit are provided with a three-phase separator to realize the separation and discharge or collection of the sludge, water and gas.

[0016] In the system, the concentration of the nano zero-valent iron mixed liquid in the stirrer of the nano zero-valent iron delivery device is maintained at 1-5 g / L, and nitrogen is introduced before mixing to maintain the anaerobic state in the mixing tank, and the concentration of the nano zero-valent iron in the stirrer is 20-150 mg / L.

[0017] The concentration of the nano zero-valent iron in the simultaneous acclimation unit is determined according to the biodegradability of the influent, if the BOD5 / COD ratio is ≤0.3, the concentration of the nano zero-valent iron in the anaerobic reactor is increased to 120-150 mg / L, if the BOD5 / COD ratio is between 0.3 and 0.5, the concentration in the anaerobic reactor is adjusted to 60-120 mg / L, and if the BOD5 / COD ratio is ≥0.5, the concentration in the anaerobic reactor is controlled to be 20-60 mg / L.

[0018] Further, the nano zero-valent iron has a size of ≤100 nm in at least one direction.

[0019] The adjustment tank is used to adjust the pH value of the wastewater to 6.5-7.5.

[0020] Further, the granular sludge in the simultaneous acclimation unit comes from the sludge discharge of the anaerobic reactor or the externally added granular sludge; the simultaneous acclimation unit comprises discharging the old sludge in the reactor unit according to the frequency, and the externally added granular sludge is added through the sludge addition port; when the externally added granular sludge is used, the proportion in the unit does not exceed 50% of the total sludge.

[0021] The operation method of a wastewater treatment system with simultaneous sludge digestion and domestication comprises the following steps: after pretreatment, the wastewater enters a main reaction unit and a simultaneous domestication unit, the pretreatment comprises wastewater pH value adjustment, mixing and temperature control; in the main reaction unit, the wastewater is in contact with the granular sludge for reaction, and the frequency of discharging the granular sludge into the reactor of the simultaneous domestication unit is controlled; the nano zero-valent iron material is stirred and dispersed in the stirrer of a nano zero-valent iron delivery device, and continuously input into the reactor to complete the simultaneous domestication operation; the nano zero-valent iron is in contact with the granular sludge in the simultaneous domestication unit for strengthening, and the strengthened granular sludge mixture is lifted to the anaerobic reactor unit.

[0022] Further, the sludge discharge frequency or amount of the main reaction unit in the system is determined according to the volume load, the main reaction unit comprises the sludge intercommunication with the simultaneous domestication unit to adjust the treatment capacity and efficiency of the system, and the sludge in the main reaction unit is controlled to enter the simultaneous domestication unit for strengthening or the simultaneous domestication unit is controlled to supply to the main reaction unit according to the treatment effect of the organic wastewater.

[0023] Beneficial effects: The significant effect of the present application is that by designing the simultaneous domestication unit, the nano zero-valent iron and its composite material are used to strengthen the granular sludge, the operation stability of the anaerobic unit is improved, the sludge supplement frequency is reduced, and the equipment investment and operation management complexity are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structure schematic diagram of the simultaneous domestication unit;

[0025] Figure 2 is a structure schematic diagram of the combination use of the simultaneous domestication unit and the anaerobic reactor;

[0026] Figure 3 is a structure schematic diagram of the biochemical treatment system of the organic wastewater;

[0027] Figure 4 is a system structure diagram in the comparative example 1;

[0028] Figure 5 is a system structure diagram in the comparative example 2. DETAILED DESCRIPTION

[0029] In order to make the disclosed technical solutions of the present application more clear and better understand the effects brought by the implementation of the present application, the present application is further described below in combination with specific diagrams.

[0030] The wastewater treatment system with simultaneous sludge digestion and domestication provided by the present application is designed with a simultaneous domestication unit, the structure of the unit can be seen from Figure 1 .

[0031] The simultaneous acclimatization unit includes reactor 1, which can preferably be an upflow anaerobic reactor or an EGSB reactor. The main reaction unit mentioned later can also be an anaerobic reactor or an EGSB reactor. It also includes a nano-iron dosing device 6. Reactor 1 contains granular sludge and is equipped with a sludge inlet 10. The granular sludge can come from the sludge discharged from the main reaction unit in the system, or it can be externally added granular sludge. The influent comes from the system influent 2. That is, the wastewater enters reactor 1 and the main reaction unit respectively. The bottom of reactor 1 is connected to a wastewater inlet pipe 2 and a sludge discharge pipe 3. The upper end of reactor 1 is provided with a feeding port 7 for the input of powdered nano-zero valent iron. Through the feeding port 7, a nano-iron dosing device 6 is connected. The nano-iron dosing device 6 includes a stirrer 8. Under the full stirring and dispersion effect of the stirrer 8, a high-concentration mixed liquid is obtained. Under the action of the circulating pump, the mixed liquid is input into the synchronous acclimation unit through the connecting pipe 9 at a certain flow rate. Under the action of gravity, it is distributed to the sludge bed and adsorbed and combined with the granular sludge. Under the induction of extracellular secretion, it accelerates the formation of large-size granular sludge with enhanced structure and performance. Finally, it is discharged from the bottom sludge discharge area through the sludge discharge pipe 3 and lifted into the main reaction unit of the system. The overflow water is discharged through the pipe 4, and the generated gas is discharged through the pipe 5. A three-phase separator is installed here to achieve separation.

[0032] Figure 2 In this embodiment, an anaerobic reactor (EGSB reactor) is used as the main reaction unit in the system. The synchronous acclimation unit has the structure described above, and it also includes the anaerobic reactor. The two can work together to improve the acclimation process and wastewater treatment. Wastewater enters both the synchronous acclimation unit and the main reaction unit. In the anaerobic reactor, the wastewater reacts with the granular sludge, converting organic matter in the wastewater into methane and carbon dioxide, while total nitrogen is also removed. During this process, the granular sludge is discharged at a certain frequency and transported to the synchronous acclimation unit. The nano-zero-valent iron dosing device is connected to the synchronous acclimation unit. After uniform dispersion in the device, a high-concentration nano-zero-valent iron mixture is continuously input into the synchronous acclimation unit and contacts the granular sludge. The enhanced granular sludge is then pumped to the anaerobic reactor in the form of a mixed liquid by a circulating pump. Operational tests show that the mixed liquid in the reactor of the synchronous acclimation unit presents three layers: an upper three-phase separation zone, a lower sludge bed reaction zone, and a bottom water distribution and sludge discharge zone.

[0033] This combination can effectively treat high-concentration, recalcitrant wastewater, increase the redundancy of the anaerobic process, better adapt to complex and fluctuating water quality, and reduce the complexity of equipment investment and operation management, achieving stable treatment results in a short time.

[0034] Based on the above system architecture, the following section will introduce the operational aspects in conjunction with the system's applications and usage.

[0035] The operation method of a sludge anaerobic digestion simultaneous domestication wastewater treatment system mainly includes the following steps:

[0036] (1) The pretreated wastewater enters the main reaction unit and the simultaneous domestication unit;

[0037] (2) In the main reaction unit, the wastewater is in contact with the granular sludge for reaction;

[0038] (3) The granular sludge is discharged according to a certain frequency and is input into the simultaneous domestication unit;

[0039] (4) The nano zero-valent iron material is stirred and dispersed in the feeding device and is continuously input into the simultaneous domestication unit;

[0040] (5) The nano zero-valent iron in the simultaneous domestication unit is in contact with the granular sludge for strengthening;

[0041] (6) The strengthened granular sludge mixture is lifted to the anaerobic reactor unit;

[0042] (7) The steps (5) and (6) are coordinated and controlled according to the efficiency and effect of the system (anaerobic reactor) for the biochemical treatment of organic wastewater, so as to realize efficient and high-quality wastewater treatment.

[0043] Preferably, the volume load of the main reaction unit is assumed to be in the range of 15-30 kgCOD / (m3·d), and the upward flow rate of the wastewater in the anaerobic reactor is controlled to be between 4-7 m / h. The sludge discharge frequency of the main reaction unit in the system is determined according to the volume load, and the single sludge discharge amount does not exceed 10% of the total amount of sludge. The main reaction unit adjusts the processing capacity and efficiency of the system by adjusting the sludge frequency with the simultaneous domestication unit. When the volume load is >18 kgCOD / (m3·d), the adjustment frequency is adjusted to 1-4 times / week; when the volume load is ≤18 kgCOD / (m3·d), the adjustment frequency is increased to 4-10 times / week to improve the processing capacity of the main reaction unit. In this scenario, the following adjustment can also be made: considering that the simultaneous domestication unit is provided with a sludge feeding port, the present application not only controls the feeding into the simultaneous domestication unit through the anaerobic reactor (in the main reaction unit), but also directly adds new granular sludge from the outside, and the proportion of the sludge in the simultaneous domestication unit does not exceed 50% of the total amount of sludge. Similarly, the simultaneous domestication unit is provided with a sludge discharge pipe, and the old sludge in the anaerobic reactor unit can be discharged according to a certain frequency.

[0044] Further pointed out: according to the water quality characteristics, modified nano zero-valent iron in powder state such as sulfidized nano zero-valent iron, EPS coated nano zero-valent iron can be selected, and the size of nano zero-valent iron in at least one dimension is ≤100nm, considering the biochemical reaction principle and the influence of treatment effect of nano zero-valent iron in organic wastewater treatment, the cost is considered, the cost of existing nano zero-valent iron with all particle size ≤100nm is very high, the invention can also select ball-milled nano iron flake to ensure that the diameter in any one direction is ≤100nm, and the concentration of nano zero-valent iron in the unit is maintained at 20-150mg / L, so that better effect can be achieved.

[0045] The concentration of nano zero-valent iron in the anaerobic reactor unit is determined according to the biodegradability of the influent, if the BOD5 / COD ratio is ≤0.3, the concentration of nano zero-valent iron in the anaerobic reactor is increased to 120-150mg / L, if the BOD5 / COD ratio is between 0.3-0.5, the concentration in the anaerobic reactor is adjusted to 60-120mg / L, and if the BOD5 / COD ratio is ≥0.5, the concentration in the anaerobic reactor is controlled at 20-60mg / L.

[0046] Example 1: Figure 3 The structure of the system described in the present application is given, after test, the wastewater combined process is continuously operated for 104 days, the influent comes from the effluent of a primary sedimentation tank in an industrial park in Jiangsu, the design scale is 100m 3 / d, sulfidized nano zero-valent iron is used as the material for use, and the material concentration in the simultaneous acclimation unit is controlled at 20mg / L. The specific effluent quality of the combined process during the pilot test is shown in Table 1, and the CODCr removal rate is maintained at about 82%. It is found that the effluent of the simultaneous acclimation unit and the EGSB reactor is good, and there is no mud running phenomenon, and the effluent is clear.

[0047] Example 2: Since the combined process in Example 1 has been started to operate, but the cost of sulfidized nano zero-valent iron is high, and the supply is unstable. In this embodiment, ball-milled nano zero-valent iron prepared on a large scale is selected as the material for use, and the measurement of single dimension ≤100nm meets the use requirements, and the combined process in Example 2 is started to operate. The material concentration in the simultaneous acclimation unit is controlled at 50mg / L. The specific effluent quality of the combined process during the pilot test is shown in Table 1, and the CODCr removal rate is maintained at about 84%. It is found that the effluent of the simultaneous acclimation unit and the EGSB reactor is good, and there is no mud running phenomenon, and the effluent is clear.

[0048] Example 3: This example used the combined process in Example 1 and ran for 126 days, using EPS-coated nano zero-valent iron obtained after EPS coating of ball-milled nano zero-valent iron as the material for use, and the material concentration in the simultaneous acclimation unit was controlled at 60 mg / L. The specific effluent quality of the combined process during the pilot test is shown in Table 1, and the CODCr removal rate was maintained at about 91%. Observation of the system found that the effluent from the simultaneous acclimation unit and the EGSB reactor was in good condition, and there was no mud running phenomenon, and the effluent was relatively clear.

[0049] Comparative Example 1: In combination with Figure 4 , this comparative example used the combined process in Example 1, the difference being that no simultaneous acclimation unit was connected, and no nano zero-valent iron was added, as shown in Figure 3 , the combined process was run alone for 104 days, and the specific effluent quality is shown in Table 1, and the CODCr removal rate was maintained at about 71%. Observation of the system found that the effluent from the EGSB reactor was basically in good condition, and there was occasionally a mud running phenomenon.

[0050] Comparative Example 2: In combination with Figure 5 , this comparative example used the combined process in Example 1, which was basically the same as Example 2, the difference being that no simultaneous acclimation unit was connected, and the ball-milled nano zero-valent iron use device was connected to the EGSB reactor, i.e. the ball-milled nano zero-valent iron was directly input into the anaerobic reactor unit, and the material concentration in the simultaneous acclimation unit was controlled at 50 mg / L. The combined process was run alone for 105 days, and the specific effluent quality is shown in Table 1, and the CODCr removal rate was maintained at about 75%. Observation of the system found that the effluent from the EGSB reactor was basically in good condition, and the effect was reduced compared with Example 2, and after the end of the operation, it was found that there was a blockage and siltation phenomenon inside, and there were many reaction dead zones, which indicated that the mixing mass transfer effect of the reactor on the nano zero-valent iron was not good.

[0051] Table 1 is the measured effluent quality during the operation in the examples and comparative examples

[0052]

[0053] The prior art discloses an embedded iron-carbon sludge storage module SBR device and a running method for promoting the formation and stability of granular sludge, which can embed different types of sludge storage modules in the main reaction unit according to requirements, and can also strengthen the microbial community in the reactor and supplement the sludge in the reactor by using nano zero-valent iron from the concept, and the structure is simple and can be flexibly adjusted. However, the nano zero-valent iron has been combined with the sludge storage module, but it still belongs to the use of a large amount of materials in the anaerobic reactor, and if a low-dose continuous input is required, the module needs to be replaced frequently, and the operation cost is high. Secondly, the preparation of the sludge storage module also needs a separate main reaction unit, and needs to design water inlet, pretreatment, subsequent treatment and other steps. If simulated wastewater is selected for domestication, it may not be suitable for real wastewater, resulting in unsatisfactory treatment effect. Therefore, connecting the simultaneous domestication device to the original process can greatly shorten the domestication adaptation and start-up reaction time, and save investment.

[0054] The system and implementation of the application have the following remarkable effects:

[0055] (1) The simultaneous domestication unit is arranged at the front end of the anaerobic digestion reactor, the process modification difficulty is low, the investment cost can be reduced, and the domesticated sludge can be continuously input into the reactor as the reactor sludge supplement source to reduce the sludge supplement frequency.

[0056] (2) The nano zero-valent iron is added in the simultaneous domestication unit, the distribution of the material in the unit is more uniform than that in the anaerobic reactor, the material can interact with the microorganisms more fully, and the directional strengthening of the sludge microbial community can be quickly realized.

[0057] (3) The material is directly added in the anaerobic digestion reactor, which prevents potential negative effects and affects the normal operation of the whole system. In the short term, the high-dose material directly entering the system has too strong stimulation effect, which can cause acute inhibition of the microbial community, and in the long term, the addition of nano materials can cause changes in sludge structure stability and activity, causing irreversible consequences. Therefore, the addition link is prepositioned to provide space for flexible adjustment.

[0058] (4) The surface activity of the nano zero-valent iron material obtained by the simultaneous domestication unit has been significantly reduced, and the outer layer is wrapped with natural extracellular polymeric substance, so that the biocompatibility with the microbial system has been significantly improved after entering the anaerobic reactor, thereby further improving the interaction effect with the microbial community.

[0059] (5) Different nano zero-valent iron and its composite materials are added according to different types of incoming water to induce differential evolution of the microbial community, realize flexible regulation effect, and the control is simple and easy to operate.

Claims

1. A wastewater treatment system for simultaneous sludge anaerobic digestion acclimation, the system comprising a conditioning tank, characterized in that, The system also comprises a simultaneous acclimation unit and a main reaction unit; The simultaneous acclimation unit comprises a reactor and a nano zero-valent iron delivery device, the reactor contains granular sludge, the nano zero-valent iron delivery device mixes and stirs the nano zero-valent iron powder with the wastewater to obtain a nano zero-valent iron mixture, and then the nano zero-valent iron mixture is transported to the reactor through a pipeline, after the mixture enters the reactor, it is adsorbed and combined with the granular sludge under the action of gravity, and the formation of the strengthened structure is accelerated under the induction of extracellular secretion to obtain the strengthened granular sludge; In the system, the organic wastewater enters the simultaneous acclimation unit and the main reaction unit respectively, the wastewater in the main reaction unit reacts with the granular sludge to convert the organic matter in the wastewater into methane and carbon dioxide, and remove total nitrogen at the same time, the main reaction unit also outputs the sludge after mixing reaction to the simultaneous acclimation unit, and then returns the sludge mixture to the main reaction unit after the treatment of the simultaneous acclimation unit; The main reaction unit and the reactor both comprise an anaerobic granular sludge reactor; In the system, the concentration of the nano zero-valent iron mixture in the stirrer of the nano zero-valent iron delivery device is maintained at 1-5 g / L, and nitrogen is introduced before mixing to maintain the anaerobic state in the mixing tank, the concentration of the nano zero-valent iron in the simultaneous acclimation unit is determined according to the biodegradability of the influent, if the BOD5 / COD ratio is ≤0.3, the concentration of the nano zero-valent iron in the reactor is increased to 120-150 mg / L, if the BOD5 / COD ratio is between 0.3 and 0.5, the concentration in the reactor is adjusted to 60-120 mg / L, and if the BOD5 / COD ratio is ≥0.5, the concentration in the reactor is controlled to be 20-60 mg / L.

2. The wastewater treatment system for simultaneous sludge anaerobic digestion domestication according to claim 1, characterized in that, The reactor in the simultaneous acclimation unit comprises an upflow anaerobic reactor, and the main reaction unit is an EGSB reactor, the upflow anaerobic reactor outputs the sludge mixture after strengthening to the EGSB reactor, and the EGSB reactor outputs the sludge to the upflow reactor; The system realizes anaerobic digestion and sludge simultaneous acclimation in the organic wastewater treatment process through the simultaneous acclimation unit.

3. The wastewater treatment system for simultaneous sludge anaerobic digestion domestication according to claim 1, characterized in that, The system also comprises one or any combination of a sedimentation tank, a conditioning tank, a mixing and heating tank, a cooling tank, and a contact oxidation tank.

4. The wastewater treatment system for simultaneous sludge anaerobic digestion domestication according to claim 1, characterized in that, The reactor and the main reaction unit are provided with a three-phase separator to realize the separation and discharge or collection of sludge, water and gas.

5. The wastewater treatment system for simultaneous sludge anaerobic digestion domestication according to claim 1, characterized in that, The nano zero-valent iron has a size of ≤100 nm in at least one direction.

6. The wastewater treatment system for sludge anaerobic digestion and simultaneous acclimation according to claim 1, wherein the conditioning tank is used to adjust the pH value of the wastewater to 6.5-7.

5.

7. The wastewater treatment system for simultaneous sludge anaerobic digestion domestication according to claim 1, characterized in that, The granular sludge in the simultaneous acclimation unit comes from the sludge discharge of the main reaction unit or externally added granular sludge, and when the externally added granular sludge is used, the proportion of the externally added granular sludge in the unit does not exceed 50% of the total sludge amount; The simultaneous acclimation unit comprises discharging the old sludge in the reactor unit at a fixed frequency or period, and supplementing the sludge by using externally added granular sludge through a sludge feeding port, and the frequency or period is determined according to the treatment effect of the organic wastewater.

8. A method for operating a sludge anaerobic digestion simultaneous acclimation wastewater treatment system according to any one of claims 1-7, characterized in that, The method comprises the following steps: pretreated wastewater enters a main reaction unit and a simultaneous domestication unit, the pretreatment comprises wastewater pH value adjustment, mixing and temperature control; in the main reaction unit, the wastewater is in contact with the granular sludge for reaction, and the frequency of discharging the granular sludge from the reactor into the simultaneous domestication unit is controlled; The nano zero-valent iron material is stirred and dispersed in the stirrer of a nano zero-valent iron delivery device, and continuously input into the reactor to complete the simultaneous domestication operation; the nano zero-valent iron is in contact with the granular sludge in the simultaneous domestication unit for strengthening, and the strengthened granular sludge mixed solution is lifted to the main reaction unit.

9. The method of operating a wastewater treatment system for simultaneous sludge anaerobic digestion domestication according to claim 8, characterized in that, The sludge discharge frequency or sludge discharge amount of the main reaction unit in the system is determined according to the volumetric load, the main reaction unit comprises the sludge intercommunication with the simultaneous domestication unit to adjust the treatment capacity and efficiency of the system, the sludge in the main reaction unit is controlled to enter the simultaneous domestication unit for strengthening or the simultaneous domestication unit is controlled to supply to the main reaction unit according to the treatment effect of the organic wastewater.

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