Organic wastewater treatment method

Abstract

The invention relates to an organic wastewater treatment method. The method comprises the following steps: pretreating organic wastewater to form pretreated wastewater; introducing the pretreated wastewater and the refluxed sludge into a biological adsorption concentration tank for biological adsorption to form adsorbed muddy water and supernate; introducing the supernate into a membrane concentration unit for membrane concentration treatment to generate a concentrated solution and clear water; pumping the adsorbed muddy water and the concentrated solution into a circulating flow anaerobic granular sludge bioreactor by using a lifting pump, carrying out anaerobic biological treatment to form sludge and effluent, separating the sludge from the effluent through a sludge screening unit, and introducing the separated effluent into a membrane concentration unit; and the AAO-MBR biochemical treatment system is used for carrying out biochemical treatment on clear water generated by the membrane concentration unit to generate sludge and discharge water. The device has the beneficial effects that the concentrated water part of the high-concentration organic matter wastewater and the clear water part of the low-concentration organic matter wastewater are subjected to split-flow treatment, so that the construction investment, the operation cost and the occupied area are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a method for treating organic wastewater. Background Art

[0002] With the rapid development of the economy, the production of industries is becoming more and more intensive and the scale is getting larger. Organic industrial wastewater treatment is an indispensable part of industrial wastewater treatment. With the vigorous development of the organic industry and the growing consumer demand, the problem of organic wastewater treatment has become increasingly prominent. Organic wastewater has the characteristics of high suspended matter content, high oil content, good biodegradability, easy corruption, and high organic matter content. These characteristics determine that the treatment of organic production wastewater requires the use of efficient, stable, and adaptable treatment processes and technologies. Therefore, it is particularly important to optimize the organic wastewater treatment process.

[0003] At present, the treatment methods for medium-concentration organic wastewater with COD concentration that is neither too high nor too low after preliminary treatment (such as oil separation, SS removal, etc.) mainly have the following problems:

[0004] If anaerobic biological method is directly used as the subsequent treatment process, although it can theoretically treat wastewater with high organic load, it is difficult to effectively cultivate granular sludge due to the low COD concentration of the influent, thereby reducing the volume load of the circulating flow anaerobic granular sludge bioreactor. In addition, the retention time setting of the anaerobic reactor also needs to consider the hydraulic load and reaction temperature at the same time, which may lead to a waste of anaerobic reactor volume and also increase investment and operating costs.

[0005] If AAO, AO, SBR, MBR and other processes are used, when treating such organic wastewater with high organic load and low COD concentration, these processes need to significantly extend the retention time to ensure the treatment effect, which not only increases the construction investment cost and operating expenses, but also occupies a large amount of land resources. Summary of the invention

[0006] The purpose of the present invention is to overcome the above problems existing in the prior art and provide a method for treating organic wastewater.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0008] A method for treating organic wastewater comprises the following steps:

[0009] S1. Pre-treating the organic wastewater to remove waste oil and waste residue to form pre-treated wastewater;

[0010] S2, the pre-treated wastewater and the endogenous respiration period sludge of the back-end biochemical return are passed into the biosorption concentration tank for biosorption, the returned sludge adsorbs the suspended matter, grease, and some soluble organic matter in the pre-treated wastewater that are not completely removed to form adsorbed muddy water with high concentration of organic matter, and some soluble organic matter, suspended matter and grease in the pre-treated wastewater are adsorbed and removed to form a supernatant;

[0011] S3, passing the supernatant into a membrane concentration unit for membrane concentration treatment to produce a concentrated solution and clear water;

[0012] S4, using a lift pump to pump the adsorbed sludge water and concentrated liquid to a circulating flow anaerobic granular sludge bioreactor for anaerobic biological treatment, the sludge produced in the circulating flow anaerobic granular sludge bioreactor is discharged into a sludge storage tank for collection and storage, the effluent of the circulating flow anaerobic granular sludge bioreactor is separated by a sludge screening unit and then introduced into a membrane concentration unit, and the sludge separated by the sludge screening unit is discharged into a sludge storage tank for collection and storage;

[0013] S5, using the AAO-MBR biochemical treatment system to perform deep biochemical treatment on the clean water generated by the membrane concentration unit to produce sludge and discharge water, a part of the sludge generated by the AAO-MBR biochemical treatment system is returned to the biological adsorption concentration tank, and the remaining sludge generated by the AAO-MBR biochemical treatment system is discharged into the sludge storage tank for collection and storage;

[0014] S6. Disinfect and meter the effluent generated by the AAO-MBR biochemical treatment system before discharging it.

[0015] Among them, a quick separation mechanism for quickly separating the adsorbed mud and water from the supernatant is installed in the biological adsorption concentration tank. The quick separation mechanism includes a sludge hopper and a water collecting trough. The water collecting trough is located at the upper part of the sludge hopper. The lower part of the sludge hopper is provided with multiple mud guide plates with a slope of 60°. The top of the mud guide plate is provided with a number of evenly distributed water holes. A slag retaining plate is fixed to each of the two long sides of the water collecting trough.

[0016] Among them, a sludge return pipe and a pretreated wastewater input pipe are installed on one side of the biological adsorption concentrator, and an electromagnetic flow valve for monitoring the sludge return speed and a flow regulating valve for adjusting the sludge return speed are installed on the sludge return pipe. The biological adsorption concentrator is also installed with a first submersible flow agitator for promoting the full mixing of the returned sludge and the pretreated wastewater.

[0017] Among them, the membrane concentration unit includes a membrane concentration tank and an ultrafiltration membrane group. The ultrafiltration membrane group is installed in the membrane concentration tank. A clean water outlet is arranged on the ultrafiltration membrane group. A concentrated liquid outlet is arranged at one end of the membrane concentration tank. A second submersible flow-pushing agitator for making the sludge deposit toward the concentrated liquid outlet is also installed in the membrane concentration tank. The second submersible flow-pushing agitator can stir and mix the water to homogenize the water quality and shake the ultrafiltration membrane to prevent concentration polarization from occurring in the ultrafiltration membrane.

[0018] Among them, an online thermometer is installed at the water inlet end of the lifting pump, and a heat exchanger for heating the adsorbed mud water and concentrated liquid is installed at the water outlet end of the lifting pump.

[0019] The heat exchanger is heated by biogas generated by a circulating flow anaerobic granular sludge bioreactor, or by waste oil collected by pretreatment, or by auxiliary heating with fuel oil or gas.

[0020] Among them, the sludge screening unit includes a cyclone separator, an inlet guide pipe, an outlet diverter pipe, and a sludge discharge pipe. The water inlet of the cyclone separator is connected to the water outlet of the circulating flow anaerobic granular sludge bioreactor through the inlet guide pipe, the drain outlet of the cyclone separator is connected to the membrane concentration unit through the outlet diverter pipe, and the sludge discharge outlet of the cyclone separator is connected to the sludge storage tank through the sludge discharge pipe.

[0021] Wherein, the circulating flow anaerobic granular sludge bioreactor is an internal circulation anaerobic reactor.

[0022] Among them, a confluence buffer tank is installed at the inlet of the lifting pump, and the confluence buffer tank is connected with the adsorption mud water discharge port of the biological adsorption concentration tank and the concentrated liquid outlet of the membrane concentration unit through a confluence pipe respectively. An alkalinity online monitor and a first PH online monitor are installed in the confluence buffer tank, and a second PH online monitor is installed in the circulating flow anaerobic granular sludge bioreactor. A PLC controller, an injection pump for injecting carbonate buffer into the confluence buffer tank, and a reagent barrel filled with carbonate buffer are installed on the confluence buffer tank. The signal receiving end of the PLC controller is connected to the online monitor, the first PH online monitor, and the second PH online monitor through cables respectively, and the signal output end of the PLC controller is connected to the injection pump through a cable. The liquid inlet of the injection pump is installed with a liquid collection tube inserted into the reagent barrel, and the liquid outlet of the injection pump is installed with an injection tube inserted into the confluence buffer tank.

[0023] Wherein, when the influent concentration of the circulating flow anaerobic granular sludge bioreactor is lower than a threshold value, the sludge stored in the sludge storage tank is added to the circulating flow anaerobic granular sludge bioreactor for anaerobic biological treatment.

[0024] The beneficial effects of the present invention are as follows: pretreated wastewater is subjected to secondary concentration and separation through a biological adsorption tank and a membrane concentration unit, the formed adsorbed muddy water and concentrated liquid are pumped to a circulating flow anaerobic granular sludge bioreactor by a lifting pump for anaerobic biological treatment, the formed clean water is subjected to conventional biochemical treatment by an AAO-MBR biochemical treatment system, and the concentrated water part of high-concentration organic wastewater and the clean water part of low-concentration organic wastewater are separated for treatment, which can solve the problems of large hydraulic load of the circulating flow anaerobic granular sludge bioreactor, large selection of anaerobic reactor, low organic load and insufficient volume utilization, and at the same time solve the problems of long residence time and high operating energy consumption of subsequent conventional biochemical treatment, thereby reducing construction investment, operating costs and floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a process flow chart of the organic wastewater treatment method of the present invention;

[0027] Figure 2 It is a partial structural schematic diagram of the biological adsorption concentration tank and the membrane concentration unit in the present invention;

[0028] Explanation of the numbers in the figure: biological adsorption concentration tank 1, sludge return pipe 11, electromagnetic flow valve 111, flow regulating valve 112, pre-treated wastewater input pipe 12, first submersible flow mixer 2, sludge hopper 3, mud guide plate 31, water hole 311, water collecting trough 4, slag retaining plate 41, membrane concentration unit 5, membrane concentration tank 51, concentrate outlet 511, ultrafiltration membrane group 52, clean water outlet 521, second submersible flow mixer 53. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0030] like Figure 1 and Figure 2 As shown, a method for treating organic wastewater comprises the following steps:

[0031] S1. Pre-treating the organic wastewater to remove waste oil and waste residue to form pre-treated wastewater;

[0032] S2, the pre-treated wastewater and the endogenous respiration period sludge of the back-end biochemical return are passed into the biosorption concentration tank for biosorption, the returned sludge adsorbs the suspended matter, grease, and some soluble organic matter in the pre-treated wastewater that are not completely removed to form adsorbed muddy water with high concentration of organic matter, and some soluble organic matter, suspended matter and grease in the pre-treated wastewater are adsorbed and removed to form a supernatant;

[0033] S3, passing the supernatant into a membrane concentration unit for membrane concentration treatment to produce a concentrated solution and clear water;

[0034] S4, using a lifting pump to pump the adsorbed mud water and concentrated liquid to a circulating flow anaerobic granular sludge bioreactor for anaerobic biological treatment, the sludge produced in the circulating flow anaerobic granular sludge bioreactor is discharged into a sludge storage tank for collection and storage, the effluent of the circulating flow anaerobic granular sludge bioreactor is separated by a sludge screening unit and then introduced into a membrane concentration unit, and the sludge separated by the sludge screening unit is discharged into a sludge storage tank for collection and storage;

[0035] S5. Use the AAO-MBR biochemical treatment system to perform deep biochemical treatment on the clean water produced by the membrane concentration unit to produce sludge and discharge water. A portion of the sludge produced by the AAO-MBR biochemical treatment system is returned to the biological adsorption concentration tank, and the remaining sludge produced by the AAO-MBR biochemical treatment system is discharged into the sludge storage tank for collection and storage;

[0036] S6. The effluent generated by the AAO-MBR biochemical treatment system is disinfected and measured before being discharged.

[0037] A sludge return pipe 11 and a pretreated wastewater input pipe 12 are installed on one side of the biological adsorption concentration tank 1. An electromagnetic flow valve 111 for monitoring the sludge return speed and a flow regulating valve 112 for adjusting the sludge return speed are installed on the sludge return pipe 11. The biological adsorption concentration tank 1 is also equipped with a first submersible flow mixer 2 for promoting the full mixing of the returned sludge and the pretreated wastewater.

[0038] In order to improve the separation speed of the sludge adsorbed with suspended solids and grease in the biological adsorption concentration tank 1, a rapid separation mechanism for rapidly separating the adsorbed sludge water from the supernatant is installed in the biological adsorption concentration tank 1. The rapid separation mechanism has low requirements for the effluent SS and is selected to adopt 3-4.5m 3 / m2 / h high hydraulic load, adopting 0.5-1h low hydraulic retention time, reducing equipment size, and playing the role of quickly separating most of the sludge with high concentration of organic matter adsorbed.

[0039] The rapid separation mechanism includes a sludge hopper 3 and a water collection tank 4. The water collection tank 4 is located at the upper part of the sludge hopper 3. The single-side water collection radiation range of the water collection tank 4 does not exceed 1m to avoid excessive local water flow rising too fast and excessive mud turning; the flow rate in the tank is not less than 0.6m / s, and the slope is 1% to prevent sludge sedimentation.

[0040] The lower part of the sludge hopper 3 is provided with a plurality of mud guide plates 31 with a slope of 60°, which can shorten the sludge settling time and facilitate the sludge to quickly gather at the bottom of the sludge hopper 3; the top of the mud guide plate 31 is provided with a plurality of evenly distributed water holes 311, so that the upper part of the sludge hopper 3 forms a small resistance porous water distribution system, and the flow rate of the water holes is less than 0.1m / s.

[0041] In order to reduce the influence of the disturbance of the rising water flow on the collection of the supernatant, a slag blocking plate 41 is fixedly connected to the two long sides of the water collecting tank 4 respectively.

[0042] The membrane concentration unit 5 comprises a membrane concentration tank 51 and an ultrafiltration membrane group 52. The ultrafiltration membrane group 52 is installed in the membrane concentration tank 51. A clean water outlet 521 is provided on the ultrafiltration membrane group 52. A concentrated liquid outlet 511 is provided at one end of the membrane concentration tank 51. The ultrafiltration membrane group 52 is equipped with a backwash system.

[0043] The membrane concentration tank 51 is also equipped with a second submersible flow agitator 53 for depositing the sludge toward the concentrate outlet, and then the sludge flows out from the concentrate outlet along with the concentrate; and the operation of the second submersible flow agitator promotes water flow disturbance, prevents sludge from being deposited on the ultrafiltration membrane group, and reduces the risk of blockage of the ultrafiltration membrane group and the frequency of backwashing.

[0044] In order to further reduce the risk of clogging of the ultrafiltration membrane group, a vibrator for shaking the ultrafiltration module is also installed on the ultrafiltration membrane group.

[0045] According to the morphology, molecular weight and distribution of organic components in organic wastewater, as well as the effluent COD value that needs to be controlled, the molecular weight of soluble organic matter that needs to be intercepted by the membrane concentration unit is determined, so as to select an ultrafiltration membrane group with a suitable membrane pore size.

[0046] The amount of clean water produced by the membrane concentration unit is the design scale plus the amount of sludge returned from the AAO-MBR biochemical treatment system.

[0047] An online thermometer is installed at the water inlet end of the lifting pump, and a heat exchanger for heating the adsorbed mud water and concentrated liquid is installed at the water outlet end of the lifting pump. The adsorbed mud water and concentrated liquid are heated by the heat exchanger to a temperature suitable for anaerobic reaction in the circulating flow anaerobic granular sludge bioreactor, which is beneficial for the adsorbed mud water and concentrated liquid to carry out anaerobic reaction in the circulating flow anaerobic granular sludge bioreactor.

[0048] The heat exchanger is heated by biogas produced by a circulating flow anaerobic granular sludge bioreactor, or by waste oil collected by pretreatment, or by auxiliary heating with fuel oil or gas.

[0049] The circulating flow anaerobic granular sludge bioreactor in this embodiment is an internal circulation anaerobic reactor. It adopts extremely high hydraulic load to prevent sludge from sinking to the bottom, increase the expansion rate of the sludge bed, improve the effective volume utilization rate, and can also crush the aged sludge and flush the light sludge to the top layer of the reactor, and be taken out by the effluent to achieve the effect of sludge screening and ensure the high density and high activity of the sludge. The COD removal rate is enhanced and the total removal rate is weakened. The effluent with high COD and SS is concentrated by the sludge screening unit and the membrane concentration unit, and then returned to the circulating flow anaerobic granular sludge bioreactor as a high-concentration COD concentrate for further decomposition, forming a dual-circulation treatment mode of organic matter and activated sludge.

[0050] The sludge screening unit includes a cyclone separator, an inlet guide pipe, an outlet diverter pipe, and a sludge discharge pipe. The water inlet of the cyclone separator is connected to the water outlet of the circulating flow anaerobic granular sludge bioreactor through the inlet guide pipe, the drain outlet of the cyclone separator is connected to the membrane concentration unit through the outlet diverter pipe, and the sludge discharge outlet of the cyclone separator is connected to the sludge storage tank through the sludge discharge pipe.

[0051] The effluent from the circulating flow anaerobic granular sludge bioreactor has a large hydraulic elevation that can be utilized. The effluent from the internal circulation anaerobic reactor enters the cyclone separator through the water inlet guide pipe to reduce pipeline water loss. The water level potential energy in the cyclone separator is fully converted into cyclone kinetic energy to separate the aged sludge with higher density. The newly generated flocculent sludge has a small density difference with water. By controlling the centrifugal speed and the diversion flow rate, most of the newly generated flocculent sludge is discharged together with the sewage and enters the membrane concentration unit for treatment, which enables the microbial community in the circulating flow anaerobic granular sludge bioreactor to always be highly active.

[0052] In order to facilitate the adjustment of the alkalinity and pH of the adsorbed mud water and the concentrated liquid, as well as to mix the adsorbed mud water and the concentrated liquid, a confluence buffer tank is installed at the inlet of the lifting pump. The confluence buffer tank is connected to the adsorbed mud water discharge port of the biological adsorption concentration tank and the concentrated liquid outlet of the membrane concentration unit through a confluence pipe respectively. An alkalinity online monitor and a first PH online monitor are installed in the confluence buffer tank. A second PH online monitor is installed in the circulating flow anaerobic granular sludge bioreactor. A PLC controller, an injection pump for injecting carbonate buffer into the confluence buffer tank, and a reagent barrel filled with carbonate buffer are installed on the confluence buffer tank. The signal receiving end of the PLC controller is connected to the online monitor, the first PH online monitor, and the second PH online monitor through cables respectively, and the signal output end of the PLC controller is connected to the injection pump through cables. The liquid inlet of the injection pump is equipped with a liquid collection tube inserted into the reagent barrel, and the liquid outlet of the injection pump is equipped with an injection tube inserted into the confluence buffer tank. The PLC controller determines the amount of carbonate buffer to be added to the confluence buffer tank according to the received alkalinity value and pH value, thereby controlling the working state of the injection pump.

[0053] When the influent concentration of the circulating flow anaerobic granular sludge bioreactor is lower than the threshold, the sludge stored in the sludge storage tank is added to the circulating flow anaerobic granular sludge bioreactor for anaerobic biological treatment. While ensuring the stable operation of the circulating flow anaerobic granular sludge bioreactor, the sludge can be reduced, stabilized and recycled.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for treating organic wastewater, characterized in that: The following steps are involved: S1. Pre-treating the organic wastewater to remove waste oil and waste residue to form pre-treated wastewater; S2, the pre-treated wastewater and the endogenous respiration period sludge of the back-end biochemical return are passed into the biosorption concentration tank for biosorption, the returned sludge adsorbs the suspended matter, grease, and some soluble organic matter in the pre-treated wastewater that are not completely removed to form adsorbed muddy water with high concentration of organic matter, and some soluble organic matter, suspended matter and grease in the pre-treated wastewater are adsorbed and removed to form a supernatant; S3, passing the supernatant into a membrane concentration unit for membrane concentration treatment to produce a concentrated solution and clear water; S4, using a lift pump to pump the adsorbed sludge water and concentrated liquid to a circulating flow anaerobic granular sludge bioreactor for anaerobic biological treatment, the sludge produced in the circulating flow anaerobic granular sludge bioreactor is discharged into a sludge storage tank for collection and storage, the effluent of the circulating flow anaerobic granular sludge bioreactor is separated by a sludge screening unit and then introduced into a membrane concentration unit, and the sludge separated by the sludge screening unit is discharged into a sludge storage tank for collection and storage; S5, using the AAO-MBR biochemical treatment system to perform deep biochemical treatment on the clean water generated by the membrane concentration unit to produce sludge and discharge water, a part of the sludge generated by the AAO-MBR biochemical treatment system is returned to the biological adsorption concentration tank, and the remaining sludge generated by the AAO-MBR biochemical treatment system is discharged into the sludge storage tank for collection and storage; S6. Disinfect and meter the effluent generated by the AAO-MBR biochemical treatment system before discharging it.

2. The method for treating organic wastewater according to claim 1, characterized in that: The biological adsorption concentration tank is equipped with a rapid separation mechanism for rapidly separating adsorbed mud and water from supernatant, the rapid separation mechanism comprising a sludge hopper and a water collecting trough, the water collecting trough being located at the upper part of the sludge hopper, a plurality of mud guide plates with a slope of 60° being arranged at the lower part of the sludge hopper, a plurality of evenly distributed water holes being arranged at the top of the mud guide plates, and a slag retaining plate being fixedly connected to the two long sides of the water collecting trough respectively.

3. The method for treating organic wastewater according to claim 1, characterized in that: A sludge return pipe and a pretreated wastewater input pipe are installed on one side of the biological adsorption concentration tank. An electromagnetic flow valve for monitoring the sludge return speed and a flow regulating valve for adjusting the sludge return speed are installed on the sludge return pipe. A first submersible flow agitator for promoting full mixing of the returned sludge and the pretreated wastewater is also installed in the biological adsorption concentration tank.

4. The method for treating organic wastewater according to claim 1, characterized in that: The membrane concentration unit includes a membrane concentration tank and an ultrafiltration membrane group. The ultrafiltration membrane group is installed in the membrane concentration tank. A clean water outlet is provided on the ultrafiltration membrane group. A concentrated liquid outlet is provided at one end of the membrane concentration tank. A second submersible flow agitator for depositing sludge toward the concentrated liquid outlet is also installed in the membrane concentration tank.

5. The method for treating organic wastewater according to claim 1, characterized in that: An online thermometer is installed at the water inlet end of the lift pump, and a heat exchanger for heating the adsorbed mud water and concentrated liquid is installed at the water outlet end of the lift pump.

6. The method for treating organic wastewater according to claim 5, characterized in that: The heat exchanger is heated by the biogas generated by the circulating flow anaerobic granular sludge bioreactor, or by the waste oil collected by pretreatment, or by auxiliary heating by fuel oil or gas.

7. The method for treating organic wastewater according to claim 1, characterized in that: The sludge screening unit includes a cyclone separator, an inlet guide pipe, an outlet diverter pipe, and a sludge discharge pipe. The water inlet of the cyclone separator is connected to the water outlet of the circulating flow anaerobic granular sludge bioreactor through the inlet guide pipe, the water outlet of the cyclone separator is connected to the membrane concentration unit through the outlet diverter pipe, and the sludge discharge port of the cyclone separator is connected to the sludge storage tank through the sludge discharge pipe.

8. The method for treating organic wastewater according to claim 1, characterized in that: The circulating flow anaerobic granular sludge bioreactor is an internal circulation anaerobic reactor.

9. The method for treating organic wastewater according to claim 1, characterized in that: A confluence buffer tank is installed at the inlet of the lifting pump, and the confluence buffer tank is connected with the adsorption mud water discharge port of the biological adsorption concentration tank and the concentrated liquid outlet of the membrane concentration unit through a confluence pipe respectively. An alkalinity online monitor and a first pH online monitor are installed in the confluence buffer tank, and a second pH online monitor is installed in the circulating flow anaerobic granular sludge bioreactor. A PLC controller, an injection pump for injecting carbonate buffer into the confluence buffer tank, and a reagent barrel filled with carbonate buffer are installed on the confluence buffer tank. The signal receiving end of the PLC controller is connected to the online monitor, the first pH online monitor, and the second pH online monitor through cables respectively, and the signal output end of the PLC controller is connected to the injection pump through a cable. The liquid inlet of the injection pump is installed with a liquid collection tube inserted into the reagent barrel, and the liquid outlet of the injection pump is installed with an injection tube inserted into the confluence buffer tank.

10. The method for treating organic wastewater according to claim 1, characterized in that: When the influent concentration of the circulating flow anaerobic granular sludge bioreactor is lower than a threshold value, the sludge stored in the sludge storage tank is added to the circulating flow anaerobic granular sludge bioreactor for anaerobic biological treatment.

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