CN218345278U - Multi-source organic solid waste and anaerobic digestion biogas slurry efficient deep denitrification system - Google Patents

Abstract

The utility model relates to the technical field of high-ammonia-nitrogen sewage treatment, in particular to a multi-source organic solid waste cooperative anaerobic digestion biogas slurry efficient and deep denitrification system. The multi-source organic solid waste to be treated in conjunction with anaerobic digestion biogas slurry first enters the anaerobic treatment unit for denitrification process; the effluent from the anaerobic treatment unit flows into the aerobic treatment unit to remove the remaining organic matter and part of the suspended solids, and part of the effluent is introduced into the suspended solids treatment The unit performs chemical conditioning and centrifugal separation to enhance the removal of suspended solids, and another part of the effluent is returned to the anaerobic treatment unit; the effluent from the suspended solids treatment unit enters the PN-A treatment unit for short-range nitrification-anammox process to strengthen the removal of ammonia nitrogen , part of the effluent is returned to the anaerobic treatment unit to further strengthen the removal of nitrate nitrogen, and the remaining part is directly discharged. The utility model overcomes the unfavorable conditions such as low carbon-nitrogen ratio of digested biogas slurry and complex components, and does not need to add organic carbon sources, and the aeration rate is low, which greatly reduces processing costs and energy consumption.

Description

A high-efficiency deep denitrification system for multi-source organic solid waste synergistic anaerobic digestion biogas slurry

technical field

The utility model relates to the technical field of high-ammonia-nitrogen sewage treatment, in particular to a multi-source organic solid waste cooperative anaerobic digestion biogas slurry efficient and deep denitrification system.

Background technique

With the continuous development of urbanization and economic production, the output of organic solid waste with high water content represented by kitchen waste, kitchen waste and residual sludge is increasing. At present, the anaerobic digestion process is usually used to realize the treatment and recycling of organic solid waste. However, after the multi-source organic solid waste collaborative anaerobic digestion process is completed, a large amount of anaerobic digestion biogas slurry will be produced, which contains a relatively high concentration of ammonia nitrogen and a certain concentration of phosphorus. If it is not treated effectively, it will easily cause damage. Eutrophication of water bodies. Therefore, the efficient deep denitrification of biogas slurry is of great significance for the final disposal of multi-source organic solid waste and the protection of the surrounding environment.

Biological nitrogen removal is still the most effective, economical and feasible nitrogen removal process in sewage. Due to the high nitrogen and low carbon characteristics of biogas slurry, the traditional nitrification and denitrification pathways cannot achieve efficient deep denitrification of biogas slurry without adding organic carbon sources such as sodium acetate. Therefore, the application of the anammox process, which can achieve autotrophic denitrification, in the denitrification of anaerobic digested biogas slurry has received more and more attention. The anaerobic ammonium oxidation process usually uses ammonia nitrogen as the electron donor and nitrite nitrogen as the electron acceptor to convert nitrogen into nitrogen gas for removal. Nitrogen in anaerobic digestion biogas slurry mainly exists in the form of ammonia nitrogen (the concentration of ammonia nitrogen is usually 2000-3000mg/L), and the nitrite nitrogen required for the anaerobic ammonium oxidation process does not exist stably in a large amount in the biogas slurry, so Usually, the ammonia nitrogen in the biogas slurry is partially converted into nitrite nitrogen through the short-cut nitrification process, and then the anammox process is performed, that is, the two-stage short-cut nitrification anammox denitrification process. However, the two-stage process does not have advantages in terms of floor area, infrastructure investment, operation and maintenance.

On an engineering scale, the stability of the anammox system is poor. Anammox bacteria are very vulnerable to the impact of suspended solids (SS), organic matter (BOD) and other microorganisms in sewage, while anaerobic digested biogas slurry usually has high SS, a certain concentration of organic matter and complex microbial composition. Therefore, the method of removing interference factors and enhancing operation stability remains to be studied, otherwise it will limit the development of high-efficiency and deep denitrification process of anaerobic digested biogas slurry.

In addition, due to the limitations of its own characteristics, the anammox process will still produce a small amount of nitrate nitrogen while denitrification. In the case of a high concentration of ammonia nitrogen in the influent, the nitrate nitrogen in the effluent water is high, resulting in the failure to achieve the goal of deep denitrification, and further removal of nitrate nitrogen is required to meet the emission requirements.

Utility model content

In order to solve the shortcomings in the anaerobic digestion biogas slurry denitrification technology based on the anaerobic ammonium oxidation process, the purpose of this utility model is to provide a multi-source organic solid waste collaborative anaerobic digestion biogas slurry efficient deep nitrogen removal system, which will be Treatment of multi-source organic solid waste with synergistic anaerobic digestion The biogas slurry first enters the anaerobic treatment unit for denitrification; the effluent from the anaerobic treatment unit flows into the aerobic treatment unit to remove the remaining organic matter and part of the suspended solids, and part of the effluent is introduced into the suspended solids treatment unit for further processing Chemical conditioning and centrifugal separation are used to strengthen the removal of suspended solids, and another part of the effluent is returned to the anaerobic treatment unit; the effluent of the suspended solids treatment unit enters the PN-A treatment unit for short-range nitrification-anammox process to strengthen the removal of ammonia nitrogen, and the effluent Part of it is returned to the anaerobic treatment unit to further strengthen the removal of nitrate nitrogen, and the rest is directly discharged. The utility model overcomes the unfavorable conditions such as complex composition of the digested biogas slurry and many interference factors, and does not need to add organic carbon sources, and the aeration volume is low, which greatly reduces the processing cost and energy consumption, so as to solve the problems existing in the current biogas slurry biological treatment technology. Incomplete denitrification, poor stability and other problems.

The purpose of this utility model can be achieved through the following technical solutions:

The utility model provides a multi-source organic solid waste collaborative anaerobic digestion biogas slurry high-efficiency deep denitrification system, including anaerobic treatment unit, aerobic treatment unit, suspended matter treatment unit and PN-A treatment unit;

The anaerobic treatment unit includes an anaerobic reactor and a first constant temperature control device, and the first constant temperature control device is arranged on the outer layer of the anaerobic reactor;

The aerobic treatment unit includes an aerobic reactor, a first aeration device, a first dissolved oxygen detection electrode, a second constant temperature control device and a first reflux device, the second constant temperature control device is arranged on the outer layer of the aerobic reactor, The aerobic reactor is connected with the first aeration device, the first dissolved oxygen detection electrode and the first reflux device;

The suspended matter processing unit includes a fully automatic coagulation device and a centrifugal separation device; the automatic coagulation device is connected to the centrifugal separation device;

The PN-A processing unit includes a PN-A reactor, a second aeration device, a second dissolved oxygen detection electrode, a third constant temperature control device, a second reflux device and a pH detection electrode, and the third constant temperature control device is set at PN -A reactor outer layer, the PN-A reactor is connected to the second aeration device, the second dissolved oxygen detection electrode, the pH detection electrode and the second reflux device;

Multi-source organic solid waste collaborative anaerobic digestion biogas slurry enters the anaerobic reactor through the inlet of the anaerobic reactor, and the outlet of the anaerobic reactor is connected to the inlet of the aerobic reactor; the outlet of the aerobic reactor is connected to the inlet of the automatic coagulation device, and the aerobic The outlet of the reactor is also connected to the inlet of the anaerobic reactor through the first reflux device; the outlet of the automatic coagulation device is connected to the inlet of the centrifugal separation device, the outlet of the centrifugal separation device is connected to the inlet of the PN-A reactor, and the outlet of the PN-A reactor is connected to the water outlet. The outlet of the PN-A reactor is also connected to the inlet of the anaerobic reactor through a second reflux device.

In one embodiment of the present utility model, in the aerobic treatment unit, part of the effluent is returned to the anaerobic treatment unit to strengthen the removal of nitrate nitrogen and organic matter.

In one embodiment of the present invention, in the PN-A treatment unit, the effluent part is returned to the anaerobic treatment unit to strengthen the removal of nitrate nitrogen, so as to remove the nitrate nitrogen by-product of the anammox process as much as possible.

In one embodiment of the present utility model, the anaerobic treatment unit is used to remove nitrate nitrogen and consume organic matter through a denitrification process;

The aerobic treatment unit is used to treat the remaining organic matter in the anaerobic treatment unit (including removing the bioavailable organic matter that is not utilized by the microorganisms in the previous unit and decomposing part of the difficult bioavailable macromolecular organic matter into organic matter with strong biodegradability) and Remove part of SS; at the same time, the aerobic treatment unit also has a part of nitrification function, accumulating nitrite nitrogen for subsequent process utilization;

The suspended solids treatment unit is used for the further removal of remaining SS in the sewage, and the killing of microorganisms in the sewage (chemical conditioning process), so as to avoid complex microorganisms from interfering with the operation stability of the subsequent PN-A treatment unit;

The PN-A treatment unit is used for short-range nitrification-anammox treatment process.

In one embodiment of the present utility model, the multi-source organic solid waste synergistic anaerobic digestion biogas slurry is a mixture of two or three kinds of solid wastes from kitchen waste, kitchen waste or residual sludge and undergoes anaerobic Biogas slurry produced after digestive system treatment;

The COD of the multi-source organic solid waste collaborative anaerobic digestion biogas slurry is 7000-10000 mg/L, the ammonia nitrogen content is 1500-2500 mg/L, the total nitrogen content is 4000-6000 mg/L, and C/N<2.

In one embodiment of the present utility model, described anaerobic reactor is provided with light self-supporting type filler; one or several;

The density of the light autotrophic filler is 0.1-0.3g/cm ³ , and the filling rate is 30-50%.

In one embodiment of the present invention, the lightweight autotrophic filler is loaded with one or more of sulfur-based materials or iron-based materials;

The sulfur-based material is selected from one or more of sulfur, pyrite, sphalerite;

The iron-based material is selected from one or more of siderite, reduced iron powder, and iron shavings.

In one embodiment of the present invention, the lightweight autotrophic filler is used to enhance the growth of microorganisms and provide electron donor materials for autotrophic denitrification.

In one embodiment of the present utility model, in the anaerobic reactor, the dissolved oxygen concentration is 0.01-0.20 mg/L, the pH is 7.0-8.0, and the temperature is 20-30°C.

In one embodiment of the present utility model, in the aerobic reactor, the dissolved oxygen concentration is 0.8-2.0 mg/L, the pH is 8.0-8.5, and the temperature is 30-35°C.

In one embodiment of the present utility model, in the aerobic treatment unit, the sludge concentration is 2500-3500 mg/L.

In one embodiment of the present invention, the content of suspended solids in the effluent of the centrifugal separation device is less than 1000 mg/L.

In one embodiment of the present invention, in the PN-A reactor, the dissolved oxygen concentration is 0.2-0.8mg/L, the pH is 8.0-8.5, and the temperature is 33-35°C.

In one embodiment of the present utility model, the PN-A treatment unit adopts PN-A granular sludge technology.

The utility model provides a multi-source organic solid waste collaborative anaerobic digestion biogas slurry efficient and deep denitrification process, which includes the following steps:

(1) The multi-source organic solid waste to be treated in conjunction with anaerobic digestion biogas slurry first enters the anaerobic treatment unit for denitrification process;

(2) The effluent from the anaerobic treatment unit flows into the aerobic treatment unit to remove remaining organic matter and some suspended solids;

(3) Part of the effluent from the aerobic treatment unit is introduced into the suspended solids treatment unit for chemical conditioning and centrifugal separation to strengthen the removal of suspended solids, and the other part of the effluent is returned to the anaerobic treatment unit;

(4) The effluent from the suspended solids treatment unit enters the PN-A treatment unit for short-range nitrification-anammox process to strengthen the removal of ammonia nitrogen, and part of the effluent flows back to the anaerobic treatment unit to further strengthen the removal of nitrate nitrogen, and the remaining part is directly discharged .

In one embodiment of the present invention, in step (3), the reflux flow rate of the backflow water from the aerobic treatment unit to the anaerobic treatment unit accounts for 60-80% of the total flow of the aerobic treatment unit;

In step (4), the reflux flow rate of the reflux water from the PN-A treatment unit to the anaerobic treatment unit is 200-300% of the influent flow rate of the multi-source organic solid waste to be treated in conjunction with the anaerobic digestion biogas slurry, so as to strengthen the nitric acid The removal of salt nitrogen improves the total nitrogen removal rate of the whole system.

In one embodiment of the present invention, in the PN-A treatment unit, the short-range nitrification-anammox granular sludge process is adopted, and the composite metal magnesium salt is regularly added to maintain the stability and growth of the granular sludge.

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

(1) The traditional biological denitrification process often requires high C/N in sewage to ensure the progress and effect of the denitrification process, so it is often necessary to add organic carbon sources such as sodium acetate externally. The utility model mainly relies on the autotrophic process to achieve high-efficiency and deep denitrification of anaerobic digested biogas slurry with C/N<2 without speculating in any form of carbon source, and effectively reduces the cost of denitrification. Moreover, the utility model adopts a short-range nitrification-anammox process in the PN-A treatment unit to realize short-range nitrification and autotrophic removal of ammonia nitrogen in one step, effectively improving the denitrification efficiency.

(2) The utility model is provided with a front-end anaerobic treatment unit, which utilizes the organic matter present in the influent water as a carbon source to remove the nitrate nitrogen (mainly produced by the anaerobic ammonium oxidation process) in the influent water and the PN-A treatment unit backflow, That is to say, the deep removal of nitrogen and organic matter are realized, and the risk of organic matter impacting the subsequent anammox process is reduced.

(3) The utility model is provided with an aerobic treatment unit, which can further reduce organic matter and suspended solids in the sewage on the basis of the previous step process, and avoid these pollutants from affecting the PN-A treatment unit (short-range nitrification-anaerobic ammonia At the same time, the unit also has the function of short-range nitrification, which is expected to accumulate nitrite nitrogen and reduce the aeration rate of the PN-A treatment unit and the pressure of the short-range nitrification process.

Description of drawings

Figure 1 is a schematic diagram of a multi-source organic solid waste cooperative anaerobic digestion biogas slurry efficient deep denitrification system of the present invention;

Fig. 2 is a schematic diagram of a multi-source organic solid waste cooperative anaerobic digestion biogas slurry efficient deep denitrification process of the present invention;

Fig. 3 is the water quality change situation diagram before and after the anaerobic digestion biogas slurry treatment of multi-source organic solid waste in embodiment 2;

Labels in the figure: 1. Anaerobic treatment unit; 2. Aerobic treatment unit; 3. Suspended solids treatment unit; 4. PN-A treatment unit; 5. Automatic control device; 6. pH automatic adjustment device; 11. Anaerobic Reactor; 12. First constant temperature control device; 21. Aerobic reactor; 22. Second constant temperature control device; 23. First dissolved oxygen detection electrode; 24. First aeration device; 25. First reflux device; 31. Fully automatic coagulation device; 32. Centrifugal separation device; 41. PN-A reactor; 42. The third constant temperature control device; 43. The second dissolved oxygen detection electrode; 44. The second aeration device; 45. The first 2. Reflux device; 46. pH detection electrode; 311. Dosing port; 321. Slag discharge port.

Detailed ways

The utility model provides a multi-source organic solid waste collaborative anaerobic digestion biogas slurry high-efficiency deep denitrification system, including anaerobic treatment unit, aerobic treatment unit, suspended matter treatment unit and PN-A treatment unit;

The anaerobic treatment unit includes an anaerobic reactor and a first constant temperature control device, and the first constant temperature control device is arranged on the outer layer of the anaerobic reactor;

The aerobic treatment unit includes an aerobic reactor, a first aeration device, a first dissolved oxygen detection electrode, a second constant temperature control device and a first reflux device, the second constant temperature control device is arranged on the outer layer of the aerobic reactor, The aerobic reactor is connected with the first aeration device, the first dissolved oxygen detection electrode and the first reflux device;

The suspended matter processing unit includes a fully automatic coagulation device and a centrifugal separation device; the automatic coagulation device is connected to the centrifugal separation device;

The PN-A processing unit includes a PN-A reactor, a second aeration device, a second dissolved oxygen detection electrode, a third constant temperature control device, a second reflux device and a pH detection electrode, and the third constant temperature control device is set at PN -A reactor outer layer, the PN-A reactor is connected to the second aeration device, the second dissolved oxygen detection electrode, the pH detection electrode and the second reflux device;

Multi-source organic solid waste collaborative anaerobic digestion biogas slurry enters the anaerobic reactor through the inlet of the anaerobic reactor, and the outlet of the anaerobic reactor is connected to the inlet of the aerobic reactor; the outlet of the aerobic reactor is connected to the inlet of the automatic coagulation device, and the aerobic The outlet of the reactor is also connected to the inlet of the anaerobic reactor through the first reflux device; the outlet of the automatic coagulation device is connected to the inlet of the centrifugal separation device, the outlet of the centrifugal separation device is connected to the inlet of the PN-A reactor, and the outlet of the PN-A reactor is connected to the water outlet. The outlet of the PN-A reactor is also connected to the inlet of the anaerobic reactor through a second reflux device.

In one embodiment of the present utility model, in the aerobic treatment unit, part of the effluent is returned to the anaerobic treatment unit to strengthen the removal of nitrate nitrogen and organic matter.

In one embodiment of the present invention, in the PN-A treatment unit, the effluent part is returned to the anaerobic treatment unit to strengthen the removal of nitrate nitrogen, so as to remove the nitrate nitrogen by-product of the anammox process as much as possible.

In one embodiment of the present utility model, the anaerobic treatment unit is used to remove nitrate nitrogen and consume organic matter through a denitrification process;

The aerobic treatment unit is used to treat the remaining organic matter in the anaerobic treatment unit (including removing the bioavailable organic matter that is not utilized by the microorganisms in the previous unit and decomposing part of the difficult bioavailable macromolecular organic matter into organic matter with strong biodegradability) and Remove part of SS; at the same time, the aerobic treatment unit also has a part of nitrification function, accumulating nitrite nitrogen for subsequent process utilization;

The suspended solids treatment unit is used for the further removal of remaining SS in the sewage, and the killing of microorganisms in the sewage (chemical conditioning process), so as to avoid complex microorganisms from interfering with the operation stability of the subsequent PN-A treatment unit;

The PN-A treatment unit is used for short-range nitrification-anammox treatment process.

In one embodiment of the present utility model, the multi-source organic solid waste synergistic anaerobic digestion biogas slurry is a mixture of two or three kinds of solid wastes from kitchen waste, kitchen waste or residual sludge and undergoes anaerobic Biogas slurry produced after digestive system treatment;

The COD of the multi-source organic solid waste collaborative anaerobic digestion biogas slurry is 7000-10000 mg/L, the ammonia nitrogen content is 1500-2500 mg/L, the total nitrogen content is 4000-6000 mg/L, and C/N<2.

In one embodiment of the present utility model, described anaerobic reactor is provided with light self-supporting type filler; one or several;

The density of the light autotrophic filler is 0.1-0.3g/cm ³ , and the filling rate is 30-50%.

In one embodiment of the present invention, the lightweight autotrophic filler is loaded with one or more of sulfur-based materials or iron-based materials;

The sulfur-based material is selected from one or more of sulfur, pyrite, sphalerite;

The iron-based material is selected from one or more of siderite, reduced iron powder, and iron shavings.

In one embodiment of the present invention, the lightweight autotrophic filler is used to enhance the growth of microorganisms and provide electron donor materials for autotrophic denitrification.

In one embodiment of the present utility model, in the anaerobic reactor, the dissolved oxygen concentration is 0.01-0.20 mg/L, the pH is 7.0-8.0, and the temperature is 20-30°C.

In one embodiment of the present utility model, in the aerobic reactor, the dissolved oxygen concentration is 0.8-2.0 mg/L, the pH is 8.0-8.5, and the temperature is 30-35°C.

In one embodiment of the present utility model, in the aerobic treatment unit, the sludge concentration is 2500-3500 mg/L.

In one embodiment of the present invention, the content of suspended solids in the effluent of the centrifugal separation device is less than 1000 mg/L.

In one embodiment of the present invention, in the PN-A reactor, the dissolved oxygen concentration is 0.2-0.8mg/L, the pH is 8.0-8.5, and the temperature is 33-35°C.

In one embodiment of the present utility model, the PN-A treatment unit adopts PN-A granular sludge technology.

The utility model provides a multi-source organic solid waste collaborative anaerobic digestion biogas slurry efficient and deep denitrification process, which includes the following steps:

(1) The multi-source organic solid waste to be treated in conjunction with anaerobic digestion biogas slurry first enters the anaerobic treatment unit for denitrification process;

(2) The effluent from the anaerobic treatment unit flows into the aerobic treatment unit to remove remaining organic matter and some suspended solids;

(3) Part of the effluent from the aerobic treatment unit is introduced into the suspended solids treatment unit for chemical conditioning and centrifugal separation to strengthen the removal of suspended solids, and the other part of the effluent is returned to the anaerobic treatment unit;

(4) The effluent from the suspended solids treatment unit enters the PN-A treatment unit for short-range nitrification-anammox process to strengthen the removal of ammonia nitrogen, and part of the effluent flows back to the anaerobic treatment unit to further strengthen the removal of nitrate nitrogen, and the remaining part is directly discharged .

In one embodiment of the present invention, in step (3), the reflux flow rate of the backflow water from the aerobic treatment unit to the anaerobic treatment unit accounts for 60-80% of the total flow of the aerobic treatment unit;

In step (4), the reflux flow rate of the reflux water from the PN-A treatment unit to the anaerobic treatment unit is 200-300% of the influent flow rate of the multi-source organic solid waste to be treated in conjunction with the anaerobic digestion biogas slurry, so as to strengthen the nitric acid The removal of salt nitrogen improves the total nitrogen removal rate of the whole system.

In one embodiment of the present invention, in the PN-A treatment unit, the short-range nitrification-anammox granular sludge process is adopted, and the composite metal magnesium salt is regularly added to maintain the stability and growth of the granular sludge.

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

In the following examples, unless otherwise specified, the reagents used are all commercially available reagents; the detection methods and means are all conventional detection methods and means in the art.

Example 1

This embodiment provides a high-efficiency deep denitrification system for anaerobic digestion of biogas slurry from multi-source organic solid waste.

As shown in Figure 1, a multi-source organic solid waste anaerobic digestion biogas slurry high-efficiency deep denitrification system, including anaerobic treatment unit 1, aerobic treatment unit 2, suspended solids treatment unit 3 and PN-A treatment unit 4;

The anaerobic treatment unit 1 comprises an anaerobic reactor 11 and a first constant temperature control device 12, and the first constant temperature control device 12 is arranged on the outer layer of the anaerobic reactor 11;

The aerobic treatment unit 2 includes an aerobic reactor 21, a first aeration device 24, a first dissolved oxygen detection electrode 23, a second constant temperature control device 22 and a first reflux device 25, and the second constant temperature control device 22 is arranged on the aerobic The outer layer of the reactor 21, the aerobic reactor 21 is provided with an aeration pan and connected to the first aeration device 24, and the aerobic reactor 21 is also connected to the first dissolved oxygen detection electrode 23 and the first reflux device 25 ;

The suspended solids processing unit 3 includes a fully automatic coagulation device 31 and a centrifugal separation device 32; the automatic coagulation device 31 is connected to the centrifugal separation device 32; the automatic coagulation device 31 is provided with a dosing port 311 for adding composite metal magnesium salt medicament, The centrifugal separation device 32 is provided with a slag discharge port 321;

The PN-A processing unit 4 includes a PN-A reactor 41, a second aeration device 44, a second dissolved oxygen detection electrode 43, a third constant temperature control device 42, a second reflux device 45 and a pH detection electrode 46, and the third constant temperature The control device 42 is arranged on the outer layer of the PN-A reactor 41, the PN-A reactor 41 is provided with an aeration pan and is connected with the second aeration device 44, and the PN-A reactor 41 is also connected with the second dissolved oxygen detection The electrode 43, the pH detection electrode 46 and the second backflow device 45 are connected;

The multi-source organic solid waste anaerobic digestion biogas slurry high-efficiency deep denitrification system is also equipped with an automatic control device 5, and the automatic control device 5 is connected to the first aeration device 24, the second aeration device 44, the first dissolved oxygen detection electrode 23, The second dissolved oxygen detection electrode 43, the pH detection electrode 46 and the pH automatic adjustment device 6;

The automatic control device 5 adopts negative feedback logic control; the first dissolved oxygen detection electrode 23 , the second dissolved oxygen detection electrode 43 , and the pH detection electrode 46 detect actual values and return them to the automatic control device 5 . The automatic control device 5 controls the working frequency of the first aeration device 24, the second aeration device 44, and the pH automatic adjustment device 6 according to the negative feedback adjustment logic to stabilize the dissolved oxygen and pH of the system in the required range. The critical value of the automatic control device 5 is set according to the required conditions of the controlled system.

Multi-source organic solid waste collaborative anaerobic digestion biogas slurry enters anaerobic reactor 11 through the inlet of anaerobic reactor 11, and the outlet of anaerobic reactor 11 is connected to the inlet of aerobic reactor 21; the outlet of aerobic reactor 21 is connected to fully automatic coagulation The inlet of the device 31 and the outlet of the aerobic reactor 21 are also connected to the inlet of the anaerobic reactor 11 through the first reflux device 25; the outlet of the automatic coagulation device 31 is connected to the inlet of the centrifugal separation device 32, and the outlet of the centrifugal separation device 32 is connected to the PN-A reactor 41 inlet, the outlet of PN-A reactor 41 is connected to the water outlet, and the outlet of PN-A reactor 41 is also connected to the inlet of anaerobic reactor 11 through the second backflow device 45 .

Example 2

This embodiment provides a high-efficiency deep denitrification process for anaerobic digestion of biogas slurry from multi-source organic solid waste.

As shown in Figure 2, a multi-source organic solid waste anaerobic digestion biogas slurry high-efficiency deep denitrification process includes the following steps:

(1) The multi-source organic solid waste to be treated in conjunction with anaerobic digestion biogas slurry first enters the anaerobic treatment unit 1 for denitrification process;

(2) step (1) the effluent of the anaerobic treatment unit 1 flows into the aerobic treatment unit 2 to remove the remaining organic matter and part of the suspended solids;

(3) In step (2), the effluent from the aerobic treatment unit 2 enters the suspended solids, and part of the effluent is introduced into the suspended solids treatment unit 3 for chemical conditioning and centrifugation to strengthen the removal of suspended solids, and the other part of the effluent flows back to the anaerobic treatment unit 1;

(4) The effluent of step (3) suspended matter treatment unit 3 enters the PN-A treatment unit 4 for short-range nitrification-anammox process to strengthen the removal of ammonia nitrogen, and the effluent part returns to the anaerobic treatment unit 1 to further strengthen nitrate Nitrogen is removed and some are discharged directly.

The synergistic anaerobic digestion biogas slurry of multi-source organic solid waste to be treated first passes through the anaerobic treatment unit 1 and the aerobic treatment unit 2; then part of the effluent flows back to the anaerobic treatment unit 1, and the other part of the effluent passes through the suspended solids treatment unit 3 and The PN-A treatment unit 4 performs corresponding treatment; since the anaerobic ammonium oxidation process will produce a certain proportion of nitrate nitrogen while denitrification, part of the effluent of the PN-A treatment unit 4 is returned to the anaerobic unit to participate in the reaction again, Enhance denitrification effect.

Multi-source organic solid waste to be treated in conjunction with anaerobic digestion biogas slurry feed water and two-way return liquid enter the anaerobic treatment unit 1 from the bottom, and overflow water from the top; the anaerobic reactor 11 is mounted with a new type of lightweight self-supporting filler (light sponge loaded with sulfur and siderite), its function is to strengthen the growth of microorganisms and provide electron donor materials for autotrophic denitrification, the packing density is 0.2g/cm ³ , and the filling rate is 40%. The dissolved oxygen in the anaerobic reactor 11 is 0.01-0.20mg/L, the pH is 7.0-8.0, and the temperature is 20-30°C.

The aerobic treatment unit 2 adopts upflow operation; the aeration pan is arranged at the bottom of the reaction zone of the aerobic reactor 21, and an automatic control device 5 is used to control the dissolved oxygen concentration in the reaction zone to be 0.8mg/L-2.0mg/L; the pH is controlled at 8.0-8.5, the temperature is 30-35°C; the sludge concentration in the reaction zone is controlled at 2500-3500mg/L. In addition, the effluent part of this unit returns to the anaerobic treatment unit 1, and the return flow accounts for 50% of the total effluent flow, which strengthens the removal of organic matter and suspended solids in sewage.

In the suspended solids treatment unit 3, a new inorganic conditioner is added to improve the solid-liquid separation effect of the sewage, and then the suspended solids in the sewage are removed by centrifugation, and the SS of the sewage entering the PN-A treatment unit 4 is controlled to be less than 1000mg/L. At the same time, the chemical conditioning process also has the function of killing microorganisms in the sewage, avoiding the formation of complex flora from interfering with the stable operation of the subsequent PN-A treatment unit 4 .

PN-A treatment unit 4 adopts the short-range nitrification-anammox granular sludge process, and operates in upflow mode; 0.2-0.3g/L composite metal magnesium salt is added regularly to maintain the stability and growth of granular sludge. In addition, the aeration tray is arranged in the PN-A reactor 41, and the dissolved oxygen concentration in the reaction zone is controlled by the automatic control device 5 to be 0.1mg/L-0.3mg/L; and the pH of the reaction zone of the PN-A reactor 41 is controlled to be 8.0-8.5, the temperature is 33-35°C. The effluent part of PN-A treatment unit 4 returns to the anaerobic treatment unit 1, and the return flow rate is 200%-300% of the influent flow rate of multi-source organic solid waste to be treated in conjunction with anaerobic digestion biogas slurry, the purpose is to remove the remaining in the sewage Nitrate nitrogen, realize the deep denitrification of sewage.

The water quality changes before and after anaerobic digestion biogas slurry treatment of multi-source organic solid waste are shown in Figure 3.

Example 3

This embodiment provides a high-efficiency deep denitrification process for anaerobic digestion of biogas slurry from multi-source organic solid waste.

Process flow is identical with embodiment 2. Among them, the process devices and operating parameters of the anaerobic treatment unit 1, the aerobic treatment unit 2, and the suspended solids treatment unit 3 are the same as those in the second embodiment.

The difference is that the PN-A treatment unit 4 adopts high-concentration powder carrier-granule sludge mixing technology, and operates in an upflow mode; the reaction zone of the PN-A reactor 41 is fed with a new type of silicon-based powder carrier, and its function is to provide The formation of granular sludge provides a core and maintains a high sludge concentration (greater than 10000mg/L) to improve treatment efficiency. Aeration trays are arranged in the PN-A reactor 41, and the dissolved oxygen concentration in the reaction zone is controlled by the automatic control device 5 to be 0.1mg/L-0.3mg/L; and the pH of the control reaction zone is 8.0-8.5, and the temperature is 33-35 °C, the effluent from the reaction zone enters the sedimentation tank for mud-water separation and reflows the sludge to recover the powder carrier lost from the reaction zone. The effluent part of PN-A treatment unit 4 returns to the anaerobic treatment unit 1, and the return flow rate is 200%-300% of the influent flow rate of multi-source organic solid waste to be treated in conjunction with anaerobic digestion biogas slurry, the purpose is to remove the remaining in the sewage Nitrate nitrogen, realize the deep denitrification of sewage.

The above description of the embodiments is for those of ordinary skill in the technical field to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative efforts. Therefore, the utility model is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the utility model without departing from the category of the utility model should be within the protection scope of the utility model.

Claims (10)

1. A multi-source organic solid waste collaborative anaerobic digestion biogas slurry high-efficiency deep denitrification system, characterized in that it includes an anaerobic treatment unit, an aerobic treatment unit, a suspended solids treatment unit and a PN-A treatment unit; The anaerobic treatment unit includes an anaerobic reactor and a first constant temperature control device, and the first constant temperature control device is arranged on the outer layer of the anaerobic reactor; The aerobic treatment unit includes an aerobic reactor, a first aeration device, a first dissolved oxygen detection electrode, a second constant temperature control device and a first reflux device, the second constant temperature control device is arranged on the outer layer of the aerobic reactor, The aerobic reactor is connected with the first aeration device, the first dissolved oxygen detection electrode and the first reflux device; The suspended matter processing unit includes a fully automatic coagulation device and a centrifugal separation device; the automatic coagulation device is connected to the centrifugal separation device; The PN-A processing unit includes a PN-A reactor, a second aeration device, a second dissolved oxygen detection electrode, a third constant temperature control device, a second reflux device and a pH detection electrode, and the third constant temperature control device is set at PN -A reactor outer layer, the PN-A reactor is connected to the second aeration device, the second dissolved oxygen detection electrode, the pH detection electrode and the second reflux device; Multi-source organic solid waste collaborative anaerobic digestion biogas slurry enters the anaerobic reactor through the inlet of the anaerobic reactor, and the outlet of the anaerobic reactor is connected to the inlet of the aerobic reactor; the outlet of the aerobic reactor is connected to the inlet of the automatic coagulation device, and the aerobic The outlet of the reactor is also connected to the inlet of the anaerobic reactor through the first reflux device; the outlet of the automatic coagulation device is connected to the inlet of the centrifugal separation device, the outlet of the centrifugal separation device is connected to the inlet of the PN-A reactor, and the outlet of the PN-A reactor is connected to the water outlet. The outlet of the PN-A reactor is also connected to the inlet of the anaerobic reactor through a second reflux device. 2. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry efficient deep denitrification system according to claim 1, characterized in that the multi-source organic solid waste synergistic anaerobic digestion biogas slurry is kitchen waste, The biogas slurry produced by mixing two or three kinds of solid wastes in kitchen waste or residual sludge and treated by anaerobic digestion system. 3. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry efficient deep denitrification system according to claim 2, characterized in that the COD of the multi-source organic solid waste synergistic anaerobic digestion biogas slurry is 7000- 10000mg/L, ammonia nitrogen content is 1500-2500mg/L, total nitrogen content is 4000-6000mg/L, C/N<2. 4. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry efficient deep denitrification system according to claim 1, characterized in that, the anaerobic reactor is provided with light autotrophic filler; the light The high-quality self-supporting filler is selected from one or more of lightweight sponges, fluffy fiber balls or EPS foamed plastics. 5. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry high-efficiency deep denitrification system according to claim 4, characterized in that the density of the light autotrophic filler is 0.1-0.3g/cm ³ , the filling rate is 30-50%. 6. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry high-efficiency deep denitrification system according to claim 5, characterized in that the light autotrophic filler is loaded with sulfur-based materials or iron-based materials a kind of The sulfur-based material is selected from one of sulfur, pyrite, and sphalerite; The iron-based material is selected from siderite, reduced iron powder, and iron shavings. 7. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry efficient deep denitrification system according to claim 1, characterized in that in the anaerobic reactor, the dissolved oxygen concentration is 0.01mg/L-0.20mg/L L, pH 7.0-8.0, temperature 20-30°C. 8. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry high-efficiency deep denitrification system according to claim 1, characterized in that, in the aerobic reactor, the dissolved oxygen concentration is 0.8-2.0mg/L , the pH is 8.0-8.5, and the temperature is 30-35°C. 9. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry high-efficiency deep denitrification system according to claim 1, characterized in that the content of suspended solids in the effluent of the centrifugal separation device is <1000 mg/L. 10. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry high-efficiency deep denitrification system according to claim 1, characterized in that, in the PN-A reactor, the dissolved oxygen concentration is 0.2-0.8mg/L, The pH is 8.0-8.5 and the temperature is 33-35°C.

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