CN218345278U - Multi-source organic solid waste and anaerobic digestion biogas slurry efficient deep denitrification system - Google Patents
Multi-source organic solid waste and anaerobic digestion biogas slurry efficient deep denitrification system Download PDFInfo
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Abstract
The utility model belongs to the technical field of high ammonia nitrogen sewage treatment technique and specifically relates to a high-efficient degree of depth denitrification system of anaerobic digestion natural pond liquid is in coordination wasted solid to multisource organic. Firstly, the multisource organic solid waste to be treated and anaerobic digestion biogas slurry enter an anaerobic treatment unit to be subjected to denitrification; effluent of the anaerobic treatment unit flows into the aerobic treatment unit to remove residual organic matters and part of suspended solids, one part of the effluent is led into the suspended matter treatment unit to be chemically conditioned and centrifugally separated so as to strengthen the removal of the suspended solids, and the other part of the effluent flows back to the anaerobic treatment unit; and (3) enabling the effluent of the suspended matter treatment unit to enter A PN-A treatment unit to carry out A short-range nitrification-anaerobic ammoniA oxidation process so as to strengthen the removal of ammoniA nitrogen, enabling part of the effluent to flow back to the anaerobic treatment unit, further strengthening the removal of nitrate nitrogen, and directly discharging the rest. The utility model discloses overcome unfavorable conditions such as digestion natural pond liquid carbon nitrogen ratio is low, the composition is complicated to need not to throw and add organic carbon source, the aeration rate is lower, reduces treatment cost and energy consumption by a wide margin.
Description
Technical Field
The utility model belongs to the technical field of high ammonia nitrogen sewage treatment technique and specifically relates to a high-efficient degree of depth denitrification system of anaerobic digestion natural pond liquid is in coordination wasted solid to multisource organic.
Background
With the continuous development of urbanization and economic production, the yield of high-water-content organic solid waste represented by kitchen waste, kitchen waste and excess sludge is continuously increased. At present, the treatment and the recycling of organic solid wastes are generally realized by adopting an anaerobic digestion process. However, after the multi-source organic solid waste is cooperated with the anaerobic digestion process, a large amount of anaerobic digestion biogas slurry is generated, wherein the anaerobic digestion biogas slurry contains ammonia nitrogen with higher concentration and phosphorus with certain concentration, and if the anaerobic digestion biogas slurry is not effectively treated, eutrophication of a receiving water body is easily caused. Therefore, the efficient deep denitrification of the biogas slurry has important significance for realizing the final disposal of multi-source organic solid waste and the protection of the surrounding environment.
Biological denitrification remains the most effective, economical and feasible process for removing nitrogen from sewage. Due to the characteristics of high nitrogen and low carbon of the biogas slurry, the conventional nitrification and denitrification paths cannot realize efficient and deep denitrification of the biogas slurry under the condition of not adding organic carbon sources such as sodium acetate and the like. Therefore, the application of the anaerobic ammonia oxidation process capable of realizing autotrophic nitrogen removal in the denitrification of anaerobic digestion biogas slurry is receiving more and more attention. The anaerobic ammonia oxidation process generally takes ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor to convert nitrogen into nitrogen for removal. Nitrogen in anaerobic digestion biogas slurry mainly exists in an ammonia nitrogen form (the ammonia nitrogen concentration is usually 2000-3000 mg/L), and nitrite nitrogen required in the anaerobic ammonia oxidation process does not exist in a large amount stably in the biogas slurry, so the ammonia nitrogen in the biogas slurry is converted into nitrite nitrogen through a short-cut nitrification process, and then the anaerobic ammonia oxidation process is carried out, namely the two-section short-cut nitrification anaerobic ammonia oxidation denitrification process. However, the two-stage process does not have advantages in terms of floor space, capital investment, operational maintenance, etc.
On an engineering scale, the stability of anammox systems is poor. Anaerobic ammonia oxidizing bacteria are easily impacted by Suspended Solids (SS), organic matters (BOD), other microorganisms and other factors existing in sewage, and anaerobic digestion biogas slurry generally has higher SS, organic matters with certain concentration and complex microorganism composition. Therefore, methods for removing interference factors and enhancing operation stability are yet to be researched, otherwise, the development of the efficient deep denitrification process of the anaerobic digestion biogas slurry is limited.
In addition, due to the limitation of the characteristics, the anaerobic ammonia oxidation process can generate a small amount of nitrate nitrogen while denitrogenating. Under the condition that the concentration of the ammonia nitrogen in the inlet water is high, the nitrate nitrogen in the outlet water is high, so that the aim of deep denitrification cannot be fulfilled, and the emission requirement can be met only by further removing the nitrate nitrogen.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects existing in the anaerobic digestion biogas slurry denitrification technology based on the anaerobic ammonia oxidation process, the utility model aims to provide a multi-source organic solid waste synergistic anaerobic digestion biogas slurry high-efficiency deep denitrification system, the multi-source organic solid waste synergistic anaerobic digestion biogas slurry to be treated firstly enters an anaerobic treatment unit to carry out a denitrification process; effluent of the anaerobic treatment unit flows into the aerobic treatment unit to remove residual organic matters and part of suspended solids, one part of the effluent is led into the suspended matter treatment unit to be chemically conditioned and centrifugally separated so as to strengthen the removal of the suspended solids, and the other part of the effluent flows back to the anaerobic treatment unit; and (3) enabling the effluent of the suspended matter treatment unit to enter A PN-A treatment unit to carry out A short-range nitrification-anaerobic ammoniA oxidation process so as to strengthen the removal of ammoniA nitrogen, enabling part of the effluent to flow back to the anaerobic treatment unit, further strengthening the removal of nitrate nitrogen, and directly discharging the rest. The utility model discloses overcome unfavorable conditions such as digestion natural pond liquid composition complicacy, interference factor are many to need not to throw organic carbon source, the aeration rate is lower, reduces treatment cost and energy consumption by a wide margin, with the not thorough, the relatively poor scheduling problem of stability of denitrogenation that exists in solving current natural pond liquid biological treatment technique.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides A multi-source organic solid waste and anaerobic digestion biogas slurry efficient deep denitrification system, which comprises an anaerobic treatment unit, an aerobic treatment unit, A suspended matter treatment unit and A PN-A treatment unit;
the anaerobic treatment unit comprises 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 comprises an aerobic reactor, a first aeration device, a first dissolved oxygen detection electrode, a second constant temperature control device and a first reflux device, wherein the second constant temperature control device is arranged on the outer layer of the aerobic reactor, and 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 comprises a full-automatic coagulation device and a centrifugal separation device; the full-automatic coagulation device is connected with the centrifugal separation device;
the PN-A treatment unit comprises 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, wherein the third constant temperature control device is arranged on the outer layer of the PN-A reactor, and the PN-A reactor is connected with the second aeration device, the second dissolved oxygen detection electrode, the pH detection electrode and the second reflux device;
the multi-source organic solid waste and anaerobic digestion biogas slurry enter an anaerobic reactor through an inlet of the anaerobic reactor, and an outlet of the anaerobic reactor is connected with an inlet of an aerobic reactor; the outlet of the aerobic reactor is connected with the inlet of the full-automatic coagulation device, and the outlet of the aerobic reactor is also connected with the inlet of the anaerobic reactor through a first reflux device; the outlet of the full-automatic coagulation device is connected with the inlet of the centrifugal separation device, the outlet of the centrifugal separation device is connected with the inlet of the PN-A reactor, the outlet of the PN-A reactor is connected with the water outlet, and the outlet of the PN-A reactor is also connected with the inlet of the anaerobic reactor through A second reflux device.
In one embodiment of the present invention, a portion of the effluent is returned to the anaerobic treatment unit in the aerobic treatment unit to enhance nitrate nitrogen and organic removal.
In one embodiment of the present invention, in the PN-A treatment unit, the effluent is partially returned to the anaerobic treatment unit to enhance nitrate nitrogen removal, so as to remove as much nitrate nitrogen by-product of the anaerobic ammoniA oxidation process as possible.
In one embodiment of the present invention, the anaerobic treatment unit is used to remove nitrate nitrogen and consume organic matter through a denitrification process;
the aerobic treatment unit is used for treating the residual organic matters (including removing the organic matters which are not utilized by the microorganisms in the previous unit but can be utilized biologically and decomposing part of the organic matters with difficultly-biologically-utilized macromolecules into organic matters with stronger biodegradability) in the anaerobic treatment unit and removing part of SS; meanwhile, the aerobic treatment unit has partial nitrification function, and accumulates nitrite nitrogen for subsequent process utilization;
the suspended matter treatment unit is used for further removing the residual SS in the sewage and killing microorganisms in the sewage (chemical conditioning process), so that the phenomenon that the complex microorganisms form interference on the running stability of the subsequent PN-A treatment unit is avoided;
the PN-A treatment unit is used for carrying out A shortcut nitrification-anaerobic ammoniA oxidation treatment process.
In one embodiment of the present invention, the multi-source organic solid waste and anaerobic digestion biogas slurry is biogas slurry produced by mixing two or three solid wastes of kitchen waste, kitchen waste or excess sludge and treating the mixture with an anaerobic digestion system;
the COD of the multi-source organic solid waste synergistic anaerobic digestion biogas slurry is 7000-10000mg/L, the ammonia nitrogen content is 1500-2500mg/L, the total nitrogen content is 4000-6000mg/L, and the C/N is less than 2.
In one embodiment of the present invention, the anaerobic reactor is provided with a light autotrophic filler; the light autotrophic filler is selected from one or more of light sponge, fluffy fiber balls or EPS foaming plastic;
the density of the light autotrophic filler is 0.1-0.3g/cm 3 The filling rate is 30-50%.
In one embodiment of the present invention, the light autotrophic filler is loaded with one or more of a sulfur-based material or an iron-based material;
the sulfur-based material is selected from one or more of sulfur, pyrite and blende;
the iron-based material is selected from one or more of siderite, reduced iron powder and iron flakes.
In one embodiment of the present invention, the light autotrophic filler is used to enhance microbial growth and provide an autotrophic denitrification electron donor material.
In one embodiment of the present invention, the dissolved oxygen concentration in the anaerobic reactor is 0.01 to 0.20mg/L, the pH is 7.0 to 8.0, and the temperature is 20 to 30 ℃.
In one embodiment of the present invention, in the aerobic reactor, the dissolved oxygen concentration is 0.8 to 2.0mg/L, the pH is 8.0 to 8.5, and the temperature is 30 to 35 ℃.
In one embodiment of the present invention, the concentration of the sludge in the aerobic treatment unit is 2500-3500mg/L.
In one embodiment of the present invention, the centrifugal separator apparatus has an effluent suspended solids content of <1000mg/L.
In one embodiment of the present invention, the concentration of dissolved oxygen in the PN-A reactor is 0.2 to 0.8mg/L, the pH is 8.0 to 8.5, and the temperature is 33 to 35 ℃.
In one embodiment of the present invention, the PN-A treatment unit employs PN-A granular sludge technology.
The utility model provides a high-efficient degree of depth denitrogenation technology of organic solid useless anaerobism digestion natural pond liquid of multisource, including following step:
(1) Firstly, the multisource organic solid waste to be treated and anaerobic digestion biogas slurry enter an anaerobic treatment unit to be subjected to denitrification;
(2) The effluent of the anaerobic treatment unit flows into an aerobic treatment unit to remove residual organic matters and part of suspended solids;
(3) One part of the effluent of the aerobic treatment unit is led into a suspended matter treatment unit for chemical conditioning and centrifugal separation to strengthen the removal of suspended solids, and the other part of the effluent flows back to the anaerobic treatment unit;
(4) And (3) enabling the effluent of the suspended matter treatment unit to enter A PN-A treatment unit to carry out A short-range nitrification-anaerobic ammoniA oxidation process so as to strengthen the removal of ammoniA nitrogen, enabling part of the effluent to flow back to the anaerobic treatment unit, further strengthening the removal of nitrate nitrogen, and directly discharging the rest.
In one embodiment of the present invention, in step (3), the reflux flow rate of the reflux water from the aerobic treatment unit to the anaerobic treatment unit accounts for 60-80% of the total effluent flow rate of the aerobic treatment unit;
in the 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 inflow flow rate of the multisource organic solid waste synergistic anaerobic digestion biogas slurry to be treated, so that the removal of nitrate nitrogen is enhanced, and the total nitrogen removal rate of the whole system is improved.
In one embodiment of the utility model, in the PN-A treatment unit, A shortcut nitrification-anaerobic ammoniA oxidation granular sludge process is adopted, and A composite metal magnesium salt medicament is periodically added for maintaining the stability and growth of the granular sludge.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) The traditional biological denitrification process usually requires that sewage has higher C/N to ensure the proceeding and the effect of the denitrification process, so organic carbon sources such as sodium acetate and the like are usually required to be added externally. The utility model discloses need not to put into operation under the condition of carbon source with any form, mainly rely on the autotrophy process to realize effectively having reduced the denitrogenation cost to the high-efficient degree of depth denitrogenation of the anaerobic digestion natural pond liquid that CN < 2. Moreover, the utility model discloses adopt short distance nitrification-anaerobic ammoniA oxidation technology at PN-A processing unit, one-step realization ammoniA nitrogen's short distance is nitrified and autotrophy desorption, has effectively promoted denitrogenation efficiency.
(2) The utility model discloses set up leading anaerobic treatment unit, utilized the organic matter that exists in the intake to get rid of the nitrate nitrogen (mainly produced by the anammox process) of intake and PN-A processing unit backward flow for the carbon source, realized that the degree of depth of nitrogen is got rid of and has been got rid of the organic matter promptly, reduced the risk that the follow-up anammox technology of organic matter impact.
(3) The utility model is provided with an aerobic treatment unit which can further reduce organic matters and suspended solids in the sewage on the basis of the previous process and avoid the pollutants from impacting A PN-A treatment unit (shortcut nitrification-anaerobic ammoniA oxidation process); meanwhile, the unit has A short-cut nitrification function, so that nitrite nitrogen is expected to be accumulated, and the aeration rate of the PN-A treatment unit and the pressure of the short-cut nitrification process are reduced.
Drawings
FIG. 1 is a schematic diagram of a multi-source organic solid waste synergistic anaerobic digestion biogas slurry high-efficiency deep denitrification system of the utility model;
FIG. 2 is a schematic diagram of the efficient deep denitrification process for the multi-source organic solid waste synergistic anaerobic digestion biogas slurry of the present invention;
FIG. 3 is a diagram of water quality change before and after multi-source organic solid waste anaerobic digestion biogas slurry treatment in example 2;
the reference numbers in the figures: 1. an anaerobic treatment unit; 2. an aerobic treatment unit; 3. a suspended matter treatment unit; 4. a PN-A processing unit; 5. an automatic control device; 6. a pH automatic adjusting device; 11. an anaerobic reactor; 12. a first thermostatic control device; 21. an aerobic reactor; 22. a second thermostatic control device; 23. a first dissolved oxygen detection electrode; 24. a first aeration device; 25. a first reflux device; 31. a full-automatic coagulation device; 32. a centrifugal separation device; 41. a PN-A reactor; 42. a third thermostatic control device; 43. a second dissolved oxygen detection electrode; 44. a second aeration device; 45. a second reflux unit; 46. a pH detection electrode; 311. a medicine adding port; 321. a slag discharge port.
Detailed Description
The utility model provides A multi-source organic solid waste synergistic anaerobic digestion biogas slurry high-efficiency deep denitrification system, which comprises an anaerobic treatment unit, an aerobic treatment unit, A suspended matter treatment unit and A PN-A treatment unit;
the anaerobic treatment unit comprises 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 comprises an aerobic reactor, a first aeration device, a first dissolved oxygen detection electrode, a second constant temperature control device and a first reflux device, wherein the second constant temperature control device is arranged on the outer layer of the aerobic reactor, and 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 comprises a full-automatic coagulation device and a centrifugal separation device; the full-automatic coagulation device is connected with the centrifugal separation device;
the PN-A treatment unit comprises 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, wherein the third constant temperature control device is arranged on the outer layer of the PN-A reactor, and the PN-A reactor is connected with the second aeration device, the second dissolved oxygen detection electrode, the pH detection electrode and the second reflux device;
the multi-source organic solid waste and anaerobic digestion biogas slurry enter an anaerobic reactor through an inlet of the anaerobic reactor, and an outlet of the anaerobic reactor is connected with an inlet of an aerobic reactor; the outlet of the aerobic reactor is connected with the inlet of the full-automatic coagulation device, and the outlet of the aerobic reactor is also connected with the inlet of the anaerobic reactor through a first reflux device; the outlet of the full-automatic coagulation device is connected with the inlet of the centrifugal separation device, the outlet of the centrifugal separation device is connected with the inlet of the PN-A reactor, the outlet of the PN-A reactor is connected with the water outlet, and the outlet of the PN-A reactor is also connected with the inlet of the anaerobic reactor through A second reflux device.
In one embodiment of the present invention, a portion of the effluent is returned to the anaerobic treatment unit in the aerobic treatment unit to enhance nitrate nitrogen and organic removal.
In one embodiment of the present invention, in the PN-A treatment unit, the effluent is partially returned to the anaerobic treatment unit to enhance nitrate nitrogen removal, so as to remove as much nitrate nitrogen by-product of the anaerobic ammoniA oxidation process as possible.
In one embodiment of the present invention, the anaerobic treatment unit is used to remove nitrate nitrogen and consume organic matter by a denitrification process;
the aerobic treatment unit is used for treating the residual organic matters (including removing organic matters which are not utilized by the microorganisms in the previous unit but can be utilized biologically and decomposing part of the organic matters with difficult biological utilization macromolecules into organic matters with strong biodegradability) in the anaerobic treatment unit and removing part of SS; meanwhile, the aerobic treatment unit has partial nitrification function, and accumulates nitrite nitrogen for subsequent process utilization;
the suspended matter treatment unit is used for further removing the residual SS in the sewage and killing microorganisms in the sewage (chemical conditioning process), so that the phenomenon that the complex microorganisms form interference on the running stability of the subsequent PN-A treatment unit is avoided;
the PN-A treatment unit is used for carrying out A shortcut nitrification-anaerobic ammoniA oxidation treatment process.
In one embodiment of the utility model, the multi-source organic solid waste and anaerobic digestion biogas slurry is biogas slurry produced by mixing two or three solid wastes of kitchen waste, kitchen waste or residual sludge and treating the mixture by an anaerobic digestion system;
the COD of the multi-source organic solid waste synergistic anaerobic digestion biogas slurry is 7000-10000mg/L, the ammonia nitrogen content is 1500-2500mg/L, the total nitrogen content is 4000-6000mg/L, and the C/N is less than 2.
In one embodiment of the present invention, the anaerobic reactor is provided with a light autotrophic filler; the light autotrophic filler is selected from one or more of light sponge, fluffy fiber balls or EPS foaming plastic;
the density of the light autotrophic filler is 0.1-0.3g/cm 3 The filling rate is 30-50%.
In one embodiment of the present invention, the light autotrophic filler is loaded with one or more of a sulfur-based material or an iron-based material;
the sulfur-based material is selected from one or more of sulfur, pyrite and blende;
the iron-based material is selected from one or more of siderite, reduced iron powder and iron flakes.
In one embodiment of the present invention, the light autotrophic filler is used to enhance microbial growth and provide an autotrophic denitrification electron donor material.
In one embodiment of the present invention, the dissolved oxygen concentration in the anaerobic reactor is 0.01 to 0.20mg/L, the pH is 7.0 to 8.0, and the temperature is 20 to 30 ℃.
In one embodiment of the present invention, in the aerobic reactor, the dissolved oxygen concentration is 0.8 to 2.0mg/L, the pH is 8.0 to 8.5, and the temperature is 30 to 35 ℃.
In one embodiment of the present invention, the concentration of sludge in the aerobic treatment unit is 2500-3500mg/L.
In one embodiment of the present invention, the centrifugal separation device has an effluent suspended solids content of <1000mg/L.
In one embodiment of the present invention, the concentration of dissolved oxygen in the PN-A reactor is 0.2-0.8mg/L, the pH is 8.0-8.5, and the temperature is 33-35 ℃.
In one embodiment of the present invention, the PN-A treatment unit employs PN-A granular sludge technology.
The utility model provides a high-efficient degree of depth denitrogenation technology of organic solid useless anaerobism digestion natural pond liquid of multisource, including following step:
(1) Firstly, multi-source organic solid waste to be treated and anaerobic digestion biogas slurry enter an anaerobic treatment unit to be subjected to denitrification;
(2) The effluent of the anaerobic treatment unit flows into an aerobic treatment unit to remove residual organic matters and part of suspended solids;
(3) One part of the effluent of the aerobic treatment unit is led into a suspended matter treatment unit for chemical conditioning and centrifugal separation to strengthen the removal of suspended solids, and the other part of the effluent flows back to the anaerobic treatment unit;
(4) And (3) enabling the effluent of the suspended matter treatment unit to enter A PN-A treatment unit to carry out A short-range nitrification-anaerobic ammoniA oxidation process so as to strengthen the removal of ammoniA nitrogen, enabling part of the effluent to flow back to the anaerobic treatment unit, further strengthening the removal of nitrate nitrogen, and directly discharging the rest.
In one embodiment of the present invention, in step (3), the reflux flow rate of the reflux water from the aerobic treatment unit to the anaerobic treatment unit accounts for 60-80% of the total effluent flow rate of the aerobic treatment unit;
in the 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 inflow flow rate of the multi-source organic solid waste synergistic anaerobic digestion biogas slurry to be treated, so that the removal of nitrate nitrogen is enhanced, and the total nitrogen removal rate of the whole system is improved.
In one embodiment of the present invention, in the PN-A treatment unit, A shortcut nitrification-anaerobic ammonium oxidation granular sludge process is adopted, and A composite metal magnesium salt medicament is periodically added for maintaining the stability and growth of the granular sludge.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
In the following examples, all reagents used are commercially available reagents unless otherwise specified; the detection method and means are all conventional detection methods and means in the field.
Example 1
The embodiment provides a high-efficient degree of depth denitrogenation system of organic solid useless anaerobic digestion natural pond liquid of multisource.
As shown in figure 1, the multi-source organic solid waste anaerobic digestion biogas slurry high-efficiency deep denitrification system comprises an anaerobic treatment unit 1, an aerobic treatment unit 2, A suspended matter treatment unit 3 and A PN-A treatment unit 4;
the anaerobic treatment unit 1 comprises an anaerobic reactor 11 and a first constant temperature control device 12, wherein the first constant temperature control device 12 is arranged on the outer layer of the anaerobic reactor 11;
the aerobic treatment unit 2 comprises 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, the second constant temperature control device 22 is arranged on the outer layer of the aerobic reactor 21, an aeration disc is arranged in the aerobic reactor 21 and is connected with the first aeration device 24, and the aerobic reactor 21 is also connected with the first dissolved oxygen detection electrode 23 and the first reflux device 25;
the suspended matter processing unit 3 comprises a full-automatic coagulation device 31 and a centrifugal separation device 32; the full-automatic coagulation device 31 is connected with the centrifugal separation device 32; the full-automatic coagulation device 31 is provided with a medicine adding port 311 for adding a composite metal magnesium salt medicine, and the centrifugal separation device 32 is provided with a slag discharging port 321;
the PN-A treatment unit 4 comprises 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, wherein the third constant temperature control device 42 is arranged at the outer layer of the PN-A reactor 41, an aeration disc is arranged in the PN-A reactor 41 and is connected with the second aeration device 44, and the PN-A reactor 41 is also connected with the second dissolved oxygen detection electrode 43, the pH detection electrode 46 and the second reflux device 45;
the multi-source organic solid waste anaerobic digestion biogas slurry efficient deep denitrification system is also provided with an automatic control device 5, wherein the automatic control device 5 is connected with a first aeration device 24, a second aeration device 44, a first dissolved oxygen detection electrode 23, a second dissolved oxygen detection electrode 43, a pH detection electrode 46 and an automatic pH adjusting 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 the values 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 adjusting device 6 according to negative feedback adjusting logic to make the dissolved oxygen and the pH of the system stable in a required range. The threshold value of the automatic control device 5 is set according to the condition required by the system to be controlled.
The multi-source organic solid waste and anaerobic digestion biogas slurry enter an anaerobic reactor 11 through an inlet of the anaerobic reactor 11, and an outlet of the anaerobic reactor 11 is connected with an inlet of an aerobic reactor 21; the outlet of the aerobic reactor 21 is connected with the inlet of a full-automatic coagulation device 31, and the outlet of the aerobic reactor 21 is also connected with the inlet of an anaerobic reactor 11 through a first reflux device 25; the outlet of the full-automatic coagulation device 31 is connected with the inlet of the centrifugal separation device 32, the outlet of the centrifugal separation device 32 is connected with the inlet of the PN-A reactor 41, the outlet of the PN-A reactor 41 is connected with the water outlet, and the outlet of the PN-A reactor 41 is also connected with the inlet of the anaerobic reactor 11 through A second reflux device 45.
Example 2
The embodiment provides a multi-source efficient deep denitrification process for organic solid waste anaerobic digestion biogas slurry.
As shown in FIG. 2, the efficient deep denitrification process for the multi-source organic solid waste anaerobic digestion biogas slurry comprises the following steps:
(1) Firstly, the multisource organic solid waste to be treated and anaerobic digestion biogas slurry enter an anaerobic treatment unit 1 to be subjected to denitrification;
(2) Step (1), effluent of the anaerobic treatment unit 1 flows into an aerobic treatment unit 2 to remove residual organic matters and part of suspended solids;
(3) Step (2), introducing one part of the effluent from the aerobic treatment unit 2 into a suspended matter treatment unit 3 for chemical conditioning and centrifugal separation to enhance the removal of suspended solids, and refluxing the other part of the effluent to the anaerobic treatment unit 1;
(4) And (4) allowing effluent from the suspended matter treatment unit 3 in the step (3) to enter A PN-A treatment unit 4 for A short-cut nitrification-anaerobic ammoniA oxidation process to strengthen ammoniA nitrogen removal, allowing part of the effluent to flow back to the anaerobic treatment unit 1, further strengthening nitrate nitrogen removal, and directly discharging part of the effluent.
Firstly, the multisource organic solid waste to be treated cooperates with anaerobic digestion biogas slurry to sequentially pass through an anaerobic treatment unit 1 and an aerobic treatment unit 2; then, one part of the effluent flows back to the anaerobic treatment unit 1, and the other part of the effluent is correspondingly treated by the suspended matter treatment unit 3 and the PN-A treatment unit 4 in sequence; because nitrate nitrogen is generated in A certain proportion during denitrification in the anaerobic ammoniA oxidation process, part of effluent of the PN-A treatment unit 4 flows back to the anaerobic unit to participate in the reaction again, and the denitrification effect is enhanced.
The multisource organic solid waste to be treated cooperates with the anaerobic digestion biogas slurry inlet water and two return flows to enter the anaerobic treatment unit 1 from the bottom, and the effluent overflows from the top; a novel light autotrophic filler (light sponge loaded with sulfur and siderite) is suspended in the anaerobic reactor 11, the function of the filler is to strengthen the growth of microorganisms and provide an electron donor substance for autotrophic denitrification, and the filler density is 0.2g/cm 3 And the filling rate is 40%. The dissolved oxygen of the anaerobic reactor 11 is 0.01-0.20mg/L, the pH is 7.0-8.0, and the temperature is 20-30 ℃.
The aerobic treatment unit 2 runs in an upflow mode; an aeration disc is arranged at the bottom of the reaction zone of the aerobic reactor 21, and the concentration of dissolved oxygen in the reaction zone is controlled to be 0.8mg/L-2.0mg/L by using an automatic control device 5; controlling the pH value to be 8.0-8.5 and the temperature to be 30-35 ℃; the sludge concentration in the reaction zone is controlled to be 2500-3500mg/L. In addition, effluent of a part of effluent of the unit flows back to the anaerobic treatment unit 1, the backflow flow accounts for 50% of the total effluent flow, and removal of organic matters and suspended solids in sewage is enhanced.
And A novel inorganic conditioner is added into the suspended matter treatment unit 3 to improve the solid-liquid separation effect of the sewage, and then suspended solids in the sewage are removed through centrifugal separation, so that the SS of the sewage entering the PN-A treatment unit 4 is controlled to be less than 1000mg/L. Meanwhile, the chemical conditioning process also has the function of killing microorganisms in the sewage, and the interference of the stable operation of the subsequent PN-A treatment unit 4 caused by the formation of complex florA is avoided.
The PN-A treatment unit 4 adopts A short-cut nitrification-anaerobic ammoniA oxidation granular sludge process and runs in an up-flow mode; 0.2-0.3 g/L of composite metal magnesium salt medicament is added periodically for maintaining the stability and growth of the granular sludge. In addition, an aeration disc is arranged in the PN-A reactor 41, and the concentration of dissolved oxygen in the reaction zone is controlled to be 0.1mg/L-0.3mg/L by using an automatic control device 5; and the pH of the reaction zone of the PN-A reactor 41 is controlled to 8.0 to 8.5 and the temperature is controlled to 33 to 35 ℃. The effluent part of the PN-A treatment unit 4 flows back to the anaerobic treatment unit 1, the backflow flow rate is 200-300% of the inflow flow rate of the multisource organic solid waste synergistic anaerobic digestion biogas slurry to be treated, and the purpose is to remove the residual nitrate nitrogen in the sewage and realize the deep denitrification of the sewage.
The water quality change before and after the multi-source organic solid waste anaerobic digestion biogas slurry treatment is shown in figure 3.
Example 3
The embodiment provides a multi-source efficient deep denitrification process for organic solid waste anaerobic digestion biogas slurry.
The process flow is the same as in example 2. Wherein, the process devices and the operating parameters of the anaerobic treatment unit 1, the aerobic treatment unit 2 and the suspended matter treatment unit 3 are the same as those of the embodiment 2.
The difference is that the PN-A processing unit 4 adopts A high-concentration powder carrier-granular sludge mixing technology and runs in an up-flow mode; a novel silicon-based powder carrier is added into the reaction zone of the PN-A reactor 41, the function of the novel silicon-based powder carrier is to provide A core for the formation of granular sludge and maintain high sludge concentration (more than 10000 mg/L) so as to improve the treatment efficiency. An aeration disc is arranged in the PN-A reactor 41, and the concentration of dissolved oxygen in the reaction zone is controlled to be 0.1mg/L-0.3mg/L by using an automatic control device 5; controlling the pH value of the reaction zone to be 8.0-8.5 and the temperature to be 33-35 ℃, and leading the effluent of the reaction zone to enter a sedimentation tank for mud-water separation and refluxing the sludge so as to recover the powder carrier lost from the reaction zone. The effluent part of the PN-A treatment unit 4 flows back to the anaerobic treatment unit 1, the backflow flow rate is 200-300% of the inflow flow rate of the multisource organic solid waste synergistic anaerobic digestion biogas slurry to be treated, and the purpose is to remove the residual nitrate nitrogen in the sewage and realize the deep denitrification of the sewage.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should understand that all the improvements and modifications made without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.
Claims (10)
1. A multi-source organic solid waste synergistic anaerobic digestion biogas slurry efficient deep denitrification system is characterized by comprising an anaerobic treatment unit, an aerobic treatment unit, A suspended matter treatment unit and A PN-A treatment unit;
the anaerobic treatment unit comprises 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 comprises an aerobic reactor, a first aeration device, a first dissolved oxygen detection electrode, a second constant temperature control device and a first reflux device, wherein the second constant temperature control device is arranged on the outer layer of the aerobic reactor, and 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 comprises a full-automatic coagulation device and a centrifugal separation device; the full-automatic coagulation device is connected with the centrifugal separation device;
the PN-A treatment unit comprises 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, wherein the third constant temperature control device is arranged on the outer layer of the PN-A reactor, and the PN-A reactor is connected with the second aeration device, the second dissolved oxygen detection electrode, the pH detection electrode and the second reflux device;
the multi-source organic solid waste and anaerobic digestion biogas slurry enter an anaerobic reactor through an inlet of the anaerobic reactor, and an outlet of the anaerobic reactor is connected with an inlet of an aerobic reactor; the outlet of the aerobic reactor is connected with the inlet of the full-automatic coagulation device, and the outlet of the aerobic reactor is also connected with the inlet of the anaerobic reactor through a first reflux device; the outlet of the full-automatic coagulation device is connected with the inlet of the centrifugal separation device, the outlet of the centrifugal separation device is connected with the inlet of the PN-A reactor, the outlet of the PN-A reactor is connected with the water outlet, and the outlet of the PN-A reactor is also connected with the inlet of the anaerobic reactor through A second reflux device.
2. The system of claim 1, wherein the multi-source organic solid waste and anaerobic digestion biogas slurry efficient deep denitrification system is a biogas slurry produced by mixing two or three solid wastes of kitchen waste, kitchen waste or excess sludge and treating the mixture by an anaerobic digestion system.
3. The system of claim 2, wherein the COD of the multi-source organic solid waste synergistic anaerobic digestion biogas slurry is 7000-10000mg/L, the content of ammonia nitrogen is 1500-2500mg/L, the content of total nitrogen is 4000-6000mg/L, and C/N is less than 2.
4. The system for highly efficient and deep denitrification of biogas slurry by synergistic multi-source organic solid waste and anaerobic digestion according to claim 1, characterized in that the anaerobic reactor is provided with a light autotrophic filler; the light autotrophic filler is selected from one or more of light sponge, fluffy fiber balls or EPS foaming plastic.
5. The multi-source organic solid-waste synergistic anaerobic digestion biogas slurry according to claim 4The efficient deep denitrification system is characterized in that the density of the light autotrophic filler is 0.1-0.3g/cm 3 The filling rate is 30-50%.
6. The system of claim 5, wherein the lightweight autotrophic filler is loaded with one of a sulfur-based material or an iron-based material;
the sulfur-based material is selected from one of sulfur, pyrite and blende;
the iron-based material is selected from one of siderite, reduced iron powder and iron shavings.
7. The 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, the pH is 7.0-8.0, and the temperature is 20-30 ℃.
8. The system of claim 1, wherein in the aerobic reactor, the concentration of dissolved oxygen is 0.8-2.0mg/L, the pH is 8.0-8.5, and the temperature is 30-35 ℃.
9. The multi-source efficient deep denitrification system utilizing cooperation of organic solid waste and anaerobic digestion biogas slurry as defined in claim 1, wherein the suspended solid content of the effluent of the centrifugal separation device is less than 1000mg/L.
10. The system of claim 1, wherein the concentration of dissolved oxygen in the PN-A reactor is 0.2-0.8mg/L, the pH is 8.0-8.5, and the temperature is 33-35 ℃.
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