CN112979099A - Process and device for synchronously recovering carbon and phosphorus in sewage by coupling autotrophic nitrogen removal - Google Patents
Process and device for synchronously recovering carbon and phosphorus in sewage by coupling autotrophic nitrogen removal Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
Abstract
The invention relates to the field of environmental protection and resource utilization, and particularly provides a method and a device for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal. The method comprises the following steps: transferring carbon and phosphorus in the sewage to be treated into sludge by using a flocculating agent; performing sludge-water separation on the sludge and sewage, refluxing part of sludge, and flocculating the sewage again by cooperating with a flocculating agent; the ammonia nitrogen in the sewage is converted into nitrogen and nitrate nitrogen under the action of nitrosobacteria and anaerobic ammonium oxidation bacteria. The problem of among the prior art to carbon phosphorus recovery efficiency low is solved.
Description
Technical Field
The invention relates to the field of environmental protection and resource utilization, and particularly provides a process and a device for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The shortage of water resources and the serious pollution of water bodies are one of the main factors restricting the economic and social development of China. Along with the increasingly accelerated urbanization process and industrialization development in China, the demand of people for water resources is continuously increased, and the sewage yield and the sewage treatment energy consumption are sharply increased. The traditional activated sludge method has the advantages of stable operation, high pollutant removal rate, convenient management and the like, and is widely applied to the field of domestic and foreign sewage treatment. But the treatment mode of 'energy consumption' does not have the potential of sustainable development.
With the increasing shortage of resources and energy, the low-energy-consumption sewage treatment and resource recovery process is increasingly paid attention. The sewage is an effective carrier of resource energy, a large amount of carbon, nitrogen and phosphorus substances are contained in the sewage, the carbon source in the sewage mostly exists in the form of organic carbon, the contained chemical energy is about 5 times of the energy consumption required by sewage treatment, and the realization of the recovery of the carbon source in the sewage and the resource conversion have important significance for the energy neutralization and sustainable development of the sewage treatment. Phosphorus is one of non-renewable resources, and the recovery of the phosphorus is an important way for relieving the shortage of phosphorus resources, and the realization of comprehensive recovery of phosphorus in urban domestic sewage is estimated to meet the phosphorus requirement of 15-20% of people. At present, the existing biological adsorption technology, chemical flocculation technology and the like provide possibility for low-consumption recovery of carbon and phosphorus in sewage. The nitrogen is a recyclable resource, the recovery process is complex, the operation cost and energy consumption of the conventional nitrogen recovery processes such as ion exchange, membrane separation, chemical crystallization precipitation and the like at present are far higher than those of industrial synthetic ammonia, the economic feasibility is not achieved, and how to consume low energy and denitrify in a green way is still a technical problem to be solved urgently. Therefore, the development of a treatment process capable of recovering carbon and phosphorus resources and denitrifying under low energy consumption is crucial to the sustainable development of sewage treatment.
At present, the patent literature reports that the recovery of carbon and phosphorus resources and the removal of nitrogen in sewage are realized by a magnetic separation-composite denitrification combined process. The combined process realizes the recovery of carbon and phosphorus in the sewage through a magnetic separation system, and realizes the removal of nitrogen through the combined use of a biological nitrification-denitrification technology and an anaerobic ammonia oxidation technology. However, the inventor finds that the combined process has the defects of low magnetic separation and recovery efficiency, high aeration energy consumption in the denitrification process, high carbon source consumption and the like.
Disclosure of Invention
Aiming at the problems of low carbon and phosphorus recovery efficiency, high denitrification energy consumption and the like in the prior art. In one or some embodiments of the present invention, a process for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal is provided, which comprises the following steps:
transferring carbon and phosphorus in the sewage into a sludge phase by utilizing the adsorption capacity of the sludge and the flocculation function of a flocculating agent;
performing sludge-water separation on the sludge and sewage, refluxing part of sludge, and performing flocculation adsorption on the sewage again in cooperation with a flocculating agent; the ammonia nitrogen in the sewage is converted into nitrogen and nitrate nitrogen under the action of nitrosobacteria and anaerobic ammonium oxidation bacteria.
In one or some embodiments of the invention, the device for synchronously recovering carbon and phosphorus in sewage by coupling autotrophic nitrogen removal comprises a flocculation adsorption unit, a flocculation unit and a flocculation unit, wherein the flocculation adsorption unit is used for mixing sewage, return sludge and a flocculating agent;
the inclined plate sedimentation tank comprises an inclined plate 6, and the sewage after flocculation adsorption is subjected to sludge-water separation through the inclined plate 6;
the sludge reflux section is used for refluxing part of sludge separated by the inclined plate sedimentation tank into the flocculation adsorption unit;
deamination nitrogen unit, including the short cut section of nitrifying, the short cut section of nitrifying includes nitrosobacteria biomembrane filler 7, still includes the anammox section, and the anammox section of nitrifying includes anammox bacteria biomembrane filler 8, and the swash plate sedimentation tank goes out water and is divided into two parts, lets in short cut section of nitrifying and anammox section respectively, and the short cut section of nitrifying goes out water and lets in the anammox section.
In one or some embodiments of the present invention, a process for synchronously recycling carbon and phosphorus in sewage by coupled autotrophic nitrogen removal is provided, which is performed in the above apparatus for synchronously recycling carbon and phosphorus in sewage by coupled autotrophic nitrogen removal, and comprises the following steps:
(1) and (3) introducing the sewage to be treated and a flocculating agent into a flocculation adsorption tank 3, and transferring carbon and phosphorus in the sewage into a sludge phase by utilizing the adsorption capacity of the sludge and the flocculation function of the flocculating agent.
(2) Introducing the sewage subjected to flocculation adsorption into an inclined plate sedimentation tank for sludge-water separation, refluxing part of sludge to the flocculation adsorption tank, and discharging the rest sludge out of the system;
(3) and (3) introducing the sewage obtained by separating the inclined plate sedimentation tank into a deaminizing and denitriding unit, and discharging the purified sewage out of the system.
One of the above technical solutions has the following advantages or beneficial effects:
1) according to the invention, the chemical flocculant is added to strengthen the biological adsorption process, so that the recovery effect of activated sludge on the carbon source in the sewage can be strengthened, meanwhile, the chemical flocculant can realize chemical removal of phosphorus in the sewage through flocculation and precipitation, the phosphorus is enriched in the sludge, resource recovery is realized through recovery of the sludge rich in carbon and phosphorus, and the removal effect on various pollutants is better. The nitrogen in the sewage can be removed by an autotrophic nitrogen removal mode with low energy consumption and low sludge yield through a shortcut nitrification-anaerobic ammonia oxidation process. The invention treats the sludge and the sewage respectively, and the sludge can be subsequently fermented to generate methane, thereby realizing the complete recovery treatment of the sewage and the sludge.
2) The invention can realize the high-efficiency recovery of carbon and phosphorus in sewage with lower energy consumption, and the flocculation adsorption tank simultaneously utilizes the adsorption effect of activated sludge and the flocculation effect of a chemical flocculant to capture and recover carbon and phosphorus. The aeration energy consumption is low, and the recovery effect is good; the obtained carbon-and phosphorus-rich excess sludge is subjected to anaerobic fermentation to produce methane, so that the energy recovery in the sewage is realized. The low carbon-nitrogen ratio sewage after recovery of the carbon source and the phosphorus can be removed by a short-cut nitrification-anaerobic ammonia oxidation process, and compared with the traditional nitrification and denitrification nitrogen removal mode, the process has the advantages of low aeration energy consumption, low carbon source demand and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of a method for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal in embodiment 1 of the present invention.
Wherein, 1, the urban sewage raw water tank; 2. a flocculant dosing tank; 3. a flocculation adsorption tank; 4. a sloping plate sedimentation tank; 5. a shortcut nitrification-anaerobic ammonia oxidation tank; 6. a sloping plate; 7. nitrosobacteria biofilm filler; 8. anaerobic ammonium oxidation bacteria biofilm filler; 9. an aeration pump; 10. a flow meter; 11. a flocculation adsorption tank water inlet pump; 12. a flocculant dosing pump; 13. a water inlet pump of the inclined plate sedimentation tank; 14. a short-cut nitrification section water inlet pump; 15. a water inlet pump of the anaerobic ammonia oxidation section; 16. a water outlet pump of the system; 17. a sludge reflux pump; 18. a sludge discharge pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the problems that the high-load activated sludge method in the prior art has low carbon source recovery efficiency and hardly has effect on removing/recovering nitrogen and phosphorus, and the like.
In one or some embodiments of the present invention, a process for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal is provided, which comprises the following steps:
transferring carbon and phosphorus in the sewage into the sludge by utilizing the adsorption capacity of the sludge and the flocculation function of a flocculating agent;
sludge and sewage are subjected to mud-water separation, and part of sludge is refluxed and is flocculated by cooperating with a flocculating agent; the ammonia nitrogen in the sewage is converted into nitrogen and nitrate nitrogen under the action of nitrosobacteria and anaerobic ammonium oxidation bacteria.
The process for synchronously recovering carbon and phosphorus in sewage by coupling autotrophic nitrogen removal mainly adopts a coupling process of chemically enhanced bioadsorption-shortcut nitrification anaerobic ammonia oxidation. The process can efficiently capture carbon and phosphorus resources in the sewage under low energy consumption, and realize the recovery of the carbon and the phosphorus in the form of excess sludge. The nitrogen is biologically removed through the short-cut nitrification-anaerobic ammonia oxidation process, and the sewage can reach the standard.
Specifically, on one hand, the invention transfers the pollutants such as carbon, phosphorus and the like into the sludge phase by utilizing the biological adsorption of the activated sludge and the strong flocculation of the flocculating agent, so that the ammonia nitrogen pollutants and the carbon and phosphorus pollutants are respectively treated.
According to the second aspect of the invention, nitrite bacteria and anaerobic ammonium oxidation bacteria are utilized to convert ammonia nitrogen pollutants in sewage into pollution-free nitrogen and generate a small amount of nitrate ammonia in two steps, and carbon and phosphorus pollutants in the sewage are removed in a flocculation adsorption tank, so that the sewage after biological treatment can be directly discharged.
Preferably, the flocculant is a chemical flocculant, preferably an iron-containing flocculant, further preferably one or a mixture of ferric chloride and ferrous sulfate, and further preferably ferric chloride; the iron agent has better effect on the flocculation precipitation of carbon and phosphorus in the sewage.
Carrying out aeration treatment on the sewage in the flocculation adsorption process, providing oxygen for the biological adsorption process, and simultaneously realizing the full mixing of the sewage, the sludge and the flocculating agent;
or, the method also comprises a sludge fermentation step, wherein the recovered sludge is subjected to anaerobic fermentation to generate methane, so that the energy recovery in the sewage is realized.
Preferably, the ammonia nitrogen removal process in the sewage comprises a partial nitrification section and an anaerobic ammonia oxidation section;
wherein, in the short-cut nitrification section, ammonia nitrogen in the sewage is converted into nitrite nitrogen under the action of nitrite bacteria;
in the anaerobic ammonia oxidation section, nitrite ammonia and ammonia nitrogen are converted into nitrogen and nitrate nitrogen under the action of anaerobic ammonia oxidizing bacteria.
The invention adopts a two-step method to treat ammonia nitrogen, anaerobic ammonia oxidation bacteria use nitrite nitrogen as an electron acceptor, ammonia nitrogen as an electron donor to generate a large amount of nitrogen and a small amount of nitrate, thereby realizing autotrophic removal of nitrogen in sewage. In the invention, part of the effluent of the inclined plate sedimentation tank enters a short-cut nitrification section, and ammonia nitrogen in the sewage is converted into nitrite nitrogen under the action of nitrite bacteria; and the effluent rich in nitrite nitrogen in the shortcut nitrification section and the effluent of the sedimentation tank rich in ammonia nitrogen enter the anaerobic ammonia oxidation section together, and the nitrite nitrogen reacts with the ammonia nitrogen to generate nitrogen under the action of anaerobic ammonia oxidizing bacteria, so that the nitrogen in the sewage is removed.
In one or more embodiments of the invention, a device for synchronously recovering carbon and phosphorus in sewage by coupling autotrophic nitrogen removal is provided, which comprises a flocculation adsorption unit, a flocculation unit and a control unit, wherein the flocculation adsorption unit is a container with a certain volume and is used for mixing sewage, return sludge and a flocculating agent;
the inclined plate sedimentation tank 4 comprises an inclined plate 6, and the flocculated sewage is subjected to sludge-water separation by the inclined plate 6;
the sludge reflux section is used for refluxing part of sludge separated by the inclined plate sedimentation tank 4 into the flocculation adsorption unit;
deamination nitrogen unit, including the short cut section of nitrifying, the short cut section of nitrifying includes nitrosobacteria biomembrane filler 7, still includes the anammox section, and the anammox section of nitrifying includes anammox bacteria biomembrane filler 8, and 4 play waters in the inclined plate sedimentation tank are divided into two parts, let in short cut section of nitrifying and anammox section respectively, and the short cut section of nitrifying goes out water and lets in the anammox section.
Preferably, the flocculation adsorption unit comprises a flocculation adsorption tank 3, a sludge backflow inlet is arranged below the flocculation adsorption tank 3,
an aeration device is arranged in the flocculation adsorption tank 3;
preferably, the flocculation adsorption tank 3 adopts a corner-less structure to reduce an internal dead water area, and further preferably adopts a cylindrical structure.
Preferably, the inclined plate sedimentation tank 4 is an upflow type counter-current inclined plate sedimentation tank;
preferably, the inclined plate sedimentation tank 4 adopts a perforated overflow pipe to discharge water;
preferably, an inclined plate forming an angle of 30-70 degrees with the horizontal plane is arranged in the inclined plate sedimentation tank 4, further preferably forming an angle of 60 degrees, a sludge area is formed below the inclined plate, and a clear water area is formed above the inclined plate;
preferably, the bottom of the inclined plate sedimentation tank 4 is a cone to form a sludge collecting hopper, and the inclination angle of the side wall of the sludge collecting hopper is 30-70 degrees, and further preferably 60 degrees.
Preferably, the deammoniation unit is a shortcut nitrification-anaerobic ammonia oxidation tank and comprises a shortcut nitrification section and an anaerobic ammonia oxidation section, wherein the shortcut nitrification section comprises a nitrosobacteria biofilm filler 7, and the anaerobic ammonia oxidation section comprises an anaerobic ammonia oxidation bacteria biofilm filler 8;
preferably, the anaerobic ammonia oxidation tank is of a square structure;
or, the short-cut nitrification-anaerobic ammonia oxidation tank is filled with nitrosobacteria biofilm filler 7 in front and anaerobic ammonia oxidation bacteria biofilm filler 8 in back according to the flow direction of sewage.
In one or some embodiments of the present invention, a process for synchronously recycling carbon and phosphorus in sewage by coupled autotrophic nitrogen removal is provided, which is performed in the above apparatus for synchronously recycling carbon and phosphorus in sewage by coupled autotrophic nitrogen removal, and comprises the following steps:
(1) introducing the sewage to be treated and a flocculating agent into a flocculation adsorption tank 3,
the carbon and phosphorus in the sewage are transferred to the sludge phase by utilizing the adsorption capacity of the sludge and the flocculation function of the flocculant. (2) Introducing the sewage after flocculation adsorption into an inclined plate sedimentation tank 4 for mud-water separation, refluxing part of sludge to a flocculation adsorption tank 3, and discharging the rest sludge out of the system;
(3) and (3) introducing the sewage separated by the inclined plate sedimentation tank 4 into a deaminizing nitrogen unit, and discharging the purified sewage out of the system.
Preferably, the flocculation adsorption tank 3 adopts a continuous aeration mode.
Preferably, the sludge concentration of the flocculation adsorption tank 3 is 2000-3000mg/L, the dissolved oxygen concentration is 0.5-1.0mg/L, the hydraulic retention time is 30-60min, and the sludge retention time is 0.5-2d, so that adsorption and proliferation conditions are provided for the activated sludge under high-load operation.
Preferably, the concentration of the flocculating agent added into the flocculation adsorption tank 3 is 10-20 mg/L.
Preferably, the inclined plate sedimentation tank 4 adopts a perforated overflow pipe to output water, and the hydraulic retention time is 60-90 min.
Preferably, the filling ratio of the filler for the biofilm of the nitrosobacteria is 50-80 percent. The dissolved oxygen of the short-cut nitrification section is maintained at 0.5-2.0mg/L, and the pH value is maintained at 7.9-8.2.
Preferably, the anaerobic ammonia oxidation section is added with anaerobic ammonia oxidation bacteria biomembrane filler with the filling ratio of 50-80%;
preferably, the anammox zone is maintained under strictly anaerobic conditions and the pH is maintained at 7.5 to 8.5, more preferably 8.0.
Example 1:
the embodiment provides a process for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal, which uses a device shown in figure 1 to treat domestic sewage of a certain campus in the north,
the method comprises the following steps: (1) the sewage to be treated and the flocculating agent are introduced into a flocculation adsorption tank 3, and the activated sludge rapidly captures the carbon source in the sewage and transfers the carbon source into the sludge under the reinforcement of the chemical flocculating agent. In addition, the flocculant is capable of chemically flocculating settling phosphorus in the wastewater to transfer phosphorus from the wastewater phase to the sludge phase.
(2) Introducing the effluent of the flocculation adsorption tank 3 into an inclined plate sedimentation tank 4 for sludge-water separation to realize the recovery of carbon source and phosphorus in the sewage, refluxing part of sludge to the flocculation adsorption tank to maintain the stable operation of the flocculation adsorption tank, and discharging the supernatant through an overflow pipe;
(3) and (3) introducing the effluent of the inclined plate sedimentation tank 4 into a shortcut nitrification section and an anaerobic ammonia oxidation section of the shortcut nitrification-anaerobic ammonia oxidation tank respectively. In the short-cut nitrification section, ammonia nitrogen in the sewage is converted into nitrite nitrogen under the action of nitrite bacteria. Nitrite nitrogen in the short-cut nitrification effluent and ammonia nitrogen in the effluent of the inclined plate sedimentation tank 4 are converted into nitrogen and nitrate nitrogen under the action of anaerobic ammonia oxidizing bacteria, so that the nitrogen in the sewage is removed.
(4) The effluent of the shortcut nitrification-anaerobic ammonia oxidation tank is discharged out of the system through a water outlet pump.
Wherein, the flocculating agent is selected to be ferric chloride, the concentration of the flocculating agent in the flocculation adsorption tank is maintained at 15-20mg/L, the concentration of dissolved oxygen in the flocculation adsorption tank is 0.5-1mg/L, the concentration of sludge is 3000mg/L, the hydraulic retention time is 60min, the sludge retention time is 2d, and the sludge reflux ratio is 100%. And (2) after passing through the flocculation adsorption tank, the sewage enters an inclined plate sedimentation tank 4 for solid-liquid separation, the hydraulic retention time of the inclined plate sedimentation tank 4 is 90min, the effluent of the inclined plate sedimentation tank 4 respectively enters a short-cut nitrification section and an anaerobic ammonia oxidation section through a water inlet pump, nitrosobacteria and anaerobic ammonia oxidation bacteria biofilm fillers are respectively added into the short-cut nitrification section and the anaerobic ammonia oxidation section, and the filling ratio is 75%. The concentration of dissolved oxygen in the short-cut nitrification section is 0.8-1.2mg/L, the pH value is 7.9-8.2, and the hydraulic retention time is 6 h. The anaerobic ammonia oxidation section maintains strict anaerobic conditions, the pH value is maintained to be about 8.0, and the hydraulic retention time is 2 hours.
Through detection, the inlet water COD concentration of the process system is 260-300mg/L, the total nitrogen concentration is 25-30mg/L, the ammonia nitrogen concentration is 22-27mg/L, and the total phosphorus concentration is 2.5-3.5 mg/L. The COD of the effluent of the inclined plate sedimentation tank 4 is 70-90mg/L, the total nitrogen concentration is 20-30mg/L, the ammonia nitrogen concentration is 20-25mg/L, and the total phosphorus concentration is 0.4-0.6 mg/L. By accounting, 65% of carbon source and more than 80% of phosphorus can be recovered by the flocculation adsorption tank. The COD concentration of the final effluent of the short-cut nitrification-anaerobic ammonia oxidation tank is less than 35mg/L, the total nitrogen concentration is less than 8mg/L, and the total phosphorus concentration is less than 0.5 mg/L.
Example 2:
adopt the device in embodiment 1 to handle certain campus domestic sewage in north:
wherein, the flocculating agent is selected to be ferric chloride, the concentration of the flocculating agent in the flocculation adsorption tank is maintained at 10-15mg/L, the concentration of dissolved oxygen in the flocculation adsorption tank is 0.5-1mg/L, the concentration of sludge is 2500mg/L, the hydraulic retention time is 45min, the sludge retention time is 1.5d, and the sludge reflux ratio is 80%. And (2) after passing through the flocculation adsorption tank, the sewage enters an inclined plate sedimentation tank 4 for solid-liquid separation, the hydraulic retention time of the inclined plate sedimentation tank 4 is 90min, the effluent of the inclined plate sedimentation tank 4 respectively enters a short-cut nitrification section and an anaerobic ammonia oxidation section through a water inlet pump, nitrosobacteria and anaerobic ammonia oxidation bacteria biofilm fillers are respectively added into the short-cut nitrification section and the anaerobic ammonia oxidation section, and the filling ratio is 75%. The concentration of dissolved oxygen in the short-cut nitrification section is 0.8-1.2mg/L, the pH value is 7.9-8.2, and the hydraulic retention time is 6 h. The anaerobic ammonia oxidation section maintains strict anaerobic conditions, the pH value is maintained to be about 8.0, and the hydraulic retention time is 2 hours.
Through detection, the inlet water COD concentration of the process system is 230-260mg/L, the total nitrogen concentration is 20-25mg/L, the ammonia nitrogen concentration is 18-24mg/L, and the total phosphorus concentration is 2-3 mg/L. The COD of the effluent of the inclined plate sedimentation tank 4 is 70-90mg/L, the total nitrogen concentration is 17-22mg/L, the ammonia nitrogen concentration is 15-20mg/L, and the total phosphorus concentration is 0.4-0.6 mg/L. By accounting, the flocculation adsorption tank can recover 60 percent of carbon source and more than 80 percent of phosphorus. The COD concentration of the final effluent of the short-cut nitrification-anaerobic ammonia oxidation tank is less than 40mg/L, the total nitrogen concentration is less than 8mg/L, and the total phosphorus concentration is less than 0.5 mg/L.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A process for synchronously recovering carbon and phosphorus in sewage by coupling autotrophic nitrogen removal is characterized by comprising the following steps:
transferring carbon and phosphorus in the sewage into a sludge phase by utilizing the adsorption capacity of the sludge and the flocculation function of a flocculating agent;
performing sludge-water separation on the sludge and sewage, refluxing part of sludge, and flocculating the sludge and the sewage again by cooperating with a flocculating agent; the ammonia nitrogen in the sewage is converted into nitrogen and nitrate nitrogen under the action of nitrosobacteria and anaerobic ammonium oxidation bacteria.
2. The process for synchronously recycling carbon and phosphorus in sewage through coupled autotrophic nitrogen removal according to claim 1, wherein the flocculant is a chemical flocculant, preferably an iron-containing flocculant, further preferably one or a mixture of ferric chloride and ferrous sulfate, further preferably ferric chloride;
carrying out aeration treatment on the sewage in the flocculation adsorption process;
or, the method also comprises a sludge fermentation step, wherein the recovered sludge is subjected to anaerobic fermentation to generate methane.
3. The process for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal according to claim 1, wherein the process for converting ammonia nitrogen in sewage into nitrogen and nitrate nitrogen comprises a partial nitrification section and an anaerobic ammonia oxidation section;
wherein, in the short-cut nitrification section, ammonia nitrogen in the sewage is converted into nitrite nitrogen under the action of nitrite bacteria;
in the anaerobic ammonia oxidation section, nitrite ammonia and ammonia nitrogen are converted into nitrogen and nitrate nitrogen under the action of anaerobic ammonia oxidizing bacteria.
4. A device for synchronously recovering carbon and phosphorus in sewage by coupling autotrophic denitrification is characterized by comprising a flocculation adsorption unit, a flocculation unit and a denitrification unit, wherein the flocculation adsorption unit is used for mixing sewage, return sludge and a flocculating agent;
the inclined plate sedimentation tank (4) comprises an inclined plate (6), and the sewage after flocculation adsorption is subjected to sludge-water separation through the inclined plate (6);
a sludge reflux section, wherein part of sludge separated by the inclined plate sedimentation tank (4) is refluxed into the flocculation adsorption unit;
the deamination nitrogen unit is a shortcut nitrification-anaerobic ammonia oxidation tank, and comprises a shortcut nitrification section and an anaerobic ammonia oxidation section, wherein the shortcut nitrification section comprises a nitrosobacteria biofilm filler (7) and an anaerobic ammonia oxidation section, the anaerobic ammonia oxidation section comprises an anaerobic ammonia oxidation bacteria biofilm filler (8), the effluent of the inclined plate sedimentation tank (4) is divided into two parts, the shortcut nitrification section and the anaerobic ammonia oxidation section are respectively introduced, and the effluent of the shortcut nitrification section is introduced into the anaerobic ammonia oxidation section.
5. The device for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal according to claim 4, wherein the flocculation adsorption unit comprises a flocculation adsorption tank (3), a sludge return inlet is arranged below the flocculation adsorption tank (3),
an aeration device is arranged in the flocculation adsorption tank (3);
preferably, the flocculation adsorption tank (3) adopts a corner-less structure to reduce an internal dead water area, and further preferably adopts a cylindrical structure.
6. The device for synchronously recycling carbon and phosphorus in sewage through coupled autotrophic nitrogen removal according to claim 4, wherein the inclined plate sedimentation tank (4) is an upflow and counter-current inclined plate sedimentation tank (4);
preferably, the inclined plate sedimentation tank (4) adopts a perforated overflow pipe to discharge water;
preferably, an inclined plate forming an angle of 30-70 degrees with the horizontal plane is arranged in the inclined plate sedimentation tank (4), more preferably an angle of 60 degrees, a sludge area is formed below the inclined plate, and a clear water area is formed above the inclined plate;
preferably, the bottom of the inclined plate sedimentation tank (4) is a cone to form a sludge collecting hopper, and the inclination angle of the side wall of the sludge collecting hopper is 30-70 degrees, and further preferably 60 degrees.
7. The device for synchronously recycling carbon-phosphorus coupled autotrophic nitrogen removal in sewage according to claim 4, wherein the ammonia nitrogen removal unit comprises a shortcut nitrification tank and an anaerobic ammonia oxidation tank, the shortcut nitrification tank comprises nitrosobacteria biofilm fillers (7), and the anaerobic ammonia oxidation tank comprises anaerobic ammonia oxidation bacteria biofilm fillers (8);
preferably, the anaerobic ammonia oxidation tank is of a square structure;
or, the method comprises a shortcut nitrification-anaerobic ammonia oxidation tank, wherein nitrite bacteria biomembrane filler (7) is filled in front of the shortcut nitrification-anaerobic ammonia oxidation tank and anaerobic ammonia oxidation bacteria biomembrane filler (8) is filled in the rear of the shortcut nitrification-anaerobic ammonia oxidation tank according to the flowing direction of sewage.
8. A process for synchronously recycling carbon and phosphorus coupled autotrophic nitrogen removal in sewage, which is carried out in the device for synchronously recycling carbon and phosphorus coupled autotrophic nitrogen removal in sewage according to any one of claims 4 to 7, comprises the following steps:
(1) introducing sewage to be treated and a flocculating agent into a flocculation adsorption tank (3), transferring carbon and phosphorus in the sewage into a sludge phase by utilizing the adsorption capacity of sludge and the flocculation function of the flocculating agent (2), introducing the sewage subjected to flocculation adsorption into an inclined plate sedimentation tank for sludge-water separation, refluxing part of sludge to the flocculation adsorption tank, and discharging the rest sludge out of the system;
(3) and (3) introducing the sewage obtained by separating the inclined plate sedimentation tank into a deaminizing and denitriding unit, and discharging the purified sewage out of the system.
9. The process for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal according to claim 7, wherein the flocculation adsorption tank (3) adopts a continuous aeration mode;
preferably, the sludge concentration of the flocculation adsorption tank is 2000-3000 mg/L;
preferably, the concentration of dissolved oxygen is 0.5-1.0mg/L, and the hydraulic retention time is 30-60 min;
preferably, the sludge retention time is 0.5-2 d;
preferably, the concentration of the flocculating agent added into the flocculation adsorption tank is 10-20 mg/L.
10. The process for synchronously recycling carbon and phosphorus in sewage by coupling autotrophic nitrogen removal according to claim 7, wherein the inclined plate sedimentation tank (4) adopts a perforated overflow pipe to output water, and the hydraulic retention time is 60-90 min.
Preferably, nitrite bacteria biofilm filler (7) is added in the short-cut nitrification section, and the filling ratio is 50-80%;
preferably, the dissolved oxygen of the short-cut nitrification section is maintained at 0.5-2.0mg/L,
preferably, the pH of the short-cut nitrification section is maintained between 7.9 and 8.2;
preferably, the anaerobic ammonia oxidation section is added with anaerobic ammonia oxidation bacteria biomembrane filler with the filling ratio of 50-80%;
preferably, the anammox zone is maintained under strictly anaerobic conditions and the pH is maintained at 7.5 to 8.5, more preferably 8.0.
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