CN113620525A - Integrated device suitable for low carbon nitrogen ratio domestic sewage treatment - Google Patents
Integrated device suitable for low carbon nitrogen ratio domestic sewage treatment Download PDFInfo
- Publication number
- CN113620525A CN113620525A CN202110936799.5A CN202110936799A CN113620525A CN 113620525 A CN113620525 A CN 113620525A CN 202110936799 A CN202110936799 A CN 202110936799A CN 113620525 A CN113620525 A CN 113620525A
- Authority
- CN
- China
- Prior art keywords
- tank
- nitrogen
- anaerobic
- sewage
- biological
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
-
- 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
-
- 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
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Abstract
The invention discloses an integrated device suitable for treating low-carbon-nitrogen-ratio domestic sewage, which comprises an anaerobic tank, an anoxic tank, an aerobic tank, a sludge sedimentation tank and a biological aerated filter which are sequentially communicated; a nitrite nitrogen return pipeline is arranged between the anaerobic tank and the aerobic tank; a nitrate nitrogen return pipeline is arranged between the anoxic tank and the biological aerated filter. The sewage to be treated sequentially enters an anaerobic tank for anaerobic ammoxidation reaction, enters an anoxic tank for denitrification reaction, enters an aerobic tank for incomplete nitration reaction, enters a sludge sedimentation tank for sludge sedimentation and finally enters an aeration biological filter for complete nitration reaction. According to the invention, two groups of nitrifying liquid are arranged to flow back in a cross way, wherein nitrite nitrogen flows back to the anaerobic tank to participate in anaerobic ammonia oxidation, denitrification is carried out under the condition of reducing carbon source consumption, nitrate nitrogen flows back to the anoxic tank to participate in denitrification, the nitrogen content of sewage is further reduced, and the nitrifying liquid is suitable for treating low-carbon-nitrogen-ratio domestic sewage, the treatment efficiency of the domestic sewage is improved, and the sewage is ensured to be discharged up to the standard.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an integrated device suitable for low-carbon-nitrogen-ratio domestic sewage treatment.
Background
The domestic sewage is the waste water discharged in the daily life process of residents, mainly comes from kitchen sewage, domestic washing sewage, toilet sewage and other mixed sewage, and the like, and contains pollutants such as COD, nitrogen, phosphorus, suspended matters, pathogenic bacteria and the like, and organic matters in the sewage are extremely unstable and are easy to decay to generate stink. Bacteria and pathogens multiply in large quantities by taking organic matters in domestic sewage as nutrients, so that infectious diseases are spread. Therefore, domestic sewage must be treated before being discharged.
In recent years, with the continuous improvement of the rural living standard in China, the daily water consumption per capita and the domestic sewage discharge amount are increased rapidly, and the proportion of the rural domestic sewage in the sewage discharge field is increased gradually. And because the protein concentration in the wastewater is continuously increased, the concentration indexes of pollutants such as ammonia nitrogen, total nitrogen and the like in the wastewater are higher, and the rural domestic sewage is directly discharged and disorderly discharged seriously, so that the rural domestic sewage problem is continuously upgraded. At present, rural domestic sewage becomes a great pollution source of nutrient elements such as nitrogen, phosphorus and the like, and the problem of improving the removal rate of nitrogen in the domestic sewage is a problem which is urgently needed to be solved at present.
Under normal conditions, the CODcr concentration in the domestic sewage in north is more 350-500 mg/L,BOD5150-250 mg/L, SS 200-300 mg/L, TN 20-85 mg/L, and TP 4-15 mg/L. However, in recent years, the water quality of the sewage is found to have changed obviously when the current situation of sewage discharge in rural areas in the north of China is investigated. The CODcr concentration is further reduced, TN and ammonia nitrogen are further improved, the carbon nitrogen ratio (COD/TN) is between 2 and 4, and even some areas are reduced to below 1. The carbon-nitrogen ratio of the wastewater is disordered, so that the total nitrogen of the wastewater cannot reach the discharge standard, and the discharge of domestic sewage is severely restricted.
The traditional denitrification technology forms mature process methods such as an A/O process, an oxidation ditch process, an SBR process and the like, but the methods are all based on sufficient carbon sources. Aiming at the current pollution condition of carbon-nitrogen ratio imbalance, the traditional biological denitrification process with high energy consumption and high cost cannot achieve ideal effect. Therefore, research on a denitrification process with low energy consumption and high efficiency has become a hotspot in the field of sewage treatment at present.
Aiming at the treatment difficulty of the domestic sewage with the low carbon-nitrogen ratio, the invention develops an integrated device suitable for treating the domestic sewage with the low carbon-nitrogen ratio aiming at the defects of the prior art, improves the treatment efficiency of the domestic sewage and ensures that the sewage is discharged up to the standard.
Disclosure of Invention
The invention mainly aims to solve the defects in the prior art and provide an integrated device suitable for treating domestic sewage with a low carbon-nitrogen ratio.
The purpose of the invention is realized by the following technical scheme:
an integrated device suitable for treating low-carbon-nitrogen-ratio domestic sewage comprises an anaerobic tank, an anoxic tank, an aerobic tank, a sludge sedimentation tank and a biological aerated filter which are sequentially communicated in the sewage flow direction; a nitrite nitrogen return pipeline is arranged between the anaerobic tank and the aerobic tank, and a nitrate nitrogen return pipeline is arranged between the anoxic tank and the biological aerated filter;
a biological membrane carrier is arranged in the anaerobic tank, and anaerobic ammonia oxidizing bacteria and ammonifying bacteria are loaded on the biological membrane carrier; the anaerobic tank is used for enabling part of organic nitrogen in the sewage to carry out ammoniation reaction under the action of the ammoniation bacteria to generate ammonia nitrogen, and is used for enabling the ammonia nitrogen in the sewage and nitrite nitrogen and nitrate nitrogen which flow back from the aerobic tank to carry out anaerobic ammonia oxidation reaction under the action of the anaerobic ammonia oxidation bacteria to generate nitrogen gas so as to remove part of the organic nitrogen, the ammonia nitrogen, the nitrite nitrogen and the nitrate nitrogen in the sewage;
denitrifying bacteria are arranged in the anoxic pond; the anoxic tank is used for enabling the sewage treated by the anaerobic tank and the nitrate nitrogen refluxed by the biological aerated filter to perform denitrification reaction under the action of the denitrifying bacteria to generate nitrogen so as to remove the nitrate nitrogen in the sewage and part of organic matters for supplying energy to the denitrifying bacteria;
suspended biological fillers, an aeration device and an oxygen dissolving instrument are arranged in the aerobic tank and the aeration biological filter tank, the filling amount of the suspended biological fillers in the aerobic tank and the aeration biological filter tank is 10-30% and 30-50% respectively, nitrifying bacteria are filled in the suspended biological fillers, and dominant nitrifying bacteria in the aerobic tank and the aeration biological filter tank are nitrite bacteria and nitrate bacteria respectively; the volume ratio of the anaerobic tank to the anoxic tank to the aerobic tank is (1-2) to (1-2-3); the working conditions of the aerobic tank are set as follows: the dissolved oxygen is set to be 0.5-1 mg/L, and the hydraulic retention time is controlled to be 8-16 h; the working conditions of the biological aerated filter are as follows: the dissolved oxygen is 2-4 mg/L, and the hydraulic retention time is 2-4 h;
the aerobic tank is used for enabling part of ammonia nitrogen contained in the sewage treated by the anoxic tank to perform incomplete nitration reaction under the action of the nitrifying bacteria and limited working conditions to generate a large amount of nitrite nitrogen and a small amount of nitrate nitrogen so as to remove part of organic matters and ammonia nitrogen in the sewage;
the sludge sedimentation tank is used for carrying out sludge sedimentation on the sewage treated by the aerobic tank;
and the biological aerated filter is used for leading the sewage treated by the sludge sedimentation tank to carry out thorough nitration reaction under the limited working condition to generate nitrate nitrogen so as to remove residual nitrogen elements and residual organic matters in the sewage.
Preferably, the biomembrane carrier comprises a central framework and fiber yarns which are positioned on the framework and do not radiate outwards regularly, and the fiber yarns are formed by spirally weaving polyacrylonitrile or polyester fibers.
Further preferably, the biofilm carriers are suspended in the anaerobic tank.
Preferably, a stirring device is arranged in the anoxic tank.
Preferably, the suspended biological filler is a hollow double-layer net-shaped sphere.
Preferably, a dosing device is arranged on the sludge settling tank and used for adding a settling agent into the sludge settling tank.
Preferably, the precipitation medicament is a composite aluminum-iron medicament.
Preferably, the dissolved oxygen in the anaerobic tank is less than 0.2mg/L, and the dissolved oxygen in the anoxic tank is less than 0.5 mg/L.
Preferably, the hydraulic retention time of the anaerobic pool is 4-8 hours, and the hydraulic retention time of the anoxic pool is 4-6 hours.
Preferably, the reflux ratio of the aerobic tank is 200-500%, and the reflux ratio of the biological aerated filter is 100-300%.
According to the invention, two groups of nitrifying liquid are arranged to flow back in a cross way, wherein nitrite nitrogen flows back to the anaerobic tank to participate in anaerobic ammonia oxidation, nitrogen removal is carried out under the condition of reducing carbon source consumption, nitrate nitrogen flows back to the anoxic tank to participate in denitrification and phosphorus removal, the nitrogen content of sewage is further reduced, and the nitrifying liquid is suitable for low-carbon-nitrogen-ratio domestic sewage treatment, the domestic sewage treatment efficiency is improved, and the sewage is ensured to be discharged after reaching the standard.
Drawings
The implementation, functional features and advantages of the objects of the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of an integrated apparatus for treating domestic sewage with low carbon-nitrogen ratio, provided by the invention;
FIG. 2 is a schematic diagram of the structure of the suspended biological filler of FIG. 1.
Wherein, 101-anaerobic tank, 102-biomembrane carrier, 103-anoxic tank, 104-aerobic tank, 105-suspended biological filler, 106-sludge sedimentation tank, 107-dosing device, 108-aeration biological filter, 109-nitrite nitrogen return pipeline, 110-nitrate nitrogen return pipeline, 111-aeration device, 112-stirring device, 201-water inlet, 202-water outlet and 203-sludge.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1, the integrated device for treating low carbon-nitrogen ratio domestic sewage provided by the invention comprises an anaerobic tank 101, an anoxic tank 103, an aerobic tank 104, a sludge sedimentation tank 106 and a biological aerated filter 108 which are sequentially communicated in the sewage flow direction;
a biofilm carrier 102 is arranged in the anaerobic tank 101, anaerobic ammonia oxidizing bacteria and ammonifying bacteria are loaded on the biofilm carrier 102, and a nitrite nitrogen return pipeline 109 is arranged between the anaerobic tank 101 and the aerobic tank 104;
denitrifying bacteria are arranged in the anoxic tank 103, and a nitrate nitrogen return pipeline 110 is arranged between the anoxic tank 103 and the biological aerated filter 108;
the aerobic tank 104 and the aeration biological filter 108 are respectively provided with suspended biological filler 105, an aeration device 111 and an oxygen dissolving instrument, and the filling amount of the suspended biological filler in the aerobic tank and the aeration biological filter is respectively 10-30% and 30-50% (taking the volume of the tank body as a reference); nitrifying bacteria are filled in the suspended biological filler 105, wherein nitrite bacteria in the aerobic tank are dominant nitrifying bacteria; in the aeration biological filter, nitrate bacteria are dominant nitrobacteria; the aerobic tank and the biological aerated filter are internally provided with suspended fillers, because the suspended fillers can move relatively along with water in the tank body, the flexibility is good, the contact between water pollutants and the fillers is increased, and the utilization rate of the fillers and the sewage treatment efficiency are improved; the fixed filler can be contacted with pollutants in the water body only when the water body flows through the position where the filler is fixed, so that the flexibility and the adjustability are poor;
the volume ratio of the anaerobic tank to the anoxic tank to the aerobic tank is (1-2): 1 (2-3), the volume ratio is determined according to the water quality of inlet and outlet water, and as the carbon-nitrogen ratio of inlet water is low and the time required by denitrification is short, the tank volume required by the anoxic tank is small, the anaerobism is positioned at the front end, the inlet water concentration is high, the anaerobic ammonia oxidation reaction rate is low, the set volume of the anaerobic tank is large, and the total nitrogen removal effect is improved;
the working conditions of the aerobic tank are as follows: setting the dissolved oxygen to be 0.5-1 mg/L, and controlling the hydraulic retention time to be 8-16 h; the working conditions of the biological aerated filter are as follows: the dissolved oxygen is 2-4 mg/L, the hydraulic retention time is 2-4 h, and the aeration quantity of the aerobic tank and the aeration biological filter is adjusted according to the actual inflow water quality.
The COD and BOD content of the domestic sewage with low carbon-nitrogen ratio to be treated is higher, the sewage contains a large amount of organic substances (mainly organic carbon), ammonia nitrogen and phosphorus, and the carbon-nitrogen ratio is lower, and the conventional sewage treatment method has poor treatment effect due to insufficient carbon source.
After pretreatment of domestic sewage with low carbon-nitrogen ratio to be treated, the sewage is treated by adopting the device shown in figure 1, the sewage firstly enters an anaerobic tank, under the anaerobic condition, part of organic nitrogen in the sewage is subjected to ammoniation reaction under the action of ammoniation bacteria to generate ammonia nitrogen, and the ammonia oxidation bacteria are subjected to ammonia nitrogen oxidation reaction by using CO2As a carbon source, ammonia nitrogen contained in the sewage and ammonia nitrogen generated by the ammoniation reaction of organic nitrogen are taken as electron donors, rich nitrite nitrogen and nitrate nitrogen contained in nitrifying liquid returned by an aerobic tank are taken as electron acceptors to carry out anaerobic ammonia oxidation reaction, NH4、NO3 -Or NO2 -Is converted into N2And partial organic nitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the sewage are removed. In this process, CO2The method replaces organic matters as carbon sources, about 89% of inorganic nitrogen is converted to generate nitrogen, and 11% of inorganic nitrogen is converted to nitrate nitrogen, so that compared with the traditional nitrification and denitrification process, the anaerobic ammonia oxidation process only has 55-60% of energy consumption of the traditional process, almost no carbon sources are needed, and the alkalinity consumption can be reduced by 45%. Therefore, the anaerobic ammonium oxidation reaction of the anaerobic tank 101 can effectively denitrify, has low consumption of carbon source and is beneficial toThe carbon-nitrogen ratio of the sewage is improved, and the subsequent treatment is convenient.
Sewage treated by the anaerobic tank directly flows into the anoxic tank, aeration is not arranged in the anoxic tank 103 and the anaerobic tank 101, denitrifying bacteria are arranged in the anoxic tank, under the anoxic condition, part of organic matters are used as carbon sources, and abundant nitrate nitrogen contained in nitrifying liquid returned by the aeration biofilter is used as an electron acceptor to carry out denitrification reaction to generate nitrogen, so that the nitrate nitrogen in the sewage and part of organic matters for supplying energy to the denitrifying bacteria are removed; the returned nitrifying liquid also supplements part of dissolved oxygen; further, a stirring device is arranged in the anoxic tank 103 for stirring, so that the sewage is fully mixed with the denitrifying bacteria.
The sewage treated by the anoxic tank enters an aerobic tank, and under the set working condition, the aerobic tank promotes the ammonia nitrogen in the sewage to perform incomplete nitration reaction under the action of nitrifying bacteria by setting larger tank body volume, dissolved oxygen and controlling hydraulic retention time to generate a large amount of nitrite nitrogen and a small amount of nitrate nitrogen so as to remove partial organic matters and ammonia nitrogen in the sewage;
returning a part of the sewage treated by the aerobic tank to the anaerobic tank, allowing nitrite nitrogen in the returned liquid to participate in anaerobic ammoxidation reaction in the anaerobic tank, allowing the other part of the sewage to enter a sludge sedimentation tank for sludge sedimentation, allowing the effluent after sludge sedimentation to enter an aeration biological filter for further deep purification treatment, and discharging the precipitated sludge for subsequent sludge treatment;
the aeration biological filter tank has a structure similar to that of the aerobic tank, is internally provided with a filter layer and can further remove suspended matters, is provided with larger aeration quantity and dissolved oxygen quantity and is filled with more suspended biological fillers compared with the aerobic tank so as to carry out thorough nitrification reaction, and particularly, under the action of nitrifying bacteria, the residual nitrogen elements in the sewage are treated by the above treatment and are completely nitrified and converted into nitrate nitrogen, so that the residual nitrogen elements and the residual organic matters in the sewage are removed; then one part of the nitrified liquid flows back to the anoxic tank through a nitrate nitrogen return pipeline to participate in denitrification reaction, and the other part of the effluent is directly discharged.
The invention is provided with the aerobic deviceThe pool and the aeration biological filter pool can promote incomplete nitration reaction to generate nitrite nitrogen by adjusting the conditions of hydraulic retention time, dissolved oxygen amount, aeration amount and the like of the aerobic pool, then part of the nitrite nitrogen flows back to the anaerobic pool to generate anaerobic ammoxidation reaction to generate nitrogen, and the anaerobic ammoxidation reaction can consume CO2The method saves the consumption of an external carbon source, can effectively denitrify the nitrogen, promotes the thorough nitration reaction to generate nitrate nitrogen by improving the dissolved oxygen amount and other conditions of the aeration biological filter, and flows back to the anoxic tank to participate in denitrification.
In conclusion, the invention sets two groups of nitrifying liquid to flow back in a cross way, wherein nitrite nitrogen flows back to the anaerobic tank to participate in anaerobic ammonia oxidation, nitrogen removal is carried out under the condition of reducing carbon source consumption, nitrate nitrogen flows back to the anoxic tank to participate in denitrification, the nitrogen content of sewage is further reduced, and the nitrifying liquid is suitable for the treatment of low-carbon-nitrogen-ratio domestic sewage, the treatment efficiency of the domestic sewage is improved, and the sewage is ensured to be discharged after reaching the standard.
In addition, the anaerobic ammonia oxidation stage is positioned at the forefront of sewage treatment in the application, because the actual process conditions of anaerobic ammonia oxidation are harsh and difficult to control and generate, the actual operation effect of common engineering practice is poor, and the occurrence of anaerobic ammonia oxidation generally needs the occurrence of short-range reaction nitrate nitrogen, if the anaerobic ammonia oxidation is placed after the denitrification stage, can ensure that when the nitrate nitrogen removal reaction in the denitrification stage is incomplete, the anaerobic ammonia oxidation can carry out reaction treatment on the unreacted nitrate nitrogen and convert the unreacted nitrate nitrogen into nitrogen, thereby ensuring the removal effect of the total nitrogen, the total nitrogen can be removed by the denitrification stage, the anaerobic ammonia oxidation is used as the end stage to ensure thorough denitrification, however, the technical problem that anaerobic ammonia oxidation is difficult to control often exists in actual production, the anaerobic ammonia oxidation post-treatment is not reliable, and the risk that the total nitrogen treatment exceeds the standard in the sewage treatment process exists. The anaerobic ammoxidation reaction stage is arranged before the denitrification reaction stage, so that the effect of anaerobic ammoxidation is fully exerted (if the anaerobic ammoxidation reaction can occur, the process of removing sewage pollutants is most economical and efficient), and the final removal rate of total nitrogen and standard reaching of the total nitrogen under the condition of water quality with low carbon-nitrogen ratio can be ensured by denitrification with easy realization and control at the tail end.
Preferably, the biofilm carrier 102 comprises a central framework and fiber filaments which are positioned on the framework and irregularly radiated outwards, and form a columnar structure with the diameter of 0.3m, and the fiber filaments can be formed by spirally weaving polyacrylonitrile or polyester fibers. Further, the biofilm carriers 102 are suspended and fixed in the anaerobic tank by steel bars at the top of the tank.
Preferably, as shown in fig. 2, the suspended biological filler 105 is a hollow double-layer mesh sphere, is formed by injection molding of polypropylene, mainly plays a role of a biomembrane carrier, has a function of intercepting suspended matters, has the characteristics of strong biological adhesion, large specific surface area and high porosity, and can be freely suspended in the tank body.
Be equipped with charge device 107 on the sludge settling pond for add the sediment medicament in to the sludge settling pond, promote sludge settling, the better compound ferro-aluminum medicament of sedimentation effect can be adopted to the sediment medicament.
Preferably, the dissolved oxygen in the anaerobic tank is less than 0.2mg/L, and the dissolved oxygen in the anoxic tank is less than 0.5mg/L, so that the anaerobic tank and the anoxic tank are respectively in strict anaerobic and anoxic environments.
Preferably, the hydraulic retention time of the anaerobic tank is 4-8 hours, and the hydraulic retention time of the anoxic tank is 4-6 hours, so that the hydraulic retention time is adaptive to the volume of the tank body, and the optimal treatment effect is exerted.
Preferably, the reflux ratio of the aerobic tank is 200-500%, the reflux ratio of the biological aerated filter is 100-300%, and the proper reflux ratio is favorable for improving the denitrification efficiency.
In addition, for reasons of space and because other technologies not disclosed in the present application, such as removing phosphorus from wastewater, are conventional technologies, the present application is not repeated herein.
Example 1
In the embodiment, the volumes of an anaerobic pool, an anoxic pool and an aerobic pool are 2:1:3, the dissolved oxygen in the anaerobic pool is 0.1mg/L, the hydraulic retention time is 8h, the dissolved oxygen in the anoxic pool is 0.4mg/L, and the hydraulic retention time is 5 h; the working conditions of the aerobic tank are as follows: the filling amount of the suspended biological filler is 20 percent, the dissolved oxygen is set to be 1.0mg/L, the hydraulic retention time is controlled to be 15 hours, and the reflux ratio is 300 percent; the working conditions of the biological aerated filter are as follows: the filling amount of the suspended biological filler is 40 percent, the dissolved oxygen is 3mg/L, the hydraulic retention time is 3h, and the reflux ratio is 200 percent.
The sewage to be treated firstly enters an anaerobic tank and nitrite nitrogen which flows back from an aerobic tank to carry out anaerobic ammonia oxidation denitrification, then enters an anoxic tank and nitrate nitrogen which flows back from an aeration biological filter to carry out denitrification reaction for further denitrification, then enters an aerobic tank to carry out incomplete nitrification reaction under limited working conditions to generate nitrite nitrogen, part of COD is removed, finally, the sewage enters the aeration biological filter to carry out deep purification treatment after sludge is precipitated by a sludge sedimentation tank, the thorough nitrification reaction is carried out under limited working conditions to generate nitrate nitrogen, the residual nitrogen and COD are removed, the effluent meets the sewage discharge standard, and the effluent can be directly discharged. The total nitrogen removal rate of the sewage treated by the treatment device provided by the invention reaches 89.7%, the total nitrogen of the effluent is stably lower than 15mg/L, and the water quality conditions of the inlet water and the outlet water before and after treatment are shown in Table 1:
TABLE 1
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Claims (10)
1. An integrated device suitable for treating low-carbon-nitrogen-ratio domestic sewage is characterized by comprising an anaerobic tank, an anoxic tank, an aerobic tank, a sludge sedimentation tank and a biological aerated filter which are sequentially communicated in the sewage flow direction; a nitrite nitrogen return pipeline is arranged between the anaerobic tank and the aerobic tank, and a nitrate nitrogen return pipeline is arranged between the anoxic tank and the biological aerated filter;
a biological membrane carrier is arranged in the anaerobic tank, and anaerobic ammonia oxidizing bacteria and ammonifying bacteria are loaded on the biological membrane carrier; the anaerobic tank is used for enabling part of organic nitrogen in the sewage to carry out ammoniation reaction under the action of the ammoniation bacteria to generate ammonia nitrogen, and is used for enabling the ammonia nitrogen in the sewage and nitrite nitrogen and nitrate nitrogen which flow back from the aerobic tank to carry out anaerobic ammonia oxidation reaction under the action of the anaerobic ammonia oxidation bacteria to generate nitrogen so as to remove part of the organic nitrogen, the ammonia nitrogen, the nitrite nitrogen and the nitrate nitrogen in the sewage;
denitrifying bacteria are arranged in the anoxic pond; the anoxic tank is used for enabling the sewage treated by the anaerobic tank and the nitrate nitrogen refluxed by the biological aerated filter to perform denitrification reaction under the action of the denitrifying bacteria to generate nitrogen so as to remove the nitrate nitrogen and part of organic matters in the sewage;
suspended biological fillers, an aeration device and an oxygen dissolving instrument are arranged in the aerobic tank and the aeration biological filter tank, the filling amount of the suspended biological fillers in the aerobic tank and the aeration biological filter tank is 10-30% and 30-50% respectively, nitrobacteria are filled in the suspended biological fillers, and dominant nitrobacteria in the aerobic tank and the aeration biological filter tank are nitrite bacteria and nitrate bacteria respectively; the volume ratio of the anaerobic tank to the anoxic tank to the aerobic tank is (1-2) to (1-2-3); the working conditions of the aerobic tank are as follows: the dissolved oxygen is 0.5-1 mg/L, and the hydraulic retention time is controlled within 8-16 h; the working conditions of the biological aerated filter are as follows: the dissolved oxygen is 2-4 mg/L, and the hydraulic retention time is 2-4 h;
the aerobic tank is used for enabling part of ammonia nitrogen contained in the sewage treated by the anoxic tank to perform incomplete nitration reaction under the action of the nitrobacteria and under a limited working condition to generate a large amount of nitrite nitrogen and a small amount of nitrate nitrogen so as to remove part of organic matters and ammonia nitrogen in the sewage;
the sludge sedimentation tank is used for carrying out sludge sedimentation on the sewage treated by the aerobic tank;
the aeration biological filter is used for leading the sewage treated by the sludge sedimentation tank to carry out thorough nitration reaction under limited working conditions to generate nitrate nitrogen so as to remove residual nitrogen elements and residual organic matters in the sewage.
2. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 1,
the biomembrane carrier comprises a central framework and fiber yarns which are positioned on the framework and irregularly radiate outwards, and the fiber yarns are formed by spirally weaving polyacrylonitrile or polyester fibers.
3. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 2,
the biofilm carrier is suspended in the anaerobic tank.
4. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 1,
and a stirring device is arranged in the anoxic tank.
5. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 1,
the suspended biological filler is a hollow double-layer reticular sphere.
6. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 1,
and the sludge settling tank is provided with a dosing device for adding a settling medicament into the sludge settling tank.
7. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 6,
the precipitation medicament is a composite aluminum-iron medicament.
8. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 1,
the dissolved oxygen in the anaerobic tank is less than 0.2mg/L, and the dissolved oxygen in the anoxic tank is less than 0.5 mg/L.
9. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 1,
the hydraulic retention time of the anaerobic tank is 4-8 hours, and the hydraulic retention time of the anoxic tank is 4-6 hours.
10. The integrated apparatus for low carbon nitrogen ratio domestic sewage treatment of claim 1,
the reflux ratio of the aerobic tank is 200-500%, and the reflux ratio of the biological aerated filter is 100-300%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110936799.5A CN113620525A (en) | 2021-08-16 | 2021-08-16 | Integrated device suitable for low carbon nitrogen ratio domestic sewage treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110936799.5A CN113620525A (en) | 2021-08-16 | 2021-08-16 | Integrated device suitable for low carbon nitrogen ratio domestic sewage treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113620525A true CN113620525A (en) | 2021-11-09 |
Family
ID=78385610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110936799.5A Pending CN113620525A (en) | 2021-08-16 | 2021-08-16 | Integrated device suitable for low carbon nitrogen ratio domestic sewage treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113620525A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477422A (en) * | 2022-02-28 | 2022-05-13 | 两山生态科技(山东)有限公司 | System and process for enhancing denitrification effect of sewage with low C/N ratio by utilizing fermentation |
| CN115093014A (en) * | 2022-07-25 | 2022-09-23 | 华夏碧水环保科技股份有限公司 | Treatment system and treatment method for wastewater with low carbon-nitrogen ratio |
| CN116573817A (en) * | 2023-07-13 | 2023-08-11 | 四川省建筑科学研究院有限公司 | Integrated mixed biological treatment system and method for dispersed sewage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120018374A1 (en) * | 2009-04-09 | 2012-01-26 | Youfeng Sun | Sewage Treatment Process and System |
| CN105217891A (en) * | 2015-10-25 | 2016-01-06 | 北京工业大学 | A is strengthened based on DEAMOX 2the apparatus and method of/O+BAF technique biological carbon and phosphorous removal |
| CN108862841A (en) * | 2018-06-29 | 2018-11-23 | 襄阳先创环保科技有限公司 | One kind being based on modified form A2The sewage water treatment method of O technique |
-
2021
- 2021-08-16 CN CN202110936799.5A patent/CN113620525A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120018374A1 (en) * | 2009-04-09 | 2012-01-26 | Youfeng Sun | Sewage Treatment Process and System |
| CN105217891A (en) * | 2015-10-25 | 2016-01-06 | 北京工业大学 | A is strengthened based on DEAMOX 2the apparatus and method of/O+BAF technique biological carbon and phosphorous removal |
| CN108862841A (en) * | 2018-06-29 | 2018-11-23 | 襄阳先创环保科技有限公司 | One kind being based on modified form A2The sewage water treatment method of O technique |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477422A (en) * | 2022-02-28 | 2022-05-13 | 两山生态科技(山东)有限公司 | System and process for enhancing denitrification effect of sewage with low C/N ratio by utilizing fermentation |
| CN115093014A (en) * | 2022-07-25 | 2022-09-23 | 华夏碧水环保科技股份有限公司 | Treatment system and treatment method for wastewater with low carbon-nitrogen ratio |
| CN116573817A (en) * | 2023-07-13 | 2023-08-11 | 四川省建筑科学研究院有限公司 | Integrated mixed biological treatment system and method for dispersed sewage |
| CN116573817B (en) * | 2023-07-13 | 2023-09-26 | 四川省建筑科学研究院有限公司 | Integrated mixed biological treatment system and method for dispersed sewage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113620525A (en) | Integrated device suitable for low carbon nitrogen ratio domestic sewage treatment | |
| CN110436704B (en) | Urban sewage treatment upgrading and reforming process based on anaerobic ammonia oxidation | |
| CN109485152A (en) | A kind of apparatus and method of continuous flow municipal sewage short-cut denitrification part ANAMMOX advanced nitrogen dephosphorization | |
| CN113173640A (en) | AOA (argon oxygen decarburization) coupled anaerobic ammonia oxidation advanced nitrogen and phosphorus removal process | |
| CN105384247B (en) | It is a kind of that the method that part denitrification couples Anammox denitrogenation is realized by A/O biomembrane process | |
| CN108862582A (en) | One kind being based on part Anammox biomembrane A2The method of the bis- sludge system denitrogenation dephosphorizings of/O-IFAS-MBR | |
| CN104773828A (en) | Sewage treatment system of pig farm | |
| CN103030250B (en) | Reinforced-denitrification MBR (membrane bioreactor) sewage treatment method | |
| CN112607861B (en) | Process for treating municipal sewage by using excess sludge fermentation carbon source to strengthen denitrification dephosphorization, partial short-cut denitrification and anaerobic ammonia oxidation | |
| CN109205954A (en) | Light electrolysis catalysis oxidation, biochemical treatment high-concentration waste hydraulic art | |
| CN112125396A (en) | Anaerobic ammonia oxidation enhanced municipal sewage nitrogen and phosphorus removal system and method | |
| EP1805110A1 (en) | Process for the biological denitrification of ammonium containing wastewater | |
| CN216549815U (en) | Internal circulation short-cut denitrification filter tank | |
| CN112028243A (en) | Quick starting method of biological membrane system | |
| CN110759585A (en) | Device and method for removing total nitrogen in sewage | |
| Li et al. | Factors affecting simultaneous nitrification and denitrification in an SBBR treating domestic wastewater | |
| CN112551828A (en) | Low-carbon-nitrogen-ratio rural domestic sewage treatment device and treatment process thereof | |
| CN107265771A (en) | A kind of system and method for deeply treating wastewater | |
| CN115594288A (en) | Method for realizing synchronous treatment of domestic sewage and nitrate wastewater by SPNAED integrated MBBR by adding hydroxylamine | |
| CN112960773B (en) | Low C/N domestic sewage deep denitrification method based on normal state addition of oxidized nitrogen | |
| CN108033654A (en) | A kind of embrane method printing waste water processing system and method | |
| CN211546257U (en) | Highly integrated improved A/A/O-MBR integrated sewage treatment device | |
| CN110697893B (en) | Upflow type hydrolysis aerobic denitrification process for high ammonia nitrogen wastewater with poor biodegradability | |
| CN113248019A (en) | Short-cut nitrification and denitrification quick starting method for wastewater with low carbon-nitrogen ratio | |
| CN107129046A (en) | A kind of A2/ O-BCO water process modified technique |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |