CN115010257A - Method and device for deep denitrification of sewage - Google Patents
Method and device for deep denitrification of sewage Download PDFInfo
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- CN115010257A CN115010257A CN202210811525.8A CN202210811525A CN115010257A CN 115010257 A CN115010257 A CN 115010257A CN 202210811525 A CN202210811525 A CN 202210811525A CN 115010257 A CN115010257 A CN 115010257A
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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
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
本发明公开了一种污水深度脱氮的方法及装置，涉及污水处理技术领域。本发明采用硫自养反硝化(硫磺为电子供体)‑固体缓释碳源异养反硝化(固体缓释碳源为电子供体)协同的混合营养反硝化工艺代替AAO工艺中的缺氧池处理，一步即可完成污水脱氮处理；然后与好氧硝化工艺联合使用，能够实现深度除氮，且出水中COD、氨氮和总氮满足污水排放一级A标准，与传统AAO工艺相比，本发明提供的方法能够避免因投加水溶性碳源产生出水COD不稳定、总氮去除率不高、成本高等问题。而且，本发明采用能缓释碳的非水溶性固体物质作为碳源，碳源释放稳定，无需额外控制有机物浓度，能耗低，药剂投加量低，污水处理工艺简单且处理高效率高，成本低。
The invention discloses a method and a device for deep denitrification of sewage, and relates to the technical field of sewage treatment. The present invention adopts the synergistic mixed nutrition denitrification process of sulfur autotrophic denitrification (sulfur is an electron donor)-solid slow-release carbon source heterotrophic denitrification (solid slow-release carbon source is an electron donor) to replace the hypoxia in the AAO process The wastewater can be denitrified in one step; then it can be used in combination with the aerobic nitrification process to achieve deep nitrogen removal, and the COD, ammonia nitrogen and total nitrogen in the effluent meet the sewage discharge level A standard, compared with the traditional AAO process. The method provided by the invention can avoid the problems of unstable effluent COD, low total nitrogen removal rate and high cost caused by adding water-soluble carbon source. Moreover, the present invention uses a non-water-soluble solid substance capable of slow-release carbon as the carbon source, the carbon source is released stably, no additional control of the organic matter concentration is required, the energy consumption is low, the dosage of the chemical is low, the sewage treatment process is simple, and the treatment efficiency is high. low cost.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method and a device for deep denitrification of sewage.
Background
At present, an AAO (Anaerobic-aerobic-Oxic) process has the advantages of simple process, capability of removing nitrogen and phosphorus, good treatment effect and wide application in sewage treatment. The total nitrogen and the total phosphorus in the effluent of the single AAO process cannot meet the standard requirements of quasi V-class and quasi IV-class effluent. The deep reduction of total phosphorus can be realized by adding the high-efficiency sedimentation tank after the AAO process, and the deep denitrification can be realized by adding the denitrification filter tank.
Because the organic matter content in the urban domestic sewage is generally low, the denitrification effect of the AAO process stage is poor, the denitrification pressure of the subsequent denitrification filter is high, and because the available carbon source in the AAO stage sewage is almost exhausted, the water inlet carbon source in the denitrification filter stage is very little, water-soluble organic matter carbon sources such as methanol, ethanol, sodium acetate, glucose and the like need to be additionally added, and the cost is high. However, when the fluctuation of the water quality and the water quantity becomes large, the risk of insufficient or excessive carbon source dosage is easily generated, thereby leading to the overhigh Chemical Oxygen Demand (COD) concentration of effluent.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for deep denitrification of wastewater, and the method provided by the invention can realize stable denitrification, and has the advantages of low COD content in the effluent, simple operation and low cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for deep denitrification of sewage, which comprises the following steps:
sequentially carrying out mixed nutrient denitrification and aerobic nitrification on the sewage to be treated, and discharging the treated effluent after reaching the standard;
the mixed nutrient denitrification adopts a sulfur-carbon mixed electron donor; the sulfur-carbon mixed electron donor comprises sulfur and a solid slow-release carbon source; the solid slow-release carbon source is a water-insoluble solid substance capable of slowly releasing carbon.
Preferably, the ammonia nitrogen concentration of the sewage to be treated is 40-50 mg N/L, and the COD concentration is 50-500 mg/L.
Preferably, the mass ratio of the sulfur to the solid slow-release carbon source is 1: (0.6-3);
the solid slow-release carbon source comprises polybutylene succinate and corncobs, wherein the mass ratio of the polybutylene succinate to the corncobs is 1: (0.25 to 1).
Preferably, the particle size of the sulfur-carbon mixed electron donor is 6-7 mm.
Preferably as CaCO 3 Counting, wherein the alkalinity of the denitrification of the mixed nutrition is 70-280 mg/L; the temperature of mixed nutrition denitrification is 15-35 ℃, and the hydraulic retention time is 1-4 h.
Preferably, the aerobic nitrification temperature is 15-35 ℃, and the hydraulic retention time is 1-4 h.
Preferably, the aerobic nitrification is carried out under the aeration condition, and the aeration rate of aeration is 0.5-2L/min.
Preferably, when the nitrogen and COD in the effluent after aerobic nitrification do not meet the discharge requirement, the effluent after aerobic nitrification is circulated to perform mixed nutrient denitrification and aerobic nitrification until the nitrogen and COD in the treated effluent reach the standard.
The invention also provides a device for deep denitrification of sewage, which comprises a mixed nutrient denitrification pool 1, wherein the mixed nutrient denitrification pool 1 is provided with a first water inlet 1-1 and a first water outlet 1-2, and a sulfur-carbon mixed electron donor 1-3 is filled in the mixed nutrient denitrification pool 1;
the aerobic nitrification tank 2 is communicated with the first water outlet 1-2 through a second water inlet 2-1, and the aerobic nitrification tank 2 is also provided with a second water outlet 2-2 and a gas inlet 2-3; the aerobic nitrification tank 2 is filled with 2-5 parts of aeration stones.
Preferably, the device further comprises a water storage tank 3, a first pump 4-1 and a second pump 4-2;
the outlet of the water storage tank 3 is communicated with a first water inlet 1-1 through a first pump 4-1;
the second pump 4-2 is arranged on a pipeline which is communicated with the first water outlet 1-2 and the return port 2-4 of the aerobic nitrification tank 2.
The invention provides a method for deep denitrification of sewage, which comprises the following steps: sequentially carrying out mixed nutrient denitrification and aerobic nitrification on the sewage to be treated, and discharging the treated sewage after reaching the standard; the mixed nutrition denitrification adopts a sulfur-carbon mixed electron donor; the sulfur-carbon mixed electron donor comprises sulfur and a solid slow-release carbon source; the solid slow-release carbon source is a water-insoluble solid substance capable of slowly releasing carbon. The invention adopts a mixed nutrition denitrification process with the synergy of sulfur autotrophic denitrification (sulfur is an electron donor) and solid slow-release carbon source heterotrophic denitrification (solid slow-release carbon source is an electron donor) to replace the anoxic tank treatment in the AAO process, and the sewage denitrification treatment can be completed by one step; then the method is combined with an aerobic nitrification process to realize deep nitrogen removal, and COD, ammonia nitrogen and total nitrogen in the effluent meet the first-grade A standard of sewage discharge. Compared with the conventional water-soluble carbon source, the water-insoluble solid substance capable of slowly releasing carbon is used as the carbon source, the carbon source is stably released, the concentration of organic matters is not required to be additionally controlled, the energy consumption is low, the dosage of the medicament is low, the sewage treatment process is simple, the treatment efficiency is high, the cost is low, and the water-soluble carbon source is suitable for large-scale denitrification treatment of sewage, particularly domestic sewage. Compared with the traditional AAO process, the invention does not need to set a denitrification process after the AAO process, and simultaneously avoids the problems of unstable COD (chemical oxygen demand) of effluent, low total nitrogen removal rate, high cost and the like caused by adding a water-soluble carbon source.
As shown in the test results of the examples, the average value of COD of the influent water is 143.99mg/L, NH 3 The average value of N concentration is 44.61mg/L, after the continuous operation for 21 days, the average value of COD concentration in the final effluent is 28.15mg/L, and the average removal rate of COD is 78.74%; NH in the final effluent 3 The average values of the concentration of-N and TN are 1.52mg/L and11.24mg/L, and the average removal rate of ammonia nitrogen reaches 96.66 percent; the total nitrogen concentration in the final effluent was 11.24 mg/L. The invention combines the mixed nutrient denitrification and aerobic nitrification to treat the sewage, can ensure that the effluent is lower than the requirements of the first-level A standard of urban sewage discharge on COD, ammonia nitrogen and total nitrogen, and has practical application value.
Furthermore, water-soluble carbon sources such as methanol and ethanol have toxicity and flammability, so that safety risks exist in the processes of storage, transportation and operation.
In the process of denitrification and denitrification of the elemental sulfur, NO of 1mg/L can be calculated and obtained according to the reaction formula of the denitrification of the elemental sulfur 3 - Reduction of-N to SO of 7.83mg/L 4 2- Consuming 3.36mg/L of alkalinity (as CaCO) 3 Meter). In the denitrification reaction process, the pH value is greatly reduced due to the consumption of alkalinity, and the optimal pH value of the elemental sulfur in the autotrophic denitrification process is about 6.5-7.5, so if the internal alkalinity is not enough to maintain the near-neutral pH value, the alkalinity needs to be added externally, the operation is complex, and the cost is high. Moreover, elemental sulfur autotrophic denitrification will produce SO 4 2- By-product, excess SO 4 2- Can inhibit microorganisms to cause slow reaction, and easily generate hydrogen sulfide to blacken and turn the water body into odor when the dissolved oxygen of the water body is insufficient, thereby causing pollution to the environment. The method combines the elemental sulfur autotrophic denitrification and the solid slow-release carbon source heterotrophic denitrification, the solid slow-release carbon source heterotrophic denitrification process generates alkalinity, and the alkalinity consumed by the elemental sulfur autotrophic denitrification is just balanced, so that the alkalinity in the whole mixed nutrient denitrification process is maintained at 70-280 mg of CaCO 3 The method can well solve the problem of alkalinity balance in the sulfur simple substance autotrophic denitrification system without additionally adding alkali and can reduce SO 4 2- The production reduces the environmental pollution, and is safe and environment-friendly.
Drawings
FIG. 1 is a schematic diagram of a combined denitrification system and aerobic nitrification apparatus, wherein 1 is a denitrification tank, 1-1 is a first water inlet, 1-2 is a first water outlet, 1-3 is a sulfur-carbon electron donor, 1-4 is a first sampling port, 2 is an aerobic nitrification tank, 2-1 is a second water inlet, 2-2 is a second water outlet, 2-3 is an air inlet, 2-4 is a return port, 2-5 is an aeration stone, 2-6 is a second sampling port, 3 is a water storage tank, 4-1 is a first pump, and 4-2 is a second pump;
FIG. 2 shows the COD detection results of the effluent of the mixed nutrient denitrification and aerobic nitrification;
FIG. 3 shows ammonia Nitrogen (NH) in mixed nutrient denitrification and aerobic nitrification effluent 3 -N) the detection result;
FIG. 4 is a graph of nitrate Nitrogen (NO) in mixed nutrient denitrification and aerobic nitrification effluent 3 - -N) the detection result;
FIG. 5 is a graph of nitrite Nitrogen (NO) in mixed nutrient denitrification and aerobic nitrification effluent 2 - -N) the result of the detection.
Detailed Description
The invention provides a method for deep denitrification of sewage, which comprises the following steps:
and sequentially carrying out mixed nutrient denitrification and aerobic nitrification on the sewage to be treated, and discharging the treated effluent after reaching the standard.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
In the invention, the ammonia nitrogen concentration in the sewage to be treated is preferably 40-50 mg N/L, more preferably 42-48 mg N/L, and further preferably 44-46 mg N/L; the COD concentration is preferably 50 to 500mg/L, more preferably 100 to 300mg/L, and further preferably 100 to 200 mg/L.
In the invention, the mixed nutrient denitrification adopts a sulfur-carbon mixed electron donor; the sulfur-carbon mixed electron donor comprises sulfur and a solid slow-release carbon source; the mass ratio of the sulfur to the solid slow-release carbon source is preferably 1: (0.6-3), more preferably 1: (1-2.5), more preferably 1: (1.5-2). In the invention, the solid slow-release carbon source is a water-insoluble solid substance capable of slowly releasing carbon, and preferably comprises polybutylene succinate and corncobs, wherein the mass ratio of the polybutylene succinate to the corncobs is preferably 1: (0.25 to 1), more preferably 1: (0.4 to 0.8), and more preferably 1: (0.5-0.6). In the invention, the grain diameter of the sulfur-carbon mixed electron donor is preferably 6-7 mm, more preferably 6.2-6.8 mm, and further preferably 6.4-6.6 mm; the sulfur-carbon mixed electron donor is preferably a spherical particle.
In the present invention, as CaCO 3 In terms of the alkalinity of the mixed nutrition denitrification, the alkalinity is preferably 70-280 mg/L, more preferably 100-250 mg/L, and further preferably 150-200 mg/L; the temperature of mixed nutrition denitrification is preferably 15-35 ℃, more preferably 20-30 ℃, and further preferably 25 ℃; the hydraulic retention time (single hydraulic retention time) of the mixed nutrition denitrification is preferably 1-4 h, more preferably 1.5-3.5 h, and further preferably 2-3 h.
In the invention, the aerobic nitrification temperature is preferably 15-35 ℃, more preferably 20-30 ℃, and further preferably 25 ℃; the hydraulic retention time (single hydraulic retention time) of the aerobic nitrification is preferably 1-4 h, more preferably 1.5-3.5 h, and further preferably 2-3 h. In the present invention, the aerobic nitrification is preferably performed under aeration conditions, and the aeration rate of the aeration is preferably 0.5 to 2L/min, more preferably 1.0 to 1.5L/min, and still more preferably 1L/min. In the invention, in the aeration process, air flows through the aeration stones in sequence to distribute air uniformly.
In the invention, when the nitrogen and COD in the effluent after aerobic nitrification do not meet the discharge requirement, the effluent after aerobic nitrification is preferably circulated to perform mixed nutrient denitrification and aerobic nitrification until the nitrogen and COD in the treated effluent reach the standard.
The invention also provides a device for deep denitrification of sewage, which comprises a mixed nutrient denitrification tank 1 and an aerobic nitrification tank 2, and the device for deep denitrification of sewage is explained in detail with reference to the figure 1.
The device for deep denitrification of sewage comprises a mixed nutrient denitrification tank 1, wherein the mixed nutrient denitrification tank 1 is provided with a first water inlet 1-1 and a first water outlet 1-2, and the first water inlet 1-1 and the first water outlet 1-2 are preferably arranged on the opposite side surfaces of the mixed nutrient denitrification tank 1; the top of the mixed nutrient denitrification tank 1 is preferably provided with a first sampling port 1-4; the mixed nutrient denitrification pool 1 is filled with sulfur-carbon mixed electron donors 1-3; the sulfur-carbon mixed electron donor is the same as the above-mentioned sulfur-carbon mixed electron donor, and is not described herein again.
The device for deep denitrification of sewage comprises an aerobic nitrification tank 2, wherein the aerobic nitrification tank 2 is provided with a second water inlet 2-1, a second water outlet 2-2 and an air inlet 2-3, the second water inlet 2-1 and the second water outlet 2-2 are preferably arranged on opposite sides of the aerobic nitrification tank 2, the aerobic nitrification tank 2 is preferably also provided with a return port 2-4, and the return port 2-4 is preferably arranged on the same side of the second water inlet 2-1; the air inlet 2-3 is preferably arranged at the bottom of the aerobic nitrification tank 2; the top of the aerobic nitrification tank 2 is preferably also provided with a second sampling port 2-6. In the invention, the aerobic nitrification tank 2 is filled with 2-5 parts of aeration stones.
The device for deep denitrification of sewage provided by the invention preferably further comprises a water storage tank 3, a first pump 4-1 and a second pump 4-2; the outlet of the water storage tank 3 is preferably communicated with the first water inlet 1-1 through a first pump 4-1; the second pump 4-2 is preferably arranged on a pipeline of the return port 2-4 communicated with the first water outlet 1-2; the first pump 4-1 and the second pump 4-2 are each preferably peristaltic pumps.
The method for carrying out the deep denitrification on the sewage by adopting the device comprises the following steps by combining with a figure 1: continuously conveying the sewage to be treated in the water storage tank 3 to the mixed nutrition denitrification tank 1 through a first pump 4-1 and a first water inlet 1-1, mixed nutrition denitrification is carried out under the action of a sulfur-carbon mixed electron donor 1-3, the obtained mixed nutrition denitrification effluent is conveyed into an aerobic nitrification tank 2 through a first water outlet 1-2 and a second water inlet 2-1, meanwhile, air flows through the aeration stone 2-5 through the air inlet 2-3 to perform uninterrupted aeration, the mixed nutrient denitrification effluent is subjected to aerobic nitrification under the action of aeration, the aerobic nitrification effluent flows back into the mixed nutrient denitrification tank 1 through the return port 2-4, the second pump 4-2 and the first water inlet 1-1 to perform circulation treatment (mixed nutrient denitrification-aerobic nitrification), and the treated (aerobic nitrification effluent) effluent is discharged after reaching the standard. In the present invention, the reflux ratio of the reflux is preferably 100 to 300%, more preferably 150 to 300%, and further preferably 200 to 300%.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The apparatus shown in FIG. 1 was used for sewage treatment.
Continuously conveying sewage to be treated in a water storage tank 3 into a mixed nutrient denitrification tank 1 with the volume of 100mL through a first pump 4-1 and a first water inlet 1-1, carrying out mixed nutrient denitrification under the action of a sulfur-carbon mixed electron donor 1-3, conveying obtained mixed nutrient denitrification effluent into an aerobic nitrification tank 2 with the volume of 100mL through a first water outlet 1-2 and a second water inlet 2-1, simultaneously allowing air to flow through an air inlet 2-3 to an aeration stone 2-5 for uninterrupted aeration, carrying out aerobic nitrification on the mixed nutrient denitrification effluent under the action of aeration, allowing the aerobic nitrification water to flow back into the mixed nutrient denitrification tank 1 through a return port 2-4, a second pump 4-2 and the first water inlet 1-1 (the reflux ratio is 300 percent), and carrying out cyclic treatment (mixed nutrient denitrification-aerobic nitrification), continuously running for 21 days, and discharging the treated effluent (aerobic nitrification effluent) after reaching the standard. Wherein the mass ratio of sulfur, poly butylene succinate and corncobs in the sulfur-carbon mixed electron donor is 1:0.6: 0.35; the hydraulic retention time of the mixed nutrition denitrification and the aerobic nitrification is 2 hours, and the water inlet temperature is 25 ℃; the sewage to be treated is actual domestic sewage, and the quality of inlet water is shown in table 1. In the operation process, the content of COD, ammonia nitrogen, nitrate nitrogen and nitrite nitrogen in the effluent (recorded as effluent B1) from the first sampling port 1-4 and the content of the effluent (recorded as effluent B2) from the second sampling port 2-6 are respectively detected, and the detection results are shown in Table 2 and figures 2-5, wherein figure 2 is the detection result of COD in the effluent of mixed nutrient denitrification and aerobic nitrification, figure 3 is the detection result of ammonia nitrogen in the effluent of mixed nutrient denitrification and aerobic nitrification, figure 4 is the detection result of nitrate nitrogen in the effluent of mixed nutrient denitrification and aerobic nitrification, and figure 5 is the detection result of nitrite nitrogen in the effluent of mixed nutrient denitrification and aerobic nitrification.
TABLE 1 actual domestic wastewater quality
TABLE 2 quality of mixed nutrient denitrification-nitrification effluent
As can be seen from tables 1 to 2 and FIGS. 2 to 5, the average value of the influent COD was 143.99mg/L, and the ammonia Nitrogen (NH) 3 -N) concentration average value is 44.61mg/L, after continuous operation for 21 days, COD concentration average value in final effluent is 28.15mg/L, and COD average removal rate is 78.74%; NH in the final effluent 3 The average concentration values of-N and TN are respectively 1.52mg/L and 11.24mg/L, and the average removal rate of ammonia nitrogen reaches 96.66%; the total nitrogen concentration in the final effluent was 11.24 mg/L. The invention combines the mixed nutrient denitrification and aerobic nitrification to treat the sewage, can ensure that the effluent is lower than the requirements of the first-level A standard of urban sewage discharge on COD, ammonia nitrogen and total nitrogen, and has practical application value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
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Application publication date: 20220906 |