AAO coupled sulfur autotrophic denitrification wastewater advanced treatment device
By coupling the AAO process with sulfur autotrophic denitrification and using the sulfur source as an electron donor, the problem of insufficient carbon source in the AAO process was solved, and low-cost deep wastewater treatment was achieved.
Patent Information
- Application Number
- CN202422810457.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-18
AI Technical Summary
The existing AAO process requires additional carbon sources when treating low-carbon source wastewater, which leads to high costs, increased sludge production and large carbon emissions, and may produce toxic organic compounds.
The AAO unit is coupled with the sulfur autotrophic denitrification unit, and a low-cost sulfur source is used as an electron donor to achieve deep treatment of COD, TN and TP in wastewater, avoiding the addition of additional carbon sources.
The deep treatment of COD, TN and TP in wastewater is achieved at low cost, with removal rates reaching 88%, 96% and 96% respectively, which reduces operating costs and sludge production.
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Figure CN223409457U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewage treatment, in particular to an AAO coupled sulfur autotrophic denitrification wastewater deep treatment device. Background Art
[0002] Nitrogen pollution in wastewater is one of the main causes of eutrophication. How to effectively improve the total nitrogen (TN) treatment capacity of wastewater treatment processes has become an urgent issue in the environmental protection industry.
[0003] Currently, the most mainstream wastewater treatment process is the AAO (Anaerobic-Anoxic-Oxic) process, also known as the anaerobic-anoxic-aerobic process. This process combines anaerobic, anoxic, and aerobic stages for secondary or tertiary wastewater treatment, achieving excellent nitrogen and phosphorus removal results. TN removal primarily relies on the denitrification biological process. In conventional denitrification processes, the carbon source concentration in the wastewater directly impacts denitrification efficiency. However, urban wastewater in my country currently generally has low carbon source content and high nitrogen and phosphorus concentrations. Consequently, carbon source insufficiency often occurs during the denitrification step, necessitating the addition of additional carbon sources as electron donors to ensure smooth denitrification. However, this not only significantly increases wastewater treatment costs but also can lead to higher sludge production and carbon emissions. Furthermore, some types of organic carbon sources can combine with chloride ions to form toxic organic compounds such as trihalomethanes (THMs) and haloacetic acids (HAAs), threatening downstream ecological safety.
[0004] In view of this, the present utility model is proposed. Utility Model Content
[0005] The purpose of this utility model is to provide an AAO-coupled sulfur autotrophic denitrification deep wastewater treatment device. By coupling the AAO unit with the sulfur autotrophic denitrification unit, the AAO unit can remove COD, TN, and TP from the wastewater, while the sulfur autotrophic denitrification unit can achieve deep removal of TN from the wastewater. Therefore, the device can simultaneously achieve deep treatment of COD, TN, and TP in the wastewater at a low operating cost. This solves the problems of insufficient carbon source in the denitrification biological process section of the traditional AAO process, which requires additional carbon source addition, resulting in significantly increased costs, higher sludge production, and higher carbon emissions.
[0006] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:
[0007] The utility model provides an AAO-coupled sulfur autotrophic denitrification wastewater deep treatment device, which includes a regulating unit, an AAO unit, and a sulfur autotrophic denitrification unit arranged in sequence. The regulating unit includes a regulating tank, which is used to homogenize the wastewater; the regulating tank is provided with a water inlet for inputting the wastewater. The AAO unit includes an anaerobic tank, an anoxic tank, and an aerobic tank connected in sequence, and the AAO unit is used to remove COD, TN, and TP in the wastewater; the regulating tank is connected to the anaerobic tank. The sulfur autotrophic denitrification unit includes an oxygen reduction tank, a sulfur autotrophic denitrification tank, and a sedimentation tank connected in sequence; the aerobic tank is connected to the oxygen reduction tank; the oxygen reduction tank is used to reduce the dissolved oxygen concentration in the wastewater; the sulfur autotrophic denitrification tank is used to deeply treat TN in the wastewater; the sedimentation tank is used to precipitate the wastewater; and the sedimentation tank is provided with a drain for discharging the treated wastewater.
[0008] Furthermore, the regulating unit also includes an inlet pump and an inlet flow meter, which are sequentially arranged between the regulating tank and the anaerobic tank, and the inlet pump and the inlet flow meter are used to jointly regulate the inlet flow of the wastewater entering the anaerobic tank.
[0009] Furthermore, a first agitator is provided in the anaerobic tank.
[0010] Furthermore, a second agitator is provided in the anoxic tank.
[0011] Furthermore, an air distribution device is provided in the aerobic pool.
[0012] Furthermore, a fan is provided outside the aerobic pool, and the fan is connected to the air distribution device. The fan and the air distribution device are used to provide dissolved oxygen into the aerobic pool.
[0013] Furthermore, the aerobic tank is connected to the anoxic tank via a pipeline via a wastewater reflux pump.
[0014] Furthermore, a third agitator is provided in the oxygen reduction tank.
[0015] Furthermore, a fourth agitator is provided in the sulfur autotrophic denitrification tank.
[0016] Furthermore, the sulfur autotrophic denitrification tank is also connected to a drug storage tank, and the drug storage tank is used to store sulfur sources, inorganic bases and nutrient elements.
[0017] Furthermore, a dosing pump is provided between the sulfur autotrophic denitrification tank and the drug storage tank, and the dosing pump is used to input the drug in the drug storage tank into the sulfur autotrophic denitrification tank.
[0018] Furthermore, a fifth agitator is provided in the medicine storage tank.
[0019] Furthermore, a sludge return port and a sludge discharge port are respectively provided at the bottom of the sedimentation tank; the sludge return port is connected to the bottom of the anaerobic tank via a pipeline through a sludge return pump; the sludge discharge port is used to discharge sludge residue.
[0020] Furthermore, the wastewater deep treatment device also includes an electric control cabinet, which is used to control the working status of each unit in the wastewater deep treatment device.
[0021] Compared with the prior art, the beneficial effects of the present invention are:
[0022] (1) The AAO coupled sulfur autotrophic denitrification wastewater deep treatment device provided by the utility model couples the traditional AAO unit with the sulfur autotrophic denitrification unit, wherein the sulfur autotrophic denitrification unit can use a low-cost sulfur source as an electron donor to convert NO3 - -N (nitrate nitrogen) is converted into N2 without the need for additional carbon source, making it very suitable for treating NO3 in wastewater lacking organic carbon sources - -N, can achieve deep treatment of COD, TN and TP in wastewater at a lower operating cost.
[0023] (2) The wastewater deep treatment device provided by the utility model by AAO coupled sulfur autotrophic denitrification has the advantages of high efficiency, environmental protection, simple operation, low operating cost and high degree of automation.
[0024] (3) The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification provided by the utility model has a TN removal rate of more than 96%, a TP removal rate of more than 96%, and a COD removal rate of more than 88%. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0026] Figure 1 This is a structural schematic diagram of the wastewater deep treatment device provided by the utility model using AAO coupled sulfur autotrophic denitrification.
[0027] Reference numerals:
[0028] 1-regulating unit; 11-regulating tank; 12-water inlet pump; 13-water inlet flowmeter; 2-AAO unit; 21-anaerobic tank; 22-anoxic tank; 23-aerobic tank; 24-first agitator; 25-second agitator; 26-air distribution device; 27-fan; 28-wastewater return pump; 3-sulfur autotrophic denitrification unit; 31-oxygen reduction tank; 32-sulfur autotrophic denitrification tank; 33-sedimentation tank; 34-third agitator; 35-fourth agitator; 36-drug storage tank; 37-dosing pump; 38-fifth agitator; 39-sludge return pump; 4-electric control cabinet. DETAILED DESCRIPTION
[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.
[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0032] Unless otherwise specified, terms such as "first aspect," "second aspect," and "third aspect" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, terms such as "first," "second," and "third," etc., serve only as non-exhaustive enumerations and descriptions and should not constitute closed-ended limitations on quantity.
[0033] Unless otherwise specified, the terms "include" and "comprising" used in this invention may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.
[0034] The utility model provides a wastewater deep treatment device for AAO coupled sulfur autotrophic denitrification, such as Figure 1 The figure shows a structural diagram or a connection diagram of the wastewater deep treatment device provided by the present invention, which is coupled with an AAO sulfur autotrophic denitrification. The wastewater deep treatment device includes a regulating unit 1, an AAO unit 2 and a sulfur autotrophic denitrification unit 3 arranged in sequence.
[0035] Among them, AAO is the abbreviation of the first letters of Anaerobic-Anoxic-Oxic (anaerobic-anoxic-aerobic), which is a sewage treatment process with the function of simultaneous nitrogen and phosphorus removal.
[0036] Among them, see Figure 1 The regulating unit 1 includes a regulating tank 11, and the regulating tank 11 is used to homogenize the wastewater.
[0037] The regulating tank 11 is provided with a water inlet for inputting the wastewater, that is, the water inlet is used to input the wastewater to be treated into the wastewater deep treatment device.
[0038] See also Figure 1 The AAO unit 2 includes an anaerobic tank 21, an anoxic tank 22 and an aerobic tank 23 connected in sequence. The AAO unit 2 is used to remove COD, TN and TP in the wastewater.
[0039] Among them, COD refers to chemical oxygen demand, TN refers to total nitrogen, and TP refers to total phosphorus, which are all indicators of wastewater treatment.
[0040] Specifically, the anaerobic tank 21 is used to remove part of the BOD and a small part of the TN in the wastewater, and release the TP in the polyphosphate bacteria; the anoxic tank 22 is used to remove part of the COD and most of the TN in the wastewater; the aerobic tank 23 is used to remove most of the COD and most of the TP in the wastewater, and use the nitrification reaction to remove most of the NH4 +-N (ammonium nitrogen) is converted into NO3 through nitrification - -N (nitrate nitrogen).
[0041] See also Figure 1 The regulating tank 11 is connected to the anaerobic tank 21.
[0042] See also Figure 1 The sulfur autotrophic denitrification unit 3 includes an oxygen reduction tank 31, a sulfur autotrophic denitrification tank 32 and a sedimentation tank 33 which are connected in sequence.
[0043] The aerobic pool 23 is connected to the oxygen reduction pool 31 .
[0044] The oxygen reduction tank 31 is used to reduce the dissolved oxygen concentration in the wastewater.
[0045] The sulfur autotrophic denitrification tank 32 is used to deeply remove the remaining TN in the wastewater.
[0046] The sedimentation tank 33 is used to precipitate the wastewater.
[0047] The sedimentation tank 33 is provided with a drain outlet for discharging the treated wastewater.
[0048] The use of autotrophic bacteria that use inorganic elements as electron donors to complete the denitrification process can reduce the TN discharge of wastewater. Among them, the sulfur autotrophic denitrification process (SAD) is a process that can utilize elemental sulfur (S 0 ), sulfide (S 2- ), thiosulfate (S2O3 2- ), thiocyanate (SCN - ) and other cheap reducing sulfur elements as electron donors to convert NO3 - The biological process of converting -N into N2 can not only be used as a separate process, but also as a supplementary process for traditional denitrification process to reduce the overall cost of wastewater denitrification.
[0049] The AAO coupled sulfur autotrophic denitrification wastewater deep treatment device provided by the utility model couples the traditional AAO unit 2 (AAO process) with the sulfur autotrophic denitrification unit 3 (sulfur autotrophic denitrification process), wherein the sulfur autotrophic denitrification unit 3 can use a low-cost sulfur source as an electron donor to convert NO3 - -N is converted into N2 without the need for additional carbon source, making it very suitable for treating NO3 in wastewater lacking organic carbon sources --N can achieve deep treatment of COD, TN and TP in wastewater at a lower operating cost. This solves the problem of insufficient carbon source in the denitrification biological process of the traditional AAO process, which requires additional carbon source addition, resulting in significantly increased costs, higher sludge production and carbon emissions.
[0050] Therefore, the wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification provided by the utility model has the advantages of high efficiency, environmental protection, simple operation and low operating cost.
[0051] In some specific embodiments, see Figure 1 The regulating unit 1 also includes a water inlet pump 12 and a water inlet flow meter 13, wherein the water inlet pump 12 and the water inlet flow meter 13 are sequentially arranged between the regulating tank 11 and the anaerobic tank 21, and the water inlet pump 12 and the water inlet flow meter 13 are used to jointly regulate the inlet flow of the wastewater entering the anaerobic tank 21.
[0052] In one specific embodiment, the bottom of the regulating tank 11 is connected to the top of the anaerobic tank 21 via a pipeline through an inlet pump 12 and an inlet flowmeter 13. The inlet pump 12 pumps wastewater from the bottom of the regulating tank 11 into the anaerobic tank 21. The inlet flowmeter 13 is used to adjust the inlet flow rate of the wastewater, thereby controlling the hydraulic retention time.
[0053] In some specific embodiments, see Figure 1 The anaerobic tank 21 is provided with a first agitator 24, and the anoxic tank 22 is provided with a second agitator 25. The first agitator 24 is used to agitate the wastewater and sludge in the anaerobic tank 21. The second agitator 25 is used to agitate the wastewater and sludge in the anoxic tank 22.
[0054] It is understood that after being stirred by the first agitator 24 in the anaerobic tank 21, the wastewater is completely mixed with the return sludge from the sedimentation tank 33. After a certain period of anaerobic decomposition, some of the organic pollutants with good biodegradability in the wastewater are removed, and a small amount of nitrogen-containing compounds are converted into N2 (denitrification). At the same time, the polyphosphate microorganisms (polyphosphate bacteria, etc.) in the return sludge release phosphorus. After that, the wastewater enters the anoxic tank 22. The denitrifying bacteria in the anoxic tank 22 use the remaining COD in the wastewater as a carbon source to convert the NO3 - -N is reduced to N2 and released.
[0055] In a specific embodiment, the water outlet at the top of the anaerobic tank 21 is connected to the water inlet at the bottom of the anoxic tank 22 through a pipeline.
[0056] In a specific embodiment, the water outlet at the top of the anoxic tank 22 is connected to the water inlet at the bottom of the aerobic tank 23 through a pipeline.
[0057] In some specific embodiments, see Figure 1 The aerobic pool 23 is internally provided with an air distribution device 26 , wherein the air distribution device 26 is used to increase the dissolved oxygen in the aerobic pool 23 .
[0058] In some specific embodiments, see Figure 1 A fan 27 is provided outside the aerobic pool 23 , and the fan 27 is connected to the air distribution device 26 . The fan 27 and the air distribution device 26 are used to provide dissolved oxygen into the aerobic pool 23 .
[0059] In a specific embodiment, the fan 27 is connected to the air distribution device 26 through a pipeline passing through the wall of the aerobic pool 23.
[0060] In some specific embodiments, see Figure 1 The aerobic tank 23 is connected to the anoxic tank 22 through a pipeline via a wastewater reflux pump 28.
[0061] In a specific embodiment, the pipeline connected to the outlet of the aerobic tank 23 is divided into two paths by a tee, one of which is connected to the water inlet of the anoxic tank 22 through the wastewater return pump 28, and the other is connected to the oxygen reduction tank 31.
[0062] In some specific embodiments, see Figure 1 A third agitator 34 is provided in the oxygen reduction tank 31, and a fourth agitator 35 is provided in the sulfur autotrophic denitrification tank 32. The third agitator 34 is used to agitate the wastewater and sludge in the oxygen reduction tank 31; the fourth agitator 35 is used to agitate the wastewater and sludge in the sulfur autotrophic denitrification tank 32.
[0063] In a specific embodiment, the water outlet at the top of the oxygen reduction tank 31 is connected to the water inlet at the bottom of the sulfur autotrophic denitrification tank 32 through a pipeline.
[0064] In a specific embodiment, the water outlet at the top of the sulfur autotrophic denitrification tank 32 is connected to the water inlet at the top of the sedimentation tank 33 through a pipeline.
[0065] In one specific embodiment, the sulfur autotrophic denitrification tank 32 can be operated using a traditional activated sludge process. Alternatively, the tank 32 can be modified into a moving bed biofilm reactor (MBBR) by adding lightweight fillers to improve denitrification efficiency. This can significantly reduce reagent waste and filler clogging.
[0066] As an example, the filling amount of the filler in the sulfur autotrophic denitrification tank 32 may be 40% to 50% of the effective volume of the tank body, but is not limited thereto.
[0067] In some specific embodiments, see Figure 1 The sulfur autotrophic denitrification tank 32 is also connected to a drug storage tank 36 for storing a sulfur source, an inorganic base, and nutrient elements. The sulfur source, inorganic base, and nutrient elements are mixed with water and then pumped into the sulfur autotrophic denitrification tank 32 for a sulfur autotrophic denitrification reaction, thereby degrading nitrate nitrogen.
[0068] The inorganic base and the nutrient elements may be any reagents commonly used in the art, and the present invention does not limit this.
[0069] Wherein, the sulfur source includes elemental sulfur (S 0 ), sulfide (S 2- ), thiosulfate (S2O3 2- ), thiocyanate (SCN - ), etc., but not limited to these.
[0070] It is understandable that the amount of sulfur source, inorganic base and nutrient elements added can be determined according to the nitrate nitrogen concentration in the effluent of the AAO unit 2, and the present invention does not limit this.
[0071] In some specific embodiments, see Figure 1 A dosing pump 37 is also provided between the sulfur autotrophic denitrification tank 32 and the drug storage tank 36 , and the dosing pump 37 is used to input the reagent (a mixture of sulfur source, inorganic base, nutrient elements and water) in the drug storage tank 36 into the sulfur autotrophic denitrification tank 32 .
[0072] In some specific embodiments, see Figure 1 The medicine storage tank 36 is provided with a fifth stirrer 38 for stirring the mixture of sulfur source, inorganic base, nutrient elements and water.
[0073] In some specific embodiments, the first agitator 24, the second agitator 25, the third agitator 34, the fourth agitator 35, and the fifth agitator 38 can be any agitator commonly used in the art, such as a propeller agitator, a turbine agitator, a magnetic agitator, or a screw agitator, etc., and the present invention does not limit this.
[0074] In a specific embodiment, the dissolved oxygen concentration in the anaerobic tank 21 is in the range of <0.2 mg / L.
[0075] In a specific embodiment, the dissolved oxygen concentration in the anoxic tank 22 is in the range of ≤0.5 mg / L.
[0076] In a specific embodiment, the dissolved oxygen concentration in the aerobic tank 23 is in the range of 2 to 4 mg / L.
[0077] In a specific embodiment, the dissolved oxygen concentration in the sulfur autotrophic denitrification tank 32 is ≤0.5 mg / L.
[0078] In one specific embodiment, the reaction time of each reaction tank in the AAO unit 2 (i.e., the anaerobic tank 21, the anoxic tank 22, and the aerobic tank 23) is independently 30 minutes to 240 minutes. This time can be determined based on the concentration of pollutants in the influent and adjusted by the influent flow rate and the effective volume of the tank.
[0079] In a specific embodiment, the reaction time of the sulfur autotrophic reaction in the sulfur autotrophic denitrification tank 32 is 30 minutes to 240 minutes, which can be determined according to the nitrate nitrogen concentration in the effluent of the AAO unit 2 and adjusted by the inlet flow rate and the effective volume of the tank.
[0080] In some specific embodiments, see Figure 1 The bottom of the sedimentation tank 33 is provided with a sludge return port and a sludge discharge port; the sludge return port is connected to the bottom of the anaerobic tank 21 through a pipeline via a sludge return pump 39; the sludge discharge port is used to discharge sludge.
[0081] That is, the sludge can be returned to the anaerobic tank 21 through the pipeline, or discharged outside the wastewater advanced treatment device.
[0082] In a specific embodiment, the water inlet and the water outlet at the top of the sedimentation tank 33 are symmetrically distributed, that is, they are respectively arranged on both sides of the sedimentation tank 33, wherein the horizontal line of the water outlet is slightly lower than the water inlet.
[0083] In some specific embodiments, see Figure 1 The wastewater deep treatment device also includes an electric control cabinet 4, which is used to control the working status of each unit in the wastewater deep treatment device.
[0084] The wastewater deep treatment device with AAO coupled sulfur autotrophic denitrification provided by the utility model is provided with an electric control cabinet 4 for controlling the working state of each unit in the wastewater deep treatment device, and has a high degree of automation.
[0085] In some specific embodiments, the method for deep treatment of wastewater using the wastewater deep treatment device provided by the utility model coupled with AAO and sulfur autotrophic denitrification is as follows:
[0086] First, wastewater enters the regulating tank 11 through the water inlet. The main function of the regulating tank 11 is to homogenize the wastewater.
[0087] Subsequently, the wastewater is pumped into the AAO unit 2 through the water inlet pump 12, and passes through the anaerobic tank 21, the anoxic tank 22 and the aerobic tank 23 in sequence to complete the removal of COD, TN and TP in the wastewater. Among them, after being stirred by the first agitator 24 in the anaerobic tank 21, the wastewater is completely mixed with the return sludge from the sedimentation tank 33. After a certain period of anaerobic decomposition, some of the organic pollutants with better biodegradability in the wastewater are removed, and a small amount of nitrogen-containing compounds are converted into N2 (denitrification). At the same time, the polyphosphate microorganisms (polyphosphate bacteria, etc.) in the return sludge release phosphorus. The wastewater then flows into the anoxic tank 22 by gravity. The denitrifying bacteria in the anoxic tank 22 use the remaining COD in the wastewater as a carbon source to convert the NO3 - -N is reduced to N2 and released. Then, the wastewater flows into the aerobic tank 23 by gravity, and the NH4 + -N generates NO3 through nitrification - -N, and at the same time, the organic matter in the water is oxidized and decomposed to provide energy for phosphorus-absorbing microorganisms, and the microorganisms absorb phosphorus from the water to achieve phosphorus removal.
[0088] Afterwards, the wastewater flows through the oxygen reduction tank 31 to the sulfur autotrophic denitrification tank 32, where it is mixed with the reagent pumped in from the reagent storage tank 36 via the reagent pump 37 to deeply remove the remaining total nitrogen, thus completing the deep treatment of TN.
[0089] Finally, the treated wastewater flows through the sedimentation tank 33 and is discharged from the wastewater deep treatment device.
[0090] The method for deeply treating wastewater by using the wastewater deep treatment device of AAO coupled with sulfur autotrophic denitrification provided by the utility model can achieve deep removal of COD, total nitrogen and total phosphorus in the wastewater.
[0091] The effluent treated by the wastewater deep treatment device with AAO coupled sulfur autotrophic denitrification provided by the utility model has the pollutant concentration that can meet the discharge standard or further treatment requirements, among which the total nitrogen concentration can reach the surface water category IV standard.
[0092] The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification provided by the utility model can treat urban wastewater, realize deep removal of COD, TN and TP in urban wastewater, and has high treatment efficiency, strong operability and low cost.
[0093] In a specific implementation method, a newly built urban wastewater treatment plant needs to accept 80,000 m3 of urban wastewater. 3 / d, with COD, TN, and TP concentrations of approximately 350 mg / L, 60 mg / L, and 10 mg / L, respectively. The AAO-coupled sulfur autotrophic denitrification wastewater deep treatment device provided by the utility model utilizes an AAO-coupled sulfur autotrophic denitrification process, using elemental sulfur and other nutrients as sulfur autotrophic denitrification agents. After treating the aforementioned urban wastewater, the effluent TN concentration was less than 1 mg / L, and the average TN removal rate was 96.6%. Specific water quality indicators are shown in Table 1. In Table 1, Samples 1, 2, and 3 represent different batches of urban wastewater.
[0094] Table 1 Comparison of water quality indicators of urban wastewater collected by wastewater treatment plants before and after treatment
[0095]
[0096] In summary, the wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification provided by the utility model can achieve deep treatment of COD, TN and TP in wastewater, and has the advantages of high efficiency, environmental protection, simple operation and low operating cost.
[0097] Although the present invention has been illustrated and described using specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features therein may be replaced by equivalents, without departing from the spirit and scope of the present invention. However, these modifications or replacements do not deviate from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.
Claims
1. A wastewater deep treatment device coupled with sulfur autotrophic denitrification by AAO, characterized in that: It includes a regulating unit, an AAO unit and a sulfur autotrophic denitrification unit which are arranged in sequence; The regulating unit includes a regulating tank, which is used to homogenize the wastewater; the regulating tank is provided with a water inlet for inputting the wastewater; The AAO unit includes an anaerobic tank, an anoxic tank and an aerobic tank connected in sequence, and the AAO unit is used to remove COD, TN and TP in the wastewater; the regulating tank is connected to the anaerobic tank; The sulfur autotrophic denitrification unit includes an oxygen reduction tank, a sulfur autotrophic denitrification tank and a sedimentation tank connected in sequence; the aerobic tank is connected to the oxygen reduction tank; the oxygen reduction tank is used to reduce the dissolved oxygen concentration in the wastewater; the sulfur autotrophic denitrification tank is used to deeply treat TN in the wastewater; the sedimentation tank is used to precipitate the wastewater; and a drain outlet is provided on the sedimentation tank for discharging the treated wastewater.
2. The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification according to claim 1 is characterized in that: The regulating unit further includes an inlet pump and an inlet flow meter, which are sequentially arranged between the regulating tank and the anaerobic tank, and are used to jointly regulate the inlet flow of the wastewater entering the anaerobic tank.
3. The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification according to claim 1 is characterized in that: A first agitator is provided in the anaerobic tank, and a second agitator is provided in the anoxic tank.
4. The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification according to claim 1 is characterized in that: An air distribution device is provided in the aerobic pool; a fan is provided outside the aerobic pool, the fan is connected to the air distribution device, and the fan and the air distribution device are used to provide dissolved oxygen into the aerobic pool.
5. The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification according to claim 1 is characterized in that: The aerobic tank is connected to the anoxic tank via a pipeline through a wastewater reflux pump.
6. The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification according to claim 1 is characterized in that: A third agitator is provided in the oxygen reduction tank, and a fourth agitator is provided in the sulfur autotrophic denitrification tank.
7. The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification according to claim 1 is characterized in that: The sulfur autotrophic denitrification pool is also connected to a medicine storage pool, which is used to store sulfur sources, inorganic alkali and nutrient elements.
8. The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification according to claim 7, characterized in that: A dosing pump is further provided between the sulfur autotrophic denitrification tank and the drug storage tank, and the dosing pump is used to input the drug in the drug storage tank into the sulfur autotrophic denitrification tank; And / or, a fifth agitator is provided in the medicine storage tank.
9. The wastewater deep treatment device of AAO coupled sulfur autotrophic denitrification according to claim 1, characterized in that: The bottom of the sedimentation tank is provided with a sludge return port and a sludge discharge port respectively; the sludge return port is connected to the bottom of the anaerobic tank through a pipeline via a sludge return pump; the sludge discharge port is used to discharge sludge residue.
10. The wastewater deep treatment device according to any one of claims 1 to 9, characterized in that: The wastewater advanced treatment device further comprises an electric control cabinet, which is used to control the working status of each unit in the wastewater advanced treatment device.