A low-carbon sewage treatment method

Abstract

The present invention discloses a low-carbon sewage treatment method, which relates to the technical field of sewage treatment. The low-carbon sewage treatment method comprises the following steps: S1. Sewage enters an anaerobic zone through a first pipe for degradation of macromolecular pollutants and phosphorus release; S2. Water effluent from the anaerobic zone enters a first nitrification zone through a second pipe for oxidation of ammonia nitrogen; S3. Water effluent from the first nitrification zone enters a second nitrification zone through a first water hole for complete oxidation of ammonia nitrogen; the present invention forms a more pronounced ammonia nitrogen gradient by providing a baffle in the second nitrification zone, ensuring more thorough nitrification of ammonia nitrogen; utilizes equipment such as an online ammonia nitrogen monitor and an online dissolved oxygen monitor to monitor water quality parameters in real time, and implements automatic control through the automatic control logic of a fan and a carbon source dosing pump, avoiding misjudgments caused by traditional subjective experience; introduces fault judgment logic to automatically locate fault locations through multi-parameter linkage analysis, improving the maintainability and stability of the system.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a low-carbon sewage treatment method. Background Art

[0002] At present, the traditional sewage treatment method is mainly anaerobic-anoxic-aerobic (AAO). The incomplete oxidation of ammonia nitrogen at the front end results in low nitrate nitrogen utilization at the back end, and the denitrification and denitrification performance will also be low, thus affecting the overall sewage treatment effect.

[0003] The present invention provides a treatment process that follows the anaerobic-aerobic zone (second nitrification zone)-anoxic process. The installation of a baffle in the second nitrification zone can create a more pronounced ammonia-nitrogen gradient, ensuring more thorough nitrification of ammonia-nitrogen. This facilitates more substrate for denitrification in the back-end, ensuring overall wastewater denitrification effectiveness. Through the coordinated control of online instruments, misjudgments caused by traditional empirical judgments can be avoided, providing a reliable basis for production and predicting production conditions, thereby avoiding emergencies. Therefore, a low-carbon wastewater treatment method is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a low-carbon sewage treatment method that can overcome the above problems or at least partially solve the above problems.

[0005] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a low-carbon sewage treatment method, comprising the following steps:

[0006] S1. Sewage enters the anaerobic zone through pipe 1 for degradation of macromolecular pollutants and release of phosphorus;

[0007] S2, the effluent from the anaerobic zone enters the first nitrification zone through pipe 2 for oxidation of ammonia nitrogen;

[0008] S3, the effluent from the first nitrification zone enters the second nitrification zone through the water hole 1 to completely oxidize the ammonia nitrogen;

[0009] S4, the effluent from the second nitrification zone enters the anoxic zone through the second water hole for denitrification;

[0010] S5, the effluent from the anoxic zone enters the secondary sedimentation tank through pipe three;

[0011] S6. The sludge from the secondary sedimentation tank is returned to the anaerobic zone through pipe four.

[0012] Preferably, a baffle is provided in the second nitrification zone, and the baffle divides the second nitrification zone into zones A, B, C, and D, and the volumes of zones B, C, and D are all 0.8 to 1.2 times the volume of zone A.

[0013] Preferably, the baffle is made of a modified polymer material containing digestive enzymes.

[0014] Preferably, the second water hole is arranged on the wall of zone D of the second nitrification zone, and the sewage flows through zones A, B, C, and D in sequence and then flows to the anoxic zone through the second water hole.

[0015] Preferably, a flowmaker is provided in the anoxic zone, and the total power of the flowmaker is 2-5W per ton of water.

[0016] Furthermore, zone D of the second nitrification zone is provided with an online ammonia nitrogen monitor and an online dissolved oxygen monitor. The data of the online ammonia nitrogen monitor and the online dissolved oxygen monitor are used to control the fan, which is used to aerate the second nitrification zone. The specific control steps are as follows:

[0017] S7, obtaining the measured ammonia nitrogen value A1, obtaining the measured dissolved oxygen value B1;

[0018] Set the adjustable setpoints as follows:

[0019] A2: Ammonia nitrogen lower limit, mg / L; A3: Ammonia nitrogen upper limit, mg / L; A4: Low ammonia nitrogen alarm value,

[0020] mg / L; A5: high ammonia nitrogen alarm value, mg / L;

[0021] B2: Dissolved oxygen upper limit, mg / L; B3: Dissolved oxygen lower limit, mg / L; B4: Low dissolved oxygen alarm

[0022] Value, mg / L; B5: high dissolved oxygen alarm value, mg / L;

[0023] H1: fan frequency reduction, Hz;

[0024] H2: fan frequency increase, Hz;

[0025] T1: running time, min;

[0026] S8. Set the fan automatic control logic:

[0027] ①When A1≤A2, the fan operating frequency is reduced by H1 from the original frequency;

[0028] ② When A1≤A4, the fan operating frequency is reduced by 2 times H1 from the original frequency;

[0029] ③ When A1≥A3, the fan operating frequency increases by H2 from the original frequency;

[0030] ④When A1≥A5, the fan operating frequency increases by 2 times H2 from the original frequency;

[0031] ⑤When A4<A1<A2, the control steps are as follows:

[0032] When B3<B1<B2, the fan operating frequency remains unchanged;

[0033] When B1≤B3, the fan operating frequency increases by H2 from the original frequency;

[0034] When B1≥B2, the fan operating frequency is reduced by H2 from the original frequency;

[0035] ⑥After an interval of T1, repeat the above steps ①~⑤.

[0036] Furthermore, the anoxic zone is provided with an online nitrate nitrogen monitor and a carbon source dosing pump. The carbon source dosing pump is regulated according to the data of the online nitrate nitrogen monitor. The specific regulation steps are as follows:

[0037] S9, obtaining the measured nitrate nitrogen value C1 and the actual online flow rate Q1 of the carbon source dosing pump;

[0038] Set the adjustable setpoints as follows:

[0039] C2: Nitrate nitrogen set value, mg / L; C3: High nitrate nitrogen alarm value, mg / L; G1: Equivalent COD value of carbon source, mg / L; K1: Carbon source addition ratio; N1: Nitration solution reflux ratio, %

[0040] H3: reduction in the frequency of the carbon source dosing pump, Hz;

[0041] H4: frequency increase of carbon source dosing pump, Hz;

[0042] Q2: Theoretical calculation of carbon source dosage, L / h;

[0043] T2: running time, min;

[0044] S10. Set the automatic control logic of the carbon source dosing pump as follows:

[0045] ①When C1≤C2, the carbon source dosing pump stops running;

[0046] ② When C1>C2, the carbon source dosing pump starts, and the specific control steps are as follows:

[0047] Calculate Q2 = (C1-C2)*N1*K1*Q1*1000 / G1;

[0048] When Q1<Q2, the operating frequency of the carbon source dosing pump increases by H4 from the original frequency;

[0049] When Q1=Q2, the operating frequency of the carbon source dosing pump remains unchanged;

[0050] When Q1≥Q2, the operating frequency of the carbon source dosing pump is reduced by H3 from the original frequency;

[0051] ③After an interval of T2, repeat the above steps ①~②.

[0052] Furthermore, a and b values are provided, which are the ammonia nitrogen and dissolved oxygen benchmarks during normal operation;

[0053] To set the fault judgment logic, follow the steps below:

[0054] S11. When A1≈a and B1≈b in zones A, B, C, and D, there are no faults in zones A, B, C, and D;

[0055] S12. When A1≤0.2a and B1≤0.5b in zone A, B, C or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor, baffle or fan in the zone are faulty;

[0056] S13. When A1≥2a and B1≥2b in zone A, B, C or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor, damper or fan in the zone is faulty;

[0057] S14. When A1≈a and B1≤0.5b in zone A, B, C, or D, the online dissolved oxygen monitor in that zone is faulty or the fan is faulty. The fan fault can be verified by checking whether the dissolved oxygen values in the adjacent zones are normal and whether the fan current and power meet the standards.

[0058] S15. When A1≈a and B1≥2b in zone A, B, C, or D, the dissolved oxygen online monitor in that zone is faulty or the fan logic control is faulty. The fan fault can be checked by checking whether the fan is running continuously at high frequency.

[0059] S16. When A1≤0.2a and B1≈b in area A, B, C or D, the ammonia nitrogen online monitor in that area is faulty;

[0060] S17. When A1≥2a and B1≈b in zone A, B, C, or D, the ammonia nitrogen online monitor in that zone is faulty or the baffle is faulty;

[0061] S18. When A1≤0.2a and B1≥2b in zone A, B, C, or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor, or fan in that zone is faulty. If B1≥2b after replacing the sensors of the dissolved oxygen online monitor and ammonia nitrogen online monitor, the fan is determined to be faulty.

[0062] S19. When A1≥2a and B1≤0.5b in zone A, B, C or D, the baffle in the zone is faulty, the ammonia nitrogen online monitor is faulty, the dissolved oxygen online monitor is faulty or the fan is faulty.

[0063] Furthermore, when performing fault judgment in the above S13, S17, and S19, a water inlet load abnormality judgment formula is added;

[0064] (1) Assume is the ammonia nitrogen load fluctuation rate

[0065]

[0066] in, is the current influent ammonia nitrogen concentration (mg / L), The daily average ammonia nitrogen concentration in the influent over the past 7 days (mg / L);

[0067] like , it is determined that the ammonia nitrogen load of the influent is abnormal, and the threshold of ammonia nitrogen a is adjusted according to the process load. If If the standard is exceeded and A1 increases simultaneously, it is first determined to be an inlet shock. Inlet shock refers to a typical abnormal operating condition in the operation of the sewage treatment system, which means that the inlet water quality or water volume fluctuates violently in a short period of time, resulting in a serious imbalance between the system's treatment capacity and actual load;

[0068] (2) Assume is the dissolved oxygen demand load fluctuation rate

[0069]

[0070] in, is the current water inflow (m³ / h), is the current ammonia nitrogen load (kg / h), is the daily average value of ammonia nitrogen load in the past 7 days (kg / h);

[0071] like , it is determined to be an influent ammonia nitrogen load shock;

[0072] Adjust the threshold of dissolved oxygen b according to the process load. If the standard is exceeded and B1 is significantly reduced, it is preferentially determined that the fan is insufficiently supplying oxygen.

[0073] Furthermore, when performing fault judgment in the above S13, S17, and S19, a historical data trend comparison formula is added;

[0074] (1) Assume is the ammonia nitrogen / dissolved oxygen trend deviation

[0075]

[0076] in, is the ammonia nitrogen (A1) or dissolved oxygen (B1) value at the current moment or in the past n cycles, with the cycle set to 1 hour. It is the average of the same period in history. The same period in history is set as the same period in the past 30 days. is the standard deviation of the historical period;

[0077] like , that is, the current value deviates from the historical mean by 2 times the standard deviation, which is judged as abnormal fluctuation;

[0078] like If the standard is exceeded and there is no abnormal water load, it is preferentially determined that the ammonia nitrogen online monitor or fan is faulty.

[0079] (2) Assume Gradient consistency check

[0080]

[0081] in, is the ammonia nitrogen value of the current partition, is the ammonia nitrogen value of the upstream partition, 、 It is the historical average for the same period;

[0082] like , that is, the current gradient deviates from the historical gradient by more than 10%, which is judged to be a baffle failure or mixing anomaly. If the standard is exceeded and the water inlet load is normal, it is preferentially determined to be a baffle short circuit.

[0083] Furthermore, the baffle is composed of a first baffle layer and a second baffle layer. The first baffle layer is arranged to be lifted. Ultrasonic generators and jet tubes are respectively installed in the A, B, C, and D areas. The jet tubes are provided with a plurality of jet holes. When the jet tubes are immersed in water, the jet holes are tilted upward toward the baffle, so that the gas pushes the water flow to flush the first baffle layer.

[0084] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: by setting a baffle in the second nitrification zone, the present invention can form a more obvious ammonia nitrogen gradient, ensuring more thorough nitrification of ammonia nitrogen; using equipment such as an ammonia nitrogen online monitor and a dissolved oxygen online monitor to monitor water quality parameters in real time, and realizing automatic regulation through the automatic control logic of the fan and carbon source dosing pump, thereby avoiding misjudgment caused by traditional subjective experience; introducing fault judgment logic, through multi-parameter linkage analysis, automatically locates the fault location, and improves the maintainability and stability of the system; through historical data trend comparison and water load abnormality judgment, the system's anti-interference ability and fault diagnosis accuracy are further improved; this low-carbon sewage treatment method significantly improves sewage treatment efficiency and quality through technological innovation and intelligent control, reduces energy consumption and operating costs, and enhances the adaptability and maintainability of the system, with significant economic and social benefits; among them, the fault judgment used for the baffle can further improve the sustainable performance of the baffle in the second nitrification zone, thereby effectively maintaining the ammonia nitrogen gradient effect formed in the second nitrification zone for a long time, thereby improving the efficiency and performance of sewage treatment.

[0085] 1. This low-carbon wastewater treatment method: A baffle is installed within the second nitrification zone, dividing it into zones A, B, C, and D. The volumes of zones B, C, and D are all 0.8 to 1.2 times that of zone A. Zone A serves as the core, high-load nitrification zone, prioritizing the high concentrations of ammonia nitrogen in the effluent from the first nitrification zone. Zones B, C, and D serve as deep nitrification buffer zones, with similar volumes designed to disperse peak ammonia nitrogen loads and avoid overloading microbial metabolism in a single zone. The volume of zones B, C, and D is designed so that when the ammonia nitrogen concentration in the influent fluctuates, zone A can bear the instantaneous high load. Zones B, C, and D maintain system stability through redundant volume, reducing fluctuations in the total nitrogen removal rate.

[0086] 2. This low-carbon sewage treatment method: By adjusting the frequency of the carbon source dosing pump in real time according to the nitrate nitrogen value, it can ensure that the denitrifying bacteria are always in an efficient metabolic state, while avoiding waste due to excessive addition of carbon source, which can effectively save operating costs. At the same time, the increase or decrease in the frequency of the carbon source dosing pump can also stabilize the effluent water quality, avoid the risk of exceeding the standard, and optimize the microbial community, thereby improving the stability of the sewage treatment system. Monitoring the nitrate nitrogen value through the nitrate nitrogen online monitor can effectively reduce manual intervention and operation and maintenance costs, and automation replaces manual detection of nitrate nitrogen values. Therefore, real-time regulation of the carbon source dosing pump is the core technical means for sewage treatment plants to achieve "quality improvement and efficiency enhancement". Through the three-dimensional optimization of process-cost-safety, it can bring significant economic and environmental benefits to enterprises.

[0087] 3. This low-carbon sewage treatment method: In the sewage treatment process, fault judgment logic is added. Through refined zoning monitoring and multi-parameter linkage analysis, the accuracy, timeliness and maintainability of system fault diagnosis are significantly improved, filling the blind spots of fault diagnosis of traditional methods in low DO environments, and effectively improving positioning accuracy.

[0088] 4. This low-carbon sewage treatment method: In logical judgments such as S13 (A1 ≥ 2a, B1 ≥ 2b), S17 (A1 ≥ 2a, B1 ≈ b), and S19 (A1 ≥ 2a, B1 ≤ 0.5b), priority is given to eliminating water inlet shock interference by comparing abnormal water inlet load judgment with historical data trends, thereby shortening fault location time and reducing unnecessary downtime.

[0089] 5. The low-carbon sewage treatment method: When it is determined that the baffle is faulty, the ultrasonic generator and the jet pipe can be brought close to the baffle, and the water can be rippled by the ultrasonic generator. The water ripples can be used to clean the baffle surface to eliminate the baffle failure caused by the blockage problem. The jet pipe can be brought close to the baffle and immersed in water, and the jet can be sprayed outward through the jet pipe to further clean the surface of the first layer of the baffle.

[0090] 6. This low-carbon wastewater treatment method: Areas A, B, C, and D are each equipped with additional winches. The first layer of baffles in these areas is raised and lowered by the winches. When a baffle is detected as faulty, the winches lift the first layer, and the surface of the raised first layer is cleaned using an ultrasonic generator and an air jet. Since the water in the second nitrification zone flows from area A to area D, dirt in areas A, B, C, and D is more concentrated on the first layer, while dirt is less on the second layer. Therefore, by lifting the first layer and cleaning it during the lifting process, the second layer remains functional. This allows the cause of the blockage to be eliminated first by cleaning, or the first layer to be cleaned while the second layer is in use. During the lifting process, the first layer gradually leaves the water surface and is cleaned by the ultrasonic generator and air jet, preventing secondary contamination and maintaining a cleansing effect.

[0091] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] In the attached figure:

[0093] Figure 1 This is a schematic flow chart of a low-carbon sewage treatment method proposed in the present invention;

[0094] Figure 2 This is a schematic structural diagram of the jet pipe and jet hole of a low-carbon sewage treatment method proposed in the present invention;

[0095] Figure 3 This is a schematic structural diagram of a water perforation in a low-carbon sewage treatment method proposed in the present invention.

[0096] In the figure: 10, ultrasonic generator; 20, air jet tube; 201, air jet hole; 3, baffle; 301, first layer of baffle; 302, second layer of baffle; 303, water hole;

[0097] 11. Anaerobic zone; 110. Pipeline 1;

[0098] 12. First nitrification zone; 121. Pipeline 2; 122. Water hole 1;

[0099] 13. Second nitrification zone; 131. Second water hole;

[0100] 14. Anoxic zone; 141. Pipeline three;

[0101] 15. Second sedimentation tank; 151. Pipeline 4;

[0102] 16. Flow pusher. DETAILED DESCRIPTION

[0103] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0104] The following is combined with Figure 1 -Attached Figure 3 , describes in detail the technical solutions provided by each embodiment of the present invention.

[0105] Example 1: Reference Figure 1-Figure 2 , a low-carbon sewage treatment method, comprising the following steps:

[0106] S1. Sewage enters the anaerobic zone 11 through pipe 110 for degradation of macromolecular pollutants and phosphorus release;

[0107] S2, the effluent from the anaerobic zone 11 enters the first nitrification zone 12 through the second pipe 121 for oxidation of ammonia nitrogen;

[0108] S3, the effluent from the first nitrification zone 12 enters the second nitrification zone 13 through the water hole 122 to completely oxidize the ammonia nitrogen;

[0109] S4, the effluent from the second nitrification zone 13 enters the anoxic zone 14 through the second water hole 131 for denitrification and denitrification;

[0110] S5, the effluent from the anoxic zone 14 enters the secondary sedimentation tank 15 through the pipe 3 141;

[0111] S6. The sludge from the secondary sedimentation tank 15 is returned to the anaerobic zone 11 through the pipe 4 151.

[0112] In the above treatment method, the phosphorus release in the anaerobic zone 11 is coupled with the denitrification and phosphorus removal in the anoxic zone 14 to achieve "one carbon for two uses", breaking through the contradiction in carbon source allocation in traditional processes. The first and second nitrification zones 13 ensure the complete oxidation of ammonia nitrogen and avoid the inhibition of denitrifying bacteria by nitrite accumulation. This process is suitable for upgrading and transformation of urban sewage treatment plants, comprehensive wastewater treatment in industrial parks, and decentralized sewage treatment in rural areas.

[0113] A baffle 3 is provided in the second nitrification zone 13, which divides the second nitrification zone 13 into zones A, B, C, and D. The volumes of zones B, C, and D are all 0.8 to 1.2 times the volume of zone A.

[0114] Zone A, the core high-load nitrification zone, prioritizes the high concentrations of ammonia nitrogen in the effluent from Zone 12. Zones B, C, and D, serving as deep nitrification buffer zones, are designed with similar volumes to disperse peak ammonia nitrogen loads and avoid overloading microbial metabolism in a single area. The volumes of Zones B, C, and D are configured so that Zone A can handle transient high loads when influent ammonia nitrogen concentrations fluctuate. The redundant volumes in Zones B, C, and D maintain system stability and reduce fluctuations in total nitrogen removal rates.

[0115] At the same time, a more obvious ammonia nitrogen gradient can be formed, ensuring a more thorough nitrification of ammonia nitrogen, which is beneficial for the denitrification and denitrification at the back end to have more reaction substrates, thus ensuring the overall sewage denitrification effect;

[0116] Among them, areas A, B, C, and D all support independent aeration control.

[0117] The material is a modified polymer material containing digestive enzymes;

[0118] A modified polymer material containing digestive enzymes is introduced into the baffle 3 in the second nitrification zone 13 to eliminate competition for organic nitrogen, reduce the consumption of DO by heterotrophic bacteria, quickly decompose toxic substances such as hydroxylamine, and protect NOB activity. The synergistic effect of enzymatic pretreatment and microbial metabolism significantly improves nitrification efficiency, reduces energy consumption, and enhances system stability.

[0119] The second water hole 131 is set on the wall of the D zone of the second nitrification zone 13. After the sewage passes through the A, B, C, and D zones in sequence, it flows to the anoxic zone 14 through the second water hole 131. The second water hole 131 is opened horizontally.

[0120] A flow maker 16 is provided in the anoxic zone 14. The total power of the flow maker 16 is 2-5W per ton of water. Since the anoxic zone 14 often has uneven flow patterns, resulting in DO residue or uneven distribution of carbon sources, the setting of the flow maker 16 can increase the flow rate through forced convection, reduce the dead zone volume ratio, and ensure that the denitrifying bacteria are in full contact with the carbon source.

[0121] Example 2: A low-carbon wastewater treatment method is basically the same as Example 1, but further comprises: an ammonia nitrogen online monitor and a dissolved oxygen online monitor are provided in zone D of the second nitrification zone 13. The data of the ammonia nitrogen online monitor and the dissolved oxygen online monitor are used to control the fan, which is used to aerate the second nitrification zone 13. The specific control steps are as follows:

[0122] S7, obtaining the measured ammonia nitrogen value A1, obtaining the measured dissolved oxygen value B1;

[0123] Set the adjustable setpoints as follows:

[0124] A2: Ammonia nitrogen lower limit, mg / L; A3: Ammonia nitrogen upper limit, mg / L; A4: Low ammonia nitrogen alarm value,

[0125] mg / L; A5: high ammonia nitrogen alarm value, mg / L;

[0126] B2: Dissolved oxygen upper limit, mg / L; B3: Dissolved oxygen lower limit, mg / L; B4: Low dissolved oxygen alarm

[0127] Value, mg / L; B5: high dissolved oxygen alarm value, mg / L;

[0128] H1: fan frequency reduction, Hz, reduces aeration volume;

[0129] H2: Increase in fan frequency, Hz, increases aeration volume;

[0130] T1: running time, min;

[0131] S8. Set the fan automatic control logic:

[0132] ①When A1≤A2, the fan operating frequency is reduced by H1 from the original frequency;

[0133] ② When A1≤A4, the fan operating frequency is reduced by 2 times H1 from the original frequency;

[0134] ③ When A1≥A3, the fan operating frequency increases by H2 from the original frequency;

[0135] ④When A1≥A5, the fan operating frequency increases by 2 times H2 from the original frequency;

[0136] ⑤When A4<A1<A2, the control steps are as follows:

[0137] When B3<B1<B2, the fan operating frequency remains unchanged;

[0138] When B1≤B3, the fan operating frequency increases by H2 from the original frequency;

[0139] When B1≥B2, the fan operating frequency is reduced by H2 from the original frequency;

[0140] ⑥After an interval of T1, repeat the above steps ①~⑤.

[0141] An online nitrate nitrogen monitor and a carbon source dosing pump are provided in the anoxic zone 14. The carbon source dosing pump is regulated according to the data from the online nitrate nitrogen monitor. The specific regulation steps are as follows:

[0142] S9, obtaining the measured nitrate nitrogen value C1 and the actual online flow rate Q1 of the carbon source dosing pump;

[0143] Set the adjustable setpoints as follows:

[0144] C2: Nitrate nitrogen set value, mg / L; C3: High nitrate nitrogen alarm value, mg / L; G1: Equivalent COD value of carbon source, mg / L; K1: Carbon source addition ratio; N1: Nitration solution reflux ratio, %

[0145] H3: reduction in the frequency of the carbon source dosing pump, Hz;

[0146] H4: frequency increase of carbon source dosing pump, Hz;

[0147] Q2: Theoretical calculation of carbon source dosage, L / h;

[0148] T2: running time, min;

[0149] S10. Set the automatic control logic of the carbon source dosing pump as follows:

[0150] ①When C1≤C2, the carbon source dosing pump stops running;

[0151] ② When C1>C2, the carbon source dosing pump starts, and the specific control steps are as follows:

[0152] Calculate Q2 = (C1-C2)*N1*K1*Q1*1000 / G1;

[0153] When Q1<Q2, the operating frequency of the carbon source dosing pump increases by H4 from the original frequency;

[0154] When Q1=Q2, the operating frequency of the carbon source dosing pump remains unchanged;

[0155] When Q1≥Q2, the operating frequency of the carbon source dosing pump is reduced by H3 from the original frequency;

[0156] ③After an interval of T2, repeat the above steps ①~②;

[0157] By adjusting the frequency of the carbon source dosing pump in real time according to the nitrate nitrogen value, it is possible to ensure that the denitrifying bacteria are always in an efficient metabolic state, while avoiding waste due to excessive addition of carbon source, which can effectively save operating costs. At the same time, the increase or decrease in the frequency of the carbon source dosing pump can also stabilize the effluent water quality, avoid the risk of exceeding the standard, and optimize the microbial community, thereby improving the stability of the sewage treatment system. Monitoring the nitrate nitrogen value through the nitrate nitrogen online monitor can effectively reduce manual intervention and operation and maintenance costs, and automation replaces manual detection of nitrate nitrogen values. Therefore, real-time regulation of the carbon source dosing pump is the core technical means for sewage treatment plants to achieve "quality improvement and efficiency enhancement". Through the three-dimensional optimization of process-cost-safety, it can bring significant economic and environmental benefits to enterprises.

[0158] Example 3: A low-carbon wastewater treatment method is basically the same as Example 2, further comprising: setting a and b values, where a and b values are the ammonia nitrogen and dissolved oxygen benchmarks during normal operation;

[0159] To set the fault judgment logic, follow the steps below:

[0160] S11. When A1≈a and B1≈b in zones A, B, C, and D, there are no faults in zones A, B, C, and D;

[0161] S12. When A1≤0.2a and B1≤0.5b in zone A or B or C or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor or fan failure in the zone is faulty;

[0162] S13. When A1 ≥ 2a and B1 ≥ 2b in zone A or B or C or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor or fan failure in the zone is faulty;

[0163] S14. When A1≈a and B1≤0.5b in zone A, B, C, or D, the online dissolved oxygen monitor in that zone is faulty or the fan is faulty. The fan fault can be verified by checking whether the dissolved oxygen values in the adjacent zones are normal and whether the fan current and power meet the standards.

[0164] S15. When A1≈a and B1≥2b in zone A, B, C, or D, the dissolved oxygen online monitor in that zone is faulty or the fan logic control is faulty. The fan fault can be checked by checking whether the fan is running continuously at high frequency.

[0165] S16. When A1≤0.2a and B1≈b in area A, B, C or D, the ammonia nitrogen online monitor in the area is faulty and can automatically locate the fault.

[0166] S17. When A1 ≥ 2a and B1 ≈ b in zone A or B or C or D, the ammonia nitrogen online monitor in that zone is faulty or out of order;

[0167] S18. When A1≤0.2a and B1≥2b in zone A, B, C, or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor, or fan in that zone is faulty. If B1≥2b after replacing the sensors of the dissolved oxygen online monitor and ammonia nitrogen online monitor, the fan is determined to be faulty.

[0168] S19. When A1≥2a and B1≤0.5b in zone A, B, C or D, the baffle 3 in the zone is faulty, the ammonia nitrogen online monitor is faulty, the dissolved oxygen online monitor is faulty or the fan is faulty.

[0169] In the sewage treatment process, fault judgment logic is added. Through refined zoning monitoring and multi-parameter linkage analysis, the accuracy, timeliness and maintainability of system fault diagnosis are significantly improved, filling the blind spots of fault diagnosis of traditional methods in low DO environments and effectively improving positioning accuracy.

[0170] Example 4: A low-carbon sewage treatment method is basically the same as Example 3, but further comprises: before the fault judgment is performed in the above-mentioned S13, S17, and S19, a water inlet load abnormality judgment method is added to first eliminate whether there is a water inlet load abnormality in steps S13, S17, and S19, thereby improving the accuracy of the judgments in S13, S17, and S19; wherein the water inlet load abnormality is water inlet shock, which refers to a typical abnormal operating condition in the operation of the sewage treatment system, that is, the water quality or water volume of the water inlet fluctuates violently in a short period of time, resulting in a serious imbalance between the system treatment capacity and the actual load;

[0171] Formula for judging abnormal inlet load;

[0172] (1) Assume is the ammonia nitrogen load fluctuation rate

[0173]

[0174] in, is the current influent ammonia nitrogen concentration (mg / L), The daily average ammonia nitrogen concentration in the influent over the past 7 days (mg / L);

[0175] like , it is determined that the ammonia nitrogen load of the influent is abnormal, and the threshold of ammonia nitrogen a is adjusted according to the process load. If If the standard is exceeded and A1 increases simultaneously, it is first determined to be water inflow shock;

[0176] By comparing the current influent ammonia nitrogen concentration with the daily average of the past 7 days, if the fluctuation rate exceeds the set threshold, it is determined that the influent ammonia nitrogen load is abnormal, and the baseline value a is dynamically adjusted to avoid the false high ammonia nitrogen value A1 caused by influent shock being misjudged as a sensor or fault.

[0177] (2) Assume is the dissolved oxygen demand load fluctuation rate

[0178]

[0179] in, is the current water inflow (m³ / h), is the current ammonia nitrogen load (kg / h), is the daily average value of ammonia nitrogen load in the past 7 days (kg / h);

[0180] like , it is determined to be an influent ammonia nitrogen load shock;

[0181] Adjust the threshold of dissolved oxygen b according to the process load. If the standard is exceeded and B1 is significantly reduced, it is preferentially determined that the fan is insufficiently supplying oxygen.

[0182] Combined with the influent volume Q and compared with the daily average value of the past 7 days, if the fluctuation rate exceeds the threshold, it is determined to be an influent ammonia nitrogen load shock, and the baseline value b is dynamically adjusted to avoid the false low dissolved oxygen value B1 caused by sudden load changes and misjudged as a fan failure.

[0183] Example 5: A low-carbon wastewater treatment method is basically the same as Example 4, and further comprises: adding a historical data trend comparison formula when performing fault judgment in the above S13, S17, and S19;

[0184] (1) Assume is the ammonia nitrogen / dissolved oxygen trend deviation

[0185]

[0186] in, is the ammonia nitrogen (A1) or dissolved oxygen (B1) value at the current moment or in the past n cycles, with the cycle set to 1 hour. It is the average of the same period in history. The same period in history is set as the same period in the past 30 days. is the standard deviation of the historical period;

[0187] like , that is, the current value deviates from the historical mean by 2 times the standard deviation, which is judged as abnormal fluctuation;

[0188] like If the standard is exceeded and there is no abnormal water load, it is preferentially determined to be a failure of the ammonia nitrogen online monitor or the fan;

[0189] By comparing the current value with the mean and standard deviation of the same period in the past 30 days, if the deviation If the fluctuation exceeds 2 times the standard deviation, it is considered an abnormal fluctuation. This method can effectively filter out short-term fluctuations caused by environmental factors such as inlet water temperature and pH, avoiding misjudgment.

[0190] (2) Assume Gradient consistency check

[0191]

[0192] in, is the ammonia nitrogen value of the current partition, is the ammonia nitrogen value of the upstream partition, 、 It is the historical average for the same period;

[0193] like , that is, the current gradient deviates from the historical gradient by more than 10%, which is judged as a fault or mixed abnormality. If the standard is exceeded and the water inlet load is normal, it is first determined to be a short circuit;

[0194] By comparing the ammonia nitrogen values and historical gradient averages of the current zone with those of upstream zones, if the gradient deviation exceeds 10%, it is determined to be a short circuit or mixed anomaly. This method can distinguish local faults from global load fluctuations, avoiding missed faults.

[0195] Therefore, the introduction of abnormal water load judgment and comparative analysis of historical data trends can further improve the accuracy of fault judgment and significantly enhance the anti-interference ability, fault diagnosis accuracy and process stability of the low-carbon sewage treatment system under complex working conditions.

[0196] In summary, in logical judgments such as S13 (A1 ≥ 2a, B1 ≥ 2b), S17 (A1 ≥ 2a, B1 ≈ b), and S19 (A1 ≥ 2a, B1 ≤ 0.5b), priority should be given to eliminating water inflow shock interference by comparing abnormal water inflow load judgment with historical data trends, thereby shortening fault location time and reducing unnecessary downtime.

[0197] Example 6: Reference Figure 1 、 Figure 2 A low-carbon sewage treatment method is basically the same as Example 5, and further comprises: a first baffle layer 301 and a second baffle layer 302, the first baffle layer 301 is arranged to be lifted, and ultrasonic generators 10 and air jets 20 are respectively installed in areas A, B, C, and D, and a plurality of air jet holes 201 are opened on the air jet 20 at equal intervals.

[0198] Independently controlled X-axis and Y-axis lead screws are installed in areas A, B, C, and D respectively. The X-axis and Y-axis lead screws are threadedly connected to the lead screw seats. It should be understood that the X-axis and Y-axis lead screws are covered with protective sleeves to prevent lead screw corrosion.

[0199] A winch is installed on the wire seat, and the ultrasonic generator 10 and the air injection tube 20 are installed on the connecting frame on the lifting rope of the winch;

[0200] The ultrasonic generator 10 and the air jet 20 are driven to move in the A, B, C or D area through the X and Y axis screw rods; and the ultrasonic generator 10 and the air jet 20 are controlled to rise and fall through the winch;

[0201] When a fault is determined, the ultrasonic generator 10 and the air jet tube 20 can be brought close together, the ultrasonic generator 10 can be used to make the water fluctuate, and the water fluctuation can be used to clean the surface to eliminate the fault caused by the blockage problem. The air jet tube 20 can be brought close together and immersed in the water, and the air can be ejected outward through the air jet tube 20 to further clean the surface of the first layer 301 of the baffle.

[0202] Furthermore, additional hoisting equipment is installed in areas A, B, C, and D, respectively. The first layer 301 of the baffle in areas A, B, C, and D is controlled to rise and fall by the provided hoisting equipment. When a fault is determined, the first layer 301 of the baffle is pulled up by the hoisting equipment, and the surface of the raised first layer 301 of the baffle is cleaned in combination with the ultrasonic generator 10 and the air jet tube 20 (it should be understood that the lifting speed is adjustable). Since the water flow in the second nitrification zone 13 flows from area A to area D, the dirt in areas A, B, C, and D is more concentrated on the first layer 301 of the baffle, and there is less dirt on the second layer 302 of the baffle. Therefore, by raising the first layer 301 of the baffle and cleaning it during the raising process, the second layer 302 of the baffle can still function. This allows the cause of the blockage to be eliminated by cleaning first when a fault occurs, or the first layer 301 of the baffle can be cleaned while the second layer 302 of the baffle is being used.

[0203] When the first baffle layer 301 is being raised, the ultrasonic generator 10 and the air jet tube 20 are cleaning it. Since the first baffle layer 301 will gradually leave the water surface, it will not be contaminated again, and thus the cleaning effect can be maintained.

[0204] If necessary, the first baffle layer 301 and the second baffle layer 302 can be replaced.

[0205] In some embodiments, reference Figure 3 The first baffle layer 301 and the second baffle layer 302 are arranged in a telescopic manner. Specifically, an inner concave chute is opened in the first baffle layer 301, and the upper end of the inner concave chute is through-shaped. The second baffle layer 302 is slidably connected to the inner concave chute of the first baffle layer 301. Water holes 303 are opened on the first baffle layer 301 and the second baffle layer 302.

[0206] During normal use, water overflows from the second baffle layer 302, and the second baffle layer 302 can be raised and lowered by a set winch. When the second baffle layer 302 is raised, the water holes 303 overlap and connect, so that the water in the second nitrification zone 13 can continue to circulate without affecting use.

[0207] In this embodiment, microorganisms such as moss and lichen are attached to the first baffle layer 301 and the second baffle layer 302 .

[0208] Therefore, when the baffle 3 fails, the first baffle layer 301 can be lifted for inspection, maintenance or replacement, thereby ensuring the continuity of the ammonia nitrogen gradient effect formed in the second nitrification zone 13, thereby improving the sewage treatment effect.

[0209] The present invention can form a more obvious ammonia nitrogen gradient by setting in the second nitrification zone 13, thereby ensuring more thorough nitrification of ammonia nitrogen; utilizes equipment such as an ammonia nitrogen online monitor and a dissolved oxygen online monitor to monitor water quality parameters in real time, and realizes automatic regulation through the automatic control logic of the fan and the carbon source dosing pump, thereby avoiding misjudgment caused by traditional subjective experience; introduces fault judgment logic, and automatically locates the fault position through multi-parameter linkage analysis, thereby improving the maintainability and stability of the system; through historical data trend comparison and water inlet load abnormality judgment, further improves the system's anti-interference ability and fault diagnosis accuracy; this low-carbon sewage treatment method significantly improves sewage treatment efficiency and quality, reduces energy consumption and operating costs, and enhances the adaptability and maintainability of the system through technological innovation and intelligent control, and has significant economic and social benefits.

[0210] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A low-carbon sewage treatment method, characterized in that: The following steps are involved: S1, sewage enters the anaerobic zone (11) through pipe 1 (110) for degradation of macromolecular pollutants and release of phosphorus; S2, the effluent from the anaerobic zone (11) enters the first nitrification zone (12) through the second pipe (121) for oxidation of ammonia nitrogen; S3, the effluent from the first nitrification zone (12) enters the second nitrification zone (13) through the water hole 1 (122) to completely oxidize the ammonia nitrogen; S4, the effluent from the second nitrification zone (13) enters the anoxic zone (14) through the second water hole (131) for denitrification and denitrification; The effluent from S5, the anoxic zone (14), enters the secondary sedimentation tank (15) through pipe three (141); S6, the sludge from the secondary sedimentation tank (15) is returned to the anaerobic zone (11) through pipe four (151); A baffle (3) is provided in the second nitrification zone (13), and the baffle (3) divides the second nitrification zone (13) into zones A, B, C, and D, wherein the volumes of zones B, C, and D are all 0.8 to 1.2 times the volume of zone A; Zone D of the second nitrification zone (13) is provided with an ammonia nitrogen online monitor and a dissolved oxygen online monitor. The data of the ammonia nitrogen online monitor and the dissolved oxygen online monitor are used to control the blower. The blower is used to aerate the second nitrification zone (13) to obtain the measured ammonia nitrogen value A1 and the measured dissolved oxygen value B1; There are a and b values, which are the ammonia nitrogen and dissolved oxygen benchmarks during normal operation; To set the fault judgment logic, follow the steps below: S11. When A1≈a and B1≈b in zones A, B, C, and D, there are no faults in zones A, B, C, and D; S12. When A1≤0.2a and B1≤0.5b in zone A, B, C or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor, baffle (3) or fan in the zone is faulty; S13. When A1≥2a and B1≥2b in zone A, B, C or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor, baffle (3) or fan in the zone is faulty; S14. When A1≈a and B1≤0.5b in zone A, B, C, or D, the online dissolved oxygen monitor in that zone is faulty or the fan is faulty. The fan fault can be verified by checking whether the dissolved oxygen values in the adjacent zones are normal and whether the fan current and power meet the standards. S15. When A1≈a and B1≥2b in zone A, B, C, or D, the dissolved oxygen online monitor in that zone is faulty or the fan logic control is faulty. The fan fault can be checked by checking whether the fan is running continuously at high frequency. S16. When A1≤0.2a and B1≈b in area A, B, C or D, the ammonia nitrogen online monitor in that area is faulty; S17. When A1≥2a and B1≈b in zone A, B, C, or D, the ammonia nitrogen online monitor in that zone is faulty or the baffle (3) is faulty; S18. When A1≤0.2a and B1≥2b in zone A, B, C, or D, the ammonia nitrogen online monitor, dissolved oxygen online monitor, or fan in that zone is faulty. If B1≥2b after replacing the sensors of the dissolved oxygen online monitor and ammonia nitrogen online monitor, the fan is determined to be faulty. S19. When A1≥2a and B1≤0.5b in zone A, B, C or D, the baffle (3) in the zone is faulty, the ammonia nitrogen online monitor is faulty, the dissolved oxygen online monitor is faulty or the fan is faulty.

2. A low-carbon sewage treatment method according to claim 1, characterized in that: The baffle (3) is made of a modified polymer material containing digestive enzymes.

3. A low-carbon sewage treatment method according to claim 1, characterized in that: The second water hole (131) is provided on the wall of zone D of the second nitrification zone (13). After the sewage passes through zones A, B, C, and D in sequence, it flows through the second water hole (131) to the anoxic zone (14).

4. A low-carbon sewage treatment method according to claim 1, characterized in that: A flow pusher (16) is provided in the anoxic zone (14), and the total power of the flow pusher (16) is 2-5W per ton of water.

5. A low-carbon sewage treatment method according to claim 1, characterized in that: The specific control steps of zone D of the second nitrification zone (13) are as follows: S7, obtaining the measured ammonia nitrogen value A1, obtaining the measured dissolved oxygen value B1; Set the adjustable setpoints as follows: A2: Ammonia nitrogen lower limit, mg / L; A3: Ammonia nitrogen upper limit, mg / L; A4: Low ammonia nitrogen alarm value, mg / L; A5: high ammonia nitrogen alarm value, mg / L; B2: Dissolved oxygen upper limit, mg / L; B3: Dissolved oxygen lower limit, mg / L; B4: Low dissolved oxygen alarm Value, mg / L; B5: high dissolved oxygen alarm value, mg / L; H1: fan frequency reduction, Hz; H2: fan frequency increase, Hz; T1: running time, min; S8. Set the fan automatic control logic: ①When A1≤A2, the fan operating frequency is reduced by H1 from the original frequency; ② When A1≤A4, the fan operating frequency is reduced by 2 times H1 from the original frequency; ③ When A1≥A3, the fan operating frequency increases by H2 from the original frequency; ④When A1≥A5, the fan operating frequency increases by 2 times H2 from the original frequency; ⑤When A4<A1<A2, the control steps are as follows: When B3<B1<B2, the fan operating frequency remains unchanged; When B1≤B3, the fan operating frequency increases by H2 from the original frequency; When B1≥B2, the fan operating frequency is reduced by H2 from the original frequency; ⑥After an interval of T1, repeat the above steps ①~⑤.

6. A low-carbon sewage treatment method according to claim 1, characterized in that: The anoxic zone (14) is provided with a nitrate nitrogen online monitor and a carbon source dosing pump. The carbon source dosing pump is regulated according to the data of the nitrate nitrogen online monitor. The specific regulation steps are as follows: S9, obtaining the measured nitrate nitrogen value C1 and the actual online flow rate Q1 of the carbon source dosing pump; Set the adjustable setpoints as follows: C2: Nitrate nitrogen set value, mg / L; C3: High nitrate nitrogen alarm value, mg / L; G1: Equivalent COD value of carbon source, mg / L; K1: Carbon source addition ratio; N1: Nitration solution reflux ratio, % H3: reduction in the frequency of the carbon source dosing pump, Hz; H4: frequency increase of carbon source dosing pump, Hz; Q2: Theoretical calculation of carbon source dosage, L / h; T2: running time, min; S10. Set the automatic control logic of the carbon source dosing pump as follows: ①When C1≤C2, the carbon source dosing pump stops running; ② When C1>C2, the carbon source dosing pump starts, and the specific control steps are as follows: Calculate Q2 = (C1-C2)*N1*K1*Q1*1000 / G1; When Q1<Q2, the operating frequency of the carbon source dosing pump increases by H4 from the original frequency; When Q1=Q2, the operating frequency of the carbon source dosing pump remains unchanged; When Q1≥Q2, the operating frequency of the carbon source dosing pump is reduced by H3 from the original frequency; ③After an interval of T2, repeat the above steps ①~②.

7. A low-carbon sewage treatment method according to claim 1, characterized in that: When performing fault judgment in the above S13, S17, and S19, a water inlet load abnormality judgment formula is added; (1) Assume is the ammonia nitrogen load fluctuation rate ， in, is the current influent ammonia nitrogen concentration (mg / L), The daily average ammonia nitrogen concentration in the influent over the past 7 days (mg / L); like , it is determined that the influent ammonia nitrogen load is abnormal; (2) Assume is the dissolved oxygen demand load fluctuation rate ， in, is the current water inflow (m³ / h), is the current ammonia nitrogen load (kg / h), is the daily average value of ammonia nitrogen load in the past 7 days (kg / h); like , it was determined to be an influent ammonia nitrogen load shock.

8. A low-carbon sewage treatment method according to claim 7, characterized in that: In the above S13, When S17 and S19 perform fault judgment, a historical data trend comparison formula is added; (1) Assume is the ammonia nitrogen / dissolved oxygen trend deviation ， in, is the ammonia nitrogen (A1) or dissolved oxygen (B1) value at the current moment or in the past n cycles, is the historical average for the same period. is the standard deviation of the historical period; like , that is, the current value deviates from the historical mean by 2 times the standard deviation, which is judged as abnormal fluctuation; (2) Assume Gradient consistency check ， in, is the ammonia nitrogen value of the current partition, is the ammonia nitrogen value of the upstream zone, 、 It is the historical average for the same period; like , that is, the current gradient deviates from the historical gradient by more than 10%, which is judged to be a baffle (3) failure or mixing anomaly.

9. A low-carbon sewage treatment method according to claim 7, characterized in that: The baffle (3) is composed of a first baffle layer (301) and a second baffle layer (302). The first baffle layer (301) is arranged to be lifted. Ultrasonic generators (10) and air jet pipes (20) are respectively installed in the A, B, C, and D zones.

10. A low-carbon sewage treatment method according to claim 7, characterized in that: The baffle (3) is composed of a first baffle layer (301) and a second baffle layer (302); the second baffle layer (302) is slidably connected to the first baffle layer (301); water holes (303) are provided on both the first baffle layer (301) and the second baffle layer (302); and the second baffle layer (302) is arranged to be lifted.

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