Intelligent control system and method based on five-section Bardenpho process

Abstract

The invention relates to the technical field of sewage treatment, in particular to an intelligent control system and method based on a five-section Bardellpho process, and the intelligent control system comprises a water inlet module, an aeration module, a backflow module, a sludge discharge module and a control module; the control module is respectively in communication connection with the water inlet module, the aeration module, the backflow module and the sludge discharge module; a first aerobic tank is divided into a low-oxygen area and a high-oxygen area, and ammonia nitrogen analyzers are mounted at the tail end of the high-oxygen area of the first aerobic tank and the tail end of a second aerobic tank respectively and used for collecting ammonia nitrogen concentrations of corresponding areas; dO monitors are respectively arranged at the tail ends of the low-oxygen zone of the first aerobic tank, the high-oxygen zone of the first aerobic tank and the second aerobic tank and are used for collecting the DO concentration of the corresponding zones. Based on the intelligent control system, the intelligent control method provided by the invention accurately controls the operation parameters to be in an optimized state. According to the invention, the effect of strengthening endogenous denitrification and efficient nitrogen removal is realized, refined operation is realized, and the operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to an intelligent control system and method based on a five-stage Bardenpho process. Background Art

[0002] As sewage treatment discharge standards become increasingly stringent, the requirements for the total nitrogen content in the effluent from sewage treatment plants are also getting higher and higher. Traditional biological sewage treatment processes are mostly pre-denitrification industries, such as the AAO process. The denitrification efficiency is limited by the reflow ratio, making it difficult to achieve efficient denitrification.

[0003] At present, the five-stage Bardenpho process not only has pre-anoxic but also post-anoxic. It can overcome the shortcomings of traditional pre-denitrification process that is difficult to achieve deep denitrification, and its application is becoming more and more extensive. However, my country's sewage generally has the characteristics of low C / N ratio, and sewage treatment plants often need to add a large amount of carbon source for biological denitrification, resulting in high treatment costs. Endogenous denitrification can make full use of the carbon source in the raw water for denitrification, and has the advantages of saving reagents, low sludge production, and stable treatment effect. The post-anoxic of the five-stage Bardenpho process can utilize endogenous denitrification, but in actual operation, most water plants operate in an extensive manner, lack an understanding of the control of endogenous denitrification, and it is difficult to give full play to the advantages of endogenous denitrification. They still rely on the addition of external carbon sources for denitrification and denitrification.

[0004] Therefore, there is an urgent need for an intelligent control system and method based on the five-stage Bardenpho process. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an intelligent control system and method based on the five-stage Bardenpho process, which can achieve the effect of enhancing endogenous denitrification and efficient nitrogen removal, and solves the technical problem that a large amount of external carbon source still needs to be added for denitrification and nitrogen removal in the prior art, making it difficult to achieve efficient nitrogen removal.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, an embodiment of the present invention provides an intelligent control system based on a five-stage Bardenpho process, wherein the sewage treatment system applied by the intelligent control system includes a biological pool and a sedimentation tank, wherein the biological pool includes an anaerobic pool, a first anoxic pool, a first aerobic pool, a second anoxic pool, and a second aerobic pool from front to back, wherein the first aerobic pool includes a low oxygen zone and a high oxygen zone; the intelligent control system includes:

[0010] Water inlet module, aeration module, return module, sludge discharge module and control module;

[0011] The control module is respectively connected to the water inlet module, the aeration module, the reflux module and the mud discharge module for communication;

[0012] The aeration module includes: two ammonia nitrogen analyzers and three DO monitors;

[0013] Two ammonia nitrogen analyzers and three DO monitors are respectively connected to the control module for communication;

[0014] Two ammonia nitrogen analyzers are installed at the end of the high oxygen zone of the first aerobic pool and the end of the second aerobic pool, respectively, to detect and collect the ammonia nitrogen concentration in the corresponding areas; three DO monitors are installed in the low oxygen zone of the first aerobic pool, the high oxygen zone of the first aerobic pool and the end of the second aerobic pool, respectively, to collect the DO concentration in the corresponding areas.

[0015] Optionally, the anaerobic tank, the first anoxic tank, the first aerobic tank, the second anoxic tank and the second aerobic tank are sequentially connected;

[0016] The hypoxic zone of the first aerobic pool is connected to the hyperoxic zone, the hypoxic zone of the first aerobic pool is connected to the first anoxic pool, and the hyperoxic zone of the first aerobic pool is connected to the second anoxic zone.

[0017] Optionally, the aeration module further comprises:

[0018] Gas flow meter, fan, aeration pipeline and aeration regulating valve;

[0019] The fan is connected to the beginning of the aeration pipeline; the tail end of the aeration pipeline is divided into at least three branches, which are respectively connected to the low oxygen zone of the first aerobic tank, the high oxygen zone of the first aerobic tank and the second aerobic tank; the aeration regulating valves are respectively arranged on the low oxygen zone of the first aerobic tank, the high oxygen zone of the first aerobic tank and the aeration branches of the second aerobic tank;

[0020] The gas flow meter is arranged on the aeration pipeline;

[0021] The gas flow meter, the fan and the aeration regulating valve are communicatively connected with the control module.

[0022] Optionally, the water inlet module comprises:

[0023] Inlet flow meter, inlet pump, electric regulating valve and inlet pipeline;

[0024] The water inlet pipeline is connected to the anaerobic tank;

[0025] The water inlet flow meter, the water inlet pump and the electric regulating valve are installed on the water inlet pipeline and are communicatively connected with the control module.

[0026] Optionally, the reflux module comprises:

[0027] An internal reflux unit and an external reflux unit;

[0028] The internal reflux unit comprises: an internal reflux flowmeter, an internal reflux pump and an internal reflux pipeline;

[0029] The external reflux unit comprises: an external reflux flowmeter, an external reflux pump and an external reflux pipeline;

[0030] The internal reflux flowmeter and the internal reflux pump are installed on the internal reflux pipeline, and the external reflux flowmeter and the external reflux pump are installed on the external reflux pipeline.

[0031] In a second aspect, an embodiment of the present invention provides an intelligent control method based on a five-stage Bardenpho process, comprising:

[0032] S10, obtaining the real-time value of each operating parameter, inputting the real-time value of each operating parameter and the corresponding set value of each operating parameter into the algorithm set in advance, and obtaining the overall scheduling plan;

[0033] The overall scheduling plan includes: the number and frequency of fans turned on, the frequency of the external return pump, the frequency of the internal return pump, and the frequency of the water inlet pump or the opening of the electric regulating valve;

[0034] S20, according to the overall scheduling plan, adjusting the parameters of the water inlet module, the aeration module, the reflux module, and the sludge discharge module in the intelligent control module based on the five-stage Bardenpho process;

[0035] The operating parameters include: water inlet flow, dissolved oxygen concentration in the low oxygen zone of the first aerobic tank, dissolved oxygen concentration in the high oxygen zone of the first aerobic tank, dissolved oxygen concentration in the second aerobic tank, ammonia nitrogen concentration in the first aerobic tank, ammonia nitrogen concentration in the second aerobic tank, internal reflux flow, and MLSS concentration.

[0036] Optionally, the set value of the water inlet flow rate is determined according to the hydraulic retention time; the hydraulic retention time of the anaerobic tank is 2-3h;

[0037] The set value of dissolved oxygen concentration in the hypoxic zone of the first aerobic pool is 0.1-0.3 mg / L;

[0038] The set value of dissolved oxygen concentration in the high oxygen zone of the first aerobic pool is 1-2 mg / L;

[0039] The set value of dissolved oxygen concentration in the second aerobic pool is 1.5-2.5 mg / L;

[0040] The set value of ammonia nitrogen concentration in the first aerobic tank and the set value of ammonia nitrogen concentration in the second aerobic tank are set according to the discharge standard of ammonia nitrogen concentration in effluent;

[0041] The internal reflux flow setting value is determined according to the internal reflux ratio, and the internal reflux ratio is not greater than 300%.

[0042] Optionally, the S10 specifically includes:

[0043] S11, obtaining the required air volume of the hypoxic zone of the first aerobic pool according to the real-time dissolved oxygen concentration value of the hypoxic zone of the first aerobic pool and the set value of the dissolved oxygen concentration of the hypoxic zone of the first aerobic pool;

[0044] S12, judging whether the real-time value of dissolved oxygen concentration in the high oxygen zone of the first aerobic pool is less than or equal to the set value of dissolved oxygen concentration in the high oxygen zone of the first aerobic pool; if it is less than or equal to, obtaining the required air volume in the high oxygen zone of the first aerobic pool according to the real-time value of ammonia nitrogen concentration in the first aerobic pool and the set value of ammonia nitrogen concentration in the first aerobic pool; if it is greater than, obtaining the required air volume in the high oxygen zone of the first aerobic pool according to the real-time value of dissolved oxygen concentration in the high oxygen zone of the first aerobic pool and the set value of dissolved oxygen concentration in the high oxygen zone of the first aerobic pool;

[0045] S13, judging whether the real-time value of the ammonia nitrogen concentration in the second aerobic pool is less than or equal to the set value of the ammonia nitrogen concentration in the second aerobic pool;

[0046] If it is less than or equal to, the required air volume of the second aerobic pool is obtained according to the real-time value and the set value of the dissolved oxygen concentration in the second aerobic pool; if it is greater than, the required air volume of the second aerobic pool is obtained according to the real-time value and the set value of the ammonia nitrogen concentration in the second aerobic pool;

[0047] S14, according to the air volume requirement of the first aerobic pool low oxygen zone, the air volume requirement of the first aerobic pool high oxygen zone and the air volume requirement of the second aerobic pool, the number and frequency of fans turned on are obtained, and the opening of the aeration regulating valves of the first aerobic pool low oxygen zone, the first aerobic pool high oxygen zone and the aeration branch of the second aerobic pool is adjusted.

[0048] Optionally, the S10 further includes:

[0049] S15, when MLSS_ 设定 -ΔMLSS≤MLSS_ 实时 ≤MLSS_ 设定 +ΔMLSS, the external reflux flow rate is not adjusted; when MLSS_ 实时 ≤MLSS_ 设定 -ΔMLSS, increase the external reflux flow rate and the frequency of the external reflux pump; when MLSS_ 实时 ≥MLSS_ 设定 When +ΔMLSS, reduce the external reflux flow rate and the frequency of the external reflux pump;

[0050] Among them, MLSS_ 设定 Set the value for MLSS concentration, MLSS_ 实时 is the real-time value of MLSS concentration, ΔMLSS is the change value of MLSS concentration;

[0051] Moreover, when the real-time value of the internal reflux flow is greater than the set value of the internal reflux flow, the frequency of the internal reflux pump is reduced; when the real-time value of the internal reflux flow is less than the set value of the internal reflux flow, the frequency of the internal reflux pump is increased.

[0052] Optionally, the S10 further includes:

[0053] S16. When the real-time value of the water inlet flow is greater than the set value of the water inlet flow, reduce the frequency of the water inlet pump or reduce the opening of the electric regulating valve on the water inlet pipe; when the real-time value of the water inlet flow is less than the set value of the water inlet flow, increase the frequency of the water inlet pump or increase the opening of the electric regulating valve on the water inlet pipe.

[0054] (III) Beneficial effects

[0055] The beneficial effects of the present invention are as follows: an intelligent control system and method based on the five-stage Bardenpho process of the present invention can realize denitrification and phosphorus removal in the first anoxic zone by optimizing operating parameters such as hydraulic retention time and internal and external reflux ratio, and achieve dual-use of carbon, while removing nitrogen and phosphorus, reducing carbon sources, and adding phosphorus removal agents.

[0056] At the same time, the present invention divides the first aerobic tank into a low oxygen zone and a high oxygen zone. Controlling the reduced DO concentration in the low oxygen zone is helpful to achieve synchronous nitrification and endogenous denitrification. The DO concentration in the high oxygen zone is controlled in a relatively high range, which can avoid the inhibition of the activity of nitrifying bacteria by too low DO concentration throughout the whole process. In the high oxygen zone, ammonia nitrogen concentration and dissolved oxygen concentration are used to coordinately control aeration. On the one hand, while achieving the ammonia nitrogen concentration reaching the standard, excessive aeration is prevented, saving aeration energy consumption. On the other hand, the dissolved oxygen carried by the reflux liquid entering the first anoxic tank and the mixed liquid entering the second anoxic tank is reduced, solving the technical problem of consuming carbon source and affecting the denitrification effect.

[0057] The present invention is helpful to enrich endogenous denitrifying bacteria, can strengthen the endogenous denitrification effect of the second anoxic zone, further improve the TN removal rate, and reduce the addition of carbon source.

[0058] Furthermore, the present invention reasonably controls the dissolved oxygen concentration in the second aerobic tank to avoid excessive dissolved oxygen concentration, excessive aeration, and also avoids excessive dissolved oxygen concentration, which causes floating of sludge in the sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a structural diagram of an intelligent control system based on a five-stage Bardenpho process in Example 1 of the present invention;

[0060] Figure 2 Schematic diagram of a flow chart of an intelligent control method based on a five-stage Bardenpho process in Example 2 of the present invention.

[0061] [Description of Reference Numerals]

[0062] 1: anaerobic tank; 2: first anoxic tank; 3: first aerobic tank low oxygen zone; 4: first aerobic tank high oxygen zone; 5: second anoxic tank; 6: second aerobic tank; 7: sedimentation tank; 8: water inlet pump; 9: electric regulating valve; 10: water inlet flow meter; 11: internal reflux pump; 12: internal reflux flow meter; 13: external reflux pump; 14: external reflux flow meter; 15: mud pump; 16: fan; 17: gas flow meter; 18: DO monitor; 19: ammonia nitrogen analyzer; 20: MLSS analyzer; 21: mud level meter; 22: agitator. DETAILED DESCRIPTION

[0063] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0064] An intelligent control system and method based on a five-stage Bardenpho process proposed in an embodiment of the present invention divides the first aerobic tank into a low oxygen zone and a high oxygen zone. Controlling the reduced dissolved oxygen concentration in the low oxygen zone helps to achieve synchronous nitrification and endogenous denitrification. In the high oxygen zone, the dissolved oxygen concentration is controlled in a relatively high range, which can avoid the inhibition of the activity of nitrifying bacteria by too low dissolved oxygen concentration throughout the process. In the high oxygen zone, ammonia nitrogen and dissolved oxygen are used to coordinately control aeration. On the one hand, while achieving the ammonia nitrogen concentration standard, excessive aeration is prevented, saving aeration energy consumption. On the other hand, the dissolved oxygen carried by the internal reflux liquid entering the first anoxic tank and the mixed liquid entering the second anoxic tank can be reduced, consuming carbon sources and affecting the denitrification effect. Furthermore, the present invention can achieve denitrification and phosphorus removal in the first anoxic zone by optimizing operating parameters such as hydraulic retention time and internal and external reflux ratio, and achieve dual-use of carbon, while removing nitrogen and phosphorus, and reducing the addition of carbon sources and phosphorus removal agents. In addition, this aspect reasonably controls the dissolved oxygen concentration in the second aerobic zone to avoid excessive dissolved oxygen concentration and excessive aeration, and also to avoid excessive dissolved oxygen concentration, which causes the sludge in the sedimentation tank to float.

[0065] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0066] Example 1

[0067] See also Figure 1, an intelligent control system based on a five-stage Bardenpho process according to an embodiment of the present invention, wherein the sewage treatment system applied by the intelligent control system comprises a biological pool and a sedimentation tank 7, wherein the biological pool comprises an anaerobic pool 1, a first anoxic pool 2, a first aerobic pool, a second anoxic pool 5 and a second aerobic pool 6 in order from front to back, wherein the first aerobic pool comprises a hypoxic zone 3 and a hyperoxic zone 4; the intelligent control system comprises:

[0068] Water inlet module, aeration module, return module, sludge discharge module and control module;

[0069] The control module is respectively connected to the water inlet module, the aeration module, the reflux module and the mud discharge module in communication;

[0070] The aeration module includes: two ammonia nitrogen analyzers 19, three DO monitors 18;

[0071] Two ammonia nitrogen analyzers 19 and three DO monitors 18 are respectively connected to the control module for communication;

[0072] Two ammonia nitrogen analyzers 19 are respectively installed at the end of the high oxygen zone 4 of the first aerobic pool and the end of the second aerobic pool 6, for detecting and collecting the ammonia nitrogen concentration in the corresponding areas; three DO monitors 18 are respectively installed at the end of the low oxygen zone 3 of the first aerobic pool, the high oxygen zone 4 of the first aerobic pool and the end of the second aerobic pool 6, for collecting the DO concentration in the corresponding areas.

[0073] The anaerobic tank 1, the first anoxic tank 2, the first aerobic tank, the second anoxic tank 5 and the second aerobic tank 6 are connected in sequence;

[0074] The hypoxic zone 3 of the first aerobic pool is connected to the hyperoxic zone 4 , the hypoxic zone 3 of the first aerobic pool is connected to the first anoxic pool 2 , and the hyperoxic zone 4 of the first aerobic pool is connected to the second anoxic pool 5 .

[0075] A stirrer 22 is present in the anaerobic tank 1 , the first anoxic tank 2 , and the second anoxic zone 5 .

[0076] In this embodiment, the aeration module further includes:

[0077] Gas flow meter 17, fan 16, aeration pipeline and aeration regulating valve;

[0078] The fan 16 is connected to the beginning of the aeration pipeline; the tail end of the aeration pipeline is divided into at least three branches, which are respectively connected to the first aerobic tank low oxygen zone 3, the first aerobic tank high oxygen zone 4 and the second aerobic tank 6, and the aeration regulating valves are respectively arranged on the aeration branches of the first aerobic tank low oxygen zone 3, the first aerobic tank high oxygen zone 4 and the second aerobic tank 6;

[0079] The gas flow meter 17 is arranged on the aeration pipeline;

[0080] The gas flow meter 17, the fan 16 and the aeration regulating valve are communicatively connected with the control module.

[0081] In the specific implementation process, the fan 16 is a variable frequency fan, and electric regulating valves 9 are respectively provided on the three branches to adjust the air volume of each branch.

[0082] In this embodiment, the water inlet module includes:

[0083] Inlet flow meter 10, inlet pump 8, electric regulating valve 9 and inlet pipeline;

[0084] The water inlet pipeline is connected to anaerobic tank 1;

[0085] The water inlet flow meter 10, the water inlet pump 8 and the electric regulating valve 9 are installed on the water inlet pipeline and are communicatively connected with the control module.

[0086] In this embodiment, the reflux module includes:

[0087] An internal reflux unit and an external reflux unit;

[0088] The internal reflux unit includes: an internal reflux flow meter 12, an internal reflux pump 11 and an internal reflux pipeline;

[0089] The external reflux unit includes: an external reflux flow meter 14, an external reflux pump 13 and an external reflux pipeline;

[0090] The internal reflux flowmeter 12 and the internal reflux pump 11 are installed on the internal reflux pipeline, and the external reflux flowmeter 14 and the external reflux pump 13 are installed on the external reflux pipeline.

[0091] In this embodiment, both the internal reflux pump 11 and the external reflux pump 13 are variable frequency pumps.

[0092] The control module of this embodiment adopts a PLC control system.

[0093] In a specific embodiment, the mud discharge module includes: a mud level meter 21, a mud discharge pump 15 and a mud discharge pipeline;

[0094] The mud level meter 21 is installed in the sedimentation tank 7, and the mud discharge pump 15 is installed on the mud discharge pipeline.

[0095] The intelligent control system in this embodiment further includes: an MLSS analyzer 20 .

[0096] The intelligent control system of this embodiment accurately controls key links such as water inlet, aeration, backflow and sludge discharge, automatically adjusts to maintain the best operating conditions, reduces manual operations, realizes refined operation, and effectively improves the sewage treatment efficiency. At the same time, through real-time monitoring of ammonia nitrogen concentration and dissolved oxygen concentration, the aeration volume can be dynamically adjusted to ensure that the activity of microorganisms in each reaction tank is in the best state, thereby improving the removal rate of pollutants, improving the technical level of sewage treatment, and providing strong support for achieving sustainable development.

[0097] Example 2

[0098] See also Figure 2 , an intelligent control method based on a five-stage Bardenpho process according to an embodiment of the present invention comprises:

[0099] Step S10: obtaining the real-time value of each operating parameter, inputting the real-time value of each operating parameter and the corresponding set value of each operating parameter into the algorithm set in advance, and obtaining the overall scheduling plan;

[0100] The overall scheduling plan includes: the number and frequency of fans 16 turned on, the frequency of the external return pump 13, the frequency of the internal return pump 11, and the frequency of the water inlet pump 8 or the opening of the electric regulating valve 9;

[0101] Step S20, according to the overall scheduling plan, adjusting the parameters of the water inlet module, the aeration module, the reflux module, and the sludge discharge module in any one of the intelligent control systems based on the five-stage Bardenpho process described in Example 1;

[0102] The operating parameters include: water inlet flow, dissolved oxygen concentration in the low oxygen zone 3 of the first aerobic tank, dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic tank, dissolved oxygen concentration in the second aerobic tank 6, ammonia nitrogen concentration in the first aerobic tank, ammonia nitrogen concentration in the second aerobic tank 6, internal reflux flow and MLSS concentration.

[0103] The set value of the water flow rate is determined according to the hydraulic retention time; the hydraulic retention time of the anaerobic tank 1 is 2-3h;

[0104] The set value of dissolved oxygen concentration in the hypoxic zone 3 of the first aerobic pool is 0.1-0.3 mg / L;

[0105] The set value of dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic pool is 1-2 mg / L;

[0106] The set value of dissolved oxygen concentration in the second aerobic pool 6 is 1.5-2.5 mg / L;

[0107] The ammonia nitrogen concentration setting value in the first aerobic tank and the ammonia nitrogen concentration setting value in the second aerobic tank 6 are set according to the effluent ammonia nitrogen concentration discharge standard;

[0108] The internal reflux flow setting value is determined according to the internal reflux ratio, and the internal reflux ratio is not greater than 300%.

[0109] In the specific implementation process, the MLSS concentration is the suspended solids concentration of the mixed liquor. The MLSS concentration is set according to the water quality and design conditions, and the MLSS concentration change value is determined based on the MLSS concentration.

[0110] For example, when the MLSS concentration setting value is 3000-5000 mg / L, the MLSS concentration change value is set to 500 mg / L.

[0111] In the specific implementation process, the MLSS concentration is set according to the water quality and design conditions, and the MLSS concentration change value is determined based on the MLSS concentration.

[0112] In this embodiment, step S10 specifically includes:

[0113] Step S11, obtaining the required air volume of the hypoxic zone 3 of the first aerobic pool according to the real-time value of the dissolved oxygen concentration in the hypoxic zone 3 of the first aerobic pool and the set value of the dissolved oxygen concentration in the hypoxic zone 3 of the first aerobic pool;

[0114] Step S12, judging whether the real-time value of the dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic pool is less than or equal to the set value of the dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic pool, if it is less than or equal to, obtaining the required air volume of the high oxygen zone 4 of the first aerobic pool according to the real-time value of the ammonia nitrogen concentration in the first aerobic pool and the set value of the ammonia nitrogen concentration in the first aerobic pool; if it is greater than, obtaining the required air volume of the high oxygen zone 4 of the first aerobic pool according to the real-time value of the dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic pool and the set value of the dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic pool;

[0115] Step S13, judging whether the real-time value of the ammonia nitrogen concentration in the second aerobic pool 6 is less than or equal to the set value of the ammonia nitrogen concentration in the second aerobic pool 6;

[0116] If it is less than or equal to, the required air volume of the second aerobic pool 6 is obtained according to the real-time value and the set value of the dissolved oxygen concentration in the second aerobic pool 6; if it is greater than, the required air volume of the second aerobic pool 6 is obtained according to the real-time value and the set value of the ammonia nitrogen concentration in the second aerobic pool 6;

[0117] Step S14, according to the air volume requirement of the first aerobic pool hypoxic zone 3, the air volume requirement of the first aerobic pool high oxygen zone 4 and the air volume requirement of the second aerobic pool 6, the number and frequency of the fans 16 turned on are obtained, and the opening of the aeration regulating valves of the aeration branches of the first aerobic pool hypoxic zone 3, the first aerobic pool high oxygen zone 4 and the second aerobic pool 6 are adjusted.

[0118] In the specific implementation process, according to the real-time value of dissolved oxygen concentration in the hypoxic zone 3 of the first aerobic pool and the set value of dissolved oxygen concentration in the hypoxic zone 3 of the first aerobic pool, the required air volume of the hypoxic zone 3 of the first aerobic pool is obtained, which includes:

[0119] Calculate the difference between the real-time value of dissolved oxygen concentration in hypoxic zone 3 of the first aerobic pool and the set value of dissolved oxygen concentration in hypoxic zone 3 of the first aerobic pool at the current time:

[0120] ΔDO 1 (t) = DO -设定1 -DO -1t ;

[0121] Among them, DO -设定1 The set value of dissolved oxygen concentration in hypoxic zone 3 of the first aerobic pool, DO -1t The real-time value of dissolved oxygen concentration in hypoxic zone 3 of the first aerobic pool;

[0122] The required air volume Q in the hypoxic zone 3 of the first aerobic pool can be calculated based on the PID formula 风1 :

[0123]

[0124] Among them, Q 风1 is the required air volume of the hypoxic zone 3 of the first aerobic pool, K p is the proportional coefficient set according to the empirical value, ΔDO 1 (t) is the difference between the real-time value of dissolved oxygen concentration in the hypoxic zone 3 of the first aerobic pool and the set value of dissolved oxygen concentration in the hypoxic zone 3 of the first aerobic pool, T i is the integration time constant, T d is the differential time constant.

[0125] Similarly, obtaining the required air volume of the high oxygen zone 4 of the first aerobic pool specifically includes:

[0126] When the real-time value of dissolved oxygen concentration in high oxygen zone 4 of the first aerobic pool is less than or equal to the set value of dissolved oxygen concentration in high oxygen zone 4 of the first aerobic pool,

[0127]

[0128] Among them, Q 风2 is the air volume required in the high oxygen zone 4 of the first aerobic pool, K p is the proportionality coefficient set according to the empirical value, ΔNH 3 OneN 1 (t) is the difference between the real-time value of the ammonia nitrogen concentration in the high oxygen zone 4 of the first aerobic pool and the set value of the ammonia nitrogen concentration in the high oxygen zone 4 of the first aerobic pool, T i is the integration time constant, T d is the differential time constant.

[0129] When the real-time value of dissolved oxygen concentration in high oxygen zone 4 of the first aerobic pool is greater than the set value of dissolved oxygen concentration in high oxygen zone 4 of the first aerobic pool,

[0130]

[0131] ΔDO2 (t) is the difference between the real-time value of dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic pool and the set value of dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic pool.

[0132] Similarly, the air volume Q required for the second aerobic pool 6 is obtained. 风3 :

[0133] Therefore, the total required air volume is:

[0134] Q 风 =Q 风1 +Q 风2 +Q 风3

[0135] According to the total required air volume and the maximum air volume of each fan, the required number of fans is obtained, and the number and frequency of fans to be turned on are determined.

[0136] Step S10 also includes:

[0137] Step S15, when MLSS_ 设定 -ΔMLSS≤MLSS_ 实时 ≤MLSS_ 设定 +ΔMLSS, the external reflux flow rate is not adjusted; when MLSS_ 实时 ≤MLSS_ 设定 -ΔMLSS, increase the external reflux flow rate and the frequency of the external reflux pump 13; when MLSS_ 实时 ≥MLSS_ 设定 When +ΔMLSS, the external reflux flow rate is reduced, and the frequency of the external reflux pump 13 is reduced;

[0138] Among them, MLSS_ 设定 Set the value for MLSS concentration, MLSS_ 实时 is the real-time value of MLSS concentration, ΔMLSS is the change value of MLSS concentration;

[0139] Moreover, when the real-time value of the internal reflux flow is greater than the set value of the internal reflux flow, the frequency of the internal reflux pump 11 is reduced; when the real-time value of the internal reflux flow is less than the set value of the internal reflux flow, the frequency of the internal reflux pump 11 is increased.

[0140] In the specific implementation process, step S10 also includes:

[0141] Step S16, when the real-time value of the water inlet flow is greater than the set value of the water inlet flow, reduce the frequency of the water inlet pump 8 or reduce the opening of the electric regulating valve 9 on the water inlet pipe; when the real-time value of the water inlet flow is less than the set value of the water inlet flow, increase the frequency of the water inlet pump 8 or increase the opening of the electric regulating valve 9 on the water inlet pipe.

[0142] The intelligent control method based on the five-stage Bardenpho process in this embodiment also includes:

[0143] The real-time mud level of the sedimentation tank 7 and the set start / stop mud level of the mud discharge pump 15 are obtained, and the real-time mud level of the sedimentation tank 7 and the set start / stop mud level of the mud discharge pump 15 are compared to control the start / stop of the mud discharge pump 15 .

[0144] The present embodiment provides an intelligent control method based on the five-stage Bardenpho process, which helps to enrich endogenous denitrifying bacteria by optimizing operating parameters such as hydraulic retention time and internal and external reflow ratio, and can achieve denitrification and phosphorus removal in the first anoxic tank 2, achieving dual-use of carbon, and simultaneously removing nitrogen and phosphorus, thereby reducing the addition of carbon sources and phosphorus removal agents.

[0145] Furthermore, in this embodiment, the first aerobic tank is divided into a low oxygen zone 3 and a high oxygen zone 4. The front 1 / 3 of the first aerobic tank is the low oxygen zone 3, and the rear 2 / 3 is the high oxygen zone 4. Controlling the reduced dissolved oxygen concentration in the low oxygen zone 3 is helpful to achieve synchronous nitrification and endogenous denitrification. The dissolved oxygen concentration in the high oxygen zone 4 is controlled in a relatively high range to avoid the inhibition of the activity of nitrifying bacteria by too low dissolved oxygen concentration throughout the process. In the high oxygen zone 4, ammonia nitrogen and dissolved oxygen are used to coordinately control aeration. On the one hand, while achieving the standard ammonia nitrogen concentration, excessive aeration is prevented, saving aeration energy consumption. On the other hand, the dissolved oxygen carried by the internal reflux liquid entering the first anoxic tank 2 and the mixed liquid entering the second anoxic tank 5 can be reduced, carbon source is consumed, and the denitrification effect is affected.

[0146] Example 3

[0147] An intelligent control method based on a five-stage Bardenpho process according to an embodiment of the present invention includes:

[0148] Step S10: obtaining the real-time value of each operating parameter, inputting the real-time value of each operating parameter and the corresponding set value of each operating parameter into the algorithm set in advance, and obtaining the overall scheduling plan;

[0149] The overall scheduling plan includes: the number and frequency of fans 16 turned on, the frequency of the external return pump 13, the frequency of the internal return pump 11, and the frequency of the water inlet pump 8 or the opening of the electric regulating valve 9;

[0150] Step S20, according to the overall scheduling plan, adjusting the parameters of the water inlet module, the aeration module, the reflux module, and the sludge discharge module in any one of the intelligent control systems based on the five-stage Bardenpho process described in Example 1;

[0151] The operating parameters include: water inlet flow, dissolved oxygen concentration in the low oxygen zone 3 of the first aerobic tank, dissolved oxygen concentration in the high oxygen zone 4 of the first aerobic tank, dissolved oxygen concentration in the second aerobic tank 6, ammonia nitrogen concentration in the first aerobic tank, ammonia nitrogen concentration in the second aerobic tank 6, internal reflux flow, MLSS concentration and MLSS concentration change value.

[0152] For example, in this embodiment, the dissolved oxygen concentration setting value of the low oxygen zone 3 of the first aerobic pool is controlled at 0.1-0.3 mg / L; the dissolved oxygen concentration setting value of the high oxygen zone 4 of the first aerobic pool is controlled at 1-2 mg / L; the dissolved oxygen concentration setting value in the second aerobic pool 6 is controlled at 1.5-2.5 mg / L; the ammonia nitrogen concentration setting value at the end of the first aerobic pool is set to 1 mg / L in combination with the local effluent ammonia nitrogen concentration discharge standard; the internal reflux ratio is controlled at 200%, and the MLSS concentration is controlled at 4500±500 mg / L, the hydraulic retention time of the anaerobic tank 1 is 2.5h, the hydraulic retention time of the first anoxic tank 2 is 3.5h, the hydraulic retention time of the low oxygen zone 3 of the first aerobic tank is 2.5h, the hydraulic retention time of the high oxygen zone 4 of the first aerobic tank is 5h, the hydraulic retention time of the second anoxic tank 5 is 3h, the hydraulic retention time of the second aerobic tank 6 is 0.5h, and the total hydraulic retention time is 17h. The water quality of the inlet and outlet water of the sewage treatment system in Example 1 is shown in Table 1 when the carbon source is not added in a stable operation.

[0153] Table 1 Inlet and outlet water quality of the sewage treatment system without adding carbon source

[0154] project COD TN <![CDATA[NH 3 -N]]> <![CDATA[PO 4 -P]]> Influent water quality (mg / L) 262 56 49 3.2 Outlet water quality (mg / L) 24 9.8 0.53 0.3 Removal rate (%) 90％ 82.5％ 80.1％ 98.9％

[0155] It can be seen from the table that the sewage treatment system has achieved good nitrogen and phosphorus removal effects.

[0156] In addition, the sewage treatment system realizes denitrification and phosphorus removal in the first anoxic tank 2, and the denitrification phosphorus removal in the first anoxic tank 2 accounts for more than 70% of the anaerobic effluent phosphorus content. After the first anoxic tank 2, the COD concentration (chemical oxygen demand concentration) of the sewage treatment system has no obvious change, indicating that the exogenous COD is basically degraded completely, but the TN (total nitrogen) in the first aerobic zone and the second anoxic zone is significantly reduced, indicating that the sewage treatment system has achieved synchronous nitrification and endogenous denitrification in the first aerobic tank, and the second anoxic tank 5 has also strengthened endogenous denitrification. The total nitrogen removal in the first aerobic tank and the second anoxic tank 5 accounts for more than 20% of the total nitrogen in the influent.

[0157] It can be seen that the intelligent control system based on the five-stage Bardenpho process provided in Example 1 executes the intelligent control method based on the five-stage Bardenpho process in Example 2, strengthens endogenous denitrification, and achieves good nitrogen removal and phosphorus removal effects without adding a carbon source.

[0158] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0159] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0160] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0161] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0162] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An intelligent control system based on a five-stage Bardenpho process, characterized in that: The sewage treatment system applied by the intelligent control system comprises a biological pool and a sedimentation tank (7), wherein the biological pool comprises, from front to back, an anaerobic pool (1), a first anoxic pool (2), a first aerobic pool, a second anoxic pool (5) and a second aerobic pool (6), wherein the first aerobic pool comprises a low oxygen zone (3) and a high oxygen zone (4); the intelligent control system comprises: Water inlet module, aeration module, return module, sludge discharge module and control module; The control module is respectively connected to the water inlet module, the aeration module, the reflux module and the mud discharge module for communication; The aeration module comprises: two ammonia nitrogen analyzers (19) and three DO monitors (18); Two ammonia nitrogen analyzers (19) and three DO monitors (18) are respectively connected to the control module for communication; Two ammonia nitrogen analyzers (19) are respectively installed at the end of the high oxygen zone (4) of the first aerobic pool and the end of the second aerobic pool (6) to detect and collect ammonia nitrogen concentrations in corresponding areas; three DO monitors (18) are respectively installed at the end of the low oxygen zone (3) of the first aerobic pool, the high oxygen zone (4) of the first aerobic pool and the end of the second aerobic pool (6) to collect DO concentrations in corresponding areas.

2. The intelligent control system based on the five-stage Bardenpho process according to claim 1 is characterized in that: The anaerobic tank (1), the first anoxic tank (2), the first aerobic tank, the second anoxic tank (5) and the second aerobic tank (6) are sequentially connected; The hypoxic zone (3) of the first aerobic pool is connected to the hyperoxic zone (4), the hypoxic zone (3) of the first aerobic pool is connected to the first anoxic pool (2), and the hyperoxic zone (4) of the first aerobic pool is connected to the second anoxic pool (5).

3. The intelligent control system based on the five-stage Bardenpho process according to claim 1 is characterized in that: The aeration module also includes: A gas flow meter (17), a fan (16), an aeration pipeline and an aeration regulating valve; The fan (16) is connected to the start end of the aeration pipeline; the tail end of the aeration pipeline is divided into at least three branches which respectively lead to the first aerobic tank low oxygen zone (3), the first aerobic tank high oxygen zone (4) and the second aerobic tank (6); the aeration regulating valves are respectively arranged on the aeration branches of the first aerobic tank low oxygen zone (3), the first aerobic tank high oxygen zone (4) and the second aerobic tank (6); The gas flow meter (17) is arranged on the aeration pipeline; The gas flow meter (17), the fan (16) and the aeration regulating valve are communicatively connected to the control module.

4. The intelligent control system based on the five-stage Bardenpho process according to claim 1 is characterized in that: The water inlet module comprises: A water inlet flow meter (10), a water inlet pump (8), an electric regulating valve (9) and a water inlet pipeline; The water inlet pipeline is connected to the anaerobic tank (1); The water inlet flow meter (10), the water inlet pump (8) and the electric regulating valve (9) are installed on the water inlet pipeline and are communicatively connected with the control module.

5. The intelligent control system based on the five-stage Bardenpho process according to claim 1 is characterized in that: The reflux module comprises: An internal reflux unit and an external reflux unit; The internal reflux unit comprises: an internal reflux flow meter (12), an internal reflux pump (11) and an internal reflux pipeline; The external reflux unit comprises: an external reflux flow meter (14), an external reflux pump (13) and an external reflux pipeline; The internal reflux flowmeter (12) and the internal reflux pump (11) are installed on the internal reflux pipeline, and the external reflux flowmeter (14) and the external reflux pump (13) are installed on the external reflux pipeline.

6. An intelligent control method based on a five-stage Bardenpho process, characterized in that: include: S10, obtaining the real-time value of each operating parameter, inputting the real-time value of each operating parameter and the corresponding set value of each operating parameter into the algorithm set in advance, and obtaining the overall scheduling plan; The overall scheduling plan includes: the number and frequency of fans (16) turned on, the frequency of the external return pump (13), the frequency of the internal return pump (11), and the frequency of the water inlet pump (8) or the opening of the electric regulating valve (9); S20. According to the overall scheduling plan, parameters of the water inlet module, the aeration module, the reflux module, and the sludge discharge module in the intelligent control system based on the five-stage Bardenpho process according to any one of claims 1 to 55 are adjusted; The operating parameters include: water inflow, dissolved oxygen concentration in the low oxygen zone (3) of the first aerobic tank, dissolved oxygen concentration in the high oxygen zone (4) of the first aerobic tank, dissolved oxygen concentration in the second aerobic tank (6), ammonia nitrogen concentration in the first aerobic tank, ammonia nitrogen concentration in the second aerobic tank (6), internal recirculation flow and MLSS concentration.

7. The intelligent control method based on the five-stage Bardenpho process according to claim 6 is characterized in that: The set value of the water inlet flow rate is determined according to the hydraulic retention time; the hydraulic retention time of the anaerobic tank (1) is 2-3h; The dissolved oxygen concentration in the hypoxic zone (3) of the first aerobic pool is set at 0.1-0.3 mg / L; The dissolved oxygen concentration in the high oxygen zone (4) of the first aerobic pool is set at 1-2 mg / L; The dissolved oxygen concentration of the second aerobic tank (6) is set at 1.5-2.5 mg / L; The ammonia nitrogen concentration setting value in the first aerobic tank and the ammonia nitrogen concentration setting value in the second aerobic tank (6) are set according to the effluent ammonia nitrogen concentration discharge standard; The internal reflux flow setting value is determined according to the internal reflux ratio, and the internal reflux ratio is not greater than 300%.

8. The intelligent control method based on the five-stage Bardenpho process according to claim 6 is characterized in that: The S10 specifically includes: S11, obtaining the required air volume of the first aerobic pool hypoxic zone (3) according to the real-time value of the dissolved oxygen concentration in the first aerobic pool hypoxic zone (3) and the set value of the dissolved oxygen concentration in the first aerobic pool hypoxic zone (3); S12, judging whether the real-time value of the dissolved oxygen concentration in the high oxygen zone (4) of the first aerobic pool is less than or equal to the set value of the dissolved oxygen concentration in the high oxygen zone (4) of the first aerobic pool; if so, obtaining the required air volume of the high oxygen zone (4) of the first aerobic pool according to the real-time value of the ammonia nitrogen concentration in the first aerobic pool and the set value of the ammonia nitrogen concentration in the first aerobic pool; if so, obtaining the required air volume of the high oxygen zone (4) of the first aerobic pool according to the real-time value of the dissolved oxygen concentration in the high oxygen zone (3) of the first aerobic pool and the set value of the dissolved oxygen concentration in the high oxygen zone (4) of the first aerobic pool; S13, determining whether the real-time value of the ammonia nitrogen concentration in the second aerobic tank (6) is less than or equal to the set value of the ammonia nitrogen concentration in the second aerobic tank (6); If it is less than or equal to, the required air volume of the second aerobic pool (6) is obtained according to the real-time value of the dissolved oxygen concentration of the second aerobic pool (6) and the set value; if it is greater than, the required air volume of the second aerobic pool (6) is obtained according to the real-time value of the ammonia nitrogen concentration of the second aerobic pool (6) and the set value of the ammonia nitrogen concentration of the second aerobic pool (6); S14, according to the air volume requirement of the first aerobic pool hypoxic zone (3), the air volume requirement of the first aerobic pool hyperoxic zone (4) and the air volume requirement of the second aerobic pool (6), the number and frequency of fans (16) turned on are obtained, and the opening of the aeration regulating valves of the aeration branches of the first aerobic pool hypoxic zone (3), the first aerobic pool hyperoxic zone (4) and the second aerobic pool (6) are adjusted.

9. The intelligent control method based on the five-stage Bardenpho process according to claim 8 is characterized in that: The S10 further includes: S15, when MLSS_ 设定 -ΔMLSS≤MLSS_ 实时 ≤MLSS_ 设定 +ΔMLSS, the external reflux flow rate is not adjusted; when MLSS_ 实时 ≤MLSS_ 设定 -ΔMLSS, increase the external reflux flow rate and the frequency of the external reflux pump (13); when MLSS_ 实时 ≥MLSS_ 设定 When +ΔMLSS, the external reflux flow rate is reduced, and the frequency of the external reflux pump (13) is reduced; Among them, MLSS_ 设定 Set the value for MLSS concentration, MLSS_ 实时 is the real-time value of MLSS concentration, ΔMLSS is the change value of MLSS concentration; Furthermore, when the real-time value of the internal reflux flow is greater than the set value of the internal reflux flow, the frequency of the internal reflux pump (11) is reduced; and when the real-time value of the internal reflux flow is less than the set value of the internal reflux flow, the frequency of the internal reflux pump (11) is increased.

10. The intelligent control method based on the five-stage Bardenpho process according to claim 9 is characterized in that: The S10 further includes: S16. When the real-time value of the water inlet flow rate is greater than the set value of the water inlet flow rate, the frequency of the water inlet pump (8) is reduced or the opening of the electric regulating valve (9) on the water inlet pipeline is reduced; when the real-time value of the water inlet flow rate is less than the set value of the water inlet flow rate, the frequency of the water inlet pump (8) is increased or the opening of the electric regulating valve (9) on the water inlet pipeline is increased.

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