Ammonia-nitrogen wastewater treatment equipment and control system thereof

Abstract

The present application relates to wastewater treatment technical field, disclose a kind of ammonia nitrogen wastewater treatment equipment and control system thereof, wastewater treatment equipment includes wastewater storage device, ammonia nitrogen enrichment device, receiving liquid storage device, ammonia nitrogen recovery device and permeate storage device, receiving liquid storage device is also equipped with heater, and its inside is equipped with temperature detector.Control system includes controller, and data acquisition module, pretreatment module, comprehensive analysis module and feedback regulation module connected with the controller respectively.By real-time detection and analysis of the current recovery process equipment state and ammonia nitrogen recovery, so as to feedback regulation according to real-time index data corresponding operation setting, make the control system more accurate to wastewater treatment equipment control.The present application has the beneficial effect of improving ammonia nitrogen recovery rate and removal rate in ammonia nitrogen wastewater, and reducing ammonia nitrogen recovery cost.

Description

[0001] The present application is a divisional application of the Chinese Invention Patent Application with the application date of June 19, 2023, the application number of 202310726394.8, and the patent name of a high ammonia-nitrogen wastewater treatment control system based on dialysis-denitrification. TECHNICAL FIELD

[0002] The present application relates to the technical field of wastewater treatment, in particular to an ammonia-nitrogen wastewater treatment equipment and a control system thereof. BACKGROUND

[0003] With the development of modern industry, water pollution problems are becoming more and more serious, leading to the increasingly serious problem of freshwater resource shortage, and has triggered a global freshwater crisis. At present, an important reason for water pollution is that the ammonia-nitrogen content in water exceeds the standard. The sources of ammonia-nitrogen in water are many, in addition to domestic sewage and landfill leachate, another important part is the discharge of industrial wastewater such as steel, oil refining, and chemical fertilizer. Ammonia-nitrogen is the main factor leading to water eutrophication, which will have a serious impact on water quality. In addition, ammonia-nitrogen in water will produce nitrite and nitrate through nitrification, and long-term drinking of such water will induce methemoglobinemia, causing serious harm to the human body.

[0004] To solve the problem of recycling and processing of ammonia-nitrogen wastewater, a ammonia-nitrogen wastewater treatment technology based on Donnan dialysis and pervaporation distillation coupling has appeared in the prior art. Donnan dialysis is used to enrich ammonium ions from ammonia-nitrogen wastewater, and ammonia gas is generated after reaction with alkali solution. Then ammonia gas is recycled through pervaporation distillation, and ammonia gas is converted into ammonium ions by reacting with acid solution and forming ammonium salt, thereby completing the recycling and processing of ammonia-nitrogen in water. Although this method can effectively remove ammonia-nitrogen in water in principle, in the specific recycling and processing process, pH adjustment control and temperature control of multiple links are involved to ensure the efficiency and recovery rate of ammonia-nitrogen recycling. At present, the adjustment and control of pH and temperature are more simple comparison with the set threshold and corresponding operation, without systematic overall analysis and control, resulting in unsatisfactory recovery rate of ammonia-nitrogen recycling and processing of the whole recycling system.

[0005] Therefore, there is an urgent need for an automatic control system for a high ammonia-nitrogen wastewater treatment equipment based on dialysis-denitrification to improve the removal rate and recovery rate of ammonia-nitrogen in ammonia-nitrogen wastewater, and to reduce the cost of ammonia-nitrogen recycling. SUMMARY

[0006] The present application aims to provide an ammonia-nitrogen wastewater treatment equipment and a control system thereof to improve the removal rate and recovery rate of ammonia-nitrogen in ammonia-nitrogen wastewater, and to reduce the cost of ammonia-nitrogen recycling.

[0007] In order to achieve the above object, the application adopts the following technical scheme: a high ammonia nitrogen wastewater treatment equipment control system based on dialysis-denitrification, comprising a controller, and a data acquisition module, a pretreatment module, a comprehensive analysis module and a feedback adjustment module connected with the controller respectively;

[0008] The data acquisition module is used for collecting the operation parameters of each link of the wastewater treatment equipment in real time.

[0009] The pretreatment module is used for data preprocessing of the collected operation parameters to obtain an effective data set.

[0010] The comprehensive analysis module is used for comprehensive analysis of the operation state of the wastewater treatment equipment and the ammonia nitrogen recovery state according to the effective data set.

[0011] The feedback adjustment module is used for generating an adjustment strategy of the operation parameters according to the analysis result of the comprehensive analysis module and intelligently adjusting and controlling the operation parameters.

[0012] The controller comprises a storage unit and a control unit, wherein the storage unit is used for storing various data in the system, and the control unit is used for controlling the normal operation of the wastewater treatment equipment.

[0013] The principle and advantages of the scheme are as follows: in actual application, the controller is used to comprehensively and systematically control the normal operation of various devices and mechanisms in the wastewater treatment equipment, so as to complete the cyclic recovery and treatment of ammonia nitrogen wastewater, and in the equipment operation process, the operation parameters of each link are collected to comprehensively analyze the operation state of the equipment and the ammonia nitrogen recovery condition, and each parameter of each link is feedback adjusted according to the existing analysis result, so that the parameters in the whole recovery process are dynamically and intelligently adjusted, the repeated liquid volume and the cycle number of ammonia nitrogen wastewater are reduced, and the removal rate and the recovery rate of ammonia nitrogen in a single cyclic recovery process are improved.

[0014] Compared with the prior art, the advantages of the scheme are that the state of the equipment and the ammonia nitrogen recovery condition in the current recovery and treatment process can be detected and analyzed in real time, so that the corresponding operation setting is feedback adjusted according to the real-time index data, thereby avoiding that the equipment is controlled according to a single condition critical point in the cyclic recovery and treatment process, so that the recovery rate of ammonia nitrogen in a single cycle is not ideal, the ammonia nitrogen content in the liquid in the next cycle is still high, the ideal recovery and removal effect is not achieved, and the cycle number of the liquid is also increased to some extent, thereby increasing the recovery cost of ammonia nitrogen. In the scheme, the real-time detection, real-time feedback and dynamic adjustment control are combined, so that the ammonia nitrogen recovery rate in a single cycle is maximized to a great extent, the working efficiency of the wastewater treatment equipment is improved, the recovery cost is effectively reduced, and the control precision of the wastewater treatment equipment is effectively improved.

[0015] Preferably, as an improvement, the wastewater treatment device comprises a wastewater storage device, a receiving liquid storage device and a permeate storage device, the ammonia-nitrogen enrichment device is connected between the wastewater storage device and the receiving liquid storage device through a circulating pipeline, and the ammonia-nitrogen recovery device is connected between the receiving liquid storage device and the permeate storage device through a circulating pipeline; a flow meter and a metering pump are arranged on the circulating pipeline between the wastewater storage device and the receiving liquid storage device and between the receiving liquid storage device and the permeate storage device; and a pH value detector is arranged in the wastewater storage device, the receiving liquid storage device and the permeate storage device.

[0016] Preferably, as an improvement, a heater is further arranged on the receiving liquid storage device, and a temperature detector is arranged in the receiving liquid storage device.

[0017] Preferably, as an improvement, the operating parameters include pH value, flow rate, flow volume, temperature and ammonia-nitrogen content.

[0018] Preferably, as an improvement, the adjustment strategies include pH value adjustment strategy, flow rate-flow volume adjustment strategy and temperature adjustment strategy.

[0019] The pH value adjustment strategy is to compare the detected pH value with a preset pH value range, and if the detected pH value does not meet the preset pH value range, the corresponding stock solution is controlled to adjust the pH value.

[0020] The flow rate adjustment strategy is to adjust the flow rate or flow volume of the liquid circulating in the circulating pipeline according to the detected ammonia-nitrogen recovery state.

[0021] The temperature adjustment strategy is to dynamically adjust the outflow parameters of the receiving liquid storage device according to the comparison result of the temperature of the liquid in the alkali solution circulating pipeline and the preset standard temperature.

[0022] Preferably, as an improvement, the dynamic adjustment of the outflow parameters of the receiving liquid storage device is that if the current temperature is within the standard temperature, the outflow flow rate of the receiving liquid storage device is controlled to be the standard flow rate; and if the current temperature is lower than the standard temperature, the outflow flow rate of the receiving liquid storage device is adjusted according to the proportion of the difference between the current temperature and the standard temperature.

[0023] Preferably, as an improvement, the adjustment of the outflow flow rate of the receiving liquid storage device according to the proportion of the difference between the current temperature and the standard temperature is that if the current temperature is lower than 60% of the standard temperature, the outflow flow rate of the receiving liquid storage device is adjusted to be 50%-70% of the standard flow rate; if the current temperature is within 60%-80% of the standard temperature, the outflow flow rate of the receiving liquid storage device is adjusted to be 70%-85% of the standard flow rate; and if the current temperature is within 80%-95% of the standard temperature, the outflow flow rate of the receiving liquid storage device is adjusted to be 90% of the standard flow rate.

[0024] Preferably, as an improvement, the standard temperature is 35-40℃; and the standard flow rate is 0.05-0.2 cm / s.

[0025] Preferably, as an improvement, the comprehensive analysis of the ammonia nitrogen recovery status is that the ammonia nitrogen content in the wastewater treatment equipment is detected and compared, so as to obtain the removal rate and recovery rate of ammonia nitrogen in the single cycle process of the wastewater treatment equipment.

[0026] Preferably, as an improvement, the removal rate is calculated by comparing the ammonia nitrogen content of the circulating water inlet and the circulating water outlet of the wastewater storage device; and the recovery rate is calculated by comparing the ammonia nitrogen content of the recovered product in the permeate storage device with the ammonia nitrogen content of the raw water in the wastewater storage device. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Figure 1 is a system schematic diagram of the first embodiment of the wastewater treatment equipment control system based on the dialysis-denitrification of high ammonia nitrogen according to the present application.

[0028] Figure 2 Figure 1 is a process flow diagram of the first embodiment of the wastewater treatment equipment control system based on the dialysis-denitrification of high ammonia nitrogen according to the present application.

[0029] Figure 3 Figure 1 is a connection relationship diagram of the raw water tank and related devices of the first embodiment of the wastewater treatment equipment control system based on the dialysis-denitrification of high ammonia nitrogen according to the present application.

[0030] Figure 4 Figure 1 is a connection relationship diagram of the alkali tank and related devices of the first embodiment of the wastewater treatment equipment control system based on the dialysis-denitrification of high ammonia nitrogen according to the present application.

[0031] Figure 5 Figure 1 is a connection relationship diagram of the acid tank and related devices of the first embodiment of the wastewater treatment equipment control system based on the dialysis-denitrification of high ammonia nitrogen according to the present application.

[0032] Figure 6 Figure 1 is a schematic diagram of the wastewater recovery process of the first embodiment of the wastewater treatment equipment control system based on the dialysis-denitrification of high ammonia nitrogen according to the present application.

[0033] Figure 7 Figure 1 is a schematic diagram of the temperature adjustment tank of the third embodiment of the wastewater treatment equipment control system based on the dialysis-denitrification of high ammonia nitrogen according to the present application.

[0034] Figure 8 Figure 1 is a schematic diagram of the temperature adjustment tank of the third embodiment of the wastewater treatment equipment control system based on the dialysis-denitrification of high ammonia nitrogen according to the present application. DETAILED DESCRIPTION

[0035] The following is further described in detail through specific embodiments:

[0036] The labels in the drawings of the specification include: controller 1, data acquisition module 2, pretreatment module 3, comprehensive analysis module 4, feedback adjustment module 5, storage unit 6, control unit 7, civil water collecting tank 8, security filter 9, raw water tank 10, clean water tank 11, metering pump 12, pH value measurer 13, alkali dilution tank 14, alkali tank 15, acid dilution tank 16, acid tank 17, ammonia nitrogen enrichment device 18, ammonia nitrogen recovery device 19, heating wire 20, temperature adjusting tank 21, temperature detector 22, inner wall 23, drainage groove 24.

[0037] Example 1:

[0038] This embodiment is basically as shown in the accompanying Figure 1 : a high ammonia nitrogen wastewater treatment equipment control system based on dialysis-denitrification, comprising a controller 1, and a data acquisition module 2, a pretreatment module 3, a comprehensive analysis module 4 and a feedback adjustment module 5 connected with the controller 1 respectively;

[0039] The data acquisition module 2 is used for real-time acquisition of operation parameters of each link of the wastewater treatment equipment;

[0040] The pretreatment module 3 is used for data pretreatment of the acquired operation parameters, including screening, sorting and deleting abnormal data of the acquired data, and finally obtaining an effective data set;

[0041] The comprehensive analysis module 4 is used for comprehensive analysis of the operation state of the wastewater treatment equipment and the ammonia nitrogen recovery state according to the effective data set; the comprehensive analysis of the ammonia nitrogen recovery state is to compare and analyze the liquid concentration and ammonia nitrogen content in the wastewater treatment equipment, to obtain the removal rate and recovery rate of ammonia nitrogen in a single cycle process of the wastewater treatment equipment, the removal rate is calculated by comparing the ammonia nitrogen content of the circulating water inlet and the circulating water outlet of the wastewater storage device, and the recovery rate is calculated by comparing the ammonia nitrogen content of the recovered product in the permeate storage device with the ammonia nitrogen content of the raw water in the wastewater storage device;

[0042] The feedback adjustment module 5 generates an adjustment strategy of the operation parameters according to the analysis result obtained by the comprehensive analysis module 4, and intelligently adjusts and controls the operation parameters;

[0043] The controller 1 comprises a storage unit 6 and a control unit 7, the storage unit 6 is used for storing various data in the system, and the control unit 7 is used for controlling the normal operation of the wastewater treatment equipment.

[0044] As shown in the accompanying Figure 2As shown, the wastewater treatment equipment includes a wastewater storage device, a receiving liquid storage device, a permeate storage device, an ammonia nitrogen enrichment device 18 and an ammonia nitrogen recovery device 19; the ammonia nitrogen enrichment device 18 is installed between the wastewater storage device and the receiving liquid storage device, and they are connected through circulation pipelines; the ammonia nitrogen recovery device 19 is installed between the receiving liquid storage device and the permeate storage device, and they are connected through circulation pipelines, and an electromagnetic valve is installed in each circulation pipeline.

[0045] Meanwhile, a clean water tank 11 is also installed, the pipelines of the clean water tank 11 are connected with the water outlet pipeline of the receiving liquid storage device and the water outlet pipeline of the permeate storage device respectively, and an electromagnetic valve is installed in the pipelines; when the ammonia nitrogen enrichment device 18 and the ammonia nitrogen recovery device 19 and the pipelines and devices in the equipment need to be cleaned, the clean water in the clean water tank 11 is used to clean the above-mentioned equipment, so as to maintain the cleanliness of the equipment and ensure the effect of ammonia nitrogen recovery of the wastewater.

[0046] As shown in the accompanying drawings, Figure 3 A security filter 9 is also installed on the water inlet pipeline of the wastewater storage device, and a civil water collecting pool 8 is also connected with the security filter 9; the civil water collecting pool 8 is used to collect landfill leachate and adjust and store the wastewater, so that the wastewater is more uniform, and the security filter 9 filters the wastewater entering the wastewater storage device to remove impurities in the water and avoid damaging the ammonia nitrogen enrichment device 18; a pH value measurer 13 and a flowmeter are also installed on the water outlet pipeline of the wastewater storage device.

[0047] As shown in the accompanying drawings, Figure 4 An alkali circulating pump and a flowmeter are installed on the loop of the receiving liquid storage device; the circulation pipelines of the receiving liquid storage device are connected with the receiving liquid storage device, the ammonia nitrogen enrichment device 18 and the ammonia nitrogen recovery device 19 respectively, and a pH value measurer 13 is also installed on the receiving liquid storage device and the water outlet pipeline. Meanwhile, the receiving liquid storage device is also connected with an alkali dilution tank 14 through a pipeline, which is used to supplement strong alkali solution into the receiving liquid storage device, and a flowmeter is installed between the two, and a flowmeter is also installed on the discharge port of the receiving liquid storage device, which is used to measure the waste alkali liquid discharged by the receiving liquid storage device.

[0048] As shown in the accompanying drawings, Figure 5 An acid circulating pump and a flowmeter are installed on the pipeline loop of the permeate storage device connected to the ammonia nitrogen recovery device 19, and a pH value measurer 13 is also installed on the permeate storage device and its circulation pipeline; the permeate storage device is also connected with an acid dilution tank 16 through a pipeline, which is used to supplement strong acid solution into the permeate storage device, and a flowmeter is installed between the two, and a flowmeter is also installed on the discharge port of the permeate storage device, which is used to measure the waste acid liquid discharged by the permeate storage device.

[0049] Specifically, in the embodiment, the wastewater storage device is a raw water tank 10 containing high-ammonia-nitrogen wastewater, the receiving liquid storage device is a lye tank 15 containing lye, and the permeate liquid storage device is an acid tank 17 containing acid; the ammonia-nitrogen enrichment device 18 is a stacked flat plate Donnan dialysis device, which includes a plurality of cation exchange membranes; and the ammonia-nitrogen recovery device 19 is a hollow fiber membrane distillation assembly.

[0050] Specifically, the operating parameters collected by the data collection module 2 include pH value, flow rate, flow volume, temperature, and ammonia-nitrogen content. The pH value mainly includes the pH value of the wastewater in the raw water tank 10, the pH value of the lye in the lye tank 15, and the pH value of the acid in the acid tank 17; the flow rate and flow volume are mainly measured for the liquid flowing from the lye tank 15 to the Donnan dialysis device and the distillation assembly and the liquid flowing from the acid tank 17 to the distillation assembly; the temperature is measured for the liquid in the pipeline system between the ammonia-nitrogen enrichment device 18 and the ammonia-nitrogen recovery device 19; and the ammonia-nitrogen content mainly includes the ammonia-nitrogen content of the wastewater in the raw water tank 10, the ammonia-nitrogen content of the effluent, and the ammonia-nitrogen content of the product finally recovered.

[0051] The principle of ammonia-nitrogen recovery in the scheme is that the wastewater in the raw water tank 10 is circulated from the Donnan dialysis device, and the cation exchange membrane in the Donnan dialysis device only allows ammonium ions to pass through, so that the ammonium ions react with the hydroxyl ions in the lye in the lye tank 15 to generate ammonia and water, and then the lye containing ammonia is transported to the distillation assembly, the ammonia passes through the gas-permeable hydrophobic membrane in the distillation assembly to enter the acid tank 17 to react with the acid to generate ammonium salt, thereby recovering and utilizing the ammonia-nitrogen in the wastewater.

[0052] The adjustment strategies generated in the feedback adjustment module 5 include pH value adjustment strategies, flow rate-flow volume adjustment strategies, and temperature adjustment strategies. Specifically,

[0053] The pH value adjustment strategy is to compare the detected pH value with the preset pH value range, and if it does not meet the requirement, to control the addition of the corresponding raw liquid to adjust the pH value. Specifically, the pH value of the wastewater in the raw water tank 10 is required to be less than 7, if the detected pH value is greater than 7, then the pH value is adjusted by adding acid to the raw water tank 10 through the controller 1, so that it remains in a state of less than 7; the pH value in the lye tank 15 is required to be greater than 12, if the detected pH value is less than 12, then the pH value is adjusted by adding lye to the lye tank 15; and the pH value in the acid tank 17 is required to be less than 4, if the detected pH value is greater than 4, then the pH value is adjusted by adding acid to the acid tank 17.

[0054] The flow rate adjustment strategy is to adjust the flow rate or flow volume of the liquid circulating in the circulating pipeline according to the detected ammonia-nitrogen recovery state. Specifically, the removal rate and the recovery rate of ammonia-nitrogen are mainly detected. The removal rate is calculated by detecting the ammonia-nitrogen content of the effluent and the influent of the wastewater in the raw water tank 10. If the removal rate is too low, the flow rate or flow volume of the wastewater in the circulating pipeline is increased by the controller 1. The recovery rate is calculated by comparing the nitrogen content in the final ammonium salt product with the ammonia-nitrogen content of the raw water in the raw water tank 10 after the ammonia-nitrogen content is converted into the concentration of ammonia. If the recovery rate is too low, the flow rate or flow volume is adjusted accordingly.

[0055] The temperature adjustment strategy is to dynamically adjust the outflow parameters of the receiving liquid storage device according to the comparison result of the detected temperature of the liquid in the lye circulating pipeline and the preset standard temperature. Specifically, the standard temperature is 35-40°C. Within this temperature range, it is more conducive to the escape of ammonia from water for recovery. Therefore, when the detected temperature is lower than 35°C, it is not conducive to the escape of ammonia. Therefore, to avoid the flow rate of the liquid in the pipeline being too large at low temperature, which reduces the ammonia-nitrogen recovery rate and recovery rate, the outflow flow rate of the lye tank 15 flowing to the distillation assembly needs to be dynamically adjusted according to the real-time temperature, so as to maximize the ammonia-nitrogen recovery rate in a single cycle.

[0056] Specifically, if the current temperature is within the range of 35-40°C, the tangential flow rate of the membrane of the ammonia-nitrogen enrichment device 18 and the tangential flow rate of the membrane of the dialysis device are controlled to be the standard flow rate of 0.1 cm / s. If the current temperature is lower than 35°C, the outflow flow rate of the receiving liquid storage device is adjusted according to the difference between the current temperature and the standard temperature. If the current temperature is lower than 60% of the standard temperature, the outflow flow rate of the receiving liquid storage device is reduced to 50%-70% of the standard flow rate. If the current temperature is within 60%-80% of the standard temperature, the outflow flow rate of the receiving liquid storage device is reduced to 70%-85% of the standard flow rate. If the current temperature is within 80%-95% of the standard temperature, the outflow flow rate of the receiving liquid storage device is reduced to 90% of the standard flow rate.

[0057] Through the above operation, the amount of ammonia water flowing from the lye tank 15 to react with the acid liquid is controlled in real time according to the real-time change of the temperature, so that the ammonia-nitrogen in a single cycle is all absorbed, thereby avoiding the repeated recovery of ammonia-nitrogen into the lye tank 15, which not only reduces the overall recovery efficiency, but also makes the subsequent operation of supplementing the raw liquid to the lye tank 15 and the acid tank 17 more complex, and increases the ammonia-nitrogen recovery cost to some extent. By real-time feedback adjustment through temperature, the above situation can be completely avoided, the efficiency and recovery rate of ammonia-nitrogen recovery are improved, and the economic cost of recovery is reduced.

[0058] In this embodiment, the alkali solution can use sodium hydroxide and other conventional alkaline solution, not only easy to obtain and low cost; acid solution using common market sulfuric acid.

[0059] The pH value measuring device 13 is a pH detector of model SUP-pH6.3; the electromagnetic valve is of model DN40 or DN32.

[0060] The specific implementation process of this embodiment is as follows:

[0061] As shown in the accompanying Figure 4 As shown in the accompanying

[0062] 1) Influent: the high ammonia-nitrogen wastewater to be treated is filtered through the security filter 9 from the civil water collecting pool 8 and then loaded into the raw water tank 10. The pH value of the raw water (i.e. untreated wastewater) is measured and determined whether it is less than 7. If it is greater than 7, acid is added to the raw water tank 10 for pH adjustment.

[0063] 2) Ammonia-nitrogen enrichment: after the pH value of the raw water meets the requirements, the wastewater treatment equipment is started. The raw water in the raw water tank 10 is controlled to flow to the stacked flat plate Donnan dialysis device, and the alkali solution in the alkali solution tank 15 is controlled to flow into the Donnan dialysis device. The ammonium ions in the raw water enter the alkali solution from the cation exchange membrane in the Donnan dialysis device and react with the hydroxyl ions to generate ammonia and water. Then it is detected whether the temperature of the liquid is greater than 35℃. If yes, the tangential flow rate of the membrane of the alkali solution tank 15 flowing to the Donnan dialysis device is controlled to be the standard flow rate. If not, the difference between the current temperature and the standard temperature is adjusted to the liquid flow rate of the alkali solution tank 15.

[0064] 3) Alkali solution circulation: the alkali solution that loses ammonium ions returns to the alkali solution tank 15 again through the circulating pipeline, and after measuring the pH value, strong alkali is added to the alkali solution tank 15 to make the pH value of the liquid in the alkali solution tank 15 greater than 12, forming the recycling of the alkali solution.

[0065] 4) Ammonia-nitrogen recovery: the alkali solution containing ammonia gas is controlled to enter the distillation assembly, and the sulfuric acid in the acid tank 17 is controlled to enter the distillation assembly. The ammonia gas escapes from the water and reacts with the sulfuric acid through the gas-permeable hydrophobic membrane in the distillation assembly to generate ammonium sulfate, completing the recovery of ammonia-nitrogen; at the same time, the alkali solution that loses ammonia gas returns to the alkali solution tank 15 again from the distillation assembly, forming the recycling.

[0066] 5) Acid solution circulation: the acid solution after reacting with ammonia gas returns to the acid tank 17 again from the distillation assembly through the circulating pipeline, and after measuring the pH value, strong acid is added to the acid tank 17 according to the pH value to make the pH value of the liquid in the acid tank 17 return to less than 4, forming the recycling of the acid solution.

[0067] 6) removal rate and recovery rate: removal rate, compare and calculate the ammonia nitrogen content of the circulating water inlet and the circulating water outlet of the wastewater in the raw water tank 10; recovery rate, detect the nitrogen content in the final obtained ammonium sulfate product, and then compare and calculate the ammonia concentration with the outlet ammonia nitrogen content of the wastewater in the raw water tank 10.

[0068] In summary, the present application has the following beneficial effects:

[0069] 1) The recovery process of the high ammonia nitrogen wastewater treatment equipment based on dialysis-denitrification adopted can realize the removal and recovery of ammonia nitrogen in wastewater at the same time.

[0070] 2) Compared with simple control operation alone, the control system in the present application can feedback and adjust the corresponding operation settings by real-time detection and analysis of the state, parameters and ammonia nitrogen recovery of the equipment in the current recovery process, thereby improving the speed, removal rate and recovery rate of ammonia nitrogen recovery, which can effectively remove ammonia nitrogen in ammonia nitrogen wastewater, and the removal rate can be as high as 95%, and the recovery rate can be as high as 90%.

[0071] 3) Through the precise control system, all the ammonia nitrogen in the wastewater in a single cycle process can be recovered and treated, thereby avoiding residual recirculation to the raw liquid tank, which not only has low recovery efficiency, but also makes the whole recovery operation more difficult.

[0072] 4) Through the present application, ammonium ions are enriched from complex components, then migrated in the form of ammonia gas, and finally recovered in the form of ammonium ions, which realizes the purpose of extracting and preparing high-purity nitrogen from multi-component mixed sewage, and the supporting recovery auxiliary materials adopted have low price, the overall ammonia nitrogen recovery cost is low, the additional value of the recovered product is high, which has important significance for sustainable development of the society.

[0073] Example two:

[0074] This example is basically the same as example one, the difference is:

[0075] A heater is also installed on the lye circulating pipeline, and a temperature detector 22 is also installed inside the circulating pipeline, which detects the temperature of the liquid in the lye circulating pipeline and compares it with the preset standard temperature, and dynamically adjusts the flow rate of the liquid in the circulating pipeline according to the comparison result. After the reaction of ammonium ions and lye produces lye containing ammonia, heating is used to make ammonia escape from water in large quantities, so as to be absorbed by the subsequent acid liquid for ammonia nitrogen recovery, thereby improving the ammonia nitrogen recovery rate and recovery rate.

[0076] Specifically, in the temperature regulation strategy, if the detected temperature is lower than 35℃, it is not conducive to the ammonia escape, so the caustic lye tank 15 needs to be heated, and in the heating process, to avoid the equipment stop working and cause the recovery rate to decrease, the liquid in the pipeline is still flowing to recover ammonia nitrogen, and in order to improve the ammonia nitrogen recovery rate and recovery rate as much as possible, the outflow flow rate of the caustic lye tank 15 flowing to the distillation assembly needs to be dynamically adjusted according to the real-time heating temperature.

[0077] Specifically, when the temperature is lower than 35℃, the heater is started to heat the liquid in the caustic lye circulating pipeline, and the temperature detector 22 is used to detect the temperature in real time, and the outflow flow rate is adjusted according to the detected temperature. If the current temperature is lower than 60% of the standard temperature, the outflow flow rate of the receiving liquid storage device is adjusted to 50%-70% of the standard flow rate; if the current temperature is 60%-80% of the standard temperature, the outflow flow rate of the receiving liquid storage device is adjusted to 70%-85% of the standard flow rate; if the current temperature is 80%-95% of the standard temperature, the outflow flow rate of the receiving liquid storage device is adjusted to 90% of the standard flow rate; if the current temperature is heated to recover to the standard temperature, the tangential flow rate of the membrane of the ammonia nitrogen enrichment device 18 and the tangential flow rate of the membrane of the dialysis device are restored to the standard flow rate of 0.1 cm / s.

[0078] In the conventional recovery equipment, the temperature of the liquid in the caustic lye circulating pipeline is not monitored in real time and dynamically feedback adjusted, but in this scheme, considering that the temperature of the liquid is increased, which is more conducive to the escape of ammonia in water, a heater is installed on the caustic lye circulating pipeline, and the liquid flow rate is controlled according to the real-time detection of the liquid temperature, so that all the ammonia nitrogen carried in the liquid in a single cycle can be recovered, thereby maximizing the ammonia nitrogen recovery rate and recovery rate, and improving the economic benefit of the recovery equipment.

[0079] Embodiment three:

[0080] This embodiment is basically the same as embodiment two, the difference is:

[0081] As shown in the accompanying drawings Figure 7 The heater selects the heating wire 20, and the heating wire 20 is wound on the caustic lye circulating pipeline to improve the heating effect of the liquid in the pipeline as much as possible, so that the temperature heating is more uniform. At the same time, a temperature regulation tank 21 is arranged between the caustic lye tank 15 and the ammonia nitrogen recovery device 19, which is used to temporarily store the liquid flowing from the caustic lye tank 15 to the ammonia nitrogen recovery device 19, and the actual temperature of the liquid is detected by the temperature detector 22 arranged in the temperature regulation tank 21, and the actual temperature is compared with the preset standard temperature, and the flow rate of the liquid in the circulating pipeline and the heating temperature of the heater are dynamically adjusted according to the comparison result.

[0082] Specifically, as shown in the accompanying drawings Figure 8 The temperature adjusting tank 21 is a cylindrical tank body, a spiral downward flow guide groove 24 is opened on the inner wall 23 of the tank body, and the liquid outlet pipeline of the lye tank 15 (i.e. the water inlet pipeline of the temperature adjusting tank 21) is communicated to the upper end of the temperature adjusting tank 21, and the water outlet pipeline of the temperature adjusting tank 21, i.e. the pipeline communicated to the ammonia nitrogen recovery device 19, is arranged at the lower end of the temperature adjusting tank 21. In this way, when the liquid heated from the liquid outlet pipeline of the lye tank 15 enters the temperature adjusting tank 21, the potential energy can be sufficiently increased, so that the impact force of the liquid falling into the temperature adjusting tank 21 is stronger, the rolling effect is better, and the liquid mixing effect is better, i.e. the temperature of the liquid is homogenized, so that the real liquid temperature can be measured. At the same time, the design of the spiral flow guide groove 24 on the inner wall 23 can also improve the impact and rolling effect of the liquid after falling into the temperature adjusting tank 21, so that the temperature of the liquid is more balanced. The water inlet pipeline and the water outlet pipeline of the temperature adjusting tank 21 are both provided with a metering pump 12 for controlling the flow rate of the liquid. On the other hand, a heat preservation layer is arranged on the outer surface of the temperature adjusting tank 21, for example, a layer of heat preservation cotton is wrapped, or a heat preservation coating is coated on the inner wall of the temperature adjusting tank 21, so as to increase the heat preservation performance of the temperature adjusting tank 21, avoid heat loss caused by rolling and impact of the heated liquid after entering the temperature adjusting tank 21, and thus ensure the heating effect of the liquid.

[0083] In the specific working process, the heating temperature of the heating wire 20 is set to 35℃, the liquid is heated and then flows into the temperature adjusting tank 21, and then the temperature detector 22 is used to detect the temperature of the liquid in the temperature adjusting tank 21 in real time and compare it with the standard temperature 35-40℃. If it is detected that the temperature is lower than 35℃, it indicates that when the heating wire 20 heats the liquid, only the periphery of the liquid column is heated, and the heating effect of the center part of the liquid column is not ideal. Therefore, after the liquid enters the temperature adjusting tank 21 for rolling and mixing, the actual temperature does not reach the ideal 35℃. At this time, on the one hand, the heating temperature of the heating wire 20 is increased, and on the other hand, the flow rate of the liquid in the water inlet pipeline and the water outlet pipeline of the temperature adjusting tank 21 is controlled, so as to control the amount and liquid level of the liquid temporarily stored in the temperature adjusting tank 21, thereby realizing feedback regulation of the temperature of the liquid in the temperature adjusting tank 21, keeping it at the preset standard temperature at all times, making ammonia capable of escaping from water in large quantities for recovery, and finally improving the ammonia nitrogen recovery rate and recovery rate.

[0084] The applicant found through research that the escape speed of ammonia gas from water can be enhanced with the increase of liquid temperature, so the applicant thought of heating the liquid, and after adding temperature detection and liquid heating device, ammonia gas can be more easily and quickly escaped from water, so as to quickly carry out the recovery reaction, and to a certain extent, improve the speed and recovery rate of ammonia nitrogen recovery. However, during the actual test stage, the applicant found a new problem, that is, because the liquid is always in a flowing state during heating, the temperature of the liquid rises unevenly, and the heating effect is not ideal, and the inner diameter of the pipeline also affects the heating of the liquid, so that the liquid near the inner wall 23 of the pipeline is heated to the preset temperature, while the center of the liquid does not have enough heating time to heat, so that the overall temperature of the liquid does not reach the preset temperature, which affects the recovery of ammonia nitrogen to a certain extent.

[0085] Therefore, the applicant has carried out a large number of experimental researches on the heating function or form of the liquid, not only to improve the heating effect, but more importantly to have practical value, such as the consideration of technical implementation difficulty and cost factors. It is found by comparison that if the liquid flow rate is reduced, the heating effect can be improved, but the efficiency of the device for ammonia nitrogen recovery of wastewater as a whole is reduced, and if the heating method is improved to ensure that the flow rate remains unchanged, for example, the heater is arranged inside the pipeline, the design, installation and sealing of the device are required to be higher, which increases the overall recovery cost significantly, and the heater is immersed in the liquid for a long time, which has safety hazards, so this method is not desirable.

[0086] Through a series of tests by the applicant, it is finally found that the heating form of heating wire winding pipeline can not only increase the heating effective area, but also increase the path length of the heating wire winding pipeline, so that the heating path of the liquid is longer and the heating time is increased, thereby effectively enhancing the heating effect of the liquid. Therefore, in the present scheme, the heating wire 20 is used as a heater, and the heating wire 20 is wound on the pipeline, which can improve the heating effect to a certain extent, make the temperature more uniform, further protect the heating effect of the liquid, and additionally provide a temperature adjusting tank 21, so that the liquid heated by the temperature is temporarily stored in the temperature adjusting tank 21, and through the design of height difference, flow rate, spiral inner wall 23, etc., the liquid is fully mixed in the temperature adjusting tank 21, so as to make the liquid temperature uniform and stable. On the other hand, after the liquid flows into the temperature adjusting tank 21, the tank body is not filled with liquid, so there is still a part of space in the tank body, although the rolling and impact of the liquid will cause a part of heat loss, but this part of heat will be attached to the water mist generated by the rolling, so as to fill the space in the tank, so that the overall environment temperature in the tank does not decrease, and the heat loss of the liquid after heating and entering the temperature adjusting tank 21 is very small, thereby ensuring the heating effect of the liquid.

[0087] Finally, the temperature of the liquid in the temperature-adjusting tank 21 is detected and compared with the preset standard temperature to feedback adjust the heating temperature of the heating wire 20 and the flow rate of the liquid, so as to dynamically control the whole recovery process in real time, so that the ammonia nitrogen in the liquid in a single cycle is all recovered, and the rate and recovery rate of ammonia nitrogen recovery are maximized.

[0088] Embodiment Four:

[0089] The embodiment is basically the same as embodiment one, and the difference is that:

[0090] The storage unit 6 of the controller 1 stores the running data of the equipment in a single cycle as a minimum unit when storing data, and integrates and analyzes the data of multiple minimum units, and feeds back to adjust and optimize the subsequent equipment running parameters according to the analysis results.

[0091] Specifically, in the embodiment, the running data of every 50 cycles is selected as an analysis sample, and after comprehensive big data analysis of the data of the 50 times, the standard parameter value of the ammonia nitrogen removal rate and recovery rate optimal point is found, and the equipment is adjusted and controlled on the basis of the standard parameter value to improve the ammonia nitrogen recovery effect in the subsequent process.

[0092] Through such a setting, the error of the equipment running parameters can be reduced as much as possible through segmented data analysis to improve the ammonia nitrogen recovery effect, and at the same time, the automation and self-optimization of the system control precision can be realized to ensure that the ammonia nitrogen recovery effect of the equipment in the wastewater is always in the best state.

[0093] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme are not described in detail, and the ordinary technical personnel in the art know all the ordinary technical knowledge in the art before the application date or the priority date, can know all the prior art in the field, and have the ability to apply conventional experimental means before that date, and the ordinary technical personnel in the art can improve and implement the scheme under the guidance of the present application, and some typical known structures or known methods should not be an obstacle for the ordinary technical personnel in the art to implement the present application. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope of the present application should be subject to the content of its claims, and the specific embodiments in the description can be used to explain the content of the claims.

Claims

1. A control system for a high ammonia nitrogen wastewater treatment device, characterized in that: The wastewater treatment equipment includes a wastewater storage device, a receiving liquid storage device, and a permeate storage device. An ammonia nitrogen enrichment device is connected to the wastewater storage device and the receiving liquid storage device via a circulation pipeline. An ammonia nitrogen recovery device is also connected to the receiving liquid storage device and the permeate storage device via a circulation pipeline. Flow meters and metering pumps are installed on the circulation pipelines between the wastewater storage device and the receiving liquid storage device, and between the receiving liquid storage device and the permeate storage device. A pH meter is installed in each of the wastewater storage device, the receiving liquid storage device, and the permeate storage device. The receiving liquid storage device is also equipped with a heater, and a temperature detector is installed inside it; The heater is a heating wire, which is wound around the alkaline circulation pipe between the receiving liquid storage device and the ammonia nitrogen recovery device. A temperature regulating tank is set between the receiving liquid storage device and the ammonia nitrogen recovery device, and the temperature detector is set inside the temperature regulating tank. The temperature regulating tank is a cylindrical tank with a spiral downward drainage groove on the inner wall of the tank. The liquid outlet pipe of the receiving liquid storage device is connected to the upper end of the temperature regulating tank, and the water outlet pipe of the temperature regulating tank is set at the lower end of the temperature regulating tank. The control system includes a controller, and a data acquisition module, a preprocessing module, a comprehensive analysis module, and a feedback adjustment module, which are respectively connected to the controller. The feedback adjustment module generates an adjustment strategy for the operating parameters based on the analysis results obtained by the comprehensive analysis module, and performs intelligent adjustment and control on the operating parameters. The regulation strategies include pH regulation strategy, flow rate-volume regulation strategy and temperature regulation strategy; The temperature regulation strategy is to dynamically adjust the outlet parameters of the receiving liquid storage device based on the comparison between the detected temperature of the liquid in the alkaline circulation pipeline and the preset standard temperature. The discharge parameters of the dynamically adjusted receiving liquid storage device are as follows: if the current temperature is detected to be within the standard temperature, the discharge flow rate of the receiving liquid storage device is controlled to be the standard flow rate; if the current temperature is lower than the standard temperature, the discharge flow rate of the receiving liquid storage device is adjusted according to the ratio of the difference between the current temperature and the standard temperature. The standard temperature is 35-40℃; the standard flow rate is 0.05-0.2 cm / s; The ammonia nitrogen enrichment unit is a stacked flat plate type Daonan dialysis unit; the ammonia nitrogen recovery unit is a hollow fiber membrane distillation module. The method of adjusting the outlet flow rate of the receiving liquid storage device according to the ratio of the difference between the current temperature and the standard temperature is as follows: if the current temperature is lower than 60% of the standard temperature, the outlet flow rate of the receiving liquid storage device is reduced to 50%-70% of the standard flow rate; if the current temperature is between 60%-80% of the standard temperature, the outlet flow rate of the receiving liquid storage device is reduced to 70%-85% of the standard flow rate; if the current temperature is between 80%-95% of the standard temperature, the outlet flow rate of the receiving liquid storage device is reduced to 90% of the standard flow rate.

2. The control system of the high ammonia nitrogen wastewater treatment equipment according to claim 1, characterized in that: The data acquisition module is used to collect the operating parameters of each stage in the wastewater treatment equipment in real time. The preprocessing module is used to preprocess the collected operating parameters to obtain a valid dataset; The comprehensive analysis module performs a comprehensive analysis of the operating status of the wastewater treatment equipment and the ammonia nitrogen recovery status based on the valid dataset. The controller includes a storage unit and a control unit. The storage unit is used to store various data in the system, and the control unit is used to control the normal operation of the wastewater treatment equipment. The operating parameters include pH value, flow rate, flow rate, temperature, and ammonia nitrogen content; The pH adjustment strategy is to compare the detected pH value with a preset pH range, and if it does not meet the range, control the increase of the corresponding stock solution to adjust the pH value. The flow rate-flow rate regulation strategy is to adjust the flow rate or flow rate of the liquid circulating in the circulation pipeline according to the detected ammonia nitrogen recovery status. The comprehensive analysis of ammonia nitrogen recovery status involves detecting and comparing the ammonia nitrogen content in the wastewater treatment equipment to obtain the removal rate and recovery rate of ammonia nitrogen during a single cycle of the wastewater treatment equipment. The removal rate is calculated by comparing the ammonia nitrogen content of the circulating influent and circulating effluent of the wastewater storage device; the recovery rate is calculated by comparing the ammonia nitrogen content of the recovered product obtained in the permeate storage device with the ammonia nitrogen content of the raw water in the wastewater storage device.

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