Ammonia nitrogen wastewater treatment device
By employing heating stripping, chemical precipitation, and breakpoint chlorination, the problem of low treatment efficiency for high-concentration ammonia nitrogen wastewater has been solved, achieving highly efficient ammonia nitrogen removal, which is suitable for industrial wastewater treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG SHUIQING ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-09
AI Technical Summary
Existing ammonia nitrogen wastewater treatment devices are inefficient and have poor ammonia nitrogen removal effects when treating high-concentration ammonia nitrogen wastewater. They are also difficult to treat and affect the water environment and water-using equipment.
The process employs a heated stripping unit for stripping, a chemical precipitation unit for precipitation, and finally a breakpoint chlorination unit for oxidation. By combining pH meters, thermometers, and ammonia nitrogen monitors to optimize the operating conditions of each step, ammonia nitrogen removal can be achieved efficiently.
It achieves efficient and thorough treatment of high-concentration ammonia nitrogen wastewater, reducing the ammonia nitrogen concentration from 5000 mg/L to 0.5-2 mg/L, thus improving treatment efficiency and removal effect.
Smart Images
Figure CN224337424U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment, and in particular to an ammonia nitrogen wastewater treatment device. Background Technology
[0002] Water pollution is one of the major global problems. With global economic development and urbanization, the demand for water is constantly increasing, leading to a corresponding increase in wastewater discharge. Among environmental pollution sources, industrial wastewater has the greatest impact. As my country's industry develops, the discharge of industrial wastewater is also increasing, and my country is also facing the problem of serious wastewater pollution of water bodies.
[0003] Ammonia nitrogen is one of the most harmful forms of nitrogen and a marker of water pollution. Ammonia nitrogen in water refers to combined ammonia nitrogen existing in the form of ammonia (NH3) or ammonium (NH4+) ions. Ammonia nitrogen pollution in water bodies has attracted widespread attention both domestically and internationally. Currently, my country's ammonia nitrogen emissions far exceed the environmental capacity of receiving water bodies, resulting in high pollution loads and a high risk of ammonia nitrogen levels exceeding standards in surface water. Excessive ammonia nitrogen in water bodies not only causes water pollution, eutrophication, and red tides, but also leads to the proliferation of microorganisms in water-using equipment during industrial wastewater treatment and reuse projects, forming bioscale that clogs pipes and equipment.
[0004] High-concentration ammonia nitrogen wastewater has a wide range of sources (petrochemical, mining, coking, printing and dyeing, pigment, rare earth industries, etc. all discharge high-ammonia nitrogen wastewater), complex composition, high toxicity, great environmental harm, and great difficulty in treatment. If it is oxidized, the nitrates and nitrites produced can also affect the health of aquatic organisms and even humans, making it one of the most difficult wastewaters to treat in the world.
[0005] Existing ammonia nitrogen wastewater treatment devices suffer from low treatment efficiency and poor ammonia nitrogen removal effect when treating high-concentration ammonia nitrogen wastewater. Utility Model Content
[0006] Based on this, the purpose of this utility model is to provide an ammonia nitrogen wastewater treatment device, which first performs stripping treatment through a heating stripping unit, then performs precipitation treatment through a chemical precipitation unit, and finally performs oxidation treatment through a breakpoint chlorination unit, thereby achieving efficient and thorough treatment of high-concentration ammonia nitrogen wastewater.
[0007] A device for treating ammonia nitrogen wastewater includes a heating stripping unit, a chemical precipitation unit, and a breakpoint chlorination unit. The heating stripping unit includes a stripping section and a stripping heating section. The stripping section performs stripping treatment on the ammonia nitrogen wastewater. The stripping heating section is fixed to the stripping section and heats the stripping section. The chemical precipitation unit includes a precipitation reactor. The inlet of the precipitation reactor is connected to the wastewater outlet of the stripping section. The precipitation reactor is provided with a precipitant inlet. The precipitation reactor is used to perform chemical precipitation treatment on the ammonia nitrogen wastewater from the stripping section. The breakpoint chlorination unit includes an oxidation reactor. The inlet of the oxidation reactor is connected to the wastewater outlet of the precipitation reactor via a pipeline. The oxidation reactor is provided with an oxidant inlet. The oxidation reactor is used to oxidize the ammonia nitrogen wastewater from the precipitation reactor.
[0008] The ammonia nitrogen wastewater treatment device of this invention first performs stripping treatment through a heating stripping unit, then performs precipitation treatment through a chemical precipitation unit, and finally performs oxidation treatment through a breakpoint chlorination unit, thereby achieving efficient and thorough treatment of high-concentration ammonia nitrogen wastewater.
[0009] Furthermore, the heated stripping unit also includes a first pH meter and a thermometer. Both the first pH meter and the thermometer are fixed to the stripping section. The detection ends of both the first pH meter and the thermometer are located inside the stripping section, with the detection end of the first pH meter positioned near the bottom of the stripping section. The stripping section also has an alkali feeding port. The first pH meter detects the pH value of the wastewater within the stripping section, which, in conjunction with the alkali feeding port, facilitates the adjustment of the pH value by operators, thereby improving stripping efficiency and optimizing the stripping effect. The thermometer detects the temperature within the stripping section, which helps operators control the temperature, further improving stripping efficiency and optimizing the stripping effect.
[0010] Furthermore, the chemical precipitation unit also includes a second pH meter, which is fixed to the precipitation reactor. The detection end of the second pH meter is located inside the precipitation reactor, which is also equipped with an acid feed port. The use of the second pH meter to detect the pH value of the wastewater in the precipitation reactor, in conjunction with the acid feed port, facilitates the adjustment of the pH of the wastewater within the reactor by operators, thereby improving the precipitation effect and the degree of ammonia nitrogen removal.
[0011] Furthermore, the system also includes a first ammonia nitrogen monitor, a second ammonia nitrogen monitor, and a third ammonia nitrogen monitor. The first ammonia nitrogen monitor is fixed to the stripping unit, with its detection end located inside the stripping unit. The second ammonia nitrogen monitor is fixed to the precipitation reactor, with its detection end located inside the precipitation reactor. The third ammonia nitrogen monitor is fixed to the oxidation reactor, with its detection end located inside the oxidation reactor. By setting up the first, second, and third ammonia nitrogen monitors to monitor the ammonia nitrogen concentration of the wastewater in the stripping unit, the precipitation reactor, and the oxidation reactor, respectively, operators can easily determine the degree of stripping, precipitation, and oxidation of the wastewater based on the ammonia nitrogen concentration. This allows operators to select the appropriate degree of stripping, precipitation, and oxidation to improve ammonia nitrogen removal efficiency and control the degree of ammonia nitrogen removal.
[0012] Furthermore, the system also includes an ammonia absorption unit, which comprises an absorption tank and a first absorption fan. The input end of the first absorption fan is connected to the outlet of the stripping section via a pipeline, and the pipeline connected to the output end of the first absorption fan extends into the absorption tank and is positioned near the bottom of the absorption tank. The ammonia vapor generated in the stripping section is transported to the absorption tank containing dilute sulfuric acid by the first absorption fan, causing the ammonia to react with the dilute sulfuric acid to produce ammonium sulfate, thereby achieving the absorption of ammonia.
[0013] Furthermore, the ammonia absorption unit also includes an evaporator, an evaporation heating unit, and a second absorption fan. The outlet of the absorption tank is connected to the interior of the evaporator via a pipeline. The evaporation heating unit is fixed to the evaporator and heats it. The input end of the second absorption fan is connected to the interior of the evaporator via a pipeline, and the pipeline connected to the output end of the second absorption fan extends into the interior of the absorption tank and is positioned near the bottom. The evaporator evaporates the ammonia in the ammonium sulfate solution as ammonia vapor through heating, and the vapor is then transported back to the absorption tank by the second absorption fan for absorption, thus achieving complete absorption of the ammonia.
[0014] Furthermore, the system also includes a steam blower and a condensate pump. The stripping heating section is a steam heating section, and the evaporation heating section is a water bath heating section. The input end of the steam blower is connected to the upper part of the water bath heating section via a pipeline, and the output end of the steam blower is also connected to the upper part of the steam heating section via a pipeline. The input end of the condensate pump is connected to the bottom of the steam heating section via a pipeline, and the output end of the condensate pump is connected to the water bath heating section. The steam generated in the water bath heating section is transported to the steam heating section by the steam blower, making full use of the steam's thermal energy. The condensate pump is used to transport the condensate generated in the steam heating section to the water bath heating section, making full use of water resources.
[0015] Furthermore, it also includes a first heat exchanger and a second heat exchanger. The hot fluid inlet of the first heat exchanger is connected to the wastewater outlet of the stripping section, and the hot fluid outlet of the first heat exchanger is connected to the hot fluid inlet of the second heat exchanger through a pipeline. The cold fluid inlet of the first heat exchanger is used to input the ammonia nitrogen wastewater, and the cold fluid outlet of the first heat exchanger is connected to the wastewater inlet of the stripping section through a pipeline. The hot fluid outlet of the second heat exchanger is connected to the water inlet of the precipitation reactor through a pipeline, and the cold fluid inlet of the second heat exchanger is connected to the output of the oxidation reactor. The first heat exchanger allows the effluent from the stripping section to exchange heat with the initial ammonia nitrogen wastewater. Utilizing the heat from the effluent from the stripping section to heat the ammonia nitrogen wastewater helps raise its temperature to the preset temperature more quickly, improving treatment efficiency and reducing energy consumption for heating the ammonia nitrogen wastewater. Furthermore, the second heat exchanger allows the effluent from the oxidation reactor to exchange heat polarity with the effluent from the hot fluid outlet of the first heat exchanger. Utilizing the effluent from the oxidation reactor to cool the ammonia nitrogen wastewater about to enter the precipitation reactor helps lower its temperature to a suitable level more quickly, further improving treatment efficiency.
[0016] Furthermore, it also includes a first water storage tank and a second water storage tank. The input end of the first water storage tank is connected to the output end of the stripping section via a pipeline, and the output end of the first water storage tank is connected to the hot fluid inlet of the first heat exchanger via a pipeline. The input end of the second water storage tank is connected to the output end of the oxidation reactor via a pipeline, and the output end of the second water storage tank is connected to the cold fluid inlet of the second heat exchanger via a pipeline. The first water storage tank stores the effluent from the stripping section, allowing ammonia nitrogen wastewater to re-enter the stripping section after it has been emptied, thus preventing the mixing of untreated and treated ammonia nitrogen wastewater during the heat exchange process and improving ammonia nitrogen removal efficiency. The second water storage tank stores the effluent from the oxidation reactor. On the one hand, the effluent from the oxidation reactor can be cooled in the second water storage tank, which helps improve its heat exchange effect in the second heat exchanger. On the other hand, the second water storage tank acts as a buffer, ensuring that the water volume meets the heat exchange requirements of the second heat exchanger, thus ensuring the stability of the reaction efficiency.
[0017] Furthermore, the sodium hypochlorite supply unit has its output end connected to the interior of the oxidation reactor via a pipeline.
[0018] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the ammonia nitrogen wastewater treatment device according to one embodiment;
[0020] The components include: a stripping heating section 101, a stripping tower 102, a water distribution section 103, a stripping blower 104, a first heat exchanger 2, a first feed valve 3, a first drain pump 4, a first water storage tank 5, a first circulation valve 6, a first discharge valve 7, a second drain pump 8, an absorption tank 901, a gas distribution section 902, a first absorption blower 903, a liquid discharge pump 904, an evaporator 905, a second circulation valve 906, a second discharge valve 907, an evaporation heating section 908, a gas collection hood 909, a second absorption blower 910, a steam blower 10, a condensate pump 11, a sedimentation reactor 1201, a first stirring section 1202, a sludge discharge valve 1203, a second heat exchanger 13, a third drain pump 14, an oxidation reactor 1501, a second stirring section 1502, a fourth drain pump 16, a second water storage tank 17, a fifth drain pump 18, a discharge valve 19, and a heat exchange valve 20. Detailed Implementation
[0021] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.
[0022] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0023] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0024] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0025] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.
[0026] This utility model embodiment provides an ammonia nitrogen wastewater treatment device. Please refer to [link / reference]. Figure 1 The system includes a heating stripping unit, a first heat exchanger 2, a first feed valve 3, a first drain pump 4, a first water storage tank 5, a first circulation valve 6, a first discharge valve 7, a second drain pump 8, an ammonia absorption unit, a steam blower 10, a condensate pump 11, a chemical precipitation unit, a second heat exchanger 13, a third drain pump 14, a breakpoint chlorination unit, a sodium hypochlorite supply unit, a fourth drain pump 16, a second water storage tank 17, a fifth drain pump 18, a discharge valve 19, a heat exchange valve 20, a first ammonia nitrogen monitor, a second ammonia nitrogen monitor, and a third ammonia nitrogen monitor. The heating stripping unit is used to strip ammonia nitrogen wastewater, the ammonia absorption unit is used to absorb ammonia from the heating stripping unit, the chemical precipitation unit is used to chemically precipitate ammonia nitrogen wastewater from the heating stripping unit, and the breakpoint chlorination unit is used to oxidize ammonia nitrogen wastewater from the chemical precipitation unit.
[0027] The heated stripping unit includes a stripping section, a stripping heating section 101, a first pH meter, and a thermometer. The stripping section includes a stripping tower 102, a water distribution section 103, and a stripping blower 104. The lower part of the stripping tower 102 is provided with a drain outlet and an air inlet from bottom to top, and the upper part of the stripping tower 102 is provided with a water inlet, an air outlet, and an alkali feed inlet. The water distribution section 103 is located inside the stripping tower 102 and is arranged near the top of the stripping tower 102. The water distribution section 103 serves as the wastewater input end of the stripping section. In other embodiments, the stripping section does not include the water distribution section 103. At this time, the inlet of the stripping tower 102 is the wastewater input end of the stripping section; as a specific implementation, the water distribution section 103 of this embodiment includes a water distribution pipe and a nozzle connected to the water distribution pipe, with the nozzle facing the bottom of the stripping tower 102; the stripping blower 104 is located outside the stripping tower 102, and the output end of the stripping blower 104 is connected to the air inlet of the stripping tower 102 through a pipeline, so that air is blown from the air inlet to the air outlet of the stripping tower 102 by the stripping blower 104. As another feasible implementation, the stripping blower 104 is located at... Inside the stripping tower 102, the output end of the stripping blower 104 is positioned facing the air outlet of the stripping tower 102; the stripping heating unit 101 is fixed to the stripping tower 102 and is used to heat the stripping tower 102. In this embodiment, the stripping heating unit 101 is a steam heating unit, which heats the stripping unit through the heat of steam. As a specific implementation, the steam heating unit is a jacket located outside the stripping tower 102, and the jacket is heated by steam; both the first pH meter and the thermometer are fixed to the stripping tower 102. Both the detection end and the thermometer detection end are located inside the stripping tower 102. The detection end of the first pH meter is located near the bottom of the stripping tower 102 and below the liquid surface inside the stripping tower 102. The first pH meter is set to detect the pH value of the wastewater in the stripping section. In conjunction with the alkali feed port of the stripping section, it is beneficial for the staff to adjust the pH of the wastewater in the stripping section to improve stripping efficiency and optimize stripping effect. The thermometer is set to detect the temperature in the stripping section, which is beneficial for the staff to control the temperature in the stripping section to improve stripping efficiency and optimize stripping effect.
[0028] The cold fluid inlet of the first heat exchanger 2 is used to input ammonia nitrogen wastewater. The cold fluid outlet of the first heat exchanger 2 is connected to the first input end of the water distribution section 103 through a pipeline passing through the inlet of the stripping tower 102. The first feed valve 3 is installed on the pipeline connecting the first heat exchanger 2 and the first input end of the water distribution section 103. The input end of the first drainage pump 4 is connected to the outlet of the stripping tower 102 through a pipeline. The output end of the first drainage pump 4 is connected to a three-way connector through a pipeline. The remaining two ends of the three-way connector are connected to the input end of the first water storage tank 5 and the second input end of the water distribution section 103 through pipelines, respectively. The first circulation valve 6 is installed on the pipeline connecting the three-way connector and the second input end of the water distribution section 103. The first discharge valve 7 is installed on the pipeline connecting the three-way connector and the first water storage tank 5. The input end of the second drainage pump 8 is connected to the output end of the first water storage tank 5 through a pipeline. The output end of the second drainage pump 8 is connected to the hot fluid inlet of the first heat exchanger 2 through a pipeline.
[0029] The ammonia absorption unit includes an absorption tank 901, a gas distribution section 902, a first absorption fan 903, a drain pump 904, an evaporator 905, a second circulation valve 906, a second discharge valve 907, an evaporation heating section 908, a gas collection hood 909, and a second absorption fan 910. The absorption tank 901 contains 70% dilute sulfuric acid. The gas distribution section 902 is located inside the absorption tank 901 and is positioned near the bottom of the absorption tank 901. In a specific embodiment, the gas distribution section 902 is a gas distribution pipe, with the gas distribution pipe positioned on the side facing the top of the absorption tank 901. It has several vents; the input end of the first absorption blower 903 is connected to the air outlet of the stripping tower 102 through a pipeline, and the output end of the first absorption blower 903 is connected to the first input end of the gas distribution section 902 through a pipeline; the ammonia vapor generated by the stripping section is transported by the first absorption blower 903 to the absorption tank 901 containing 70% dilute sulfuric acid, so that the ammonia reacts with the dilute sulfuric acid to produce ammonium sulfate, thereby realizing the absorption of ammonia; the input end of the drain pump 904 is connected to the water outlet at the bottom of the absorption tank 901 through a pipeline, and the output end of the drain pump 904 is connected to a three-way valve through a pipeline. The head is connected, and one end of the three-way connector is connected to the upper part of the absorption tank 901 through a pipeline. The other end of the three-way connector extends into the evaporator 905 through a pipeline. The second circulation valve 906 is located on the pipeline between the three-way connector and the upper part of the absorption tank 901. The second discharge valve 907 is located on the pipeline connecting the three-way connector and the evaporator 905. An evaporation heating unit 908 is fixed on the outside of the evaporator 905. In this embodiment, the evaporation heating unit 908 is a water bath heating unit, which heats the evaporator 905 through the heat of the water bath. As a specific implementation method, water... The heating element is a jacket located outside the evaporator 905, which is heated by a water bath. The gas collection hood 909 is located above the evaporator 905. The input end of the second absorption fan 910 is connected to the upper part of the gas collection hood 909 through a pipeline, and the output end of the second absorption fan 910 is connected to the second input end of the gas distribution unit 902 through a pipeline. The evaporator 905 is configured to evaporate the ammonia gas in the ammonium sulfate solution as ammonia vapor through heating, and then transport it back to the absorption tank 901 for absorption by the second absorption fan 910, so as to achieve full absorption of ammonia gas.
[0030] The input end of the steam blower 10 is connected to the upper part of the water bath heating section through a pipeline, and the output end of the steam blower 10 is connected to the upper part of the steam heating section through a pipeline. The input end of the condensate pump 11 is connected to the bottom of the steam heating section through a pipeline, and the output end of the condensate pump 11 is connected to the water bath heating section. The steam generated by the water bath heating section is transported to the steam heating section through the steam blower 10 to make full use of the thermal energy of the steam. The condensate generated by the steam heating section is transported to the water bath heating section through the condensate pump 11 to make full use of water resources.
[0031] The chemical precipitation unit includes a precipitation reactor 1201, a first stirring unit 1202, a second pH meter, and a sludge discharge valve 1203. The upper part of the precipitation reactor 1201 is equipped with a water inlet, a precipitant inlet, and an acid inlet, while the bottom of the precipitation reactor 1201 is equipped with a sludge discharge port. The drive end of the first stirring unit 1202 is fixed outside the precipitation reactor 1201, while the stirring end of the first stirring unit 1202 is located inside the precipitation reactor 1201. The second pH meter is fixed to the precipitation reactor 1201. The detection end of the second pH meter is located inside the sedimentation reactor 1201 and extends below the liquid surface inside the sedimentation reactor 1201. The sludge discharge valve 1203 is located outside the sedimentation reactor 1201 and is connected to the sludge discharge port through a pipeline. The second pH meter is set up to detect the pH value of the wastewater in the sedimentation reactor 1201. In conjunction with the acid feed port of the sedimentation reactor 1201, it is beneficial for the staff to adjust the pH of the wastewater in the sedimentation reactor 1201, so as to improve the sedimentation effect and the degree of ammonia nitrogen removal.
[0032] The hot fluid inlet of the second heat exchanger 13 is connected to the hot fluid outlet of the first heat exchanger 2 through a pipeline, and the hot fluid outlet of the second heat exchanger 13 is connected to the water inlet of the precipitation reactor 1201; the input end of the third drainage pump 14 is connected to the interior of the precipitation reactor 1201 through a pipeline, and the pipeline connected to the input end of the third drainage pump 14 extends into the interior of the precipitation reactor 1201 and is located near the bottom of the precipitation reactor 1201; the output end of the third drainage pump 14 is connected to the wastewater inlet of the breakpoint chlorination unit through a pipeline.
[0033] The breakpoint chlorination unit includes an oxidation reactor 1501 and a second stirring unit 1502. The upper part of the oxidation reactor 1501 is provided with a water inlet and an oxidant feeding port, and the lower part of the oxidation reactor 1501 is provided with a water outlet. The water inlet of the oxidation reactor 1501 is the wastewater input end of the breakpoint chlorination unit. The driving end of the second stirring unit 1502 is fixed outside the oxidation reactor 1501, and the stirring end of the second stirring unit 1502 is located inside the oxidation reactor 1501. The sodium hypochlorite supply unit's sodium hypochlorite output end is connected to the oxidant feeding port through a pipeline. In this embodiment, the sodium hypochlorite supply unit generates sodium hypochlorite by electrolyzing NaCl solution. As an optional implementation, the sodium hypochlorite supply unit can be a high-concentration sodium hypochlorite production device (5-15%) from Yantai Jietong's electrolytic brine production device.
[0034] The input end of the fourth drainage pump 16 is connected to the outlet of the oxidation reactor 1501 through a pipeline, and the output end of the fourth drainage pump 16 is connected to the inlet of the upper part of the second water storage tank 17 through a pipeline. The input end of the fifth drainage pump 18 is connected to the outlet of the lower part of the second water storage tank 17, and the output end of the fifth drainage pump 18 is connected to a three-way connector. One end of the three-way connector is connected to the outside of the ammonia nitrogen wastewater treatment device through a pipeline, and the other end of the three-way connector is connected to the cold fluid inlet of the second heat exchanger 13. The cold fluid outlet of the second heat exchanger 13 is connected to the outside of the ammonia nitrogen wastewater treatment device through a pipeline. The discharge valve 19 is installed on the pipeline connecting the three-way connector to the outside of the ammonia nitrogen wastewater treatment device, and the heat exchange valve 20 is installed on the pipeline connecting the three-way connector to the second heat exchanger 13.
[0035] The first ammonia nitrogen monitor is fixed to the stripping unit, with its detection end located inside the stripping unit. The second ammonia nitrogen monitor is fixed to the sedimentation reactor 1201, with its detection end located inside the sedimentation reactor 1201. The third ammonia nitrogen monitor is fixed to the oxidation reactor 1501, with its detection end located inside the oxidation reactor 1501. These three ammonia nitrogen monitors are used to monitor the ammonia nitrogen concentration in the wastewater within the stripping unit, sedimentation reactor 1201, and oxidation reactor 1501, respectively. This allows staff to determine the degree of stripping, sedimentation, and oxidation of the wastewater based on the ammonia nitrogen concentration, thereby facilitating the selection of the appropriate degree of stripping, sedimentation, and oxidation to improve ammonia nitrogen removal efficiency and control the degree of ammonia nitrogen removal.
[0036] The usage process of the ammonia nitrogen wastewater treatment device according to an embodiment of this utility model is as follows:
[0037] A pre-set amount of high-concentration ammonia nitrogen wastewater (ammonia nitrogen concentration exceeding 5000 mg / L) is transported to the cold fluid inlet of the first heat exchanger 2 and enters the heating stripping unit for heating stripping treatment. During the stripping treatment, alkali is added through the alkali feed port to maintain the pH of the liquid inside the stripping tower 102 > 11. The temperature inside the stripping tower 102 is controlled at 70-90℃ through the steam heating section. The alkali dosage is reduced and the mass transfer process is accelerated by temperature control to form ammonia vapor. During the stripping treatment, the first feed valve 3 and the first discharge valve 7 are closed, the first circulation valve 6 is opened, and the first drain pump 4 is started to run, so that the liquid inside the stripping tower 102 circulates within the stripping tower 102 for the stripping treatment process. The first absorption air... The machine 903, the second absorption fan 910, and the discharge pump 904 operate, continuously opening the second circulation valve 906 and intermittently opening the second discharge valve 907, continuously feeding the ammonia vapor generated by the stripping tower 102 into the dilute sulfuric acid in the absorption tank 901. After absorption saturation, the ammonium sulfate solution in the absorption tank 901 is fed into the evaporator 905 for heating, and the next batch of dilute sulfuric acid is fed into the absorption tank 901. The second absorption fan 910 continuously feeds the ammonia vapor formed in the evaporator 905 into the absorption tank 901 to achieve full absorption of ammonia. After the next batch of dilute sulfuric acid is saturated, the concentrated ammonium sulfate in the evaporator 905 is discharged and cooled and crystallized for recovery. The obtained ammonium sulfate is used as fertilizer.
[0038] When the first ammonia nitrogen monitor detects an ammonia nitrogen concentration of 500–1000 mg / L, the first circulation valve 6 is closed and the first discharge valve 7 is opened, allowing the ammonia nitrogen wastewater in the stripping tower 102 to flow into the first storage tank 5. After the stripping tower 102 is emptied, high-concentration ammonia nitrogen wastewater is introduced back into the stripping tower 102. Simultaneously, the second drainage pump 8 is activated, causing the ammonia nitrogen wastewater in the first storage tank 5 and the newly added high-concentration ammonia nitrogen wastewater to simultaneously enter the first heat exchanger 2 for heat exchange. This allows the high-concentration ammonia nitrogen wastewater to be preheated by the first heat exchanger 2, while the newly added ammonia nitrogen... The wastewater is heated and stripped according to the aforementioned process. The ammonia nitrogen wastewater in the first storage tank 5 is then fed into the sedimentation reactor 1201 for sedimentation reaction treatment using the struvite method. Specifically, the first stirring unit 1202 is operated, and acid is first added through the acid feed port of the sedimentation reactor 1201 to adjust the pH of the ammonia nitrogen wastewater in the sedimentation reactor 1201 to 9. Then, phosphate and magnesium salts are added through the precipitant feed port. After the reaction is complete, PAC and PAM are added for precipitation until the ammonia nitrogen concentration detected by the second ammonia nitrogen monitor is 100-200 mg / L.
[0039] When the second ammonia nitrogen monitor detects an ammonia nitrogen concentration of 100-200 mg / L, the third drainage pump 14 is activated to pump the ammonia nitrogen wastewater in the sedimentation reactor 1201 into the oxidation reactor 1501. The second stirring unit 1502 is activated to add sodium hypochlorite from the sodium hypochlorite supply unit through the oxidant feed port. The oxidizing properties of sodium hypochlorite are used to fully remove the ammonia nitrogen from the wastewater.
[0040] When the third ammonia nitrogen monitor detects an ammonia nitrogen concentration of 0.5–2 mg / L, the fourth drainage pump 16 is activated to pump the ammonia nitrogen wastewater from the oxidation reactor 1501 into the second water storage tank 17 for natural cooling and standby. When the next batch of ammonia nitrogen wastewater enters the second heat exchanger 13, the discharge valve 19 is closed, the heat exchange valve 20 is opened, and the fifth drainage pump 18 is activated to allow the water discharged from the second water storage tank 17 to exchange heat with the ammonia nitrogen wastewater from the sedimentation reactor 1201 at the second heat exchanger 13.
[0041] An embodiment of this utility model provides an ammonia nitrogen wastewater treatment device that first performs stripping treatment through a heating stripping unit, then performs precipitation treatment through a chemical precipitation unit, and finally performs oxidation treatment through a breakpoint chlorination unit. This device can efficiently and fully treat ammonia nitrogen wastewater with a concentration exceeding 5000 mg / L, ultimately achieving an effluent ammonia nitrogen concentration of 0.5-2 mg / L.
[0042] An ammonia nitrogen wastewater treatment device according to an embodiment of this utility model uses a first heat exchanger 2 to exchange heat between the effluent from the stripping section and the initial ammonia nitrogen wastewater. The heat from the effluent from the stripping section heats the ammonia nitrogen wastewater, which helps to raise the temperature of the wastewater entering the stripping section to the preset temperature more quickly, improving treatment efficiency and reducing energy consumption for heating the ammonia nitrogen wastewater. Furthermore, a second heat exchanger 13 allows the effluent from the oxidation reactor 1501 to exchange heat polarity with the effluent from the hot fluid outlet of the first heat exchanger 2. The effluent from the oxidation reactor 1501 cools the ammonia nitrogen wastewater about to enter the sedimentation reactor 1201, which helps to lower the temperature of the wastewater entering the sedimentation reactor 1201 to a suitable temperature more quickly. To improve treatment efficiency, the first water storage tank 5 stores the effluent from the stripping section, allowing ammonia nitrogen wastewater to re-enter the stripping section after being emptied. This prevents the untreated ammonia nitrogen wastewater from mixing with the treated wastewater during the heat exchange process, thus improving ammonia nitrogen removal efficiency. The second water storage tank 17 stores the effluent from the oxidation reactor 1501. On one hand, the effluent from the oxidation reactor 1501 can be cooled in the second water storage tank 17, which helps improve its heat exchange effect in the second heat exchanger 13. On the other hand, the second water storage tank 17 acts as a buffer, ensuring that the water volume meets the heat exchange requirements of the second heat exchanger 13, which helps ensure the stability of the reaction efficiency.
[0043] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.
Claims
1. An ammonia nitrogen wastewater treatment device, characterized in that, The system includes a heated stripping unit, a chemical precipitation unit, and a breakpoint chlorination unit. The heated stripping unit comprises a stripping section and a stripping heating section. The stripping section strips the ammonia nitrogen wastewater. The stripping heating section is fixed to the stripping section and heats the stripping section. The chemical precipitation unit includes a precipitation reactor. The inlet of the precipitation reactor is connected to the wastewater outlet of the stripping section. The precipitation reactor is equipped with a precipitant inlet. The precipitation reactor is used to chemically precipitate the ammonia nitrogen wastewater from the stripping section. The breakpoint chlorination unit includes an oxidation reactor. The inlet of the oxidation reactor is connected to the wastewater outlet of the precipitation reactor via a pipeline. The oxidation reactor is equipped with an oxidant inlet. The oxidation reactor is used to oxidize the ammonia nitrogen wastewater from the precipitation reactor.
2. The ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The heating stripping unit also includes a first pH meter and a thermometer. The first pH meter and the thermometer are both fixed to the stripping section. The detection ends of the first pH meter and the thermometer are both located inside the stripping section. The detection end of the first pH meter is located near the bottom of the stripping section. The stripping section is also provided with an alkali feeding port.
3. The ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The chemical precipitation unit also includes a second pH meter, which is fixed to the precipitation reaction vessel. The detection end of the second pH meter is located inside the precipitation reaction vessel, and the precipitation reaction vessel is also provided with an acid feed port.
4. The ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, It also includes a first ammonia nitrogen monitor, a second ammonia nitrogen monitor, and a third ammonia nitrogen monitor. The first ammonia nitrogen monitor is fixed to the stripping section, and the detection end of the first ammonia nitrogen monitor is located inside the stripping section. The second ammonia nitrogen monitor is fixed to the precipitation reaction vessel, and the detection end of the second ammonia nitrogen monitor is located inside the precipitation reaction vessel. The third ammonia nitrogen monitor is fixed to the oxidation reaction vessel, and the detection end of the third ammonia nitrogen monitor is located inside the oxidation reaction vessel.
5. The ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, It also includes an ammonia absorption unit, which includes an absorption tank and a first absorption fan. The input end of the first absorption fan is connected to the air outlet of the stripping section through a pipeline, and the pipeline connected to the output end of the first absorption fan extends into the interior of the absorption tank and is located near the bottom of the absorption tank.
6. The ammonia nitrogen wastewater treatment device according to claim 5, characterized in that, The ammonia absorption unit also includes an evaporator, an evaporation heating section, and a second absorption fan. The outlet of the absorption tank is connected to the interior of the evaporator via a pipeline. The evaporation heating section is fixed to the evaporator and heats the evaporator. The input end of the second absorption fan is connected to the interior of the evaporator via a pipeline, and the pipeline connected to the output end of the second absorption fan extends into the interior of the absorption tank and is located near the bottom of the absorption tank.
7. The ammonia nitrogen wastewater treatment device according to claim 6, characterized in that, It also includes a steam blower and a condensate pump. The stripping heating section is a steam heating section, and the evaporation heating section is a water bath heating section. The input end of the steam blower is connected to the upper part of the water bath heating section through a pipeline, and the output end of the steam blower is connected to the upper part of the steam heating section through a pipeline. The input end of the condensate pump is connected to the bottom of the steam heating section through a pipeline, and the output end of the condensate pump is connected to the water bath heating section.
8. The ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, It also includes a first heat exchanger and a second heat exchanger. The hot fluid inlet of the first heat exchanger is connected to the wastewater outlet of the stripping section. The hot fluid outlet of the first heat exchanger is connected to the hot fluid inlet of the second heat exchanger through a pipeline. The cold fluid inlet of the first heat exchanger is used to input the ammonia nitrogen wastewater. The cold fluid outlet of the first heat exchanger is connected to the wastewater inlet of the stripping section through a pipeline. The hot fluid outlet of the second heat exchanger is connected to the water inlet of the precipitation reactor through a pipeline. The cold fluid inlet of the second heat exchanger is connected to the output of the oxidation reactor.
9. The ammonia nitrogen wastewater treatment device according to claim 8, characterized in that, It also includes a first water storage tank and a second water storage tank. The input end of the first water storage tank is connected to the output end of the stripping unit through a pipeline. The output end of the first water storage tank is connected to the hot fluid inlet of the first heat exchanger through a pipeline. The input end of the second water storage tank is connected to the output end of the oxidation reactor through a pipeline. The output end of the second water storage tank is connected to the cold fluid inlet of the second heat exchanger through a pipeline.
10. The ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The sodium hypochlorite supply unit has its output end connected to the interior of the oxidation reactor via a pipeline.