A multi-media environment collaborative treatment and recycling system for desulfurization wastewater

Abstract

The utility model relates to the technical field of desulfurization wastewater recycling device, and specifically to a multi-media environment collaborative treatment desulfurization wastewater recycling system, including an aeration regulating tank, a first reactor, a second reactor, a filtering unit, and a concentration and separation unit; the concentration and separation unit is provided with a concentrated water outlet; the filtering unit is provided with a backwash wastewater outlet, and the backwash wastewater outlet of the filtering unit is connected to the first reactor inlet pipe; the concentrated water outlet of the concentration and separation unit is connected to the aeration regulating tank outlet. The utility model has a simple structure and high efficiency in impurity removal. The generated byproduct concentrated water and backwash wastewater can be refluxed for impurity removal, low carbon emission reduction, recycling, and reduced reagent and operating costs.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization wastewater recycling devices, and in particular to a multi-media environment collaborative treatment desulfurization wastewater recycling system. Background Art

[0002] Desulfurization wastewater should be centrally treated, and the treated desulfurization wastewater should be repeatedly recycled. The recycling of desulfurization wastewater is a major challenge faced by all wet desulfurization companies. In the process of wet desulfurization (such as limestone-gypsum method), in order to improve the SO2 absorption efficiency, a certain amount of ammonia water or liquid ammonia is usually added as an alkaline absorbent, which significantly increases the ammonia nitrogen concentration in the desulfurization wastewater. The ammonia nitrogen in the discharged desulfurization wastewater exceeds the standard, which affects the recycling of desulfurization wastewater resources and brings equipment corrosion hazards. CN215924556U is a device that uses nanofiltration membrane to treat desulfurization wastewater, but the design is complex and cannot achieve the recycling of wastewater. The above defects have not been solved for a long time. Utility Model Content

[0003] In view of the problems raised by the background technology, the utility model designs a multi-media environment collaborative treatment and recycling system for desulfurization wastewater.

[0004] The utility model is realized by the following technical solutions:

[0005] A multi-media environment collaborative treatment and recycling system for desulfurization wastewater, comprising an aeration regulating tank, a first reactor, a second reactor, a filtration unit, and a concentration and separation unit connected in sequence; the aeration regulating tank is provided with an aeration regulating tank inlet, an aeration device, an aeration regulating tank outlet, and an ammonia removal agent feeding port; the first reactor is provided with a first reactor inlet pipe, a first reactor stirring device, a guide tube, and a dosing point;

[0006] Furthermore, the second reactor is provided with a second reactor stirring device.

[0007] Furthermore, the outlet of the aeration regulating tank is connected to the inlet pipe of the first reactor.

[0008] Furthermore, a sludge discharge device and a sludge return device are provided at the bottom of the second reactor, and the sludge return device is connected to the inlet pipe of the first reactor.

[0009] Furthermore, the overflow outlet of the second reactor is connected to the water inlet of the filter unit, and the backwash wastewater outlet of the filter unit is connected to the inlet pipe of the first reactor.

[0010] Furthermore, the concentrated water outlet of the concentration and separation unit is connected to the outlet of the aeration regulating tank.

[0011] The advantages of the utility model are:

[0012] The utility model has a simple structure and adopts a chemical method to add a high-efficiency ammonia remover at the ammonia remover feeding port, thereby reducing the ammonia nitrogen content of the wastewater and reducing the impact on the subsequent recycling device; the concentrated water is recycled to remove impurities, and the produced water is further concentrated and evaporated and crystallized as a product for sale, with efficient impurity removal. The generated by-product concentrated liquid is returned to the sedimentation tank for impurity removal, low-carbon emission reduction, recycling, and reduction of reagents and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0014] Figure 1 It is a schematic diagram of the structure of the utility model; wherein, 1-aeration regulating tank, 101-aeration regulating tank inlet, 102-aeration device, 103-aeration regulating tank outlet, 104-ammonia removal agent feeding port; 2-first reactor, 201-first reactor inlet pipe, 202-first reactor stirring device, 203-guide tube, 204-dosing point; 3-second reactor, 301-second reactor stirring device; 4-filtration unit, 401-backwash wastewater outlet; 5-concentration and separation unit, 501-concentrated water outlet; 6-sludge discharge device; 7-sludge reflux device; Figure 2 It is a process flow chart of the multi-media environment collaborative treatment of desulfurization wastewater recycling system. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] The utility model is further described below in conjunction with the accompanying drawings. Example 1

[0017] like Figure 1As shown, a multi-media environment collaborative treatment and recycling system for desulfurization wastewater comprises an aeration regulating tank 1, a first reactor 2, a second reactor 3, a filtration unit 4, and a concentration and separation unit 5 connected in sequence; the aeration regulating tank 1 is provided with an aeration regulating tank inlet 101, an aeration device 102, an aeration regulating tank outlet 103, and an ammonia removal agent feeding port 104; the first reactor 2 is provided with a first reactor inlet pipe 201, a first reactor stirring device 202, a guide tube 203, and a dosing point 204; wherein the second reactor 3 is provided with a second reactor stirring device 301. wherein the aeration regulating tank outlet 103 is connected to the first reactor inlet pipe 201. wherein the second reactor 3 is provided with a sludge discharge device 6 and a sludge return device 7 at the bottom, and the sludge return device 7 is connected to the first reactor inlet pipe 201. wherein the overflow outlet of the second reactor 3 is connected to the water inlet of the filtration unit 4. wherein the backwash wastewater outlet 401 of the filtration unit is connected to the first reactor inlet pipe 201. The concentrated water outlet 501 of the concentration and separation unit 5 is connected to the outlet 103 of the aeration regulating tank.

[0018] Use multi-media environment to coordinate the treatment of desulfurization wastewater recycling process Figure 2 As shown,

[0019] 1. System cleaning:

[0020] (1) Ammonia nitrogen removal

[0021] In wet desulfurization, such as the limestone-gypsum process, a certain amount of ammonia water or liquid ammonia is usually added as an alkaline absorbent to improve the SO2 absorption efficiency, which significantly increases the ammonia nitrogen concentration in the desulfurization wastewater. The ammonia nitrogen in the discharged desulfurization wastewater exceeds the standard, affecting the recycling of desulfurization wastewater resources and causing equipment corrosion hazards.

[0022] Removal principle: A chemical method is used to add a high-efficiency ammonia removal agent to the ammonia removal agent feeding port 104 to optimize the best reaction temperature and reaction time, reduce the ammonia nitrogen content of the wastewater, and reduce the impact on subsequent recycling devices.

[0023] (2) Multi-stage efficient precipitation and impurity removal

[0024] Mechanism: By recycling the concentrated solution, liquid alkali and sodium carbonate, the calcium ions in the desulfurization wastewater are precipitated into calcium sulfate and the magnesium ions are precipitated into magnesium hydroxide. Calcium sulfate is slightly soluble, so there are still residual calcium ions and magnesium ions in the water, which are removed by adding sodium carbonate in the secondary sedimentation tank.

[0025] Function: Multiple independent reactors, dosage and reaction conditions obtained through experiments, ensure efficient removal of hardness and heavy metals.

[0026] First reactor 2: The concentrated liquid is refluxed, the reaction time is 30 minutes, and the dosing point 204 uses calcium sulfate and other forms to remove most of the hardness.

[0027] First reactor 2 Reactor process: The water from the first reactor inlet pipe 201 first enters the guide tube 203, and the side wall of the guide tube 203 is provided with a dosing point 204 to ensure that the water and the drug are fully mixed, and the produced water overflows through the upper opening;

[0028] The second reactor 3: by adding liquid alkali (adjusting the pH to 11-12), sodium carbonate, and adding according to the calcium hardness of the effluent from reactor 1, CO3 2- :Ca 2+ The mass ratio is 1.5-2, PAC (50 mg / L), which is used for coagulation + removal of residual fluoride ions, with a reaction time of 30 minutes, to achieve deep removal of hardness, heavy metals and fluorides.

[0029] The sludge in the second reactor 3 settles and enters the sludge discharge device 6 , and part of it flows back through the sludge return device 7 through the inlet pipe 201 of the first reactor.

[0030] Co-processing and recycling

[0031] (1) The overflow outlet of the second reactor 3 is connected to the water inlet of the filter unit 4. After the filtration of the filter unit 4, such as sand filtration and ultrafiltration, the water continues to enter the concentration and separation unit 5 for further concentration and separation. The backwash wastewater outlet 401 of the filter unit is connected to the inlet pipe 201 of the first reactor. The concentrated water outlet 501 of the concentration and separation unit 5 is connected to the outlet 103 of the aeration regulating tank, so as to realize the recycling of backwash wastewater and concentrated water.

[0032] Mechanism: The effluent from multi-stage sedimentation enters the concentration and separation unit after sand filtration and ultrafiltration. The concentrated water is recycled to remove impurities, and the produced water is further concentrated, evaporated and crystallized for sale as a resource.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multi-media environment collaborative treatment and recycling system for desulfurization wastewater, characterized in that: The invention comprises an aeration regulating tank (1), a first reactor (2), a second reactor (3), a filtering unit (4), and a concentration and separation unit (5) which are connected in sequence; the aeration regulating tank (1) is provided with an aeration regulating tank inlet (101), an aeration device (102), an aeration regulating tank outlet (103), and an ammonia removal agent feeding port (104); the first reactor (2) is provided with a first reactor inlet pipe (201), a first reactor stirring device (202), a guide tube (203), and a dosing point (204); the concentration and separation unit (5) is provided with a concentrated water outlet (501); and the filtering unit (4) is provided with a backwash wastewater outlet (401).

2. According to claim 1, a multi-media environment collaborative treatment and recycling system for desulfurization wastewater, characterized in that: The second reactor (3) is provided with a second reactor stirring device (301).

3. According to claim 1, a multi-media environment collaborative treatment and recycling system for desulfurization wastewater, characterized in that: The aeration regulating tank outlet (103) is connected to the first reactor inlet pipe (201).

4. According to claim 1, a multi-media environment collaborative treatment and recycling system for desulfurization wastewater, characterized in that: A sludge discharge device (6) and a sludge return device (7) are provided at the bottom of the second reactor (3); the sludge return device (7) is connected to the inlet pipe (201) of the first reactor.

5. According to claim 1, a multi-media environment collaborative treatment and recycling system for desulfurization wastewater, characterized in that: The overflow outlet of the second reactor (3) is connected to the water inlet of the filter unit (4), and the backwash wastewater outlet (401) of the filter unit (4) is connected to the inlet pipe (201) of the first reactor.

6. According to claim 1, a multi-media environment collaborative treatment and recycling system for desulfurization wastewater, characterized in that: The concentrated water outlet (501) of the concentration and separation unit (5) is connected to the aeration regulating tank outlet (103).

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