Treatment device for in-situ recovery of aluminum and iron in chemical sludge

Abstract

The utility model relates to the technical field of sludge treatment equipment, in particular to a treatment device for in-situ recovery of aluminum and iron in chemical sludge, which comprises an acidification tank, an impurity removal tank, a phosphorus removal tank, a separation tank and a buffer tank which are connected in sequence, the system further comprises an unpowered mixing system, and the unpowered mixing system can discharge liquid in the acidification pool, the impurity removal pool, the phosphorus removal pool and the separation pool without power equipment. The treatment device is simple in integration, small in occupied area, low in energy consumption and capable of discharging liquid without power equipment, and the water pollution treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge treatment equipment, in particular to a treatment device for in-situ recovery of aluminum and iron in chemical sludge. Background Art

[0002] The composition of sewage is complex, containing a large amount of mud, sand, organic matter, phosphorus and other substances. After biochemical reactions, the total phosphorus effluent index is difficult to meet the existing effluent index requirements. Therefore, a large amount of flocculants are required for chemical phosphorus removal and removal of suspended matter SS (suspended substance) in sewage. The consumption of a large amount of flocculants not only causes a waste of resources, but also produces a large amount of high-water content sludge that needs to be disposed of, which brings huge economic pressure to the operation of sewage treatment plants.

[0003] In the existing sewage treatment process, the coagulation process (mixing, coagulation, flocculation) is an important link in sewage treatment, which determines the operating conditions of the subsequent sewage treatment process, the final effluent quality and the total treatment cost. However, the existing technology for the recovery of aluminum and iron will increase the amount of total phosphorus during the recovery process, which will cause the total phosphorus index to be unqualified. In addition, the existing technology cannot recycle and utilize aluminum and iron on site, which will result in a high economic operating cost for the sewage treatment plant.

[0004] Therefore, how to provide a treatment device for in-situ recovery of aluminum and iron in chemical sludge with a small footprint and low energy consumption is a technical problem that needs to be solved urgently. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides a processing device for in-situ recovery of aluminum and iron in chemical sludge.

[0006] The utility model provides a processing device for in-situ recovery of aluminum and iron in chemical sludge, comprising:

[0007] An acidification tank, an impurity removal tank, a phosphorus removal tank, a separation tank and a buffer tank, wherein the acidification tank, the impurity removal tank, the phosphorus removal tank, the separation tank and the buffer tank are connected in sequence;

[0008] It also includes an unpowered mixing system, which can discharge the liquid in the acidification tank, the impurity removal tank, the phosphorus removal tank, and the separation tank without the need for power equipment.

[0009] Preferably, the unpowered mixing system comprises a first mud outlet, a second mud outlet, a third mud outlet and an overflow weir;

[0010] The first mud outlet is arranged on the side wall between the acidification tank and the impurity removal tank, and the distance between the first mud outlet and the tank bottom is H1;

[0011] The second mud outlet is arranged on the side wall between the impurity removal tank and the phosphorus removal tank, and the distance between the second mud outlet and the tank bottom is H2;

[0012] The third mud outlet is arranged on the side wall between the dephosphorization tank and the separation tank, and the distance between the third mud outlet and the tank bottom is H3;

[0013] The overflow weir is arranged on the side wall between the separation tank and the buffer tank, and the distance between the overflow weir and the tank bottom is H4;

[0014] Among them, H1>H2>H3>H4.

[0015] Preferably, it further comprises a water pump, which is arranged outside the buffer pool and is connected to the buffer pool through a pipeline.

[0016] Preferably, it further comprises: a first pH meter and an acidic dosing tank, wherein the first pH meter is arranged inside the acidification tank, and the acidic dosing tank is arranged above the acidification tank, and acidic drugs can be added into the acidification tank through the acidic dosing tank;

[0017] A second pH meter and an alkaline dosing tank, wherein the second pH meter is arranged in the dephosphorization tank, and the alkaline dosing tank is arranged above the dephosphorization tank, and alkaline drugs can be added into the dephosphorization tank through the alkaline dosing tank.

[0018] Preferably, it further comprises a remote intelligent control system, the remote intelligent control system comprises a pH acquisition module and a control module, the first pH meter and the second pH meter are provided with sensors, and the pH acquisition module can monitor the pH values ​​of the first pH meter and the second pH meter through the sensors;

[0019] The control module can control the switches of the acidic dosing tank and the alkaline dosing tank according to the pH value collected by the pH collection module.

[0020] Preferably, it also includes: a heavy metal capture agent dosing tank, the heavy metal capture agent dosing tank is arranged above the impurity removal tank, and the metal capture agent can be added into the impurity removal tank through the heavy metal capture agent dosing tank;

[0021] A ferric chloride dosing tank is provided above the dephosphorization tank in parallel with the alkaline dosing tank, and the ferric chloride dosing tank can be used to add ferric chloride dephosphorization agent into the dephosphorization tank.

[0022] Preferably, it further comprises a first stirring mechanism, a second stirring mechanism and a third stirring mechanism;

[0023] The first stirring mechanism is arranged in the acidification tank, the second stirring mechanism is arranged in the impurity removal tank, and the third stirring mechanism is arranged in the phosphorus removal tank.

[0024] Preferably, the lower portion of the separation tank is funnel-shaped.

[0025] Preferably, it also includes an aluminum and iron salt recovery system, which is connected to the buffer pool through a pipeline.

[0026] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0027] The utility model provides a treatment device for in-situ recovery of aluminum and iron in chemical sludge. The device is simple and integrated, occupies little space, utilizes liquid level difference to achieve liquid mixing, consumes little energy, and reduces the cost of water pollution treatment.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 The utility model is a schematic diagram of the structure of a treatment device for in-situ recovery of aluminum and iron in chemical sludge.

[0031] Figure 2 The utility model discloses a design principle diagram of a treatment device for in-situ recovery of aluminum and iron in chemical sludge.

[0032] Reference numerals:

[0033] 1. Acidification tank; 11. First mud outlet; 12. First pH meter; 13. Acidic dosing tank; 14. First stirring mechanism; 2. Decontamination tank; 21. Second mud outlet; 22. Second stirring mechanism; 23. Heavy metal capture agent dosing tank; 3. Phosphorus removal tank; 31. Third mud outlet; 32. Second pH meter; 33. Alkaline dosing tank; 34. Ferric chloride dosing tank; 35. Third stirring mechanism; 4. Separation tank; 41. Overflow weir; 5. Buffer tank; 6. Tank bottom; 7. Water pump; 8. Aluminum and iron salt recovery system. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all 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. The following embodiments are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0035] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0037] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] Combine the following Figure 1-2 The utility model describes a processing device for in-situ recovery of aluminum and iron in chemical sludge.

[0040] The design principle of the treatment device for in-situ recovery of aluminum and iron in chemical sludge provided by the utility model is as follows:

[0041] The residual sludge from the secondary sedimentation tank of the sewage treatment plant and the chemical sludge from the high-efficiency sedimentation tank are treated and disposed separately. The residual sludge is modified with the acidic solid matter after the sludge from the high-efficiency sedimentation tank is treated, so that the flocs of the residual sludge are destroyed and the bound water therein is released, which is convenient for the subsequent sludge dehydration treatment and resource utilization. The chemical sludge from the high-efficiency sedimentation tank is acid-dissolved to extract aluminum and iron, which are reused as flocculants in the high-efficiency sedimentation tank to replace part or all of the flocculants for recycling.

[0042] The chemical sludge produced in the high-efficiency sedimentation tank of the sewage treatment plant first enters the in-situ recovery device of aluminum and iron in the chemical sludge provided by the utility model to recover aluminum and iron. The recovered aluminum and iron solutions are directly returned to the high-efficiency sedimentation tank to replace part of the flocculant or all of it. The obtained solid is used to modify the sludge produced in the secondary sedimentation tank. The dewatering performance of the modified sludge is improved, and the mud cake is incinerated or co-incinerated.

[0043] The utility model provides a treatment device for in-situ recovery of aluminum and iron in chemical sludge, comprising: an acidification tank 1, a decontamination tank 2, a dephosphorization tank 3, a separation tank 4 and a buffer tank 5, wherein the acidification tank 1, the decontamination tank 2, the dephosphorization tank 3, the separation tank 4 and the buffer tank 5 are connected in sequence;

[0044] It also includes an unpowered mixing system, which can discharge the liquid in the acidification tank 1, the impurity removal tank 2, the phosphorus removal tank 3, and the separation tank 4 without the need for power equipment.

[0045] Specifically, the unpowered mixing system includes a first mud outlet 11, a second mud outlet 21, a third mud outlet 31 and an overflow weir 41;

[0046] The first mud outlet 11 is arranged on the side wall between the acidification tank 1 and the impurity removal tank 2, and the distance between the first mud outlet 11 and the tank bottom 6 is H1;

[0047] The second mud outlet 21 is arranged on the side wall between the impurity removal tank 2 and the phosphorus removal tank 3, and the distance between the second mud outlet 21 and the tank bottom 6 is H2;

[0048] The third mud outlet 31 is arranged on the side wall between the dephosphorization tank 3 and the separation tank 4, and the distance between the third mud outlet 31 and the tank bottom 6 is H3;

[0049] The overflow weir 41 is disposed on the side wall between the separation tank 4 and the buffer tank 5, and the distance between the overflow weir 41 and the tank bottom 6 is H4;

[0050] Among them, H1>H2>H3>H4.

[0051] It also includes a water pump 7, which is arranged outside the buffer tank 5, and the buffer tank 5 is connected to the water pump 7 through a pipeline. The treatment device for in-situ recovery of aluminum and iron in chemical sludge provided by the utility model includes four reaction zones, namely, an acidification tank 1, a de-impurity tank 2, a dephosphorization tank 3 and a separation tank 4. The sludge liquid in the four reaction zones can enter the de-impurity tank 2 from the acidification tank 1, the dephosphorization tank 3 from the dephosphorization tank 2, and the dephosphorization tank 4 from the dephosphorization tank 3 due to the liquid level difference, without the need for power equipment. The liquid in the separation tank 4 enters the buffer tank 5 through the overflow weir 41. The buffer tank 5 is externally connected to the water pump 7, and the aluminum and iron salt solutions therein are pumped out by the external water pump 7 to ensure that the liquid in the separation tank 4 can flow out and enter the buffer tank 5.

[0052] The acidic dosing tank 13 is arranged above the acidification tank 1, and an acidic solution is added into the acidification tank 1 through the acidic dosing tank 13. The acidic dosing tank 1 also includes a first stirring mechanism 14, which is arranged in the acidification tank 1. The sludge liquid in the acidification tank 1 is stirred by the first stirring mechanism 14. The first pH meter 12 is arranged in the acidification tank 1, and the first pH meter 12 monitors the pH value in the acidification tank 1. When the pH in the acidification tank 1 is in the range of 1.0 to 2.0, the addition of the acidic solution is stopped. When the pH is higher than 2.0, the acidic dosing tank 13 is opened to add the acidic solution into the acidification tank 1. The acidic solution can be any one or both of sulfuric acid and hydrochloric acid, but is not limited thereto. The pH value in the acidification tank 1 is adjusted to be in the range of 1.0 to 2.0, and the residence time of the chemical sludge in the acidification tank 1 is between 30 minutes and 60 minutes. It also includes a second stirring mechanism 22, which is arranged in the second impurity removal tank 2. When the acidified sludge liquid enters the impurity removal tank 2 through the first mud outlet 11, the second stirring mechanism 22 stirs the impurity removal tank 2. After stirring, the liquid in the impurity removal tank 2 is uniform, which is conducive to sufficient reaction. It also includes a heavy metal capture agent dosing tank 23, which is arranged above the impurity removal tank 2. The heavy metal capture agent is added to the impurity removal tank 2 through the heavy metal capture agent dosing tank 23. The sludge liquid stays in the impurity removal tank 2 for 20 to 40 minutes. Then the sludge enters the phosphorus removal tank 3 through the second mud outlet 21, and is arranged in the phosphorus removal tank 3. The second pH meter 32 monitors the pH value in the dephosphorization tank 3. The pH in the dephosphorization tank 3 is controlled in the range of 2.2 to 2.5. When the pH is lower than 2.2, an alkaline solution is added to the dephosphorization tank 3 through the alkaline dosing tank 33 arranged above the dephosphorization tank 3. The alkaline solution can be one or more of calcium hydroxide, sodium hydroxide, and calcium oxide, but is not limited to these alkaline solutions. The third stirring mechanism 35 is also included. The third stirring mechanism 35 is arranged in the dephosphorization tank 3. The sludge liquid in the dephosphorization tank 3 is stirred by the third stirring mechanism 35 to make the liquid in the dephosphorization tank 3 uniform, which is conducive to the full reaction. The residence time of the sludge in the dephosphorization tank 3 is 10 to 30 minutes.The system further comprises a ferric chloride dosing tank 34, wherein the ferric chloride dosing tank 34 and the alkaline dosing tank 33 are arranged in parallel and at intervals above the dephosphorization tank 3. Ferric chloride can be added into the dephosphorization tank 3 as a flocculant through the ferric chloride dosing tank 34. After the sewage liquid passes through the dephosphorization tank 3, it enters the separation tank 4 through the third mud outlet 31. The sludge stays in the separation tank 4 for 120 to 180 minutes for gravity settling. The sludge liquid entering the lower part of the separation tank 4 is discharged from the bottom of the separation tank 4 through the mud discharge pipe. The aluminum iron salt solution in the separation tank 4 enters the buffer tank 5 through the overflow weir 41. The system further comprises an aluminum iron salt recovery system 8, wherein the aluminum iron salt recovery system 8 is connected with the buffer tank 5 through a pipeline. The aluminum iron salt solution staying in the buffer tank 5 is pumped out by the water pump 7 through a pipeline to the aluminum iron salt recovery system 8.

[0053] It also includes a remote intelligent control system, which includes a pH acquisition module and a control module. Sensors are set on the first pH meter 12 and the second pH meter 32. The pH acquisition module can monitor the pH values ​​of the first pH meter 12 and the second pH meter 32 through the sensors; the control module can control the switches of the acidic dosing tank 13 and the alkaline dosing tank 33 according to the pH values ​​collected by the pH acquisition module.

[0054] The pH acquisition module and the control module adopt the existing common design method, which will not be repeated here.

[0055] The reaction conditions of the aluminum-iron recovery device are controlled and adjusted by an automatic control system without manual adjustment. The obtained aluminum-iron solution has an aluminum ion concentration of 100-2000 mg / L and an iron ion concentration of 100-1500 mg / L. It can be recycled as an inorganic aluminum-iron flocculant to reduce the dosage of flocculants in high-efficiency sedimentation tanks.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A treatment device for in-situ recovery of aluminum and iron in chemical sludge, characterized in that: include: An acidification tank, an impurity removal tank, a phosphorus removal tank, a separation tank and a buffer tank, wherein the acidification tank, the impurity removal tank, the phosphorus removal tank, the separation tank and the buffer tank are connected in sequence; It also includes an unpowered mixing system, which can discharge the liquid in the acidification tank, the impurity removal tank, the phosphorus removal tank, and the separation tank without the need for power equipment.

2. The device for in-situ recovery of aluminum and iron in chemical sludge according to claim 1, characterized in that: The unpowered mixing system comprises a first mud outlet, a second mud outlet, a third mud outlet and an overflow weir; The first mud outlet is arranged on the side wall between the acidification tank and the impurity removal tank, and the distance between the first mud outlet and the tank bottom is H1; The second mud outlet is arranged on the side wall between the impurity removal tank and the phosphorus removal tank, and the distance between the second mud outlet and the tank bottom is H2; The third mud outlet is arranged on the side wall between the dephosphorization tank and the separation tank, and the distance between the third mud outlet and the tank bottom is H3; The overflow weir is arranged on the side wall between the separation tank and the buffer tank, and the distance between the overflow weir and the tank bottom is H4; Among them, H1>H2>H3>H4.

3. The device for in-situ recovery of aluminum and iron in chemical sludge according to claim 1 or 2, characterized in that: It also includes a water pump, which is arranged outside the buffer pool and is connected to the buffer pool through a pipeline.

4. The device for in-situ recovery of aluminum and iron in chemical sludge according to claim 1, characterized in that: Also includes: A first pH meter and an acidic dosing tank, wherein the first pH meter is disposed inside the acidification tank, and the acidic dosing tank is disposed above the acidification tank; A second pH meter and an alkaline dosing tank, wherein the second pH meter is arranged in the dephosphorization tank, and the alkaline dosing tank is arranged above the dephosphorization tank.

5. The device for in-situ recovery of aluminum and iron in chemical sludge according to claim 4, characterized in that: It also includes a remote intelligent control system, which includes a pH acquisition module and a control module. Sensors are provided on the first pH meter and the second pH meter, and the pH acquisition module can monitor the pH values ​​of the first pH meter and the second pH meter through the sensors; The control module can control the switches of the acidic dosing tank and the alkaline dosing tank according to the pH value collected by the pH collection module.

6. The device for in-situ recovery of aluminum and iron in chemical sludge according to claim 4, characterized in that: Also includes: A heavy metal capture agent dosing tank, wherein the heavy metal capture agent dosing tank is arranged above the impurity removal tank; A ferric chloride dosing tank is provided above the dephosphorization tank in parallel and at intervals with the alkaline dosing tank.

7. The device for in-situ recovery of aluminum and iron in chemical sludge according to claim 1, characterized in that: Also includes a first stirring mechanism, a second stirring mechanism and a third stirring mechanism; The first stirring mechanism is arranged in the acidification tank, the second stirring mechanism is arranged in the impurity removal tank, and the third stirring mechanism is arranged in the phosphorus removal tank.

8. The device for in-situ recovery of aluminum and iron in chemical sludge according to claim 1, characterized in that: The lower part of the separation tank is funnel-shaped.

9. The device for in-situ recovery of aluminum and iron in chemical sludge according to claim 1, characterized in that: It also includes an aluminum and iron salt recovery system, which is connected to the buffer pool through a pipeline.

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