Deep arsenic removal device

Abstract

The utility model provides a deep arsenic removal device, which relates to the technical field of arsenic removal of desulfurization waste water, and comprises an arsenic removal reaction unit, a precipitation unit, a water storage tank unit and a filter pressing unit, the arsenic removal reaction unit comprises a pH regulating tank, an iron gathering tank communicated with the pH regulating tank through a pipeline, and a flocculation tank communicated with the iron gathering tank through a pipeline, the flocculation tank is positioned between the pH adjusting tank and the iron gathering tank; the precipitation unit comprises a precipitation tank, and the flocculation tank is communicated with the precipitation tank; the water storage tank unit comprises a middle water tank and a collecting water tank, and the settling tank, the middle water tank and the collecting water tank are arranged side by side and are communicated in sequence. The device can effectively remove arsenic in the desulfurization wastewater, does not generate secondary pollution in the whole treatment process, is environment-friendly, and meets the environmental protection requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to desulfurization wastewater arsenic removal technical field, especially in-depth arsenic removal device. BACKGROUND

[0002] In the industrial field, especially in the thermal power generation, metallurgy and other industries, the treatment of desulfurization wastewater is the key link of environmental protection, among them, arsenic as common toxic and harmful substances in desulfurization wastewater, its treatment effectiveness is directly related to the safety and compliance of wastewater discharge.

[0003] The existing arsenic removal device usually includes reaction tank, agitator and sedimentation separation unit, the reaction tank is used for adding the predetermined proportion of precipitant and desulfurization wastewater to carry out the mixed reaction, the agitator is used for stirring the mixed liquid to ensure that the precipitant and arsenic in wastewater contact fully, and the sedimentation separation unit adopts the natural sedimentation or mechanical filtration to separate arsenic-containing precipitate to achieve the purpose of arsenic removal.

[0004] However, in the actual operation process, the removal efficiency of the above-mentioned device to arsenic is very limited, simple stirring and mixing are difficult to make the precipitant and various forms of arsenic in wastewater react uniformly and efficiently, especially when treating complex composition desulfurization wastewater, local incomplete reaction is prone to occur, in addition, when separating arsenic-containing precipitate, the sedimentation separation unit is prone to residual sedimentation, which seriously affects the effluent quality, and the subsequent treatment of the sediment sludge is complex, improper disposal will cause a large amount of secondary pollution, greatly increase the environmental protection pressure and treatment cost. Therefore, a new type of in-depth arsenic removal device is urgently needed. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims at providing an in-depth arsenic removal device, which aims at solving the technical problems that the existing arsenic removal device has very limited removal efficiency to arsenic, seriously affects the effluent quality, and improper disposal will cause a large amount of secondary pollution, greatly increase the environmental protection pressure and treatment cost.

[0006] The utility model discloses a kind of in-depth arsenic removal devices, including arsenic removal reaction unit, sedimentation unit, water pool unit and filter-pressing unit, the arsenic removal reaction unit includes pH adjusting tank, polyferric tank communicated with the pH adjusting tank by pipeline, and flocculation tank communicated with the polyferric tank by pipeline, the flocculation tank is between the pH adjusting tank and the polyferric tank;

[0007] The sedimentation unit includes sedimentation tank, and the flocculation tank is communicated with the sedimentation tank.

[0008] The water pool unit includes intermediate water pool and collection water pool, and the sedimentation tank, the intermediate water pool and the collection water pool are arranged side by side and communicated sequentially.

[0009] Compared with the prior art, the deep arsenic removal device has the advantages that: the structure is simple, the treatment effect is effectively improved while the treatment cost is reduced, good economic benefits are obtained, arsenic in desulfurization wastewater can be effectively removed in actual use, the whole treatment process does not produce secondary pollution, is friendly to the environment, meets environmental protection requirements, has good adaptability to wastewater of different sources and components, can maintain stable treatment effect under different process conditions, and has strong adaptability.

[0010] In addition, the deep arsenic removal device has the following additional technical features.

[0011] Further, the filter pressing unit comprises a sludge discharge pump and a filter pressing device, the bottom of the sediment tank, the intermediate pool and the collection pool is respectively communicated with the inlet end of the sludge discharge pump through a pipeline, the outlet end of the sludge discharge pump is communicated with the inlet end of the filter pressing device through a pipeline, and the outlet end of the filter pressing device is communicated with the top of the intermediate pool through a pipeline.

[0012] Further, the filter pressing device is a plate-and-frame filter press.

[0013] Further, the deep arsenic removal device further comprises a stirrer, and the inner part of the pH adjusting tank, the polyferric tank and the flocculation tank is respectively provided with the stirrer.

[0014] Further, a pH meter and an electromagnetic flowmeter are arranged in the pH adjusting tank, and the pH meter and the electromagnetic flowmeter are respectively electrically connected with an external controller through wires.

[0015] Further, the pH adjusting tank, the polyferric tank and the flocculation tank are respectively provided with a polyferric dosing point, and the polyferric dosing point is used for dosing by a dosing device.

[0016] Further, the deep arsenic removal device further comprises an evaporation unit, and the evaporation unit comprises an evaporation water inlet pump and an evaporation pool, the inlet end of the evaporation water inlet pump is communicated with the collection pool through a pipeline, and the outlet end of the evaporation water inlet pump is communicated with the evaporation pool through a pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the deep arsenic removal device.

[0018] Among them, the above drawings include the following reference signs: 1-pH adjusting tank; 2-polyferric tank; 3-flocculation tank; 4-reaction stirrer; 5-sediment tank; 6-intermediate pool; 7-collection pool; 8-filter pressing device; 9-sludge discharge pump; 10-evaporation water inlet pump.

[0019] The following detailed description will further explain the present application with reference to the above mentioned drawings. DETAILED DESCRIPTION

[0020] For the purpose of facilitating the understanding of the present application, a more comprehensive description of the present application will be given below with reference to the relevant drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be a mediating element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be a mediating element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Please refer to Figure 1 , which shows a deep arsenic removal device, comprising an arsenic removal reaction unit, a sedimentation unit, a water storage pool unit and a filter pressing unit. Specifically, the arsenic removal reaction unit comprises a pH adjusting tank 1, a poly ferric tank 2 communicating with the pH adjusting tank 1 through a pipeline, and a flocculation tank 3 communicating with the poly ferric tank 2 through a pipeline, and the flocculation tank 3 is located between the pH adjusting tank 1 and the poly ferric tank 2. The sedimentation unit comprises a sedimentation tank 5, and the flocculation tank 3 communicates with the sedimentation tank 5. The water storage pool unit comprises an intermediate water pool 6 and a collection water pool 7, and the sedimentation tank 5, the intermediate water pool 6 and the collection water pool 7 are arranged side by side and communicate in sequence.

[0024] Further, the filter pressing unit comprises a sludge discharge pump 9 and a filter pressing equipment 8, and the bottoms of the sedimentation tank 5, the intermediate water pool 6 and the collection water pool 7 respectively communicate with the inlet end of the sludge discharge pump 9 through a pipeline, the outlet end of the sludge discharge pump 9 communicates with the inlet end of the filter pressing equipment 8 through a pipeline, and the outlet end of the filter pressing equipment 8 communicates with the top of the intermediate water pool 6 through a pipeline. As a specific example, in the present embodiment, the filter pressing equipment 8 is a plate-and-frame filter press.

[0025] The deep arsenic removal device of the application further comprises a stirrer 4, and the inside of the pH adjusting tank 1, the polyferric tank 2 and the flocculation tank 3 is respectively provided with the stirrer 4. The pH adjusting tank 1 is provided with a pH meter and an electromagnetic flowmeter, and the pH meter and the electromagnetic flowmeter are respectively electrically connected with an external controller through wires. Further, the pH adjusting tank 1, the polyferric tank 2 and the flocculation tank 3 are respectively provided with a polyferric dosing point, and the polyferric dosing point is used for dosing by a dosing device.

[0026] The deep arsenic removal device of the application further comprises an evaporation unit, and the evaporation unit comprises an evaporation water inlet pump 10 and an evaporation water pool, and the inlet end of the evaporation water inlet pump 10 is communicated with the collection water pool 7 through a pipeline, and the outlet end of the evaporation water inlet pump 10 is communicated with the evaporation water pool through a pipeline.

[0027] In actual use, the use principle of the deep arsenic removal device of the application can be that before deep arsenic removal is performed by using the deep arsenic removal device of the application, the rotary kiln high-arsenic desulfurization wastewater needs to be pretreated to reduce the arsenic concentration, that is to say, the front end of the arsenic removal reaction unit in the application is connected with the rotary kiln pretreated wastewater through a pipeline, and the front end of the arsenic removal reaction unit is connected with the sedimentation unit through a pipeline.

[0028] The use principle of the application is further described below in combination with specific embodiments, but the application is not limited to the following embodiments.

[0029] Embodiment one

[0030] In this embodiment, the rotary kiln high-arsenic desulfurization wastewater with an initial arsenic concentration of 1776.0 mg / L is pumped into the rotary kiln high-arsenic desulfurization wastewater collection water pool, and then pumped into the arsenic removal reaction unit through the rotary kiln desulfurization wastewater lifting pump, the reaction temperature is room temperature, the lime milk is added by the dosing device to adjust the reaction pH to 6-7, then the polyferric sulfate is added by the dosing device to preliminarily remove arsenic, after 3-4 hours of reaction, the pressure filtration is performed by the pressure filtration equipment to the rotary kiln desulfurization wastewater comprehensive adjusting water pool, and the arsenic concentration is detected to be 34.90 mg / L, and the arsenic removal rate compared with the initial arsenic concentration is 98.04%.

[0031] Subsequently, the rotary kiln pretreated low-arsenic desulfurization wastewater is punched into the pH adjusting tank 1 of the deep arsenic removal device through a pipeline, lime milk is added through a dosing device to adjust the pH of the reaction to 6-8, and polymeric ferric sulfate is added through a dosing device to further react and remove arsenic, and then the low-arsenic desulfurization wastewater after the pH adjustment and the preliminary arsenic removal is punched into the polymeric ferric tank 2 through a pipeline, and polymeric ferric sulfate is continuously added through a dosing device to fully react, and then the low-arsenic desulfurization wastewater after the secondary reaction is punched into the flocculation tank 3 through a pipeline, and polymeric ferric sulfate, polyacrylamide (PAM) flocculant and polyaluminum chloride (PAC) flocculant are added through a dosing device into the flocculation tank 3 to fully react and settle, and the sludge settled at the bottom of the sediment tank 5 is transported to the filter pressing equipment 8 through a sludge pump 9 for filter pressing, and the filtrate obtained by filter pressing is transported to the intermediate water pool 6 through a pipeline, and the sludge obtained by filter pressing is transported to a warehouse for treatment.

[0032] The supernatant of the wastewater after the settlement treatment in the sediment tank 5 flows to the intermediate water pool 6 in a horizontal flow, and the arsenic concentration of the wastewater in the intermediate water pool 6 is detected, and the arsenic concentration is 4.47 mg / L, and the arsenic removal rate compared with the initial arsenic concentration is 99.75%. Finally, the wastewater in the intermediate water pool 6 flows into the collection water pool 7 through a pipeline, and is pumped into the evaporation water pool through an evaporation inlet pump 10 for subsequent treatment. It should be noted that the volume of the rotary kiln high-arsenic desulfurization wastewater treated in this embodiment is 15m 3 , the volume of the rotary kiln low-arsenic desulfurization wastewater treated is 41m 3 , the consumption of lime milk is 1000 kg, the consumption of polymeric ferric sulfate is 2000 kg, the consumption of PAM is 250 kg, and the consumption of PAC is 175 kg.

[0033] Example Two

[0034] The use process of the deep arsenic removal device provided in the second embodiment of the utility model is different from the use process of the deep arsenic removal device in the first embodiment, and the initial arsenic concentration of the rotary kiln high-arsenic desulfurization wastewater punched into the rotary kiln high-arsenic desulfurization wastewater collection water pool 7 is 1462.0 mg / L, the arsenic concentration of the low-arsenic desulfurization wastewater after the pretreatment is detected to be 42.41 mg / L, and the arsenic removal rate compared with the initial arsenic concentration is 97.10%.

[0035] The arsenic concentration of the wastewater obtained after the low-arsenic desulfurization wastewater is deeply removed by the deep arsenic removal device is 5.45 mg / L, and the arsenic removal rate compared with the initial arsenic concentration is 99.63%. The volume of the rotary kiln high-arsenic desulfurization wastewater treated in this embodiment is 10m 3 , the volume of the rotary kiln low-arsenic desulfurization wastewater treated is 60m 3 , the consumption of lime milk is 1000 kg, the consumption of polymeric ferric sulfate is 2000 kg, the consumption of PAM is 250 kg, and the consumption of PAC is 175 kg.

[0036] Embodiment three

[0037] The use process of the deep arsenic removal device provided by the third embodiment of the utility model is different from the use process of the deep arsenic removal device in the first embodiment in that: the initial arsenic concentration of the rotary kiln high-arsenic desulfurization wastewater punched into the rotary kiln high-arsenic desulfurization wastewater collection pool 7 is 2734.0 mg / L, the arsenic concentration of the low-arsenic desulfurization wastewater after pretreatment is detected as 73.46 mg / L, and the arsenic removal rate compared with the initial arsenic concentration is 97.31%.

[0038] The arsenic concentration of the wastewater obtained after the low-arsenic desulfurization wastewater is deeply removed by the deep arsenic removal device of the utility model is detected as 4.15 mg / L, and the arsenic removal rate compared with the initial arsenic concentration is 99.85%. The volume of the rotary kiln high-arsenic desulfurization wastewater treated in the embodiment is 20 m 3 , the volume of the rotary kiln low-arsenic desulfurization wastewater treated is 36 m 3 , the lime milk consumption is 1000 kg, the polymeric ferric sulfate consumption is 1175 kg, the PAM consumption is 250 kg, and the PAC consumption is 325 kg.

[0039] Please refer to the following Table 1, which shows the parameter table corresponding to the first embodiment to the third embodiment of the utility model

[0040] Table 1: Rotary kiln high-arsenic desulfurization wastewater treatment data table in the first embodiment to the third embodiment of the utility model

[0041]

[0042] It can be known from the parameter comparison in the first embodiment to the third embodiment in Table 1 that the deep arsenic removal device of the utility model has a high arsenic removal efficiency for desulfurization wastewater, which can effectively guarantee the water quality of effluent.

[0043] In conclusion, the deep arsenic removal device of the utility model has the beneficial effects that: the structure is simple, the treatment cost is reduced while the treatment effect is effectively improved, good economic benefits are achieved, in the actual use process, arsenic in desulfurization wastewater can be effectively removed, the whole treatment process does not produce secondary pollution, is friendly to the environment, meets the environmental protection requirements, has good adaptability to wastewater of different sources and components, can maintain stable treatment effect under different process conditions, and has strong adaptability.

[0044] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model application scope. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model application should be subject to the appended claims.

Claims

1. A device for deep arsenic removal, characterized in that, The deep arsenic removal device comprises an arsenic removal reaction unit, a precipitation unit, a water storage pool unit and a filter pressing unit. The precipitation unit comprises a precipitation tank. The water storage pool unit comprises an intermediate water pool and a collection water pool.

2. The deep arsenic removal device of claim 1, wherein, The filter pressing unit comprises a sludge discharge pump and a filter pressing device.

3. The deep arsenic removal device of claim 2, wherein, The deep arsenic removal device further comprises a mixer.

4. The deep arsenic removal device of claim 1, wherein, The pH adjusting tank is provided with a pH meter and an electromagnetic flowmeter.

5. The deep arsenic removal device of claim 1, wherein, The pH adjusting tank, the polyferric tank and the flocculation tank are respectively provided with polyferric dosing points.

6. The deep arsenic removal device of claim 1, wherein, The deep arsenic removal device further comprises an evaporation unit.

7. The deep arsenic removal device of claim 1, wherein, The evaporation unit comprises an evaporation water inlet pump and an evaporation water pool.

Images