CN211111548U - Desulfurization wastewater treatment equipment - Google Patents
Desulfurization wastewater treatment equipment Download PDFInfo
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- CN211111548U CN211111548U CN201921526545.0U CN201921526545U CN211111548U CN 211111548 U CN211111548 U CN 211111548U CN 201921526545 U CN201921526545 U CN 201921526545U CN 211111548 U CN211111548 U CN 211111548U
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Abstract
The embodiment of the utility model relates to the field of wastewater treatment, and discloses a treatment facility for desulfurization wastewater. The utility model discloses in, desulfurization waste water's treatment facility, include: a first reaction tank for accommodating the pretreated wastewater and the alkali; the second reaction box is close to the first reaction box and is used for containing the suspension and the flocculating agent overflowing from the first reaction box; the clarification tank is communicated with the second reaction tank; the bottom of the clarification tank is communicated with a sewage discharge pipeline which is used for containing coagulant aids; the sealed mercury removal box is communicated with the clarification tank and an external gas source; an external gas source is used for ventilating the sealed mercury removal box to form bubbles and bring out zero-valent mercury; a water outlet is also arranged on the sealed mercury removing box; the magnetic separation device is used for separating out residual metal reducing agent; and the oxidation absorption device is communicated with the closed demercuration box. Compared with the prior art, the method has the advantages that under the condition that organic sulfur is not consumed by the desulfurization wastewater, mercury in the desulfurization wastewater is removed, and the enrichment and concentration of mercury resources are realized.
Description
Technical Field
The embodiment of the utility model relates to the field of wastewater treatment, in particular to desulfurization wastewater's treatment facility.
Background
Heavy metal mercury in wastewater is concerned due to characteristics of high toxicity, easy migration, biological accumulation and the like, and the discharge limit of mercury ions is clearly specified (0.005 mg/L) in Shanghai Integrated wastewater discharge Standard (DB31/199 and 2018).
At present, most of power plants adopt a method of adding organic sulfur into desulfurization wastewater to precipitate mercury, then the price of the organic sulfur is higher, and other metal ions in the wastewater can also react with the organic sulfur, which undoubtedly increases the consumption of the organic sulfur, and further increases the operating cost.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a treatment facility of desulfurization waste water for desulfurization waste water lets the mercury desorption in the desulfurization waste water under the condition that does not consume organic sulphur, still realizes that the enrichment of mercury resource is concentrated.
In order to solve the above technical problem, an embodiment of the present invention provides a desulfurization wastewater treatment apparatus, including:
the first reaction box is used for accommodating pretreated wastewater and alkali and is also used for reacting the pretreated wastewater with the alkali, adjusting the pH value of the pretreated wastewater to a preset value, and removing part of metal ions to obtain a suspension containing precipitates;
a second reaction chamber proximate to the first reaction chamber for containing the suspension and flocculant overflowing from the first reaction chamber;
the clarification tank is communicated with the second reaction tank and is used for containing the suspension flowing out of the second reaction tank; the bottom of the clarification tank is communicated with a sewage discharge pipeline, and the sewage discharge pipeline is used for containing a coagulant aid and discharging the sediment;
the sealed mercury removal tank is communicated with the clarification tank and an external gas source and is used for accommodating a metal reducing agent and a clarified aqueous solution flowing out of the clarification tank, and the metal reducing agent reduces mercury ions in the clarified aqueous solution into zero-valent mercury; the external gas source is used for ventilating the sealed mercury removal box to form bubbles to carry out zero-valent mercury; a water outlet is also formed in the sealed mercury removal box;
the magnetic separation device is used for separating the residual metal reducing agent;
and the oxidation absorption device is communicated with the closed demercuration box and is used for absorbing the bubbles and the zero-valent mercury and oxidizing the zero-valent mercury into divalent mercury ions.
The utility model discloses embodiment is for prior art, owing to be equipped with first reaction box, second reaction box, depositing reservoir, magnetic separation device, airtight demercuration case and oxidation absorbing device, the formation precipitate takes place with alkali in first reaction box to the preliminary treatment waste water, and the thing that forms slightly soluble with partial heavy metal ion is appeared. And the second reaction box is close to the first reaction box, the suspension containing the precipitate overflows into the second reaction box, and the precipitate is agglomerated together through a flocculating agent. And other pretreated wastewater can be continuously introduced into the first reaction tank for reaction treatment. The clarification tank is communicated with the second reaction box, the suspension is introduced into the clarification tank, the weight of the precipitate which is agglomerated together in the suspension is increased, the precipitate can sink after standing, the bottom of the clarification tank is communicated with a sewage discharge pipeline, and the precipitate enters the sewage discharge pipeline after sinking. And as the coagulant aid is contained in the sewage discharge pipeline, the coagulant aid further promotes the precipitates to be agglomerated together, dehydrates the precipitates and discharges the precipitates. The suspension is layered, the upper layer is clear aqueous solution, the lower layer is sediment, the sediment of the lower layer is discharged from a sewage discharge pipeline, and the clear aqueous solution of the upper layer overflows to a sealed demercuration tank communicated with a clarification tank, so that part of heavy metal ions are separated out to obtain clear aqueous solution. The closed mercury removal box is communicated with the clarification tank, the clarified aqueous solution is introduced into the closed mercury removal box to react with the metal reducing agent to generate water-insoluble zero-valent mercury, an external gas source introduces gas into the closed mercury removal box to form bubbles to carry out zero-valent mercury, and the bubbles are introduced into the oxidation absorption device to oxidize the zero-valent mercury into bivalent mercury to be collected. The magnetic separation device is used for attracting the metal reducing agent, so that the metal reducing agent is adsorbed on the magnetic separation device, the sealed mercury removal box is also provided with a water outlet, and the purified water is discharged from the sealed mercury removal box. And further, under the condition of not consuming organic sulfur, mercury in the desulfurization wastewater is removed, and the cost is reduced.
In addition, the clarifier includes: the holding area is communicated with the second reaction box, the guide area is communicated with the bottom of the holding area, and one end of the guide area, which is far away from the holding area, is communicated with the sewage discharge pipeline.
In addition, the side wall of the guide area is an inclined surface, and the inclined surface is gathered towards one side far away from the accommodating area.
In addition, each of the sealed mercury removal boxes comprises:
the accommodating box body is communicated with the clarification tank and the external gas source and is also communicated with the oxidation absorption device; the accommodating box body is provided with the water outlet;
and the stirring device is at least partially arranged in the accommodating box body.
In addition, a strong oxide absorbent is contained in the oxidation absorption device.
In addition, the second reaction tank includes:
the flocculation tank body is close to the first reaction tank and is used for containing the suspension and the flocculating agent overflowing from the first reaction tank;
the buffer tank body is close to the flocculation tank body and the clarification tank and is used for containing substances overflowing from the flocculation tank body.
In addition, the flocculation box body, the buffer box body and the first reaction box body have the same capacity.
In addition, the desulfurization waste water treatment apparatus further includes: and the protection device is communicated with the oxidation absorption device.
In addition, the protection device contains activated carbon.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic view showing the construction of an apparatus for treating desulfurization waste water according to a first embodiment of the present invention;
FIG. 2 is a flow chart showing a method for treating desulfurization waste water in accordance with a first embodiment of the present invention;
FIG. 3 is a schematic structural view of an apparatus for treating desulfurization waste water in accordance with a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The first embodiment of the present invention relates to a method for treating desulfurization waste water, as shown in fig. 1 and 2, arrow a in fig. 1 is the flow direction of solution, and arrow B is the flow direction of sludge discharge, comprising the following steps:
Step 5, introducing gas into a solution containing zero-valent mercury to form bubbles to carry out the zero-valent mercury, and oxidizing the zero-valent mercury carried out by the bubbles; meanwhile, the residual metal reducing agent in the solution is separated by a magnetic separation device, and the dischargeable purified water is obtained. The sealed mercury removal box 4 is communicated with an external gas source 8, gas is introduced into the sealed mercury removal box 4 to form bubbles which bring out zero-valent mercury, the bubbles bring the zero-valent mercury into the oxidation absorption device, a strong oxide absorbent such as potassium permanganate is arranged in the oxidation absorption device, the zero-valent mercury is formed into bivalent mercury, and mercury resources are enriched together. The metal reducing agent is attracted by the magnetic separation device 5, and the metal reducing agent is adsorbed on the magnetic separation device 5. In actual use, the solution can be still placed by a gravity separation method, and the metal reducing agent is precipitated and discharged. The containing box 41 is provided with a water outlet 10, and when the liquid in the containing box 41 is discharged outwards, the purified water in the containing box 41 is discharged because the metal reducing agent and the mercury are collected.
It can be easily found from the above that the pH value of the pretreated wastewater is adjusted by adding alkali into the pretreated wastewater, and the alkali and the heavy metal ions are reversed to generate hydroxide, so as to form a precipitate, and obtain a suspension containing the precipitate. And adding a flocculating agent into the suspension containing the precipitate to flocculate the precipitate, wherein after standing for a preset time, part of the precipitate is aggregated together, and the weight of the aggregated precipitate in the standing state is increased to precipitate. And adding a coagulant aid into the precipitate, wherein the coagulant aid further promotes the precipitate to be agglomerated together, dehydrating the precipitate, allowing the precipitate and clear water in the suspension to separate into layers, forming a clear water solution on the upper layer, and discharging to obtain the clear water solution, so as to realize separation of part of heavy metal ions in the wastewater. And finally, adding a metal reducing agent into the clarified water, wherein the metal reducing agent reduces mercury ions into zero-valent mercury, and because the zero-valent mercury is insoluble in water, introducing gas into the slurry to form bubbles to wrap the zero-valent mercury and float out from the slurry, and oxidizing the floated zero-valent mercury to form divalent mercury ions so as to realize enrichment and concentration of mercury resources. And then the metal reducing agent in the slurry is removed by a magnetic separation device to obtain purified water to be discharged. And further, under the condition of not consuming organic sulfur, mercury in the desulfurization wastewater is removed, and the cost is reduced.
Further, the alkali in the step 1 is sodium hydroxide, and the pH value is 7-12. The base is also calcium hydroxide, or both calcium hydroxide and sodium hydroxide.
Optionally, the flocculating agent is selected from one or more of PAM, polyferric and polyaluminium, and the concentration is 0.2-2 g/L.
Optionally, the coagulant aid is selected from one or more of PAM, polyferric and polyaluminium, and the concentration is 0.2-2 g/L.
In addition, the residual metallic reducing agent in step 4 is separated by magnetic attraction. That is, the magnetic separation device 5 may be an electromagnet, and after the reaction is completed, the electromagnet is directly electrified to attract the residual metal reducing agent. The magnetic separation device 5 can also be a magnet, and is attached to the sealed mercury removal tank 4 after the reaction is finished to adsorb the metal reducing agent.
In addition, the metal reducing agent is selected from one or more of iron powder and zinc powder. The reducing agent is cheap and easy to obtain, and the operation cost is low.
The second embodiment of the present invention relates to a desulfurization wastewater treatment apparatus, as shown in fig. 3, arrow a in fig. 3 is the flow direction of the solution, and arrow B is the flow direction of the sludge discharge, including: the device comprises a first reaction box 1, a second reaction box 2, a clarification tank 3, a magnetic separation device 5, a sealed mercury removal box 4 and an oxidation absorption device 6. The first reaction box 1 is used for accommodating pretreated wastewater and alkali, and is also used for reacting the pretreated wastewater with the alkali, adjusting the pH value of the pretreated wastewater to a preset value, and removing part of heavy metal ions to obtain a suspension containing precipitates. The second reaction box 2 is close to the first reaction box 1, and the suspension in the first reaction box 1 overflows into the second reaction box 2, so that the retention time is ensured, the pretreated wastewater is fully mixed with alkali, and the added wastewater is prevented from directly flowing into the second reaction box 2. The second reaction tank 2 is used to contain the suspension containing the sediment and the flocculant overflowing from the first reaction tank 1. The clarifier 3 is communicated with the second reaction box 2 and is used for containing the suspension flowing out of the second reaction box 2. The bottom of the clarification tank is communicated with a sewage pipeline which is used for containing coagulant aids and discharging sediments. The sealed mercury removal box 4 is communicated with the clarification tank 3 and an external air source 8 and is used for containing a clarified water solution and a metal reducing agent, and the metal reducing agent reduces mercury ions in the clarified water into zero-valent mercury. And an external gas source 8 is used for ventilating the sealed mercury removal box to form bubbles to carry out zero-valent mercury. And the magnetic separation device 5 is used to separate out the residual metal reducing agent. In actual use, the solution can be still placed by a gravity separation method, and the metal reducing agent is precipitated and discharged. The oxidation absorption device 6 is communicated with the closed mercury removal box 4 and is used for absorbing bubbles and zero-valent mercury and oxidizing the zero-valent mercury into divalent mercury ions. And the sealed mercury removal tank 4 is also provided with a water outlet 10, the metal reducing agent in the sealed mercury removal tank 4 is absorbed, and after zero-valent mercury is discharged, purified water is discharged from the water outlet 10.
Specifically, as shown in fig. 3, the wastewater to be treated is introduced into the first reaction chamber 1, the content of metal ions such as calcium, magnesium, manganese and the like in the pretreated wastewater is far higher than that of mercury, alkali is added into the first reaction chamber 1, and the reaction is carried out for 0.5 to 2 hours, so that the metal ions such as calcium, magnesium, manganese and the like produce heavy metal hydroxide precipitates. The suspension containing the precipitate overflows into the second reaction tank 2, and a flocculant is added into the second reaction tank 2, so that the precipitate is flocculated and aggregated together. In the reaction in the second reaction tank 2, new wastewater to be treated may be introduced into the first reaction tank 1, thereby continuously treating the wastewater in batches. And (3) introducing the suspension liquid in the second reaction box 2 into the clarification tank 3, wherein the weight of the precipitate which is agglomerated together in the suspension liquid is increased, the precipitate can sink and settle after standing, the bottom of the clarification tank 3 is communicated with a sewage discharge pipeline 20, and the precipitate enters the sewage discharge pipeline 20 after sinking. The coagulant aid is placed in the sewerage pipe 20, which further promotes the aggregation of the precipitate together and dewaters the precipitate allowing it to drain. Namely, the suspension forms a layer, the upper layer is clear aqueous solution, the lower layer is sediment, the sediment of the lower layer is discharged from the sewage discharge pipeline 20, and the clear aqueous solution of the upper layer overflows to the sealed mercury removal tank 4 communicated with the clarification tank 3, so that the separation of heavy metal ions is realized. And then, introducing the clarified aqueous solution into a sealed mercury removal tank 4, adding a metal reducing agent into the sealed mercury removal tank 4, stirring the sealed mercury removal tank 4, and fully reacting the clarified aqueous solution with the metal reducing agent to reduce mercury ions into zero-valent mercury. The external air source 8 can be a pump which leads air into the sealed mercury removal box 4 through a pipeline to form bubbles to bring out zero-valent mercury. The sealed mercury removal box 4 is communicated with the oxidation absorption device 6 through a pipeline, zero-valent mercury carried by bubbles enters the oxidation absorption device 6 along the pipeline, the zero-valent mercury is reduced into divalent mercury by the strong oxide absorbent of the oxidation absorption device 6 and is enriched together, and gas formed by reaction is discharged from the strong oxide absorbent 6. The metal reducing agent is attracted by the magnetic separation device 5, so that the metal reducing agent is adsorbed on the magnetic separation device 5. The sealed mercury removal box 4 is further provided with a water outlet 10, a valve can be arranged at the water outlet 10, and after the work in the sealed mercury removal box 4 is finished, the valve is opened to discharge purified water from the water outlet 10, so that water resources can be recycled.
As can be easily found from the above, the first reaction box 1, the second reaction box 2, the clarification tank 3, the magnetic separation device 5, the sealed mercury removal box 4 and the oxidation absorption device 6 are arranged, so that the pretreated wastewater reacts with alkali in the first reaction box to generate precipitates, and part of heavy metal ions form insoluble matters to be separated out. In the second reaction chamber 2, which is adjacent to the first reaction chamber 1, the suspension containing the sediment overflows into the second reaction chamber, and the sediment is agglomerated by means of a flocculant. And other pretreated wastewater can be continuously introduced into the first reaction box 1 for reaction treatment. The clarification tank 3 is communicated with the second reaction box 2, the suspension is introduced into the clarification tank 3, the weight of the precipitate which is agglomerated together in the suspension is increased, the precipitate can sink and settle after standing, the bottom of the clarification tank 3 is communicated with a sewage discharge pipeline 20, and the precipitate enters the sewage discharge pipeline 20 after sinking. And as the coagulant aid is contained in the sewage discharge pipeline, the coagulant aid further promotes the precipitates to be agglomerated together, dehydrates the precipitates and discharges the precipitates. Namely, the suspension is layered, the upper layer is clear aqueous solution, the lower layer is sediment, the sediment of the lower layer is discharged from the sewage discharge pipeline 20, and the clear aqueous solution of the upper layer overflows to the sealed mercury removal box 4 communicated with the clarification tank, so that part of heavy metal ions are separated out to obtain clear aqueous solution. And introducing the clarified aqueous solution into the sealed mercury removal tank 4, reacting with a metal reducing agent to generate water-insoluble zero-valent mercury, introducing gas into the sealed mercury removal tank 4 by an external gas source 8 to form bubbles and carry out zero-valent mercury, introducing the bubbles into the oxidation absorption device 6, and oxidizing the zero-valent mercury into divalent mercury to be collected. The metal reducing agent is attracted by the magnetic separation device 5 and adsorbed on the magnetic separation device 5, the sealed mercury removal tank 4 is also provided with a water outlet 10, and the purified water is discharged from the sealed mercury removal tank. And further, under the condition of not consuming organic sulfur, mercury in the desulfurization wastewater is removed, and the cost is reduced.
Further, as shown in fig. 3, the clarifier 3 includes: an accommodating area 21 communicated with the second reaction box 2, a guide area 22 communicated with the bottom of the accommodating area 21, and one end of the guide area 22 far away from the accommodating area 21 is communicated with the sewage discharge pipe 20. Therefore, the precipitate is discharged firstly, and the risk of precipitation leaching is prevented from being formed when zero-valent mercury is discharged in the subsequent process.
Specifically, as shown in fig. 3, the side wall of the guiding area 22 is a slope, and the slope converges toward the side away from the accommodating area 21. The sediment slides down the side walls to the guide section 22 and out into the sewerage pipe 20. And a pump may be provided to pump sludge in the sewer line 20.
As shown in fig. 3, each sealed mercury removal tank 4 includes: a housing case 41 and a stirring device 42. The containing box body 41 is communicated with the clarification tank 3 and is also communicated with an oxidation absorption device. The stirring device 42 is at least partially disposed in the housing case 41, and the housing case 41 is provided with a drain opening 10. The stirring device 42 comprises a motor and a stirring rod, and the motor drives the stirring rod to rotate and stir. After the metal reducing agent is added into the containing box 41, the stirring device 42 stirs in the containing box 41 to ensure that the metal reducing agent and the clarified aqueous solution are fully reflected, and mercury ions are reduced into zero-valent mercury. A valve may be provided at the drain opening 10 of the housing 41 to open when the purified water is required to be drained and collected.
Further, a strong oxide absorbent is contained in the oxidation absorption device 6, and the strong oxide absorbent can be potassium permanganate and the like. The oxidation absorption device is a box body which is provided with an air vent and contains a strong oxide absorbent, the potassium permanganate is arranged in the box body, the top of the closed mercury removal box is communicated with the top of the box body through a pipeline, zero-valent mercury brought out by bubbling enters the strong oxide along the pipeline, the zero-valent mercury and the strong oxide react to generate divalent mercury, the divalent mercury is discharged from the air vent of the box body, and mercury resources are enriched in the box body.
In addition, as shown in fig. 3, the second reaction tank 2 includes: a flocculation tank 21 and a buffer tank 22, wherein the flocculation tank 21 is adjacent to the first reaction tank 1 and is used for accommodating the suspension containing the sediments and the flocculant overflowing from the first reaction tank and also used for reacting the suspension containing the sediments and the flocculant. The buffer tank 22 is adjacent to the flocculation tank 21 and the clarification tank 3 and is used for containing substances overflowed from the flocculation tank 21. The suspension containing the precipitate overflows into the flocculation tank 21, a flocculating agent is added into the flocculation tank 21, the time of the suspension containing the precipitate in the flocculation tank 21 is 0.5-2 hours, and then the suspension is introduced into the buffer tank 22, so that the flocculation time is prolonged, more precipitates are agglomerated together, and more heavy metal ions are separated. Thereby guarantee dwell time through the form of overflow, make deposit and flocculating agent intensive mixing, avoid adding waste water direct inflow next box. And the time duration in the buffer box body 22 is also 0.5-2 hours, after the substances in the flocculation box body 21 overflow into the buffer box body 22, the suspension in the first reaction box 1 can be introduced into the flocculation box body 21 for continuous treatment, and the efficiency is improved.
Further, as shown in FIG. 3, the flocculation tank 21, the buffer tank 22, and the first reaction tank 1 have the same capacity. Therefore, the liquid enters the flocculation tank 21 from the first reaction tank 1, and can completely enter each tank after entering the buffer tank 22, and the tanks are not too large to occupy redundant space.
More particularly, the desulfurization wastewater treatment facility further comprises: and the protection device 7 is communicated with the oxidation absorption device 6. The protection device 7 is communicated with the oxidation absorption device 6 through a pipeline, gas exhausted from the oxidation absorption device 6 enters the protection device 7 through the pipeline, the protection device 7 can absorb impurities such as residual zero-valent mercury in the gas exhausted from the oxidation absorption device 6, and then other impurities are exhausted into the air, so that the finally exhausted gas is purer.
In addition, activated carbon, which is conventional or halogen-modified activated carbon, is contained in the protection device 7. The protection device includes: the shell is provided with vent holes, part of the vent holes are communicated with the oxidation absorption device 6 through a pipeline, and the other part of the vent holes is communicated with the outside for exhausting.
Since the second embodiment corresponds to the present embodiment, the present embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still valid in this embodiment, and the technical effects that can be achieved in the second embodiment can also be achieved in this embodiment, and are not described herein again in order to reduce the repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the second embodiment.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (9)
1. A desulfurization wastewater treatment apparatus, comprising:
the first reaction box is used for accommodating pretreated wastewater and alkali and is also used for reacting the pretreated wastewater with the alkali, adjusting the pH value of the pretreated wastewater to a preset value, and removing part of metal ions to obtain a suspension containing precipitates;
a second reaction chamber proximate to the first reaction chamber for containing the suspension and flocculant overflowing from the first reaction chamber;
the clarification tank is communicated with the second reaction tank and is used for containing the suspension flowing out of the second reaction tank; the bottom of the clarification tank is communicated with a sewage discharge pipeline, and the sewage discharge pipeline is used for containing a coagulant aid and discharging the sediment;
the sealed mercury removal tank is communicated with the clarification tank and an external gas source and is used for accommodating a metal reducing agent and a clarified aqueous solution flowing out of the clarification tank, and the metal reducing agent reduces mercury ions in the clarified aqueous solution into zero-valent mercury; the external gas source is used for ventilating the sealed mercury removal box to form bubbles to carry out zero-valent mercury; a water outlet is also formed in the sealed mercury removal box;
the magnetic separation device is used for separating the residual metal reducing agent;
and the oxidation absorption device is communicated with the closed demercuration box and is used for absorbing the bubbles and the zero-valent mercury and oxidizing the zero-valent mercury into divalent mercury ions.
2. The apparatus for treating desulfurization wastewater according to claim 1, characterized in that said clarifier comprises: the holding area is communicated with the second reaction box, the guide area is communicated with the bottom of the holding area, and one end of the guide area, which is far away from the holding area, is communicated with the sewage discharge pipeline.
3. The apparatus for treating desulfurization waste water according to claim 2, wherein the side wall of the guide zone is a slope, and the slope converges toward a side away from the accommodation zone.
4. The apparatus for treating desulfurization waste water according to claim 1, wherein each of said hermetic mercury removal tanks comprises:
the accommodating box body is communicated with the clarification tank and the external gas source and is also communicated with the oxidation absorption device; the accommodating box body is provided with the water outlet;
and the stirring device is at least partially arranged in the accommodating box body.
5. The apparatus for treating desulfurization waste water according to claim 1, wherein the oxidation absorption device contains a strong oxide absorbent.
6. The apparatus for treating desulfurization waste water according to claim 1, wherein the second reaction tank comprises:
the flocculation tank body is close to the first reaction tank and is used for containing the suspension and the flocculating agent overflowing from the first reaction tank;
the buffer tank body is close to the flocculation tank body and the clarification tank and is used for containing substances overflowing from the flocculation tank body.
7. The apparatus for treating desulfurization wastewater according to claim 6, wherein the flocculation tank, the buffer tank and the first reaction tank have the same capacity.
8. The apparatus for treating desulfurization waste water according to claim 1, characterized in that said apparatus for treating desulfurization waste water further comprises: and the protection device is communicated with the oxidation absorption device.
9. The apparatus for treating desulfurization waste water according to claim 8, wherein said protection means contains activated carbon therein.
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| CN110642446A (en) * | 2019-09-12 | 2020-01-03 | 上海申欣环保实业有限公司 | Method and equipment for treating desulfurization wastewater |
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