CN210286872U - Device for reducing COD concentration in limestone gypsum wet desulphurization wastewater - Google Patents
Device for reducing COD concentration in limestone gypsum wet desulphurization wastewater Download PDFInfo
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- CN210286872U CN210286872U CN201920840773.9U CN201920840773U CN210286872U CN 210286872 U CN210286872 U CN 210286872U CN 201920840773 U CN201920840773 U CN 201920840773U CN 210286872 U CN210286872 U CN 210286872U
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Abstract
A device for reducing COD concentration in limestone gypsum wet desulphurization wastewater comprises an integrated equipment body, wherein the integrated equipment body is divided into a plurality of stirring areas, a baffled reaction area, a water distribution area and a sedimentation area, a sludge discharge area is arranged below the sedimentation area, a dosing device is arranged at a position corresponding to the stirring areas, partition plates are arranged between the stirring areas, between the stirring areas and the reaction area, and between the stirring areas and the water distribution area, and through flow holes are formed in the partition plates; a rectifying wall is arranged between the water distribution area and the sludge discharge area, and the settling area and the sludge discharge area are separated by a settling filler layer; one side of the settling zone is provided with a water outlet groove, and the bottom of the sludge discharge zone is provided with a sludge discharge pipeline. The device can realize that desulfurization waste water can directly get into the strong oxidation system of fenton, need not carry out other preliminary treatment. The reaction time is short, the volume of the reaction equipment is small, and the investment cost is saved. The whole process technology does not use a micropore aeration device, does not cause blockage, does not generate dead zones, and has stable operation. The dosage of the medicament used for one-time pH adjustment is reduced before water enters the system, and the operating cost is reduced.
Description
Technical Field
The utility model relates to a waste water treatment technical field, in particular to reduce device of COD concentration in limestone gypsum wet flue gas desulfurization waste water.
Background
The limestone gypsum wet desulphurization process is one of wet desulphurization, and is the standard desulphurization process technology which has the widest application range and the most mature process technology in the world at present. Limestone or lime is used as a desulfurization absorbent, the limestone is crushed and ground into powder, the powder and water are mixed and stirred into absorption slurry, the lime is digested and then added with water to prepare absorbent slurry, the slurry is contacted and mixed with flue gas in an absorption tower, sulfur dioxide in the flue gas, calcium carbonate in the slurry and blown oxidizing air are subjected to chemical reaction to generate gypsum, the desulfurization gypsum slurry is dehydrated and recovered by a dehydration device, and the generated filtrate water is desulfurization wastewater. Desulfurization waste water is the waste water of a difficult processing, is acidity, and pH value is about 4.1 ~ 6.5, and the corrosivity is stronger, and the salinity content is high, and suspended solid content is higher, contains heavy metal ion, and easy scale deposit is very strong to the corrosivity of sweetener and pipeline. The domestic desulfurization wastewater treatment process is mainly a triple-box process and mainly comprises the procedures of neutralization, sedimentation, flocculation, clarification and the like. Because the desulfurization wastewater contains different reductive substances such as unreacted sulfate, sulfite, bisulfite and the like, the COD (chemical oxygen demand) concentration of the desulfurization wastewater is higher, and the discharge requirement cannot be met, so that the chemical adding amount of the desulfurization wastewater treated by the triple box process is too large, and the effluent cannot reach the standard.
The prior art mainly utilizes the ozone oxidation processing system to handle, this system includes oxygenerator, ozone generator, catalytic oxidation pond and tail gas destruction device, waste water gets into the catalytic oxidation pond of ozone oxidation processing system after adding medicine coagulation processing, set up titanium plate aerator in the catalytic oxidation pond, ozone passes through titanium plate aerator diffusion in aqueous, the waste water and the ozone intensive mixing that come in, sulfite and organic amine liquid oxidation in with the waste water through ozone, make sulfite oxidation sulfuric acid radical, with organic amine oxidative decomposition, carry out the oxidation desorption COD reaction, thereby make COD waste water concentration reduce and realize discharge to reach standard. And residual ozone enters a tail gas destruction device to be destroyed, the temperature is raised to 60 ℃ through a heater, then the residual ozone is decomposed into oxygen through a catalyst in a tail gas ozone destruction tank, and the decomposed oxygen is discharged to the atmosphere through a fan. The main disadvantages of the above process are: firstly, the investment and operating cost of the ozone generator are high, which restricts the application of the ozone generator; secondly, ozone is a toxic and corrosive gas, which can intensify combustion, is unstable in state and easy to decompose, and can cause dangers due to improper use, poor maintenance, material replacement and the like; thirdly, the titanium plate aerator in the pool is easy to block, uneven water distribution is caused when the titanium plate aerator is not found in time, a dead zone is generated, and the treatment effect is reduced due to long-time operation; fourthly, before entering the ozone oxidation treatment system, the desulfurization wastewater needs to be subjected to coagulating sedimentation pretreatment, the process is complex, the maintenance and management are inconvenient, and the maintenance, the overhaul and the damage point finding are difficult.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems existing in the prior art, the utility model provides a device for reducing the COD concentration in limestone gypsum wet desulphurization wastewater.
The utility model provides a technical scheme that its technical problem adopted is: the device for reducing the COD concentration in the limestone-gypsum wet desulphurization wastewater comprises an integrated equipment body, wherein the integrated equipment body is divided into a plurality of stirring areas, a baffled reaction area, a water distribution area and a sedimentation area, a sludge discharge area is arranged below the sedimentation area, a dosing device is arranged at a position corresponding to the stirring areas, partition plates are arranged among the stirring areas, between the stirring areas and the reaction area, and between the stirring areas and the water distribution area, and through-flow holes are formed in the partition plates; a rectifying wall is arranged between the water distribution area and the sludge discharge area, and the settling area and the sludge discharge area are separated by a settling filler layer; one side of the settling zone is provided with a water outlet groove, and the bottom of the sludge discharge zone is provided with a sludge discharge pipeline.
Further, the stirring area includes five, is first stirring area, second stirring area, third stirring area, fourth stirring area and fifth stirring area respectively, and every stirring area all installs the agitator, is the reaction zone between first stirring area, second stirring area and third stirring area and fourth stirring area and fifth stirring area, and charge device adds the acid to first stirring area, adds ferrous sulfate to second stirring area, adds hydrogen peroxide solution to third stirring area, adds PAM to fourth stirring area, adds liquid alkali to fifth stirring area.
Furthermore, the height positions of two adjacent circulation holes on the partition board are different.
Furthermore, the reaction zone is divided into a plurality of baffled reaction zones by partition plates.
Furthermore, a plurality of water distribution holes are formed in the rectifying wall, and the water distribution area and the sludge discharge area are communicated through the water distribution holes.
Furthermore, the total open area of the water distribution holes of the flow-rectifying wall is 6-20% of the water passing section.
Furthermore, the sedimentation packing layer is a layer densely provided with inclined pipes or inclined plates, and the sedimentation area and the sludge discharge area are communicated through the inclined pipes or the inclined plates.
Further, there is mud to collect and fights mud drain zone bottom, mud is collected and fights and is formed by the rectangular board concatenation, and mud is collected and is fought the corresponding mud pipe of installation in the end of fighting.
To sum up, the utility model discloses an above-mentioned technical scheme's beneficial effect as follows:
the utility model discloses utilize the OH degradation pollutant that Fe2+ catalytic decomposition H2O2 produced, and the Fe3+ that generates takes place the coagulating sedimentation and gets rid of partial suspended solid, therefore fenton's reagent has oxidation and thoughtlessly congeals two kinds of effects in water treatment. On the one hand, the oxidation effect on organic matters is a free radical reaction which is carried out by the action of Fe2+ and H2O2 to generate hydroxyl free radicals OH with extremely strong oxidizing ability; on the other hand, the Fe (OH)3 colloid generated by the reaction has the functions of flocculation and adsorption, and can also remove part of suspended matters in the desulfurization wastewater, thereby providing convenience for the subsequent process, reducing the investment and the operating cost, and simultaneously leading the colloid to reach the discharge standard required by the local environmental protection department.
Drawings
Fig. 1 is a top view of the present invention.
Fig. 2 is a vertical view of the present invention.
In the figure:
10, an integrated equipment body, 111 a first stirring area, 112 a second stirring area, 113 a third stirring area, 114 a fourth stirring area, 115 a fifth stirring area, 12 a reaction area, 121 a partition plate, 13 a water distribution area, 14 a settling area, 15 a sludge discharge area, 151 a sludge collection hopper, 16 stirrers, 17 partition plates and 18 through-flow holes;
20, a medicine adding device;
30 flow-rectifying walls and 31 water distribution holes;
40 depositing a filler layer;
50, water outlet groove;
60 a sludge discharge pipeline.
Detailed Description
The features and principles of the present invention will be described in detail below with reference to the accompanying drawings, and the illustrated embodiments are only for explaining the present invention, and do not limit the scope of the present invention.
As shown in fig. 1 and 2, the utility model comprises an integrated equipment body 1, wherein the integrated equipment body 1 is made of a corrosion-resistant structure, and different volumes can be designed according to different water quantities; the same amount of water can be added as required, the middle parts are connected by adopting the partition plates 17, and the wastewater adopts the staggered convection, so that the reaction effect is improved.
The integrated equipment body 1 is divided into a plurality of stirring areas, baffling reaction areas 12, a plurality of baffling reaction areas 12 are divided into by a partition plate 121, a water distribution area 13, a settling area 14, and a sludge discharge area 15 is arranged below the settling area 14.
The stirring area is provided with dosing devices 20 (matched dosing pumps) at corresponding positions, partition plates 17 are arranged between the stirring areas, between the stirring areas and the reaction area 12 and between the stirring area water distribution areas 13, and through flow holes 18 are formed in the partition plates 17.
A rectifying wall 30 is arranged between the water distribution area 13 and the sludge discharge area 15, and the settling area 14 and the sludge discharge area 15 are separated by a settling filler layer 40. The sedimentation packing layer 40 is a layer densely provided with inclined pipes or inclined plates and is communicated with the sedimentation area 14 and the sludge discharge area 15 through the inclined pipes or the inclined plates. The rectifying wall 30 is provided with a plurality of water distribution holes 31, the water distribution area 13 and the sludge discharge area 15 are communicated through the water distribution holes 31, the total opening area of the water distribution holes 31 of the rectifying wall 30 is 6-20% of the water passing section, and the effect of uniform water distribution is achieved.
One side of the settling zone 14 is provided with a water outlet groove 50, and the water outlet groove 50 is an overflow type water collecting groove and collects the outlet water of the device. The bottom of the sludge discharge area 15 is provided with a sludge discharge pipeline 60, and sludge is discharged from the sludge discharge pipeline 60.
The stirring district includes five, is first stirring district 111, second stirring district 112, third stirring district 113, fourth stirring district 114 and fifth stirring district 115 respectively, and agitator 16 is all installed in every stirring district, utilizes agitator 16 to stir the waste water after adding the medicine, guarantees the treatment effect, prevents to deposit the siltation. The five stirring areas are respectively a first stirring area 111, a second stirring area 112, a third stirring area 113, a fourth stirring area 114 and a fifth stirring area 115, a reaction area 12 is arranged between the five stirring areas, and the dosing device 20 adds acid to the first stirring area 111 to adjust the pH value of the desulfurization wastewater to be about 3.5-4.0. Adding ferrous sulfate into the second stirring area 112, adding hydrogen peroxide into the third stirring area 113, and mixing the materials according to the proportion: ferrous sulfate: hydrogen peroxide: and adding ferrous sulfate and hydrogen peroxide into the second stirring area 112 and the third stirring area 113 in sequence to form a Fenton reagent, wherein the COD is 2:1:1 in mass concentration.
The desulfurization wastewater passes through the first to third stirring zones 113 and then is baffled by the reaction zone 12, and the desulfurization wastewater is reacted in the integrated body equipment for about 60min under the action of the Fenton reagent; inorganic reducing substances in the wastewater are oxidized to remove COD, the concentration of the COD in the desulfurization wastewater is reduced at the moment, the process is applied to remove the COD, and the COD index is ensured to reach the standard. The wastewater enters a fourth stirring area 114 after baffling reaction, PAM (polyacrylamide) solution of 3-5 per mill is added into the fourth stirring area 114, and liquid caustic soda is added into a fifth stirring area 115 to adjust the pH value.
Under the acidic condition, Fe2+ is used for catalyzing and decomposing OH degradation pollutants generated by H2O2, the generated Fe3+ is subjected to coagulating sedimentation to remove part of suspended matters, meanwhile, polyacrylamide is added to increase the flocculation effect, and liquid alkali is used for adjusting the pH value.
The height positions of two adjacent circulation holes on the partition plate 17 are different, so that more baffling effects on the wastewater can be ensured, and the reaction time and the reaction effect are increased.
There is sludge collection to fight 15 bottoms in mud discharging area 151, sludge collection fight 151 is formed by the concatenation of rectangular board, and sludge collection fights 151's inclined plane and is convenient for the concentrated collection of mud, and sludge collection fights 151's fill end and corresponds installation mud pipe way 60, and mud is followed mud pipe way 60 and is discharged.
The Fenton reagent is formed by adding drugs and stirring, and the concentration of COD in the desulfurization wastewater is reduced by utilizing the strong oxidation effect of the Fenton reagent. The water inflow forms a Fenton reagent by adding medicines, the Fenton reagent reacts for 60min in the reaction zone 12, the Fenton reagent enters the water distribution zone 13 by adding medicines and stirring, the sedimentation effect is improved by utilizing the shallow sedimentation principle, the water outlet of the water outlet tank 50 is utilized, and the sludge is discharged through the sludge discharge pipeline 60, so that the effect of reducing the COD concentration and the suspended matter concentration is realized.
The device can realize that desulfurization waste water can directly get into the strong oxidation system of fenton, need not carry out other preliminary treatment. The reaction time is short, the volume of the reaction equipment is small, and the investment cost is saved. The whole process technology does not use a micropore aeration device, does not cause blockage, does not generate dead zones, and has stable operation. The dosage of the medicament used for one-time pH adjustment is reduced before water enters the system, and the operating cost is reduced. The desulfurization wastewater enters a triple-box process after being treated, so that the dosage of alkali adjustment is saved. The process technology is safe, the equipment is easy to replace, and the maintenance is convenient.
The utility model discloses utilize the OH degradation pollutant that Fe2+ catalytic decomposition H2O2 produced, and the Fe3+ that generates takes place the coagulating sedimentation and gets rid of partial suspended solid, therefore fenton's reagent has oxidation and thoughtlessly congeals two kinds of effects in water treatment. On the one hand, the oxidation effect on organic matters is a free radical reaction which is carried out by the action of Fe2+ and H2O2 to generate hydroxyl free radicals OH with extremely strong oxidizing ability; on the other hand, the Fe (OH)3 colloid generated by the reaction has the functions of flocculation and adsorption, and can also remove part of suspended matters in the desulfurization wastewater, thereby providing convenience for the subsequent process, reducing the investment and the operating cost, and simultaneously leading the colloid to reach the discharge standard required by the local environmental protection department.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, which is defined by the appended claims.
Claims (8)
1. A device for reducing COD concentration in limestone gypsum wet desulphurization wastewater is characterized by comprising an integrated equipment body, wherein the integrated equipment body is divided into a plurality of stirring areas, a baffled reaction area, a water distribution area and a sedimentation area, a sludge discharge area is arranged below the sedimentation area, a dosing device is arranged at a position corresponding to the stirring areas, partition plates are arranged between the stirring areas, between the stirring areas and the reaction area and between the stirring areas and the water distribution area, and through-flow holes are formed in the partition plates; a rectifying wall is arranged between the water distribution area and the sludge discharge area, and the settling area and the sludge discharge area are separated by a settling filler layer; one side of the settling zone is provided with a water outlet groove, and the bottom of the sludge discharge zone is provided with a sludge discharge pipeline.
2. The apparatus according to claim 1, wherein the number of the stirring zones is five, each stirring zone is provided with a stirrer, and the stirrer is a first stirring zone, a second stirring zone, a third stirring zone, a fourth stirring zone and a fifth stirring zone, a reaction zone is arranged between the first stirring zone, the second stirring zone and the third stirring zone and between the fourth stirring zone and the fifth stirring zone, the dosing device adds acid to the first stirring zone, adds ferrous sulfate to the second stirring zone, adds hydrogen peroxide to the third stirring zone, adds PAM to the fourth stirring zone, and adds caustic soda to the fifth stirring zone.
3. The apparatus according to claim 1, wherein the two adjacent through holes on the partition board have different heights.
4. The apparatus for reducing the COD concentration in the limestone-gypsum wet desulfurization waste water according to claim 1, wherein the reaction zone is divided into a plurality of baffled reaction zones by partition plates.
5. The apparatus according to claim 1, wherein the rectifying wall has a plurality of water distribution holes, and the water distribution holes communicate the water distribution region and the sludge discharge region.
6. The apparatus for reducing the COD concentration in the limestone-gypsum wet desulphurization wastewater according to claim 5, wherein the total opening area of the water distribution holes of the rectification wall is 6-20% of the water cross section.
7. The apparatus of claim 1, wherein the layer of precipitated packing is a dense layer of inclined pipes or inclined plates, and the settling zone and the sludge discharge zone are connected by the inclined pipes or inclined plates.
8. The apparatus of claim 1, wherein the sludge collection hopper is arranged at the bottom of the sludge discharge area, the sludge collection hopper is formed by splicing strip plates, and a sludge discharge pipeline is correspondingly arranged at the bottom of the sludge collection hopper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920840773.9U CN210286872U (en) | 2019-06-05 | 2019-06-05 | Device for reducing COD concentration in limestone gypsum wet desulphurization wastewater |
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| CN201920840773.9U CN210286872U (en) | 2019-06-05 | 2019-06-05 | Device for reducing COD concentration in limestone gypsum wet desulphurization wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115594270A (en) * | 2022-10-09 | 2023-01-13 | 华能国际电力股份有限公司济宁电厂（Cn） | Desulfurization wastewater pretreatment agent, preparation method, pretreatment system and pretreatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115594270A (en) * | 2022-10-09 | 2023-01-13 | 华能国际电力股份有限公司济宁电厂（Cn） | Desulfurization wastewater pretreatment agent, preparation method, pretreatment system and pretreatment method |
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