CN211644870U - Device for treating low-concentration COD wastewater - Google Patents
Device for treating low-concentration COD wastewater Download PDFInfo
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- CN211644870U CN211644870U CN201922308795.3U CN201922308795U CN211644870U CN 211644870 U CN211644870 U CN 211644870U CN 201922308795 U CN201922308795 U CN 201922308795U CN 211644870 U CN211644870 U CN 211644870U
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Abstract
The utility model discloses a handle device of low concentration COD waste water, the device is including the collecting pit that is used for collecting waste water that connects gradually for catalytic oxidation reaction's oxidation pond for get rid of the concentrated pond of remaining hydrogen peroxide, be used for separating aquatic material and producing the tubular membrane of clear water, and be used for receiving the clean water basin of play water, it has active carbon and hydrogen peroxide as catalyst and adsorbent to add in the oxidation pond, and installs the mixer, add the sodium bisulfite of adjusting the redox potential in the concentrated pond. The utility model discloses a recycling of catalyst has reduced the use amount of catalyst, widens reaction system's ph application scope, has simplified process flow, has improved water quality of water to the stability of going out water has been ensured.
Description
Technical Field
The utility model relates to a waste water treatment field especially relates to a handle device of low concentration COD waste water.
Background
With the improvement of environmental requirements, the discharge standard of wastewater is continuously improved, and the removal of pollutants by the conventional wastewater treatment process only transfers the pollutants from one form to another form, and the pollutants cannot be completely removed. And after the conventional wastewater treatment process, the removal of effluent COD can reach the limit, and the conventional process can not remove the organic pollutants which are difficult to degrade. However, the discharge standard of the waste water is improved at present, and if the waste water is recycled after advanced treatment, the COD of the treated waste water has higher requirements, and the treated waste water cannot be met by adopting the traditional treatment process.
Therefore, advanced oxidation technology is generally adopted to further remove the organic pollutants which are difficult to degrade. The oxidation process is mainly based on the formation of hydroxyl free radicals, and then the hydroxyl free radicals are utilized to degrade organic pollutants in water into carbon dioxide and water, have strong oxidizing capability and can directly oxidize trace organic matters in the water into water and carbon dioxide. The advanced oxidation process is commonly a Fenton method, hydrogen peroxide is decomposed to generate hydroxyl radicals under the catalysis of ferrous iron during the Fenton reaction, and complex organic matters can be oxidized and decomposed into small molecular substances through electron transfer and other ways due to the extremely high oxidation potential of the hydroxyl radicals, and the Fenton reaction can effectively degrade the organic matters, but the defects of low utilization rate of the hydrogen peroxide, low mineralization degree of the organic matters, narrow applicable pH value range and high catalyst input amount are needed.
Therefore, there is a need for improvement on the basis of the above, and a novel device is provided to improve the utilization rate of the catalyst and ensure the stability of the effluent.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a handle device of low concentration COD waste water, improve out water quality of water to ensure the stability of play water.
In order to achieve the above object, the utility model provides a following technical scheme: a device for treating low-concentration COD wastewater comprises a collecting tank, an oxidation tank, a concentration tank, a tubular membrane and a clean water tank, wherein the collecting tank is used for collecting wastewater, the oxidation tank is used for catalyzing oxidation reaction, the concentration tank is used for removing residual hydrogen peroxide, the tubular membrane is used for separating substances in water and generating clean water, and the clean water tank is used for receiving effluent; the oxidation pond is internally provided with active carbon and hydrogen peroxide which are used as a catalyst and an adsorbent, and the concentration pond is internally provided with sodium bisulfite for adjusting oxidation-reduction potential.
Preferably, the device further comprises a lifting pump, wherein the lifting pump is connected with the collecting tank and the oxidation tank and is used for conveying the wastewater in the collecting tank to the oxidation tank.
Preferably, the system further comprises a circulating pump which is connected with the concentration tank and the tubular membrane and is used for conveying water in the concentration tank to the tubular membrane.
Preferably, the concentration tank is further connected with a sludge pump, and the sludge pump is connected with a sludge collection tank and used for discharging sludge to the sludge collection tank.
Preferably, a stirrer for stirring the activated carbon and the hydrogen peroxide is arranged in the oxidation pond, and the activated carbon is used as both a catalyst and an adsorbent.
Preferably, the pH value in the oxidation pond is adjusted by adding NaOH or H2SO4And (6) adjusting.
Preferably, one end of the clean water tank is connected with the tubular membrane, and the other end of the clean water tank is connected with a discharge pump.
Preferably, the tubular membrane is also connected with the oxidation pond, and the tubular membrane generates circulating concentrated water which is returned to the oxidation pond.
The utility model has the advantages that:
1. the utility model discloses handle device of low concentration COD waste water has reduced the use amount of catalyst, can be suitable for wide range pH value to can realize the cyclic utilization of catalyst.
2. The energy consumption of the whole device is reduced, the equipment is convenient to use and maintain, and automatic operation is realized.
Drawings
FIG. 1 is a schematic structural view of a device for treating low concentration COD wastewater of the present invention;
FIG. 2 is a schematic flow chart of a method for treating low concentration COD wastewater according to the present invention.
Reference numerals: 1. the device for treating the low-concentration COD wastewater comprises a collecting tank 11, a collecting tank 12, an oxidation tank 13, a concentration tank 14, a tubular membrane 15, a clean water tank 16, a lifting pump 17, a circulating pump 18, a sludge pump 19 and a discharge pump.
Detailed Description
The technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
As shown in fig. 1, the present invention discloses a device 1 for treating low concentration COD waste water, which uses active carbon as catalyst, and after a series of treatment steps, obtains effluent with good water quality. The device 1 for treating the low-concentration COD wastewater comprises a collecting tank 11, an oxidation tank 12, a concentration tank 13, a tubular membrane 14 and a clean water tank 15 which are sequentially connected, wherein the low-concentration COD wastewater passes through the device 1 to obtain effluent which can reach the standard and is discharged or recycled after advanced treatment.
Collecting pit 11 is used for receiving the waste water of low concentration COD, collecting pit 11 through a elevator pump 16 with oxidation pond 12 is connected, and passes through elevator pump 16 carries waste water extremely in oxidation pond 12, oxidation pond 12 is used for catalytic oxidation reaction, and degrades the waste water of COD, add a certain amount of active carbon and hydrogen peroxide in the oxidation pond 12, active carbon is as catalyst and adsorbent, and the quantity adjusts according to the kind of different waste water, active carbon and hydrogen peroxide regard as the catalyst, realize more extensively to the application scope of pH value, pH value is through adding NaOH or H2SO4And (6) carrying out adjustment. The catalytic effect of the activated carbon is slightly lost with the extension of the catalytic time, so that a part of the activated carbon needs to be periodically discharged and new activated carbon needs to be supplemented, so that the whole device 1 is more thorough and effective in the process of treating wastewater. Be equipped with the mixer (not shown) in oxidation pond 12, the churning time and the stirring speed of mixer are adjusted according to the kind of different waste waters, when the active carbon was as the adsorbent, the pollutant in the waste water was adsorbed on the active carbon surface, forms the enrichment, simultaneously active carbon catalytic decomposition hydrogen peroxide forms hydroxyl radical, and on solid-liquid interface, hydroxyl radical and pollutant react, degrade, have improved reaction efficiency. The concentration tank 13 is connected with the oxidation tank 12 and is used for removing residual hydrogen peroxide, circulating reaction liquid and improving the suspension fixed concentration, the wastewater in the oxidation tank 12 enters the concentration tank 13 after being catalyzed and stirred, the concentration tank 13 is used for removing the hydrogen peroxide left after the reaction,so as to avoid influencing the effect of the subsequent treatment process. Sodium bisulfite is added into the concentration tank 13 as a balancing agent for balancing water quality to react with excessive hydrogen peroxide, so that the oxidation-reduction potential (ORP) in the water quality is controlled to be 90-110mv, and the wastewater is treated more thoroughly.
The tubular membrane 14 is connected with the concentration tank 13 through a circulating pump 17, the tubular membrane 14 is used for separating activated carbon particles to generate circulating concentrated water, and the separated circulating concentrated water containing the activated carbon particles is added into the oxidation tank 12 connected with the tubular membrane 14 again to improve the utilization rate and reduce the using amount of activated carbon. Clean water produced by the tubular membrane 14 enters a clean water tank 15, and one end of the clean water tank 15 is connected with the tubular membrane 14, and the other end is connected with a discharge pump 19. The water in the clean water tank 15 is treated differently according to the water quality, if the water reaches the standard, the water is discharged, and if the water does not reach the standard, the water can be recycled after deep treatment.
Concentrated pond 13 still is connected with a sludge pump 18, sludge pump 18 is connected with a mud collecting pit (not shown), sludge pump 18 is used for receiving the mud that waste water produced after concentrated pond 13 reaction, and carry mud extremely in the mud collecting pit, then through filter-pressing dehydration to handle the mud that produces, the mud that produces is activated carbon sludge, regularly carries out recovery processing to the not good activated carbon of catalytic effect, thereby makes the reaction more thorough, ensures out water quality of water.
As shown in FIG. 2, the method for treating low concentration COD wastewater disclosed by the present invention comprises the following steps:
s1, collecting the wastewater in the collection tank 11, and conveying the wastewater into the oxidation tank 12 through the lift pump 16;
s2, adding a certain amount of activated carbon and hydrogen peroxide into the oxidation pond 12, stirring by using a stirrer in the oxidation pond 12, and conveying the wastewater after oxidation treatment into the concentration pond 13;
s3, adding sodium bisulfite into the concentration tank 13 for stirring with excessive hydrogen peroxide, so as to adjust the oxidation-reduction potential of the water, and sending the treated water into the tubular membrane 14;
s4, removing active carbon particles in the wastewater in the tubular membrane 14, separating the active carbon, and adding the separated active carbon particles into the oxidation pond 12 again;
and S5, collecting the treated water in a clean water tank 15, judging the quality of the treated water by the clean water tank 15, discharging the treated water through the discharge pump 19 if the treated water reaches the discharge standard, and discharging the treated water to a subsequent device through the discharge pump 19 for recycling after advanced treatment if the treated water does not reach the discharge standard.
Specifically, in S2, after the wastewater is sent to the oxidation pond 12, activated carbon and hydrogen peroxide are added, and the rotation speed and time of the stirrer in the oxidation pond 12 can be adjusted according to wastewater with different concentrations of COD. The ratio of hydrogen peroxide to activated carbon ranges from 200:1 to 60: 1, the stirring speed range of the stirrer is 60-80rpm, the stirring time range is 1-3h, and the oxidation reaction in the oxidation pond 12 ensures that the oxidation-reduction potential range is 600-650 mv. Further, NaOH or H is added to the oxidation pond 122SO4And the pH value is adjusted to meet the requirements of COD wastewater with different concentrations on the pH value. In S3, the redox potential is controlled at 90-110mv by adding sodium bisulfite, and the residual hydrogen peroxide is removed to avoid affecting the effect of the subsequent treatment process. In S4, the tubular membrane 14 separates the activated carbon particles in the water and adds the activated carbon particles into the oxidation pond 12 again, so that the activated carbon particles can be recycled and the amount of the medicament used can be reduced. At S5, the water in the clean water basin 15 is subjected to a determination to confirm that the discharge standard is met.
The first embodiment is as follows:
when the biochemical effluent with COD concentration of about 200mg/L is collected in the collection tank 11, the biochemical effluent is conveyed into the oxidation tank 12 through the lifting pump, and NaOH or H is added into the oxidation tank 122SO4Adjusting the pH value to be 7, adding 300mg/L of hydrogen peroxide and 2-5mg/L of active carbon into the oxidation pond 12, controlling the oxidation-reduction potential at 600-650mv, stirring the wastewater in the oxidation pond 12 at the rotating speed of 80rpm by a stirrer for 2h, then conveying the wastewater to the concentration pond 13, adding sodium bisulfite into the concentration pond 13 to ensure that the oxidation-reduction potential is reduced to 650mvThe potential returns to 90-110mv, the treated membrane is conveyed to a clean water tank 15 through a pipe type membrane 14, the COD concentration can be reduced to 30mg/L, and the COD removal rate is 85%.
Example two:
when the biochemical effluent with COD concentration of about 150mg/L is collected in the collection tank 11, the biochemical effluent is conveyed into the oxidation tank 12 through the lift pump 16, and NaOH or H is added into the oxidation tank 122SO4Adjusting the pH value to be 8-8.5, adding 300mg/L of hydrogen peroxide and 2-5mg/L of active carbon into the oxidation pond 12, controlling the oxidation-reduction potential at the moment to be 600-650mv, stirring the wastewater in the oxidation pond 12 for 2 hours at the rotating speed of 80rpm by a stirrer, then conveying the wastewater to the concentration pond 13, adding sodium bisulfite into the concentration pond 13 to return the oxidation-reduction potential to 90-110mv, conveying the wastewater to the clear water pond 15 through the tubular membrane 14 after treatment, wherein the COD concentration at the moment can be reduced to 50mg/L, and the removal rate of COD is 67%.
Example three:
when the biochemical effluent with the COD concentration of about 300mg/L is collected in the collection tank 11, the biochemical effluent is conveyed into the oxidation tank 12 through the lifting pump, and NaOH or H is added into the oxidation tank 122SO4Adjusting the pH value to be equal to 3, adding 600mg/L of hydrogen peroxide in the oxidation pond 12, adding 5-10mg/L of active carbon, controlling the oxidation-reduction potential at 600-650mv, stirring the wastewater in the oxidation pond 12 for 2h at the rotating speed of 80rpm by a stirrer, then conveying the wastewater to the concentration pond 13, adding sodium bisulfite in the concentration pond 13 to return the oxidation-reduction potential to 90-110mv, conveying the wastewater to the clear water pond 15 through the tubular membrane 14 after treatment, wherein the COD concentration at the moment can be reduced to 80mg/L, and the removal rate of COD is 73%.
The utility model discloses the processing procedure makes the effectual realization cyclic utilization of active carbon ability to simplify process flow, improve out water quality of water, also improve out water stability.
The technical contents and features of the present invention have been disclosed as above, however, those skilled in the art can still make various substitutions and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention, therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications without departing from the present invention, and should be covered by the claims of the present patent application.
Claims (8)
1. A device for treating low-concentration COD wastewater is characterized by comprising a collecting tank, an oxidation tank, a concentration tank, a tubular membrane and a clean water tank, wherein the collecting tank is used for collecting wastewater, the oxidation tank is used for catalyzing oxidation reaction, the concentration tank is used for removing residual hydrogen peroxide, the tubular membrane is used for separating substances in water and generating clean water, and the clean water tank is used for receiving effluent; the oxidation pond is internally provided with active carbon and hydrogen peroxide which are used as a catalyst and an adsorbent, and the concentration pond is internally provided with sodium bisulfite for adjusting oxidation-reduction potential.
2. The apparatus for treating low concentration COD wastewater according to claim 1, further comprising a lift pump connected to said collection tank and said oxidation tank for delivering wastewater in said collection tank to said oxidation tank.
3. The apparatus for treating low concentration COD wastewater according to claim 1, further comprising a circulation pump connecting the concentration tank and the tubular membrane for delivering water in the concentration tank to the tubular membrane.
4. The apparatus of claim 1, wherein the thickening tank is further connected to a sludge pump, and the sludge pump is connected to a sludge collecting tank for discharging sludge to the sludge collecting tank.
5. The apparatus for treating low concentration COD wastewater according to claim 1, wherein a stirrer for stirring the activated carbon and hydrogen peroxide is provided in the oxidation tank, and the activated carbon is used as both the catalyst and the adsorbent.
6. The apparatus for treating low concentration COD wastewater according to claim 1, wherein the pH value in the oxidation pond is adjusted by adding NaOH or H2SO4And (6) adjusting.
7. The apparatus for treating low concentration COD wastewater according to claim 1, wherein one end of said clean water tank is connected to the tubular membrane and the other end is connected to a drain pump.
8. The apparatus for treating low concentration COD wastewater according to claim 1, wherein said tubular membrane is further connected to said oxidation tank, said tubular membrane producing a circulating concentrated water, said circulating concentrated water being returned to said oxidation tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922308795.3U CN211644870U (en) | 2019-12-20 | 2019-12-20 | Device for treating low-concentration COD wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922308795.3U CN211644870U (en) | 2019-12-20 | 2019-12-20 | Device for treating low-concentration COD wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110845050A (en) * | 2019-12-20 | 2020-02-28 | 苏州依斯倍环保装备科技有限公司 | Device and method for treating low-concentration COD (chemical oxygen demand) wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110845050A (en) * | 2019-12-20 | 2020-02-28 | 苏州依斯倍环保装备科技有限公司 | Device and method for treating low-concentration COD (chemical oxygen demand) wastewater |
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