CN210945261U - Coal chemical industry effluent treatment plant after reverse osmosis treatment - Google Patents
Coal chemical industry effluent treatment plant after reverse osmosis treatment Download PDFInfo
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- CN210945261U CN210945261U CN201921863001.3U CN201921863001U CN210945261U CN 210945261 U CN210945261 U CN 210945261U CN 201921863001 U CN201921863001 U CN 201921863001U CN 210945261 U CN210945261 U CN 210945261U
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Abstract
The utility model provides a coal chemical industry wastewater treatment device after reverse osmosis treatment, which belongs to the technical field of water treatment and comprises an acidification reactor and an MBR (membrane bioreactor); the acidification reactor is sequentially provided with a reaction section, a buffer section and a clarification section from bottom to top; the diameter of the reaction section is smaller than that of the buffer section, and the diameter of the buffer section is smaller than that of the clarification section; a biofilm carrier and salt-tolerant bacteria are added in the acidification reactor; the lower part of the reaction section is provided with a liquid inlet and a circulating liquid inlet, the upper part of the clarification section is provided with a liquid outlet and a circulating liquid outlet, the liquid outlet is communicated with the MBR, and the circulating liquid outlet is communicated with the circulating liquid inlet through a circulating controller; and an MBR plate type membrane hung with salt-tolerant bacteria is arranged in the MBR reactor. The utility model provides a thallus biofilm formation rate of biofilm formation carrier in the acidizing reactor is high, and is shock-resistant, improves the degradation rate of organic matter in the waste water.
Description
Technical Field
The utility model belongs to the technical field of water treatment, more specifically say, relate to a coal chemical industry effluent treatment plant after reverse osmosis handles.
Background
The zero-discharge water treatment process is widely applied in the field of coal chemical industry at present, has the advantages of high wastewater recovery rate, no waste discharge and the like, but has the defects that the concentrated water generated after the reuse water passes through the secondary reverse osmosis device has high organic matter content, namely the Total Organic Carbon (TOC) content, and can cause the phenomena of low purity, yellow color and the like of salt generated after evaporative crystallization as the inlet water of the evaporative crystallization.
The coal chemical wastewater treated by the secondary reverse osmosis device is characterized in that: the salinity is high, the ratio of Chemical Oxygen Demand (COD) to Biochemical Oxygen Demand (BOD) is less than 0.3, the salt is completely not suitable for the growth of biochemical bacteria, and the problems of low survival rate and low propagation speed of strains are solved by using a biochemical process. At present, no effective treatment technology, common aerobic catalytic oxidation, electrocatalytic oxidation technology and biochemical treatment technology are available for the water quality in the industry; the ozone catalytic oxidation and electrocatalytic oxidation technologies are common, but the operation cost is high, and the removal rate of organic matters is at most 65%; the greatest advantage of biochemical treatment is that no new impurities are introduced, the operation cost is low, high-salinity-resistant bacteria are selected, and the degradation of organic matters in water through biochemical treatment is the best solution after comprehensive consideration, but the survival rate and the growth speed of active bacteria on biochemical sludge are slow due to the environment of wastewater generated after reuse water passes through a secondary reverse osmosis device in the field of coal chemical industry, so that the biofilm formation rate and the impact resistance of the active bacteria are extremely low, and the further treatment effect on the wastewater is not ideal.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coal chemical industry effluent treatment plant after reverse osmosis handles, but it is poor to aim at solving this waste water biodegradability, and the hanging membrane rate of fungus is low, shock resistance is poor and the problem that the organic matter clearance is low.
In order to solve the above problem, the utility model adopts the following technical scheme: provided is a high-salt low B/C ratio wastewater treatment apparatus comprising: the acidification reactor and the MBR reactor are communicated;
the acidification reactor is sequentially provided with a reaction section, a buffer section and a clarification section from bottom to top; the diameter of the reaction section is smaller than that of the buffer section, and the diameter of the buffer section is smaller than that of the clarification section;
a biofilm carrier and salt-tolerant bacteria are added in the reaction section;
the lower part of the reaction section is provided with a liquid inlet and a circulating liquid inlet, the upper part of the clarification section is provided with a liquid outlet and a circulating liquid outlet, the liquid outlet is communicated with the MBR, and the circulating liquid outlet is communicated with the circulating liquid inlet through a circulating pump;
and an MBR plate type membrane of salt-tolerant bacteria is arranged in the MBR reactor.
As another embodiment of the present application, the reaction section and the buffer section are respectively provided with a sampling port.
As another embodiment of the present application, the diameter of the reaction section is 1/2-3/5 of the diameter of the buffer section; the diameter of the buffer section is 3/5-4/5 of the diameter of the clarification section.
As another embodiment of the present application, the volume of the biofilm carriers in the reaction section accounts for 1/4-1/3 of the volume of the acidification reactor.
As another example herein, the biofilm carrier is powdered activated carbon.
As another embodiment of the present application, a flow meter is connected between the circulation liquid outlet and the circulation liquid inlet.
As another embodiment of the present application, the MBR plate membrane is a hydrophobic polymeric membrane. As another embodiment of the present application, an aerator is provided in the MBR reactor.
The utility model provides a coal chemical industry effluent treatment plant after reverse osmosis handles's beneficial effect lies in: compared with the prior art, in the coal chemical industry wastewater treatment device after reverse osmosis treatment, the diameter of the acidification reactor is gradually increased from bottom to top, the flow velocity of the corresponding wastewater after passing through the bottom reaction section inlet is gradually reduced in the reactor, thus ensuring that the retention time of the wastewater is long enough, ensuring that the turbidity of the water in the uppermost clarification zone of the acidification reactor is low, avoiding the active biofilm carrier from flowing into the MBR, reducing the loss of the active biofilm carrier, simultaneously controlling the internal liquid circulation by the acidification reactor through the circulation controller, not only ensuring that the active biofilm carrier does not precipitate, but also ensuring that the wastewater is fully contacted with the active biofilm carrier and reacts for many times, improving the survival rate of active bacteria, reducing the cost and improving the treatment efficiency, and large molecular weight organic matters in the wastewater subjected to primary treatment by the acidification reactor can be degraded into small molecular weight organic matters, the organic matter that molecular weight reduces can be thoroughly decomposed in getting into the MBR reactor after, through the utility model discloses well acidizing reactor and MBR reactor combine, improve the survival rate of active thallus greatly and hang the impact resistance of membrane rate and string membrane carrier, can make the organic matter content in the waste water reduce below 50 mg/L. The method solves the problems of slow biochemical biofilm formation and low TOC removal rate in the prior high-salt water treatment process, saves the sedimentation process, ensures the stability of the effluent quality in the production and operation process, has low operation cost and reduces the treatment cost.
Coal chemical industry waste water behind reverse osmosis treatment process the utility model discloses after the further processing, as the crystal water, can effectively avoid the problem that the crystal salt yellows.
Drawings
FIG. 1 is a schematic structural diagram of a wastewater treatment plant with high salt and low B/C ratio provided by an embodiment of the present invention;
in the figure: 1. a reaction section; 2. a buffer section; 3. a clarification section; 4. a liquid inlet; 5. a first sampling port; 6. a second sampling port; 7. a liquid outlet; 8. a circulating liquid outlet; 9. a circulating liquid inlet; 10. MBR reactor, 11, MBR plate type membrane; 12. an aerator 13, a circulation controller; 14. a flow meter.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a coal chemical wastewater treatment apparatus after reverse osmosis treatment according to the present invention is now described, which includes an acidification reactor and an MBR reactor 10;
the acidification reactor is sequentially provided with a reaction section 1, a buffer section 2 and a clarification section 3 from bottom to top; the diameter of the reaction section 1 is smaller than that of the buffer section 2, and the diameter of the buffer section 2 is smaller than that of the clarification section 3;
a biofilm carrier and salt-tolerant bacteria are added in the reaction section;
a liquid inlet 4 and a circulating liquid inlet 9 are arranged at the lower part of the reaction section 1, a liquid outlet 7 and a circulating liquid outlet 8 are arranged at the upper part of the clarification section 3, the liquid outlet 7 is communicated with the MBR 10, and the circulating liquid outlet 8 is communicated with the circulating liquid inlet 9 through a circulating controller 13;
and an MBR plate type membrane 11 for salt-tolerant bacteria is arranged in the MBR reactor 10.
The utility model discloses a coal chemical industry effluent treatment plant after reverse osmosis treatment, the diameter of acidification reactor is crescent from bottom to top, the velocity of flow after making waste water pass through inlet 4 of bottom reaction section 1 reduces gradually in the reactor, so can guarantee that waste water dwell time is enough long, can guarantee that the quality of water turbidity of acidification reactor topmost clarification zone is low, avoid active biofilm carrier to flow into MBR reactor 10, reduce the loss of active biofilm carrier, simultaneously the acidification reactor controls internal liquid circulation through circulation controller 13, can guarantee that active biofilm carrier does not precipitate, can make waste water and active biofilm carrier fully contact and react many times, improve the survival rate of active thallus, reduce cost is low, improve treatment efficiency, and the large molecular weight organic matter in the waste water that carries out preliminary treatment through acidification reactor can be degraded into small molecular weight organic matter, the organic matter that molecular weight reduces can be thoroughly decomposed in getting into MBR reactor 10 after, through the utility model discloses well acidizing reactor and MBR reactor 10 combine, improve the survival rate of active thallus greatly and the impact resistance of biofilm formation rate and biofilm formation carrier, can make the organic matter content in the waste water reduce below 50 mg/L. The method solves the problems of slow biochemical biofilm formation and low TOC removal rate in the prior high-salt water treatment process, saves the sedimentation process, ensures the stability of the effluent quality in the production and operation process, has low operation cost and reduces the treatment cost.
Coal chemical industry waste water behind reverse osmosis treatment process the utility model discloses after the further processing, as the crystal water, can effectively avoid the problem that the crystal salt yellows.
The water treatment process of the utility model is as follows:
taking secondary RO concentrated water with zero discharge in coal chemical industry, wherein the water quality index is that COD is 400mg/L, TOC is 200mg/L, B/C is 20%, and salinity is 4%;
the method comprises the steps of screening out halotolerant bacteria from a secondary RO concentrated water airing pool, culturing, putting cultured bacteria liquid into an acidification reactor filled with secondary RO concentrated water, carrying out closed aeration for 72 hours, keeping dissolved oxygen in the acidification reactor to be less than 0.5mg/L, keeping the dissolved oxygen in an MBR (membrane bioreactor) 10 to be 0.5-5mg/L, when water body MLSS in the acidification reactor is greater than 1000, continuously introducing wastewater from a liquid inlet 4, wherein the water inflow is 1.2L/h, simultaneously opening a circulation controller 13, controlling the flow of circulation liquid to be 1L/h, introducing clarified water flowing out of a liquid outlet 7 of the reactor into the MBR 10, continuously and completely degrading the organic matters of MBR, and discharging the wastewater treated by the MBR 10 from a water outlet of the MBR 10.
After one month of continuous treatment, the sedimentation performance of the biofilm carrier in the acidification reactor is detected, the sedimentation performance is good, and SV30 is 40%; the amount of sludge in the MBR reactor 10 became larger, with an SV30 of 70%.
When the wastewater discharged from the water outlet of the MBR 10 is detected, the removal rate of COD in the water reaches 70%, the color of the discharged water is obviously lightened, and the TOC content in the water is reduced to 45 mg/L.
Referring to fig. 1, as a specific embodiment of the present invention, a first sampling port 5 is disposed on the reaction section 1, and a second sampling port 6 is disposed on the buffer section 2.
In this embodiment, the sampling port one 5 arranged on the reaction section 1 can detect SV30 in the reaction solution in the reaction section 1 at any time, and the sedimentation rate of the active biofilm carrier in the reaction section 1 is determined by the value of SV30, so as to determine the biofilm formation rate of the bacteria on the biofilm carrier, and the larger the sedimentation rate of the active biofilm carrier is, the better the biofilm formation effect of the salt-tolerant bacteria is.
In this embodiment, the second sampling port 6 provided on the buffer section 2 can be used to detect the water quality in the buffer section 2 and determine the degradation rate of the organic substances.
As a specific implementation mode of the embodiment of the utility model, the diameter of the reaction section 1 is 1/2-3/5 of the diameter of the buffer section 2; the diameter of the buffer section 2 is 3/5-4/5 of the diameter of the clarification section 3.
In the embodiment, the diameter proportion of the reaction section 1, the buffer section 2 and the clarification section 3 is controlled to adjust the water flow speed of the wastewater in the reaction section 1, the buffer section 2 and the clarification section 3 after the wastewater enters the reactor, so that the flow speed of the wastewater entering the reaction section 1 is the maximum, the flow speed can realize the full contact and reaction of the wastewater and an active biofilm carrier, the flow speed of the wastewater entering the buffer section 2 through the reaction section 1 is reduced, the water and the active biofilm carrier are gradually separated, and the water and the active biofilm carrier are thoroughly separated after the wastewater reaches the clarification section 3, so that the active biofilm carrier is prevented from entering the MBR reactor 10 to cause the loss of the active biofilm carrier; not only ensures that the film-forming carrier in the acidification reactor does not sink, but also ensures that the liquid outlet 7 of the clarification area does not carry mud.
As a specific implementation mode of the embodiment of the utility model, the volume of the membrane carrier in the acidification reactor accounts for 1/4-1/3 of the volume of the acidification reactor.
The addition of the biofilm carrier in the embodiment can ensure the sufficient contact of the wastewater and the biofilm carrier and can avoid the loss of part of the biofilm carrier.
As a specific implementation manner of the embodiment of the present invention, the biofilm carrier is powdered activated carbon.
The powdered activated carbon in the embodiment is used as a film forming carrier, and has the characteristics of large specific surface area, light weight and contribution to film forming.
Referring to fig. 1, as a specific implementation manner of the embodiment of the present invention, a flow meter 14 is connected between the circulation liquid outlet 8 and the circulation liquid inlet 9.
The flowmeter in the embodiment can monitor the flow of the circulating liquid at any time, and ensures that organic matters in the wastewater in the acidification reactor are fully contacted and reacted with the biofilm carrier.
Referring to fig. 1, as a specific implementation manner of the embodiment of the present invention, the MBR plate membrane 11 is a hydrophobic polymeric membrane.
The hydrophobic polymeric membrane in the embodiment can realize bubble-free aeration under the condition that the gas partial pressure is kept lower than the bubble point in the MBR, thereby improving the contact time and the oxygen transfer efficiency, being beneficial to the reasonable control of the aeration process and being not influenced by the factors of the bubble size and the residence time in the traditional aeration.
Referring to fig. 1, as a specific implementation manner of the embodiment of the present invention, an aerator 12 is disposed in the MBR reactor 10.
The aerator in the embodiment improves the oxygen transfer efficiency in the MBR and the contact time of the wastewater and the active bacteria, so that the organic matters are degraded more thoroughly.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A coal chemical industry wastewater treatment device after reverse osmosis treatment is characterized by comprising an acidification reactor and an MBR (membrane bioreactor);
the acidification reactor is sequentially provided with a reaction section, a buffer section and a clarification section from bottom to top; the diameter of the reaction section is smaller than that of the buffer section, and the diameter of the buffer section is smaller than that of the clarification section;
a biofilm carrier and salt-tolerant bacteria are added in the reaction section;
the lower part of the reaction section is provided with a liquid inlet and a circulating liquid inlet, the upper part of the clarification section is provided with a liquid outlet and a circulating liquid outlet, the liquid outlet is communicated with the MBR, and the circulating liquid outlet is communicated with the circulating liquid inlet through a circulating pump;
and an MBR plate type membrane of salt-tolerant bacteria is arranged in the MBR reactor.
2. The coal chemical industry wastewater treatment device after reverse osmosis treatment according to claim 1, wherein the reaction section and the buffer section are respectively provided with a sampling port.
3. The coal chemical industry wastewater treatment device after reverse osmosis treatment of claim 1, wherein the diameter of the reaction section is 1/2-3/5 of the diameter of the buffer section; the diameter of the buffer section is 3/5-4/5 of the diameter of the clarification section.
4. The coal chemical industry wastewater treatment device after reverse osmosis treatment of claim 1, wherein the volume of the membrane-hanging carrier in the reaction section accounts for 1/4-1/3 of the volume of the acidification reactor.
5. The coal chemical industry wastewater treatment device after reverse osmosis treatment of claim 1 or 4, wherein the biofilm carrier is powdered activated carbon.
6. The coal chemical industry wastewater treatment device after reverse osmosis treatment according to claim 1, wherein a flow meter is connected between the circulating liquid outlet and the circulating liquid inlet.
7. The coal chemical industry wastewater treatment device after reverse osmosis treatment of claim 1, wherein the MBR plate-type membrane is a hydrophobic polymeric membrane.
8. The apparatus for treating coal chemical industry wastewater after reverse osmosis treatment according to claim 1, wherein an aerator is provided in the MBR reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921863001.3U CN210945261U (en) | 2019-10-31 | 2019-10-31 | Coal chemical industry effluent treatment plant after reverse osmosis treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921863001.3U CN210945261U (en) | 2019-10-31 | 2019-10-31 | Coal chemical industry effluent treatment plant after reverse osmosis treatment |
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| Publication Number | Publication Date |
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| CN210945261U true CN210945261U (en) | 2020-07-07 |
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| CN201921863001.3U Active CN210945261U (en) | 2019-10-31 | 2019-10-31 | Coal chemical industry effluent treatment plant after reverse osmosis treatment |
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