CN219217770U - Treatment device for low-concentration chromium-containing leather wastewater - Google Patents
Treatment device for low-concentration chromium-containing leather wastewater Download PDFInfo
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Abstract
A treatment device for low-concentration chromium-containing leather wastewater comprises an adjusting tank, a membrane separator, a resin adsorption tank, a leather waste treatment mechanism, a biochemical treatment mechanism and a chromium recovery mechanism; according to the method, the structure of the treatment device is limited, and the leather waste treatment mechanism and the chromium recovery mechanism are arranged, so that chromium ions in the leather waste water can be recovered, and the leather waste in the leather waste water can be subjected to reduction treatment, so that the chromium ions in the leather waste are recovered in one step, and potential pollution caused by chromium metal discharge is reduced to the greatest extent; the concentration of the leather wastewater entering the membrane separator is regulated by arranging the regulating tank, the concentrated solution entering the hydrolysis fermentation tank is treated under the conditions of strong alkali and anaerobic, so that the protein in the leather waste is hydrolyzed, and the volume of floccules in the concentrated solution is effectively reduced; and then the subsequent anaerobic tower treatment is matched to realize the reduction treatment of leather waste in the leather wastewater.
Description
Technical Field
The utility model belongs to the field of leather wastewater treatment, and particularly relates to a low-concentration chromium-containing leather wastewater treatment device.
Background
The leather industry is characterized by high inputs of raw materials and low yields of products, with approximately only 20-40% of the raw hide being converted to leather in the tanning. In the process of processing leather, colored crust leather waste is generated, and part of the waste enters the waste water. The waste water of the factory is treated by quality separation and is divided into high-concentration chromium-containing waste water and low-concentration chromium-containing waste water, and the sludge of the high-concentration chromium-containing waste water is directly treated according to dangerous waste, but along with the strengthening of the water environment management requirement, the sludge for treating the low-concentration chromium-containing waste water also becomes a major concern, and the chromium content becomes dangerous waste after exceeding the concentration specified in the sludge standard, so that the waste water treatment cost is greatly increased.
The main component of the waste in the leather deep processing process is protein, the waste is deformed after being processed, the biological activity is reduced, the waste still can be rotten and deteriorated after long-time fermentation, and the waste becomes harmful pollutants containing aldehydes, nitrogen, sulfur and the like, and the waste directly enters a water body and also causes serious pollution to the ecological environment; when the biodegradable leather waste is adopted, the chromium content in the leather is continuously released, which is unfavorable for biological treatment, and the chromium in the sludge can become a potential chromium-containing pollution source along with the outward transportation treatment of the sludge, so that the leather is required to be further improved.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a treatment device for low-concentration chromium-containing leather wastewater.
The utility model adopts the following technical scheme:
a treatment device for low-concentration chromium-containing leather wastewater comprises an adjusting tank, a membrane separator, a resin adsorption tank, a leather waste treatment mechanism, a biochemical treatment mechanism and a chromium recovery mechanism;
the regulating tank is used for regulating the pH value of the imported low-concentration chromium-containing leather wastewater;
the membrane separator is connected with the regulating tank and is used for carrying out membrane concentration, precipitation and separation on the low-concentration chromium-containing leather wastewater to obtain concentrated solution and waste liquid of leather-containing waste;
the resin adsorption tank is connected with the membrane separator and is used for adsorbing and recovering chromium ions in the entered waste liquid;
the leather waste treatment mechanism is connected with the membrane separator, receives the concentrated solution containing the leather waste, and carries out reduction treatment on the leather waste;
the biochemical treatment mechanism is connected with the resin adsorption tank and is used for carrying out biochemical treatment on the wastewater after the resin adsorption treatment so as to remove organic matters in the wastewater;
the chromium recovery mechanism is connected with the resin adsorption tank and comprises a desorption liquid storage tank for carrying out desorption treatment on the resin adsorption tank and a first sedimentation tank which is connected with the resin adsorption tank for collecting desorption waste liquid and carrying out sedimentation treatment.
Further, the leather waste treatment mechanism comprises a hydrolysis fermentation tank connected with the membrane separator for carrying out hydrolysis fermentation treatment on the leather waste concentrated solution, an anaerobic tower connected with the hydrolysis fermentation tank for decomposing substances generated by the hydrolysis fermentation tank, and a multi-medium filter connected with the anaerobic tower for carrying out filtration treatment on the concentrated solution coming out of the anaerobic tower.
Further, the leather waste treatment mechanism further comprises a first conveying pipe, one end of the first conveying pipe is connected with the multi-medium filter, the other end of the first conveying pipe is connected with the resin adsorption tank, and supernatant obtained through treatment of the multi-medium filter is conveyed into the resin adsorption tank through the first conveying pipe.
Further, the leather waste treatment mechanism further comprises a second conveying pipe, one end of the second conveying pipe is connected with the multi-medium filter, the other end of the second conveying pipe is connected with the regulating tank, and waste obtained by treatment of the multi-medium filter is conveyed into the regulating tank through the second conveying pipe.
Further, the biochemical treatment mechanism comprises a hydrolysis tank, an aerobic tank and a second sedimentation tank, wherein the hydrolysis tank is connected with the resin adsorption tank and used for degrading compounds in wastewater after resin adsorption treatment; the aerobic tank is connected with the hydrolysis tank, so that organic matters in the wastewater treated by the hydrolysis tank are further removed; the second sedimentation tank is connected with the aerobic tank, and the wastewater treated by the aerobic tank is subjected to sedimentation treatment again so as to obtain the wastewater which can be discharged.
Further, the biochemical treatment mechanism also comprises a transition tank which is connected between the hydrolysis tank and the resin adsorption tank and is used for adjusting the pH value of the wastewater entering the hydrolysis tank.
Further, the desorption liquid storage tank comprises a first liquid storage tank for storing hydrochloric acid concentrated liquid with the concentration of 3-4% and a second liquid storage tank for storing sodium hydroxide solution with the concentration of 4-5%.
Further, the membrane separator adopts a ceramic membrane, the pore diameter of the ceramic membrane is 150-250 micrometers, and the concentration multiple is 10-20 times.
Further, the anaerobic tower is an EGSB anaerobic tower or an IC anaerobic tower.
As can be seen from the above description of the present utility model, compared with the prior art, the present utility model has the following beneficial effects: according to the method, the structure of the treatment device is limited, and the leather waste treatment mechanism and the chromium recovery mechanism are arranged, so that chromium ions in the leather waste water are recovered, and the leather waste in the leather waste water can be subjected to reduction treatment, so that the chromium ions in the leather waste are further recovered, and potential pollution caused by chromium metal discharge is reduced to the greatest extent; the concentration of the leather wastewater entering the membrane separator is regulated by arranging the regulating tank, so that the concentrated solution entering the hydrolysis fermentation tank is treated under the conditions of strong alkali and anaerobism, protein in the leather waste is hydrolyzed, and the volume of floccules in the concentrated solution is effectively reduced; and then the subsequent anaerobic tower treatment is matched to realize the reduction treatment of leather waste in the leather wastewater.
Specifically limiting the structure of a biochemical treatment mechanism, firstly adjusting the pH value of the wastewater treated by the resin adsorption tank, and then carrying out biochemical treatment by matching with a hydrolysis tank and an aerobic tank to remove organic matters in the wastewater; the hydrolysis tank damages the structure of the organic compound through the action of microorganisms, converts macromolecules into micromolecular substances, further improves the biodegradability of the wastewater, and is convenient for the aerobic action of microorganisms in the aerobic tank so as to effectively reduce the COD concentration of the wastewater and obtain the wastewater meeting the discharge requirement.
Drawings
FIG. 1 is a structural flow diagram of the present utility model;
in the figure, a 1-regulating tank, a 2-membrane separator, a 3-leather waste treatment mechanism, a 4-resin adsorption tank, a 5-biochemical treatment mechanism, a 6-chromium recovery mechanism, a 31-hydrolysis fermentation tank, a 32-anaerobic tower, a 33-multi-medium filter, a 34-first conveying pipe, a 35-second conveying pipe, a 51-hydrolysis tank, a 52-aerobic tank, a 53-second sedimentation tank, a 54-transition tank, a 61-first liquid storage tank, a 62-second liquid storage tank and a 63-first sedimentation tank.
Detailed Description
The utility model is further described below by means of specific embodiments.
Referring to FIG. 1, a treatment device for low-concentration chromium-containing leather wastewater comprises an adjusting tank 1, a membrane separator 2, a leather waste treatment mechanism 3, a resin adsorption tank 4, a biochemical treatment mechanism 5 and a chromium recovery mechanism 6; specifically, the concentration of chromium in the low-concentration chromium-containing leather wastewater is 10-60mg/L.
The pH value of the low-concentration chromium-containing leather wastewater is regulated by the regulating tank 1, specifically, the pH value of the chromium-containing leather wastewater is regulated to 10-12 by the regulating tank 1 through adding sodium hydroxide, and an alkaline environment is provided for the subsequent hydrolysis and fermentation of leather waste.
The membrane separator 2 is connected with the regulating tank 1, and performs membrane concentration, precipitation and separation on the low-concentration chromium-containing leather wastewater to obtain a concentrated solution and a waste liquid of leather-containing waste; specifically, the membrane separator 2 adopts a ceramic membrane, the pore diameter of the ceramic membrane is 150-250 micrometers, and the concentration multiple is 10-20 times; furthermore, the membrane separator 2 is a device commonly used in the field of wastewater treatment, and the specific structure and working principle thereof will not be further described.
The resin adsorption tank 4 is connected with the membrane separator 2 and is used for adsorbing and recovering chromium ions in the entered waste liquid, and specifically, the resin adsorption tank 4 adopts mixed bed resin which is prepared by mixing sulfonic acid functional group gel type ion exchange resin and ammonium functional group strong base type anion exchange resin according to the mass ratio of 4-5:1, wherein the sulfonic acid functional group gel type ion exchange resin is used for adsorbing and recovering trivalent chromium ions, and the ammonium functional group strong base type anion exchange resin is used for adsorbing and recovering hexavalent chromium ions; specifically, the resin adsorption tank 4 is a device commonly used in the field of wastewater treatment, and the specific structure and working principle thereof will not be further described.
A leather waste treatment mechanism 3 connected to the membrane separator 2 for receiving the concentrated solution of the leather-containing waste and reducing the leather waste, comprising a hydrolysis fermentation tank 31 connected to the membrane separator 2 for carrying out hydrolysis fermentation treatment on the concentrated solution of the leather-containing waste, an anaerobic tower 32 connected to the hydrolysis fermentation tank 31 for continuously decomposing substances generated in the hydrolysis fermentation tank, a multi-medium filter 33 connected to the anaerobic tower 32 for filtering the concentrated solution from the anaerobic tower 32, a first conveying pipe 34 with one end connected to the multi-medium filter 33 and the other end connected to the resin adsorption tank 4, and a second conveying pipe 35 with one end connected to the multi-medium filter 33 and the other end connected to the regulating tank 1; specifically, the oxygen concentration in the hydrolysis tank 31 is lower than 0.1mg/L; when the leather waste is treated, the protein of the leather waste is hydrolyzed by the microorganisms in the hydrolysis fermentation tank 31, so that the volume of floccules in the concentrated solution is effectively reduced; then enters an anaerobic tower 32 to further decompose substances generated by the hydrolysis fermentation tank 31, then enters a multi-medium filter 33 to carry out filtration treatment, supernatant fluid and waste obtained by treatment are fed into a resin adsorption tank 4 through a first conveying pipe 34, and chromium ions in the supernatant fluid are adsorbed and recovered; the waste is conveyed to the regulating tank 1 through the second conveying pipe 35 and is reprocessed; further, the anaerobic tower 32 is an EGSB anaerobic tower or an IC anaerobic tower.
A chromium recovery mechanism 6 connected to the resin adsorption tank 4 and including a desorption liquid storage tank for desorbing the resin adsorption tank 4 and a first sedimentation tank 63 connected to the resin adsorption tank 4 for collecting and sedimenting the desorption waste liquid, wherein the desorption liquid storage tank includes a first liquid storage tank 61 for storing a hydrochloric acid solution with a concentration of 3-4% and a second liquid storage tank 62 for storing a sodium hydroxide solution with a concentration of 4-5%; during the resin desorption treatment, trivalent chromium ions in the resin adsorption tank 4 are desorbed through a hydrochloric acid solution, and hexavalent chromium ions in the resin adsorption tank are desorbed through a sodium hydroxide solution; the desorbed waste liquid after the desorption treatment is mixed in a first sedimentation tank 63, and then the pH of the desorbed waste liquid is adjusted to 4-5 by sodium hydroxide or hydrochloric acid, so that chromium ions in the desorbed liquid are precipitated, and a chromium precipitation recovery product is obtained.
The biochemical treatment mechanism 5 is connected with the resin adsorption tank 4, and is used for carrying out biochemical treatment on the wastewater after the resin adsorption treatment to remove organic matters in the wastewater, and comprises a hydrolysis tank 51, an aerobic tank 52, a second sedimentation tank 53 and a transition tank 54, wherein the hydrolysis tank 51 is connected with the resin adsorption tank 4, and microorganisms are arranged in the hydrolysis tank and can be used for degrading compounds in the wastewater after the resin adsorption treatment; the aerobic tank 52 is connected with the hydrolysis tank 51, and organic matters in the wastewater treated by the hydrolysis tank 51 are removed; the second sedimentation tank 53 is connected with the aerobic tank 52, and the wastewater treated by the aerobic tank 52 is subjected to sedimentation treatment again to obtain wastewater which can be discharged; the transition tank 54 is arranged between the hydrolysis tank 51 and the resin adsorption tank 4 and is used for adjusting the pH of the wastewater entering the hydrolysis tank 51, and the pH of the wastewater entering the hydrolysis tank 51 is adjusted to 7.5-8.5 through the transition tank 54 so as to ensure the normal biochemical operation after the wastewater.
The method for treating the low-concentration chromium-containing leather wastewater based on the treatment device specifically comprises the following steps of:
step one, collecting low-concentration chromium-containing leather wastewater, sending the low-concentration chromium-containing leather wastewater into an adjusting tank 1, adjusting the pH of the leather wastewater to 10-12, and then sending the leather wastewater into a membrane separator 2 for precipitation separation to obtain concentrated solution and waste liquid of leather-containing waste;
step two, delivering the waste liquid obtained in the step one into a resin adsorption tank 4, and adsorbing and recovering chromium ions in the waste liquid;
step three, the concentrated solution obtained in the step one is sent into a hydrolysis fermentation tank 31, and the oxygen concentration of the hydrolysis fermentation tank 31 is controlled to be lower than 0.1mg/L, so that the concentrated solution containing leather waste is subjected to hydrolysis fermentation, and protein in the leather waste is hydrolyzed; when the concentration of the concentrated solution is reduced to 7.5-8.5, the concentrated solution is sent into an anaerobic tower 32 to further decompose substances generated in the hydrolysis fermentation process;
step four, the concentrated solution processed by the anaerobic tower 32 is sent into a multi-medium filter 33 for filtering treatment, and the supernatant obtained by filtering is sent into a resin adsorption tank 4 for adsorbing and recovering chromium ions in the supernatant; the waste obtained by backwashing the multi-medium filter 33 is conveyed to the regulating tank 1 for reprocessing;
step five, the pH value of the wastewater treated by the resin adsorption tank 4 is regulated to 7.5-8.5, then the wastewater is sent into a hydrolysis tank 51 to degrade compounds in the wastewater, then the wastewater is sent into an aerobic tank 52 to remove organic matters in the wastewater, and then precipitation treatment is carried out to obtain the wastewater which can be discharged;
and step six, carrying out desorption treatment on the resin adsorption tank 4 subjected to the adsorption treatment, collecting desorption waste liquid, then adjusting the pH value of the desorption waste liquid to 4-5, and precipitating chromium ions in the desorption liquid to obtain a chromium precipitation recovery product.
According to the treatment device and the treatment method for the low-concentration chromium-containing leather wastewater, not only is chromium ions in the leather wastewater recovered, but also leather waste in the leather wastewater is subjected to reduction treatment, and the chromium ions in the leather waste are recovered in one step, so that potential pollution caused by chromium metal discharge is reduced to the greatest extent; wherein, the concentration of the leather wastewater entering the membrane separator 2 is regulated, so that the concentrated solution entering the hydrolysis fermentation tank 31 is treated under the conditions of strong alkali and anaerobism, and the protein in the leather waste is hydrolyzed, thereby effectively reducing the volume of floccules in the concentrated solution; and then the subsequent treatment of the anaerobic tower 32 is matched to realize the reduction treatment of leather waste in the leather wastewater.
Specifically limiting the structure of the biochemical treatment mechanism 5, firstly adjusting the pH of the wastewater treated by the resin adsorption tank 4, and then carrying out biochemical treatment by matching with the hydrolysis tank 51 and the aerobic tank 52 to remove organic matters in the wastewater; the hydrolysis tank 51 breaks the structure of the organic compound by the action of the microorganism, converts the macromolecules into micromolecular substances, further improves the biodegradability of the wastewater, and facilitates the aerobic action of the microorganism in the aerobic tank 52 so as to effectively reduce the COD concentration of the wastewater and obtain the wastewater meeting the discharge requirement.
The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, i.e., the utility model is not to be limited to the details of the claims and the description, but rather is to cover all modifications which are within the scope of the utility model.
Claims (9)
1. A treatment device for low-concentration chromium-containing leather wastewater is characterized in that: comprises an adjusting tank, a membrane separator, a resin adsorption tank, a leather waste treatment mechanism, a biochemical treatment mechanism and a chromium recovery mechanism;
the regulating tank is used for regulating the pH value of the imported low-concentration chromium-containing leather wastewater;
the membrane separator is connected with the regulating tank and is used for carrying out membrane concentration, precipitation and separation on the low-concentration chromium-containing leather wastewater to obtain concentrated solution and waste liquid of leather-containing waste;
the resin adsorption tank is connected with the membrane separator and is used for adsorbing and recovering chromium ions in the entered waste liquid;
the leather waste treatment mechanism is connected with the membrane separator, receives the concentrated solution containing the leather waste, and carries out reduction treatment on the leather waste;
the biochemical treatment mechanism is connected with the resin adsorption tank and is used for carrying out biochemical treatment on the wastewater after the resin adsorption treatment so as to remove organic matters in the wastewater;
the chromium recovery mechanism is connected with the resin adsorption tank and comprises a desorption liquid storage tank for carrying out desorption treatment on the resin adsorption tank and a first sedimentation tank which is connected with the resin adsorption tank for collecting desorption waste liquid and carrying out sedimentation treatment.
2. The treatment device for low-concentration chromium-containing leather wastewater according to claim 1, wherein: the leather waste treatment mechanism comprises a hydrolysis fermentation tank, an anaerobic tower and a multi-medium filter, wherein the hydrolysis fermentation tank is connected with the membrane separator and used for carrying out hydrolysis fermentation treatment on the leather waste concentrated solution, the anaerobic tower is connected with the hydrolysis fermentation tank and used for decomposing substances generated in the hydrolysis fermentation tank, and the multi-medium filter is connected with the anaerobic tower and used for carrying out filtration treatment on the concentrated solution coming out of the anaerobic tower.
3. The treatment device for low-concentration chromium-containing leather wastewater according to claim 2, wherein: the leather waste treatment mechanism further comprises a first conveying pipe, one end of the first conveying pipe is connected with the multi-medium filter, the other end of the first conveying pipe is connected with the resin adsorption tank, and supernatant obtained through treatment of the multi-medium filter is conveyed into the resin adsorption tank through the first conveying pipe.
4. The treatment device for low-concentration chromium-containing leather wastewater according to claim 2, wherein: the leather waste treatment mechanism further comprises a second conveying pipe, one end of the second conveying pipe is connected with the multi-medium filter, the other end of the second conveying pipe is connected with the regulating tank, and waste obtained by treatment of the multi-medium filter is conveyed into the regulating tank through the second conveying pipe.
5. The treatment device for low-concentration chromium-containing leather wastewater according to claim 1, wherein: the biochemical treatment mechanism comprises a hydrolysis tank, an aerobic tank and a second sedimentation tank, wherein the hydrolysis tank is connected with the resin adsorption tank and used for degrading compounds in wastewater after resin adsorption treatment; the aerobic tank is connected with the hydrolysis tank, so that organic matters in the wastewater treated by the hydrolysis tank are further removed; the second sedimentation tank is connected with the aerobic tank, and the wastewater treated by the aerobic tank is subjected to sedimentation treatment again so as to obtain the wastewater which can be discharged.
6. The treatment device for low-concentration chromium-containing leather wastewater according to claim 5, wherein: the biochemical treatment mechanism also comprises a transition tank which is connected between the hydrolysis tank and the resin adsorption tank and is used for adjusting the pH value of the wastewater entering the hydrolysis tank.
7. The treatment device for low-concentration chromium-containing leather wastewater according to claim 1, wherein: the desorption liquid storage tank comprises a first liquid storage tank for storing hydrochloric acid concentrated solution with the concentration of 3-4% and a second liquid storage tank for storing sodium hydroxide solution with the concentration of 4-5%.
8. The treatment device for low-concentration chromium-containing leather wastewater according to claim 1, wherein: the membrane separator adopts a ceramic membrane, the aperture of the ceramic membrane is 150-250 micrometers, and the concentration multiple is 10-20 times.
9. The treatment device for low-concentration chromium-containing leather wastewater according to claim 2, wherein: the anaerobic tower is an EGSB anaerobic tower or an IC anaerobic tower.
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| CN202223264107.6U CN219217770U (en) | 2022-12-06 | 2022-12-06 | Treatment device for low-concentration chromium-containing leather wastewater |
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| CN202223264107.6U CN219217770U (en) | 2022-12-06 | 2022-12-06 | Treatment device for low-concentration chromium-containing leather wastewater |
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