CN111547957A - Biological desulfurization device and method for leather unhairing wastewater - Google Patents
Biological desulfurization device and method for leather unhairing wastewater Download PDFInfo
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- CN111547957A CN111547957A CN202010451508.9A CN202010451508A CN111547957A CN 111547957 A CN111547957 A CN 111547957A CN 202010451508 A CN202010451508 A CN 202010451508A CN 111547957 A CN111547957 A CN 111547957A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 70
- 239000010985 leather Substances 0.000 title claims abstract description 29
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 21
- 230000023556 desulfurization Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000010802 sludge Substances 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 230000020477 pH reduction Effects 0.000 claims abstract description 45
- 230000007062 hydrolysis Effects 0.000 claims abstract description 43
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 43
- 238000004062 sedimentation Methods 0.000 claims abstract description 40
- 230000003647 oxidation Effects 0.000 claims abstract description 30
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 30
- 238000005273 aeration Methods 0.000 claims abstract description 11
- 238000010907 mechanical stirring Methods 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000011593 sulfur Substances 0.000 claims description 10
- 239000006228 supernatant Substances 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000005842 biochemical reaction Methods 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims 2
- 230000003301 hydrolyzing effect Effects 0.000 claims 2
- 230000035617 depilation Effects 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 abstract description 8
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 6
- 230000002779 inactivation Effects 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 3
- 230000019086 sulfide ion homeostasis Effects 0.000 abstract description 3
- 230000035484 reaction time Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- -1 sulfur ions Chemical class 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 150000002505 iron Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium chloride Substances Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 229910000357 manganese(II) sulfate Inorganic materials 0.000 description 1
- 239000002068 microbial inoculum Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011268 retreatment Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
Abstract
The invention discloses a biological desulfurization device and a biological desulfurization method for leather unhairing wastewater, relates to the technical field of wastewater treatment, and aims to solve the technical problems of high cost, much solid waste, hydrogen sulfide generation and sludge inactivation existing in a leather unhairing wastewater treatment method in the prior art, wherein the technical scheme of the invention is as follows: comprises a hydrolysis acidification tank, a biological oxidation tank, a sedimentation tank and a water collecting tank; the hydrolysis acidification tank is provided with a wastewater inlet and a first exhaust port, and a mechanical stirring device is arranged inside the hydrolysis acidification tank; the biological oxidation tank is provided with a second exhaust port, and an aeration device is arranged in the biological oxidation tank; the sedimentation tank is provided with a sludge outlet; the water collecting tank is provided with a water outlet; the hydrolysis acidification tank, the biological oxidation tank, the sedimentation tank and the water collecting tank are sequentially connected through water holes.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a biological desulfurization device and method for leather unhairing wastewater.
Background
The leather unhairing wastewater accounts for 10 percent of the total amount of the leather wastewater, and a large amount of pollutants such as alkaline compounds, sulfides, suspended matters, hairs, proteins and the like exist in the wastewater. Waste water S2-High pollution load (S)2-Concentration is more than or equal to 500mg/L), high toxicity and higher pH value (pH value is 11-13). And produces an unpleasant odor, which is a great harm to the environment.
The common treatment mode of the existing leather unhairing wastewater is mainly as follows: ferric salt settling method, chemical coagulation method, catalytic oxidation method. The iron salt precipitation method requires the addition of a large amount of iron salt (FeSO)4Or FeCl3) The method has large amount of black sludge and difficult treatment; the chemical coagulation method is to add basic AlCl3The coagulant is a flocculant formed by suspended matters and colloid in the wastewater, and then precipitation or air flotation separation is carried out, the treatment effect of the method often cannot reach the expected standard, and medicament cost is generated and further retreatment is needed, so that the operation cost is increased; the catalytic oxidation method is a mature technology and takes MnSO4The catalyst is oxidized by air to achieve harmless treatment, but the method requires the pH to be performed under a neutral condition, so that hydrogen sulfide gas is generated in the reaction process, and pollution is caused.
S due to leather dehairing waste water2-Higher contents and higher alkalinity, and the direct biological treatment of the wastewater or the treatment of the sulfides therein presents a lot of difficulties because of S2-Higher levels can reduce the settling properties of the activated sludge and produce toxic effects on microorganisms, which in turn can result in sludge deactivation.
In conclusion, the treatment method for the leather unhairing wastewater in the prior art has the defects of high cost, more solid wastes, hydrogen sulfide generation, sludge inactivation and the like.
Disclosure of Invention
In order to solve the technical problems of high cost, much solid waste, hydrogen sulfide generation and sludge inactivation existing in the leather unhairing wastewater treatment method in the prior art, the technical scheme of the invention is as follows:
the biological desulfurization device for the leather unhairing wastewater comprises a hydrolysis acidification tank, a biological oxidation tank, a sedimentation tank and a water collecting tank; the hydrolysis acidification tank is provided with a wastewater inlet and a first exhaust port, and a mechanical stirring device is arranged inside the hydrolysis acidification tank; the biological oxidation tank is provided with a second exhaust port, and an aeration device is arranged in the biological oxidation tank; the sedimentation tank is provided with a sludge outlet; the water collecting tank is provided with a water outlet; the hydrolysis acidification tank, the biological oxidation tank, the sedimentation tank and the water collecting tank are sequentially connected through water holes.
Furthermore, a sludge feeding hole is formed in the hydrolysis acidification tank, the sludge feeding hole is connected with the sludge outlet through a sludge pump, and a sludge discharge hole is formed in a connecting pipeline between the sludge feeding hole and the sludge outlet.
Further, the water hole mouth department of crossing that communicates biological oxidation pond in the sedimentation tank sets up the draft tube, and waste water is followed biological oxidation pond flows out, through the bottom that the draft tube got into the sedimentation tank.
Furthermore, a backflow water outlet is formed in the water collecting tank, a backflow water inlet is formed in the position of the wastewater inlet of the hydrolysis acidification tank in a penetrating mode, and the backflow water outlet is connected with the backflow water inlet through a backflow water pump.
Further, the bottom of the sedimentation tank is a conical tank bottom.
Furthermore, the water passing holes are of a single-hole structure or a porous structure, and can be set to be porous and uniformly distributed according to the water quantity.
The invention also provides a biological desulfurization method of the leather unhairing wastewater, which comprises the following steps:
mixing the pretreated sulfur-containing wastewater with the biochemically treated refluxed sulfur-containing wastewater, controlling the pH value to be less than or equal to 10, and simultaneously controlling the S2-The concentration is less than or equal to 500 mg/L;
step two, at the temperature of 15-35 ℃, the wastewater enters a hydrolysis acidification pool, part of Ca (OH)2 is removed through the sludge adsorption effect, and the pH value of the wastewater is continuously reduced by the hydrolysis acidification effect;
step three, after the step two is finished, the sewage enters a biological oxidation pond, and a certain amount of activated sludge containing S is added at the temperature of 15-35 DEG C2-The wastewater is subjected to biochemical reaction under the aeration condition to obtain S2-Conversion to SO4 2-Discharging the reaction product into a subsequent sedimentation tank after the reaction is finished for solid-liquid separation;
step four, after the step three is finished, the supernatant enters a water collecting tank, part of the supernatant is discharged to a subsequent system, and part of the supernatant is recycled to the front end of the hydrolysis acidification tank for diluting S2-And (4) concentration.
Further, the step one also comprises the following steps before:
during pretreatment, after the tannery unhairing wastewater is treated by a screen filter and a primary sedimentation tank, the pH value is adjusted to be less than or equal to 10, the temperature is 15-25 ℃, and S2-The concentration was 800 mg/L.
Further, in the third step, the activated sludge is municipal sludge or industrial biochemical sludge, a desulfurization microbial inoculum is required to be added for culture and acclimatization at the initial operation stage, the input amount of the activated sludge is 3000-4500mg/L, and the dissolved oxygen is controlled at 2-3mg/L during aeration.
And further, in the third step, the separated sludge is discharged through a sludge discharge port or recycled to a hydrolysis acidification tank for reuse.
Compared with the prior art, the biological desulfurization device and the method for the leather unhairing wastewater have the beneficial effects that:
1. the invention is suitable for S2-The concentration is high, the high alkalinity is resistant, the alkalinity is not adjusted, pollutants such as sulfur ions and the like in the leather unhairing wastewater are effectively removed, and the protein dissolved in the wastewater is directly consumed as the microorganism nutrition in the operation without adding an external carbon source.
2. The whole reaction process does not generate hydrogen sulfide gas under alkaline conditions.
3. No need of adding chemicals and no generation of chemical sludge, simple process operation, low investment, convenient management and operation, low operation cost and easy popularization.
Drawings
FIG. 1 is a schematic view of a biological desulfurization apparatus for unhairing waste water of leather in accordance with the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the biological desulfurization device for the leather unhairing wastewater comprises a hydrolysis acidification tank 1, a biological oxidation tank 2, a sedimentation tank 3 and a water collecting tank 4 which are sequentially communicated. The hydrolysis acidification tank 1 is provided with a wastewater water inlet 1-1 and a first exhaust port 10, a mechanical stirring device 5 is arranged inside the hydrolysis acidification tank, the biological oxidation tank 2 is provided with a second exhaust port 11, an aeration device 7 is arranged inside the biological oxidation tank, the sedimentation tank 3 is provided with a sludge outlet 16, the water collecting tank 4 is provided with a water outlet 1-3, and the hydrolysis acidification tank 1, the biological oxidation tank 2, the sedimentation tank 3 and the water collecting tank 4 are sequentially connected through water passing holes. Mixing the pretreated sulfur-containing wastewater with dilution water, pumping into a hydrolysis acidification tank 1, pre-filling sludge into the hydrolysis acidification tank 1, starting a mechanical stirring device 5 to make the wastewater fully contact with the sludge, and removing part of Ca (OH) through sludge adsorption2After the reaction, the wastewater enters a biological oxidation tank 2 through a first water through hole 6, activated sludge is pre-filled in the biological oxidation tank 2, acts on the wastewater through an aeration device 7 to improve the concentration of dissolved oxygen, and the sulfur-containing wastewater is subjected to biochemical desulfurization reaction to obtain S2-Conversion to SO4 2-And after the reaction is finished, the wastewater is discharged into a subsequent sedimentation tank 3 through a second water passing hole 8 for solid-liquid separation, and the separated wastewater enters a water collecting tank 4 through a third water passing hole 9 and enters a comprehensive wastewater treatment plant through a water outlet 1-3.
In order to improve the utilization rate of materials, a sludge feeding hole 1-2 is formed in the hydrolysis acidification tank 1, a sludge outlet 16 of the sedimentation tank 3 is connected with the sludge feeding hole 1-2 through a sludge pump 13 system, and the sludge pump 13 system comprises a pump and a pipeline. The design can improve the material utilization rate of the device, regularly reflows the sludge in the sedimentation tank 3 to the hydrolysis acidification tank 1 for adsorbing and removing Ca (OH) in the wastewater2. A sludge discharge port 12 is also arranged on a connecting pipeline between the sludge feeding port 1-2 and the sludge outlet 16, and the sludge discharge port 12 is used for connecting a sludge treatment system and discharging the sludge in the sedimentation tank 3 or the hydrolysis acidification tank 1 to the sludge treatment system.
The water hole mouth department of crossing of 3 in-connection in sedimentation tanks 2 sets up draft tube 15, and the second is crossed the water hole 8 and is set up draft tube 15 promptly, and waste water flows out from biological oxidation tank 2, through the bottom that draft tube 15 got into sedimentation tank 3, and draft tube 15 can prevent to cause the torrent when waste water gets into sedimentation tank 3, leads to the sedimentation effect to weaken.
The water collecting tank 4 is also provided with a return water outlet 17, a return water inlet 18 is also communicated with a waste water inlet 1-1 of the hydrolysis acidification tank 1, the return water outlet 17 is connected with the return water inlet 18 through a return water pump 14, and S of water inlet of the equipment2-The concentration can be diluted by biochemical effluent to realize the purpose of water saving, and the excess water is discharged into a comprehensive wastewater treatment plant.
The bottom of the sedimentation tank 3 is a conical tank bottom, and the tank type is determined according to the water quantity condition.
The invention also provides a biological desulfurization method for the leather unhairing wastewater, which comprises the following specific steps:
example 1
Step one, after a certain tanning unhairing waste liquid is treated by a screen filter and a primary sedimentation tank 3, the pH value is adjusted to 10, the measuring temperature is 25 ℃, and S2-The concentration is 800 mg/L; step two, lifting the sewage into a hydrolysis acidification tank 1, introducing part of clear water (introducing the flow value of only 2 hours), fully mixing the sewage in the hydrolysis acidification tank 1 by a mechanical stirring device 5, and measuring S2-The concentration is 496mg/L, the hydrolysis acidification reaction time is 1.5 hours, and the effluent enters the biological oxidation tank 2 through the water through holes; step three, controlling the dissolved oxygen concentration to be 2.6mg/L, the sludge concentration to be 3.60g/L and the reaction time to be 2 hours by aeration and continuous aeration to ensure that S in the wastewater is2-Converting sodium sulfide into sulfate ions (sodium sulfate), introducing effluent into a sedimentation tank 3 through a water hole, and measuring S in supernate2-The sludge in the sedimentation tank 3 periodically returns to the hydrolysis acidification tank 1 through a sludge pump 13, and the residual sludge is discharged to a sludge treatment system, wherein the sludge is 9.7 mg/L; and step four, the effluent is refluxed to the front section of the hydrolysis acidification tank 1 through a reflux water pump 14 for diluting the sulfur ions, and the residual effluent is discharged into a comprehensive wastewater treatment plant.
Example 2
Step one, pretreating certain leather unhairing liming waste water, adjusting the pH value to 10, and measuring the temperature to15 degree, S2-The concentration is 1090 mg/L; step two, mixing the waste water with the reuse water (the flow is only 3-4 hours of the time flow) of the enterprise, then lifting the mixture into a hydrolysis acidification tank 1, fully mixing the mixture through a mechanical stirring device 5, and measuring S2-The concentration is 496mg/L, the hydrolysis acidification reaction time is 2.5 hours, and the effluent enters the biological oxidation tank 2 through the water through holes; step three, controlling the concentration of dissolved oxygen to be 2.5mg/L, the concentration of sludge to be 3.50g/L and the reaction time to be 3.0 hours by continuously aerating through an aerating device 7, so that S in the wastewater is obtained2-Sodium sulfide is converted into sulfate ions (sodium sulfate), effluent enters a sedimentation tank 3 through a water through hole and flows into a guide cylinder 15, and S is measured by supernatant2-9.7mg/L, returning the sludge in the sedimentation tank 3 to a sludge feeding port 1-2 through a sludge pump 13, and discharging the residual sludge through a sludge outlet 16; and step four, the effluent automatically flows into a water collecting tank 4 at the rear section of the sedimentation tank 3, and flows back to the front section of the hydrolysis acidification tank 1 through a reflux water pump 14 for diluting the sulfur ions, and the residual effluent is discharged into a comprehensive wastewater treatment plant. The first exhaust port 10 and the second exhaust port 11 do not generate hydrogen sulfide gas in the overall reaction process.
Example 3
Step one, treating the liming and deliming waste water of a certain tannery by a grating and primary sedimentation, adjusting the pH value to 9.8, measuring the temperature to 20 ℃, and measuring the temperature S2-The concentration is 960 mg/L; step two, the wastewater is mixed with the reuse water of enterprises and then is lifted into a hydrolysis acidification tank 1, and S is measured after the wastewater is fully mixed by a mechanical stirring device 52-The concentration is 460mg/L, the hydrolysis acidification reaction time is 1.8 hours, and the effluent enters the biological oxidation tank 2 through the water through holes; step three, controlling the concentration of dissolved oxygen to be 2.4mg/L, the concentration of sludge to be 3.30g/L and the reaction time to be 2.5 hours by continuously aerating through an aerating device 7, so that S in the wastewater is obtained2-Converting sodium sulfide into sulfate ions (sodium sulfate), introducing effluent into a sedimentation tank 3 through a water hole, and measuring S in supernate2-8.5 mg/L; and step four, enabling the effluent to automatically flow into a middle water tank at the rear section of the primary sedimentation tank to flow back and then lift to the front section of the hydrolysis acidification tank 1 for diluting the sulfur ions.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A biological desulfurization device for leather unhairing wastewater is characterized by comprising a hydrolysis acidification tank, a biological oxidation tank, a sedimentation tank and a water collecting tank; the hydrolysis acidification tank is provided with a wastewater inlet and a first exhaust port, and a mechanical stirring device is arranged inside the hydrolysis acidification tank; the biological oxidation tank is provided with a second exhaust port, and an aeration device is arranged in the biological oxidation tank; the sedimentation tank is provided with a sludge outlet; the water collecting tank is provided with a water outlet; the hydrolysis acidification tank, the biological oxidation tank, the sedimentation tank and the water collecting tank are sequentially connected through water holes.
2. The biological desulfurization device for the unhairing wastewater of leather as claimed in claim 1, wherein the hydrolysis acidification tank is provided with a sludge inlet, the sludge inlet is connected with the sludge outlet through a sludge pump, and a connecting pipeline between the sludge inlet and the sludge outlet is further provided with a sludge discharge port.
3. The biological desulfurization device for the unhairing wastewater of leather as claimed in claim 2, wherein a guide cylinder is arranged at the hole of the water through hole communicated with the biological oxidation tank in the sedimentation tank, and the wastewater flows out of the biological oxidation tank and enters the bottom of the sedimentation tank through the guide cylinder.
4. The biological desulfurization device for the unhairing wastewater of leather as claimed in claim 3, wherein the water collecting tank is further provided with a return water outlet, the wastewater inlet of the hydrolysis acidification tank is further provided with a return water inlet, and the return water outlet is connected with the return water inlet through a return water pump.
5. The biological desulfurization device for leather unhairing wastewater as claimed in claim 4, wherein the bottom of the sedimentation tank is a conical tank bottom.
6. The biological desulfurization device for leather unhairing wastewater as claimed in claim 5, wherein the water passing holes are of a single-hole structure or a porous structure.
7. A biological desulfurization method for leather unhairing wastewater is characterized by comprising the following steps:
mixing the pretreated sulfur-containing wastewater with the biochemically treated refluxed sulfur-containing wastewater, controlling the pH value to be less than or equal to 10, and simultaneously controlling the S2-The concentration is less than or equal to 500 mg/L;
step two, at the temperature of 15-35 ℃, the wastewater enters a hydrolytic acidification tank, and partial Ca (OH) is removed through the sludge adsorption2Continuously reducing the pH value of the wastewater by hydrolysis acidification;
step three, after the step two is finished, the sewage enters a biological oxidation pond, and a certain amount of activated sludge containing S is added at the temperature of 15-35 DEG C2-The wastewater is subjected to biochemical reaction under the aeration condition to obtain S2-Conversion to SO4 2-Discharging the reaction product into a subsequent sedimentation tank after the reaction is finished for solid-liquid separation;
step four, after the step three is finished, the supernatant enters a water collecting tank, part of the supernatant is discharged to a subsequent system, and part of the supernatant is recycled to the front end of the hydrolysis acidification tank for diluting S2-And (4) concentration.
8. The method for biologically desulfurizing leather depilation wastewater according to claim 7, wherein the first step further comprises the steps of:
during pretreatment, after the tannery unhairing wastewater is treated by a screen filter and a primary sedimentation tank, the pH value is adjusted to be less than or equal to 10, the temperature is 15-25 ℃, and S2-The concentration was 800 mg/L.
9. The method for biologically desulfurizing leather unhairing wastewater as claimed in claim 7, wherein in the third step, the activated sludge is municipal sludge or industrial biochemical sludge, the input amount of the activated sludge is 3000-4500mg/L, and the dissolved oxygen is controlled to be 2-3mg/L during aeration.
10. The biological desulfurization method for leather unhairing wastewater as claimed in claim 7, wherein in the third step, the separated sludge is discharged through a sludge discharge port or recycled into a hydrolytic acidification tank for reuse.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103663865A (en) * | 2013-11-27 | 2014-03-26 | 湖州织里童装发展有限公司 | Leather wastewater treatment process |
| CN104445837A (en) * | 2014-12-25 | 2015-03-25 | 北京桑德环境工程有限公司 | Industrial combined wastewater bio-augmentation treatment system and method |
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| CN108285248A (en) * | 2018-04-12 | 2018-07-17 | 西安优瑞卡环保科技有限公司 | A kind of leather-making waste water treatment method based on mud decrement |
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2020
- 2020-05-25 CN CN202010451508.9A patent/CN111547957A/en active Pending
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| CN103663865A (en) * | 2013-11-27 | 2014-03-26 | 湖州织里童装发展有限公司 | Leather wastewater treatment process |
| CN204281512U (en) * | 2014-11-28 | 2015-04-22 | 天津聚雅源科技有限公司 | System for leather-making waste water is handled in catalytic oxidation desulfurization |
| CN104478166A (en) * | 2014-12-10 | 2015-04-01 | 重庆隆发皮革制品有限责任公司 | Treatment process and treatment system of sulfide-containing wastewater in leather wastewater |
| CN104445837A (en) * | 2014-12-25 | 2015-03-25 | 北京桑德环境工程有限公司 | Industrial combined wastewater bio-augmentation treatment system and method |
| CN108285248A (en) * | 2018-04-12 | 2018-07-17 | 西安优瑞卡环保科技有限公司 | A kind of leather-making waste water treatment method based on mud decrement |
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Application publication date: 20200818 |