CN215517101U - Tannery effluent disposal system - Google Patents
Tannery effluent disposal system Download PDFInfo
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- CN215517101U CN215517101U CN202122215228.0U CN202122215228U CN215517101U CN 215517101 U CN215517101 U CN 215517101U CN 202122215228 U CN202122215228 U CN 202122215228U CN 215517101 U CN215517101 U CN 215517101U
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Abstract
The utility model belongs to the technical field of tannery wastewater treatment, and particularly relates to a tannery wastewater treatment system.A aeration system is arranged at the middle part of a primary double-layer mixed treatment tank and a secondary double-layer mixed treatment tank, so that an aerobic zone and an anoxic zone are formed in the same mixed treatment tank from top to bottom, different microorganism groups are formed, and different types of organic matters can be decomposed; an aeration system of the first-stage double-layer mixing treatment tank is connected with an ozone generator, and part of zoogloea can be disintegrated by regularly adding ozone, so that the sludge production and odor are reduced; the secondary double-layer mixed treatment tank is arranged to further decompose the residual organic matters in the sewage, so that the purpose of graded treatment is achieved.
Description
Technical Field
The utility model belongs to the technical field of tannery wastewater treatment, and particularly relates to a tannery wastewater treatment system.
Background
At present, leather-making industrial production generally comprises several working sections of degreasing, liming unhairing, softening, tanning, dyeing processing, drying, finishing and the like, and various chemicals are required to be added in the processing process, so that the wastewater contains various pollutants and toxic substances such as grease, collagen, animal and plant fibers, organic and inorganic solid matters, sulfides, chromium, salts, surfactants, dyes and the like; the waste water has a strong odor due to the decomposition of sulfides and proteins in the water.
Chinese patent document CN203269731U (CN201320297422.0) discloses a leather wastewater treatment apparatus, which includes: a reaction tank, at least one sludge filter press, at least one grid, a regulating tank, an air flotation tank, a sludge tank, an anoxic tank, an aerobic tank, a sedimentation tank and the like. The chromium-containing wastewater enters a reaction tank for reaction to remove chromium, so that the chromium is prevented from being harmful to microorganisms in an aerobic tank and an anoxic tank, the rest wastewater is subjected to impurity removal through a grating, and then water quality regulation, air flotation, anoxic and aerobic treatment are respectively carried out. After the treatment, the wastewater can reach the national discharge standard.
However, the aerobic tank and the anoxic tank are separately arranged in the scheme, so that the space is occupied, and sulfides are mainly generated in the anoxic tank and still generate large odor to pollute the air.
In addition, because the salt content of the tannery wastewater is high, a large amount of chemical agents are required to be added in the conventional sewage treatment to provide a carbon source, deodorize or chemically remove phosphorus, and the like, so that the salt content of the sewage is further increased, the biochemical reaction is not facilitated, and the cost of subsequent desalting is increased.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to form an aerobic zone and an anoxic zone from top to bottom in the same mixing treatment tank by arranging the aeration system at the middle part of the first-stage double-layer mixing treatment tank and the second-stage double-layer mixing treatment tank, so that different microbial communities are formed, organic matters of different types can be decomposed, the sewage treatment efficiency is accelerated, the anoxic zone is positioned at the bottommost layer of the mixing tank, the odor can be obviously reduced, the arrangement space of the treatment system is reduced, the residual organic matters in the sewage are further decomposed by arranging the second-stage double-layer mixing treatment tank, the purpose of graded treatment is achieved, and the organic matters in the sewage are fully decomposed.
The technical problem to be solved by the utility model is realized by adopting the following technical scheme: a tannery wastewater treatment system comprises a grid, an adjusting tank, a primary double-layer mixing treatment tank, a secondary double-layer mixing treatment tank, a sedimentation tank, a clean water tank, a sludge digestion tank and a sludge concentration tank, wherein the grid, the adjusting tank, the primary double-layer mixing treatment tank, the secondary double-layer mixing treatment tank, the sedimentation tank and the clean water tank are sequentially arranged in the water flow direction;
the sludge outlet of the sedimentation tank is connected with the inlet of the sludge digestion tank, and the sludge outlet of the sludge digestion tank is connected with the inlet of the sludge concentration tank;
the primary double-layer mixed treatment tank is divided into an aerobic zone and an anoxic zone by a first aeration system arranged in the middle, and the first aeration system is connected with an ozone generator; the secondary double-layer mixed treatment tank is divided into an aerobic zone and an anoxic zone by a second aeration system arranged in the middle;
the double-deck mixed treatment pond of one-level and the double-deck mixed treatment pond of second grade all follow the bottom and intake and go out water from the top, promptly the water inlet in the double-deck mixed treatment pond of one-level and the water inlet in the double-deck mixed treatment pond of second grade all are located respective oxygen deficiency district, the delivery port in the double-deck mixed treatment pond of one-level and the delivery port in the double-deck mixed treatment pond of second grade all are located respective good oxygen district, the oxygen deficiency district in the double-deck mixed treatment pond of one-level and the double-deck mixed treatment pond oxygen deficiency district of second grade all are provided with the impeller. The impeller strengthens the stirring function of the lower part of the tank, prevents sludge from settling and ensures that organic matters in the sewage are fully degraded.
The aerobic tank is a structure which maintains the dissolved oxygen content in water to be about 2-6mg/L through measures such as aeration and the like, is suitable for the growth and the propagation of aerobic microorganisms, and thus treats pollutants in the water; the anoxic pond is a structure which is suitable for living of aerobic and facultative microorganisms due to insufficient aeration or no aeration but low pollutant content, the facultative microorganisms can adapt to wastewater with high COD concentration, the COD concentration of inlet water can be increased to more than 2000mg/L, and the removal rate of COD is generally 50-80%; the aerobic microorganism can only be suitable for wastewater with lower COD concentration, the COD concentration of the inlet water is generally controlled below 1000-1500mg/L, and the COD removal rate is generally 50-80%. Different oxygen environments have different microbial communities, thereby achieving the purpose of treating sewage with different COD concentrations.
The utility model has the beneficial effects that: because the organic matters in the wastewater are influenced by gravity, the content of macromolecular organic matters in the mixing tank increases along with the increase of the depth, the oxygen solubility is smaller, the anoxic tank is suitable for decomposing the macromolecular organic matters, but odor gases such as hydrogen sulfide are easily generated, and an aeration system is arranged at the middle part of the primary double-layer mixing treatment tank and the secondary double-layer mixing treatment tank, so that an aerobic area and an anoxic area are formed in the same mixing treatment tank from top to bottom, different microorganism groups are formed, the organic matters with different structures can be decomposed, the ammonia nitrogen in the sewage is converted into nitrate nitrogen through nitrification in the aerobic area, and then the nitrate nitrogen is converted into nitrogen through denitrification in the anoxic area, and the sewage treatment efficiency is accelerated;
the anoxic zone is positioned at the bottommost layer of the mixing tank, so that the odor can be obviously reduced, the arrangement space of a treatment system is reduced, and the land resources are saved; when the floating sulfide passes through the aeration system, the ozone provided by the aeration system can react with the sulfide in the water to further remove odor, and chemicals or salt is not required to be added;
the zoogloea is the most main component of the activated sludge and has stronger capacity of adsorbing and oxidizing organic matters, an aeration system of the primary double-layer mixing treatment tank is connected with an ozone generator, part of the zoogloea can be disintegrated by regularly adding ozone, so that the sludge production is reduced, the ozone has stronger oxidizing capacity, high molecular organic matters can be converted into simple organisms in a low molecular form and even easy to digest, the biodegradability of organisms is improved, and favorable conditions are improved for aerobic biochemical treatment;
the secondary double-layer mixing treatment tank further decomposes the residual low-concentration organic matters in the sewage treated by the primary double-layer mixing treatment tank, so that the aim of grading treatment is fulfilled, and the organic matters in the sewage are fully degraded;
because the first-stage double-layer mixed treatment tank and the second-stage double-layer mixed treatment tank carry out two-stage biochemical treatment, the degradation effect is good, chemical agents are not used for pretreating the tannery wastewater, the wastewater treatment cost is obviously reduced, the salt content of the wastewater is effectively reduced, and the cost input of the later-stage desalting treatment is reduced;
because the decomposition efficiency of the anoxic zone is low, the circulating flow of the fluid in the anoxic zone is ensured by arranging the flow pushing device, and the degradation efficiency of the organic matters is accelerated.
The technical scheme of the utility model is as follows: the height of the primary double-layer mixed treatment tank body and the height of the secondary double-layer mixed treatment tank body are both 10-14 m. The height of a general biochemical pool is 5-7 meters, the pool depth is too shallow to meet the generation of an anoxic zone, a certain time is needed for the reaction of ozone and sulfide, and the height of the existing biochemical pool cannot meet the purpose of eliminating odor.
The technical scheme of the utility model is as follows: and the first aeration system and the second aeration system both adopt rotational flow aerators. The spiral-flow type aerator uses air to flow at a high speed, thereby driving sewage to flow, stirring and mixing are generated in a water tank, the maintenance is convenient, the tank does not need to be cleaned or the production is stopped, the installation can be carried out without stopping production, and the blockage is not easy.
Drawings
FIG. 1 is a schematic structural diagram of a tannery wastewater treatment system according to the present invention;
in the figure, 1 grid, 2 regulating tank, 3 first-stage double-layer mixing treatment tank, 31 first aeration system, 32 ozone generator;
4 a second-stage double-layer mixed treatment tank and 41 a second aeration system;
5, a sedimentation tank, 6 a clean water tank, 7 a sludge digestion tank, 8 a sludge concentration tank and 9 a flow impeller;
an aerobic zone A and an anoxic zone B.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the tannery wastewater treatment system comprises a grating 1, an adjusting tank 2, a first-stage double-layer mixed treatment tank 3, a second-stage double-layer mixed treatment tank 4, a sedimentation tank 5, a clean water tank 6, a sludge digestion tank 7 and a sludge concentration tank 8, wherein the grating 1, the adjusting tank 2, the first-stage double-layer mixed treatment tank 3, the second-stage double-layer mixed treatment tank 4, the sedimentation tank 5 and the clean water tank 6 are sequentially arranged in the water flow direction.
The sludge outlet of the sedimentation tank 5 is connected with the inlet of the sludge digestion tank 7, and the sludge outlet of the sludge digestion tank 7 is connected with the inlet of the sludge concentration tank 8.
The primary double-layer mixed treatment tank 3 is divided into an aerobic zone A and an anoxic zone B by a first aeration system 31 arranged in the middle, and the first aeration system 31 is connected with an ozone generator 32; the secondary double-layer mixing treatment tank 4 is divided into an aerobic zone A and an anoxic zone B by a second aeration system 41 arranged in the middle.
The one-level double-layer mixing treatment tank 3 and the second-level double-layer mixing treatment tank 4 are both fed with water from the bottom and discharged with water from the top, and the anoxic zone B of the one-level double-layer mixing treatment tank 3 and the anoxic zone B of the second-level double-layer mixing treatment tank 4 are both provided with a flow impeller 9.
The height of the tank body 3 of the first-stage double-layer mixing treatment tank and the height of the tank body 4 of the second-stage double-layer mixing treatment tank are both 12 meters.
The first aeration system 31 and the second aeration system 41 both adopt cyclone aerators.
The working principle is as follows: the sewage treated by the treatment system is the sewage after pretreatment of toxic substances, larger impurities such as broken skin, meat and hair and the like are intercepted through the grating 1, the pH value of the sewage is adjusted through the adjusting tank 2 to be the pH value suitable for the existence of microorganisms, and then the sewage is sent into the primary double-layer mixed treatment tank 3 for biochemical treatment, because the ozone generator 32 is arranged, the organic matters which are difficult to degrade are fully degraded into small molecular organic matters in the primary double-layer mixed treatment tank 3, sulfides which generate odor are effectively removed, the residual small molecular organic matters are further degraded through the secondary double-layer mixed treatment tank 4, the biochemical treatment effect is good, the generated active sludge amount is obviously reduced, therefore, only the sedimentation tank 5 is arranged at the downstream of the secondary double-layer mixed treatment tank 4, the cement separation can be met, the secondary sedimentation tank is cancelled, the floor area of the treatment system is reduced, and the cement separation is realized through the sedimentation tank 5, clear water on the upper layer is injected into a clear water tank 6, sludge on the bottom layer is injected into a sludge digestion tank 7, sludge generated in the sewage biochemical treatment process is raw sludge, the sludge is degraded by facultative microorganisms and obligate anaerobic microorganisms in the sludge digestion tank 7, organic components are converted into methane, the sludge is stable and becomes mature sludge which is easy to dehydrate and has no stink, the methane can be collected and utilized, the mature sludge is further discharged into a sludge concentration tank 8, and the mature sludge is used as a fertilizer after dehydration.
The double-deck mixed treatment pond of one-level 3 and the double-deck mixed treatment pond of second grade 4 all are provided with anoxic zone B and aerobic zone A, consequently accelerated degradation efficiency, because tannery waste water itself contains the salt height, because this processing system biochemical treatment is efficient, has reduced the interpolation of thing medicament, consequently effectively controlled the further improvement of salinity, has reduced the burden of later stage desalination system.
Claims (3)
1. A tannery effluent disposal system which characterized in that: the device comprises a grating (1), an adjusting tank (2), a primary double-layer mixing treatment tank (3), a secondary double-layer mixing treatment tank (4), a sedimentation tank (5), a clear water tank (6), a sludge digestion tank (7) and a sludge concentration tank (8), wherein the grating (1), the adjusting tank (2), the primary double-layer mixing treatment tank (3), the secondary double-layer mixing treatment tank (4), the sedimentation tank (5) and the clear water tank (6) are sequentially arranged in the water flow direction;
the sludge outlet of the sedimentation tank (5) is connected with the inlet of the sludge digestion tank (7), and the sludge outlet of the sludge digestion tank (7) is connected with the inlet of the sludge concentration tank (8);
the primary double-layer mixed treatment tank (3) is divided into an aerobic zone (A) and an anoxic zone (B) by a first aeration system (31) arranged in the middle, and the first aeration system (31) is connected with an ozone generator (32); the secondary double-layer mixed treatment tank (4) is divided into an aerobic zone (A) and an anoxic zone (B) by a second aeration system (41) arranged in the middle;
the one-level double-layer mixing treatment tank (3) and the second-level double-layer mixing treatment tank (4) are both fed with water from the bottom and discharged with water from the top, and an anoxic zone (B) of the one-level double-layer mixing treatment tank (3) and an anoxic zone (B) of the second-level double-layer mixing treatment tank (4) are both provided with a flow impeller (9).
2. The tannery wastewater treatment system according to claim 1, characterized in that: the height of the tank body of the first-stage double-layer mixed treatment tank (3) and the height of the tank body of the second-stage double-layer mixed treatment tank (4) are both 10-14 m.
3. The tannery wastewater treatment system according to claim 1 or 2, characterized in that: the first aeration system (31) and the second aeration system (41) both adopt cyclone aerators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122215228.0U CN215517101U (en) | 2021-09-13 | 2021-09-13 | Tannery effluent disposal system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122215228.0U CN215517101U (en) | 2021-09-13 | 2021-09-13 | Tannery effluent disposal system |
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| Publication Number | Publication Date |
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| CN215517101U true CN215517101U (en) | 2022-01-14 |
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| CN202122215228.0U Active CN215517101U (en) | 2021-09-13 | 2021-09-13 | Tannery effluent disposal system |
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