CN115626747A - System and method for deeply treating leather wastewater - Google Patents
System and method for deeply treating leather wastewater Download PDFInfo
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- CN115626747A CN115626747A CN202211442365.0A CN202211442365A CN115626747A CN 115626747 A CN115626747 A CN 115626747A CN 202211442365 A CN202211442365 A CN 202211442365A CN 115626747 A CN115626747 A CN 115626747A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 119
- 239000010985 leather Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 30
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 53
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 43
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- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
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- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 19
- 239000011574 phosphorus Substances 0.000 claims abstract description 19
- 238000012546 transfer Methods 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
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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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- 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
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention relates to a system and a method for deeply treating leather wastewater. The system comprises a filtering device, an ozone catalytic tower, an intermediate buffer tank, a rapid separation biological tank, a spore transfer device and a disinfection and sterilization tower which are connected in sequence. The method for deeply treating the leather wastewater has low treatment cost, can treat the leather wastewater with poor biodegradability and high nitrogen and phosphorus contents to reach the first-level A wastewater discharge standard, thereby solving the problems of poor chemical oxygen demand biodegradability, high nitrogen and phosphorus removal difficulty, high cost, large sludge amount and complex operation in the leather wastewater, and providing a new method for upgrading and deeply treating the leather wastewater.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to a system and a method for deeply treating leather wastewater.
Background
A large amount of high-pollution drainage with high COD, high ammonia nitrogen and high phosphorus can be generated in the leather processing and tanning processes, the sewage is generally treated by a biological method at present, the organic matter content of the treated sewage is still higher, the biodegradability is very low, the concentration of total phosphorus, ammonia nitrogen and total nitrogen is also very high, the chroma is high, and the water quality fluctuation is large.
The water quality treated by the traditional process can only meet the requirement of secondary emission limit in the discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-2002), so that the traditional process can not meet the requirement of wastewater discharge far when used for areas with high emission requirements or upgrading and reconstruction.
Therefore, the technical scheme of the invention is provided.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a system and a method for deeply treating leather wastewater. The method for deeply treating the leather wastewater combines an ozone method, a rapid biological treatment technology and a spore transfer technology, firstly utilizes ozone to improve the biodegradability of chemical oxygen demand in the wastewater, and ozone which does not participate in reaction escapes from the wastewater and then enters a terminal disinfection and sterilization tower to carry out sterilization treatment on the wastewater. The biodegradability of the wastewater treated by ozone is improved, and the chromaticity of the wastewater is reduced; then the wastewater enters an intermediate buffer tank, on one hand, residual ozone in the wastewater can be ensured to be fully escaped from the wastewater, on the other hand, some precipitates can be generated when the ozone oxidizes organic matters in the wastewater, and the precipitates are separated from the wastewater in the intermediate buffer tank; and then the wastewater enters a rapid decomposition biological pond to remove chemical oxygen demand and nitrogen in the wastewater, and then enters a spore transfer device to remove residual phosphorus in the wastewater, and the treated wastewater is mixed with ozone escaping from the front end to realize the purpose of wastewater sterilization in a disinfection and sterilization tower.
The scheme of the invention provides a system for deeply treating leather wastewater, which comprises a filtering device, an ozone catalytic tower, an intermediate buffer tank, a rapid separation biological tank, a spore transfer device and a disinfection and sterilization tower which are connected in sequence; wherein:
the filtering device is used for reducing the content of suspended matters in the leather wastewater;
the ozone catalytic tower is used for improving the biodegradability of organic matters in the leather wastewater;
the middle buffer pool is used for dissipating residual ozone in the leather wastewater and separating suspended matters generated in the ozone reaction process;
the rapid separation biological pond is used for reducing the content of organic matters, ammonia nitrogen and total nitrogen in the leather wastewater;
the spore transferring device is used for further reducing the content of total phosphorus, suspended matters and COD in the leather wastewater;
the disinfection and sterilization tower is used for disinfecting and sterilizing the leather wastewater and removing and decoloring organic matters in the leather wastewater.
Preferably, the filter device is a fiber rotary disc filter.
Preferably, the ozone catalysis tower is connected with the disinfection and sterilization tower through a first air pipeline; the middle buffer pool is connected with the disinfection and sterilization tower through a second air pipeline; wherein:
the first gas pipeline is used for conveying oxygen, ozone and water vapor generated in the ozone catalytic tower to the disinfection and sterilization tower;
the second air pipeline is used for conveying the residual ozone to the disinfection and sterilization tower.
Preferably, a heterogeneous ozone catalyst is arranged in the ozone catalytic tower.
Preferably, the middle buffer tank is provided with an inclined plate for sedimentation.
Preferably, the rapid separation biological pond adopts an O/A/O multi-stage biological treatment mode; wherein:
the first stage is a fast-separating aerobic tank, the second stage is a fast-separating anoxic tank, and the third stage is still a fast-separating aerobic tank.
Preferably, a spore generator and a spore voltage stabilizer are arranged in the spore transferring device; wherein:
the spore generator and the spore voltage stabilizer together provide micro-nano bubbles.
Based on the same technical concept, the invention also provides a method for advanced treatment of leather wastewater, which is characterized in that the leather wastewater is introduced into the filtering device and sequentially passes through an ozone catalytic tower, an intermediate buffer tank, a rapid separation biological tank, a spore transfer device and a disinfection and sterilization tower.
For the understanding of the present invention, the technical means of the present invention will be described in detail.
The leather wastewater contains certain solid suspended matters, and if the leather wastewater is not treated, the leather wastewater has certain influence on the following ozone process, so that the leather wastewater to be treated passes through the filtering device firstly for reducing the suspended matters in the wastewater to be below 5 mg/L.
The wastewater from which suspended matters are removed is mixed with ozone in a countercurrent way in an ozone catalytic tower, a heterogeneous ozone catalyst with the particle size of 3-6 mm is filled in the ozone catalytic tower, on one hand, the heterogeneous ozone catalyst can enable the ozone to generate hydroxyl radicals, so that macromolecular organic matters in the wastewater are broken by utilizing the strong oxidizing property of the hydroxyl radicals, and the biochemical property of the organic matters in the wastewater is improved; on the other hand, the retention time of the ozone in the ozone catalytic tower can be increased, and the utilization rate of the ozone is improved. The main function of this stage is to improve the biodegradability of the organic matter. The reacted gas (mainly oxygen, ozone and water vapor) is discharged from an exhaust pipe at the top end of the ozone catalytic tower and is guided into a disinfection and sterilization tower at the tail end of the system through a first gas pipeline so as to sterilize the wastewater.
The waste water after ozone treatment enters the intermediate buffer tank, and the ozone remained in the waste water is completely dissipated during the process, so that the residual ozone is prevented from entering the rapid decomposition biological tank to reduce the activity of microorganisms, and the escaped ozone is guided into the disinfection and sterilization tower at the tail end of the system through the second air pipeline to sterilize the waste water. If suspended matters are generated in the reaction process of the wastewater and the ozone, the inclined plate in the middle buffer tank can be utilized to carry out high-efficiency precipitation, so that the suspended matters and the wastewater in the wastewater are separated.
The wastewater passing through the intermediate buffer tank enters a rapid separation biological tank, and the removal of pollutants such as organic matters, ammonia nitrogen, total nitrogen and the like is realized under the action of microorganisms by adopting an O/A/O multi-stage biological treatment technology according to the characteristic of low carbon-nitrogen ratio of the leather wastewater. The first stage is a quick-separating aerobic tank, and the ammonia nitrogen in the wastewater is nitrified to fully convert the ammonia nitrogen into nitrate nitrogen; the second stage is a rapid-separation anoxic tank, the carbon-nitrogen ratio is maintained at 5 by adding a carbon source, and the stage is a denitrification reaction, and nitrate nitrogen in the wastewater is removed from the wastewater after being denitrified into nitrogen; the third stage is a fast-separating aerobic tank, which deeply removes the residual organic matters in the wastewater. The rapid separation biological pond is an efficient biological membrane treatment process, has the characteristic of a self-adaptive system, constructs a complete biological chain for overlong sludge age, is self-adaptive according to the change of water quality and water quantity in the space distribution of the biological chain in a variable environment, and has strong impact load capacity for resisting the water quality and the water quantity. The denitrification treatment of the leather wastewater is realized through the layout and the filling configuration of the rapid-decomposition biological balls, the collection and the discharge of nitrogen, the accurate carbon source addition, the control of an automatic back-flushing system and the like. Under the composite environment, the inside anaerobic bacteria degrade the biological sludge synthesized in the surface aerobic reaction, and the fallen low-activity biomembrane is enriched and degraded again under the action of the separation, so that the sludge yield is low. After the wastewater is treated by the rapid decomposition biological pond, except the total phosphorus concentration, the chemical oxygen demand, the total nitrogen and the ammonia nitrogen in the wastewater can all meet the first-level A discharge requirement of the wastewater.
After the wastewater enters the spore transferring device, phosphorus and dissolved organic matters are deeply removed: the introduced medicament and the micro-nano bubbles react with phosphorus and hydrophobic suspended matters in water, so that the method is an efficient physical and chemical treatment method, can quickly remove pollutants such as total phosphorus, suspended matters and COD (chemical oxygen demand) in water, and simultaneously realizes reoxygenation of water. The spore transferring device has the characteristics of small occupied area, integrated complete equipment, flexible modular combination form, short construction period and debugging period. The spore transfer device is characterized in that a spore generator and a spore voltage stabilizer provide micro-nano bubbles, the spore transfer device utilizes disturbance generated in the release process of the micro-nano bubbles by means of the huge specific surface area of the micro-nano bubbles, and a medicament reacts with dissolved-state and non-dissolved-state phosphorus, hydrophobic-group suspended matters and the like in water under the action of a hydraulic flow field to form a 'water-gas-solid three-phase mixture', most of the medicament floats to the water surface to form a scum layer under the synergistic action of the micro-nano bubbles, and the scum layer is automatically scraped to a deslagging tank through a slag scraper; and a small part of sediment forms a sediment layer at the bottom, is removed through a bottom suction dredge, and finally leads the sediment to a slag discharge groove. The phosphorus content in the treated wastewater can be controlled below 0.5mg/L, and the effluent quality meets the requirement of the first-class A standard emission limit in the pollution emission standard of urban sewage treatment plants (GB 18919-2002).
The waste water from the spore transferring device is fully mixed with ozone escaped from the front-end ozone catalytic tower and the middle buffer pool in the tail-end disinfection and sterilization tower, organic matters in the waste water are further removed and decolored by utilizing the strong oxidizing property of the ozone, the purpose of sterilization is achieved, and the stable standard of the water quality of the discharged water is ensured. Finally, the dissolved oxygen of the effluent approaches to a saturated state and can be stably maintained for a long time, the self-purification capacity of the water body of the receiving lake and the river can be improved, the in-situ reduction of the bottom mud is realized, and the ecological restoration capacity of the receiving water body is improved.
In conclusion, the process can realize the difficult problem that organic matters, total nitrogen, ammonia nitrogen and total phosphorus in leather wastewater cannot be deeply removed by the conventional method.
The invention has the beneficial effects that:
the method for deeply treating the leather wastewater has low treatment cost, can treat the leather wastewater with poor biodegradability and high nitrogen and phosphorus contents to reach the first-level A wastewater discharge standard, thereby solving the problems of poor chemical oxygen demand biodegradability, high nitrogen and phosphorus removal difficulty, high cost, large sludge amount and complex operation in the leather wastewater, and providing a new method for upgrading and deeply treating the leather wastewater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view showing the connection relationship of the system for advanced treatment of leather wastewater according to the present invention.
Fig. 2 is a schematic structural diagram of the spore transfer device according to the invention.
The reference numbers in the figures are:
1-a filtration device; 2-an ozone catalytic tower; 21-a first gas line; 3-a middle buffer pool; 31-a second air line; 4-a rapid separation biological pond; 5-a spore transfer device; a 51-spore generator; 52-spore potentiostat; 53-scum layer; 54-a slag scraper; 55-slag discharge groove; 56-settling mud layer; 57-suction dredge; 6-disinfection and sterilization tower.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1 and 2, the present embodiment provides a system for advanced treatment of leather wastewater, which comprises a filtering device 1, an ozone catalytic tower 2, an intermediate buffer tank 3, a rapid separation biological tank 4, a spore transferring device 5 and a disinfection and sterilization tower 6, which are connected in sequence. And the concrete working mode and implementation mode among all the devices are explained by taking the upgrading and transformation project of the sewage treatment plant in the leather park of certain economic development area of Heilongjiang as an example.
The water quality range of the leather wastewater to be treated is COD 100 to 150mg/L and BOD 5 10 to 15mg/L, ammonia Nitrogen (NH) 3 -N) 30 to 35mg/L, total Nitrogen (TN) 65 to 75mg/L, total Phosphorus (TP) 0.6 to 0.8mg/L, SS 40 to 50mg/L, and turbidity 35 to 40NTUAnd the chroma is 100 to 200 times, so that the water quality has the characteristics of low B/C, low C/N, high total nitrogen load, high chroma and the like.
The effluent quality target is the primary A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 18918-2002), and is shown in Table 1.
TABLE 1 pollutant discharge Standard of urban Sewage treatment plant
According to the water quality condition and the expected target, the process route for deeply treating the leather wastewater is designed as follows: fiber rotary disc filter → ozone catalytic oxidation → inclined plate sedimentation → rapid separation biological treatment → spore transfer treatment → ozone sterilization.
PAC and PAM are added into wastewater and mixed, and COD, TP, SS, turbidity and chromaticity indexes are removed to a certain degree after passing through a filtering device 1 (specifically a fiber rotary disc filter). The effect of the precipitation treatment is shown in Table 2.
TABLE 2 Effect of precipitation treatment
The filtered wastewater enters an ozone catalytic tower 2, the COD of the inlet water is 100 to 112.9mg/L, the COD of the outlet water is 74.3 to 85.1mg/L, the COD removal rate is 20.8 to 29.1 percent, the COD index is removed to a certain degree, and the COD load of a subsequent rapid biological treatment link can be reduced; the B/C of the inlet water is 0.134 to 0.152, the B/C of the outlet water is 0.240 to 0.276, and the B/C is obviously improved, which shows that the biodegradability of the system can be effectively improved by arranging ozone catalytic oxidation before the fast-molecular biological treatment. Specifically, the method comprises the following steps: the wastewater from which suspended matters are removed is mixed with ozone in a countercurrent mode in an ozone catalytic tower 2, a heterogeneous ozone catalyst with the particle size of 3-6 mm is filled in the ozone catalytic tower, on one hand, the heterogeneous ozone catalyst can enable ozone to generate hydroxyl radicals, so that macromolecular organic matters in the wastewater are broken by utilizing the strong oxidizing property of the hydroxyl radicals, and the biodegradability of the organic matters in the wastewater is improved; on the other hand, the retention time of the ozone in the ozone catalytic tower 2 can be increased, and the utilization rate of the ozone is improved. The main function of the stage is to improve the biodegradability of the organic matters and remove part of ammonia nitrogen in water. The reacted gas (mainly oxygen, ozone and water vapor) is discharged from the exhaust pipe at the top end of the ozone catalytic tower and is guided into the disinfection and sterilization tower 6 at the tail end of the system through a first gas pipeline 21 so as to sterilize the wastewater.
After passing through the ozone catalytic tower 2, the wastewater enters an intermediate buffer tank 3 to remove residual ozone and suspended matters in the water. Then the wastewater enters a rapid separation biological pool 4 which adopts an O/A/O multi-stage rapid separation technology. The COD of the inlet water is 70.2 to 84.3mg/L, the COD of the outlet water is 40.3 to 47.4mg/L, the COD removal rate is 37.5 to 47.9 percent, the average value of the COD of the outlet water is 44.7mg/L, and the discharge standard requirement (less than or equal to 50 mg/L) can be met; the ammonia nitrogen of inlet water is 23.6 to 30.2mg/L, the ammonia nitrogen removal rate is 87.7 to 98.3 percent, the average value of the ammonia nitrogen of outlet water is 1.4mg/L and is far lower than the requirement of discharge standard (less than or equal to 5 mg/L); the total nitrogen of inlet water is 64.6 to 81.4mg/L, the total nitrogen removal rate is 83.4 to 88.3 percent, the average value of the total nitrogen of outlet water is 10.04mg/L, and the requirement of discharge standard (less than or equal to 15 mg/L) can be met. Specifically, the method comprises the following steps: the wastewater after the ozone treatment enters the intermediate buffer tank 3, the ozone remained in the wastewater is completely dissipated during the process, the residual ozone is prevented from entering the rapid decomposition biological tank to reduce the activity of microorganisms, and the escaped ozone is guided into the disinfection and sterilization tower 6 at the tail end of the system through the second air pipeline 31 so as to sterilize the wastewater. If suspended matters are generated in the reaction process of the wastewater and the ozone, the inclined plate in the intermediate buffer tank can be utilized to carry out high-efficiency precipitation, so that the suspended matters in the wastewater are separated from the wastewater.
The wastewater passing through the intermediate buffer tank enters a rapid separation biological tank 4, and the removal of pollutants such as organic matters, ammonia nitrogen, total nitrogen and the like is realized under the action of microorganisms by adopting an O/A/O multi-stage biological treatment technology according to the characteristic of low carbon-nitrogen ratio of the leather wastewater. The first stage is a quick-separating aerobic tank, and the ammonia nitrogen in the wastewater is nitrified to fully convert the ammonia nitrogen into nitrate nitrogen; the second stage is a rapid-separation anoxic tank, the carbon-nitrogen ratio is maintained at 5 by adding a carbon source, and the stage is a denitrification reaction, and nitrate nitrogen in the wastewater is removed from the wastewater after being denitrified into nitrogen; the third stage is a fast-separating aerobic tank, which deeply removes the residual organic matters in the wastewater. The rapid separation biological pond is an efficient biological membrane treatment process, has the characteristic of a self-adaptive system, constructs a complete biological chain for overlong sludge age, is self-adaptive according to the change of water quality and water quantity in the changeable environment, and has strong impact load capacity for resisting the water quality and the water quantity. The denitrification treatment of the leather wastewater is realized by the layout of the quick-separating biological balls, the configuration of the filler, the collection and discharge of nitrogen, the accurate carbon source addition, the control of an automatic back-flushing system and the like. The inside anaerobic bacteria of the quick-separating bio-sphere filler degrade the biological sludge synthesized in the surface aerobic reaction in the composite environment, and the fallen low-activity biomembrane is enriched and degraded again under the action of the separation, so that the sludge yield is low. After the wastewater is treated by the rapid decomposition biological pond, except the total phosphorus concentration, the chemical oxygen demand, the total nitrogen and the ammonia nitrogen in the wastewater can all meet the first-level A discharge requirement of the wastewater.
After being subjected to precipitation, ozone catalytic oxidation and rapid biological treatment, the wastewater enters a spore transfer device 5 to further remove COD, TP, SS, turbidity and chromaticity indexes so as to ensure that the effluent stably reaches the standard. Specifically, the method comprises the following steps: referring to fig. 2 (the direction of a dotted arrow is a water flow direction), a spore generator 51 and a spore voltage stabilizer 52 provide micro-nano bubbles, a spore transfer device depends on the huge specific surface area of the micro-nano bubbles, and by utilizing the disturbance generated in the release process of the micro-nano bubbles, a medicament reacts with dissolved phosphorus and hydrophobic base suspended matters in water under the action of a hydraulic flow field to form a 'water-gas-solid three-phase mixture', most of the medicament floats to the water surface to form a scum layer 53 under the synergistic action of the micro-nano bubbles, and the scum layer is automatically scraped to a scum groove 55 through a scum scraper 54; a small portion settles to the bottom to form a sludge layer 56, which is removed by a bottom suction dredge 57 and finally leads the sludge to the sludge discharge tank 55.
The COD of the effluent of the spore transfer device 5 is 32.8 to 38.8mg/L, the COD removal rate is 18.1 to 23.2 percent, and the COD of the effluent meets the discharge requirement (less than or equal to 50 mg/L) of the national first-class A; the effluent TP is 0.07 to 0.09mg/L, the TP removal rate is 70.8 to 75.7 percent, and the effluent TP is far lower than the discharge requirement (less than or equal to 0.5 mg/L) of the national first-class A; the SS of the effluent is 5.5 to 7.5mg/L, the SS removal rate is 70 to 77.6 percent, and the SS of the effluent meets the discharge requirement (less than or equal to 10 mg/L) of the national first-class A; the color intensity of the discharged water is 12.1 to 14.7 times, the color removal rate is 40.5 to 46.9 percent, and the color intensity of the discharged water meets the discharge requirement (less than or equal to 30 times) of the first class A of the national standard.
The wastewater reaching the standard enters an ozone sterilization tower 6 again, and is sterilized and decolored with ozone escaping from a front-end ozone catalytic tower 2 and a middle buffer pool 3, and the dissolved oxygen of the treated wastewater approaches a saturated state and can be stably maintained for a long time, so that the self-purification capacity of the water bodies of the accepting lakes and rivers can be obviously improved, the in-situ reduction of bottom mud is realized, and the ecological recovery capacity of the accepting water bodies is improved.
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 think of the changes or substitutions within the technical scope of the present invention, and shall cover 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 (8)
1. A system for deeply treating leather wastewater is characterized by comprising a filtering device, an ozone catalytic tower, an intermediate buffer tank, a rapid separation biological tank, a spore transfer device and a disinfection and sterilization tower which are sequentially connected; wherein:
the filtering device is used for reducing the content of suspended matters in the leather wastewater;
the ozone catalytic tower is used for improving the biodegradability of organic matters in the leather wastewater;
the middle buffer pool is used for dissipating residual ozone in the leather wastewater and separating suspended matters generated in the ozone reaction process;
the rapid separation biological pond is used for reducing the content of organic matters, ammonia nitrogen and total nitrogen in the leather wastewater;
the spore transferring device is used for reducing the content of total phosphorus, suspended matters and COD in the leather wastewater;
the disinfection and sterilization tower is used for disinfecting and sterilizing the leather wastewater and removing and decoloring organic matters in the leather wastewater.
2. The system for advanced treatment of leather wastewater as claimed in claim 1, wherein the filtering device is a fiber rotary disc filter.
3. The system for advanced treatment of leather wastewater as claimed in claim 1, wherein the ozone catalysis tower is connected with the disinfection and sterilization tower through a first air pipeline; the middle buffer pool is connected with the disinfection and sterilization tower through a second air pipeline; wherein:
the first gas pipeline is used for conveying oxygen, ozone and water vapor generated in the ozone catalytic tower to the disinfection and sterilization tower;
the second air pipeline is used for conveying the residual ozone to the disinfection and sterilization tower.
4. The system for deeply treating leather wastewater as set forth in claim 1, wherein a heterogeneous ozone catalyst is disposed in the ozone catalytic tower.
5. The system for advanced treatment of leather wastewater as claimed in claim 1, wherein the intermediate buffer tank is provided with an inclined plate for sedimentation.
6. The system for deeply treating the leather wastewater as recited in claim 1, wherein the rapid decomposition biological pond adopts an O/A/O multi-stage biological treatment mode; wherein:
the first stage is a fast-separating aerobic tank, the second stage is a fast-separating anoxic tank, and the third stage is still a fast-separating aerobic tank.
7. The system for deeply treating the leather wastewater as recited in claim 1, wherein a spore generator and a spore voltage stabilizer are arranged in the spore transferring device; wherein:
the spore generator and the spore pressure stabilizer together provide micro-nano bubbles.
8. The method for deeply treating the leather wastewater is characterized by comprising the following steps:
introducing the leather wastewater into a filtering device, and sequentially passing through an ozone catalytic tower, an intermediate buffer tank, a rapid separation biological tank, a spore transfer device and a disinfection and sterilization tower.
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Application publication date: 20230120 |