CN110937759A - Multistage sewage treatment device and sewage treatment method thereof - Google Patents
Multistage sewage treatment device and sewage treatment method thereof Download PDFInfo
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- CN110937759A CN110937759A CN201911284505.4A CN201911284505A CN110937759A CN 110937759 A CN110937759 A CN 110937759A CN 201911284505 A CN201911284505 A CN 201911284505A CN 110937759 A CN110937759 A CN 110937759A
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- 239000010865 sewage Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 100
- 239000001301 oxygen Substances 0.000 claims abstract description 100
- 238000005273 aeration Methods 0.000 claims abstract description 93
- 238000004062 sedimentation Methods 0.000 claims abstract description 54
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 206010021143 Hypoxia Diseases 0.000 claims abstract description 14
- 239000010802 sludge Substances 0.000 claims description 74
- 230000002829 reductive effect Effects 0.000 claims description 18
- 238000004659 sterilization and disinfection Methods 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 230000015271 coagulation Effects 0.000 claims description 11
- 238000005345 coagulation Methods 0.000 claims description 11
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
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- 239000007788 liquid Substances 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 16
- 241000894006 Bacteria Species 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052799 carbon Inorganic materials 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 8
- 239000011574 phosphorus Substances 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract 1
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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
- C02F3/308—Biological phosphorus removal
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
-
- 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
- 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
-
- 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
- C02F2209/22—O2
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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
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Microbiology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to the technical field of sewage treatment, and provides a multistage sewage treatment device and a sewage treatment method thereof. Including the preliminary sedimentation pond, anaerobism pond, oxygen deficiency pond and the good oxygen pond that communicate the setting in order, good oxygen pond communicates in order and sets up a plurality ofly, be provided with baffle one in the good oxygen pond, the lower extreme of baffle one with the diapire clearance setting of good oxygen pond is followed the time and is prolonged the rivers direction baffle one will good oxygen pond is separated for good oxygen district and settling zone, be provided with aeration equipment in the good oxygen district, the lower part of preliminary sedimentation pond is provided with the mud collecting region, the mud collecting region with anaerobism pond oxygen deficiency pond intercommunication. The carbon source requirements of denitrifying bacteria and phosphorus accumulating bacteria can be met without an additional carbon source, the arrangement of the plurality of aerobic tanks realizes the step-by-step treatment of sewage, organic matters in the sewage can be continuously subjected to further biological reaction, and the nitrogen and phosphorus removal effects are improved.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a multistage sewage treatment device and a sewage treatment method thereof.
Background
The active sludge method is widely applied to sewage treatment systems, the method is to remove organic matters in wastewater by using active sludge in an artificial oxygenation aeration tank, and the AAO process is an improved active sludge method, and has the advantages of degrading organic pollutants and having certain functions of nitrogen and phosphorus removal. The traditional AAO process often has the problem of low total nitrogen removal rate, and the first is that because of the competitive relationship between denitrifying bacteria and phosphorus accumulating bacteria, the phosphorus accumulating bacteria in the anaerobic section utilize a large amount of carbon sources, so that the carbon sources in the anoxic pond are insufficient. And secondly, the dissolved oxygen concentration of the internal reflux sludge is high, so that the dissolved oxygen concentration of the anoxic tank is unstable. And the traditional aerobic tank has more functional microorganisms, but high-efficiency dominant bacteria are difficult to form. Meanwhile, after the system runs for a long time, the sludge concentration is high, and the subsequent running load of the system is greatly increased.
Disclosure of Invention
The invention aims to provide a multistage sewage treatment device, which ensures that enough carbon source is provided for sewage treatment, improves the nitrogen and phosphorus removal effect and improves the organic matter removal effect.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a multistage sewage treatment plant, is including the preliminary sedimentation pond, anaerobism pond, oxygen deficiency pond and the good oxygen pond that communicate the setting in order, good oxygen pond communicates the setting in order and is a plurality ofly, be provided with baffle one in the good oxygen pond, the lower extreme of baffle one with the diapire clearance of good oxygen pond sets up, follows the water flow direction baffle one will good oxygen pond is separated for aerobic zone and settling zone, be provided with aeration equipment in the aerobic zone, the lower part of preliminary sedimentation pond is provided with the mud collecting region, the mud collecting region with anaerobism pond/oxygen deficiency pond intercommunication.
Optionally, aeration rates of aeration devices in the aerobic tanks which are sequentially communicated are gradually reduced, and the aerobic tank at the tail end is communicated with the anoxic tank through a mixed liquid reflux pump.
Optionally, still be provided with the dissolved oxygen appearance that is used for detecting sewage dissolved oxygen concentration in the aerobic tank, the dissolved oxygen appearance is connected with the controller of exposing to the sun, the controller of exposing to the sun is used for receiving the dissolved oxygen concentration that the dissolved oxygen appearance detected still includes does the aeration fan of aeration equipment air feed, the controller of exposing to the sun with the aeration fan electricity is connected.
Optionally, a slope plate is arranged in the aerobic tank, and the slope plate extends obliquely from the bottom wall of the aerobic tank to the rear wall of the aerobic tank.
Optionally, the antetheca upper portion of just sinking the pond is provided with the inlet tube, sewage by the back wall upper portion of just sinking the pond flows in the anaerobism pond, mud collecting area is provided with album mud device, the lower part of just sinking the pond pass through the mud delivery pump with anaerobism pond/oxygen deficiency pond intercommunication.
Optionally, the rear end of good oxygen pond is provided with the oblique heavy pond, be provided with baffle two in the oblique heavy pond, baffle two with the diapire clearance setting in oblique heavy pond, baffle two will the oblique heavy pond is separated for buffer zone and gathers heavy district, the lower part in oblique heavy pond is the back taper, it is provided with the pipe chute in the heavy district to gather, the lower part in oblique heavy pond with anaerobism pond/oxygen deficiency pond intercommunication.
Optionally, the rear end of the inclined sedimentation tank is sequentially provided with a filtering tank and a disinfection tank, filtering filler is arranged in the filtering tank, and an ultraviolet generating device is arranged in the disinfection tank.
Optionally, the rear end of the disinfection tank is provided with an equipment room, the equipment room is internally provided with a medicament adding device and an aeration fan, and an adding pipe is arranged between the medicament adding device and each tank body.
The invention also aims to provide a multistage sewage treatment device which can ensure that a sufficient carbon source is provided for sewage treatment and can effectively reduce the sludge discharge amount.
In order to achieve the purpose, the invention adopts the following technical scheme: a sewage treatment method of a multistage sewage treatment device comprises the following steps:
A. sewage flows into the upper part of the primary sedimentation tank from the water inlet pipe, sludge is sedimentated in the primary sedimentation tank to a sludge collecting region, and the sludge is introduced into the anaerobic tank/anoxic tank by the sludge delivery pump after being hydrolyzed and acidified for a certain time at the lower part of the primary sedimentation tank;
B. sewage flows into an anaerobic tank from a primary sedimentation tank, the sewage flows into an anoxic tank after undergoing an anaerobic reaction in the anaerobic tank, and the sewage flows into an aerobic tank after undergoing an anoxic reaction in the anoxic tank;
C. the sewage firstly enters an aerobic zone to generate aerobic reaction, then flows into a settling zone from a gap between a first partition plate and a bottom wall, is settled in the process of flowing from bottom to top in the settling zone, part of sludge is settled to the lower part of an aerobic tank to continuously generate aerobic reaction, the sewage enters the next aerobic tank to continuously generate aerobic reaction and sludge settlement, the aeration amount of aeration devices in a plurality of aerobic tanks is gradually reduced, and then the sewage flows into an inclined settling tank;
D. sewage firstly flows from top to bottom in the buffer area, sludge is precipitated along the lower part of the inverted cone of the inclined sedimentation tank, the sewage flows into the coagulation area from a gap between the second partition plate and the bottom wall, the sludge is subjected to coagulation and precipitation through the obstruction of the inclined pipe in the flowing process of the sewage from bottom to top in the coagulation area, and then the sewage sequentially flows into the filtering tank and the sterilizing tank;
E. the sewage is finally discharged through final sedimentation of the filter tank and ultraviolet disinfection of the disinfection tank.
Optionally, in the step C, three aerobic tanks are arranged, namely an aerobic tank i, an aerobic tank ii and an aerobic tank iii in sequence, and the aeration amounts of the aeration devices in the three aerobic tanks are 4mg/L, 3mg/L and 2mg/L correspondingly;
when the dissolved oxygen concentration of the first aerobic pool is detected by the dissolved oxygen instrument to be greater than or equal to 4mg/L, the aeration controller controls the aeration fan corresponding to the first aerobic pool to stop working, and when the dissolved oxygen concentration is less than or equal to 3mg/L, the aeration controller controls the aeration fan corresponding to the first aerobic pool to start working;
when the dissolved oxygen concentration of the second aerobic pool is detected by the dissolved oxygen instrument to be greater than or equal to 3mg/L, the aeration controller controls the aeration fan corresponding to the second aerobic pool to stop working, and when the dissolved oxygen concentration is less than or equal to 2mg/L, the aeration controller controls the aeration fan corresponding to the second aerobic pool to start working;
when the dissolved oxygen concentration of the third aerobic tank is detected by the dissolved oxygen meter to be more than or equal to 2mg/L, the aeration controller controls the aeration fan corresponding to the third aerobic tank to stop working, and when the dissolved oxygen concentration is less than or equal to 1mg/L, the aeration controller controls the aeration fan corresponding to the third aerobic tank to start working.
Compared with the prior art, the method has the advantages that an external carbon source is not needed, the cost is saved, the carbon source requirements of denitrification and phosphorus accumulating bacteria are supplemented after the sludge in the primary sedimentation tank is hydrolyzed and acidified, the hydrolysis and acidification tank is not needed to be independently arranged, the synchronous treatment of the sewage and the sludge is realized, the step-by-step treatment of the sewage is realized by the arrangement of the plurality of aerobic tanks, the organic matters in the sewage can be continuously subjected to further biological reaction, the sewage can also have a certain denitrification effect in the sedimentation zone except the aerobic reaction in the aerobic zone in the process, the denitrification and dephosphorization effects are improved, and thus the device can perform effective sewage treatment and improve the quality of the effluent water; simultaneously, the sludge amount in the aerobic tank is controlled, and the excessive discharge of sludge is avoided to increase the subsequent sludge treatment load.
Drawings
Fig. 1 is a schematic view of the arrangement of the present invention.
Reference numerals:
1. a primary sedimentation tank; 11. a water inlet pipe; 12. a mud collection device; 2. an anaerobic tank; 3. an anoxic tank; 4. an aerobic tank; 41. an aerobic zone; 42. a settling zone; 43. a first clapboard; 44. an aeration device; 45. an oxygen dissolving instrument; 46. an aeration controller; 47. an aeration fan; 48. a ramp plate; 5. an inclined settling tank; 51. a buffer area; 52. a coagulation zone; 53. a second clapboard; 54. an inclined tube; 6. a filtration tank; 7. a disinfection tank; 8. an equipment room; 81. a medicament feeding device.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
As shown in figure 1, the multistage sewage treatment device provided by the invention comprises a primary sedimentation tank 1, an anaerobic tank 2, an anoxic tank 3 and an aerobic tank 4 which are sequentially communicated, wherein a plurality of aerobic tanks 4 are sequentially communicated, a sludge collecting region is arranged at the lower part of the primary sedimentation tank 1, and the sludge collecting region is communicated with the anaerobic tank 2/the anoxic tank 3.
Compared with the prior art, the front end of the anaerobic tank 2 is provided with the primary sedimentation tank 1, sewage enters the sedimentation tank 1, then sludge is precipitated into the primary sedimentation tank 1, the lower part of the primary sedimentation tank 1 collects the sludge, the sludge directly stays at the lower part of the primary sedimentation tank 1 for hydrolytic acidification, insoluble organic matters are hydrolyzed into soluble substances, macromolecular and difficultly biodegradable substances are converted into easily biodegradable substances, and partial hydrolytic acidification products at the lower part of the primary sedimentation tank 1 are conveyed to the anaerobic tank 2/anoxic tank 3 through the sludge conveying pump after a certain time to supplement a carbon source, so that the carbon source requirements of denitrifying bacteria and phosphorus accumulating bacteria are met;
through the sewage after the primary sedimentation takes place for the primary sedimentation 1 take place anaerobic reaction and oxygen deficiency reaction through anaerobism pond 2 and oxygen deficiency pond 3 in proper order and get into good oxygen pond 4, be provided with mixed liquid backwash pump between a plurality of good oxygen ponds 4 and the oxygen deficiency pond 3 for mixed liquid further takes place denitrification in oxygen deficiency pond 3, improve the denitrogenation effect, good oxygen pond 4 of this application has arranged a plurality ofly, and good oxygen pond 4 is separated for good oxygen district 41 and settling zone 42, the purpose of so arranging is: the sewage enters the aerobic zone 41 to carry out aerobic reaction to decompose the sludge, then the sewage enters the sedimentation zone 42 to flow from bottom to top, partial sludge can be settled, so that part of the sludge can be intercepted and continuously remained in the aerobic tank 4 to enable aerobic microorganisms to continuously decompose organic matters in the sewage, the aeration device 44 is not arranged in the sedimentation zone 42, the dissolved oxygen concentration in the sedimentation zone 42 is gradually reduced to form a micro-anoxic state, denitrification reaction is carried out to remove nitrogen, then the sewage with the reduced sludge content enters the next aerobic tank, part of the sludge is intercepted, the arrangement of the plurality of aerobic tanks is used for carrying out step-by-step treatment on the sewage, the sewage can also carry out certain denitrification action in the sedimentation zone 42 except the aerobic reaction in the aerobic zone 41 in the process, so that the device can carry out effective sewage treatment and ensure the sludge amount in the aerobic tank, the subsequent sludge treatment load is prevented from being increased due to excessive sludge discharge.
In some embodiments, three aerobic tanks 4 are provided, namely three tanks can meet the requirement of sludge treatment, the construction cost is increased when the number of the tanks is too large, and the aeration amount of the aeration devices in the three aerobic tanks 4 which are sequentially communicated is gradually reduced. Along with the flowing of the sewage, the sludge amount is gradually reduced, the content of organic matters in the sewage is also reduced, the oxygen requirement of the subsequent aerobic tanks 4 is reduced, so that the aeration amount in the three aerobic tanks 4 is gradually reduced, and the energy consumption can be reduced; meanwhile, a part of sludge can be intercepted in each aerobic tank 4, and microorganisms with different oxygen requirements attached to the sludge are beneficial to becoming dominant bacteria at different oxygen concentrations, so that the dominant bacteria can be enriched in each aerobic tank 4, sewage with different substrate concentrations can carry out biological reaction in the corresponding aerobic tanks 4, the organic matters in the sewage are fully decomposed by the coaction of the different dominant bacteria in the different aerobic tanks 4, and the treatment effect of the sewage is optimal; meanwhile, as a preferred embodiment, the oxygen concentration of the terminal aerobic tank 4 is lower, so that the terminal aerobic tank 4 is communicated with the anoxic tank 3, and thus when the mixed liquid of the aerobic tank 4 flows back into the anoxic tank 3, the oxygen concentration of the anoxic tank 3 is not unstable, the denitrification reaction effect is improved, and the denitrification effect is increased.
In some embodiments, an oxygen dissolving instrument 45 for detecting the dissolved oxygen concentration of the sewage is further disposed in the aerobic tank 4, the oxygen dissolving instrument 45 is connected with an aeration controller 46, the aeration controller 46 is configured to receive the dissolved oxygen concentration detected by the oxygen dissolving instrument 45, and an aeration fan 47 for supplying air to the aeration device 44 is further included, and the aeration controller 46 is electrically connected with the aeration fan 47. In order to reduce energy consumption, the aeration device 44 is correspondingly and intermittently started, the start-stop condition of the aeration device 44 is whether the dissolved oxygen concentration of each aerobic tank 4 is lower than an upper limit threshold or reaches the upper limit threshold, the dissolved oxygen concentration of the aerobic tank 4 is monitored in real time by the dissolved oxygen meter 45, and the aeration controller 46 judges the dissolved oxygen concentration and sends out a control signal to control the start and stop of the aeration fan 47, so that each aerobic tank 4 is ensured to have a certain dissolved oxygen concentration all the time, and oxygen surplus waste is avoided. The aeration controller 46 controls the start and stop of the aeration fan 47, which can be easily realized by the technical means disclosed in the prior art, the aeration controller 46 adopts a single chip microcomputer, the type of the single chip microcomputer can adopt AT89C51, STC15 and other types of single chip microcomputers, the single chip microcomputer is provided with a logic judgment circuit which can compare the dissolved oxygen concentration detected by the dissolved oxygen meter 45 with an upper limit threshold value/a lower limit threshold value, the logic judgment circuit can be realized by an integrated numerical comparator such as 74LS85, the single chip microcomputer sends a control signal to a relay according to a judgment result, the relay is also a commonly used control device in the prior art, the relay is arranged on a power supply circuit of the aeration fan 47, the single chip microcomputer sends the control signal to the relay to control a contact switch of the relay to be opened or closed, and the single chip microcomputer controls each relay according to the dissolved oxygen concentration acquired by the dissolved oxygen meter 45 of each biological reaction area, so that the aeration fan 47 is correspondingly controlled to stop working or start working.
In some embodiments, a slope plate 48 is disposed in the aerobic tank 4, the lower end of the slope plate 48 is disposed near the lower portion of the partition plate 43, and the slope plate 48 extends obliquely from the bottom wall of the aerobic tank 4 to the rear wall of the aerobic tank 4. The slope plate 48 plays a role in buffering sewage from the aerobic zone 41 to the settling zone 42, sludge is prevented from settling through the buffering of the slope plate 48, so that the settling amount of the sludge in the settling zone 42 is adjusted, and the sludge settling amount is controlled step by the plurality of aerobic tanks 4 so as to decompose the sludge through biological reaction step by step.
In some embodiments, the sewage flows into the tank from the upper part of the front wall of the primary sedimentation tank 1, the sewage is precipitated during the flowing process of the sewage into the anaerobic tank 2, the sludge is collected to the sludge collecting region, in a preferred embodiment, the lower part of the primary sedimentation tank 1 is set to be in an inverted cone shape, the sludge collecting device 12 can adopt a sludge scraper, so that the sludge is collected to the lower part of the primary sedimentation tank 1 as much as possible, the sludge is hydrolyzed and acidified at the lower part of the primary sedimentation tank 1, and the product is conveyed to the anaerobic tank 2/anoxic tank 3 through a sludge conveying pump, and the arrangement stably provides a carbon source for the anaerobic tank 2/anoxic tank 3.
In some embodiments, the rear end of the aerobic tank 4 is provided with a slant deposition tank 5, the slant deposition tank 5 collects the residual sludge, part of the sludge can be provided to the anaerobic tank 2/anoxic tank 3 through a sludge reflux pump, part of the sludge is discharged as the residual sludge, the slant deposition tank 5 is provided with a second partition plate 53, the second partition plate 53 is arranged in a gap with the bottom wall of the slant deposition tank 5, the second partition plate 53 divides the slant deposition tank 5 into a buffer zone 51 and a coagulation zone 52, the lower part of the slant deposition tank 5 is in an inverted cone shape, an inclined pipe 54 is arranged in the coagulation zone 52, and the arrangement of the buffer zone 51, the coagulation zone 52 and the lower part of the inverted cone shape is more beneficial to sludge aggregation and deposition.
In some embodiments, the rear end of the inclined sedimentation tank 5 is further provided with a filtering tank 6 and a disinfecting tank 7 in sequence, filtering filler is arranged in the filtering tank 6, an ultraviolet generating device is arranged in the disinfecting tank 7, and sewage is discharged more cleanly through the final treatment of the filtering tank 6 and the disinfecting tank 7.
In some embodiments, the rear end of the disinfection tank 7 is provided with an equipment chamber 8, the equipment chamber 8 is internally provided with a medicament adding device 81 and an aeration fan 47, and adding pipes are arranged between the medicament adding device 81 and each tank body. And adding agents such as iron salt, a carbon source, a pH regulator and the like through the agent adding device 81 correspondingly according to data such as MLSS concentration, carbon nitrogen content, metal ion content and the like of each tank to increase biological reaction effect and chemical reaction effect in the sewage treatment process.
A sewage treatment method of a multistage sewage treatment device comprises the following steps:
A. sewage flows into the upper part of the primary sedimentation tank 1 from a water inlet pipe 11, sludge is sedimentated in the primary sedimentation tank 1 to a sludge collecting region, and the sludge is introduced into the anaerobic tank 2/anoxic tank 3 by a sludge delivery pump after being hydrolyzed and acidified for a certain time at the lower part of the primary sedimentation tank 1;
B. sewage flows into an anaerobic tank 2 from a primary sedimentation tank 1, the sewage generates anaerobic reaction in the anaerobic tank 2 and then flows into an anoxic tank 3, and the sewage generates anoxic reaction in the anoxic tank 3 and then flows into an aerobic tank 4;
C. the sewage firstly enters an aerobic zone 41 to generate aerobic reaction, then flows into a settling zone 42 from a gap between a first partition plate 43 and the bottom wall, is settled in the process of flowing from bottom to top in the settling zone 42, part of sludge is settled to the lower part of an aerobic tank 4 to continuously generate aerobic reaction, the sewage enters the next aerobic tank 4 to continuously generate aerobic reaction and sludge settlement, the aeration amount of aeration devices 44 in a plurality of aerobic tanks 4 is gradually reduced, and then the sewage flows into an inclined settling tank 5;
D. sewage firstly flows from top to bottom in a buffer area 51, sludge is precipitated at the lower part of the inverted cone shape of the sludge forward-extending inclined sedimentation tank 5, the sewage flows into a coagulation area 52 from a gap between a second partition plate 53 and the bottom wall, the sludge is subjected to aggregation and precipitation through the obstruction of an inclined pipe 54 in the process that the sewage flows from bottom to top in the coagulation area 52, the aeration amount of the aeration devices 44 in the aerobic tanks 4 is gradually reduced, and then the sewage flows into the filter tank 6 and the disinfection tank 7 in sequence;
E. the sewage is finally discharged through final sedimentation in the filter 6 and ultraviolet sterilization in the sterilization tank 7.
Specifically, in the step C, three aerobic tanks 4 are arranged, namely an aerobic tank I, an aerobic tank II and an aerobic tank III in sequence, and the aeration amounts of the aeration devices 44 in the three aerobic tanks 4 are 4mg/L, 3mg/L and 2mg/L correspondingly;
when the dissolved oxygen meter 45 detects that the dissolved oxygen concentration of the first aerobic tank is greater than or equal to 4mg/L, the aeration controller 46 controls the aeration fan 47 corresponding to the first aerobic tank to stop working, and when the dissolved oxygen concentration is less than or equal to 3mg/L, the aeration controller 46 controls the aeration fan 47 corresponding to the first aerobic tank to start working, so that the dissolved oxygen concentration in the first aerobic tank is ensured to be in a range of 3 mg/L-4 mg/L, the pollutant concentration in the first aerobic tank is higher, the content of activated sludge is higher, and the required dissolved oxygen is higher;
when the dissolved oxygen meter 45 detects that the dissolved oxygen concentration of the second aerobic tank is greater than or equal to 3mg/L, the aeration controller 46 controls the aeration fan 47 corresponding to the second aerobic tank to stop working, and when the dissolved oxygen concentration is less than or equal to 2mg/L, the aeration controller 46 controls the aeration fan 47 corresponding to the second aerobic tank to start working, so that the dissolved oxygen concentration in the second aerobic tank is ensured to be in a range of 2 mg/L-3 mg/L, the pollutant concentration at this stage is low, and the required dissolved oxygen is reduced;
when the dissolved oxygen meter 45 detects that the dissolved oxygen concentration of the third aerobic tank is greater than or equal to 2mg/L, the aeration controller 46 controls the aeration fan 47 corresponding to the third aerobic tank to stop working, and when the dissolved oxygen concentration is less than or equal to 1mg/L, the aeration controller 46 controls the aeration fan 47 corresponding to the third aerobic tank to start working, so that the dissolved oxygen concentration in the second aerobic tank is ensured to be in a range of 1 mg/L-2 mg/L, the water quality is clearer at this stage, pollutants in water are less, the amount of retained sludge is less, and therefore the lower dissolved oxygen concentration can be maintained.
It should be emphasized here that the sedimentation zone 42 of the first aerobic tank and the second aerobic tank does not necessarily have to perform the denitrification nitrogen removal function, because the dissolved oxygen concentration of the aerobic zone 41 of the first aerobic tank and the second aerobic tank is higher, even though the oxygen content of the sewage is gradually reduced when the sewage enters the sedimentation zone 42, the dissolved oxygen concentration of the sewage is not necessarily reduced to a micro-anoxic state, the hydraulic retention time is increased by properly increasing the volume of the sedimentation zone 42, so that the oxygen content of the sewage is gradually reduced to 0.1 mg/L-1 mg/L, the sedimentation zone 42 of the third aerobic tank has to perform the denitrification nitrogen removal function, because the dissolved oxygen concentration of the aerobic zone 41 of the third aerobic tank is already at a lower level, the dissolved oxygen concentration of the sewage at the moment when the sewage enters the sedimentation zone 42 can form a micro-anoxic state, and then denitrification nitrogen removal is performed, and in all, the three aerobic tanks perform the step-by step, different aeration quantities are adopted to decompose the organic matters by stages, so that the energy consumption is saved, and the water quality of the sewage flowing out of the aerobic tank 4 is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a multistage sewage treatment plant which characterized in that: including the preliminary sedimentation pond (1), anaerobism pond (2), oxygen deficiency pond (3) and the good oxygen pond (4) that communicate the setting in order, good oxygen pond (4) communicate in order and set up a plurality ofly, be provided with baffle (43) in good oxygen pond (4), the lower extreme of baffle (43) with the diapire clearance setting of good oxygen pond (4), the water flow direction is followed to extension baffle (43) will good oxygen pond (4) are separated for good oxygen district (41) and sedimentation zone (42), be provided with aeration equipment (44) in good oxygen district (41), the lower part of preliminary sedimentation pond (1) is provided with the mud collecting region, the mud collecting region with anaerobism pond (2)/oxygen deficiency pond (3) intercommunication.
2. The multi-stage sewage treatment apparatus of claim 1, wherein: aeration rates of aeration devices (44) in the aerobic tanks (4) which are sequentially communicated are gradually reduced, and the aerobic tank (4) at the tail end is communicated with the anoxic tank (3) through a mixed liquid reflux pump.
3. The multi-stage sewage treatment apparatus of claim 1, wherein: still be provided with dissolved oxygen appearance (45) that are used for detecting sewage dissolved oxygen concentration in good oxygen pond (4), dissolved oxygen appearance (45) are connected with aeration controller (46), aeration controller (46) are used for receiving the dissolved oxygen concentration that dissolved oxygen appearance (45) detected still includes for aeration fan (47) of aeration equipment (44) air feed, aeration controller (46) with aeration fan (47) electricity is connected.
4. The multi-stage sewage treatment apparatus of claim 1, wherein: a slope plate (48) is arranged in the aerobic tank (4), and the slope plate (48) extends from the bottom wall of the aerobic tank (4) to the rear wall of the aerobic tank (4) in an inclined mode.
5. The multi-stage sewage treatment apparatus of claim 1, wherein: the antetheca upper portion of just sinking pond (1) is provided with inlet tube (11), sewage by the back wall upper portion of just sinking pond (1) flows in anaerobism pond (2), mud collecting region is provided with album mud device (12), the lower part of just sinking pond (1) pass through the mud delivery pump with anaerobism pond (2)/oxygen deficiency pond (3) intercommunication.
6. The multi-stage sewage treatment apparatus of claim 1, wherein: the rear end of good oxygen pond (4) is provided with oblique heavy pond (5), be provided with baffle two (53) in oblique heavy pond (5), baffle two (53) with the diapire clearance of oblique heavy pond (5) sets up, baffle two (53) will oblique heavy pond (5) are separated for buffer zone (51) and gather heavy district (52), the lower part of oblique heavy pond (5) is the back taper, it is provided with pipe chute (54) in heavy district (52) to gather, the lower part of oblique heavy pond (5) with anaerobism pond (2)/oxygen deficiency pond (3) intercommunication.
7. The multi-stage sewage treatment plant of claim 6, wherein: the rear end of the inclined sedimentation tank (5) is also sequentially provided with a filtering tank (6) and a disinfection tank (7), the filtering tank (6) is internally provided with filtering filler, and the disinfection tank (7) is internally provided with an ultraviolet generating device.
8. The multi-stage sewage treatment plant of claim 7, wherein: the rear end of disinfection pond (7) is provided with equipment room (8), be provided with medicament and throw feeder apparatus (81) and aeration fan (47) in equipment room (8), it throws and is provided with between feeder apparatus (81) and each cell body and throws the feeder tube to medicament.
9. A sewage treatment method of a multistage sewage treatment device is characterized in that: the method comprises the following steps:
A. sewage flows into the upper part of the primary sedimentation tank (1) from the water inlet pipe (11), sludge is precipitated in the primary sedimentation tank (1) to a sludge collecting region, and the sludge is introduced into the anaerobic tank (2)/the anoxic tank (3) by a sludge delivery pump after being hydrolyzed and acidified for a certain time at the lower part of the primary sedimentation tank (1);
B. sewage flows into an anaerobic tank (2) from a primary sedimentation tank (1), the sewage generates anaerobic reaction in the anaerobic tank (2) and then flows into an anoxic tank (3), and the sewage generates anoxic reaction in the anoxic tank (3) and then flows into an aerobic tank (4);
C. the sewage firstly enters an aerobic zone (41) to generate aerobic reaction, then flows into a settling zone (42) from a gap between a first partition plate (43) and the bottom wall, is settled in the settling zone (42) in the flowing process from bottom to top, part of sludge is settled to the lower part of an aerobic tank (4) to continuously generate aerobic reaction, the sewage enters the next aerobic tank (4) to continuously generate aerobic reaction and sludge settling, the aeration amount of aeration devices (44) in a plurality of aerobic tanks (4) is gradually reduced, and then the sewage flows into an inclined settling tank (5);
D. sewage firstly flows from top to bottom in a buffer zone (51), sludge precipitates at the lower part of the inverted cone shape of the sludge forward-extending inclined sedimentation tank (5), the sewage flows into a coagulation zone (52) through a gap between a second partition plate (53) and the bottom wall, the sludge is coagulated and precipitated in the coagulation zone (52) through the obstruction of an inclined pipe (54) in the flowing process of the sewage from bottom to top, and then the sewage sequentially flows into a filter tank (6) and a disinfection tank (7);
E. the sewage is finally discharged through final sedimentation of the filter tank (6) and ultraviolet disinfection of the disinfection tank (7).
10. The wastewater treatment method according to claim 9, characterized in that:
in the step C, three aerobic tanks (4) are arranged, namely an aerobic tank I, an aerobic tank II and an aerobic tank III in sequence, and the aeration amounts of aeration devices (44) in the three aerobic tanks (4) are respectively 4mg/L, 3mg/L and 2 mg/L;
when the dissolved oxygen meter (45) detects that the dissolved oxygen concentration of the first aerobic pool is greater than or equal to 4mg/L, the aeration controller (46) controls the aeration fan (47) corresponding to the first aerobic pool to stop working, and when the dissolved oxygen concentration is less than or equal to 3mg/L, the aeration controller (46) controls the aeration fan (47) corresponding to the first aerobic pool to start working;
when the dissolved oxygen meter (45) detects that the dissolved oxygen concentration of the second aerobic pool is greater than or equal to 3mg/L, the aeration controller (46) controls the aeration fan (47) corresponding to the second aerobic pool to stop working, and when the dissolved oxygen concentration is less than or equal to 2mg/L, the aeration controller (46) controls the aeration fan (47) corresponding to the second aerobic pool to start working;
when the dissolved oxygen meter (45) detects that the dissolved oxygen concentration of the third aerobic tank is greater than or equal to 2mg/L, the aeration controller (46) controls the aeration fan (47) corresponding to the third aerobic tank to stop working, and when the dissolved oxygen concentration is less than or equal to 1mg/L, the aeration controller (46) controls the aeration fan (47) corresponding to the third aerobic tank to start working.
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