CN112320953A - Separate aeration self-circulation two-stage denitrification integrated sewage treatment equipment and method - Google Patents
Separate aeration self-circulation two-stage denitrification integrated sewage treatment equipment and method Download PDFInfo
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- CN112320953A CN112320953A CN202011272017.4A CN202011272017A CN112320953A CN 112320953 A CN112320953 A CN 112320953A CN 202011272017 A CN202011272017 A CN 202011272017A CN 112320953 A CN112320953 A CN 112320953A
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- 239000010865 sewage Substances 0.000 title claims abstract description 135
- 238000005273 aeration Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 237
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 19
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 10
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000010802 sludge Substances 0.000 claims description 65
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 238000004062 sedimentation Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 244000005700 microbiome Species 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000006213 oxygenation reaction Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000006396 nitration reaction Methods 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 230000001174 ascending effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 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
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F7/00—Aeration of stretches of water
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a separated aeration self-circulation two-section denitrification integrated sewage treatment device and a method, comprising a water inlet pipe, an anoxic tank, an aeration tank, an upflow aerobic tank, a water collecting tank and a water outlet pipe, wherein the water inlet pipe is communicated with the anoxic tank, the water outlet pipe is communicated with the upper part of the water collecting tank, and the bottom of the aeration tank is provided with an aeration disc; the anoxic tank is communicated with the aeration tank through an overflow pipe, the aeration tank is communicated with the upflow aerobic tank through a reaction tank water inlet pipe, the upper part of the upflow aerobic tank is provided with an overflow weir, the overflow weir is communicated with a water collecting tank, and the water collecting tank is communicated with the anoxic tank through a return pipe. The integrated sewage treatment equipment not only realizes oxygenation, but also forms automatic circular flow of sewage in the whole treatment equipment without an external power source, thereby reducing the energy consumption in the sewage treatment process. The ammonia nitrogen in the sewage is converted into nitrate nitrogen through nitration reaction, the nitrate nitrogen is converted into nitrogen through denitrification, and the nitrogen is removed, and the cyclic treatment is carried out for tens of times to dozens of times, so that the denitrification effect of the sewage is ensured.
Description
Technical Field
The invention relates to sewage treatment equipment and a method, in particular to split aeration self-circulation two-stage denitrification integrated sewage treatment equipment and a method.
Background
At present, the mainstream technology of sewage treatment is a traditional activated sludge method, and the process realizes the removal of organic matters, nitrogen and phosphorus by utilizing a microorganism nitrification and denitrification mode. With the development of economy, the requirements of sewage treatment and the types of sewage are continuously increased, and the defects of low impact load resistance and poor harmful substance resistance of the traditional activated sludge are amplified.
The aerobic granular sludge is activated sludge formed by the self-coagulation of microorganisms under the aerobic condition, and compared with the traditional activated sludge, the activated sludge has higher microbial biomass, stronger activity, good settling property, impact load resistance and stronger toxic and harmful substance resistance. However, the prior method for culturing aerobic granular sludge and treating sewage by using the aerobic granular sludge adopts an intermittent water inlet mode, and the method reduces the sewage treatment efficiency to a greater extent. The invention aims to provide an integrated sewage treatment device which utilizes aerobic granular sludge and anaerobic granular sludge to replace the traditional activated sludge to realize efficient and stable operation under the condition of continuous water inlet and outlet.
Disclosure of Invention
In order to overcome the defects of the technical problems, the invention provides a separated aeration self-circulation two-stage denitrification integrated sewage treatment device and a method.
The invention discloses split aeration self-circulation two-section denitrification integrated sewage treatment equipment, which comprises a water inlet pipe, an anoxic tank, an aeration tank, an upflow aerobic tank, a water collecting tank and a water outlet pipe, wherein the water inlet pipe is communicated with the anoxic tank, and sewage to be treated flows into the anoxic tank through the water inlet pipe; the water outlet pipe is communicated with the upper part of the water collecting tank, and the treated sewage is discharged through the water outlet pipe; a plurality of aeration discs are arranged at the bottom of the aeration tank; the method is characterized in that: an overflow pipe is arranged in the anoxic tank, an inlet of the overflow pipe is communicated with the upper part of the anoxic tank, and an outlet of the overflow pipe is communicated with the bottom of the aeration tank; the aeration tank is communicated with the upflow aerobic tank through a reaction tank water inlet pipe, an inlet of the reaction tank water inlet pipe is communicated with the upper part of the aeration tank, an outlet extends into the bottom of the upflow aerobic tank, the bottom of the upflow aerobic tank is provided with a first water distribution device, the first water distribution device is communicated with an outlet of the reaction tank water inlet pipe, and the first water distribution device is uniformly provided with downward water distribution ports; the water collecting tank is positioned at the upper part of the upflow aerobic tank, the upper part of the upflow aerobic tank is provided with a plurality of overflow weirs which are distributed at intervals, the upper ends of the overflow weirs are opened, the end parts of the overflow weirs are provided with water through ports communicated with the water collecting tank, the water collecting tank is communicated with the anoxic tank through a return pipe, the upper end of the return pipe is communicated with the water collecting tank, the lower end of the return pipe extends into the anoxic tank, the anoxic tank is internally provided with a second water distribution device, and the second water distribution device is communicated with the return pipe; aerobic sludge and anaerobic sludge are respectively cultured in the upflow aerobic tank and the anoxic tank, and a DO probe for detecting the dissolved oxygen value is arranged in the anoxic tank.
According to the separated aeration self-circulation two-section denitrification integrated sewage treatment equipment, the water inlets at the upper ends of the overflow pipe and the overflow weir are both continuous zigzag, and the heights of the overflow pipe and the water inlet at the upper end of the overflow weir are equal; the inner diameter of the water outlet pipe is smaller than that of the return pipe, the position of the water outlet pipe is higher than the overflow weir, and the position of the overflow weir is higher than the inlet of the return pipe.
The invention discloses a separated aeration self-circulation two-section denitrification integrated sewage treatment device, wherein a first water distribution device consists of a plurality of water distribution main pipes and a plurality of water distribution branch pipes which are arranged on the water distribution main pipes, one end of each water distribution main pipe is communicated with a water inlet pipe of a reaction tank, one end of each water distribution branch pipe is communicated with the corresponding water distribution main pipe, and the other end of each water distribution branch pipe is a downward water outlet.
The separated aeration self-circulation two-section denitrification integrated sewage treatment equipment is characterized in that the upper part of the water outlet pipe is provided with an overflow port, and the overflow port is communicated with a water collecting tank.
According to the separated aeration self-circulation two-stage denitrification integrated sewage treatment equipment, the height difference exists between the bottom of the water collecting tank and the water through hole.
The invention discloses a sewage treatment method of a separated aeration self-circulation two-section denitrification integrated sewage treatment device, which is characterized by comprising the following steps of:
a) the sewage to be treated flows into an anoxic tank through a water inlet pipe, anaerobic microorganisms in the sludge in the anoxic tank use organic matters in the water as energy sources, and nitrate nitrogen in the water flowing back through a return pipe is converted into nitrogen to be removed, so that sewage denitrification is realized;
b) aeration and self-circulation, under the aeration action of an aeration disc at the bottom of the aeration tank, the sewage at the bottom of the aeration tank is oxygenated, the aerated sewage expands and rises, so that the density of the sewage at the bottom of the aeration tank is reduced, the water pressure is reduced, and the sewage in the anoxic tank flows into an upflow aerobic tank through an overflow pipe under the action of the water pressure difference; the liquid level of the sewage in the aeration tank rises due to aeration expansion, and the sewage in the aeration tank flows into the upflow aerobic tank through the water inlet pipe of the reaction tank under the action of the liquid level difference; the aeration of the aeration disc realizes the self-circulation flow of the sewage without external power;
c) water distribution and aerobic reaction, wherein sewage flowing in through a water inlet pipe of the reaction tank uniformly flows downwards under the water distribution action of the first water distribution device, and the sludge settled to the bottom is dispersed by utilizing the downwards-flowing water to prevent the sludge from depositing at the bottom; in the process that the sewage flowing into the upflow aerobic tank uniformly rises from bottom to top, aerobic granular sludge with good sedimentation performance is distributed in a state that flocculent sludge with poor sedimentation performance is on the bottom and flocculent sludge with poor sedimentation performance is on the top, aerobic microorganisms in the aerobic granular sludge are fully contacted with the sewage, ammonia nitrogen in the sewage is converted into nitrate nitrogen by consuming dissolved oxygen in the water, and organic matters in the water are removed;
d) discharging and refluxing, wherein sewage on the upper part of the upflow aerobic tank after aerobic reaction treatment flows into a water collecting tank through an overflow weir, flocculent sludge flowing along with the sewage is precipitated to the bottom of the water collecting tank, most of the sewage in the water collecting tank flows back to the anoxic tank through a return pipe, and supernatant is discharged through a water outlet pipe;
e) sewage circulation, namely performing denitrification on the sewage flowing back through the return pipe in an anoxic tank through anaerobic reaction to remove nitrate and nitrogen in the return water; the sludge in the return water participates in the formation of anaerobic sludge in the anoxic tank, the dissolved oxygen value in the anoxic tank is detected by a DO probe, and the dissolved oxygen in the anoxic tank is controlled to be below 0.5mg/L by controlling the aeration amount of an aeration disc; and (3) mixing the return water with the sewage, and then, introducing the mixture into the upflow aerobic tank for treatment, and performing reciprocating circulation in such a way to realize the denitrification treatment of the sewage.
In the sewage treatment method of the separated aeration self-circulation two-section denitrification integrated sewage treatment equipment, in the initial stage of sewage treatment, in order to promote the formation and growth of aerobic granular sludge in the upflow aerobic tank, the aeration quantity of the aeration disc is controlled not to be too large easily, so that the rising speed of water flow in the upflow aerobic tank is controlled, and the sludge loss is reduced.
In the step d), in the effluent and reflux steps, the sewage reflux amount is dozens of to dozens of times of the effluent amount so as to ensure the denitrification effect of the sewage.
The invention has the beneficial effects that: the integrated sewage treatment equipment is provided with the anoxic tank, the aeration tank and the upflow aerobic tank, under the aeration action of the aeration disc at the bottom of the aeration tank, oxygenation and stirring are realized, the density of sewage at the bottom of the aeration tank is reduced due to aeration, the pressure intensity is reduced, and the sewage in the anoxic tank automatically flows into the aeration tank under the action of pressure difference; the liquid level of the sewage in the aeration tank rises due to aeration oxygenation, and the sewage flows into the upflow aerobic tank through the water inlet pipe of the reaction tank under the action of liquid level difference, so that the aeration not only realizes oxygenation, but also forms automatic circulating flow of the sewage in the whole treatment equipment, an external power source is not needed, and the energy consumption in the sewage treatment process is reduced.
In the process that sewage entering an upflow aerobic tank uniformly rises, sludge is distributed in a state that aerobic granular sludge with good sedimentation performance is on top and flocculent sludge with poor sedimentation performance is on top, microorganisms in the aerobic granular sludge consume dissolved oxygen to convert ammonia nitrogen into nitrate nitrogen, and meanwhile decomposition and removal of organic matters are realized; the sewage flowing into the water collecting tank from the upflow aerobic tank flows back to the anoxic tank through the return pipe for the most part, and the supernatant liquid of a few parts is discharged through the water outlet pipe; mixing the sewage in the anoxic tank with the return water, converting nitrate and nitrogen in the return water into nitrogen by using organic matters in the inlet water by using anaerobic microorganisms in the anoxic tank, and finally removing ammonia nitrogen in the sewage; through control, the reflux amount is dozens to dozens of times of the water outlet amount (equal to the water inlet amount), so that the sewage is ensured to be circularly treated for dozens to dozens of times in the treatment equipment, the removal effect of ammonia nitrogen is ensured, and the effluent reaches the discharge standard.
Drawings
FIG. 1 is a front view of an integrated sewage treatment apparatus of the present invention;
FIG. 2 is a rear view of the integrated sewage treatment apparatus of the present invention;
FIG. 3 is a top view of the integrated wastewater treatment facility of the present invention;
FIG. 4 is a perspective view of the integrated sewage treatment apparatus of the present invention;
FIGS. 5, 6 and 7 are sectional views of the integrated sewage treatment apparatus of the present invention;
fig. 8 is a schematic view of the water circulation of the present invention.
In the figure: 1 water inlet pipe, 2 anoxic pond, 3 aeration pond, 4 upflow aerobic pond, 5 water collecting tank, 6 water outlet pipe, 7 overflow pipe, 8 aeration disc, 9 reaction pond water inlet pipe, 10 first water distribution device, 11 overflow weir, 12 reflux pipe, 13 second water distribution device, 14 overflow port, 15 water through port, 16 water distribution trunk pipe, 17 water distribution branch pipe.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1 to 4, a front view, a rear view, a top view and a perspective view of the integrated sewage treatment device of the present invention are respectively shown, fig. 5, fig. 6 and fig. 7 are all cross-sectional views of the integrated sewage treatment device of the present invention, fig. 8 is a schematic view of a water circulation of the present invention, the shown sewage treatment device is composed of a water inlet pipe 1, an anoxic tank 2, an aeration tank 3, an upflow aerobic tank 4, a water collecting tank 5, a water outlet pipe 6, an overflow pipe 7, an aeration tray 8, a reaction tank water inlet pipe 9, a first water distribution device 10, an overflow weir 11, a return pipe 12 and a second water distribution device 13, the aeration tank 3 is located between the anoxic tank 2 and the upflow aerobic tank 4, and the water inlet pipe 1 is arranged on the anoxic tank 2 and is used for introducing sewage to be treated into the anoxic tank 2. The oxygen-poor pond 2 is communicated with the aeration tank 3 through an overflow pipe 7, the overflow pipe 7 is vertically arranged in the oxygen-poor pond 2, the upper end of the overflow pipe 7 is a water inlet, the lower end of the overflow pipe 7 is a water outlet, the water inlet of the overflow pipe 7 is communicated with the upper part of the oxygen-poor pond 2, and the water outlet is communicated with the bottom of the aeration tank 3.
The number of the aeration discs 8 is multiple, the aeration discs 8 are arranged at the bottom of the aeration tank 3, the aeration tank 3 is communicated with the upflow aerobic tank 4 through a reaction tank water inlet pipe 9, the upper end of the reaction tank water inlet pipe 9 is communicated with the upper part of the aeration tank 3 and is a water inlet, and the lower end of the reaction tank water inlet pipe 9 extends into the bottom of the upflow aerobic tank 4. Through the aeration of aeration dish 8, the realization is to the oxygenation of sewage in aeration tank 3, and the sewage after the oxygenation can take place the inflation and rise for the sewage density of aeration tank 3 lower part reduces, pressure reduces, makes the water pressure of overflow pipe 7 bottom be greater than the water pressure of aeration tank 3 bottom, and the sewage in the effect of water pressure difference underflow pipe 7 flows into aeration tank 3 automatically, and the sewage in the oxygen deficiency pond 2 is mended into again wherein after the liquid level reduces in overflow pipe 7.
The liquid level of the sewage in the aeration tank 3 rises under the action of aeration, and the sewage in the aeration tank 3 flows into the upflow aerobic tank 4 through the water inlet pipe 9 of the reaction tank under the action of liquid level difference. Therefore, under the action of aeration, oxygenation and stirring are realized, a power source is provided for automatic circulation of sewage in the whole sewage treatment equipment, external circulation equipment is not needed, and energy consumption in the sewage treatment process is reduced.
The first water distribution device 10 is arranged at the bottom of the upflow aerobic tank 4, the first water distribution device 10 is composed of a plurality of water distribution main pipes 16 and water distribution branch pipes 17 arranged on the water distribution main pipes 16, the plurality of water distribution main pipes 16 are uniformly arranged, one end of each water distribution main pipe 16 is communicated with the part of the reaction tank water inlet pipe 9 extending into the upflow aerobic tank 4, and the other end is in a blocking state. The water distribution main pipe 16 is uniformly provided with a plurality of water distribution branch pipes 17, one end of each water distribution branch pipe 17 is communicated with the water distribution main pipe 16, and the other end of each water distribution branch pipe 17 is a downward water outlet, so that sewage at the upper part of the aeration tank 3 sequentially flows through the reaction tank water inlet pipe 9, the water distribution main pipe 16 and the water distribution branch pipes 17 and is finally discharged through the downward water outlets of the water distribution branch pipes 17, and downward water outlet not only can realize uniform water distribution, but also can disperse sludge settled to the bottom to prevent sludge from silting at the bottom.
The number of the overflow weirs 11 is multiple, the overflow weirs 11 are uniformly arranged on the upper part of the upflow aerobic tank 4, and the overflow weirs 11 are in a U-shaped groove shape with an opening at the upper end. The water collecting tank 5 is arranged above the upflow aerobic tank 4 on the opposite side of the reaction tank water inlet pipe 9, one end of the overflow weir 11 adjacent to the water collecting tank 5 is provided with a water through port 15, the other end is provided with a water outlet pipe 6 and an overflow port 14, the overflow weir 11 is communicated with the water collecting tank 5 through the water through port 15, the diameter of the water outlet pipe 6 is smaller than that of the return pipe 12, so as to ensure that the return flow is dozens of times to dozens of times of the water outlet flow, the overflow port 14 is positioned above the water outlet pipe 6, and when the water inlet amount is large, the overflow port. One end of the water collecting tank 5 close to the anoxic tank 2 is communicated with the anoxic tank 2 through a return pipe 12, a water inlet of the return pipe 12 is communicated with the water inlet tank 5, a water outlet end of the return pipe 12 is positioned at the bottom of the anoxic tank 2, a second water distribution device 13 is arranged at the bottom of the anoxic tank 2, and the second water distribution device 13 is communicated with a water outlet end of the return pipe 12 so as to uniformly distribute the sewage refluxed through the return pipe 12 to the bottom of the anoxic tank 2.
In the process that the sewage discharged by the first water distribution device 10 uniformly rises in the upflow aerobic tank 4, the sludge is distributed in a state that aerobic granular sludge with good sedimentation performance is on the lower part and flocculent sludge with poor sedimentation performance is on the upper part, so that the screening and the growth of the aerobic granular sludge are facilitated. In the process that the sewage rises in the upflow aerobic tank 4, aerobic microorganisms in the aerobic granular sludge consume dissolved oxygen in the water, ammonia nitrogen in the sewage is converted into nitrate nitrogen through nitration reaction, and organic matters in the water are oxidized and removed. The sewage at the upper part of the upflow aerobic tank 4 flows into the overflow weir 11 and flows into the water collecting tank 5 through the water opening 15 at the end part of the overflow weir 11, and meanwhile, flocculent sludge carried in the sewage also flows into the water collecting tank.
The bottom of the water collecting tank 5 and the water through opening 15 have a height difference, so that after sewage in the overflow weir 11 flows into the water collecting tank 5 through the water through opening 15, sludge in the sewage naturally settles under the action of gravity, and when the sewage settles to a certain thickness, the lower layer water flow carries the sludge to flow into the anoxic tank 2 through the return pipe 12. Because the diameter of the return pipe 12 is much larger than that of the water outlet pipe 6, the return flow of the sewage in the water inlet tank 5 through the return pipe 12 is much larger than the water outlet flow through the water outlet pipe 6, so as to ensure that the return flow is dozens of times to dozens of times of the water outlet flow, and realize the circular denitrification treatment of the sewage.
After flowing into the anoxic tank 2 through the return pipe 12, the sewage is mixed with the inlet water through the inlet pipe 1, and because ammonia nitrogen (part of ammonia nitrogen) in the return water is converted into nitrate nitrogen through nitration reaction and organic matters in the return water are removed, the anaerobic microorganisms in the anoxic tank 2 convert the nitrate nitrogen into nitrogen gas through denitrification by using the organic matters in the inlet water as energy, and the denitrification treatment of the sewage is realized. A DO probe for detecting the dissolved oxygen value is arranged in the anoxic tank 2, in order to ensure the anaerobic environment of the anoxic tank 2, the dissolved oxygen value in the anoxic tank is detected by the DO probe, and the dissolved oxygen in the anoxic tank is controlled to be below 0.5mg/L by controlling the aeration amount of the aeration disc 8. As the return flow of the sewage is dozens of times to dozens of times of the water yield, the sewage reaches the discharge standard after being circularly treated for dozens of times to dozens of times.
The upper end of the overflow pipe 7 and the upper end of the overflow weir 11 are shown as serrated to ensure even water entry and exit. In order to ensure a circulating flow of sewage throughout the sewage treatment plant, the position of the drainage opening 14 is shown to be highest, followed by the position of the outlet pipe 6, followed by the position of the inlet of the overflow pipe 7 and the position of the inlet of the overflow weir 11, and finally the position of the inlet of the return pipe 12. In order to reduce the head loss to the maximum extent, the inner diameter of the inlet pipe 9 of the reaction tank at any time is not less than 200 mm.
The ascending flow rate in the anoxic tank 2 and the ascending flow aerobic tank 4 is determined by the aeration amount in the aeration tank 3, the larger the aeration amount is, the larger the ascending flow rate is, the ascending flow rate determines the expansion height of the sludge, the flocculent sludge with poor settling property can be discharged along with water flow, the granular sludge with good settling property is stored in the tanks, namely, the control of the ascending flow rate can be used for separating the granular sludge from the flocculent sludge. At the initial stage of equipment operation, more flocculent sludge is in the equipment, the water inflow can be reduced, and the sludge loss is reduced; after long-term operation, the suspended sludge in the upflow aerobic tank 4 is very little. The sludge with poor sedimentation performance contained in the return water is broken through a large amount of aeration, and can enter the bottom of the upflow aerobic tank 4 again and be attached to the granular sludge at the bottom, so that the formation of the granular sludge and the increase of the grain diameter of the granular sludge are promoted.
Claims (8)
1. A separated aeration self-circulation two-section denitrification integrated sewage treatment device comprises a water inlet pipe (1), an anoxic tank (2), an aeration tank (3), an upflow aerobic tank (4), a water collecting tank (5) and a water outlet pipe (6), wherein the water inlet pipe is communicated with the anoxic tank, and sewage to be treated flows into the anoxic tank through the water inlet pipe; the water outlet pipe is communicated with the upper part of the water collecting tank, and the treated sewage is discharged through the water outlet pipe; a plurality of aeration discs (8) are arranged at the bottom of the aeration tank; the method is characterized in that: an overflow pipe (7) is arranged in the anoxic tank, an inlet of the overflow pipe is communicated with the upper part of the anoxic tank, and an outlet of the overflow pipe is communicated with the bottom of the aeration tank; the aeration tank is communicated with the upflow aerobic tank through a reaction tank water inlet pipe (9), the inlet of the reaction tank water inlet pipe is communicated with the upper part of the aeration tank, the outlet extends to the bottom of the upflow aerobic tank, the bottom of the upflow aerobic tank is provided with a first water distribution device, the first water distribution device is communicated with the outlet of the reaction tank water inlet pipe, and the first water distribution device is uniformly provided with downward water distribution ports; the water collecting tank is positioned at the upper part of the upflow aerobic tank, the upper part of the upflow aerobic tank is provided with a plurality of overflow weirs (11) which are distributed at intervals, the upper ends of the overflow weirs are opened, the end parts of the overflow weirs are provided with water through ports (15) which are communicated with the water collecting tank, the water collecting tank is communicated with the anoxic tank through a return pipe (12), the upper end of the return pipe is communicated with the water collecting tank, the lower end of the return pipe extends into the anoxic tank, the anoxic tank is internally provided with a second water distribution device (13), and the second water distribution device is communicated with; aerobic sludge and anaerobic sludge are respectively cultured in the upflow aerobic tank and the anoxic tank, and a DO probe for detecting the dissolved oxygen value is arranged in the anoxic tank.
2. The separate aeration self-circulation two-stage denitrification integrated sewage treatment equipment according to claim 1, which is characterized in that: the water inlets at the upper ends of the overflow pipe (7) and the overflow weir (11) are both continuous zigzag, and the heights of the overflow pipe and the water inlet at the upper end of the overflow weir are equal; the inner diameter of the water outlet pipe (6) is smaller than that of the return pipe (12), the position of the water outlet pipe is higher than the overflow weir (11), and the position of the overflow weir is higher than the inlet of the return pipe.
3. The separate aeration self-circulation two-stage denitrification integrated sewage treatment equipment according to claim 1 or 2, which is characterized in that: the first water distribution device is composed of a plurality of water distribution main pipes (16) and a plurality of water distribution branch pipes (17) which are arranged on the water distribution main pipes, one end of each water distribution main pipe is communicated with the water inlet pipe (9) of the reaction tank, one end of each water distribution branch pipe is communicated with the water distribution main pipe, and the other end of each water distribution branch pipe is a water outlet facing downwards.
4. The separate aeration self-circulation two-stage denitrification integrated sewage treatment equipment according to claim 1 or 2, which is characterized in that: the upper part of the water outlet pipe (6) is provided with an overflow port (14) which is communicated with the water collecting tank.
5. The separate aeration self-circulation two-stage denitrification integrated sewage treatment equipment according to claim 1 or 2, which is characterized in that: the bottom of the water collecting tank (5) has a height difference with the water through opening (15).
6. A sewage treatment method based on the separated aeration self-circulation two-stage denitrification integrated sewage treatment equipment of claim 1 is characterized by comprising the following steps:
a) the sewage to be treated flows into an anoxic tank through a water inlet pipe, anaerobic microorganisms in the sludge in the anoxic tank use organic matters in the water as energy sources, and nitrate nitrogen in the water flowing back through a return pipe is converted into nitrogen to be removed, so that sewage denitrification is realized;
b) aeration and self-circulation, under the aeration action of an aeration disc at the bottom of the aeration tank, the sewage at the bottom of the aeration tank is oxygenated, the aerated sewage expands and rises, so that the density of the sewage at the bottom of the aeration tank is reduced, the water pressure is reduced, and the sewage in the anoxic tank flows into an upflow aerobic tank through an overflow pipe under the action of the water pressure difference; the liquid level of the sewage in the aeration tank rises due to aeration expansion, and the sewage in the aeration tank flows into the upflow aerobic tank through the water inlet pipe of the reaction tank under the action of the liquid level difference; the aeration of the aeration disc realizes the self-circulation flow of the sewage without external power;
c) water distribution and aerobic reaction, wherein sewage flowing in through a water inlet pipe of the reaction tank uniformly flows downwards under the water distribution action of the first water distribution device, and the sludge settled to the bottom is dispersed by utilizing the downwards-flowing water to prevent the sludge from depositing at the bottom; in the process that the sewage flowing into the upflow aerobic tank uniformly rises from bottom to top, aerobic granular sludge with good sedimentation performance is distributed in a state that flocculent sludge with poor sedimentation performance is on the bottom and flocculent sludge with poor sedimentation performance is on the top, aerobic microorganisms in the aerobic granular sludge are fully contacted with the sewage, ammonia nitrogen in the sewage is converted into nitrate nitrogen by consuming dissolved oxygen in the water, and organic matters in the water are removed;
d) discharging and refluxing, wherein sewage on the upper part of the upflow aerobic tank after aerobic reaction treatment flows into a water collecting tank through an overflow weir, flocculent sludge flowing along with the sewage is precipitated to the bottom of the water collecting tank, most of the sewage in the water collecting tank flows back to the anoxic tank through a return pipe, and supernatant is discharged through a water outlet pipe;
e) sewage circulation, namely performing denitrification on the sewage flowing back through the return pipe in an anoxic tank through anaerobic reaction to remove nitrate and nitrogen in the return water; the sludge in the return water participates in the formation of anaerobic sludge in the anoxic tank, the dissolved oxygen value in the anoxic tank is detected by a DO probe, and the dissolved oxygen in the anoxic tank is controlled to be below 0.5mg/L by controlling the aeration amount of an aeration disc; and (3) mixing the return water with the sewage, and then, introducing the mixture into the upflow aerobic tank for treatment, and performing reciprocating circulation in such a way to realize the denitrification treatment of the sewage.
7. The sewage treatment method of the separate aeration self-circulation two-stage denitrification integrated sewage treatment equipment according to claim 6, which is characterized in that: in the initial stage of sewage treatment, in order to promote the formation and growth of aerobic granular sludge in the upflow aerobic tank, the aeration quantity of the aeration disc is controlled not to be too large, so as to control the rising speed of water flow in the upflow aerobic tank and reduce sludge loss.
8. The sewage treatment method of the separate aeration self-circulation two-stage denitrification integrated sewage treatment equipment according to claim 6, which is characterized in that: in the water outlet and reflux steps in the step d), the sewage reflux amount is dozens of times to dozens of times of the water outlet amount so as to ensure the denitrification effect of the sewage.
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