CN112479499A - Multiphase vertical fluidization direct-current micro-oxygen internal circulation sewage treatment device - Google Patents
Multiphase vertical fluidization direct-current micro-oxygen internal circulation sewage treatment device Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 92
- 238000005243 fluidization Methods 0.000 title claims abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 title claims description 20
- 239000001301 oxygen Substances 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 238000005192 partition Methods 0.000 claims abstract description 67
- 238000003756 stirring Methods 0.000 claims abstract description 48
- 238000005273 aeration Methods 0.000 claims abstract description 34
- 238000004062 sedimentation Methods 0.000 claims abstract description 19
- 238000001556 precipitation Methods 0.000 claims abstract description 17
- 239000008213 purified water Substances 0.000 claims abstract description 10
- 239000010802 sludge Substances 0.000 claims description 49
- 239000007788 liquid Substances 0.000 claims description 25
- 230000001546 nitrifying effect Effects 0.000 claims description 21
- 238000007790 scraping Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 12
- 229910052698 phosphorus Inorganic materials 0.000 description 12
- 239000011574 phosphorus Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 238000010992 reflux Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 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 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 238000005842 biochemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- 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
Abstract
The invention discloses a multiphase vertical fluidization direct-current micro-aerobic internal circulation sewage treatment device, which comprises a cylinder, three partition plates and an aeration device, wherein the cylinder is provided with a water inlet and a water outlet; the three partition plates are sequentially fixed in the barrel from bottom to top, and divide the barrel into four areas, namely an anaerobic area, an anoxic area, an aerobic area and a precipitation area from bottom to top; rotatable stirring pieces are arranged in the anaerobic zone and the anoxic zone; the aeration device is arranged in the aerobic zone and is used for ventilating the aerobic zone; a sewage inlet is formed in the side wall of the barrel positioned in the anaerobic zone, an anaerobic zone water outlet is formed in a partition plate between the anaerobic zone and the anoxic zone, an anoxic zone water outlet is formed in a partition plate between the anoxic zone and the aerobic zone, an aerobic zone water outlet is formed in a partition plate between the aerobic zone and the sedimentation zone, and a purified water outlet is formed in the side wall of the barrel positioned in the sedimentation zone; the three clapboards are obliquely arranged relative to the bottom surface of the horizontal cylinder body, and the oblique directions of the two adjacent clapboards are opposite. The invention has the advantages of high DO utilization rate, low operation cost, small occupied area and the like.
Description
Technical Field
The invention belongs to the field of sewage treatment, relates to a sewage treatment device, and particularly relates to a multiphase vertical fluidization direct-current micro-oxygen internal circulation sewage treatment device.
Background
More and more areas are increasing the sewage discharge standard to relieve the pressure of urban sewage on the environment. However, large scale construction of sequencing batch biological reaction zone (SBR), anaerobic/anoxic/aerobic (A)2O), etc. can complete the effect of nitrogen and phosphorus removal, but has the defect difficult to overcome in the actual operation.
First, the conventional sewage treatment process has a low utilization rate of Dissolved Oxygen (DO). For the oxidation ditch process adopting the rotary brush aeration tank, the utilization rate of DO is only about 20% due to the excessively low aeration power. In order to improve the utilization rate of DO, application patent No. CN201922375764.X provides a sewage treatment air blast oxygen supply system, and the device aerates the aerobic tank through setting up three roots fans, has guaranteed that the oxygen suppliment is sufficient, but makes aeration equipment energy consumption too big, is unfavorable for energy saving. And application patent number CN201922164419.1 has proposed a waste water treatment aeration equipment, and the device has designed solid ladder piece to the waste water drainage, realizes cutting apart the contact many times of waste water and air through gravity, but system architecture is complicated, is unfavorable for doing extensive application in sewage treatment plant. Therefore, it is highly desired to develop a sewage treatment apparatus with high DO utilization rate.
Secondly, the conventional sewage treatment process requires high running costs. In the traditional sewage treatment process, in order to solve the problem of low contact rate between the denitrification phosphorus removal bacteria and the wastewater in the anaerobic tank and the anoxic tank, a plurality of groups of stirrers are often directly used for stirring the activated sludge with the sewage. For example, the application patent No. CN201921505486.9 proposes a stirring device used in sewage treatment, and the method improves the stirring efficiency by using two groups of electric stirring devices. Application patent number CN201921659967.5 has improved a sewage treatment agitated vessel, and the device utilizes a dwang, sets up auger and stirring rod respectively at the upper and lower end of dwang and improves the treatment effeciency of medicine and sewage, but the device coupling operation position is many, very easily breaks down in actual town sewage treatment, brings inconveniently for subsequent processing. Therefore, a sewage treatment apparatus operating at low cost is urgently required.
Finally, the increasingly stringent discharge standards require that new sewage treatment plants are continuously expanded or newly constructed sewage treatment plants directly construct complicated and various sewage treatment facilities, thereby resulting in an excessively large floor space of the sewage treatment plants. If A is adopted2In the sewage treatment plant of the/O process, because the concentration of the activated sludge in the biochemical reaction tank is relatively low, in order to ensure higher pollutant removal rate and stable water treatment effect, longer hydraulic retention time is needed, the plane size of the corresponding biochemical reaction tank is larger, and in addition, deep treatment structures such as a mixed reaction sedimentation tank, a filter tank and the like are added, the characteristic of large occupied area of the whole tank body is particularly obvious, and the engineering measure cost in project construction is also increased. Therefore, under the background of increasing land value of cities and towns, a sewage treatment process which occupies a small area of the ground and has stable water treatment efficiency is preferably selected and constructed.
Disclosure of Invention
The invention provides a multiphase vertical fluidization direct-current micro-oxygen internal circulation sewage treatment device, which aims to overcome the defects of low DO utilization rate, large operation cost, large occupied area and the like of a traditional sewage treatment plant in actual operation.
In order to achieve the above object, the present invention provides a multiphase vertical flow direct current micro-aerobic internal circulation sewage treatment device, which has the following characteristics: comprises a cylinder body, three clapboards and an aeration device; the three partition plates are sequentially fixed in the barrel from bottom to top, and divide the barrel into four areas, namely an anaerobic area, an anoxic area, an aerobic area and a precipitation area from bottom to top; rotatable stirring pieces are arranged in the anaerobic zone and the anoxic zone; the aeration device is arranged in the aerobic zone and is used for ventilating the aerobic zone; a sewage inlet is formed in the side wall of the barrel positioned in the anaerobic zone, an anaerobic zone water outlet is formed in a partition plate between the anaerobic zone and the anoxic zone, an anoxic zone water outlet is formed in a partition plate between the anoxic zone and the aerobic zone, an aerobic zone water outlet is formed in a partition plate between the aerobic zone and the sedimentation zone, and a purified water outlet is formed in the side wall of the barrel positioned in the sedimentation zone; sewage to be treated enters the anaerobic zone from the sewage inlet, then sequentially flows through the anoxic zone and the aerobic zone through the anaerobic zone water outlet, the anoxic zone water outlet and the aerobic zone water outlet, enters the precipitation zone, and is discharged from the purified water outlet after precipitation and purification are finished; the settling zone is also provided with a sludge outlet, the anaerobic zone is also provided with a sludge backflow inlet, phosphorus-containing sludge settled in the settling zone is discharged from the sludge outlet, part of the phosphorus-containing sludge flows back to the sludge backflow inlet and enters the anaerobic zone, and the other part of the phosphorus-containing sludge is discharged from the device; the aerobic zone is also provided with a nitrifying liquid outlet, the anoxic zone is also provided with a nitrifying liquid backflow inlet, part of sewage treated by the aerobic zone is discharged from the nitrifying liquid outlet, and the sewage flows back to enter the anoxic zone through the nitrifying liquid backflow inlet; the three partition plates are obliquely arranged relative to the bottom surface of the horizontal cylinder, and the oblique directions of the two adjacent partition plates are opposite; the sewage inlet is positioned on the side wall of the cylinder body at the same side of the lower end of the partition plate between the anaerobic zone and the anoxic zone; the water outlet of the anaerobic zone is positioned at the edge of the partition plate at the high end of the partition plate between the anaerobic zone and the anoxic zone; the water outlet of the anoxic zone is positioned at the edge of the partition plate at the high end of the partition plate between the anoxic zone and the aerobic zone; the water outlet of the aerobic zone is positioned at the edge of the partition plate at the high end of the partition plate between the aerobic zone and the precipitation zone; the purified water outlet is positioned on the side wall of the cylinder body at the same side of the lower end of the partition board between the aerobic zone and the sedimentation zone.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: wherein the volume ratio of the anaerobic zone to the anoxic zone to the aerobic zone to the precipitation zone is 1:4:5: 1.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: wherein, the aeration device is positioned on the side wall of the cylinder body at the same side of the lower end of the partition board between the anoxic zone and the aerobic zone and is positioned at the bottom of the aerobic zone, and the air outlet direction of the aeration device is consistent with the inclined direction of the partition board.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: wherein, the aeration device is a micro-aeration device.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: wherein the sedimentation zone is provided with a mud scraping device, is arranged on a partition plate between the aerobic zone and the sedimentation zone and has the same inclination direction with the aerobic zone; the sludge outlet is positioned on the side wall of the cylinder at the bottom end of the sludge scraping equipment.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: wherein, the sludge backflow inlet is positioned above the sewage inlet.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: wherein, the nitrifying liquid outlet is positioned on the side wall of the cylinder body at the same side of the lower end of the partition plate between the anoxic zone and the aerobic zone and is positioned at the top of the aerobic zone; the nitrifying liquid reflux inlet is positioned on the side wall of the cylinder body between the anaerobic zone and the anoxic zone, which is positioned at the same side as the high end of the partition plate, and is positioned at the bottom of the anoxic zone.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: wherein the stirring piece is a fan blade; the number of the fan blade groups in the anaerobic zone is twice that of the fan blade groups in the anoxic zone.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: the device also comprises stirring power equipment and a stirring shaft; the stirring power equipment is fixed on the top of the device; the stirring shaft is inserted into the barrel from top to bottom, the bottom end of the stirring shaft extends into the anaerobic zone, the top end of the stirring shaft is connected with stirring power equipment, a driver of the stirring power equipment rotates, and fan blades in the anaerobic zone and the anoxic zone are fixed on the stirring shaft and rotate along with the stirring shaft.
Further, the present invention provides a multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device, which can also have the following characteristics: wherein, the anaerobic zone water outlet and the aerobic zone water outlet are formed by uniformly distributing and arranging a plurality of water outlet holes penetrating through the partition plate.
The invention has the beneficial effects that: the invention provides a multiphase vertical fluidization direct-current micro-aerobic internal circulation sewage treatment device which adopts a partition plate and a blast aeration mode to generate micro-pressure to promote the utilization rate of DO. The buried upflow device is constructed, so that the floor area can be reduced, and water is in a fluidized state under the action of the baffle plate, and the contact of muddy water is effectively promoted. Compared with the prior art, the concrete advantages include:
compared with the traditional process, the novel process for removing nitrogen and phosphorus by a micro-aerobic fluidized buried mode is constructed, treatment equipment such as an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and other sewage treatment structures arranged on the same plane are omitted, and the occupied area is small;
the whole device utilizes a power stirring device, and compared with the traditional process, the operation cost is saved;
thirdly, water is in a turbulent flow state through the lateral micro-aerobic aeration of the aerobic zone, and micro-pressure internal circulation is provided under the action of the partition plate, so that the contact area of muddy water is effectively increased;
and fourthly, the vertical upflow device can be buried under the ground, so that natural heat preservation is realized in cold weather, and compared with the traditional sewage treatment device which is limited to the ground and is distributed on a plane, the underground natural heat preservation is beneficial to guaranteeing the activity of microorganisms, so that the device can obtain a certain treatment effect at low temperature.
Drawings
FIG. 1 is a schematic structural diagram of a multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in figure 1, the invention provides a multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device, which comprises a cylinder body 1, three partition plates 2 and an aeration device 3.
The three partition plates 2 are sequentially fixed in the barrel body 1 from bottom to top, the barrel body 1 is divided into four areas, and the anaerobic area A, the anoxic area B, the aerobic area C and the settling area D are sequentially arranged from bottom to top. Wherein the volume ratio of the anaerobic zone A, the anoxic zone B, the aerobic zone C and the precipitation zone D is 1:4:5: 1.
Rotatable stirring pieces 41 are arranged in the anaerobic zone A and the anoxic zone B. The aeration device 3 is installed in the aerobic zone C and aerates the aerobic zone C. The settling zone D has a mud scraping device 5, which is arranged on the partition 2 between the aerobic zone C and the settling zone D, and which is in line with the inclination thereof.
Specifically, the stirring member 41 is a fan blade. The number of the fan blade groups in the anaerobic zone A is twice that of the fan blade groups in the anoxic zone B, so that a higher level of mud water fluidization degree is obtained. The fan blades in the anoxic zone B are divided into two groups which are respectively positioned at the lower 1/4 position and the upper 1/4 position in the anoxic zone B.
The apparatus further comprises a stirring power device 42 and a stirring shaft 43. The stirring power device 42 is fixed on top of the apparatus. The stirring shaft 43 is inserted into the barrel body 1 from top to bottom, the bottom end of the stirring shaft extends into the anaerobic zone A, the top end of the stirring shaft is connected with stirring power equipment 42, a driver of the stirring power equipment 42 rotates, fan blades in the anaerobic zone A and the anoxic zone B are fixed on the stirring shaft 43 and rotate along with the stirring shaft, and stirring in different areas in the device is realized by one stirring device.
The side wall of the barrel body 1 positioned in the anaerobic zone A is provided with a sewage inlet 11, the partition plate 2 between the anaerobic zone A and the anoxic zone B is provided with an anaerobic zone water outlet 21, the partition plate 2 between the anoxic zone B and the aerobic zone C is provided with an anoxic zone water outlet 22, the partition plate 2 between the aerobic zone C and the sedimentation zone D is provided with an aerobic zone water outlet 23, and the side wall of the barrel body 1 positioned in the sedimentation zone D is provided with a purified water outlet 12.
Sewage to be treated enters the anaerobic zone A from the sewage inlet 11, then flows through the anoxic zone B and the aerobic zone C in sequence through the anaerobic zone water outlet 21, the anoxic zone water outlet 22 and the aerobic zone water outlet 23, enters the precipitation zone D, and is discharged from the purified water outlet 12 after precipitation and purification are finished.
The settling zone D also has a sludge outlet 13 and the anaerobic zone a also has a sludge return inlet 14. The phosphorus-containing sludge precipitated in the precipitation zone D is discharged from a sludge outlet 13, part of the phosphorus-containing sludge flows back to a sludge return inlet 14 to enter the anaerobic zone A, and the other part of the phosphorus-containing sludge is discharged from a device.
Specifically, the sludge outlet 13 is positioned on the side wall of the barrel 1 at the bottom end of the sludge scraping device 5. The sludge return inlet 14 is located above the sewage inlet 11 to facilitate thorough mixing of the relatively heavy sludge with the incoming sewage in the anaerobic zone.
In a preferred embodiment, the sewage inlet 11 is located 1-2cm above the bottom surface of the horizontal cylinder 1. The sludge return inlet 14 is positioned 0.5-1.5cm above the sewage inlet 11.
The aerobic zone C is also provided with a nitrifying liquid outlet 15, and the anoxic zone B is also provided with a nitrifying liquid reflux inlet 16. And part of the sewage treated in the aerobic zone C is discharged from a nitrifying liquid outlet 15, and flows back to enter the anoxic zone B through a nitrifying liquid backflow inlet 16.
Wherein, three baffle 2 all set up for the slope of horizontal barrel 1 bottom surface, and two adjacent baffle 2 inclined opposite direction.
Since each partition 2 is obliquely arranged, each partition 2 has a low end and a high end, which refer to the ends closest and farthest to the bottom of the cylinder 1, respectively.
The sewage inlet 11 is positioned on the side wall of the barrel 1 at the same side of the lower end of the partition board 2 between the anaerobic zone A and the anoxic zone B. The water outlet 21 of the anaerobic zone is positioned at the edge of the partition plate 2 at the high end of the partition plate 2 between the anaerobic zone A and the anoxic zone B. The water outlet 22 of the anoxic zone is positioned at the edge of the partition board 2 at the high end of the partition board 2 between the anoxic zone B and the aerobic zone C. The water outlet 23 of the aerobic zone is positioned at the edge of the partition board 2 at the high end of the partition board 2 between the aerobic zone C and the precipitation zone D. The purified water outlet 12 is positioned on the side wall of the cylinder 1 at the same side of the lower end of the clapboard 2 between the aerobic zone C and the sedimentation zone D.
The arrangement of the baffle plate 2, the sewage inlet 11, the sewage outlets and other structures can ensure that sewage can smoothly circulate in each area in the device, prevent the sewage from forming dead corners which cannot circulate in each corner, and further improve the sewage treatment efficiency.
In addition, the nitrifying liquid outlet 15 is positioned on the side wall of the cylinder 1 at the same side of the lower end of the partition plate 2 between the anoxic zone B and the aerobic zone C and is positioned at the top of the aerobic zone C. The nitrified liquid reflux inlet 16 is positioned on the side wall of the cylinder 1 at the same side of the high end of the partition plate 2 between the anaerobic zone A and the anoxic zone B and is positioned at the bottom of the anoxic zone B. The nitrified liquid reflux outlet 15 is arranged at the tail end of the aerobic zone C, so that the most nitrate nitrogen can be obtained, the denitrification can be better carried out, and the reflux amount can be reduced relative to other arrangement positions, so that the operation cost is reduced; the nitrifying liquid reflux inlet 16 is arranged at the bottom of the anoxic zone B, so that nitrate nitrogen can obtain longer existence time in the anoxic zone B, the treatment efficiency is improved, and the expected treatment efficiency is avoided by improving the internal circulation ratio. In a preferred embodiment, the nitrified liquid outlet 15 is located 1-2cm below the lower end of the partition 2 between the anoxic zone B and the aerobic zone C, and the nitrified liquid return inlet 16 is located 3-7cm above the upper end of the partition 2 between the anaerobic zone A and the anoxic zone B.
Wherein, aeration equipment 3 is located on the barrel 1 lateral wall of 2 low sides homonymies of baffle between anoxic zone B and the aerobic zone C to be located aerobic zone C's bottom, and aeration equipment 3's the direction of giving vent to anger is unanimous with this baffle 2's incline direction, thereby avoids the bubble directly to beat on baffle 2, improves aeration efficiency, has still improved aerobic zone C's stirring efficiency simultaneously, thereby optimizes aerobic zone C's treatment effect.
The aeration device 3 is a micro-aeration device. Wherein, the micro-aeration means that the diameter of air bubbles generated by aeration is 80-100 μm. The smaller the bubbles are, the larger the contact area with the muddy water is, and the treatment efficiency can be improved. The bubbles of the common aeration are in the centimeter level, the contact area of the muddy water and the air is small, and the utilization rate of the oxygen is low; micro-aeration can improve the utilization rate of oxygen.
Wherein, the anaerobic zone water outlet 21 and the aerobic zone water outlet 23 are formed by uniformly distributing and arranging a plurality of water outlet holes penetrating through the clapboard 2. In a preferred embodiment, the diameter of the water outlet holes is 1-1.5cm, the distance between the water outlet holes is 5-10mm, and the water outlet holes are arranged in 2-5 rows.
The water inlet mode of the multiphase vertical fluidization direct current micro-oxygen internal circulation sewage treatment device is that water is fed from the bottom and the top, and the device is a vertical plug flow type operation mode, the hydraulic retention time of the whole system is 10-15h, the sludge discharge period is 12-14d, and the MLSS concentration is 2700-3500 mg/L.
The sewage firstly enters the anaerobic zone A through the sewage inlet 11, and meanwhile, the phosphorus-containing sludge with the ratio of 60-90 percent which is returned from the settling zone D is also synchronously controlled to enter the anaerobic zone A at the bottom. At this time, the concentration of the sludge is 2700-. In addition, the stirring fan blades in the anaerobic zone A make the muddy water in a fluidized state. After the sewage treatment is finished, the sewage enters an anoxic zone B through an anaerobic zone water outlet 21 on the clapboard 2,
the water retention time of the sewage entering the anoxic zone B from the anaerobic zone A is controlled to be 2-4h, and the concentration of MLSS is 2800-3200 mg/L. The returned nitrifying liquid also synchronously enters an anoxic zone B, and the reflux ratio is 150-200%. The double number of the fan blade groups in the anoxic zone B realizes a higher level of fluidization degree of muddy water, and the water in the whole zone is in a fluidized state.
The sewage entering the aerobic zone C from the anoxic zone B is controlled to have hydraulic retention time of 6-8h and MLSS concentration of 3200-. An aeration device is arranged on the right side of the clapboard 2, fine bubbles are exposed through oblique micro-aeration to ensure that the water is in a fluidized state, and the DO concentration of the aerobic zone is 1-3 +/-0.5 mg/L. Part of the treated water enters the precipitation zone D through an aerobic zone water outlet 23 arranged on the partition board 2, and part of the treated water enters the anoxic zone B through the internal circulation of the nitrifying liquid.
The sewage entering the settling zone D from the aerobic zone C is purified, and the water flow is smooth and beneficial to sludge-water separation. In order to facilitate the sludge discharge, the sludge scraping equipment 5 is set to start to operate every 1-2 days, the operating time is 6-8h, the sludge discharge period is controlled at 12-14d, a part of discharged sludge is discharged as residual sludge, a part of sludge flows back to the anaerobic zone A, and the flowing back MLSS is 3500-4000 mg/L.
Example 1
Aiming at the problems of the traditional sewage treatment plant, a pilot test is provided, the device is an organic cuboid with the length of 30cm, the width of 20cm and the height of 60cm, the device is respectively provided with an anaerobic zone, an anoxic zone and an aerobic zone from bottom to top, and the volume ratio of the anaerobic zone to the anoxic zone to the aerobic zone is controlled to be 1:4:5:1 by using a partition plate, namely 3.3L of anaerobic zone, 13.2L of anoxic zone and 3L of 16.5L of aerobic settling zone.
The quality of inlet water is COD 165mg/L, ammonia nitrogen 32mg/L, TN 48mg/L, TP 3 mg/L.
After the whole system is inoculated, sewage and return sludge firstly enter an anoxic zone, phosphorus release and organic matter ammoniation are completed in the anoxic zone, and water flows to the anoxic zone in a fluidized state under the action of a stirrer. The nitrifying liquid returned from the aerobic zone synchronously enters the anoxic zone, the denitrification reaction is completed, nitrate nitrogen is converted into nitrogen, and water flows to the aerobic zone in a fluidized state under the action of the two stirring devices. The reaction functions of the aerobic zone are various, wherein the removal of organic matters, the absorption of phosphorus and the oxidation of ammonia nitrogen are all completed in the aerobic zone. And the sludge and water from the aerobic zone enter a settling zone, the sludge and water separation is completed, one part of sludge and water flows back to the anoxic zone, and the other part of sludge and water is discharged as residual sludge.
After treatment, the COD of the effluent is 20mg/L, the ammonia nitrogen is 1mg/L, TN is 12mg/L, and TP is 0.3 mg/L.
Claims (10)
1. The utility model provides a heterogeneous vertical fluidization direct current micro oxygen internal recycle sewage treatment plant which characterized in that:
comprises a cylinder body, three clapboards and an aeration device;
the three partition plates are sequentially fixed in the barrel from bottom to top, and divide the barrel into four areas, namely an anaerobic area, an anoxic area, an aerobic area and a precipitation area from bottom to top;
rotatable stirring pieces are arranged in the anaerobic zone and the anoxic zone;
the aeration device is arranged in the aerobic zone and is used for ventilating the aerobic zone;
a sewage inlet is formed in the side wall of the barrel positioned in the anaerobic zone, an anaerobic zone water outlet is formed in a partition plate between the anaerobic zone and the anoxic zone, an anoxic zone water outlet is formed in a partition plate between the anoxic zone and the aerobic zone, an aerobic zone water outlet is formed in a partition plate between the aerobic zone and the sedimentation zone, and a purified water outlet is formed in the side wall of the barrel positioned in the sedimentation zone;
sewage to be treated enters the anaerobic zone from the sewage inlet, then sequentially flows through the anoxic zone and the aerobic zone through the anaerobic zone water outlet, the anoxic zone water outlet and the aerobic zone water outlet, enters the precipitation zone, and is discharged from the purified water outlet after precipitation and purification are finished;
the sedimentation zone is also provided with a sludge outlet, the anaerobic zone is also provided with a sludge backflow inlet, sludge precipitated in the sedimentation zone is discharged from the sludge outlet, part of sludge flows back to the sludge backflow inlet and enters the anaerobic zone, and the other part of sludge is discharged from the device;
the aerobic zone is also provided with a nitrifying liquid outlet, the anoxic zone is also provided with a nitrifying liquid backflow inlet, part of sewage treated by the aerobic zone is discharged from the nitrifying liquid outlet, and the sewage flows back to enter the anoxic zone through the nitrifying liquid backflow inlet;
the three partition plates are obliquely arranged relative to the bottom surface of the horizontal cylinder, and the oblique directions of the two adjacent partition plates are opposite; the sewage inlet is positioned on the side wall of the cylinder body at the same side of the lower end of the partition plate between the anaerobic zone and the anoxic zone;
the water outlet of the anaerobic zone is positioned at the edge of the partition plate at the high end of the partition plate between the anaerobic zone and the anoxic zone;
the water outlet of the anoxic zone is positioned at the edge of the partition plate at the high end of the partition plate between the anoxic zone and the aerobic zone;
the water outlet of the aerobic zone is positioned at the edge of the partition plate at the high end of the partition plate between the aerobic zone and the precipitation zone;
the purified water outlet is positioned on the side wall of the cylinder body at the same side of the lower end of the partition board between the aerobic zone and the sedimentation zone.
2. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 1, which is characterized in that:
wherein the volume ratio of the anaerobic zone to the anoxic zone to the aerobic zone to the precipitation zone is 1:4:5: 1.
3. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 1, which is characterized in that:
the aeration device is positioned on the side wall of the barrel body between the anoxic zone and the aerobic zone, the side wall is positioned on the same side of the lower end of the partition plate, the aeration device is positioned at the bottom of the aerobic zone, and the air outlet direction of the aeration device is consistent with the inclination direction of the partition plate.
4. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 1, which is characterized in that:
wherein, the aeration device is a micro-aeration device.
5. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 1, which is characterized in that:
wherein the sedimentation zone is provided with a mud scraping device, is arranged on a partition plate between the aerobic zone and the sedimentation zone and has the same inclination direction with the aerobic zone;
the sludge outlet is positioned on the side wall of the cylinder at the bottom end of the sludge scraping equipment.
6. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 1, which is characterized in that:
wherein, the sludge backflow inlet is positioned above the sewage inlet.
7. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 1, which is characterized in that:
wherein the nitrifying liquid outlet is positioned on the side wall of the cylinder body at the same side of the lower end of the partition plate between the anoxic zone and the aerobic zone and is positioned at the top of the aerobic zone;
the nitrifying liquid backflow inlet is positioned on the side wall of the barrel body between the anaerobic zone and the anoxic zone, and is positioned at the bottom of the anoxic zone.
8. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 1, which is characterized in that:
wherein the stirring piece is a fan blade;
the number of the fan blade groups in the anaerobic zone is twice that of the fan blade groups in the anoxic zone.
9. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 8, characterized in that:
the device also comprises stirring power equipment and a stirring shaft;
the stirring power equipment is fixed on the top of the device;
the stirring shaft is inserted into the barrel from top to bottom, the bottom end of the stirring shaft extends into the anaerobic zone, the top end of the stirring shaft is connected with stirring power equipment, a driver of the stirring power equipment rotates, and fan blades in the anaerobic zone and the anoxic zone are fixed on the stirring shaft and rotate along with the stirring shaft.
10. The multiphase vertical fluidization direct current micro-aerobic internal circulation sewage treatment device according to claim 1, which is characterized in that:
the anaerobic zone water outlet, the anaerobic zone water outlet and the aerobic zone water outlet are formed by uniformly distributing and arranging a plurality of water outlet holes penetrating through the partition plate.
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| CN102139987A (en) * | 2010-01-29 | 2011-08-03 | 张文波 | Membrane bioreactor |
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