CN110104776B - Small-size sewage treatment integration equipment - Google Patents
Small-size sewage treatment integration equipment Download PDFInfo
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- CN110104776B CN110104776B CN201910465443.0A CN201910465443A CN110104776B CN 110104776 B CN110104776 B CN 110104776B CN 201910465443 A CN201910465443 A CN 201910465443A CN 110104776 B CN110104776 B CN 110104776B
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- 239000010865 sewage Substances 0.000 title claims abstract description 78
- 230000010354 integration Effects 0.000 title claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 159
- 238000004062 sedimentation Methods 0.000 claims abstract description 86
- 239000010802 sludge Substances 0.000 claims abstract description 85
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 76
- 239000011574 phosphorus Substances 0.000 claims abstract description 76
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000010992 reflux Methods 0.000 claims abstract description 62
- 230000001105 regulatory effect Effects 0.000 claims abstract description 37
- 239000000126 substance Substances 0.000 claims abstract description 11
- 238000005192 partition Methods 0.000 claims description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 238000005273 aeration Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 12
- 239000006228 supernatant Substances 0.000 claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 21
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 229910019142 PO4 Inorganic materials 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 6
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- 239000000203 mixture Substances 0.000 description 5
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- WHBMMWSBFZVSSR-UHFFFAOYSA-N 3-hydroxybutyric acid Chemical compound CC(O)CC(O)=O WHBMMWSBFZVSSR-UHFFFAOYSA-N 0.000 description 2
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- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
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- 238000005276 aerator Methods 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
Abstract
The invention relates to a small-sized integrated sewage treatment device, which comprises: the device comprises a tank body, a stirrer, a water inlet pump, a reflux pump II, a reflux pump III, a reflux pump IV and an air pump; the tank body is internally divided into a biological selection tank, an anaerobic tank, an anoxic tank I, an aerobic tank I, a grid regulating tank, an anoxic tank II, an aerobic tank II, a secondary sedimentation tank, a dephosphorization biological filter, a sludge concentration tank, a pre-dephosphorization tank, a phosphorus anaerobic sedimentation tank and a phosphorus chemical sedimentation tank from the center of the tank body to the wall of the tank body; compared with the traditional sewage treatment process equipment, the equipment provided by the invention has the advantages of load impact resistance, unattended operation, simplicity in maintenance, stability in water outlet, high integration level and low capital cost under the principle of ensuring that the water quality of the water reaches the standard.
Description
Technical Field
The invention belongs to the field of sewage treatment equipment, and particularly relates to small-sized integrated sewage treatment equipment.
Background
The development and improvement of the industrial, modern agriculture and people living standard create huge material wealth and bring serious pollution to water environment; along with the progress of sewage treatment technology, sewage treatment is gradually oriented to industries and villages with small sewage amount while solving the problem of large water environment pollution.
In order to ensure that the environment is protected while the economy is developed, the amount of sewage and wastewater generated by many industries such as hotels and ecological farms is very small, and serious pollution of a receiving water body (blackening and stinking of pond water and the like) can be caused by direct discharge without treatment; the village and town sewage treatment is mature, but the unplanned natural villages have scattered households, and in addition, places are severe in topography, and the villages and towns cannot be directly taken over to be treated by a sewage treatment station, so that point source sewage treatment facilities are built on site.
There are many sewage treatment processes, such as karusier oxidation ditch, CASS, SBR, AAO biochemical treatment, contact oxidation, MBR process, etc., in view of the above-mentioned treatment direction, the sewage and wastewater of small water volume relate to personnel's fluctuation condition, fluctuation condition of production, and the pollution concentration of the sewage and wastewater is high and low (the BOD of the influent water is low, the ammonia nitrogen, total nitrogen and total phosphorus are high), the fluctuation coefficient of the sewage and wastewater is large, the sewage and wastewater is treated by the above-mentioned conventional urban sewage treatment plant process, the treatment load is high and low, and the effluent water cannot stably reach the discharge standard.
In order to ensure that the sewage and wastewater treatment is stably discharged up to the standard and unattended, and meet the national policy requirements on water pollution control, in recent years, some domestic environmental protection enterprises develop a process suitable for treating sewage and wastewater with small water volume on the basis of the original process, such as: smart-sdt of He-Ji, china can, beijing Sande (Sande can technology), hunan Kai day A 2 O-MBBR, etc., several processes have been disclosed as follows:
aiming at the prior technology which is applicable to the treatment of sewage and wastewater with small water volume in China, the main problems are that:
1) Because the carbon-nitrogen ratio and the carbon-phosphorus ratio of the sewage and the wastewater are low, the fluctuation of the incoming water is large, and from the biochemical point of view, the total nitrogen and the total phosphorus are required to reach the first-level A standard, and the standard reaching is difficult under the condition of no medicine adding;
2) Additional dosing assistance is required, where operators need to be specialized and operational and to reside on site;
3) Basically, the air stripping mode is required to flow back, the flow back is unstable, and the air stripping type air stripping device is easy to block.
Disclosure of Invention
The invention aims to solve the technical problems of filling the defects of the prior art, providing small-sized sewage treatment integrated equipment which is suitable for the characteristics of small-sized sewage treatment and can realize stable standard-reaching emission and unattended operation.
For this purpose, the invention has the following specific scheme:
a compact integrated sewage treatment plant comprising: the device comprises a tank body, a stirrer, a water inlet pump, a reflux pump II, a reflux pump III, a reflux pump IV and an air pump;
a first baffle, a second baffle, a third baffle and a fourth baffle are arranged layer by layer from the center of the tank body to the wall of the tank body, a biological selection tank is arranged in the first baffle, an anaerobic tank is arranged between the first baffle and the second baffle, an anoxic tank I is arranged between the second baffle and the third baffle, an aerobic tank I is arranged between the third baffle and the fourth baffle, and a grid regulating tank, an anoxic tank II, an aerobic tank II, a secondary sedimentation tank, a dephosphorization biological filter tank, a sludge concentration tank, a pre-dephosphorization tank, a phosphorus anaerobic sedimentation tank and a phosphorus chemical sedimentation tank which are connected in sequence are divided between the fourth baffle and the wall of the tank;
a basket grid and an air stirring device are arranged in the grid regulating tank, and an equipment water inlet pipe is arranged on the tank wall where the grid regulating tank is positioned and extends into the basket grid;
the lower part of the second partition plate is provided with a water passing hole I, and the upper part of the third partition plate is provided with a water passing hole II; a water passing hole III is formed in the lower part of a fourth partition plate between the first aerobic tank and the second anoxic tank, and a water passing hole IV is formed in the upper part of a tank wall between the second anoxic tank and the second aerobic tank;
an aeration device is arranged in the first aerobic tank and the second aerobic tank; an overflow water outlet pipe of the second aerobic tank is arranged in the second aerobic tank;
the secondary sedimentation tank is a vertical flow sedimentation tank and comprises a water outlet weir, a central guide cylinder and a sludge collecting hopper; the center guide cylinder of the secondary sedimentation tank is communicated with the second overflow water outlet pipe of the aerobic tank;
the dephosphorization biological filter is internally provided with a water inlet area, a dephosphorization filter material area, an activated carbon filter material area and a water outlet area from top to bottom in sequence, wherein the water inlet area is connected with a water outlet weir of the secondary sedimentation tank through a pipeline, and a tank wall where the water outlet area is arranged is provided with an equipment water outlet pipe;
the lower part of the tank wall where the sludge concentration tank is positioned is provided with a device sludge discharge pipe, and a supernatant overflow pipe connected with the pre-dephosphorization tank is arranged in the sludge concentration tank;
the upper part of the pre-dephosphorization pool is provided with a pre-dephosphorization pool water outlet, and an air stirring device is arranged in the pre-dephosphorization pool;
the phosphorus anaerobic sedimentation tank is a vertical flow sedimentation tank and comprises a water outlet weir, a central guide cylinder and a sludge collecting hopper; the central guide cylinder of the phosphorus anaerobic sedimentation tank is connected with the water outlet of the pre-dephosphorization tank;
the phosphorus chemical sedimentation tank is a vertical flow sedimentation tank and comprises a central guide cylinder and a sludge collecting hopper; the water outlet weir of the phosphorus anaerobic sedimentation tank is connected with the central guide cylinder of the phosphorus sedimentation tank through a pipeline; an overflow water outlet pipe connected with the grid regulating tank is arranged in the phosphorus chemical sedimentation tank; the sludge collecting hopper of the phosphorus sedimentation tank is connected with a materialized sludge discharge pipe;
the stirrer is positioned above the tank body, and stirring paddles of the stirrer extend into the anaerobic tank, the anoxic tank I and the aerobic tank I respectively;
the inlet of the water inlet pump is connected with the grid regulating tank, and the outlet of the water inlet pump is respectively connected with the biological selection tank, the anoxic tank II, the pre-dephosphorization tank and the return pipe for regulating the flow to return to the grid regulating tank;
an inlet of the second reflux pump is connected with the second aerobic tank, and an outlet of the second reflux pump is connected with the second anoxic tank;
an inlet of the reflux pump III is connected with a sludge collecting hopper of the secondary sedimentation tank, and an outlet of the reflux pump III is respectively connected with the sludge concentration tank and the pre-dephosphorization tank;
the inlet of the reflux pump IV is connected with a sludge collecting hopper of the phosphorus anaerobic sedimentation tank, and the outlet of the reflux pump IV is respectively connected with a biological selection tank and a sludge reflux pipe for regulating the flow to return to the sludge collecting hopper of the phosphorus anaerobic sedimentation tank;
the outlet of the air pump is respectively connected with the aeration device of the first aerobic tank, the aeration device of the second aerobic tank, the air stirring device of the grid regulating tank and the air stirring device of the pre-dephosphorization tank.
Further, the tank body is a cylinder, and the first baffle, the second baffle, the third baffle and the fourth baffle are concentric annular baffles.
Further, a first equipment area is arranged above the grille regulating tank in the tank body; a second equipment area is arranged above the dephosphorization biological filter and the sludge concentration tank; the water inlet pump, the reflux pump II and the air pump are arranged in the first equipment area; and the reflux pump III and the reflux pump IV are arranged in the second area of the equipment.
Further, a lifting stirrer and a reflecting plate are arranged in the biological selection tank, the reflecting plate is arranged at the central lower part of the biological selection tank, and the surface area of the reflecting plate is smaller than the cross-sectional area of the biological selection tank.
Further, an overflow pipe is connected to the upper portion of the tank wall where the grid adjusting tank is located.
Further, an internal reflux weir gate is arranged on one side of the third baffle plate, which is positioned on the aerobic tank.
Further, a back flushing air pipe penetrating through the dephosphorization filter material area and the activated carbon filter material area is arranged in the dephosphorization biological filter, and the back flushing air pipe is connected with an air pump.
Further, the aeration device of the first aerobic tank and the aeration device of the second aerobic tank are both aeration discs arranged at the bottom of the tank; the air stirring device of the grid regulating tank and the air stirring device of the pre-dephosphorization tank are perforated aeration pipes arranged at the bottom of the tank.
Further, an ultrasonic liquid level meter is arranged in the grille adjusting pool; a water inlet flowmeter is arranged at the pipeline where the outlet of the water inlet pump is connected with the biological selection tank; and a water inlet flowmeter is arranged at the pipeline part of the outlet of the reflux pump IV, which is connected with the biological selection tank.
Further, the electric automatic control cabinet is positioned outside the tank body and used for monitoring equipment.
The invention has the beneficial effects that:
the invention has a treatment capacity of 1-5m 3 The integrated equipment is suitable for rural domestic sewage treatment with small water quantity, black and odorous water body treatment with small water quantity, high-speed service area sewage treatment with small water quantity, ecological farm sewage treatment, hotel domestic sewage treatment and the like.
The process composition of the integrated sewage and wastewater treatment equipment is as follows: grid regulation, bioselection, anaerobism, anoxic first, aerobic first, anoxic second, aerobic second, precipitation, dephosphorization device, sludge concentration, pre-dephosphorization, phosphorus anaerobic precipitation and phosphorus chemical precipitation. Wherein, the anaerobic, anoxic and aerobic processes form a common AAO process (the development of U.S. experts on the basis of the AO denitrification method in the 70 th century, english abbreviation:
(Anaerobic-anaxic-Oxic); anoxic two and aerobic two form a common AO denitrification process, and English is abbreviated as: (Anoxac-oxidation); the pre-dephosphorization device, the phosphorus anaerobic precipitation device and the phosphorus chemical precipitation device form a side flow process, and the main function is to generate 'lean phosphorus sludge', so that the 'lean phosphorus sludge' enters the second aerobic tank through the biological selection tank to fully absorb phosphorus, thereby deeply removing the total phosphorus in the sewage.
Through the process combination, the equipment has strong applicability, and can deeply remove organic matters, inorganic matters, total phosphorus, total nitrogen, ammonia nitrogen and escherichia coli in sewage and wastewater under the conditions of low influent carbon-nitrogen ratio (C: N < 4) and carbon-phosphorus ratio (C: P < 20) or under the conditions of the influent carbon-nitrogen ratio (C: N is more than or equal to 4) and the carbon-phosphorus ratio (C: P is more than or equal to 20), so that the sewage and wastewater is discharged up to the standard, and the effluent index of the integrated sewage and wastewater treatment equipment is controlled above the first-level A discharge standard of the pollutant discharge standard of urban sewage treatment plants in GB 18918-2002.
The integrated level of the device is extremely high, besides an external electric control system for personnel operation, a grid regulating tank, a biological selection tank, an anaerobic tank, an anoxic tank I, an aerobic tank I, an anoxic tank II, an aerobic tank II, a secondary sedimentation tank, a dephosphorization biological filter tank, a sludge concentration tank, a pre-dephosphorization tank, a phosphorus anaerobic sedimentation tank and a phosphorus chemical sedimentation tank are reasonably designed in a tank body, besides the device foundation, other civil construction structures are not needed to be additionally arranged, the appearance is attractive, the occupied area is saved, and the small water quantity industry and village and town installation requirements are fully met.
In summary, compared with the traditional sewage treatment process equipment, the equipment provided by the invention has the advantages of load impact resistance, unattended operation, simplicity in maintenance, stability in water outlet, high integration level and low capital cost under the principle of ensuring that the water quality of the water reaches the standard.
Drawings
FIG. 1 is an overall floor plan of the present invention;
FIG. 2 is a floor plan of the pool of the present invention;
FIG. 3 is a plan view of the device area of the present invention;
FIG. 4 is a schematic cross-sectional view of the structure 1-1 in FIG. 1;
FIG. 5 is a schematic cross-sectional view of the structure 2-2 in FIG. 1;
FIG. 6 is a schematic cross-sectional view of 3-3 of FIG. 1;
FIG. 7 is a schematic cross-sectional view of the structure of FIG. 1 at 4-4;
FIG. 8 is a schematic cross-sectional view of the structure 5-5 of FIG. 1;
FIG. 9 is a schematic cross-sectional view of the structure of FIG. 1 at 6-6;
FIG. 10 is a schematic cross-sectional view of the structure 7-7 of FIG. 1;
wherein: 1-tank, 101-first partition, 102-second partition, 103-third partition, 104-fourth partition, 2-stirrer, 3-water inlet pump, 4-reflux pump two, 5-reflux pump three, 6-reflux pump four, 7-air pump, 8-biological selection tank, 9-anaerobic tank, 10-anoxic tank one, 11-aerobic tank one, 12-grille adjustment tank, 13-anoxic tank two, 14-aerobic tank two, 15-secondary sedimentation tank, 151-water outlet weir, 152-central guide cylinder, 153-sludge hopper, 16-dephosphorization biological filter tank, 161-water inlet area, 162-dephosphorization filter material area, 163-activated carbon filter material area, 164-water outlet area, 165-backwash air pipe, 17-sludge concentration tank 18-pre-dephosphorization pool, 19-phosphorus anaerobic sedimentation pool, 191-water outlet weir, 192-center guide cylinder, 193-sludge collecting hopper, 20-phosphorus sedimentation pool, 201-center guide cylinder, 202-sludge collecting hopper, 21-basket grid, 22-perforated aeration pipe, 23-equipment water inlet pipe, 24-lifting stirrer, 25-reflecting plate, 26-water hole I, 27-water hole II, 28-water hole III, 29-water hole IV, 30-aeration disc, 31-aerobic pool two overflow water outlet pipe, 32-pipeline, 33-pipeline, 34-equipment water outlet pipe, 35-equipment sludge discharge pipe, 36-supernatant overflow pipe, 37-pre-dephosphorization pool water outlet hole, 38-perforated aeration pipe, 39-pipeline, 40-pipeline, 41-overflow water outlet pipe, 42-materialized mud discharging pipe, 43-equipment first area, 44-equipment second area, 45-pipeline, 46-pipeline, 47-pipeline, 48-pipeline, 49-return pipe, 50-pipeline, 51-pipeline, 52-mud feeding pipe, 53-surplus mud pipe, 54-mud return pipe, 55-phosphorus-poor mud feeding pipe, 56-mud return pipe, 57-mud return pipe, 58-overflow pipe, 59-internal return weir gate and 60-water passing hole.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Referring to fig. 1 to 10, a small-sized sewage treatment integrated apparatus includes: tank 1, agitator 2, intake pump 3, reflux pump two 4, reflux pump three 5, reflux pump four 6 and air pump 7.
The can 1 may be any shape, and in this embodiment, a cylindrical can is taken as an example.
The inside of the tank body 1 is provided with a first partition board 101, a second partition board 102, a third partition board 103 and a fourth partition board 104 layer by layer from the center of the tank body to the tank wall, and the four layers of partition boards are concentric annular partition boards.
The interior of the first partition board 101 is provided with a biological selection tank 8, an anaerobic tank 9 is arranged between the first partition board 101 and the second partition board 102, an anoxic tank 10 is arranged between the second partition board 102 and the third partition board 103, an aerobic tank 11 is arranged between the third partition board 103 and the fourth partition board 104, and a grid regulating tank 12, an anoxic tank 13, an aerobic tank 14, a secondary sedimentation tank 15, a dephosphorization biological filter 16, a sludge concentration tank 17, a pre-dephosphorization tank 18, a phosphorus anaerobic sedimentation tank 19 and a phosphorus chemical sedimentation tank 20 which are sequentially connected are divided between the fourth partition board 104 and the tank wall.
A basket grille 21 is suspended in the grille adjusting tank 12, and a perforated aeration pipe 22 is arranged at the bottom of the grille adjusting tank 12 and used as an air stirring device; the tank wall where the grid regulating tank 12 is located is provided with an equipment water inlet pipe 23, and the equipment water inlet pipe 23 extends into the basket grid 21.
The upper part of the tank wall where the grid regulating tank 12 is positioned is connected with an overflow pipe 58, and the overflow pipe has the functions of: in order to ensure that water does not spread in the first area 43 of the equipment above the grid regulator tank 12 when the system equipment is not operating properly, and thus the power equipment is submerged and damaged, the maximum liquid level in the grid regulator tank 12 can be controlled by the overflow pipe 58.
The biological selection tank 8 is internally provided with a lifting stirrer 24, the lifting stirrer 24 is an existing product (only a schematic diagram is shown in the figure, and specific structural personnel can refer to the prior art), and is commonly used in a high-density sedimentation tank system, and the main function is to accelerate and lift water to overflow into the anaerobic tank 9; preventing the mud-water mixture from being unevenly mixed in the bio-selection tank 8, resulting in precipitation of solids.
The bottom of the biological selection tank 8 is also fixed with a reflecting plate 25, the reflecting plate 25 is supported and fixed at the center of the biological selection tank 8 by more than two supporting rods, the surface area of the reflecting plate 25 is smaller than the cross section of the tank body of the biological selection tank 8, and the reflecting plate 25 is used for preventing water from directly bouncing out of the tank when the yielding water of front-end power equipment enters the biological selection tank 8, so the reflecting plate 25 is arranged to prevent the yielding water of the power equipment from bouncing out of the tank after blocking and transmitting through the reflecting plate 25, and the yielding water of the power equipment is uniformly and stably distributed.
The lower part of the second partition board 102 is provided with a first water passing hole 26; the upper part of the third partition plate 103 is provided with a second water passing hole 27; a third water passing hole 28 is formed in the lower part of the fourth partition plate 104 between the first aerobic tank 11 and the second anoxic tank 13; and a water passing hole IV 29 is arranged at the upper part of the tank wall between the anoxic tank II 13 and the aerobic tank II 14.
Preferably, the third partition plate 103 is provided with an internal reflux weir gate 59 on the side of the first aerobic tank 11, and the internal reflux weir gate 59 is used for automatically flowing the nitrified liquid of the first aerobic tank 11 into the first anoxic tank 10 to perform denitrification in cooperation with opening and closing the water holes 60 on the third partition plate 103.
An aeration disc 30 is arranged in each of the first aerobic tank 11 and the second aerobic tank 14; and a second overflow water outlet pipe 31 of the aerobic tank is arranged in the second aerobic tank 14.
The secondary sedimentation tank 15 is a vertical sedimentation tank, and the vertical sedimentation tank specifically refers to the prior art and comprises a water outlet weir 151, a central guide cylinder 152 and a sludge collecting hopper 153; the central guide cylinder 152 is communicated with the second overflow water outlet pipe 31 of the aerobic tank through a pipeline 32.
The dephosphorization biological filter 16 is internally provided with a water inlet area 161, a dephosphorization filter material area 162, an activated carbon filter material area 163 and a water outlet area 164 from top to bottom in sequence, the water inlet area 161 is connected with a water outlet weir 151 of the secondary sedimentation tank 15 through a pipeline 33, and the tank wall where the water outlet area 164 is arranged is provided with an equipment water outlet pipe 34.
In order to prevent the two filter material areas from being blocked after long-term use, a back flush air pipe 165 penetrating through the dephosphorization filter material area 162 and the activated carbon filter material area 163 can be arranged in the dephosphorization biological filter 16, and the back flush air pipe 165 can be a perforated aerator pipe.
The lower part of the tank wall where the sludge concentration tank 17 is arranged is provided with a device sludge discharge pipe 35, and a supernatant overflow pipe 36 connected with the pre-dephosphorization tank 18 is arranged inside the sludge concentration tank 17.
The upper part of the pre-dephosphorization pool 18 is provided with a pre-dephosphorization pool water outlet hole 37, and the bottom of the pre-dephosphorization pool 18 is provided with a perforated aeration pipe 38 serving as an air stirring device.
The phosphorus anaerobic sedimentation tank 19 is also a vertical flow sedimentation tank and comprises an effluent weir 191, a central guide cylinder 192 and a sludge collecting hopper 193; the central guide cylinder 192 is connected with the pre-dephosphorization pool water outlet hole 37 through a pipeline 39.
The phosphorus chemical sedimentation tank 20 is also a vertical flow sedimentation tank and comprises a central guide cylinder 201 and a sludge collecting hopper 202; the water outlet weir 191 of the phosphorus anaerobic sedimentation tank 19 is connected with the central guide cylinder 201 of the phosphorus sedimentation tank 20 through a pipeline 40; an overflow water outlet pipe 41 connected with the grid regulating tank 12 is arranged in the phosphorus sedimentation tank 20; a mud collecting hopper 202 of the phosphorus sedimentation tank 20 is connected with a materialized mud discharging pipe 42.
The stirrer 2 is fixed above the tank body 1, and stirring paddles of the stirrer 2 respectively extend into the anaerobic tank 9, the anoxic tank 10 and the aerobic tank 11.
In order to facilitate reasonable installation of equipment, referring to fig. 3, in this embodiment, an equipment first area 43 is disposed above the grille adjusting pool 12 in the tank 1; a second equipment area 44 is arranged above the dephosphorization biological filter 16 and the sludge concentration tank 17.
The water inlet pump 3, the reflux pump II 4 and the air pump 7 are arranged in the first equipment area 43; the third 5 and fourth 6 reflux pumps are mounted in the second zone 44 of the apparatus.
The inlet of the water inlet pump 3 is connected with the grid regulating tank 12 through a pipeline 45, the outlet of the water inlet pump 3 is respectively connected with the biological selection tank through a pipeline 46, a pipeline 47 is connected with the anoxic tank II 13, a pipeline 48 is connected with the pre-dephosphorization tank, and a return pipe 49 for regulating the flow to the grid regulating tank is arranged.
The inlet of the second reflux pump 4 passes through the grid regulating tank 12 and the bottom of the second anoxic tank 13 through a pipeline 50 to be connected with the second aerobic tank 14, and the outlet of the second reflux pump 4 is connected with the second anoxic tank 13 through a pipeline 51.
The inlet of the reflux pump III 5 is connected with a sludge collecting hopper 153 of the secondary sedimentation tank 15 through a sludge inlet pipe 52, and the outlet of the reflux pump III 5 is connected with the sludge concentration tank 17 through a residual sludge pipe 53 and is connected with the pre-dephosphorization tank 18 through a sludge return pipe 54.
The inlet of the reflux pump IV 6 is connected with a sludge hopper 193 of the phosphorus anaerobic sedimentation tank 19 through a phosphorus-lean sludge inlet pipe 55; the outlet of the reflux pump IV 6 is respectively connected with the biological selection tank 8 through a sludge reflux pipe 56, and a sludge reflux pipe 57 for regulating the flow rate to a sludge collecting hopper 193 of the phosphorus anaerobic sedimentation tank 19.
The outlet of the air pump 7 is respectively connected with the aeration devices (aeration disc 30) of the first aerobic tank 11 and the second aerobic tank 14 through an air passage, the air stirring device (perforated aeration pipe 22) of the grille adjusting tank 12, the air stirring device (perforated aeration pipe 38) of the pre-dephosphorizing tank 19 and the back flushing air pipe 165.
Meanwhile, for the convenience of monitoring, an ultrasonic liquid level meter can be arranged in the grille adjusting tank 12; a water inlet flowmeter is arranged at a pipeline where the outlet of the water inlet pump 3 is connected with the biological selection tank 8; a water inlet flowmeter is also arranged at the position of a pipeline connected with the biological selection tank 8 at the outlet of the reflux pump IV 6.
The pipelines or the air paths in the embodiment are all provided with corresponding electromagnetic valves for controlling on-off, and a person skilled in the art can determine specific installation positions according to requirements, so that the embodiment is not described in detail.
The embodiment also comprises an electric self-control cabinet which is positioned outside the tank body 1 and is used for monitoring equipment, wherein the electric self-control cabinet is not shown in the figure, and can be designed by referring to a common electric control cabinet, and a frequency converter, a PLC control unit module and various electric components are integrated.
The working principle of the invention is as follows:
the collected sewage and wastewater automatically flows into a grid regulating tank 12 in the equipment through a water outlet pipeline of a septic tank or an oil separation tank, the sewage and wastewater is pumped into a biological selection tank 8 by using a water inlet pump 3 after large suspended matters and homogeneous average quantity of the sewage and wastewater are removed in the tank, the growth rate and the quantity of filamentous bacteria are controlled according to a biological adsorption mechanism, and meanwhile, zoogloea microorganisms brought by the backflow of phosphorus-poor sludge of a phosphorus anaerobic sedimentation tank 19 are greatly propagated by using a reflux pump four 6 to become dominant strains.
The sewage and the activated sludge overflow from the upper part of the partition plate through the lifting stirrer 24 and enter the anaerobic tank 9 of the outer ring, the sewage stays in the anaerobic tank 9 for about 2 hours, and the sewage fully releases phosphorus in the unit by utilizing the organic carbon source of the inlet water; under anaerobic condition, the phosphorus accumulating bacteria can utilize energy generated by in-vivo phosphorus accumulating hydrolysis and intracellular glycolysis to convert Volatile Fatty Acid (VFA) in sewage into poly beta hydroxybutyric acid (PHB) for storage, and phosphorus is fully released in the process; the stirrer 2 stirs the muddy water completely in a mixed state.
The sewage and wastewater treated by the anaerobic tank 9 enters the next treatment unit, namely an anoxic tank I10 through a water hole I26 at the lower part of the anaerobic tank, the sewage and wastewater in the unit mainly flows into the anoxic tank I10 from the nitrified liquid of the aerobic tank I11 through an internal reflux weir gate 59 arranged in the aerobic tank I11, and denitrifying bacteria are used for denitrification treatment in the unit by utilizing an organic carbon source in the sewage and wastewater, so that nitrate is removed, and denitrification is completed; the inside of the unit is also provided with a stirrer 2, so that the muddy water is completely in a mixed state; the main parameters of the unit are: hrt=5.31 h.
The sewage and wastewater treated by the anoxic tank I10 automatically flows into the aerobic tank I11 through the water passing holes II 27 at the upper part of the anoxic tank I10; the sewage and wastewater complete the removal of organic matters, the nitrosation and the nitrification of ammonia nitrogen and the phosphorus-accumulating bacteria in the unit by utilizing the energy stored in the body to fully and excessively absorb phosphorus to form phosphate which is stored in the sludge, and the process mainly removes the organic matters, the ammonia nitrogen and the total phosphorus in the sewage and wastewater. The muddy water is completely in a mixed state by using the stirrer 2; the main parameters of the unit are: hrt=12 h.
The sewage and wastewater passing through the first aerobic tank 11 automatically flows into the second anoxic tank 13 unit through the third water passing hole 28 at the bottom of the first aerobic tank 11, and the second anoxic tank 13 not only is the sewage and wastewater from the first aerobic tank, but also is the raw sewage and wastewater (10% of water inflow) which is pumped by the water inlet pump 3 and is not treated by the front-end process, and the main functions are as follows: the organic carbon source in the raw sewage and wastewater which is not treated by the front-end process and the nitrifying liquid (conveyed by the reflux pump II 4) from the aerobic tank II 14 are utilized to further deeply denitrify in the anoxic tank II 13, so that the total nitrogen is stable and reaches the standard. In order to ensure that the muddy water in the unit is in a suspension state, the muddy water is stirred by utilizing the hydraulic action generated by sewage and wastewater pumped by the water inlet pump 3; the main parameters of the unit are: hrt=1 h.
The sewage and wastewater passing through the anoxic tank II 13 automatically flows into the aerobic tank II 14 unit through the water passing hole IV 29 of the anoxic tank II 13, and has the main functions that: the sewage and wastewater is subjected to deep nitrification reaction in a second unit of the aerobic tank, organic matters are removed, phosphorus is deeply absorbed, and nitrified liquid is pumped into a second anoxic tank 13 at the front end by a second reflux pump 4 for deep denitrification treatment; the main parameters of the unit are: hrt=2.5 h.
The sewage and wastewater treated by the second aerobic tank 14 automatically flows into the second sedimentation tank 15 unit through the second overflow water outlet pipe 31 of the aerobic tank, and has the main functions: the sewage and wastewater is subjected to solid-liquid separation (action of a vertical sedimentation tank) in a secondary sedimentation tank unit, supernatant fluid after mud-water separation of the secondary sedimentation tank 15 automatically flows into an effluent weir 151, and automatically flows into a dephosphorization biological filter 16 through a drainage pipeline of the effluent weir 151; activated sludge deposited by the bottom sludge hopper 153 is pumped into a sludge concentration tank 17 and a pre-dephosphorization tank 18 unit through a reflux pump III 5; the main parameters of the unit are: surface load = 0.6m/h.
Specifically, supernatant fluid after mud-water separation in the secondary sedimentation tank 15 automatically flows into the water outlet weir 151, and automatically flows into the dephosphorization biological filter 16 through a water outlet weir 151 drainage pipeline, and sewage and wastewater are adsorbed and filtered by two layers of filter materials in the dephosphorization biological filter unit to remove a small amount of phosphate and suspended matters in the sewage and wastewater; the sewage and wastewater is discharged by the water outlet pipe 34 of the equipment after being treated by the unit, and the chromaticity, turbidity and total phosphorus index of the discharged water completely reach the standards.
Considering that the blocking phenomenon can occur in the later operation, a backwash air pipe is arranged, 165 is automatically backwashed once every 7 days, and the dephosphorization filter material can be adoptedThe particle size of the dephosphorization filter material is 0.5-1.5mm, and the height of the dephosphorization filter material is 500mm; an anthracite activated carbon filter material is arranged below the dephosphorization filter material, the particle size is 0.8-1.8mm, and the height of the activated carbon filter material is 300mm; the main parameters of the unit are: filtration rate = 6m/h.
Pumping part of the residual sludge at the bottom of the secondary sedimentation tank 15 into a sludge concentration tank 17 unit periodically through a reflux pump III 5, separating mud from water in the unit by using a mud suction truck to pump the concentrated sludge through a device mud discharge port 35 at the bottom periodically, wherein the pumping time is 180 days; the supernatant liquid has a high phosphorus content and overflows into the pre-dephosphorization tank 18 through an overflow pipe.
Because the reflux pump III 5 pumps part of the residual sludge at the bottom of the secondary sedimentation tank 15 into a sludge concentration tank 17 unit, other residual sludge is pumped into a pre-dephosphorization tank 18 unit, and water (10% of water inflow) is fed into the tank from a water inlet pump 3 at different points, and because the content of phosphate in the residual sludge and nitrate nitrogen which is not completely removed is higher, denitrification is preferentially completed by utilizing an organic carbon source of the water fed at different points, and the tank mainly contains phosphate at the moment; the mud-water mixture enters the following phosphorus anaerobic sedimentation tank 20 units through an overflow pipeline of the pre-dephosphorization tank 18; in order to ensure that the muddy water is in a suspension state, an air stirring device is arranged in the pool and is started at regular time (every 3 hours, 2 minutes are started).
After the sludge-water mixture from the pre-dephosphorization pool 18 enters the phosphorus anaerobic sedimentation pool 19 unit through the overflow pipeline, the sludge-water is separated by the action of the central guide cylinder, the horn mouth and the reflecting plate of the vertical flow sedimentation pool, the longer the sedimentation time is, the higher the phosphorus content of supernatant fluid is under anaerobic environment, the lower the phosphorus content of sludge deposited at the bottom is, at the moment, the sludge at the bottom is called as 'phosphorus-poor sludge', so as to ensure the sludge concentration from the front biological selection pool 8 to the rear aerobic pool 14, 50 percent of the sludge at the bottom of the phosphorus anaerobic sedimentation pool 19 is pumped to the biological selection pool 8 through the reflux pump four 6, and the other 50 percent of the sludge is refluxed to the phosphorus anaerobic sedimentation pool 19 (the sludge-water mixture pumped by the reflux pump four is prevented from containing phosphate).
Supernatant fluid of the phosphorus anaerobic sedimentation tank 19 automatically flows into a phosphorus chemical sedimentation tank 20 through overflow weir, and calcium hydroxide solution is quantitatively added into the phosphorus sedimentation tank 19, wherein the adding amount is calcium ions: phosphate=2:1; the turbid water treated by lime dosing automatically flows into the grid regulating tank 12 through the overflow water outlet pipe, and the generated lime-containing sludge is discharged periodically (from a materialized sludge discharge port), so that the generated sludge is rich in phosphorus and can be reused as phosphate fertilizer.
The invention relates to small-sized sewage treatment integrated equipment which is introduced on the basis of no carbon source and is used for discharging total nitrogen and total phosphorus of effluent up to the standard under the conditions of large water quality fluctuation coefficient and high nitrogen and phosphorus through continuous field debugging and summarization on an activated sludge treatment method.
On the basis of the AAO process, a biological selection tank, a secondary AO process, a dephosphorization biological filter tank, a pre-dephosphorization tank, a phosphorus anaerobic sedimentation tank and a phosphorus sedimentation tank are additionally arranged; the sludge mixed liquid of the secondary sedimentation tank is prevented from directly entering the anaerobic tank to affect the phosphorus release, the sludge mixed liquid firstly completes denitrification in the pre-dephosphorization tank, and then the sludge of the phosphorus anaerobic sediment Chi Debu is pumped into the biological selection tank through the reflux pump IV, so that the concentration of the sludge at the front end is supplemented, and simultaneously, the denitrification and the phosphorus release are prevented from competing for carbon sources at the same time, and double-failure injury is avoided. At the moment, the sewage and wastewater treatment equipment can stably run and the effluent reaches the standard, so that the sewage and wastewater treatment equipment has load impact resistance and effluent stability; besides the advantages, the grid regulating tank is integrated, so that the engineering construction cost is reduced, and the method has the characteristics of low capital expenditure and high integration level; meanwhile, an electric automatic control cabinet can be arranged outside the tank body, a PLC program is arranged according to the process requirement and is transmitted to a remote client through data, so that a user can know the running condition and data of the equipment at any time and any place, and the automatic control cabinet has unattended operation and maintenance simplicity.
The following table shows specific practical cases of the invention and the existing equipment (all are small-sized integrated sewage treatment devices of 5 tons/day, the inflow water is rural domestic sewage at the same place, and the effluent indexes are all of level A), and the results are as follows:
from the comparison, the integrated equipment has obvious advantages in terms of construction cost, water outlet stability and personnel operation level.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention. The scope of the invention is therefore defined by the appended claims.
Claims (10)
1. A small-size sewage treatment integration equipment, its characterized in that: comprising the following steps: the device comprises a tank body, a stirrer, a water inlet pump, a reflux pump II, a reflux pump III, a reflux pump IV and an air pump;
a first baffle, a second baffle, a third baffle and a fourth baffle are arranged layer by layer from the center of the tank body to the wall of the tank body, a biological selection tank is arranged in the first baffle, an anaerobic tank is arranged between the first baffle and the second baffle, an anoxic tank I is arranged between the second baffle and the third baffle, an aerobic tank I is arranged between the third baffle and the fourth baffle, and a grid regulating tank, an anoxic tank II, an aerobic tank II, a secondary sedimentation tank, a dephosphorization biological filter tank, a sludge concentration tank, a pre-dephosphorization tank, a phosphorus anaerobic sedimentation tank and a phosphorus chemical sedimentation tank which are connected in sequence are divided between the fourth baffle and the wall of the tank;
a basket grid and an air stirring device are arranged in the grid regulating tank, and an equipment water inlet pipe is arranged on the tank wall where the grid regulating tank is positioned and extends into the basket grid;
the lower part of the second partition plate is provided with a water passing hole I, and the upper part of the third partition plate is provided with a water passing hole II; a water passing hole III is formed in the lower part of a fourth partition plate between the first aerobic tank and the second anoxic tank, and a water passing hole IV is formed in the upper part of a tank wall between the second anoxic tank and the second aerobic tank;
an aeration device is arranged in the first aerobic tank and the second aerobic tank; an overflow water outlet pipe of the second aerobic tank is arranged in the second aerobic tank;
the secondary sedimentation tank is a vertical flow sedimentation tank and comprises a water outlet weir, a central guide cylinder and a sludge collecting hopper; the center guide cylinder of the secondary sedimentation tank is communicated with the second overflow water outlet pipe of the aerobic tank;
the dephosphorization biological filter is internally provided with a water inlet area, a dephosphorization filter material area, an activated carbon filter material area and a water outlet area from top to bottom in sequence, wherein the water inlet area is connected with a water outlet weir of the secondary sedimentation tank through a pipeline, and a tank wall where the water outlet area is arranged is provided with an equipment water outlet pipe;
the lower part of the tank wall where the sludge concentration tank is positioned is provided with a device sludge discharge pipe, and a supernatant overflow pipe connected with the pre-dephosphorization tank is arranged in the sludge concentration tank;
the upper part of the pre-dephosphorization pool is provided with a pre-dephosphorization pool water outlet, and an air stirring device is arranged in the pre-dephosphorization pool;
the phosphorus anaerobic sedimentation tank is a vertical flow sedimentation tank and comprises a water outlet weir, a central guide cylinder and a sludge collecting hopper; the central guide cylinder of the phosphorus anaerobic sedimentation tank is connected with the water outlet of the pre-dephosphorization tank;
the phosphorus chemical sedimentation tank is a vertical flow sedimentation tank and comprises a central guide cylinder and a sludge collecting hopper; the water outlet weir of the phosphorus anaerobic sedimentation tank is connected with the central guide cylinder of the phosphorus sedimentation tank through a pipeline; an overflow water outlet pipe connected with the grid regulating tank is arranged in the phosphorus chemical sedimentation tank; the sludge collecting hopper of the phosphorus sedimentation tank is connected with a materialized sludge discharge pipe;
the stirrer is positioned above the tank body, and stirring paddles of the stirrer extend into the anaerobic tank, the anoxic tank I and the aerobic tank I respectively;
the inlet of the water inlet pump is connected with the grid regulating tank, and the outlet of the water inlet pump is respectively connected with the biological selection tank, the anoxic tank II, the pre-dephosphorization tank and the return pipe for regulating the flow to return to the grid regulating tank;
an inlet of the second reflux pump is connected with the second aerobic tank, and an outlet of the second reflux pump is connected with the second anoxic tank;
an inlet of the reflux pump III is connected with a sludge collecting hopper of the secondary sedimentation tank, and an outlet of the reflux pump III is respectively connected with the sludge concentration tank and the pre-dephosphorization tank;
the inlet of the reflux pump IV is connected with a sludge collecting hopper of the phosphorus anaerobic sedimentation tank, and the outlet of the reflux pump IV is respectively connected with a biological selection tank and a sludge reflux pipe for regulating the flow to return to the sludge collecting hopper of the phosphorus anaerobic sedimentation tank;
the outlet of the air pump is respectively connected with the aeration device of the first aerobic tank, the aeration device of the second aerobic tank, the air stirring device of the grid regulating tank and the air stirring device of the pre-dephosphorization tank.
2. A compact integrated sewage treatment plant according to claim 1, characterized in that: the tank body is a cylinder, and the first baffle, the second baffle, the third baffle and the fourth baffle are concentric annular baffles.
3. A compact integrated sewage treatment plant according to claim 1, characterized in that: an equipment area is arranged above the grid regulating tank in the tank body; a second equipment area is arranged above the dephosphorization biological filter and the sludge concentration tank; the water inlet pump, the reflux pump II and the air pump are arranged in the first equipment area; and the reflux pump III and the reflux pump IV are arranged in the second area of the equipment.
4. A compact integrated sewage treatment plant according to claim 1, characterized in that: the biological selection tank is internally provided with a lifting stirrer and a reflecting plate, the reflecting plate is arranged at the central lower part of the biological selection tank, and the surface area of the reflecting plate is smaller than the cross-sectional area of the biological selection tank.
5. A compact integrated sewage treatment plant according to claim 1, characterized in that: and an overflow pipe is connected to the upper part of the tank wall where the grid regulating tank is located.
6. A compact integrated sewage treatment plant according to claim 1, characterized in that: and an internal reflux weir gate is arranged on one side of the third partition plate, which is positioned on the aerobic tank.
7. A compact integrated sewage treatment plant according to claim 1, characterized in that: and a back flushing air pipe penetrating through the dephosphorization filter material area and the activated carbon filter material area is arranged in the dephosphorization biological filter, and the back flushing air pipe is connected with an air pump.
8. A compact integrated sewage treatment plant according to claim 1, characterized in that: the aeration device of the first aerobic tank and the aeration device of the second aerobic tank are both aeration discs arranged at the bottom of the tank; the air stirring device of the grid regulating tank and the air stirring device of the pre-dephosphorization tank are perforated aeration pipes arranged at the bottom of the tank.
9. A compact integrated sewage treatment plant according to claim 1, characterized in that: an ultrasonic liquid level meter is arranged in the grille adjusting pool; a water inlet flowmeter is arranged at the pipeline where the outlet of the water inlet pump is connected with the biological selection tank; and a water inlet flowmeter is arranged at the pipeline part of the outlet of the reflux pump IV, which is connected with the biological selection tank.
10. A compact integrated sewage treatment plant according to claim 1, characterized in that: the automatic control tank also comprises an electric automatic control cabinet which is positioned outside the tank body and used for monitoring equipment.
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