CN112759201A - Self-maintenance sewage treatment integrated equipment and sewage treatment method thereof - Google Patents
Self-maintenance sewage treatment integrated equipment and sewage treatment method thereof Download PDFInfo
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- CN112759201A CN112759201A CN202110057369.6A CN202110057369A CN112759201A CN 112759201 A CN112759201 A CN 112759201A CN 202110057369 A CN202110057369 A CN 202110057369A CN 112759201 A CN112759201 A CN 112759201A
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- 239000010865 sewage Substances 0.000 title claims abstract description 39
- 238000012423 maintenance Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 239000010802 sludge Substances 0.000 claims abstract description 19
- 230000001546 nitrifying effect Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 238000005273 aeration Methods 0.000 claims description 18
- 238000004062 sedimentation Methods 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 238000010992 reflux Methods 0.000 claims description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- 238000011001 backwashing Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 230000035939 shock Effects 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 5
- 230000010354 integration Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 206010021143 Hypoxia Diseases 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—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
- C02F2101/16—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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses self-maintenance sewage treatment integrated equipment and a sewage treatment method thereof, and the equipment comprises a filter bed in a reactor main body, and a water inlet pipe and a siphon drain pipe which extend into the lower part of the filter bed, wherein the water inlet pipe is communicated with a gas stripping return pipe, the end part of the pipe orifice of the gas stripping return pipe is communicated with an inverted cone-shaped tank body, the inverted cone-shaped tank body vertically divides the reactor main body below the filter bed into a settling zone and an aerobic zone, the aerobic zone is internally provided with an anoxic zone separated by an anoxic denitrification tank, the upper part of the anoxic denitrification tank is communicated with the water inlet pipe, and the; the bottom of the reactor main body is provided with a sludge discharge pipe. The invention has compact structure, three areas are nested layer by layer, the volume utilization rate is improved, the heat dissipation is reduced, and the low-temperature treatment effect is enhanced; the filter bed is back-flushed by siphon drainage, so that the dry-wet alternate operation of the filter bed is realized, the pumpless backflow of nitrifying liquid and sludge is realized, and the operation and maintenance cost is reduced; the siphon drainage operation mode improves the shock resistance of the system, has self-maintenance capability and can realize unattended operation.
Description
Technical Field
The invention relates to the technical field of water treatment equipment, in particular to low-energy-consumption self-maintenance sewage treatment integrated equipment and a sewage treatment method thereof.
Background
In recent years, with the emphasis of the country on the water environment problem in rural areas, a large number of sewage treatment facilities are built in rural areas in China. The integrated equipment is widely used due to the advantages of high integration, small occupied area, convenient transportation, short construction period and the like. Patent 202010278347.8 discloses a small-size villages and small-size towns sewage treatment integration equipment, and it is including preliminary heavy edulcoration unit of preliminary treatment, biochemical nitrogen and phosphorus removal unit, membrane module degree of depth processing unit, clean water basin disinfection unit etc. has solved villages and small-size towns sewage treatment inefficiency, and low temperature environment operation unstability scheduling problem. Although the small-sized village and town sewage treatment integrated equipment has a good treatment effect, the whole system has high operation cost due to the fact that the small-sized village and town sewage treatment integrated equipment comprises a plurality of power consumption equipment such as a pulse water distribution pump, a reflux pump, a back flush pump, an aeration system, a membrane component system, a disinfection device and the like. In addition, patent 201910771888.1 also discloses a distributed sewage treatment integration equipment, and it includes the three region of oxygen deficiency case, good oxygen case, the setting tank that arranges in order, and oxygen deficiency pond and good oxygen pond hold biofilm carrier concurrently, and it adopts the mode of aeration air stripping backward flow to simplify the setting tank, have better COD, total nitrogen removal effect, the running cost is lower. Although the distributed sewage treatment integrated equipment is simple and can treat sewage, the distributed sewage treatment integrated equipment has the following defects: firstly, the anoxic tank, the aerobic tank and the sedimentation tank are independently arranged, so that the space utilization rate of the whole equipment is not high; secondly, additional aeration is needed for backflow, and the power of an aeration fan is increased; thirdly, the separation effect of the sedimentation tank is poor, and the phenomenon of high SS (suspended solid) of effluent possibly exists.
In the current integration technology, mostly just simply apply mechanically municipal sewage treatment process, mainly consider based on high integration and reduction occupation of land and construction cost, ubiquitous structure is complicated, and the consumer is many (especially electrical components equipment), and is with high costs, and the energy consumption is big, and operation and maintenance require high grade problem. Unlike the city, the countryside living in China is scattered, the capital, talents and technology are in short supply, and the laggard economic and technical level is not enough to support the normal operation of the existing equipment. Therefore, the phenomenon that the rural integrated equipment is idle soon after being built in China is very common.
In conclusion, on the premise of ensuring that the effluent reaches the standard, the integrated equipment is simplified, the number of electric equipment is reduced as much as possible, the maintenance requirement is reduced, the operation cost is reduced, and the method becomes a key point and a difficult point for solving the rural sewage treatment.
Disclosure of Invention
Aiming at the problems of the integrated equipment in China, the invention aims to provide the integrated equipment and the method for self-maintenance sewage treatment, which are used for backwashing the filter bed through siphon drainage so as to realize the dry-wet alternate operation and the self-maintenance capability of the filter bed; three areas are nested layer by layer, so that the volume utilization rate is improved, the heat dissipation is reduced, and the low-temperature treatment effect is enhanced; realizes the return of nitrifying liquid and the return of sludge, and improves the shock resistance of the system.
The purpose of the invention is realized by the following technical scheme.
A self-maintenance sewage treatment integrated device comprises a reactor main body, wherein a filter bed is arranged in the reactor main body, a water inlet pipe and a siphon drain pipe which extend into the lower part of the filter bed are arranged along the side wall of the reactor main body, the water inlet pipe is communicated with a gas stripping return pipe, the end part of the pipe orifice of the gas stripping return pipe is communicated with an inverted cone-shaped tank body, the reactor main body below the filter bed is vertically divided into a settling zone and an aerobic zone by the inverted cone-shaped tank body, the aerobic zone is internally provided with an anoxic zone which is divided by an anoxic denitrification tank, the upper part of the anoxic denitrification tank is communicated with the; the bottom of the reactor main body is provided with a sludge discharge pipe.
Preferably, the anoxic denitrification tank is arranged at the bottom of the reactor main body, and a water outlet at the bottom of the anoxic zone is communicated with the aerobic zone; the bottom of the sedimentation zone is communicated with the aerobic zone for the concentrated sludge in the sedimentation zone to automatically flow back to the aerobic zone.
Preferably, the aerobic zone is internally provided with a suspended filler and a jet aeration pump, and a water outlet of the jet aeration pump is arranged along the tangential direction of the inner cylinder wall of the aerobic zone.
Preferably, the wall of the conical tank body between the aerobic zone and the sedimentation zone is provided with a small hole which is a water outlet of the aerobic zone.
As a further preference, an air release pipe is connected above the top of the air stripping return pipe.
Preferably, the siphon drain pipe comprises a vertical pipe, a horizontal pipe and a U-shaped water storage pipe which are sequentially connected, wherein the vertical pipe penetrates through the filter bed through a siphon sleeve to be communicated with the sedimentation area, a gas electromagnetic valve is arranged at the upper end of the U-shaped water storage pipe, a liquid level valve is arranged in the siphon sleeve and connected with the electromagnetic valve through a lead as further preference, and a water outlet pipe is arranged above the horizontal pipe of the siphon drain pipe.
Preferably, the height of the transverse pipe of the gas stripping return pipe communicated with the water inlet pipe is not lower than that of the water outlet pipe.
The invention further provides a low-energy consumption self-maintenance integrated sewage treatment method of the equipment, which comprises the following steps:
the pretreated sewage enters an anoxic zone for anoxic denitrification after being converged by a water inlet pipe and a nitrifying liquid from the aerobic zone through a gas stripping return pipe;
carrying out mud-water separation on effluent from the aerobic zone in a precipitation zone, discharging supernatant after passing through a filter bed, and returning concentrated sludge to the aerobic zone;
the residual sludge-water mixed liquid in the aerobic zone enters a settling zone through a water outlet of the aerobic zone, the sludge returns to the aerobic zone again after sinking, and the supernatant rises and is exuded through a filter bed;
the water level of a siphon sleeve penetrating through the filter bed rises to a set water level, a siphon drain pipe conducts siphon drainage, and the water flow direction of the filter bed is downward to complete backwashing;
according to the water inflow and the concentration of COD, ammonia nitrogen, total nitrogen and total phosphorus of the inflow, the COD, ammonia nitrogen, total nitrogen and total phosphorus in the sewage are removed by adjusting the water-gas ratio, the gas stripping reflux and the sludge age.
The invention has the beneficial effects that:
in the invention, the gas in the aerobic tank is collected at the top of the cone and is used for stripping and refluxing the nitrified liquid, and in addition, the concentrated sludge in the settling zone can automatically fall back to the aerobic zone, so that a reflux pump is not needed, only one jet aeration pump is needed in the operation process of the reactor, and the operation and maintenance cost of the system is greatly reduced.
In the invention, the anoxic zone, the aerobic zone and the sedimentation zone are nested layer by layer, the outer sedimentation zone is equivalent to a heat insulation layer, and the heat generated in the biochemical zone is not easy to lose in the process of sewage treatment, thereby ensuring the low-temperature treatment effect.
According to the invention, through the siphon drainage arrangement, the dry-wet alternative operation of the filter bed can be realized, and the microorganisms of the filter bed are in an aerobic-anaerobic alternative environment, so that the denitrification of the wastewater is facilitated. And the siphon drainage operation mode is used for backwashing the filter tank, so that the blockage of the filter bed is reduced. The shock resistance of the system is improved, the self-maintenance capability is realized, and unattended operation can be realized.
According to the invention, the filter bed is positioned at the uppermost part in the reactor, the self-maintenance of the filter bed can be realized through the siphon drainage system, when the filter bed is blocked, only simple manual dredging is needed, the maintenance and the replacement are simple, and the technical requirement is low.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of the present invention;
FIG. 3 is a cross-sectional view of the present invention taken along line B-B.
Wherein: 1-a reactor body, 2-an anoxic zone, 3-an aerobic zone, 4-a settling zone, 5-a filter bed, 6-a siphon drain pipe, 7-a water inlet pipe, 8-a gas stripping return pipe, 9-an anoxic zone water inlet, 10-an anoxic zone water outlet, 11-a suspended filler, 12-a jet aeration pump, 13-an air release pipe, 14-an aerobic zone water outlet, 15-a siphon sleeve, 16-a liquid level valve, 17-a gas electromagnetic valve, 18-a water outlet pipe, 19-a sludge discharge pipe, 20-an anoxic denitrification tank and 21-a reactor body support frame.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the present invention without limiting the invention thereto.
Referring to fig. 1, the invention provides a low-energy consumption self-maintenance sewage treatment integrated device, which comprises a cylindrical reactor main body 1, wherein a filter bed 5 is arranged in the reactor main body 1, a water inlet pipe 7 and a siphon water outlet pipe 6 which extend into the lower part of the filter bed 5 are arranged along the side wall of the reactor main body 1, the water inlet pipe 7 is communicated with a gas stripping return pipe 8, the end part of the pipe orifice of the gas stripping return pipe 8 is communicated with an inverted cone-shaped tank body, the reactor main body 1 below the filter bed 5 is divided into a settling zone 4 and an aerobic zone 3 by the inverted cone-shaped tank body, and an aerobic zone water outlet; an anoxic denitrification tank 20 is arranged in the aerobic zone 3, the upper part of the anoxic denitrification tank 20 is communicated with the water inlet pipe 7, and the bottom of the anoxic denitrification tank 20 is provided with an anoxic zone water outlet 10.
The top of the gas stripping return pipe 8 is communicated with an air release pipe 13 extending out of the reactor main body 1; the siphon drain pipe 6 is sleeved with a siphon sleeve 15 outside the pipe extending into the filter bed 5, the siphon drain pipe 6 comprises a vertical pipe, a horizontal pipe and a U-shaped water storage pipe which are sequentially connected, wherein the vertical pipe penetrates through the filter bed 5 through the siphon sleeve 15 to be communicated with the sedimentation zone 4, the upper end of the U-shaped water storage pipe is provided with an emptying pipe, and the emptying pipe is provided with a gas electromagnetic valve 17. A liquid level valve 16 is installed in the siphon bell 15. The upper part of the reactor body 1 is provided with a water outlet pipe 18, the water outlet pipe 18 is arranged above the horizontal pipe of the siphon water outlet pipe 6, and the water inlet pipe 7, the siphon water outlet pipe 6 and the water outlet pipe 18 respectively extend out along different directions of the reactor body 1, as shown in figure 2. And the height of the transverse pipe of the air stripping return pipe 8 communicated with the water inlet pipe is not lower than that of the water outlet pipe 18.
As shown in FIG. 3 in conjunction with FIG. 1, a sludge discharge pipe 19 is provided at the bottom of the reactor main body 1. The anoxic denitrification tank 20 is fixed on the conical tank body at the bottom of the reactor main body through an anoxic zone support frame, and the reactor main body 1 is placed on the ground through a reactor main body support frame 21. The aerobic zone 3 is internally provided with a suspended filler 11 and a jet aeration pump 12, the water outlet of the jet aeration pump 12 is horizontally arranged along the inner cylinder wall of the aerobic zone, and the water outlet of the jet aeration pump 12 is arranged along the tangential direction of the inner cylinder wall of the aerobic zone.
The reactor main body 1 is respectively as follows from bottom to top (from inside to outside): an anoxic zone 2, an aerobic zone 3 and a settling zone 4.
The specific working process is as follows: sewage after simple deslagging pretreatment is converged by an inlet pipe 7 and nitrified liquid from an aerobic zone through an self-gas stripping return pipe 8, enters an anoxic zone 2 through an anoxic zone water inlet 9, and is subjected to anoxic denitrification to remove part of total nitrogen; the sedimentation zone 4 carries out mud-water separation on the effluent of the aerobic zone 3, the supernatant fluid flows through the filter bed 5 and is finally discharged, and the concentrated sludge falls back to the aerobic zone 3; the aerobic zone 3 removes pollutants such as COD, ammonia nitrogen and the like; the filter bed 5 further intercepts suspended substances in the effluent of the settling zone 4, and meanwhile, a filter material of the filter bed is attached with a biological membrane to further degrade pollutants; the siphon water discharge pipe 6 carries out siphon water discharge, can carry out back flush to the filter bed, guarantees the dry-wet alternate operation of the filter bed simultaneously, provides filter material biological membrane aerobic, anaerobism alternate environment, does benefit to the intensive denitrogenation.
Then, the wastewater flows into the aerobic zone 3 from a water outlet 10 of the anoxic zone, a suspended filler 11 and a jet aeration pump 12 are arranged in the aerobic zone 3, and the suspended filler 11 can be attached with a large number of microorganisms, so that the pollutant removal efficiency is improved; the jet aeration pump 12 can charge the air outside the system into the aerobic zone 3; meanwhile, the water outlet of the jet aeration pump 12 is in the tangential direction of the cylinder wall, so that the mixed liquid in the aerobic zone 3 has a stirring effect, the filler can be fully contacted with the sewage, the removal of pollutants is facilitated, and the water flow state in the aerobic zone 3 can be considered as a complete mixed type. In addition, due to the arrangement of the inverted cone structure above the aerobic zone 3, gas can be collected at the top end of the inverted cone and continuously rises through the gas stripping return pipe 8, part of nitrified liquid is brought out in the rising process, after the gas-water mixture reaches the top end, the gas is discharged from the air release pipe 13, and the nitrified liquid flows downwards automatically and is merged with the inflow raw water to enter the anoxic zone 2; the reflux quantity can be adjusted within a certain range through the pipe diameter of the gas stripping reflux pipe 8 and the height of the transverse pipe.
In addition, the residual muddy water mixed liquor in the aerobic zone 3 enters the sedimentation zone 4 through the aerobic zone water outlet 14, the cross section area of the sedimentation zone 4 is continuously increased from bottom to top due to the inverted cone-shaped tank body structure, so that the rising speed of the mixed liquor is reduced, the bottom of the inverted cone-shaped tank body is not sealed, the sludge is sunk and returns to the aerobic zone 3 again, and the supernatant rises and seeps out through the filter bed 5. The filter bed 5 is filled with a porous filter material, and supernatant in the settling zone 4 is further filtered to intercept suspended substances; meanwhile, the specific surface area of the porous filter material in the filter bed 5 is large, so a large number of microorganisms are attached to the porous filter material, and the filter bed has a further pollutant removing effect.
After a period of operation, the filter bed 5 may become clogged, resulting in a flux drop; at this time, the water level in the siphon sleeve 15 penetrating through the filter bed 5 rises, and when the water level rises to a set water level, the liquid level valve 16 touches the electromagnetic valve 17 connected with the liquid level valve through a wire to open temporarily and then close again, and the siphon drain pipe 6 performs siphon drainage until the bottom end of the vertical pipe of the siphon drain pipe 6 is exposed out of the water surface. In the drainage process, the water flow direction of the filter bed 5 is downward and is opposite to the normal operation flow direction, so that the back washing is completed, and the self maintenance of the reactor is realized.
The specific process of siphon drainage comprises the following steps: after once drainage, because the U-shaped water storage pipe at the bottom of the siphon drainage pipe 6 is filled with liquid, the air pressure in the siphon pipe is gradually increased along with the rising of the water level to form air resistance, even if the water level in the reactor exceeds the highest point of the siphon pipe and reaches the water level of the water outlet pipe 18, the water still can not be discharged from the siphon drainage pipe 6, only when the electromagnetic valve 17 is opened, the gas in the siphon pipe is discharged, the water in a settling zone can enter the siphon vertical pipe and cross the horizontal pipe to be discharged from a siphon drainage system by gravity, at the moment, the electromagnetic valve 17 is closed very quickly because the water level of the siphon sleeve pipe 15 descends, siphon drainage is formed, and the water level is leaked.
In this equipment, solenoid valve 17 is the gas solenoid valve, and consequently the pipe diameter is very little, and power is very low, and in addition, solenoid valve 17 and 16 non-continuous work of liquid level valve, consequently the power consumption is less, and these two normal operating requirements can be satisfied to small-size storage battery.
Although siphon drainage has a back-flushing effect, if the running time is too long, the filter bed 5 may be seriously jammed, and because the filter bed 5 is positioned at the upper end of the reactor, even if the filter bed is buried, the replacement and maintenance difficulty is not increased, and the filter bed is simply turned over or replaced manually by using tools such as a hoe, and the maintenance difficulty and the cost are lower.
In addition, in some remote rural areas, solar power generation can be used as power input for the jet aeration pump 12, so that the normal operation of the jet aeration pump 12 can be maintained even if power failure occurs at night. Moreover, the nitrification effect of the system is poor, and the drainage mode can be changed into siphon drainage through the adjustment of the height of the liquid level valve 16, so that the aerobic-anaerobic alternate operation of the filter bed is realized, and the nitrification effect of the filter bed is enhanced.
According to the integrated sewage treatment method provided by the embodiment of the invention, under the conditions that the concentrations of COD, ammonia nitrogen, total nitrogen and total phosphorus in inlet water are respectively not higher than 157.4mg/L, 20.1mg/L and 2.6mg/L, when the hydraulic retention time is controlled for 12 hours and the gas-water ratio is 6, the concentrations of COD, ammonia nitrogen, total nitrogen and total phosphorus in outlet water are respectively 13.8mg/L, 1.7mg/L, 6.2mg/L and 0.9 mg/L. The removal rates of COD, ammonia nitrogen, total nitrogen and total phosphorus are respectively 92%, 91.9%, 70.2% and 67.2%.
The system obtains better total nitrogen removal effect by using unpowered gas reflux under the condition of no nitrifying liquid reflux pump; under the condition of no sludge reflux pump, the biomass of the aerobic pool is maintained by utilizing the sludge self-reflux, and the clear effluent is ensured.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The self-maintenance sewage treatment integrated equipment is characterized by comprising a reactor main body (1), wherein a filter bed (5) is arranged in the reactor main body (1), a water inlet pipe (7) and a siphon water drain pipe (6) which extend into the lower part of the filter bed (5) are arranged along the side wall of the reactor main body (1), the water inlet pipe (7) is communicated with a gas stripping return pipe (8), the end part of the pipe orifice of the gas stripping return pipe (8) is communicated with an inverted cone tank body, the inverted cone tank body vertically divides the reactor main body (1) below the filter bed (5) into a settling zone (4) and an aerobic zone (3), the aerobic zone (3) is internally provided with an anoxic zone (2) separated by an anoxic denitrification tank (20), the upper part of the anoxic denitrification tank (20) is communicated with the water inlet pipe (7), and the bottom part of the anoxic; the bottom of the reactor main body (1) is provided with a sludge discharge pipe (19).
2. The self-maintenance sewage treatment integrated equipment according to claim 1, wherein the anoxic denitrification tank (20) is arranged at the bottom of the reactor body (1), and a water outlet (10) at the bottom of the anoxic zone is communicated with the aerobic zone (3); the bottom of the sedimentation zone (4) is communicated with the aerobic zone (3).
3. The self-maintenance sewage treatment integrated equipment according to claim 1, wherein a suspended filler (11) and a jet aeration pump (12) are arranged in the aerobic zone (3), and a water outlet of the jet aeration pump (12) is arranged along the tangential direction of the inner cylinder wall of the aerobic zone.
4. The integrated self-maintenance sewage treatment device according to claim 1, wherein the wall of the conical tank between the aerobic zone and the settling zone is provided with an aerobic zone water outlet (14).
5. A self-maintenance integrated sewage treatment plant according to claim 1, characterised in that an air release duct (13) is connected above the top of said stripping return duct (8).
6. The self-maintenance sewage treatment integrated equipment according to claim 1, wherein the siphon drain pipe (6) comprises a vertical pipe, a horizontal pipe and a U-shaped water storage pipe which are connected in sequence, wherein the vertical pipe passes through the filter bed (5) through a siphon sleeve (15) and is communicated with the settling zone (4), a gas solenoid valve (17) is arranged at the upper end of the U-shaped water storage pipe, a liquid level valve (16) is arranged in the siphon sleeve (15), and the liquid level valve (16) is connected with the solenoid valve (17) through a lead.
7. The self-maintenance sewage treatment integrated equipment according to claim 6, wherein a water outlet pipe (18) is arranged above the horizontal pipe of the siphon water outlet pipe (6).
8. A self-maintenance sewage treatment integrated device according to claim 7, characterized in that the height of the cross pipe of the air stripping return pipe (8) communicated with the water inlet pipe is not lower than the height of the water outlet pipe (18).
9. A self-maintenance integrated wastewater treatment method using the apparatus of any of claims 1-8, comprising:
the pretreated sewage enters an anoxic zone for anoxic denitrification after being converged by a water inlet pipe and a nitrifying liquid from the aerobic zone through a gas stripping return pipe;
carrying out mud-water separation on effluent from the aerobic zone in a precipitation zone, discharging supernatant after passing through a filter bed, and returning concentrated sludge to the aerobic zone;
the residual sludge-water mixed liquid in the aerobic zone enters a settling zone through a water outlet of the aerobic zone, the sludge returns to the aerobic zone again after sinking, and the supernatant rises and is exuded through a filter bed;
the water level of a siphon sleeve penetrating through the filter bed rises to a set water level, a siphon drain pipe conducts siphon drainage, and the water flow direction of the filter bed is downward to complete backwashing;
according to the water inflow and the concentration of COD, ammonia nitrogen, total nitrogen and total phosphorus of the inflow, the COD, ammonia nitrogen, total nitrogen and total phosphorus in the sewage are removed by adjusting the water-gas ratio, the gas stripping reflux and the sludge age.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110057369.6A CN112759201A (en) | 2021-01-15 | 2021-01-15 | Self-maintenance sewage treatment integrated equipment and sewage treatment method thereof |
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