CN114790035B - Integration MBR sewage treatment system - Google Patents
Integration MBR sewage treatment system Download PDFInfo
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- CN114790035B CN114790035B CN202210715203.3A CN202210715203A CN114790035B CN 114790035 B CN114790035 B CN 114790035B CN 202210715203 A CN202210715203 A CN 202210715203A CN 114790035 B CN114790035 B CN 114790035B
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
- C02F3/208—Membrane aeration
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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
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Abstract
The invention relates to an integrated MBR sewage treatment system, which comprises a biochemical treatment area and an equipment area, wherein the equipment area is positioned above the biochemical treatment area; the biochemical treatment area comprises an anoxic area, an anaerobic area and an aerobic area; the anoxic zone is positioned above the anaerobic zone and is connected with the anaerobic zone through a first connecting pipe; the aerobic zone is arranged on the side surface of the anaerobic zone and communicated with each other through the bottom opening; the aerobic zone is connected with the anoxic zone through the air-stripping sludge return pipe; the aerobic zone comprises a central MBR membrane component and an aerobic biochemical zone, and the aerobic biochemical zone is positioned around the MBR membrane component; the bottom of the aerobic biochemical area is provided with a plurality of aeration discs; the MBR membrane assembly comprises two groups of membrane elements, and the bottom of each group of membrane elements is provided with a membrane aeration device; the equipment area comprises an air blower and a suction pump, the air blower is respectively connected with the air stripping sludge return pipe, the aeration disc and the two membrane aeration devices through parallel pipelines, and the suction pump is connected with a water collecting main pipe of the MBR membrane component and is used for discharging produced water.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an integrated MBR sewage treatment system.
Background
Membrane Bioreactor (MBR) technology is a sewage treatment process that combines membrane separation technology with traditional biological treatment units. The process adopts membrane separation to replace a secondary sedimentation tank in the traditional activated sludge process for sludge-water separation, and has the advantages of small occupied area, excellent effluent quality, strong impact load resistance, high volume load and the like compared with the traditional activated sludge method.
However, the current MBR technology still has the following problems: (1) in the operation process of MBR, the phenomenon of membrane pollution can not be avoided, the membrane is usually required to be cleaned, and the current aeration cleaning needs larger aeration quantity, so that the energy consumption is higher and the operation cost is higher; (2) due to the high aeration amount, the MBR has high DO concentration in an aerobic zone, and cannot form anaerobic/anoxic and aerobic hydraulic circulation conditions necessary for nitrogen and phosphorus removal, so that the nitrogen and phosphorus removal efficiency is low. At present, the common MBR (membrane bioreactor) combined process for removing nitrogen and phosphorus adopts the traditional pump to return sludge to the anaerobic tank and the anoxic tank which are arranged in front to form hydraulic circulation so as to improve the effect of removing nitrogen and phosphorus, only replaces the traditional sedimentation tank with membrane separation, not only increases the floor area of a reactor, but also increases a reflux pump to further improve the energy consumption. The above problems seriously hinder the popularization and application of the MBR technology, and need to be solved urgently.
Disclosure of Invention
Aiming at the problems, the invention provides an integrated MBR sewage treatment system, which comprises a biochemical treatment area and an equipment area, wherein the equipment area is positioned above the biochemical treatment area;
the biochemical treatment area comprises an anoxic area, an anaerobic area and an aerobic area; the anoxic zone is positioned above the anaerobic zone and is connected with the anaerobic zone through a first connecting pipe; the aerobic zone is arranged on the side surface of the anaerobic zone and is communicated with each other through the bottom opening; the aerobic zone is connected with the anoxic zone through a gas stripping sludge return pipe and is used for returning the sludge in the aerobic zone to the anoxic zone;
the aerobic zone comprises an MBR membrane component and an aerobic biochemical zone, the MBR membrane component is arranged in the center of the aerobic zone, and the aerobic biochemical zone is arranged around the MBR membrane component; the bottom of the aerobic biochemical area is provided with a plurality of aeration discs; the MBR membrane assembly comprises two groups of membrane elements, and the bottom of each group of membrane elements is provided with a membrane aeration device;
the equipment area comprises an air blower and a suction pump, the air blower is respectively connected with an air stripping sludge return pipe, an aeration disc and two membrane aeration devices through parallel pipelines, and the suction pump is connected with a water collecting main pipe of an MBR membrane component and is used for discharging produced water.
Optionally, the effective volume ratio of the anoxic zone, the anaerobic zone and the aerobic zone is 1 (3-4) to (5-6), and the ratio of the membrane area of the MBR membrane module to the area projection area of the aerobic zone is 1 (5-10).
Optionally, a first water inlet is arranged at the upper part of the anoxic zone, and a grid is arranged below the first water inlet and used for filtering solid pollutants in sewage entering the anoxic zone; one side close to the first water inlet in the anoxic zone is the upstream side, and one side far away from the first water inlet is the downstream side.
Further optionally, a first water outlet is formed in the bottom of the downstream side of the anoxic zone, the first water outlet is connected with a first connecting pipe, the first connecting pipe is located at the top of the anaerobic zone and is parallel to the water flow direction of the anoxic zone, the water flow direction in the first connecting pipe is opposite to the water flow direction of the anoxic zone, an outlet of the first connecting pipe is a water inlet of the anaerobic zone, and sewage treated by the anoxic zone is input into the anaerobic zone;
the bottom of the anoxic zone is provided with a slope, the gradient of the slope is 5-10 degrees, the top of the slope is positioned at the upstream side of the anoxic zone, and the bottom of the slope is positioned at the downstream side of the anoxic zone.
According to the nitrogen and phosphorus values required by the sewage quality and the treated water quality, the anaerobic zone can be provided with or without a filler.
Optionally, one side of the anaerobic zone, which is close to the outlet of the first connecting pipe, is an upstream side, one side of the anaerobic zone, which is far away from the outlet of the first connecting pipe, is a downstream side, a partition wall is arranged on the downstream side of the anaerobic zone and used for separating the anaerobic zone from the aerobic zone, and the bottom of the partition wall is provided with the bottom opening and used for inputting sewage treated by the anaerobic zone into the aerobic zone.
Optionally, a gas stripping gas supply pipe and a gas stripping sludge return pipe are arranged on the side surface of the partition wall of the aerobic zone;
the inlet of the gas stripping sludge return pipe is positioned at the bottom of the aerobic zone, the gas stripping sludge return pipe is arranged upwards along the partition wall and sequentially penetrates through the aerobic zone, the anaerobic zone and the anoxic zone from the top of the aerobic zone, the outlet of the gas stripping sludge return pipe is positioned above the grating, and the sludge at the bottom of the aerobic biochemical zone is conveyed back to the anoxic zone.
Optionally, an air outlet of the blower is connected with an aeration main pipe, and a gas flow meter is arranged on the aeration main pipe; the aeration main pipe is connected with an air stripping air supply pipe, an aeration disc air supply main pipe and a membrane aeration air supply main pipe in parallel, the membrane aeration air supply main pipe is connected with a first membrane aeration branch pipe and a second membrane aeration branch pipe in parallel, and the aeration disc air supply main pipe is connected with the membrane aeration air supply main pipe through branch pipes;
the gas stripping gas supply pipe, the aeration disc gas supply main pipe, the first membrane aeration branch pipe and the second membrane aeration branch pipe are respectively communicated with the aerobic zone through the equipment zone, and are respectively connected with the inlet of the gas stripping sludge return pipe, a plurality of aeration discs of the aerobic biochemical zone and two membrane aeration devices to supply gas for each equipment.
The aeration disc air supply main pipe is connected with a plurality of aeration disc air supply branch pipes in parallel and supplies air for the aeration discs in different directions.
The suction pump can automatically run and periodically and intermittently run, the running time in 1 period is (4-13) min, and the stopping time is (1-2) min.
Optionally, the MBR membrane module is arranged at the middle upper part of the aerobic zone, and the top of the MBR membrane module is not higher than the liquid level of the aerobic zone;
the MBR membrane component is provided with a lifting device, the first membrane aeration branch pipe and the second membrane aeration branch pipe are connected with the two membrane aeration devices, and the hose with a certain length is reserved at the position, so that the MBR membrane component can move up and down conveniently.
Optionally, a separation barrel is arranged around the outer side of the MBR membrane module, the separation barrel is cylindrical, a top surface filter screen plate and a bottom surface filter screen plate which can be opened and closed are respectively arranged on the top surface and the bottom surface of the separation barrel, a plurality of through holes are uniformly and densely distributed on the side surface, cover plates which protrude outwards and are obliquely arranged are arranged on the side surfaces of the through holes, and the cover plates of all the through holes are arranged on the same side of the through holes.
Further optionally, the bottom surface filter screen plate is connected with a driving device of the equipment area through a telescopic loop bar, the telescopic loop bar penetrates through the inside of the separation barrel and the top surface filter screen plate, and the driving device can drive the separation barrel to rotate in place and move up and down.
The integrated MBR sewage treatment system has the following beneficial effects:
(1) the anoxic zone is arranged above the anaerobic zone, and the bottom of the anoxic zone is provided with a slope, so that sludge deposition in the anoxic zone is avoided, and an underwater stirring device in the anoxic zone is saved; the air stripping principle is adopted, so that the arrangement and energy consumption of a sludge reflux pump are saved;
(2) by controlling the aeration of each group of membrane elements and the aeration disc to be periodically stopped and matched with the suction pump, the total aeration quantity required by the membrane assembly is greatly reduced, the energy consumption is reduced by over 33 percent, meanwhile, the aeration of each group of membrane elements is enhanced, the aeration intensity is improved, the membrane pollution can be delayed, and the medicament cost is reduced;
(3) because the aeration is concentrated on the MBR membrane module, other areas of the sewage treatment system are easy to form anoxic and anaerobic environments, the nitrogen and phosphorus removal effect is improved, and the nitrogen and phosphorus of produced water stably reach the standard.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an integrated MBR sewage treatment system.
In the attached drawing, 1-an equipment area, 2-an anoxic area, 3-an anaerobic area, 4-an aerobic area, 5-a first connecting pipe, 6-a bottom opening, 7-a gas-stripping sludge return pipe, 8-an MBR membrane component, 9-an aerobic biochemical area, 10-an aeration disc, 11-a membrane element, 12-a membrane aeration device, 13-a blower, 14-a suction pump, 15-a water collecting main pipe, 16-a grid, 17-a partition wall, 18-an aeration main pipe, 19-a gas-stripping gas supply pipe, 20-an aeration disc gas supply main pipe, 21-a membrane aeration gas supply main pipe, 22-a first membrane aeration branch pipe, 23-a second membrane aeration branch pipe, 24-a branch pipe, 25-a first manual regulating valve, 26-a second manual regulating valve and 27-a third manual regulating valve, 28-a fourth manual regulating valve, 29-a fifth manual regulating valve, 30-an electromagnetic three-way valve, 31-a first electromagnetic valve, 32-a second electromagnetic valve, 33-a second connecting pipe, 34-a water inlet three-way valve, 35-a medicament pipe, 36-a water production pipe, 37-a cleaning valve, 38-an on-site pressure gauge, 39-a pressure transmitter and 40-a flow meter.
Detailed Description
The raw water treated in the following examples and comparative examples was domestic sewage of a certain market at a treatment scale of 10m 3 The raw water sequentially passes through the coarse grating, the fine grating and the regulating tank and waits for further treatment, and the quality of the sewage after passing through the regulating tank is as follows:
TABLE 1 quality of wastewater influent
Example 1
The embodiment provides an integrated MBR sewage treatment system, which comprises a biochemical treatment area and an equipment area 1, wherein the equipment area 1 is positioned above the biochemical treatment area;
the biochemical treatment area comprises an anoxic area 2, an anaerobic area 3 and an aerobic area 4; the anoxic zone 2 is positioned above the anaerobic zone 3 and is connected with each other through a first connecting pipe 5; the aerobic zone 4 is arranged on the side surface of the anaerobic zone 3 and is communicated with each other through a bottom opening 6; the aerobic zone 4 is connected with the anoxic zone 2 through a gas stripping sludge return pipe 7 and is used for returning the sludge in the aerobic zone 4 to the anoxic zone 2;
the aerobic zone 4 comprises an MBR membrane module 8 and an aerobic biochemical zone 9, the MBR membrane module 8 is arranged in the center of the aerobic zone 4, and the aerobic biochemical zone 9 is arranged around the MBR membrane module 8; the bottom of the aerobic biochemical zone 9 is provided with a plurality of aeration discs 10; the MBR membrane module 8 comprises two groups of membrane elements 11, and the bottom of each group of membrane elements 11 is provided with a membrane aeration device 12;
the equipment area 1 comprises an air blower 13 and a suction pump 14, the air blower 13 is respectively connected with an air stripping sludge return pipe 7, an aeration disc 10 and two membrane aeration devices 12 through parallel pipelines, and the suction pump 14 is connected with a water collecting main pipe 15 of an MBR membrane module 8 and is used for discharging produced water.
The total effective volume of the biochemical treatment area is 66m 3 The effective volume ratio of the anoxic zone 2, the anaerobic zone 3 and the aerobic zone 4 is 1:3:5, and the ratio of the membrane area of the MBR membrane component to the area projection area of the aerobic zone is 1: 10.
A first water inlet is formed in the upper part of the anoxic zone 2 and is connected with a water inlet pump through a pipeline, and a grid 16 is arranged below the first water inlet and is used for filtering solid pollutants in sewage entering the anoxic zone 2; one side of the anoxic zone 2 close to the first water inlet is an upstream side, and one side far away from the first water inlet is a downstream side.
A first water outlet is formed in the bottom of the downstream side of the anoxic zone 2 and is connected with a first connecting pipe 5, the first connecting pipe 5 is positioned at the top of the anaerobic zone 3 and is parallel to the water flow direction of the anoxic zone 2, the water flow direction in the first connecting pipe 5 is opposite to the water flow direction of the anoxic zone 2, the outlet of the first connecting pipe 5 is a water inlet of the anaerobic zone 3, and sewage treated by the anoxic zone 2 is input into the anaerobic zone 3;
the bottom in anoxic zone 2 is equipped with the slope, the slope on slope is 5-10, the top of slope is in anoxic zone 2's upstream side, and the bottom of slope is in anoxic zone 2's downstream side, and the bottom of slope is close to first delivery port promptly, is convenient for lead to first delivery port with anoxic zone 2's water and mud.
One side of the anaerobic zone 3 close to the outlet of the first connecting pipe 5 is an upstream side, one side of the anaerobic zone far away from the outlet of the first connecting pipe 5 is a downstream side, a partition wall 17 is arranged on the downstream side of the anaerobic zone 3 and used for separating the anaerobic zone 3 from the aerobic zone 4, and the bottom of the partition wall 17 is provided with the bottom opening 6, namely the bottom opening 6 is positioned on the downstream side of the anaerobic zone 3 and used for inputting sewage treated by the anaerobic zone 3 into the aerobic zone 4. The anaerobic zone 3 is not provided with a filler.
A gas stripping gas supply pipe 19 and a gas stripping sludge return pipe 7 are arranged on the side surface of the partition wall 17 of the aerobic zone 4;
the inlet of the gas stripping sludge return pipe 7 is positioned at the bottom of the aerobic zone 4, the gas stripping sludge return pipe 7 is arranged upwards along the partition wall 17 and sequentially penetrates through the aerobic zone 4, the anaerobic zone 3 and the anoxic zone 2 from the top of the aerobic zone 4, the outlet of the gas stripping sludge return pipe 7 is positioned above the grating 16, the sludge at the bottom of the aerobic biochemical zone 9 is conveyed back to the anoxic zone 2, is primarily filtered by the grating 16 and fully mixed with sewage, then enters the anoxic zone 2, and sequentially flows through the anaerobic zone 3 and the aerobic zone 4, and is subjected to circulation of anoxic, anaerobic, aerobic and anoxic in the process, so that anoxic-anaerobic-aerobic-anoxic-aerobic hydraulic circulation conditions are created for efficient nitrogen and phosphorus removal. The stripping sludge reflux mode is adopted to replace the traditional sludge reflux pump mode, thereby not only reducing the investment of the sludge pump, but also reducing the energy consumption.
The air outlet of the blower 13 is connected with the aeration main pipe 18, and a gas flow meter 40 is arranged on the aeration main pipe 18; the aeration main pipe 18 is connected with an air-stripping air supply pipe 19, an aeration disc air supply main pipe 20 and a membrane aeration air supply main pipe 21 in parallel, the membrane aeration air supply main pipe 21 is connected with a first membrane aeration branch pipe 22 and a second membrane aeration branch pipe 23 in parallel, and the aeration disc air supply main pipe 20 is connected with the membrane aeration air supply main pipe 21 through a branch pipe 24;
the air-stripping air supply pipe 19, the aeration disc air supply main pipe 20, the first membrane aeration branch pipe 22 and the second membrane aeration branch pipe 23 are all introduced into the aerobic zone 4 from the equipment zone 1, and are respectively connected with the inlet of the air-stripping sludge return pipe 7, a plurality of aeration discs 10 of the aerobic biochemical zone 9 and two membrane aeration devices 12 to supply air for each equipment.
The blower 13 is provided with a frequency converter, and the blowing amount can be adjusted through frequency modulation, so that the aeration amount can be adjusted.
The upper part of the gas-stripping gas supply pipe 19 is provided with a first manual regulating valve 25 for manually controlling the gas supply of the gas-stripping gas supply pipe 19 so as to control the sludge in the aerobic zone 4 to flow back to the anoxic zone 2;
the upper part of the aeration disc air supply main pipe 20 is provided with a second manual regulating valve 26 which is used for manually controlling the air supply of the aeration disc 10 and providing enough oxygen for the aerobic biochemical area 9;
the aeration disc air supply main pipe 20 is connected with the branch pipe 24 through an electromagnetic three-way valve 30, so that air is supplied from the aeration disc air supply main pipe 20 to the membrane aeration air supply main pipe 21;
the upper part of the membrane aeration air supply main pipe 21 is provided with a third manual regulating valve 27 for manually controlling the air supply of the membrane aeration device 12; the upper parts of the first membrane aeration branch pipe 22 and the second membrane aeration branch pipe 23 are respectively provided with a first electromagnetic valve 31 and a second electromagnetic valve 32, so that the two membrane aeration devices 12 can supply air respectively.
The aerobic biochemical region 9 is annularly distributed around the MBR membrane module 8, a plurality of aeration discs 10 are uniformly distributed at the bottom of the aerobic biochemical region 9, sewage is treated by the aerobic biochemical region 9 and then enters the MBR membrane module 8 inwards, and after membrane treatment, produced water is discharged by a water collecting main pipe 15 and a suction pump 14;
the aeration disc air supply main pipe 20 is connected with four aeration discs 10 in parallel to supply air for the aeration discs 10 in different directions.
An outlet of a water collecting main pipe 15 of the MBR membrane module 8 is connected with an inlet of a second connecting pipe 33, an outlet of the second connecting pipe 33 is connected with a first inlet of a water inlet tee 34, a second inlet of the water inlet tee 34 is connected with a medicament pipe 35, an outlet of the water inlet tee 34 is connected with an inlet of a suction pump 14, an outlet of the suction pump 14 is connected with a water production pipe 36, water produced by the MBR membrane module 8 is pumped out by the suction pump 14, a medicament required by membrane cleaning is connected with the second connecting pipe 33 through a backwashing pump by the medicament pipe 35, a cleaning medicament is introduced into and cleans the MBR membrane module 8, and a medicament tank is connected to the upstream side of the medicament pipe 35.
The drug tube 35 is provided with a purge valve 37 and an in situ pressure gauge 38 for controlling the delivery of the drug.
And a pressure transmitter 39 and a fourth manual regulating valve 28 door are arranged on a pipeline between the outlet of the water inlet tee 34 and the inlet of the suction pump 14 and are used for manually controlling the output of produced water.
And a fifth manual regulating valve 29 and a flowmeter 40 are arranged on the water production pipe 36, the flowmeter 40 is a rotor flowmeter and an electromagnetic flowmeter and is used for controlling the output and the flow of the produced water, and the water production pipe 36 is connected with a clean water tank.
In the embodiment, the MBR membrane module 8 is divided into two identical membrane elements 11, the bottom of each membrane element 11 is provided with one membrane aeration device 12, and the two membrane aeration devices 12 are respectively connected with the first membrane aeration branch pipe 22 and the second membrane aeration branch pipe 23, so that the aeration and aeration amount can be respectively controlled, and the membrane module can be conveniently cleaned while the aeration energy consumption is controlled. Specifically, the suction pump 14 can be operated automatically and periodically and intermittently, the operation time in 1 period is 13min, and the stop time is 2 min. When the suction pump 14 is in the running state, the second manual regulating valve 26, the third manual regulating valve 27, the first electromagnetic valve 31 and the second electromagnetic valve 32 are all opened, the electromagnetic three-way valve 30 is switched to the aeration plate air supply main pipe 20 for aeration, and the two membrane aeration devices 12 and the aeration plate 10 of the aerobic biochemical area 9 are all aerated.
When the suction pump 14 stops operating, the electromagnetic three-way valve 30 is switched to the branch pipe 24 for aeration, namely the aeration disc air supply main pipe 20 supplies air to the membrane aeration air supply main pipe 21, so that the aeration quantity of the two membrane aeration devices 12 is increased; meanwhile, the first electromagnetic valve 31 and the second electromagnetic valve 32 are sequentially opened and closed, so that the aeration time of each membrane aeration device 12 is half of the stop time of the suction pump 14, namely during the stop of the suction pump 14, the aeration amount of the aeration disc 10 is supplied to the membrane aeration devices 12, the total air supply amount of the membrane aeration devices 12 is increased, meanwhile, only one membrane aeration device 12 is used for aeration, the aeration amount is increased to more than 2 times of the original aeration amount, the aeration amount and the strength of each membrane aeration device 12 are further increased, the aeration time of each group of membrane elements 11 is half of the stop time of the suction pump 14, the aeration amount is the sum of the aeration amounts of the two groups of membrane elements 11 and the aeration disc 10, the aeration amount of the membrane assemblies is greatly increased, the membrane surface washing is facilitated, and the membrane pollution is greatly delayed.
Assume that the total aeration rate of the blower 13 is N m 3 H, the cleaning aeration quantity of the membrane module is n m 3 H, the aeration quantity of the aerobic biochemical zone 9 is (N-N) m 3 H total membrane module area A m 2 The aeration intensity of the membrane component designed by the traditional continuous aeration mode is (n/A) m 3 /m 2 H. In the present invention, the maximum aeration intensity of each membrane element 11 is 2 (N/A) m 3 /m 2 H. When N =3:2, the maximum aeration intensity of each set of membrane elements 11 of the present invention is 3(N/a) m 3 /m 2 H, 3 times of the traditional continuous aeration mode.
When the suction pump 14 periodically operates, the DO of the aerobic biochemical zone 9 is 2-6mg/L, the DO of the anoxic zone 2 is 1-1.5mg/L, the DO at the upstream side of the anaerobic zone 3 is 0.5-1mg/L, and the DO at the downstream side of the anaerobic zone 3 is 0-0.3 mg/L. When the suction pump 14 is periodically stopped, as the MBR membrane module 8 is positioned at the center of the aerobic zone 4 and only the MBR membrane module 8 is aerated, the DO in the area of the MBR membrane module 8 can reach 6-8mg/L, and meanwhile, the aeration disc 10 of the aerobic biochemical zone 9 stops aeration, the DO is rapidly reduced to 0mg/L, as the oxygen content of the return sludge is also reduced, the DO in the anoxic zone 2 is reduced to 0.5-1mg/L, the DO at the upstream side of the anaerobic zone 3 is reduced to 0.3-0.5mg/L, the DO at the downstream side of the anaerobic zone 3 is basically reduced to 0mg/L, and the dissolved oxygen content is reduced, thereby greatly improving the actual effects of anoxia and anaerobism and being beneficial to improving the denitrification and dephosphorization effects.
Specifically, in the present embodiment, the total aeration amount of the blower 13 is 100m 3 H, the aeration quantity is 50m when the aerobic biochemical zone 9 is aerated 3 The gas-stripping gas supply pipe 19 aerates only when the sludge backflow is needed, when the suction pump is periodically stopped, the aerobic biochemical area 9 and the gas supply pipe 19 are not aerated, all aeration quantities are concentrated into a group of membrane elements, and the aeration quantity of the membrane elements for cleaning is 100m 3 H, total area of MBR membrane module 8 is 2m 2 The area of one set of membrane elements 11 is 1m 2 In this embodiment, the maximum aeration intensity of the membrane element set 11 is (100/1) =100m 3 /m 2 ·h。
The operating power is configured as follows: the power of the blower is 2.2kW, the water inlet pump and the suction pump are both 1.1kW, the total running maximum power is 4.4 kW, and the power is reduced by 40% compared with the power in the comparative example 1.
Although the total aeration amount of this example was reduced by about 33% as compared with comparative example 1, the membrane fouling rate of this example was 0.7 kPa/day, and was reduced by 0.16 kPa/day as compared with 0.86 kPa/day of comparative example 1, and the membrane fouling rate of progress was slowed down.
Comparative example 1
The integrated MBR sewage treatment system of this comparative example is the same as embodiment 1, and the difference lies in that MBR membrane module 8 does not divide into two sets of membrane elements, and MBR membrane module 8 bottom sets up a membrane aeration equipment, and membrane aeration air supply main 21 does not divide into first membrane aeration and divides the pipe with the second membrane aeration, but membrane aeration air supply main directly aerates for membrane aeration equipment, clearance MBR membrane module 8. The gas stripping gas supply pipe 19 is not arranged, and a sludge return pump is arranged on the gas stripping sludge return pipe 7.
In this comparative example, the total aeration amount of the blower 13 was 150 m 3 H, the cleaning aeration quantity of the membrane module is 100m 3 H, continuously aerating the aerobic biochemical zone 9 with aeration rate of 50m 3 H, total area of MBR membrane module 8 is 2m 2 The aeration intensity of the membrane module in the continuous aeration mode is (100/2) =50 m 3 /m 2 ·h。
The operating power is configured as follows: the power of the blower is 3kW, the water inlet pump and the suction pump are both 1.1kW, the sludge reflux pump is 2.2kW, and the total maximum power operation is 7.4 kW. The membrane pollution development degree is inversely proportional to the rising rate of transmembrane pressure difference (unit kPa), the membrane pollution development degree is measured by adopting the daily transmembrane pressure difference rising rate, and the higher the value is, the higher the membrane pollution development speed is. After the sewage treatment system operates stably, the rising rate of membrane pollution is 0.86 kPa/day.
Table 2 comparison of water production effects of example 1 and comparative example 1
According to the integrated MBR sewage treatment system, the original aerobic area is divided into an MBR membrane component and an aerobic biochemical area, an air-stripping air supply pipe and an air-stripping sludge return pipe are additionally arranged to replace a sludge return pump to carry out sludge return, the tail end of the air-stripping sludge return pipe is extended to the anoxic area, the membrane component and the aeration system are modified, the membrane component is modified into two independent groups of membrane elements and two corresponding membrane aeration devices, and an aeration disc air supply main pipe is connected with a membrane aeration air supply main pipe through a branch pipe, so that the power consumption of the equipment is reduced, the membrane pollution condition is improved under the condition that the total aeration quantity is reduced, all indexes of produced water are reduced, and the quality of produced water is better.
Example 2
The integrated MBR sewage treatment system of the present embodiment is the same as that of embodiment 1, except that the MBR membrane module 8 is disposed at the middle upper part of the aerobic zone 4, and the top of the MBR membrane module 8 is not higher than the liquid level of the aerobic zone 4, that is, the MBR membrane module 8 is always submerged below the liquid level of the aerobic zone 4 during sewage treatment;
the MBR membrane module 8 is provided with a lifting device, so that the height of the MBR membrane module 8 can be conveniently adjusted along with the liquid level change of the aerobic zone 4, and the first membrane aeration branch pipe 22 and the second membrane aeration branch pipe 23 are connected with the two membrane aeration devices 12, so that hoses with certain lengths are reserved, and the MBR membrane module 8 can conveniently move up and down.
Example 3
The integration MBR sewage treatment system of this embodiment is the same with embodiment 2, and the difference lies in, be equipped with around the outside of MBR membrane module 8 and separate the bucket, it is cylindrical to separate the bucket, and its top surface and bottom surface are equipped with the top surface that can open and shut respectively and filter the otter board with the bottom surface, and a plurality of through-holes are evenly densely covered to the side, and the side of through-hole is equipped with the apron that outside convex slope set up, and the apron of all through-holes all establishes in the same one side of through-hole, and the apron of all through-holes all establishes in the left side of through-hole.
The bottom surface filter screen plate is connected with a driving device of the equipment area 1 through a telescopic loop bar, the telescopic loop bar penetrates through the inside of the separation barrel and the top surface filter screen plate, and the driving device can drive the separation barrel to rotate in place and move up and down.
The telescopic loop bar is simultaneously connected with the MBR membrane module 8 to drive the MBR membrane module 8 and the separation barrel to move up and down and rotate in situ; the inner rod at the lower part of the telescopic loop bar is connected with the separation barrel, the loop bar at the upper part of the telescopic loop bar is connected with the MBR membrane assembly 8, only the inner rod rotates, the loop bar does not rotate, and the MBR membrane assembly 8 can not rotate and the separation barrel rotates.
Two ends of the top surface filter screen plate are rotatably connected with the top of the side surface of the separation barrel, and the middle part of the top surface filter screen plate can be opened and closed; the two ends of the bottom surface filter screen plate are rotatably connected with the bottom of the side surface of the separation barrel, and the middle part of the bottom surface filter screen plate can be opened and closed.
The MBR membrane component 8 and the aerobic biochemical zone 9 are positioned in the aerobic zone 4, sludge in the aerobic biochemical zone 9 can generate adverse effect on the MBR membrane component 8, the pollution condition of the MBR membrane component 8 is aggravated, and sewage in the aerobic biochemical zone 9 automatically and irregularly flows to the MBR membrane component 8 for treatment, so that the sewage treatment efficiency is not ideal. Therefore, the MBR membrane module 8 is arranged at the middle upper part of the aerobic zone 4, so that the influence of the sludge in the aerobic biochemical zone 9 on the MBR membrane module 8 is reduced, and the influence of the sludge can be further reduced by matching with the separation barrel. When a large amount of water is required to enter the MBR membrane module 8 from the aerobic biochemical region 9, the separating barrel rotates, the water pressure inside the separating barrel is lower than that outside the separating barrel, and the outside sewage enters the MBR membrane module 8 for treatment after being filtered by the bottom and the side surface of the separating barrel. The water body entering from the through hole on the side surface of the separation barrel has a fast flow velocity, the disturbance degree of water entering the MBR membrane assembly 8 area can be increased, the sludge polluted by the membrane is promoted to drop, and the membrane material can be directly washed from the water body entering from the through hole, so that the membrane pollution condition is improved. The cover plate at the through hole on the side surface also plays a role in intercepting sludge in the water inflow, so that the water inflow for washing is cleaner.
When one membrane aeration device 12 of the MBR membrane module 8 is used for aeration, the aeration intensity of the area of the MBR membrane module 8 is increased, the aerobic biochemical region is not aerated, the dissolved oxygen is reduced, the separation effect of the separation barrel can further improve the aeration cleaning effect of the MBR membrane module 8, meanwhile, the water disturbance of the aerobic biochemical region is further weakened, and the dissolved oxygen is further reduced. In addition, when one membrane aeration device 12 of the MBR membrane component 8 is used for aeration, the sewage falling after the membrane material is cleaned moves upwards under the action of aeration and is intercepted by the top surface filter screen plate, when the aerobic biochemical area is used for aeration again, the top surface filter screen plate is opened from the middle part and rotates 180 degrees, the two sub-plates of the top surface filter screen plate are positioned at the upper part of the aerobic biochemical area, the side for intercepting the sewage faces upwards, and under the action of the upward aeration of the aerobic biochemical area, the top surface filter screen plate can be cleaned, so that the sewage on the top surface filter screen plate falls in the aerobic biochemical area, and the sludge of the MBR membrane component 8 is recovered.
When water enters the MBR membrane module 8, the separating barrel rotates to filter the intercepted sludge on the side surface, and the intercepted sludge can be thrown off through the reverse rotation of the separating barrel; the sludge filtered and intercepted by the bottom surface filter screen plate can be opened by the bottom surface filter screen plate and cleaned under the aeration action of the aerobic biochemical zone. So far, the sludge intercepted on the surface of the separation barrel can be cleaned by utilizing the self aeration effect of the MBR membrane module 8 and the aerobic biochemical region and the self rotation of the separation barrel, and the cleaned sludge returns to the aerobic biochemical region, so that the sludge burden can not be brought to the MBR membrane module 8.
TABLE 3 comparison of the fouling of the membranes of examples 1-3
As can be seen from the above table, the improvement of the horizontal height of the MBR membrane module of the present invention is beneficial to the improvement of the membrane pollution, and the matching of the partition barrel can further prolong the membrane operation period, prevent a large amount of sludge in the aerobic biochemical region from entering the MBR membrane module area, and further reduce the dissolved oxygen amount in the aerobic biochemical region when the MBR membrane module is aerated and cleaned, in example 3, NH in the produced water quality 3 N, TN and TP are respectively 0.2, 7 and 0.3, further improving the denitrification and dephosphorization effect.
Claims (7)
1. An integrated MBR sewage treatment system is characterized by comprising a biochemical treatment area and an equipment area, wherein the equipment area is positioned above the biochemical treatment area;
the biochemical treatment area comprises an anoxic area, an anaerobic area and an aerobic area; the anoxic zone is positioned above the anaerobic zone and is connected with the anaerobic zone through a first connecting pipe; the aerobic zone is arranged on the side surface of the anaerobic zone and communicated with each other through the bottom opening; the aerobic zone is connected with the anoxic zone through a gas stripping sludge return pipe and is used for returning the sludge in the aerobic zone to the anoxic zone;
the aerobic zone comprises an MBR membrane component and an aerobic biochemical zone, the MBR membrane component is arranged in the center of the aerobic zone, and the aerobic biochemical zone is arranged around the MBR membrane component; the bottom of the aerobic biochemical area is provided with a plurality of aeration discs; the MBR membrane assembly comprises two groups of membrane elements, and the bottom of each group of membrane elements is provided with a membrane aeration device;
the equipment area comprises an air blower and a suction pump, the air blower is respectively connected with an air stripping sludge return pipe, an aeration disc and two membrane aeration devices through parallel pipelines, and the suction pump is connected with a water collecting main pipe of an MBR membrane component and is used for discharging produced water;
the top of the MBR membrane module is not higher than the liquid level of the aerobic zone; the MBR membrane component is provided with a telescopic loop bar, so that the MBR membrane component can move up and down;
a separating barrel is arranged around the outer side of the MBR membrane component, the separating barrel is cylindrical, a top surface filter screen plate and a bottom surface filter screen plate which can be opened and closed are respectively arranged on the top surface and the bottom surface of the separating barrel, a plurality of through holes are uniformly and densely distributed on the side surface, cover plates which are obliquely arranged and protrude outwards are arranged on the side surfaces of the through holes, and the cover plates of all the through holes are arranged on the same side of the through holes;
the bottom surface filter screen plate is connected with a driving device of the equipment area through a telescopic loop bar, the telescopic loop bar penetrates through the inside of the separation barrel and the top surface filter screen plate, the driving device can drive the separation barrel to rotate in place and move up and down, the MBR membrane assembly is prevented from rotating, and the separation barrel rotates.
2. The integrated MBR sewage treatment system of claim 1, wherein the effective volume ratio of the anoxic zone, the anaerobic zone and the aerobic zone is 1 (3-4) to (5-6).
3. The integrated MBR sewage treatment system of claim 2, wherein a first water inlet is arranged at the upper part of the anoxic zone, and a grid is arranged below the first water inlet;
one side close to the first water inlet in the anoxic zone is the upstream side, and one side far away from the first water inlet is the downstream side.
4. The integrated MBR sewage treatment system according to claim 3, wherein a first water outlet is arranged at the bottom of the downstream side of the anoxic zone, the first water outlet is connected with a first connecting pipe, the first connecting pipe is arranged at the top of the anaerobic zone and is parallel to the water flow direction of the anoxic zone, the water flow direction in the first connecting pipe is opposite to the water flow direction of the anoxic zone, the outlet of the first connecting pipe is the water inlet of the anaerobic zone, and sewage treated by the anoxic zone is input into the anaerobic zone;
the bottom of the anoxic zone is provided with a slope, the gradient of the slope is 5-10 degrees, the top of the slope is positioned at the upstream side of the anoxic zone, and the bottom of the slope is positioned at the downstream side of the anoxic zone.
5. The integrated MBR sewage treatment system of claim 4, wherein the side of the anaerobic zone proximal to the outlet of the first connecting pipe is an upstream side and the side distal to the outlet of the first connecting pipe is a downstream side; the downstream side of the anaerobic zone is provided with a partition wall for separating the anaerobic zone from the aerobic zone, and the bottom of the partition wall is provided with the bottom opening for inputting the sewage treated by the anaerobic zone into the aerobic zone.
6. The integrated MBR sewage treatment system of claim 5, wherein a gas stripping air supply pipe and a gas stripping sludge return pipe are arranged on the side surface of the partition wall of the aerobic zone;
the inlet of the gas stripping sludge return pipe is positioned at the bottom of the aerobic zone, the gas stripping sludge return pipe is arranged upwards along the partition wall and sequentially penetrates through the aerobic zone, the anaerobic zone and the anoxic zone from the top of the aerobic zone, the outlet of the gas stripping sludge return pipe is positioned above the grating, and the sludge at the bottom of the aerobic biochemical zone is conveyed back to the anoxic zone.
7. The integrated MBR sewage treatment system of claim 6, wherein the air outlet of the blower is connected with an aeration main pipe, and the air-stripping air supply pipe, the aeration disc air supply main pipe and the membrane aeration air supply main pipe are connected in parallel and then connected with the aeration main pipe; the first membrane aeration branch pipe and the second membrane aeration branch pipe are connected in parallel and then connected with a membrane aeration air supply main pipe; the aeration disc air supply main pipe is connected with the membrane aeration air supply main pipe through a branch pipe;
the gas stripping gas supply pipe, the aeration disc gas supply main pipe, the first membrane aeration branch pipe and the second membrane aeration branch pipe are all introduced into the aerobic zone from equipment areas, and are respectively connected with an inlet of a gas stripping sludge return pipe, a plurality of aeration discs of the aerobic biochemical zone and two membrane aeration devices to supply gas for each equipment;
the first membrane aeration branch pipe and the second membrane aeration branch pipe are connected with the position of the two membrane aeration devices through flexible pipes.
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