CN111333205A - Aeration method and device for biological sewage treatment - Google Patents

Aeration method and device for biological sewage treatment Download PDF

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Publication number
CN111333205A
CN111333205A CN202010245934.7A CN202010245934A CN111333205A CN 111333205 A CN111333205 A CN 111333205A CN 202010245934 A CN202010245934 A CN 202010245934A CN 111333205 A CN111333205 A CN 111333205A
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aeration
hollow fiber
fiber membrane
aerator
hole
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张书廷
曾锐
王宇乾
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Tianjin University
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Tianjin University
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00Aeration of stretches of water
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention discloses an aeration method and a device for biological sewage treatment, wherein aeration is alternately carried out or simultaneously carried out by two modes of hollow fiber membrane aeration and aeration through aeration holes, or alternatively carried out or simultaneously carried out by two modes of hollow fiber membrane aeration and jet aeration at the bottom of a biological treatment tank; the device for realizing the aeration method of the biological sewage treatment comprises a biological treatment tank, a blower, a hollow fiber membrane aerator, an aeration hole aerator and an aeration regulation controller; the hollow fiber membrane aerator and the aeration hole aerator are arranged in the biological treatment tank, and gas inlets of the hollow fiber membrane aerator and the aeration hole aerator are connected with the side of the blower; the inlet pipeline of the aeration hole aerator is provided with a valve, and the opening and the openness of the valve are controlled by an aeration adjusting controller. The invention not only improves the utilization rate of oxygen and reduces the air consumption of aeration, but also realizes good mixing of sewage and microorganisms, achieves good sewage treatment and reduces the operation cost and equipment investment.

Description

Aeration method and device for biological sewage treatment
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an aeration method and device for biological sewage treatment.
Background
The hollow fiber membrane is a hollow cavity fiber filament processed by polysulfone, dimethylacetamide and the like as raw materials, and has the selective permeability and the self-supporting function. The hollow fiber membrane aeration is superior to other processes in many aspects, such as no noise in operation, simple operation and high oxygen utilization rate. The hollow fiber membrane can realize high efficiency oxygen supply because it can realize bubble-free aeration. Bubble-free aeration, also called bubble-free oxygen supply, is an air supply mode in which external air or pure oxygen is continuously introduced into a tube cavity of a hollow fiber membrane, water flows outside the tube, the air pressure is kept lower than a bubble point (namely the lowest pressure when bubbles visible to the naked eye are generated in the aeration process), and oxygen partial pressure on two sides of the membrane pushes oxygen in the tube cavity to directly diffuse into water outside the tube through a membrane wall or micropores on the membrane wall. Oxygen is highly dispersed in the film, and thus the oxygen utilization rate is high.
And the sewage treatment plant adopting the traditional aeration hole aeration method and the like has great cost for aeration. This is because the conventional aeration hole aeration method has a low oxygen utilization rate. However, the conventional aeration method has the function of stirring the water in the biological treatment tank in addition to the function of providing oxygen, so that microorganisms and sewage can be well mixed and contacted. How to reduce the aeration cost on the premise of ensuring sufficient oxygen supply and sufficient stirring in the biological treatment tank is a technical problem which is hoped to be solved by scientific researchers. The invention carries out deep research on the requirements and the differences between oxygen supply and stirring, expects to utilize the stirring advantages of the traditional aeration holes and reduce the using amount of air, thereby achieving the purposes of stirring and oxygenation by more efficient coupling of aeration and stirring and providing a new method for sewage treatment.
Disclosure of Invention
The invention aims to provide an aeration method and an aeration device which are low in cost, high in efficiency and capable of supplying oxygen and have a stirring function. Through the combination of hollow fiber membrane aeration, aeration hole aeration and the like, the low-cost and high-efficiency oxygen supply is realized, and the stirring effect on the water body in the biological treatment tank is realized.
The technology of the invention is realized by adopting the following scheme:
an aeration method for biological sewage treatment, which supplies oxygen to a biological treatment tank by the following steps:
the aeration through the hollow fiber membrane and the aeration through the aeration holes are alternatively carried out or simultaneously carried out,
or alternatively or simultaneously carrying out hollow fiber membrane aeration and jet aeration at the bottom of the biological treatment tank,
or a combination of the above.
Further, in the method, in the case where the two aeration modes are alternately performed, the aeration time by the hollow fiber membrane is longer than the operation time of the other methods.
Further, in the method, in the case where the two aeration methods of the hollow fiber membrane aeration and the aeration hole aeration are simultaneously performed, the amount of air to be aerated through the aeration hole is 1/3 or less of the amount of air to be used for the simple aeration hole aeration, and in the case where the two aeration methods of the hollow fiber membrane aeration and the jet aeration are simultaneously performed, the amount of air to be aerated through the jet is 1/3 or less of the amount of air to be used for the simple jet aeration.
In the method, when the hollow fiber membrane aeration and the aeration hole aeration or the jet flow aeration are alternately performed, the aeration hole aeration or the jet flow aeration are alternately performed at different positions of the biological treatment tank.
Further, in the method, in the case that the hollow fiber membrane aeration and the aeration hole aeration or the jet flow aeration are alternately performed, after an obvious supernatant liquid layer appears on the surface layer of the sludge-water mixture of the microbial sludge and the sewage, the aeration hole aeration or the jet flow aeration is started within 5 minutes, and the operation time is controlled within 45 seconds.
In the method, the hollow fiber membrane is an oxygen increasing membrane with an oxygen increasing effect.
Furthermore, the device for realizing the aeration method of the biological sewage treatment at least comprises a biological treatment tank, a blower, a hollow fiber membrane aerator, an aeration hole aerator and an aeration regulation controller; the hollow fiber membrane aerator and the aeration hole aerator are arranged in the biological treatment tank, and gas inlets of the hollow fiber membrane aerator and the aeration hole aerator are connected with the side of the blower; the inlet pipeline of the aeration hole aerator is provided with a valve, and the opening and the openness of the valve are controlled by an aeration adjusting controller.
Furthermore, the device for realizing the aeration method of the biological sewage treatment at least comprises a biological treatment tank, a blower, a hollow fiber membrane aerator, a jet aerator and an aeration regulation controller; the hollow fiber membrane aerator and the jet aerator are arranged in the biological treatment tank, and gas inlets of the hollow fiber membrane aerator and the jet aerator are connected with the side of the blower; the inlet pipeline of the jet aerator is provided with a valve, and the opening and the openness of the valve are controlled by an aeration adjusting controller.
Furthermore, the device for realizing the aeration method of the biological sewage treatment comprises a hollow fiber membrane aerator, wherein the bottom end of the hollow fiber membrane aerator is fixed on a gas distribution pipe, air is supplied into the hollow fiber membrane from the gas distribution pipe, the air flows through the inside of the hollow fiber membrane and enters water from micropores on the side wall of the hollow fiber membrane, the parts except the bottom end of the hollow fiber membrane can freely swing, and the caliber of the top end of a hollow channel of the hollow fiber membrane is reduced or the opening of the top end channel is completely sealed.
Further, the device for realizing the aeration method of the biological sewage treatment comprises a hollow fiber membrane aerator, wherein the hollow fiber filaments of the hollow fiber membrane aerator are made of hydrophobic materials.
Further, the device for realizing the aeration method of the biological sewage treatment comprises that when the aeration hole aerator adopts an aeration disc, the aeration diameter of a single aeration hole aerator is smaller than 80mm, the edge distance of adjacent aeration hole aerators is larger than 600mm, when the aeration hole aerator adopts a tubular aerator, the diameter of a pipe is smaller than 40mm, and the edge distance of the adjacent tubular aerators is larger than 2000 mm.
The concrete description is as follows:
in the process of treating sewage by means of the biochemical capacity of microorganisms, oxygen needs to be provided for the microorganisms, and the microorganisms and the sewage can be in full contact. Aeration hole aeration or jet flow aeration is adopted in the traditional aeration mode, compressed air enters sewage in a bubble mode through a small hole formed in an aeration head (or called an aeration disc) or a small hole formed in a perforated aeration pipe with a hole formed in a circular pipe and flows upwards, so that oxygen is dissolved in the sewage to form stirring and mixing of sludge-water mixed liquid; the jet aeration is to utilize the fluid power of the sewage to suck air (sucking air from the atmosphere or sucking compressed air) through a jet aerator to form a gas-liquid mixed flow and guide the gas-liquid mixed flow into an aeration tank so as to increase the oxygen content in the liquid and play a role in stirring and mixing. The methods can provide oxygen and stir the sewage through the rising action of bubbles, so that the microorganisms can be well contacted with the sewage and the contact surface is updated, and the method becomes a mainstream method for aerobic treatment of the sewage. However, a large amount of air bubbles are generated in the conventional aeration mode, part of oxygen in the air bubbles is dissolved in water, and most of oxygen escapes to the atmosphere along with the rising of the air bubbles, so that the oxygen utilization rate is low, and the aeration cost is high. The hollow fiber membrane can realize bubble-free aeration, oxygen in the tube cavity is pushed by the oxygen partial pressure at two sides of the hollow fiber membrane to directly diffuse into the water outside the tube through the membrane wall or micropores on the membrane wall, namely the bubble-free aeration overcomes the defect of escape loss, and the utilization rate of oxygen can be improved.
The aeration of the hollow fiber membrane and the aeration through the aeration holes are alternatively or/and simultaneously carried out, the improvement of the oxygen utilization rate can be realized by the aeration of the hollow fiber membrane, the mixing of microorganisms and sewage is realized by the aeration of the aeration holes, and the treatment effect and the energy conservation are realized at the same time. The bubble-free aeration of the hollow fiber membrane can directly dissolve oxygen into water without generating bubbles visible to the naked eye, so that the hollow fiber membrane has the advantages of low energy consumption, high aeration efficiency and high oxygen utilization rate. However, the bubble-free aeration often cannot form the movement of water flow, so that the sedimentation of microorganism sludge is easily caused, the floating of the sludge and particle pollutants of a microorganism aggregate and the mass transfer process in the water body are not facilitated, and the sewage treatment effect is influenced. And bubbles generated by aeration or jet flow of the traditional aeration holes are beneficial to the floating of sludge and pollutants and the mass transfer process in water body. When the large bubble rises, turbulent flow can be formed and the water surface is violently turned over, so that the renewal of the liquid surface layer of the bubble and the process of absorbing oxygen from the atmosphere are enhanced. Turbulence that can form when the bubble rises also makes the contact between microorganism and dissolved oxygen and the pollutant three in the sewage more frequent, has promoted the microorganism and has utilized the dissolved oxygen and the efficiency improvement of the pollutant in the decomposition sewage.
The aeration of the hollow fiber membrane is mainly carried out in a mode of alternately carrying out the aeration of the hollow fiber membrane and the aeration hole or jet flow, and the aeration time of the hollow fiber membrane is longer than that of the aeration hole. In general, aeration-hole aeration or jet aeration is started within 5 minutes after sludge sedimentation (a significant supernatant layer appears on the surface layer of a sludge-water mixture of microbial sludge and sewage), and the aeration-hole aeration or jet aeration is controlled within 45 seconds. Therefore, the microorganisms in the sludge can decompose the surrounding pollutants by efficiently utilizing oxygen, the low-efficiency condition that the pollutants are decomposed completely and the pollutants can not be decomposed is avoided, and the condition that the pollutants needing to be decomposed by the microorganisms are enough but aerated frequently is avoided. The aeration holes have large aeration air quantity and strong stirring and mixing capability, so the aeration stirring can be mixed for more than 15 seconds, and the aeration stirring can be controlled within 45 seconds to be used as factors such as uneven installation in engineering application and the like to ensure sufficient stirring and mixing.
The two aeration modes of the hollow fiber membrane and the aeration hole aeration or the jet flow can be simultaneously carried out, under the condition that the two aeration modes are simultaneously carried out, the air quantity of aeration through the aeration hole is below 1/3 of the air quantity used by the pure aeration hole aeration, and under the condition that the two aeration modes of the hollow fiber membrane aeration and the jet flow aeration are simultaneously carried out, the air quantity of aeration through the jet flow is below 1/3 of the air quantity used by the pure jet flow aeration, so long as the stirring and mixing effects are ensured. In the case that the two aeration modes are simultaneously carried out, aeration hole aeration or jet aeration is alternately carried out at different positions of the biological treatment tank. Therefore, the instantaneous aeration flow can be reduced, the capacity scale of the blower is reduced, and the equipment investment and the operation cost are reduced.
Generally, the hollow fiber membrane is arranged in the vertical direction, the lower end of the hollow fiber membrane can be fixed, the upper end of the hollow fiber membrane is free, and the upper end and the lower end of the hollow fiber membrane can be fixed; the hollow fiber membranes may also be arranged horizontally or obliquely. The hollow fiber membrane is arranged in the vertical direction, the mode that the lower end is fixed and the upper end is free is low in cost, and the construction is simple and is the preferred mode.
The control of the opening and the flow rate of the traditional aeration hole aeration or jet flow aeration is realized by the control and the regulation of an aeration regulation controller.
In practical engineering, because aeration hole aeration or jet aeration is mainly used as a stirring and mixing means, the installation density of the aeration holes or the jet ejectors is much lower than that of the traditional aeration hole aeration or jet aeration. Although the hollow fiber membrane aeration equipment increases the equipment investment, the installation amount of aeration holes and ejectors is reduced, and the equipment investment is reduced by the equipment investment of a blower, and the equipment investment is reduced overall.
In summary, in the aspect of the combined use of hollow fiber membrane aeration and conventional aeration hole aeration or jet aeration, there can be a plurality of coupling modes: if the main blower can be arranged to synchronously supply air to the hollow fiber membrane pipeline and the aeration hole pipeline, the respective blowers can also be used for supplying air to the respective pipelines; the aeration time of different pipelines can be set to be different, and aeration holes or ejectors can be arranged to alternately aerate at different positions in the tank. The principle of the coupling modes is that when the hollow fiber membrane aeration is combined with the traditional aeration hole aeration or jet aeration to be carried out simultaneously, the hollow fiber membrane aeration is mainly used; when the two are alternately carried out, the aeration time of the aeration holes is compressed. Finally, the purposes of high oxygen dissolving efficiency, good sludge mixing effect, small gas consumption, gas saving and energy saving are achieved.
The hollow fiber membrane adopts an oxygen increasing membrane with oxygen increasing effect, and the oxygen dissolving effect can be further improved.
The invention has the advantages that the time alternation of the hollow fiber membrane aeration and the aeration hole aeration or the jet flow aeration or the alternation of different positions in the biological treatment tank not only improves the oxygen utilization rate and reduces the air consumption of aeration, but also realizes the good mixing of sewage and microorganisms, achieves good sewage treatment, reduces the operation cost and equipment investment and realizes the sewage treatment with low cost.
Drawings
FIG. 1: a schematic view of the aeration tank with the hollow fiber membrane and the aeration holes;
FIG. 2: the hollow fiber membrane and the aeration hole are combined to form an aeration tank, and the schematic diagram is seen from top;
FIG. 3: the aeration of the aeration holes is alternatively carried out at different positions of the biological treatment tank;
FIG. 4: the jet aeration is alternatively carried out at different positions of the biological treatment tank;
FIG. 5: schematic diagram of a top-tapered hollow fiber membrane;
FIG. 6: schematic view of closed-top hollow fiber membrane;
legend: 1-blower, 2-aeration pipe network, 3-biological treatment tank, 4-hollow fiber membrane, 5-hollow fiber membrane aeration regulation controller, 6-aeration hole aeration regulation controller, 7-aeration hole, 8-aeration hole aeration branch pipe control valve, 9-aeration hole aeration blower, 10-hollow fiber membrane aeration blower, 7-1-jet aerator, 11-jet aerator aeration control valve, 12-jet pump, 14-jet pump water inlet, 15-jet pump water outlet, 16-hollow fiber membrane pipe network branch pipe, 17-hollow fiber membrane interface, 18-hollow fiber membrane wire, 19-gradual shrinkage type top end, 20-bubble-free air, 21-closed top end.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example 1:
the present example is an example of biological sewage treatment by alternately performing aeration through hollow fiber membranes and aeration through aeration holes, and the process flow is shown in fig. 1 and fig. 2. The aeration process of the hollow fiber membrane and the aeration holes is combined, compressed air generated by an air blower 1 is sent into a biological treatment tank 3 through an aeration pipe network 2, passes through a hollow fiber membrane aeration control device 5, and enters a hollow fiber membrane 4 through a hollow fiber membrane pipe network branch pipe 16, so that bubble-free air 20 enters sewage, oxygen is dissolved in the sewage, and oxygen is supplied for microorganisms. Meanwhile, compressed air generated by the air blower 1 enters the aeration holes 7 through the aeration hole aeration control controller 6 and is filled with sewage, large bubbles are formed and rise towards the water surface, oxygen is dissolved in the sewage, meanwhile, the sewage and activated sludge formed by microorganisms are driven to form rolling water flow, and stirring and mixing of muddy water in the biological treatment tank 3 are realized. The aeration pipe network is flatly laid at the bottom of the biological treatment tank, and the hollow fiber membrane 4 and the aeration holes 7 are respectively arranged on pipe network branch pipes inside the biological treatment tank 3. The hollow fiber membrane 4 swings freely from bottom to top, as shown in fig. 5, the bottom end of the hollow fiber filament 18 is connected with the hollow fiber membrane pipe network branch pipe 16 through the hollow fiber membrane interface 17, and the other end is provided with a tapered top end 19. The aeration hole 7 is arranged at the bottom of the tank body. The hollow fiber membrane pipe network and the aeration hole pipe network are arranged at intervals, and gas inlets of the hollow fiber membrane pipe network and the aeration hole pipe network are connected with the side of the air blower.
When aeration is started, the hollow fiber membrane aeration control device 5 is firstly opened, the aeration hole aeration control device 6 is in a closed state, and the air blower 2 supplies oxygen required by microorganisms to the tank through the hollow fiber membranes 4. After a period of time for supplying oxygen, the hollow fiber membrane aeration control unit 5 is turned off, and the aeration hole aeration control unit 6 is turned on. The blower 2 supplies air bubbles into the tank through the aeration holes 7. The aeration time through the aeration holes is generally within 30 seconds, and the mud-water mixture is stirred and mixed. The rest time is the aeration time through the hollow fiber membrane.
The hollow fiber membrane aeration pipe in the tank can provide sufficient high-concentration oxygen for the biological treatment tank by alternately carrying out the hollow fiber membrane aeration and the aeration through the aeration holes. The aeration holes at the bottom of the tank can release enough bubbles to provide sufficient stirring for the water body in the tank. Aeration holes and hollow fiber membranes are alternately arranged in the tank, so that oxygen in the tank is uniformly distributed, and water in the tank is uniformly stirred. The total gas consumption can reach the aim of oxygen supply and stirring and mixing by 30 percent of the aeration dosage of the traditional aeration hole, and the high-efficiency and low-cost aeration is realized.
Example 2:
in this example, aeration is performed simultaneously by hollow fiber membrane aeration and aeration through aeration holes, and aeration through aeration holes is an aeration process performed alternately at different positions in a biological treatment tank, as shown in FIG. 3. Comprises an aeration hole aeration blower 9 and a hollow fiber membrane aeration blower 10, wherein compressed air blown out by the hollow fiber membrane aeration blower 10 enters a biological treatment tank through a hollow fiber membrane 4 to dissolve oxygen in sewage; compressed air that 9 blooms of aeration hole aeration blower is to aeration hole pipe network air feed, the aeration hole pipe network includes a plurality of branch pipes, 7 subregion of aeration hole of arranging in the biological treatment pond are supplied air respectively by each branch pipe, set up aeration hole aeration branch pipe control valve 8 respectively at every branch pipe inlet end, realize each branch pipe independent control, aeration hole aeration branch pipe control valve 8 of each branch pipe of aeration hole pipe network is the switching in turn, form the air feed that aeration hole aeration goes on in turn between biological treatment pond different positions, realize muddy water stirring and mixing in the biological treatment pond with a small amount of gas flow. The aeration time of the aeration holes at the same position is 20 seconds.
The aeration of the hollow fiber membrane in the tank can provide proper oxygen concentration, and the aeration of the aeration holes can provide proper stirring at different positions in the tank, thereby realizing high-efficiency and low-cost aeration.
Example 3:
this example is substantially the same as example 1, except that a blower is connected to each of the hollow fiber membrane pipe network and the aeration hole pipe network, and the pressure of compressed air blown by the blower for hollow fiber membrane aeration is about 0.1MPa higher than that of the blower for aeration hole aeration. When aeration is started, the valves of the hollow fiber membrane pipe network and the aeration hole pipe network are opened simultaneously, and the aeration air quantity through the aeration holes is 1/5-1/3 of the air quantity used by pure aeration hole aeration.
The hollow fiber membrane aeration pipe in the tank can provide sufficient high-concentration oxygen for the biological treatment tank. Meanwhile, the aeration holes at the bottom of the tank can release certain bubbles, so that sufficient stirring is provided for the water body in the tank, and the amount of air for aeration of the aeration holes can be greatly reduced. Thereby realizing high-efficiency and low-cost aeration.
Example 4:
this example is substantially the same as example 1, except that the hollow fiber membrane employs an oxygen increasing membrane having an oxygen increasing effect. When the air quantity supplied by the blower is the same, the oxygen increasing membrane is used to make the oxygen concentration in the gas phase entering the sewage reach 30%, so as to achieve higher oxygen dissolution and utilization rate. Therefore, the system using the oxygen increasing membrane needs less air at a certain oxygen demand, thereby further reducing the operation cost of aeration.
Example 5:
the present embodiment is basically the same as embodiment 2, except that the jet aerator 7-1 is used to replace aeration holes, and a jet pump 12 for jet flow is provided, the air sucked by jet flow is natural air, and the system is as shown in fig. 4, the jet pump 12 sucks a sludge-water mixture from the biological treatment tank as the inlet water 14 of the jet pump, sucks air by the jet pump 12, increases pressure, extrudes as the outlet water 15 of the jet pump, and alternately sends the outlet water to the jet aerator 7-1 through the jet aerator control valve 12 to enter the sewage mixed liquid in the biological treatment tank. The control valves of each branch pipe of the pipe network are opened and closed alternately to form alternate gas supply of jet aeration among different positions of the biological treatment tank, and the muddy water in the biological treatment tank is stirred and mixed with a small amount of gas flow. The aeration time of the aeration holes at the same position is 25 seconds.
The hollow fiber membrane aeration can provide sufficient high-concentration oxygen for the biological treatment tank, and the jet aerator can jet air, disturb water and provide sufficient stirring for the water. The jet aerator is arranged in the tank alternately, so that the oxygen in the tank is distributed uniformly, and the water in the tank is stirred uniformly. Thereby realizing high-efficiency and low-cost aeration.
Example 6:
the embodiment is basically the same as the embodiment 1, except that a jet aerator is used for replacing aeration holes, other systems are the same, only a jet water pump is arranged, and compressed air is also adopted as air sucked by jet, so that the water flow power consumption is reduced. Compressed air is introduced into the jet aerator in the biological treatment tank and then is ejected out by the jet aerator, so that the turbulence degree of the water body in the biological treatment tank can be improved, and the mass transfer process in the biological treatment tank is accelerated.
When aeration is started, the hollow fiber membrane is firstly started for aeration. After a significant supernatant layer appeared on the surface layer of the sludge-water mixture of the microbial sludge and the sewage, jet aeration was started within 5 minutes, and the operation time was controlled within 45 seconds.
Example 7:
this example is essentially the same as example 1, except that hollow fiber membrane filaments with closed tips are used instead of hollow fiber membrane filaments with tapered tips. As shown in FIG. 6, compressed air enters the hollow fiber membranes 4 through the hollow fiber membrane manifold branch pipes 16, thereby entering the sewage as bubble-free air 20 to dissolve oxygen in the sewage to supply oxygen to the microorganisms. The bottom end of the hollow fiber 18 is connected with the hollow fiber membrane pipe network branch pipe 16 through a hollow fiber membrane interface 17, and the other end is provided with a closed top end 21.

Claims (9)

1. An aeration method for biological sewage treatment is characterized in that: oxygen supply to the biological treatment tank is realized by the following method:
aeration is carried out alternately or simultaneously through the hollow fiber membrane and the aeration holes;
or alternatively performing or simultaneously performing hollow fiber membrane aeration and jet aeration at the bottom of the biological treatment tank;
or a combination of the above.
2. The method of claim 1, wherein: in the case where the two aeration modes are alternately performed, the aeration time by the hollow fiber membrane is longer than the operation time of the other methods.
3. The method of claim 1, wherein: under the condition that the hollow fiber membrane aeration and the aeration hole aeration or the jet flow aeration are alternately carried out, the aeration through the aeration hole or the jet flow aeration are alternately carried out at different positions of the biological treatment tank.
4. A method as claimed in claim 1 or 3, characterized by: under the condition that the hollow fiber membrane aeration and the aeration hole aeration or the jet flow aeration are alternately carried out, after an obvious supernatant layer appears on the surface layer of the sludge-water mixture of the microbial sludge and the sewage, the aeration hole aeration or the jet flow aeration is started within 5 minutes, and the operation time is controlled within 45 seconds.
5. The method of claim 1, wherein: when the two aeration modes of the hollow fiber membrane aeration and the aeration hole aeration are simultaneously carried out, the aeration air quantity through the aeration hole is below 1/3 of the air quantity used by the pure aeration hole aeration; when the two aeration modes of hollow fiber membrane aeration and jet aeration are simultaneously carried out, the air quantity of the jet aeration is below 1/3 of the air quantity used by the pure jet aeration.
6. An apparatus for carrying out an aeration method for biological treatment of wastewater according to claim 1, characterized in that: at least consists of a biological treatment tank, a blower, a hollow fiber membrane aerator, an aeration hole aerator and an aeration regulation controller; the hollow fiber membrane aerator and the aeration hole aerator are arranged in the biological treatment tank, and gas inlets of the hollow fiber membrane aerator and the aeration hole aerator are connected with the side of the blower; the inlet pipeline of the aeration hole aerator is provided with a valve, and the opening and the openness of the valve are controlled by an aeration adjusting controller;
the hollow fiber membrane aerator is a hollow fiber filament with the bottom end fixed on the air distribution pipe, supplies air into the hollow fiber membrane from the air distribution pipe, flows through the inside of the hollow fiber filament and enters water from the micro-pores on the side wall of the hollow fiber membrane, the parts except the bottom end of the hollow fiber filament can freely swing, and the caliber of the top end of the hollow channel of the hollow fiber filament is reduced or the opening of the top end channel is completely sealed.
7. An apparatus for carrying out an aeration method for biological treatment of wastewater according to claim 1, characterized in that: at least consists of a biological treatment tank, a blower, a hollow fiber membrane aerator, a jet aerator and an aeration regulation controller; the hollow fiber membrane aerator and the jet aerator are arranged in the biological treatment tank, and gas inlets of the hollow fiber membrane aerator and the jet aerator are connected with the side of the blower; the inlet pipeline of the jet aerator is provided with a valve, and the opening and the openness of the valve are controlled by an aeration adjusting controller;
the hollow fiber membrane aerator is a hollow fiber filament with the bottom end fixed on the air distribution pipe, supplies air into the hollow fiber membrane from the air distribution pipe, flows through the inside of the hollow fiber filament and enters water from the micro-pores on the side wall of the hollow fiber membrane, the parts except the bottom end of the hollow fiber filament can freely swing, and the caliber of the top end of the hollow channel of the hollow fiber filament is reduced or the opening of the top end channel is completely sealed.
8. The apparatus of claim 6 or 7, wherein: the hollow fiber filaments of the hollow fiber membrane aerator are made of hydrophobic materials.
9. The apparatus of claim 6, wherein: under the condition that the aeration hole aerator adopts the aeration disc, the aeration diameter of a single aeration hole aerator is smaller than 80mm, the edge interval of adjacent aeration hole aerators is larger than 600mm, the pipe diameter is smaller than 40mm and the edge interval of adjacent pipe aerators is larger than 2000mm under the condition that the tubular aerator is adopted by the aeration hole aerator.
CN202010245934.7A 2020-03-31 2020-03-31 Aeration method and device for biological sewage treatment Pending CN111333205A (en)

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Publication number Priority date Publication date Assignee Title
CN112487603A (en) * 2020-10-09 2021-03-12 同济大学 Blast aeration system oxygenation capacity change determination method and system based on big data
CN112897822A (en) * 2021-04-21 2021-06-04 中原环保郑州设备工程科技有限公司 Combined sewage treatment device and sewage treatment method for layered aeration

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EP2239234A1 (en) * 2009-03-09 2010-10-13 Shenzen JDL Environmental Protection Ltd. Jet aeration apparatus and wastewater treatment process

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CN101024539A (en) * 2007-02-05 2007-08-29 哈尔滨工业大学 Integrated bubble-free aeration biological composite film film-separation biological reactor
EP2239234A1 (en) * 2009-03-09 2010-10-13 Shenzen JDL Environmental Protection Ltd. Jet aeration apparatus and wastewater treatment process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112487603A (en) * 2020-10-09 2021-03-12 同济大学 Blast aeration system oxygenation capacity change determination method and system based on big data
CN112487603B (en) * 2020-10-09 2022-06-14 同济大学 Blast aeration system oxygenation capacity change determination method and system based on big data
CN112897822A (en) * 2021-04-21 2021-06-04 中原环保郑州设备工程科技有限公司 Combined sewage treatment device and sewage treatment method for layered aeration

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Application publication date: 20200626