CN109912029B - Self-flowing internal circulation aerobic granular sludge continuous flow reactor - Google Patents
Self-flowing internal circulation aerobic granular sludge continuous flow reactor Download PDFInfo
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Abstract
The invention discloses a self-flow internal circulation aerobic granular sludge continuous flow reactor for treating domestic sewage, wherein inoculated sludge is mature aerobic granular sludge cultured by SBR. The reactor comprises a cylindrical main body reactor, a water inlet system, a drainage system, aeration equipment, stirring equipment and two organic glass pipes, wherein the two organic glass pipes are arranged on two sides of the main body reactor and are used as an anaerobic zone and a settling zone. Sewage enters from the top of the anaerobic zone, granular sludge slides into the aerobic zone from the bottom after the granular sludge passes through the downward acting force of the stirring blades, muddy water rises under the action of aeration, and the depth of the baffle plate at the top of the anaerobic zone can adjust the amount of the muddy water flowing into the anaerobic zone, so that self-flowing internal circulation is realized. In the reactor, sufficient shearing action is provided through stirring and aeration of different functional zones, the hydrophobicity of cells can be effectively improved, the secretion of EPS is promoted, and a very good synchronous nitrogen and phosphorus removal function can be realized in a continuous flow mode of long-term operation.
Description
The technical field is as follows:
the invention is suitable for the field of biological sewage treatment, in particular to the starting of a continuous flow aerobic granular sludge process, the efficient synchronous nitrogen and phosphorus removal of urban domestic sewage and the recovery of the performance of granular sludge.
Background art:
aerobic granular sludge has been proposed as an effective and innovative technology for wastewater treatment, excellent settleability and high biomass concentration aerobic granular sludge. Is an attractive wastewater treatment technology because it has many incomparable advantages over activated sludge, such as compact structure, high settling capacity, and resistance to high organic loads and toxicity. In addition, the high biomass retention capacity enhances the volumetric conversion capability, thereby enabling the system to handle high organic loading rates. The aerobic granular sludge provides an ideal place for facultative and aerobic microorganism symbiosis. The microorganisms including various ammonia oxidizing bacteria and denitrifying bacteria are used as a kind of microorganism self-agglomeration body, and have the characteristics of high biological activity, various species and layered growth of microorganisms. The technology realizes various incomparable advantages of traditional activated sludge such as simultaneous denitrification and dephosphorization under aerobic conditions, is considered to be a wastewater biological treatment technology with great development prospect, but the instability of aerobic granular sludge and almost all the single reactor form of an SBR reactor can realize sludge-water separation in the same reactor, but the defects of low SBR volume utilization rate, large head loss, discontinuous water outlet, high peak oxygen demand, low equipment utilization rate, complex operation control and inapplicability to large water amount greatly limit the application and development of the technology, so that the aerobic granular sludge technology still does not realize large-scale engineering application so far. But continuous flow operation can realize continuous water treatment, has the advantages of floor area saving and simple operation control, and has less reports on a reactor for culturing aerobic granular sludge and treating sewage in a continuous water inlet mode at present. Therefore, an integrated reactor with a sewage treatment function, which occupies a small area and operates efficiently, is urgently needed.
In addition, in view of the lack of stability of the common continuous flow aerobic granular sludge reactor, a single aeration or intermittent aeration mode does not provide good survival growth conditions for the aerobic granular sludge, and in the reactor, an anaerobic zone is additionally arranged, and self-flow internal circulation is realized according to the structure of the anaerobic zone, so that granules are further stabilized and effectively granulated. And built-in high-efficient sedimentation tube, fine avoided leading to the not good problem of separation effect when gas, liquid, solid three-phase separate in same reactor among the current reactor, the effectual separation and the selective mud of arranging of carrying out gas-liquid-solid. And moreover, the sedimentation pipe is arranged in the inner cavity of the reactor main body, so that the occupied area and the operation and management cost can be saved.
The invention content is as follows:
in order to solve the above-described problems, the present invention provides a self-flowing internally circulating high-efficiency aerobic granular sludge continuous flow reactor, which is a self-circulating integrated reactor, and because the continuous flow granular sludge reactor usually has the problems of difficult start-up, easy disintegration, unstable treatment efficiency and the like when treating sewage, the present invention provides a self-flowing internally circulating continuous flow reactor, and in one reactor, three environments of an aerobic zone, an anaerobic zone and a settling zone formed inside the reactor can be utilized. Sewage is pumped from a water inlet tank to the upper end of the reactor through a peristaltic pump, water enters the anaerobic zone through an organic glass tube, downward acting force is generated on muddy water under the rotation of a stirrer with blades, the muddy water flows into the main body reactor through the bottom structure of the anaerobic zone under the anaerobic stirring reaction, the muddy water enters the aerobic zone, the muddy water rises under the aeration action condition of the aerobic zone, the muddy water rises to the top of the reactor, the muddy water enters the anaerobic zone after entering an overflow port according to an opening in the top of the anaerobic zone, and gas is discharged from the system at the top. The muddy water flows into the aerobic zone through the anaerobic zone and then flows into the anaerobic zone through the aerobic zone, thereby realizing the self-flowing internal circulation. And the size of the opening at the top can be controlled by inserting the depth of the baffle plate at the top of the anaerobic zone, so that the amount of muddy water flowing into the anaerobic zone in the aerobic zone is controlled, and the degree of the self-flowing internal circulation is controlled. The function of the settling zone is to realize the separation of liquid and solid, and supernatant in the settling zone flows out of the system. Researches show that the water inlet mode can influence the culture of urban sewage enhanced denitrification aerobic granular sludge, in the reactor, the denitrification of the granular sludge is promoted by an anaerobic stirring mode after water is fed, the stability of a continuous flow system and the granular sludge is enhanced by changing the self-flowing internal circulation effect of sewage through the depth of water inlet of an anaerobic section and the insertion depth of a baffle plate, MLSS is effectively promoted to form long-distance circular flow, the sludge flows through different substrate concentration conditions and different DO conditions, sufficient shearing force is provided through stirring and aeration, flocculent sludge is facilitated to generate more EPS, and the hydrophobicity of the cell surface is improved, so that the formation of the granular sludge is promoted. Effectively saves the occupied area, reduces the cost and improves the efficiency of synchronous nitrogen and phosphorus removal.
The technical solution of the patent of the invention is as follows:
a self-flowing internal circulation efficient aerobic granular sludge reactor and an operation method thereof are disclosed: in the figure, 1-a cylindrical pipe wall of a built-in high-efficiency settling pipe, 2-a water outlet (a sampling port) of the built-in high-efficiency settling pipe, 3-a spherical surface of the built-in high-efficiency settling pipe, 4-a zigzag arc groove at the lower part of the pipe wall of the built-in high-efficiency settling pipe, 5-a water inlet part of a main body SBR reactor, 6-the main body SBR reactor, 7-a wrapped aeration cake, 8-a water outlet (a sampling port) of the main body SBR reactor, 9-a water inlet tank, 10-a water inlet peristaltic pump, 11-an air compressor, 12-a water discharge tank, 13-a gas flowmeter, 14-a stirrer, 15-a cylindrical pipe wall of a built-in anaerobic zone, 16-a bottom surface of the built-in anaerobic zone, 17-a zigzag arc groove at the lower part of the built-in anaerobic zone, 18-a top opening of the built-in anaerobic pipe, 19-a baffle, and 20-a top arc groove (an overflow port) is built-in the anaerobic zone.
Comprises a reactor main body: the diameter of the pipe with the built-in anaerobic zone is 80mm, one side of the wall of the reactor is stuck on the wall of the main reactor, and the wall of the side is provided with a sampling port.
A hollow organic glass tube with the diameter of 30mm and the length of 100mm is taken, a semicircular arc groove is cut along the vertical direction of the diameter and is stuck to the inner side of the organic glass tube in the anaerobic zone to be used as an overflow port. The outer wall is provided with a square small hole with the width of 10mm and the length of 40 mm.
And a baffle is arranged on the outer side and is used for flowing the muddy water in the aerobic zone into the anaerobic zone when the muddy water rises to the top, and the self-flowing internal circulation degree is controlled according to the depth of insertion of the baffle. In the built-in settling tube, the diameter of the settling tube is 40mm, one side of the settling tube is adhered to a main reactor, the wall of the main body is provided with a sampling port and a water outlet which correspond to a water inlet system and a water discharge system, nine sludge discharge ports are uniformly arranged on one side of the wall of the main body, the distance between the nine sludge discharge ports is 100mm and is lower than the highest height of the liquid level of the reactor, a water inlet pump lifts sewage into a biological treatment unit, an anoxic zone and an anaerobic zone of the biological treatment unit are provided with stirrers, oxygen provided by an air blower enters an aerobic zone through an aerator, degradation of pollutants is completed together under the action of microorganisms, and the oxygen release process is increased when the water inlet end is the anaerobic or anoxic zone in reflux.
The periphery of the edge-covered aeration cake 7 is provided with an edge covering which is 5.0mm higher than that of the aeration cake.
It is characterized in that: the edge-covered aeration cake 7 can make gas flow directionally, and the gas cannot diffuse all around, so that large bubbles generated by aeration can be effectively prevented from entering the built-in high-efficiency sedimentation pipe device, and the sedimentation effect is influenced.
The invention is provided with a plurality of water outlets (sampling ports), and sludge discharge positions can be reasonably arranged according to the sludge concentration of the reactor and the effect of water treatment, and sludge discharge is carried out from the corresponding sampling ports.
The granular sludge method of the invention has the advantages that: (1) the reactor operates in a continuous water inlet and continuous water outlet mode; (2) the three functional areas are separated by a reactor, and self-flowing internal circulation is formed inside the system. (3) And has high-efficiency precipitation function.
Description of the drawings:
FIG. 1 is a block diagram of the present invention
In the figure, 1-a cylinder with a built-in high-efficiency settling tube, 2-a water outlet (a sampling port) with a built-in high-efficiency settling tube, 3-a spherical surface with a built-in high-efficiency settling tube, 4-a zigzag arc groove at the lower part of the tube wall of the built-in high-efficiency settling tube, 5-a water inlet of a main body SBR reactor, 6-a main body SBR reactor, 7-a covered aeration cake, 8-a water outlet (a sampling port) of the main body SBR reactor, 9-a water inlet tank, 10-a water inlet peristaltic pump, 11-an air compressor, 12-a water discharge tank, 13-a gas flowmeter, 14-a stirrer, 15-a cylindrical tube wall with a built-in anaerobic zone, 16-a bottom surface with a built-in anaerobic zone, 17-a zigzag arc groove at the lower part of the built-in anaerobic zone, 18-a top opening of the built-in anaerobic tube, 19-a baffle, and 20-a top arc groove are built-in the anaerobic zone.
FIG. 2 is a front view, a top view and a side view of a built-in anaerobic zone
FIG. 3 is a front, top and side view of the built-in settling zone
FIG. 4 is a bottom detail view of the built-in anaerobic zone and built-in settling zone of the present invention
FIG. 5 shows the specific design operation method of the bottom of the built-in anaerobic zone and the built-in settling zone
Description of the drawings: finding a point A on the tube wall, cutting the tube wall of the built-in efficient settling tube along the ABC surface, finding a point D corresponding to the point A, cutting the tube wall by the same method, and removing the curved surface ABC and the curved surface DBC to obtain the tube bottom of the built-in efficient settling tube.
FIG. 6 is a further optimization of the openings of the built-in anaerobic zone and the built-in settling zone
Description of the drawings: a part of the pipe wall of the built-in efficient settling pipe is cut off for specific description, and because the pipe wall has a certain thickness, the pipe wall can be cut by laser along the direction of HK, namely, 45 degrees obliquely upwards, and the cut surface is HIJK, and the cutting mode has the advantages that: the opening part at the bottom of the pipe has the characteristic of small opening and large internal space, and in a settling zone, gas can be better prevented from entering the internal efficient settling pipe, so that granular sludge can better flow out of the settling pipe. In the anaerobic zone, gas can be well prevented from entering the internal efficient settling tube, so that granular sludge can better flow out of the settling tube, and self-flowing internal circulation can be better realized.
In fig. 7, a is a front oblique view of a detailed model of the top opening of the organic glass tube in the anaerobic zone
b is a top-down oblique view of the detailed model of the top opening of the organic glass tube in the anaerobic zone
c is an oblique view of the organic glass tube model in the anaerobic zone
The specific implementation mode is as follows:
as shown in figure 1, the invention relates to a self-flowing internal circulation aerobic granular sludge continuous flow reactor, which comprises a reactor main body, a water inlet system, a stirring device, an aeration system, a drainage system and a self-flowing internal circulation system.
The diameter of the SBR reactor body is 200mm, the diameter of the organic glass tube of the built-in anaerobic zone is 80mm, and through tests, the self-flowing internal circulation effect is the best when the insertion depth of the baffle is 100mm away from the top.
The bottom of the anaerobic zone is an upward convex spherical surface, so that gas can be prevented from entering, and the anaerobic stirring effect is better enhanced.
Meanwhile, the structure at the bottom of the anaerobic zone can enable the granular sludge in the anaerobic zone to better flow out of the anaerobic zone, meanwhile, the flowing granular sludge rises along the pipe wall under the action of aeration, and part of the sludge-water compound entering from the anaerobic zone and part of the sludge-water compound flowing out from the sedimentation pipe enter the anaerobic zone again through the depth inserting distance of the baffle plate under the condition of aerobic aeration for a period of time, so that the self-flowing internal circulation process of the aerobic granular sludge is realized.
Through the experiment, when built-in settling tube diameter was 40mm, it is easier for mud-water separation, and pipe wall one side of built-in settling tube glues on main part reactor inner wall, and the bottom is bellied sphere that makes progress, sneaks into gas in can the effectual prevention settling tube, and in a similar way, bellied sphere that makes progress makes granular sludge flow out the settling tube more easily, at the inner chamber mesocycle, provides good shearing force for granular sludge in the inner chamber to the granular sludge of smooth compact structure has been formed.
In addition, the water inlet is designed to be in a zigzag arc groove shape, the inner surface of the arc groove is a plane with an upward inclination, so that the bottom of the settling tube has the characteristics of small water inlet and large inner space, the gas is not favorably entered and the granular sludge flows out favorably, and the bottom of the anaerobic zone is designed to be in the same way, so that the granular sludge is better entered from the top opening of the anaerobic zone and flows out from the bottom, and the self-flowing internal circulation is realized.
The main reactor is provided with three living places of the granular sludge, an aerobic zone anaerobic zone and a sedimentation zone under three environments, so that the stability of the granular sludge is improved, the synchronous nitrogen and phosphorus removal function of the granular sludge is enhanced, and the quality of effluent is improved.
The reactor main part on with 100 mm's even being provided with delivery port and the sample connection that drainage system corresponds nine respectively of distance, the water inlet that water intake system corresponds is one, set up a plurality of purposes and arrange the mud position according to reactor mud concentration and the effect rational arrangement of the effect of handling water, arrange mud and go on from the sample connection.
The diameter of the aeration cake 7 is 120mm, the aeration cake is positioned at one side of the bottom of the inner cavity of the reactor main body 6, and the anaerobic zone is positioned at the upper part of the aeration cake and fixed on the wall of the reactor. The built-in high-efficiency settling tube 1 is positioned at the other side of the inner cavity and is fixed on the wall of the reactor, and the horizontal distance from the bottom of the built-in high-efficiency settling tube to the edge-covered aeration cake 7 is 30 mm. The height of the edge covering of 5mm is arranged around the aeration cake, the aeration direction can be controlled, and the phenomenon that the sedimentation effect of granular sludge is influenced because gas directly enters the built-in efficient sedimentation pipe can be avoided.
This experimental apparatus gas-liquid circulation is fast, and the separation effect is good, and granular sludge's production rate is high, and the processing energy consumption is low, and it is stable to go out water, sets up anaerobic zone aerobic zone and settling zone in the main part reactor and has increased granular sludge's survival condition and has improved the treatment effeciency and promoted water quality of water and save area.
A high-efficiency aerobic granular sludge continuous flow reactor comprises the following specific working steps:
(1) domestic sewage in the domestic sewage storage tank enters the anaerobic zone from the upper part of the anaerobic zone in the main reactor through a constant flow, anaerobic stirring is carried out for a period of time, then mud water flows out of the main reaction zone through a special structure at the bottom of the anaerobic zone for aerobic reaction, synchronous nitrogen and phosphorus removal is carried out on the sewage through granular sludge, and then the partially mixed mud water rises under the action of aeration and enters the anaerobic zone through an opening at the top of the anaerobic zone so as to finish the self-flowing internal circulation. And in addition, part of the sludge-water mixed liquor sinks to the bottom, enters the built-in efficient settling tube 1 through the zigzag arc groove to perform sludge-water separation, granular sludge with excellent settling performance returns to the aerobic reaction zone, and treated water overflows from the upper part of the efficient settling tube and enters the water outlet pool.
(2) This device sets up nine delivery ports and sample connection 2 respectively in the both sides of reactor, arranges the mud position according to the effect rational arrangement of reactor sludge concentration and treated water, and the mud of row goes on from the sample connection.
(3) The aeration of the device is supplied by a large-scale air compressor and is monitored in real time through a gas flowmeter.
The invention operates in the following way:
the device takes domestic sewage as inflow water, and the average value of water quality is as follows: COD is 300mg/L, TN is 30mg/L, and pH is 6.5-8.0. The water inflow is 72L/d, the inoculated sludge is aerobic granular sludge cultured in the laboratory, and the organic load is about 1.0 kgCOD/(m)3·d)
Domestic sewage is added into the reactor by a peristaltic pump, the water inlet flow is 2.5L/h, aeration is carried out through the aeration cake, and the aeration rate is 1.0-2.0L/min.
After 2 weeks, the aerobic granular sludge is cultured, and the integrated continuous flow aerobic granular sludge reactor can stably operate.
The method is used for continuous operation for 60 days, the particle size in the reactor is mainly more than 1100 microns, and the sludge SV30 is changed from 40% to 20%, settling time less than 3min, COD and BOD5The removal rates of the components respectively reach 95 percent and 99 percent, the TN of effluent is less than 6mg/L, and the TP is less than 0.4 mg/L.
Experiments prove that the reactor and the operation method are obviously superior to the prior non-continuous flow aerobic granular sludge method, the sewage treatment effect is good, and the efficiency is greatly improved.
In the figure 3, the bottom of the pipe is designed to be a part of a spherical surface which protrudes upwards and has the radius of 60mm, the diameter of a spherical tangent plane is 60mm, a water inlet which is formed by the contact of the pipe bottom and the pipe wall is designed to be a sawtooth arc groove with the bottom edge of 80mm and the height of 50mm, and the inner surface of the arc groove is an inclined surface which inclines upwards by 45 degrees. FIG. 4 illustrates: finding a point A on the tube wall, cutting the tube wall of the built-in efficient settling tube along the ABC surface, finding a point D corresponding to the point A, cutting the tube wall by the same method, and removing the curved surface ABC and the curved surface DBC to obtain the tube bottom of the built-in efficient settling tube. FIG. 5 is an optimization of the section of the built-in high-efficiency precipitation tube; a part of the pipe wall of the built-in efficient settling pipe is cut off for specific explanation, and because the pipe wall has a certain thickness, the pipe wall can be cut by laser along the direction of HK, namely, 45 degrees above the pipe wall in an inclined way, and the cut surface is HI JK.
Claims (3)
1. A self-flowing internal circulation aerobic granular sludge continuous flow reactor device is characterized in that: comprises an SBR main body reactor, a water inlet system, a drainage system, an aeration device and a stirring device; the SBR main body reactor is divided into an anaerobic zone, an aerobic zone and a settling zone, the reactor main body matched with the anaerobic zone and the settling zone is a hollow organic glass tube with the height of 1000mm and the diameter of 180mm, and the anaerobic zone and the settling zone are internally provided with detachable cylindrical hollow organic glass tubes; one side of the organic glass tube in the anaerobic zone is vertically adhered to the wall of the main reactor, the diameter of the organic glass tube in the anaerobic zone is 80mm, a square small hole is formed in the top of the other side of the organic glass tube in the anaerobic zone, and a baffle is arranged on the outer side of the organic glass tube; controlling the size of the opening according to the depth of the baffle;
sewage is pumped from a water inlet tank to the upper end of an SBR main reactor through a peristaltic pump, water is fed into an organic glass tube in an anaerobic zone, a stirrer with blades rotates to generate a downward acting force on muddy water, the muddy water flows into the main reactor through a bottom structure of the anaerobic zone under the anaerobic stirring reaction and enters an aerobic zone, the muddy water rises under the action of aeration of the aerobic zone, when the muddy water rises to the top of the reactor, the muddy water firstly enters an overflow port through an opening in the top of the anaerobic zone and then enters the anaerobic zone, and gas is discharged out of the system at the top; the mud water flows into the aerobic zone through the anaerobic zone and then flows into the anaerobic zone through the aerobic zone, so that the self-flowing internal circulation is realized; the size of the opening at the top is controlled by inserting depth of a baffle plate at the top of the anaerobic zone, so that the amount of muddy water flowing into the anaerobic zone from the aerobic zone is controlled, and the degree of self-flowing internal circulation is controlled; settling the granular sludge in the settling pipe, sliding the granular sludge into a main reaction area of the main SBR reactor, and enabling the effluent to flow into a drainage tank along a water outlet of the settling pipe to realize the separation of liquid and solid;
a hollow organic glass tube with the diameter of 30mm and the length of 100mm is taken from the inner side of the water inlet of the anaerobic zone, and a semicircular arc groove is cut along the vertical direction of the diameter and is stuck to the inner side of the organic glass tube of the anaerobic zone to be used as an overflow port;
the organic glass tube bottom structure of anaerobic zone: firstly, beveling a sawtooth arc groove with the arc length of the bottom edge of 120mm and the height of 80mm on the front side and the back side of the bottom of the organic glass tube respectively, wherein the inner surface of the arc groove is an inclined surface which is inclined upwards by 45 degrees and is used as a water inlet for an anaerobic zone to flow to an aerobic zone; and a part of a spherical surface which is convex upwards and has a radius of 100mm is stuck below the sawtooth-shaped arc groove, and the diameter of the section of the spherical surface is 100 mm.
2. The apparatus of claim 1, wherein: the diameter of the built-in settling tube is 40.0mm, and the built-in settling tube is inserted on the side wall of the reactor main body; the bottom surface of the spherical surface at the bottom is upwards convex and is a part of the spherical surface with the radius of 60.0mm, the diameter of the spherical section is 60.0mm, and a water inlet, which is contacted with the pipe wall, at the bottom of the built-in sedimentation pipe is designed into a zigzag arc groove with the arc length of the bottom edge of 80.0mm and the height of 50.0 mm; the inner surface of the arc groove is an inclined surface which is inclined upwards by 45 degrees and is used as a water inlet of the anaerobic zone flowing to the sedimentation pipe.
3. The device as claimed in claim 1, wherein a square small hole with a width of 10mm and a length of 40mm is opened on the top of the other side of the organic glass tube in the anaerobic zone, and a baffle is arranged on the outer side; the size of the opening is controlled according to the depth of the baffle.
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