CN212982721U - High-efficiency biological denitrification device for sewage with low carbon-nitrogen ratio - Google Patents
High-efficiency biological denitrification device for sewage with low carbon-nitrogen ratio Download PDFInfo
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- CN212982721U CN212982721U CN202021186886.0U CN202021186886U CN212982721U CN 212982721 U CN212982721 U CN 212982721U CN 202021186886 U CN202021186886 U CN 202021186886U CN 212982721 U CN212982721 U CN 212982721U
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Abstract
The utility model discloses a high-efficiency biological denitrification device for sewage with low carbon-nitrogen ratio, which comprises a water inlet well, a water source to be treated, an anoxic zone, an aerobic zone and a return sludge pump room are connected together by connecting a water inlet pipe, an anoxic zone internal reflux system, an aerobic zone internal reflux system and an external reflux pipe, and is characterized in that the anoxic zone is provided with an intensive packing zone near the rear end of the aerobic zone; the part below the dense packing area and close to the aerobic area is provided with a perforated mud pipe for discharging mud to a mud storage pool, the aerobic area is divided into a plurality of galleries, each gallery is internally and uniformly provided with an aeration device and four aerobic area flow pushers, an aeration system runs in an intermittent aeration-flow pushing mode, the middle section of the aerobic area is provided with an ammonia nitrogen analyzer, and the tail end of the aerobic pool is provided with a reflux system in the aerobic area. The utility model discloses under the condition that sewage factory intake low carbon nitrogen ratio is serious on the low side, add or not add the carbon source outward less, can realize high standard denitrogenation, the efficiency of getting rid of nitrate nitrogen improves to 100%.
Description
Technical Field
The utility model relates to a high-efficient carbon nitrogen device for low carbon nitrogen ratio sewage belongs to sewage treatment technical field.
Background
With the acceleration of the urbanization process, the industrial industry is gradually increased, the living standard quality of people is gradually improved, the water environment problem is increasingly shown, the pollutant emission requirement is more and more strict, and particularly, the special emission limit standard is set for the nitrogen and phosphorus indexes of sewage emission. Phosphorus removal can be achieved by physical and chemical dosing, but nitrogen index removal has more limitations.
The denitrification effect of the traditional sewage treatment plant process is limited by more boundary conditions, and the method specifically comprises the following steps:
1. the denitrification of the traditional process is realized by increasing the external reflux and the internal reflux flow, so that the denitrification efficiency is further increased, and therefore, the process has certain limitations: firstly, the internal reflux amount of the traditional sewage project is designed to be 400% under the normal condition, and the theoretical denitrification formula is adopted
The theoretical value of denitrification efficiency is 83.33%. When the internal and external reflux quantities are further increased, the increase range of the denitrification efficiency is very limited, and meanwhile, the larger internal reflux quantity also causes influence on the anoxic environment, so that the current environment situation cannot be met. Secondly, the increase of the internal and external reflux amount can cause the energy consumption to be greatly increased, and the cost of sewage treatment is increased.
2. The denitrification effect is limited by the carbon source of the inlet water, and when the carbon-nitrogen ratio of the inlet water is less than 3, the denitrification effect of the system is extremely poor. The problem is more obvious in cities in south China, even if the carbon-nitrogen ratio of water inlet of some sewage projects for months is less than 3, the supply of a denitrification carbon source is insufficient, and the denitrification of the system is limited. Meanwhile, the national standard for sewage discharge limit is repeatedly raised, the effluent execution standard is strict, and a sewage plant can only ensure the denitrification effect of the system through an external carbon source, so that the water treatment cost is increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the urban sewage treatment plant is affected by the low carbon-nitrogen ratio of sewage to the biological denitrification efficiency.
In order to solve the technical problem, the utility model provides a high-efficient biological denitrification device for sewage with low carbon-nitrogen ratio, which comprises a water inlet well, a water inlet pipe, an anoxic zone internal reflux system, an aerobic zone internal reflux system and an external reflux pipe, wherein the water source to be treated, the anoxic zone, the aerobic zone and a reflux sludge pump room are connected together by the water inlet well, the anoxic zone internal reflux system comprises a perforated sludge discharge pipe, an anoxic zone reflux pump and an anoxic zone reflux pipe; the aerobic zone internal reflux system comprises an aerobic zone reflux pump and an aerobic zone reflux channel, a water inlet well is connected with the anoxic zone, the anoxic zone and the aerobic zone through water through holes, and the tail end of the aerobic zone is provided with a water outlet weir and a water outlet pipe for discharging treated water; the part below the dense packing area and close to the aerobic area is provided with a perforated mud pipe for discharging mud to a mud storage pool, the aerobic area is divided into a plurality of galleries, each gallery is internally and uniformly provided with an aeration device and four aerobic area flow pushers, an aeration system runs in an intermittent aeration-flow pushing mode, the middle section of the aerobic area is provided with an ammonia nitrogen analyzer, and the tail end of the aerobic pool is provided with a reflux system in the aerobic area.
Preferably, the dense packing area adopts fixed bed type packing.
More preferably, the dense filler area is in a divergent needle type, and the placing distance between two adjacent bundles of fillers is less than 5 cm.
In the dense filling area, under the water conservancy interception effect of the filling, the water conservancy flow velocity in the area is sharply reduced, and at the middle end of the dense filling area, the flow velocity is less than 0.3 m/s; and naturally layering the muddy water, allowing the supernatant and part of sludge mixed liquor to enter an aerobic unit, and intercepting most of sludge at the bottom of the filling area.
The dense packing area has richer microbial population, because the arrangement of the packing provides a carrier for the propagation of the microbes, a large number of attached microbes are arranged on the packing, and a favorable living environment is provided for a large number of anaerobic microbes such as lactic acid bacteria, potassium acetate, methane bacteria and the like which are trapped at the bottom.
Preferably, the sludge concentration in the anoxic zone is controlled to be 12000mg/L, and the f value is not lower than 40%.
The sludge concentration of the dense packing area is increased from top to bottom, the sludge concentration is different in the precipitation type at the vertical position of the dense packing area due to the difference of the sludge concentration, the upper part is free precipitation, the lower part is layered precipitation, and a large amount of sludge accumulation can occur at the bottom, and anaerobic hydrolysis can occur in the area. Anaerobic hydrolysis, i.e., facultative bacteria, can secrete extracellular enzymes to the outside of the body, hydrolyzing the macromolecular solid and colloidal substances into soluble substances that can be absorbed by the bacteria. Then the anaerobic bacteria suck the soluble substances into the cells to continue catabolism, mainly producing some fatty acids and volatile alcohols, and further providing a required carbon source for denitrification.
Preferably, the reflux ratio of the reflux system in the anoxic zone is 10-30%, which is adjusted according to the height condition of the mud layer at the bottom of the anoxic pond end. The sludge in the anoxic tank is periodically discharged through the perforated sludge discharge pipe, because the f value of the anoxic tank gradually decreases along with the reaction, and the inert solid substances can be discharged out of the system along with the sludge through the periodic discharge of the sludge, so that the biochemical reaction in the anoxic tank is more efficient.
Preferably, the anoxic zone is divided into two lattices, and a guide wall with one horizontally arranged surface is arranged in each lattice respectively, and the main function of the anoxic zone is to uniformly mix the fluid in the tank so as to achieve a good plug flow effect.
More preferably, both sides of the guide wall close to the first lattice of the water inlet well in the anoxic zone are respectively provided with a first anoxic zone flow pusher which is symmetrically distributed; two sides of the flow guide wall of the other grid are respectively provided with a second anoxic zone flow impeller which is symmetrically distributed; the length ratio of the front pool body to the rear pool body of the anoxic zone impeller I to the anoxic zone impeller II is 5: 7.
and the aerobic zone determines the aeration time of the system according to the data of the middle ammonia nitrogen instrument. In the aeration stage, most of the carbon source in the inlet water is utilized by denitrifying bacteria in the anoxic pond, so that the carbon source cannot be completely utilized by organic pollutants such as BOD20, BOD30 and the like, and the required dissolved oxygen is extremely limited. The main purpose of aeration is to complete the nitration reaction, so the aeration time can be controlled according to the ammonia nitrogen value in the middle section of the aerobic tank.
Preferably, the aerobic zone adopts an intermittent aeration mode of alternately operating aeration and plug flow; when the oxygen nitrogen numerical value of good oxygen pond interlude reaches below 1mg/L, stop the aeration stage, good oxygen pond begins to carry out the plug flow, at this moment, good oxygen pond back end can regard as back oxygen deficiency unit to use, along with the reaction goes on, usable carbon source consumes almost, the microorganism can only consume self carbon source through endogenous respiration and carry out the metabolism, for the denitrification denitrogenation provides the carbon source, in order to reach better denitrogenation effect, can stop adding the carbon source in a small amount at good oxygen pond aeration stage, make play water denitrogenation efficiency reach further rising, theoretical denitrogenation efficiency can reach 100%. Therefore, the lower the ammonia nitrogen numerical control at the middle section of the aerobic tank is, the higher the theoretical denitrification efficiency of the system is. The ammonia nitrogen value in the middle section of the aerobic tank is not easy to exceed 5mg/L, and the risk of exceeding the ammonia nitrogen is possible to exist. The mode realizes the intermittent aeration synchronous denitrification, increases the residence time of denitrification in the plug flow stage, further reduces organic pollutants such as BOD20, BOD30 and the like which can not be completely utilized by denitrifying bacteria in the inlet water, and further improves the denitrification efficiency.
Preferably, the sludge concentration MLSS of the aerobic zone is controlled to be 3500-4500mg/L, wherein the f value is not lower than 40%.
Preferably, the reflux ratio in the aerobic zone is 100 percent, and the adjustment is carried out according to the sludge concentration in the anoxic zone and the denitrification requirement; and after mud water discharged to the secondary sedimentation tank from the water outlet pipe is subjected to mud-water separation in the secondary sedimentation tank, part of sludge flows back to the water inlet pipe through a return sludge pump, and the external reflux ratio is controlled to be 80-100% according to the sludge concentration in the biochemical tank.
Preferably, the ammonia nitrogen instrument in the aerobic zone is arranged in the middle of the process.
Preferably, the arrangement of the aerobic zone aeration system is uniformly arranged in the whole pool.
An internal reflux system in the aerobic zone uses an internal reflux channel to convey nitrifying liquid; compared with the pipeline, the channel has less hydraulic loss and is easier to maintain.
Preferably, the sludge passing through the dense filler zone is divided into three parts, wherein one part of the sludge enters the aerobic zone along with the water flow, the other part of the sludge is deposited at the bottom of the dense filler zone for anaerobic hydrolysis, the third part of the sludge realizes circulation along with the water flow direction, and denitrification reaction denitrification is continuously carried out in the anoxic tank.
The sludge concentration is higher in the dense filler area, the microbial flora structure, the type and the quantity are richer, the sewage treatment effect is better, the denitrification effect is more stable and more thorough, and an external carbon source is not needed. The perforated sludge discharge pipe enables inert solid matters to be discharged out of the system along with sludge, the biochemical reaction in the anoxic tank is more efficient, the perforated sludge discharge pipe is connected with a return system in the anoxic zone to return organic matters generated by anaerobic hydrolysis to a water inlet end, the organic matters directly participate in denitrification reaction, and the activated sludge anaerobic hydrolysis is used as a secondary carbon source to be utilized again. Simultaneously, denitrifying bacteria can preferentially utilize the quick carbon source of intaking to carry out denitrification reaction in the oxygen deficiency pond, and along with the reaction goes on, the utilizable carbon source in the oxygen deficiency pond consumes totally, and the microorganism can only consume self carbon source through endogenous respiration and carry out the metabolism, provides the secondary carbon source for denitrification denitrogenation. Therefore, even in the case of unbalanced nutrition and low carbon nitrogen ratio of the inlet water, the microorganisms can still utilize carbon sources generated by hydrolysis and endogenous respiration to carry out normal denitrification. In the denitrification process, the sludge concentration in the anoxic tank is correspondingly reduced, so that the activated sludge is recycled, and the sludge production is reduced. Because the aerobic zone uses intermittent aeration, the influence of the internal reflux on the anoxic zone is small.
The utility model discloses compare with traditional technology, can effectively reduce sewage treatment plant's operation energy consumption.
The traditional process mainly completes denitrification in an anoxic zone according to a theoretical denitrification formula
It is known that the conventional process further increases the denitrification efficiency by increasing the flow rates of the external reflux and the internal reflux. The utility modelThe denitrification of the type patent is mainly realized in a plug flow stage of an anoxic zone and an aerobic zone, wherein the calculation of the denitrification efficiency of the anoxic zone is consistent with that of the traditional process; the plug flow stage of the aerobic zone can theoretically realize 100 percent of denitrification efficiency. Firstly, completing nitration reaction in an aeration stage of an aerobic zone, converting ammonia nitrogen into nitrate nitrogen, stopping aeration after the ammonia nitrogen in the middle section of the aerobic zone is completely converted into the nitrate nitrogen, and starting plug flow to realize an anoxic denitrification function. Therefore, the internal and external reflux amounts only need to meet the requirement of sufficient sludge concentration in the anoxic zone, and compared with the traditional process, the denitrification requirement is met, and the operation energy consumption of the internal and external reflux pumps is greatly reduced.
The aerobic zone of a common sewage treatment plant operates in a continuous aeration mode, and the aeration energy consumption accounts for about 40 percent of the total energy consumption of the sewage treatment plant. Operating in an intermittent aeration mode, and stopping an aeration stage when the ammonia nitrogen value in the middle section of the aerobic zone reaches below 1 mg/L; when the ammonia nitrogen value in the middle section of the aerobic zone is increased to 5mg/L, the aeration is started. The aeration system is intermittently and repeatedly opened and closed, so that the aeration energy consumption of the aerobic zone can be effectively reduced. The operation energy consumption is greatly reduced while high-standard denitrification is ensured.
The aerobic zone of a common sewage treatment plant operates in a continuous aeration mode, and the aeration energy consumption accounts for about 40 percent of the total energy consumption of the sewage treatment plant. Operating in an intermittent aeration mode, and stopping an aeration stage when the ammonia nitrogen value in the middle section of the aerobic zone reaches below 1 mg/L; when the ammonia nitrogen value in the middle section of the aerobic zone is increased to 5mg/L, the aeration is started. The aeration system is intermittently and repeatedly opened and closed, so that the aeration energy consumption of the aerobic zone can be effectively reduced. The operation energy consumption is greatly reduced while high-standard denitrification is ensured.
Simultaneously, the utility model discloses the carbon source that the endogenous breathing of microorganism in anoxic zone and the aerobic zone produced provides the secondary carbon source for the denitrification, makes the denitrification reaction more thorough. Thereby reducing the sludge amount, reducing the sludge treatment cost and reducing the sewage treatment cost.
The utility model discloses a microbial community structure, kind, quantity have great difference than traditional technology, make the sewage treatment project better, and the denitrification effect is more stable, more thorough, need not plus carbon source.
The utility model discloses each regional sludge concentration has great difference than traditional technology, and each regional sludge concentration of traditional technology is roughly equal, the utility model discloses each regional sludge concentration has obvious difference, and good oxygen district 3500mg/L is to 4500mg/L between, and anoxic zone 12000mg/L, intensive packing district is higher than other regions in anoxic zone, has strengthened the denitrification of system by a wide margin in stable system nitration.
The utility model discloses realization denitrification denitrogenation function that can be better under the condition that adds or not add the carbon source outward less, realizes high standard denitrogenation, gets rid of the theory of nitrate nitrogen and improves 100%. Meanwhile, the operation energy consumption is greatly reduced, the output of excess sludge is reduced, and the sewage treatment cost is effectively reduced.
To sum up, compared with the prior art, the utility model, have following beneficial effect:
1. breaks through the bottleneck of the theoretical denitrification technology and improves the removal efficiency of the nitrate nitrogen to 100 percent.
2. Under the condition that the ratio of carbon to nitrogen of inlet water of a sewage plant is seriously low, namely when the ratio of carbon to nitrogen is less than 3, a carbon source is added or not added, and high-standard denitrification can be realized.
3. The aerobic zone operates in an intermittent aeration-plug flow mode, so that the operation energy consumption is greatly reduced while high-standard denitrification is ensured.
4. The sludge is reduced, the sludge treatment cost is reduced, and the sewage treatment cost is reduced.
Drawings
FIG. 1 is a front view of the high efficiency biological denitrification apparatus for sewage with low carbon-nitrogen ratio provided by the present invention;
FIG. 2 is a perspective view of FIG. 1;
FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 1;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 1;
fig. 5 is a cross-sectional view of plane C-C of fig. 1.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1-5, for the utility model provides a pair of a high-efficient biological denitrification device for sewage with low carbon-nitrogen ratio, it is including the inlet well 18 that distributes in proper order, anoxic zone and good oxygen district, inlet well 18 is respectively through inlet tube 1, anoxic zone back flow 3, the pending water source is connected to return channel 15 in the good oxygen district, anoxic zone, good oxygen district, inlet well 18 bottom still connects the sludge pump room through outer back flow 4, be equipped with anoxic zone backwash pump 8 on the anoxic zone back flow 3, be equipped with good oxygen district backwash pump 13 on the return channel 15 in the good oxygen district, the anoxic zone leads to good oxygen district through the water tunnel, good oxygen district bottom is equipped with outlet pipe 14 that is used for being connected with two heavy ponds, it has aeration equipment 17 to distribute in the good oxygen district. The anoxic zone is divided into two lattices in the horizontal direction, one side of the upper part of one lattice close to the aerobic zone is provided with a perforated pipe 9 connected with the anoxic zone return pipe 3, the other side is provided with a dense packing zone 16, and one side of the dense packing zone 16 close to the aerobic zone is provided with a perforated sludge discharge pipe 10; an ammonia nitrogen analyzer 12 is arranged in the aerobic zone.
The middle part of one lattice of the anoxic zone close to the water inlet well 18 is provided with a pair of anoxic zone plug movers I5, and the middle part of the other lattice is provided with a pair of anoxic zone plug movers II 6; the aerobic zone is divided into three galleries, and each gallery is provided with four aerobic zone flow pushers 11.
And guide walls 7 with one horizontally arranged surface are respectively arranged in the two anoxic zones.
The dense packing area 16 adopts fixed bed type packing; or the filler is a divergent needle-shaped filler, and the placing distance between two adjacent bundles of fillers is less than 5 cm.
The reflux liquid in the anoxic zone enters the water inlet well 18 through the anoxic zone reflux pipe 3 under the action of the anoxic zone reflux pump 8, the reflux liquid in the aerobic zone enters the water inlet well 18 through the aerobic zone internal reflux channel 15 under the action of the aerobic zone reflux pump 13, the reflux sludge in the sludge pump room enters the water inlet well 18 through the external reflux pipe 4 under the action of the sludge reflux pump, and the reflux liquid, the anoxic zone reflux pump and the sludge reflux pump are mixed together and then enter the anoxic zone through the water gap 2. The main function of the two flow impellers in the anoxic zone is to make water circularly flow, and under the action of the flow impellers, the anoxic zone is a half-plug flow half-mixing flow reactor. The sludge concentration is controlled to be about 12000mg/L, and the f value is not lower than 40%. After the mixed liquid enters the first grid, the mixed liquid and the original water in the pool circularly run in the pool to carry out denitrification. Then enters into the second grid through the water passing hole, the sewage is the same as the first grid in the second grid, and circulates in the water.
After the mixed liquid enters the dense filling area 16, the water conservancy flow velocity in the area is sharply reduced under the water conservancy interception effect of the filling, and the flow velocity of the mixed liquid is less than 0.3m/s at the middle end of the dense filling area 16. After the mixed liquid enters the dense filler area 16, the water conservancy flow velocity in the area is sharply reduced under the water conservancy interception effect of the filler, muddy water is naturally layered at the middle end of the dense filler area 16, supernatant and part of the mixed liquid of sludge pass through the dense filler area 16 and then are divided into two parts, one part of the mixed liquid enters the aerobic area through a water passing hole, the other part of the mixed liquid circularly runs in the anoxic area, the settled sludge is divided into two parts, one part of aged sludge is discharged to a sludge storage tank through a perforated pipe 10 for sludge treatment, and the other part of the aged sludge is collected through a perforated pipe 9 and then flows back to the water inlet pipe 1 through an anoxic area reflux pump 3. The concentration of the settled sludge is higher than that of the sludge in other areas of the anoxic zone, the sludge can even be settled, and the anaerobic hydrolysis phenomenon can occur in the area at the moment to generate a rapid carbon source. The reflux and sludge discharge are controlled according to the sludge condition of the dense packing area, and the reflux ratio is generally controlled to be 10-30%. The rapid carbon source carried by the return sludge can be preferentially utilized by denitrifying bacteria to carry out denitrification reaction. As the reaction proceeds, the available carbon source in the anoxic zone is consumed, and the microorganisms can only consume the self carbon source through endogenous respiration to carry out metabolism, so that a secondary carbon source is provided for denitrification.
In the aerobic zone, whether the aerobic zone needs aeration is judged according to the data of the ammonia nitrogen instrument 12. The aeration device 17 adopts an intermittent aeration mode for aeration. Under the aeration state, the incoming water normally carries out nitration reaction in the aerobic zone, when the ammonia nitrogen concentration of the middle section is less than or equal to 1mg/L, the aeration system stops, the incoming water advances by pushing the flow under the action of the flow impeller 11 of the aerobic zone, at the moment, the aerobic zone is in a low dissolved oxygen environment, denitrification reaction occurs in the biological tank, namely, the area of the anoxic zone is increased, the denitrification time is prolonged, and the denitrification effect is further enhanced. The ammonia nitrogen concentration in the middle section is kept below 5mg/L as much as possible in the operation process, otherwise, the danger of exceeding the ammonia nitrogen is existed. The sludge concentration MLSS of the aerobic zone is generally controlled between 3500mg/L and 4500mg/L, wherein the f value is not less than 40 percent. The internal reflux ratio can be adjusted according to the sludge concentration and denitrification requirements of the anoxic zone, the control is generally about 100 percent, because the aerobic zone uses intermittent aeration, the dissolved oxygen overflowing from the aerobic zone is less, and the influence of the internal reflux on the anoxic zone is less.
After the sludge water discharged to the secondary sedimentation tank from the water outlet pipe 14 is subjected to sludge-water separation in the secondary sedimentation tank, part of sludge flows back to the water inlet pipe 1 through the return sludge pump, and the external reflux ratio is controlled to be 80-100% according to the sludge concentration in the biochemical tank.
Claims (6)
1. A high-efficiency biological denitrification device for sewage with low carbon-nitrogen ratio comprises a water inlet well, a water source to be treated, an anoxic zone, an aerobic zone and a return sludge pump room are connected together by connecting a water inlet pipe, an anoxic zone internal return system, an aerobic zone internal return system and an external return pipe, wherein the anoxic zone internal return system comprises a perforated sludge discharge pipe (10), an anoxic zone return pump (8) and an anoxic zone return pipe (3); the aerobic zone internal reflux system comprises an aerobic zone reflux pump (13) and an aerobic zone reflux channel (15), a water inlet well (18) is connected with the anoxic zone, the anoxic zone and the aerobic zone through water through holes, and the tail end of the aerobic zone is provided with a water outlet weir and a water outlet pipe for discharging treated water, and the aerobic zone internal reflux system is characterized in that the rear end of the anoxic zone close to the aerobic zone is provided with a dense packing zone (16); the part of intensive filler district (16) below near the good oxygen district has been arranged and is used for arranging perforation mud pipe (10) to the mud storage pond with mud, good oxygen is divided into a plurality of galleries, and the equipartition has aeration equipment (17) and four good oxygen district impeller (11) in every gallery, and aeration system adopts intermittent aeration-mode operation of plug flow, and good oxygen district middle section is equipped with an ammonia nitrogen analysis appearance (12), and good oxygen pond end is equipped with the interior reflux system of good oxygen district.
2. The apparatus for the efficient biological denitrification of wastewater with a low carbon-nitrogen ratio as recited in claim 1, wherein the dense packing region (16) uses fixed bed packing.
3. The device for the efficient biological denitrification of sewage with low carbon-nitrogen ratio as recited in claim 2, characterized in that the dense packing area (16) is of a divergent needle type, and the arrangement distance between two adjacent bundles of packing is less than 5 cm.
4. The apparatus of claim 2, wherein the fixed bed type packing is provided with attached microorganisms.
5. The apparatus for the high efficiency biological denitrification of wastewater with a low carbon-nitrogen ratio as claimed in claim 1, wherein the anoxic zone is divided into two compartments, each compartment being provided with a horizontally arranged guide wall (7).
6. The high-efficiency biological denitrification device for the sewage with the low carbon-nitrogen ratio of claim 5, characterized in that two sides of the guide walls (7) close to one grid of the water inlet well (18) in the anoxic zone are respectively provided with anoxic zone plug flow devices (5) which are symmetrically distributed; two sides of the flow guide wall (7) of the other grid are respectively provided with a second anoxic zone flow pusher (6) which is symmetrically distributed; the length ratio of the front pool body to the rear pool body of the anoxic zone impeller I (5) to the anoxic zone impeller II (6) is 5: 7.
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