CN117534213A - Low-carbon sewage treatment process for efficient denitrification - Google Patents
Low-carbon sewage treatment process for efficient denitrification Download PDFInfo
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- CN117534213A CN117534213A CN202311604749.2A CN202311604749A CN117534213A CN 117534213 A CN117534213 A CN 117534213A CN 202311604749 A CN202311604749 A CN 202311604749A CN 117534213 A CN117534213 A CN 117534213A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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Abstract
The invention provides a low-carbon sewage treatment process for high-efficiency denitrification. The low-carbon sewage treatment process adopts anaerobic-aerobic-nitrosation anaerobic ammonia oxidation-aerobic advanced treatment-precipitation, so that high-efficiency denitrification is realized, organic carbon is saved, the oxygen consumption and the alkalinity consumption are greatly reduced, and the generation of dry sludge is reduced; in addition, compared with the traditional activated sludge method, the method can reduce the release amount of carbon dioxide by about 30%, and realize the comprehensive purposes of energy conservation, emission reduction and consumption reduction.
Description
[ field of technology ]
The invention relates to the field of sewage treatment, in particular to a low-carbon sewage treatment process for efficient denitrification.
[ background Art ]
The sewage treatment process generally needs to remove organic matters, phosphorus, nitrogen and other substances in the sewage, and the existing sewage treatment process mostly adopts an activated sludge method, a membrane biological reaction technology and the like.
The activated sludge method is adopted to easily generate a large amount of sludge and easily generate sludge expansion in practical application, so that the treatment cost is increased; in the nitrogen removal step, organic carbon needs to be additionally added to react with nitrogen oxides in sewage, so that the problem that the nitrogen removal effect is poor due to imbalance of the carbon-nitrogen ratio is easy to occur, the nitrogen removal efficiency is low, and sewage treatment is easy to be substandard.
The aeration amount of the membrane biological reaction technology system is large, and the energy consumption is high; accumulation of refractory organics is liable to cause inhibition of microorganisms and contamination of the membrane; the membrane component has higher cost, high operation cost, high system control requirement and complex operation management.
In view of this, the present inventors have conducted intensive studies on the above problems, and have produced the present invention.
[ invention ]
The invention aims to provide a low-carbon sewage treatment process with high denitrification efficiency, no need of adding additional organic carbon and high reaction stability.
The invention is realized in the following way: a high-efficiency denitrification low-carbon sewage treatment process comprises the following steps:
step one: anaerobic reaction, arranging combined filler and sludge in an anaerobic tank, introducing sewage, and staying the sewage in the anaerobic tank for 1.5-3.5h; the sludge contains hydrolytic bacteria, acidifying bacteria, methanogens and phosphorus accumulating bacteria;
step two: the sewage after the primary aerobic reaction flows into a first aerobic tank, a first suspension filler and sludge are arranged in the first aerobic tank, and the sewage stays in the first aerobic tank for 3-5h;
step three: the nitrosation-anaerobic ammonia oxidation reaction is carried out, sewage after primary aerobic reaction flows into a nitrosation coupling anaerobic ammonia oxidation tank, and the sewage stays in the nitrosation coupling anaerobic ammonia oxidation tank for 8-10h; the nitrosation coupling anaerobic ammonia oxidation tank comprises a nitrosation tank and an anaerobic ammonia oxidation tank, wherein fixed filler and sludge are arranged in the nitrosation tank, and anaerobic flexible filler and sludge are arranged in the anaerobic ammonia oxidation tank; the anaerobic ammonia oxidation tank is positioned in the nitrosation tank and above the bottom of the nitrosation tank, and the sewage forms a flowing circulation channel between the nitrosation tank and the anaerobic ammonia oxidation tank;
step four: the sewage after the nitrosation anaerobic ammoxidation reaction flows into a second aerobic tank, a second suspension filler and sludge are arranged in the second aerobic tank, and the sewage stays in the second aerobic tank for 1-2h;
step five: and (3) performing flocculation precipitation reaction, wherein sewage after secondary aerobic reaction flows into a sedimentation tank, sludge is compressed to the bottom of the sedimentation tank through flocculation reaction and gravity sedimentation, and clear water flows out from the upper part of the sedimentation tank, so that sewage purification is completed.
Further, in the first step, the combined filler is one or more of a braid, a plastic fiber, a plastic thread and a fiber bundle.
Further, in the second step, the first suspension filler is one or more of a sponge filler and a high-density polyethylene filler.
Further, in the third step, the fixed filler is one or more of porous rod-shaped filler, semi-flexible filler, combined filler and braided curtain filler; the anaerobic flexible filler is suspended filler, and one or more of the anaerobic flexible filler sponge filler and the high-density polyethylene filler.
Further, the nitrosation pond comprises a top wall, a pond bottom, a first side wall, a second side wall, a third side wall, a fourth side wall and a partition plate; one end of the partition board is fixedly connected with the first side wall, the other end of the partition board is fixedly connected with the third side wall, a gap is formed between the top surface of the partition board and the top wall, and a gap is formed between the top surface of the partition board and the bottom of the pool; the anaerobic ammonia oxidation tank is formed between the partition plate and the second side wall; the anaerobic ammonia oxidation tank further comprises an upper grid mesh and a lower grid mesh which are fixedly connected between the partition plate and the second side wall.
Further, through holes for sewage to pass through are formed in the upper grid mesh and the lower grid mesh, and the aperture of the through holes is smaller than the particle size of the anaerobic flexible filler.
Further, in the fourth step, the second suspension filler is one or more of a sponge filler and a high-density polyethylene filler.
Further, a nitrifying liquid reflux device for refluxing part of nitrifying liquid generated by the second aerobic reaction to the anaerobic tank is arranged at the outlet of the second aerobic tank.
In the fifth step, a sludge reflux device for refluxing part of sludge to the inside of the anaerobic tank is further arranged at the outlet of the sedimentation tank.
Further, the anaerobic tank, the first aerobic tank, the nitrosation coupling anaerobic ammonia oxidation tank, the second aerobic tank and the sedimentation tank are communicated through overflow pipes.
The invention has the advantages that:
1. in the low-carbon sewage treatment process, corresponding fillers are arranged in the anaerobic reaction, the first aerobic reaction, the nitrosation anaerobic ammoxidation reaction and the second aerobic reaction, so that the microbial attachment is improved, the stability of a reaction tank is improved, and the problems of sludge loss, sludge expansion, sludge decomposition and the like in the sewage treatment process are prevented; and the tolerance of the functional strain can be improved, the domestication time of the functional microorganism is shortened, and the method is suitable for the change of different water qualities and different water quantities of sewage.
2. The design of the nitrosation coupling anaerobic ammonia oxidation tank ensures that nitrosation anaerobic ammonia oxidation reaction is carried out in the same reactor, ensures the continuity of the reaction, is beneficial to transferring intermediate products of pollutant reaction, and integrally improves the efficiency of the two reactions; and two reactions in the nitrosation pool and the anaerobic ammonia oxidation pool are separated by the grid mesh to form two relatively independent and linked reaction processes, so that competition of corresponding microorganisms is avoided, the respective optimal conditions of the two reactions can be better controlled, the synergistic treatment of nitrosation-anaerobic ammonia oxidation is realized, and the aim of low-carbon sewage treatment is fulfilled.
3. The low-carbon sewage treatment process adopts anaerobic-aerobic-nitrosation anaerobic ammonia oxidation-aerobic advanced treatment to realize high-efficiency denitrification, the reaction can reduce the oxygen demand, the addition of nutrient substances is reduced, the generation of sludge is greatly reduced, and the aim of low-carbon sewage treatment is fulfilled.
[ description of the drawings ]
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
FIG. 1 is a flow chart of the low carbon sewage treatment process of the invention.
FIG. 2 is a plan view of the low carbon sewage treatment apparatus of the present invention.
FIG. 3 is a schematic diagram of the structure of a nitrosation-coupled anaerobic ammonia oxidation tank in the present invention.
FIG. 4 is a cross-sectional view of a nitrosation-coupled anaerobic ammonium oxidation tank in accordance with the present invention.
FIG. 5 is a schematic diagram of the structure of the sedimentation tank in the present invention.
Low-carbon sewage treatment device 100, anaerobic tank 1,
A first aerobic tank 2,
Nitrosation coupling anaerobic ammonium oxidation tank 3, nitrosation tank 31, top wall 311, tank bottom 312, first side wall 313, second side wall 314, third side wall 315, fourth side wall 316, fixed packing 317, anaerobic ammonium oxidation tank 32, anaerobic flexible packing 321, partition 33, and,
A second aerobic tank 4,
A sedimentation tank 5, a guide cylinder 51, an overflow weir 52, a clear water outlet 53,
Overflow pipe 6,
An upper grid 71, a lower grid 72,
A nitrified liquid reflux device 8, a first reflux pipe 81, a reflux pump 82, a second reflux pipe 83,
A sludge recirculation device 9, a first sludge discharge pipe 91, a sludge pump 92, a third recirculation pipe 93, and a second sludge discharge pipe 94.
[ detailed description ] of the invention
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1 to 5, in the present invention, a low carbon sewage treatment apparatus 100 includes an anaerobic tank 1, a first aerobic tank 2, a nitrosation-coupled anaerobic ammonia oxidation tank 3, a second aerobic tank 4, and a sedimentation tank 5. The anaerobic tank 1, the first aerobic tank 2, the nitrosation coupling anaerobic ammonia oxidation tank 3, the second aerobic tank 4 and the sedimentation tank 5 are communicated through an overflow pipe 6. In the present invention, the residence time represents the volume of the reaction tank, for example, the treatment flow rate is 1m 3 And/h, residence time of 6 hours, indicating that the reaction tank design is 6m 3 Is of a size of (2); the residence time of the anaerobic tank 1, the nitrosation tank and the anaerobic ammoxidation tank 32 is agreed to be approximately (1.5-3.5): 6-8): 2-4, which represents the proportion of the size of the tank body.
The anaerobic tank 1 and the first aerobic tank 2 mainly remove organic matters, and the first aerobic tank 2 also has the function of dephosphorization. The nitrosation coupling anaerobic ammonia oxidation tank 3 realizes the effect of high-efficiency denitrification. The second aerobic tank 4 mainly carries out secondary deep denitrification on the basis of nitrosation-anaerobic ammonia oxidation. Anaerobic filler, first suspension filler of the first aerobic tank 2 and second suspension filler of the second aerobic tank 4 are all aerobic fillers filled in the anaerobic tank 1 so as to improve microorganism adhesion.
The invention also provides a low-carbon sewage treatment process for high-efficiency denitrification, which is applied to the low-carbon sewage treatment device 100 and comprises the following steps:
step one: anaerobic reaction, arranging combined filler and sludge in an anaerobic tank 1, introducing sewage, and staying the sewage in the anaerobic tank 1 for 1.5-3.5h; the sludge contains hydrolytic bacteria, acidifying bacteria, methanogenic bacteria and phosphorus accumulating bacteria and is attached to the combined filler.
The sewage enters an anaerobic tank 1, and hydrolytic bacteria, acidizing bacteria and methanogenic bacteria decompose organic matters in the sewage and convert the organic matters into inorganic matters and other gases through metabolism. Meanwhile, the phosphorus accumulating bacteria can fully release the polyphosphate in the cell body under the anaerobic condition, and finally flows into the first aerobic tank 2 along with sewage. In order to ensure that the anaerobic reaction is fully carried out, the sewage stays in the anaerobic tank 1 for at least 2-3 hours. The combined filler is one or more of braid belts, plastic fibers, plastic threads and fiber bundles. The arrangement of the combined filler enables various microorganism bacteria to be attached to the combined filler, and sludge bulking caused by excessive propagation of the microorganism bacteria can be reduced.
Step two: and (3) performing primary aerobic reaction, wherein the sewage subjected to the anaerobic reaction flows into a first aerobic tank 2, a first suspension filler and sludge are arranged in the first aerobic tank 2, and the sewage stays in the first aerobic tank 2 for 3-5h. The sludge contains aerobic microorganisms, and phosphorus accumulating bacteria absorb phosphorus in sewage under the aerobic condition of the first aerobic tank 2, convert the phosphorus into polymeric phosphate in cells, and form biological sludge through metabolism, thereby playing a role in dephosphorization. The first suspension filler is one or more of sponge filler and high-density polyethylene filler.
Step three: the nitrosation anaerobic ammonia oxidation reaction is carried out, sewage after primary aerobic reaction flows into a nitrosation coupling anaerobic ammonia oxidation tank 3, and the sewage stays in the nitrosation coupling anaerobic ammonia oxidation tank 3 for 8-10h; the nitrosation coupling anaerobic ammonia oxidation tank 3 comprises a nitrosation tank 31 and an anaerobic ammonia oxidation tank 32, wherein fixed fillers and sludge are arranged in the nitrosation tank 31, and the sludge contains ammonia oxidizing bacteria; anaerobic flexible filler 321 and sludge are arranged in the anaerobic ammonia oxidation tank 32, and the sludge contains anaerobic ammonia oxidation bacteria; the anaerobic ammonia oxidation tank 32 is positioned inside the nitrosation tank 31 and above the bottom of the nitrosation tank 31, and the sewage forms a circulating channel flowing between the nitrosation tank 31 and the anaerobic ammonia oxidation tank 32.
In the third step, the fixed filler 317 is one or more of porous rod-shaped filler, semi-flexible filler, combined filler and braided curtain filler; the anaerobic flexible filler 321 is a suspension filler, and one or more of the anaerobic flexible filler sponge filler and the high-density polyethylene filler. The porous rod-like filler is preferably an alumina ceramic or aluminosilicate material.
In step three, the nitrosation tank 31 includes a top wall 311, a bottom 312, a first sidewall 313, a second sidewall 314, a third sidewall 315, a fourth sidewall 316, and a partition 33; one end of the partition plate 33 is fixedly connected with the first side wall 313, the other end of the partition plate 33 is fixedly connected with the third side wall 315, a gap is formed between the top surface of the partition plate 33 and the top wall 311, and a gap is formed between the top surface of the partition plate 33 and the pool bottom 312; the anaerobic ammonium oxidation tank 32 is formed between the partition 33 and the second side wall 314, and the anaerobic ammonium oxidation tank 32 further includes an upper grill 71 and a lower grill 72 fixedly connected between the partition 33 and the second side wall 314. The sewage inlet of the nitrosation tank 31 is located at one side between the inner partition 33 and the fourth side wall 316. In order to avoid the outflow of the anaerobic flexible filler 321, through holes for the sewage to pass through are formed in the upper and lower grill nets 71 and 72, the pore diameter of the through holes is smaller than the particle diameter of the anaerobic flexible filler 321, and the pore diameter of the through holes is smaller than the particle diameter of the fixed filler 317.
The actual working time is as follows: the sewage enters the nitrosation tank 31 and then directly flows to the bottom of the nitrosation tank 31 and reacts with the fixed filler 317 and the sludge in nitrosation reaction, the sewage reacts with the sludge attached to the fixed filler, pollutants in the sewage are flocculated and adsorbed by the sludge, and ammonia nitrogen is converted into nitrite nitrogen under the action of ammonia oxidizing bacteria in the sludge; the sewage flows down from a sewage inlet above the nitrosation pool 31, the sewage at the bottom of the nitrosation pool 31 enters the anaerobic ammonia oxidation pool 32 from the bottom of the lower grid mesh 72 by the impact force of water flow and reacts with suspended anaerobic flexible filler 321 and sludge, and ammonia nitrogen and nitrite nitrogen are converted into nitrogen by anaerobic ammonia oxidation bacteria in the sludge; then flows out from the top of the upper grid 71 into the upper part of the interior of the nitrosation pool 31, flows between the partition 33 and the fourth side wall 316, flows to the bottom of the nitrosation pool 31, and circulates for a plurality of times.
The nitrosation coupling anaerobic ammonia oxidation tank 3 has at least the following beneficial technical effects:
1. the design of the nitrosation coupling anaerobic ammonia oxidation tank 3 ensures that the nitrosation reaction and the anaerobic ammonia oxidation reaction are carried out in the same reactor, ensures the continuity of the reaction, is beneficial to transferring intermediate products of pollutant reactions and integrally improves the efficiency of the two reactions. Meanwhile, two reactions in the nitrosation tank 31 and the anaerobic ammonia oxidation tank 32 separate the filler through grid meshes to form two relatively independent and linked reaction processes, so that competition of corresponding microorganisms is avoided, the respective optimal conditions of the two reactions can be better controlled, the synergistic treatment of nitrosation-anaerobic ammonia oxidation is realized, and the aim of high-efficiency denitrification is fulfilled.
2. The traditional activated sludge treatment process requires adding organic carbon to react with nitrogen oxides in sewage to remove nitrogen, and the nitrosation anaerobic ammoxidation reaction does not need adding the organic carbon, so that nitrogen can be removed under the condition of insufficient organic carbon because the nitrosation reaction is carried out to convert ammonia nitride into nitrite nitrogen, and the problem that the nitrogen removal effect is poor due to imbalance of carbon-nitrogen ratio easily occurs in the traditional activated sludge treatment process is solved.
Step four: the sewage after the nitrosation anaerobic ammoxidation reaction flows into a second aerobic tank 4, and a second suspension filler and sludge are arranged in the second aerobic tank 4, wherein the sludge contains aerobic bacteria; the sewage stays in the second aerobic tank 4 for 1-2h. The second suspension filler is one or more of sponge filler and high-density polyethylene filler. The aerobic bacteria are attached to the second suspension filler, and convert the residual nitrogen oxides and phosphorus in the sewage into nitrogen and biological sludge, so as to achieve the purpose of deep purification.
In the fourth step, in order to improve the denitrification effect of the overall process and avoid excessive accumulation of nitrite, a nitrifying liquid reflux device 8 for refluxing part of nitrifying liquid generated by the second aerobic reaction to the anaerobic tank 1 is arranged at the outlet of the second aerobic tank 4.
The nitrified liquid reflux device 8 includes a first reflux pipe 81, a reflux pump 82, and a second reflux pipe 83; the input end of the first return pipe 81 is communicated with the outlet of the second aerobic tank 4, one end of the return pump 82 is connected with the output end of the first return pipe 81, the other end of the return pump 82 is connected with the input end of the second return pipe 83, and the output end of the second return pipe 83 is communicated with the anaerobic tank 1. The nitrifying liquid is refluxed to the inside of the anaerobic tank 1 through the nitrifying liquid reflux device 8, so that a certain suspended matter concentration and a microorganism concentration are provided for anaerobic reaction, the whole biochemical reaction can be improved, and the energy consumption can be saved.
Step five: and (3) performing flocculation precipitation reaction, wherein sewage after secondary aerobic reaction flows into the sedimentation tank 5, sludge is compressed to the bottom 312 part of the sedimentation tank 5 through flocculation reaction and gravity sedimentation, and clear water flows out from the upper part of the sedimentation tank 5, so that sewage purification is completed.
The sedimentation tank 55 comprises a guide cylinder 51 and an overflow weir 52 which are arranged in the sedimentation tank 55, wherein the guide cylinder 51 is communicated with the overflow pipe 6, and the overflow weir 52 is fixedly arranged at the middle-upper position in the sedimentation tank 55; the bottom of the sedimentation tank 55 is funnel-shaped. The funnel-shaped design can enable the sludge to compress deposited sludge by utilizing self gravity, so that the sludge amount is reduced. The guide cylinder 51 guides the mud-water mixture to the middle lower part of the sedimentation tank 55, and performs mud-water separation by utilizing the density difference of sewage and sludge; the overflow weir 52 is a structure for overflowing the liquid on the sedimentation tank 55, has the functions of maintaining the liquid layer on the plate and uniformly overflowing the liquid, and can intercept part of floating particles so as to improve the mud-water separation effect.
In the fifth step, in order to further improve the denitrification effect, a sludge recirculation device 9 for recirculating part of the sludge to the anaerobic tank 1 is further disposed at the outlet of the sedimentation tank 5. The sludge recirculation device 9 comprises a first sludge discharge pipe 91, a sludge pump 92, a third recirculation pipe 93 and a second sludge discharge pipe 94; the first sludge discharge pipe 91 extends from the bottom of the sedimentation tank 55 to the outside and is connected to the sludge pump 92, one end of the third return pipe 93 is connected to the sludge pump 92, the other end is connected to the anaerobic tank 11, and the second sludge discharge pipe 94 is connected to the sludge pump 92. The sludge is returned to the inside of the anaerobic tank 11 through the sludge return device 9, so that a certain suspended matter concentration and microorganism concentration are provided for anaerobic reaction, the whole biochemical reaction can be improved, and the energy consumption can be saved.
100 cubes of sewage are treated by the low-carbon sewage treatment process and the traditional activated sludge method respectively, and various indexes of the treatment process are observed and measured.
Example 1
A high-efficiency denitrification low-carbon sewage treatment process comprises the following steps: step one: anaerobic reaction, arranging combined filler and sludge in an anaerobic tank 1.5, introducing sewage, introducing 100 cubes of sewage, and staying the sewage in the anaerobic tank for 2 hours; the sludge contains hydrolytic bacteria, acidifying bacteria, methanogenic bacteria and phosphorus accumulating bacteria.
Step two: and (3) performing primary aerobic reaction, wherein sewage subjected to anaerobic reaction flows into a first aerobic tank 2, a first suspension filler and sludge containing aerobic microorganisms are arranged in the first aerobic tank 2, and the sewage stays in the first aerobic tank for 3 hours.
Step three: the nitrosation-anaerobic ammonia oxidation reaction is carried out, sewage after primary aerobic reaction flows into the nitrosation coupling anaerobic ammonia oxidation tank 3, and the sewage stays in the nitrosation coupling anaerobic ammonia oxidation tank 3 for 8 hours.
Step four: and (3) performing secondary aerobic reaction, wherein sewage subjected to nitrosation-anaerobic ammoxidation reaction flows into a second aerobic tank 4, a second suspension filler and sludge containing aerobic bacteria are arranged in the second aerobic tank 4, and the sewage stays in the second aerobic tank for 1h.
Step five: flocculation precipitation reaction, sewage after secondary aerobic reaction flows into a sedimentation tank 5, sludge is compressed to the bottom of the sedimentation tank through flocculation reaction and gravity sedimentation, and clear water flows from the upper part of the sedimentation tankAnd (5) discharging to finish sewage purification. Finally, detecting oxygen consumption, alkalinity consumption, organic carbon consumption and CO in the sewage treatment process 2 A released amount, and a dry sludge produced amount.
Example two
A high-efficiency denitrification low-carbon sewage treatment process comprises the following steps:
step one: anaerobic reaction, arranging combined filler and sludge in an anaerobic tank 1, introducing 100 cubes of sewage, and staying the sewage in the anaerobic tank for 2.5 hours; the sludge contains hydrolytic bacteria, acidifying bacteria, methanogenic bacteria and phosphorus accumulating bacteria.
Step two: and (3) performing primary aerobic reaction, wherein sewage after anaerobic reaction flows into a first aerobic tank 2, a first suspension filler and sludge containing aerobic microorganisms are arranged in the first aerobic tank, and the sewage stays in the first aerobic tank for 4 hours.
Step three: the nitrosation-anaerobic ammonia oxidation reaction is carried out, sewage after primary aerobic reaction flows into the nitrosation coupling anaerobic ammonia oxidation tank 3, and sewage circulates in the nitrosation coupling anaerobic ammonia oxidation tank for 9 hours.
Step four: and (3) performing secondary aerobic reaction, wherein sewage subjected to nitrosation-anaerobic ammoxidation reaction flows into a second aerobic tank 4, a second suspension filler and sludge containing aerobic bacteria are arranged in the second aerobic tank 4, and the sewage stays in the second aerobic tank for 1.5h.
Step five: and (3) performing flocculation precipitation reaction, wherein sewage after secondary aerobic reaction flows into a sedimentation tank 5, sludge is compressed to the bottom of the sedimentation tank through flocculation reaction and gravity sedimentation, and clear water flows out from the upper part of the sedimentation tank, so that sewage purification is completed. Finally, detecting oxygen consumption, alkalinity consumption, organic carbon consumption and CO in the sewage treatment process 2 A released amount, and a dry sludge produced amount.
Example III
A high-efficiency denitrification low-carbon sewage treatment process comprises the following steps: step one: anaerobic reaction, arranging combined filler and sludge in an anaerobic tank 1, introducing sewage, introducing 100 cubes of sewage, and staying the sewage in the anaerobic tank for 3.5 hours; the sludge contains hydrolytic bacteria, acidifying bacteria, methanogenic bacteria and phosphorus accumulating bacteria.
Step two: and (3) performing primary aerobic reaction, wherein sewage subjected to anaerobic reaction flows into a first aerobic tank 2, a first suspension filler and sludge containing aerobic microorganisms are arranged in the first aerobic tank 2, and the sewage stays in the first aerobic tank for 5 hours.
Step three: the nitrosation-anaerobic ammonia oxidation reaction is carried out, sewage after primary aerobic reaction flows into the nitrosation coupling anaerobic ammonia oxidation tank 3, and the sewage stays in the nitrosation coupling anaerobic ammonia oxidation tank 3 for 10 hours.
Step four: and (3) performing secondary aerobic reaction, wherein sewage subjected to nitrosation-anaerobic ammoxidation reaction flows into a second aerobic tank 4, a second suspension filler and sludge containing aerobic bacteria are arranged in the second aerobic tank 4, and the sewage stays in the second aerobic tank for 2 hours.
Step five: and (3) performing flocculation precipitation reaction, wherein sewage after secondary aerobic reaction flows into a sedimentation tank 5, sludge is compressed to the bottom of the sedimentation tank through flocculation reaction and gravity sedimentation, and clear water flows out from the upper part of the sedimentation tank, so that sewage purification is completed. Finally, detecting oxygen consumption, alkalinity consumption, organic carbon consumption and CO in the sewage treatment process 2 A released amount, and a dry sludge produced amount.
Comparative example one
100 cubes of sewage were treated using a conventional activated sludge process:
step one: introducing 100 cubes of sewage into an anaerobic tank, wherein the residence time is 6 hours;
step two: the aerobic reaction is carried out for 6 hours, an organic carbon source is added in real time according to the reaction, and finally, part of the effluent of the aerobic reaction flows back to the anaerobic tank;
step three: and (3) discharging water from the aerobic reaction to a sedimentation tank, wherein the retention time is 8h, and part of sludge at the bottom of the sedimentation tank flows back to the anaerobic tank and the other part is discharged.
Step four: and discharging water from the sedimentation tank to a clean water tank. Finally, detecting oxygen consumption, alkalinity consumption, organic carbon consumption and CO in the sewage treatment process 2 A released amount, and a dry sludge produced amount.
Oxygen consumption during wastewater treatment of three examples and one comparative example was measuredAlkalinity consumption, organic carbon consumption, CO 2 The amount released and the amount of dry sludge produced were compared as follows:
table 1 comparison of experimental data for three examples and one comparative example
In Table 1, the organic carbon consumption amounts 39 to 51kg in examples one to three refer to the organic carbon content of 100 cubic waste water itself, and the organic carbon consumption amount 104kg in comparative example one refers to the sum of the organic carbon content of 100 cubic waste water itself and the additional organic carbon added. It can be seen that: the low-carbon sewage treatment process disclosed by the invention not only saves organic carbon, but also greatly reduces the oxygen consumption and the alkalinity consumption, and simultaneously reduces the generation of 60% of dry sludge; in addition, compared with the traditional activated sludge method, the method can reduce the release amount of carbon dioxide by about 30%, and realize the comprehensive purposes of energy conservation, emission reduction and consumption reduction.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (10)
1. A high-efficiency denitrification low-carbon sewage treatment process is characterized in that: the method comprises the following steps:
step one: anaerobic reaction, arranging combined filler and sludge in an anaerobic tank, introducing sewage, and staying the sewage in the anaerobic tank for 1.5-3.5h; the sludge contains hydrolytic bacteria, acidifying bacteria, methanogens and phosphorus accumulating bacteria;
step two: the sewage after the primary aerobic reaction flows into a first aerobic tank, a first suspension filler and sludge are arranged in the first aerobic tank, and the sewage stays in the first aerobic tank for 3-5h;
step three: the nitrosation-anaerobic ammonia oxidation reaction is carried out, sewage after primary aerobic reaction flows into a nitrosation coupling anaerobic ammonia oxidation tank, and the sewage stays in the nitrosation coupling anaerobic ammonia oxidation tank for 8-10h; the nitrosation coupling anaerobic ammonia oxidation tank comprises a nitrosation tank and an anaerobic ammonia oxidation tank, wherein fixed filler and sludge are arranged in the nitrosation tank, and anaerobic flexible filler and sludge are arranged in the anaerobic ammonia oxidation tank; the anaerobic ammonia oxidation tank is positioned in the nitrosation tank and above the bottom of the nitrosation tank, and the sewage forms a flowing circulation channel between the nitrosation tank and the anaerobic ammonia oxidation tank;
step four: the sewage after the nitrosation anaerobic ammoxidation reaction flows into a second aerobic tank, a second suspension filler and sludge are arranged in the second aerobic tank, and the sewage stays in the second aerobic tank for 1-2h;
step five: and (3) performing flocculation precipitation reaction, wherein sewage after secondary aerobic reaction flows into a sedimentation tank, sludge is compressed to the bottom of the sedimentation tank through flocculation reaction and gravity sedimentation, and clear water flows out from the upper part of the sedimentation tank, so that sewage purification is completed.
2. The process for treating high-efficiency denitrification low-carbon sewage according to claim 1, wherein: in the first step, the combined filler is one or more of woven belts, plastic fibers, plastic threads and fiber bundles.
3. The process for treating high-efficiency denitrification low-carbon sewage according to claim 1, wherein: in the second step, the first suspension filler is one or more of sponge filler and high-density polyethylene filler.
4. The process for treating high-efficiency denitrification low-carbon sewage according to claim 1, wherein: in the third step, the fixed filler is one or more of porous rod-shaped filler, semi-flexible filler, combined filler and braided curtain filler; the anaerobic flexible filler is suspended filler, and one or more of the anaerobic flexible filler sponge filler and the high-density polyethylene filler.
5. The process for treating high-efficiency denitrification low-carbon sewage according to claim 1, wherein: the nitrosation pond comprises a top wall, a pond bottom, a first side wall, a second side wall, a third side wall, a fourth side wall and a partition plate; one end of the partition board is fixedly connected with the first side wall, the other end of the partition board is fixedly connected with the third side wall, a gap is formed between the top surface of the partition board and the top wall, and a gap is formed between the top surface of the partition board and the bottom of the pool; the anaerobic ammonia oxidation tank is formed between the partition plate and the second side wall;
the anaerobic ammonia oxidation tank further comprises an upper grid mesh and a lower grid mesh which are fixedly connected between the partition plate and the second side wall.
6. The process for treating high-efficiency denitrification low-carbon sewage according to claim 5, wherein: the upper grid net and the lower grid net are provided with through holes for sewage to pass through, and the aperture of the through holes is smaller than the particle size of the anaerobic flexible filler.
7. The process for treating high-efficiency denitrification low-carbon sewage according to claim 1, wherein: in the fourth step, the second suspension filler is one or more of sponge filler and high-density polyethylene filler.
8. The process for treating high-efficiency denitrification low-carbon sewage according to claim 7, wherein: and a nitrifying liquid reflux device for refluxing part of nitrifying liquid generated by the second aerobic reaction to the anaerobic tank is arranged at the outlet of the second aerobic tank.
9. The process for treating high-efficiency denitrification low-carbon sewage according to claim 1, wherein: in the fifth step, a sludge reflux device for refluxing part of sludge to the inside of the anaerobic tank is further arranged at the outlet of the sedimentation tank.
10. The process for treating high-efficiency denitrification low-carbon sewage according to claim 1, wherein: the anaerobic tank, the first aerobic tank, the nitrosation coupling anaerobic ammonia oxidation tank, the second aerobic tank and the sedimentation tank are communicated through overflow pipes.
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