CN107601671B - Non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system and method - Google Patents
Non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system and method Download PDFInfo
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- CN107601671B CN107601671B CN201711104911.9A CN201711104911A CN107601671B CN 107601671 B CN107601671 B CN 107601671B CN 201711104911 A CN201711104911 A CN 201711104911A CN 107601671 B CN107601671 B CN 107601671B
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 36
- 238000005273 aeration Methods 0.000 title claims abstract description 32
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
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- 239000002351 wastewater Substances 0.000 claims abstract description 37
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 16
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 16
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims abstract description 15
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 230000005484 gravity Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 30
- 238000009423 ventilation Methods 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000013305 flexible fiber Substances 0.000 claims description 3
- 239000002808 molecular sieve Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 239000012466 permeate Substances 0.000 abstract description 4
- 238000012856 packing Methods 0.000 description 26
- 230000001580 bacterial effect Effects 0.000 description 13
- 238000005265 energy consumption Methods 0.000 description 5
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 4
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000193830 Bacillus <bacterium> Species 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
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- 241000108664 Nitrobacteria Species 0.000 description 1
- 241000605122 Nitrosomonas Species 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention relates to a non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system and a treatment method. Porous filler is paved on the surface of the filler bracket, and microbial films consisting of an outer layer nitrifying bacteria microbial film and an inner layer denitrifying bacteria microbial film are attached to the surface of the porous filler. According to the invention, the nitrification reaction and the denitrification reaction are integrated into a treatment system, wastewater permeates into the porous filler under the combined action of gravity and a capillary structure of the porous filler, is contacted with an outer nitrifying bacteria microbial membrane and converts ammonia nitrogen in the wastewater into nitrate and nitrite in an aerobic environment, is contacted with an inner denitrifying bacteria microbial membrane and converts the nitrate and nitrite in the wastewater into nitrogen in an anaerobic environment, and escapes from the water, so that the denitrification of the wastewater is realized.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment system and method for non-aeration synchronous nitrification and denitrification.
Background
Along with the rapid development of industrialization in China and the continuous expansion of urban scale, a large amount of nitrogen-containing compounds discharged each year become one of important pollutants in the water body environment, and a large amount of nitrogen compounds enter the water body environment to cause the deterioration of the water body quality, influence the quality of fishery, agriculture and town environment and further influence the health of human bodies.
At present, biological treatment is used as a main technology of a wastewater treatment plant for treating nitrogen-containing wastewater, and the technical process mainly comprises a serial connection of an aerobic bioreactor in a nitrification stage and an anaerobic bioreactor in a denitrification stage. The aerobic and anaerobic serial processes can achieve better denitrification effect, but have some defects, and are mainly characterized by complex system and large occupied area; the nitrification stage needs aeration, generates larger energy consumption, and is inconvenient to operate and manage. The nitrifying reaction mainly means that organic matters in water are oxidized into carbon dioxide under the action of microorganisms under the condition of oxygen supply, and ammonia in water is subjected to nitrifying reaction under the action of microorganisms to generate nitrate or nitrite. Denitrification refers to the conversion of nitrate or nitrite to nitrogen gas that escapes from water in an oxygen-free or oxygen-less environment.
Currently, there is a synchronous nitrification and denitrification reactor technology combining an aerobic nitrification reaction process and a denitrification reaction process, for example, a patent with publication number of CN 106554129A, and this patent application proposes an integrated sewage treatment device, which creates aerobic conditions by means of porous or microporous aeration, and can effectively treat nitrogen-containing wastewater. However, the system has the problems that the denitrification rate is slow, an external aeration fan is required, and a large amount of energy consumption is generated, and the uniformity of the microbial film contacted with oxygen is difficult to control in the aeration process, so that the efficiency and stability of wastewater treatment are difficult to ensure, and the treatment capacity of high-concentration nitrogen-containing wastewater is limited.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system which has the characteristics of high denitrification rate, small occupied area, no need of aeration, energy consumption saving, simple operation in the membrane forming process, high wastewater treatment efficiency, convenient operation and management and the like.
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
a non-aeration baffled synchronous nitrification and denitrification wastewater treatment system, comprising:
the vertical box body is internally provided with a cavity, and the liquid inlet hole, the liquid outlet hole and the cavity are communicated;
a filler bracket is arranged in the cavity, so that a baffling water flow channel from top to bottom is formed in the cavity;
porous filler is laid on the surface of the filler bracket, and microbial films are attached to the surface of the porous filler, wherein each microbial film comprises an outer nitrifying bacterial microbial film and an inner denitrifying bacterial microbial film.
In a possible embodiment of the invention, the packing support is a zigzag or S-shaped support or a "<" shaped support, and the packing support is detachably mounted in the vertical box body.
Preferably, the packing support comprises 2 layers or more than 2 layers, each layer is a frame structure formed by a frame and an opening positioned in the middle of the frame, or each layer is a grid plate structure. In addition, any structure which can be used for placing the flexible fiber filler and allowing water to permeate through can be adopted.
In a possible embodiment of the invention, the upper end of the vertical box body is provided with a water distribution table, the liquid inlet is connected with the water distribution table, the water distribution table extends out of a water distribution plate, and a plurality of water distribution holes are distributed on the water distribution plate.
In a possible embodiment of the invention, the water distribution table is provided with a sampling groove for sampling detection.
In a possible embodiment of the invention, the vertical tank is provided with at least one vent opening communicating with the outside, facilitating the supply of oxygen and the evacuation of nitrogen.
In a possible embodiment of the present invention, the number of the ventilation openings is set in pairs, and each pair of ventilation openings is set in opposite directions, so that air convection is formed in the cavity of the vertical box body.
In a possible embodiment of the invention, the porous filler is a flexible fibrous filler, a molecular sieve or a porous ceramic plate, preferably a flexible fibrous filler.
In a possible embodiment of the present invention, the vertical tank is formed by stacking and combining a first tank and a second tank in a height direction, the first tank is disposed at an upper portion, the second tank is disposed at a lower portion, a cavity of the first tank is communicated with a cavity of the second tank, the upper end of the first tank is provided with the liquid inlet hole, and the lower end of the second tank is provided with the liquid outlet hole; the first box body and the second box body are detachably combined together.
In a possible embodiment of the invention, the packing support comprises a first packing support provided to the first tank and a second packing support provided to the second tank.
In a possible embodiment of the invention, the first housing is provided with a pair of said ventilation openings and the second housing is provided with a pair of said ventilation openings.
In one possible embodiment of the invention, the vertical box body is formed by overlapping and combining three or more than three small box bodies in the height direction, the cavities of the small box bodies are mutually communicated, the liquid inlet hole is arranged at the upper end of the small box body positioned at the uppermost part, the liquid outlet hole is arranged at the lower end of the small box body positioned at the lowermost part, and the small box bodies are detachably combined together.
The invention also provides a non-aeration baffling type synchronous nitrification and denitrification wastewater treatment method, and the non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system of any one of the embodiments is used.
In a possible embodiment of the invention, the processing method comprises the following steps:
1) Introducing N-containing wastewater into the vertical box body from the liquid inlet hole, flowing along the baffling type water flow channel, contacting with microbial membranes on the porous filler in the flowing process, and penetrating into the porous filler under the action of gravity and capillary action of the porous filler;
2) In the infiltration process, the wastewater is contacted with an outer nitrifying bacteria microbial membrane, and ammonia nitrogen in the wastewater is converted into nitrate and nitrite in an aerobic environment;
3) Then, nitrate and nitrite in the wastewater are contacted with the denitrifying bacteria microbial membrane at the inner layer, and under the anaerobic environment, the nitrate and the nitrite are converted into nitrogen, and overflow from the water, so that the denitrification of the wastewater is realized.
In the method described above, preferably, in the step 2), the nitrifying bacterial microbial film on the outer layer is connected to the external environment through the ventilation opening, so as to provide an oxygen source for the nitrifying bacterial microbial film and help the nitrogen generated by the denitrifying bacterial microbial film escape rapidly.
The method as described above, wherein the denitrifying bacterium is a bacterium capable of causing denitrification, such as denitrifying bacillus, stonia, fimbriae bacillus, etc.; the nitrifying bacteria include nitrite (nitrosomonas) and nitrate (nitrobacteria), and oxygen is used as a final electron acceptor in the oxidation process.
The beneficial effects of the invention are as follows:
(1) According to the non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system, the nitrification reaction and the denitrification reaction are integrated into one treatment system, wastewater continuously permeates into the porous filler under the combined action of the gravity action and the porous filler capillary structure, firstly contacts with an outer nitrifying bacteria microbial membrane and converts ammonia nitrogen in the wastewater into nitrate and nitrite in an aerobic environment, then contacts with an inner denitrifying bacteria microbial membrane and converts nitrate and nitrite in the wastewater into nitrogen in an anaerobic environment, and escapes from the water, so that wastewater denitrification is realized.
(2) According to the invention, the vertical box body is arranged, the baffling type water flow channel is formed in the vertical box body, the running path of the wastewater and the moving time of submitting the wastewater per unit are prolonged, the expansion and thinning treatment of the wastewater is realized, the contact area of a microbial film and the wastewater is enlarged, the denitrification rate is improved, and the treatment efficiency and the stability of the system are improved, so that the system has very strong treatment capacity on high-concentration nitrogenous wastewater.
(3) The porous filler and the microbial membrane are arranged in the top-down baffling water flow channel and are bent and circuitously extended in the vertical direction, so that the occupied area of a treatment system is greatly reduced, the treatment speed and the treatment effect of the nitrogenous wastewater are improved, and the reduction of the investment and the operation cost of the equipment in the earlier stage is facilitated.
(4) After wastewater enters the cavity of the vertical box body from the liquid inlet hole, the flow of water flows automatically under the action of gravity, and external pressurization is not needed; the nitrifying bacteria biological film on the outer layer can have a large surface area to contact with the wastewater, and a sufficient aerobic environment is provided through the ventilation opening, so that an aeration device is omitted, and the system hardware cost and the operation energy consumption cost are saved. And as no aeration process is adopted, the microbial film on the surface of the porous filler is not affected by aeration stirring and becomes uneven, and the uniformity of contact of the microbial film with oxygen is improved.
Drawings
Fig. 1 is a schematic diagram of a wastewater treatment system according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of the porous filler and microbial membrane structure according to the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a filler holder of a wastewater treatment system according to a first embodiment of the present invention.
[ reference numerals description ]
100 wastewater treatment systems; 10 vertical box bodies; 101 a first box; 102 a second box;
111 liquid inlet holes; 121 liquid outlet holes; a first bracket 21; 22 a second bracket; p1 and P2 baffled water flow channels; 110 water distribution table; 113 water distribution plates; 114 water distribution holes; 1101 sampling slot;
30 porous filler; 40 microbial film; 41 nitrifying bacterial microbial films; 42 denitrifying bacterial microbial films 41; waste water 80;81 an attached aqueous layer; 82 flow the aqueous layer.
Detailed Description
The invention will be better explained by the following detailed description of the embodiments with reference to the drawings.
Example 1
As shown in fig. 1, a non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system 100 for implementing the invention comprises a vertical tank body 10 formed by stacking and combining a first tank body 101 and a second tank body 102 in the height direction, wherein the upper end of the vertical tank body 10 is provided with a liquid inlet 111, and the lower end of the vertical tank body is provided with a liquid outlet 121. Specifically, the liquid inlet 111 is disposed at the upper end of the first casing 101, and the liquid outlet 121 is disposed at the lower end of the second casing 102. The first case 101 and the second case 102 are detachably combined together to form the vertical case 10. The first case 101 and the second case 102 are hollow inside and are communicated with each other. The first packing support 21 and the second packing support 22 are respectively arranged in the cavities of the first box body 101 and the second box body 102, the cavity in the first box body 101 forms a baffled water flow channel P1 from top to bottom due to the arrangement of the first packing support 21, the cavity in the second box body 102 forms a baffled water flow channel P2 from top to bottom due to the arrangement of the second packing support 22, and the P1 is communicated with the P2. In addition, a water distribution table 110 is further arranged at the upper part of the first box body 101, the liquid inlet hole 111 is connected with the water distribution table 110, and after the wastewater to be treated is led in from the liquid inlet hole 111, the wastewater reaches the water distribution table 110 first, and the water distribution table 110 is in a container shape and can temporarily store some water. The water distribution table 110 extends out of a water distribution plate 113, on which a plurality of water distribution holes 114 are distributed. After the temporary stored water quantity of the water distribution table 110 exceeds a critical value, the water overflows onto the water distribution plate 113, is uniformly distributed through water distribution holes 114 on the water distribution plate 113, and then enters the baffled water flow channels P1 and P2. The water distribution table 110 is also provided with a sampling tank 1101, and the sampling tank 1101 can provide sampling detection.
As shown in fig. 3, a specific structural schematic diagram of the first packing support 21 and the second packing support 22 according to an embodiment of the present invention is a zigzag support. Each of the brackets has 2 or more layers (4 layers are shown in fig. 3), and each layer is a frame structure composed of a frame and an opening in the middle of the frame, and the frame is used for supporting the porous filler 30 (such as a flexible fiber layer with a certain thickness). In other embodiments, each layer of the zig-zag stent may be provided as a grid plate structure for supporting the porous filler 30. The structure of the packing support is not limited to the foregoing form as long as it can support the flexible fibrous porous packing. In other embodiments, the first and second filler brackets 21, 22 are S-shaped or "<" shaped brackets, and as with the previously described zig-zag brackets, each layer is a frame structure or grid plate structure consisting of a rim and openings. It will be appreciated that the specific structure of the first packing support 21 and the second packing support 22 is not limited in the present invention, as long as a baffled water flow channel extending from top to bottom can be formed. Wherein the first packing support 21 and the second packing support 22 are detachably installed in the first case 101 and the second case 102, respectively, so as to facilitate replacement of the packing support and the porous packing 30 and the microbial film 40 laid thereon.
As shown in fig. 2, porous fillers 30 are laid on the surfaces of the first filler holder 21 and the second filler holder 22, and microbial films 40 are attached to the surfaces of the porous fillers 30, and the microbial films 40 include an outer nitrifying bacterial microbial film 41 and an inner denitrifying bacterial microbial film 42. The porous filler 30 is a flexible fibrous filler, a porous filler with capillary or microporous structure such as a molecular sieve or a porous ceramic plate, and is preferably a flexible fibrous filler such as polyurethane fibrous material. On the one hand, the micropores or capillary holes can be used for attaching microbial films and avoiding being washed away by water flow, on the other hand, the water flow can be guided to permeate downwards under the action of gravity due to the characteristics of water retention, water absorption and the like, so that wastewater sequentially contacts the outer nitrifying bacteria biological film 41 and the inner denitrifying bacteria biological film 42, and finally the water subjected to nitrogen removal treatment is collected below the porous filler 30 and oozes.
In this embodiment, at least one ventilation opening (not shown) is provided in the vertical casing 10, and preferably ventilation openings are provided in the front and rear side walls of the drawing plane shown in fig. 1. Specifically, the first casing 101 may be provided only, the second casing 102 may be provided only, or both casings may be provided with ventilation openings. The vent is used for being communicated with the outside and is convenient for providing oxygen and exhausting nitrogen. More preferably, the ventilation openings are arranged in pairs, and each pair of ventilation openings are arranged in opposite directions, so that air convection is formed in the cavity of the vertical box body. In order to exert the best effect of the present invention, the side walls of the first tank 101 and the second tank 102 are respectively provided with two ventilation openings, oxygen is gradually consumed by the microbial film 40 on the porous filler 30 from outside to inside, and the dissolved oxygen concentration changes in a gradient manner, so that the requirements of the nitrifying bacteria biological film 41 and the denitrifying bacteria biological film 42 on different dissolved oxygen concentrations are ensured.
The preparation process of the microbial film 40 on the porous filler 30 of the wastewater treatment system 100 of this embodiment adopts a two-stage film forming method of the filler biofilm, and the method is as follows:
firstly, placing a filler into a prepared plastic bucket, adding nitrifying bacteria for initial film formation (nitrifying bacteria can be purchased or gradually domesticated by activated sludge from a secondary sedimentation tank), after observing that a biological film with a certain thickness is attached on the filler, placing the filler into a reactor, connecting a wastewater treatment system 100 into a water inlet reflux mode, introducing water from a liquid inlet hole 111, keeping the ammonia nitrogen concentration in the water at 60mg/L, adding sodium bicarbonate and dipotassium hydrogen phosphate according to the ratio of C: N=35:5:1, flushing the porous filler 30 by circulating water, then starting continuous water inlet, setting the hydraulic retention time to 24h, adding sodium bicarbonate, ammonium sulfate and dipotassium hydrogen phosphate according to the ratio, domesticating microorganisms on a microbial film 40 again, gradually lifting the ammonia nitrogen concentration gradient of the water from 30mg/L, 60mg/L, 80mg/L to 100mg/L, detecting the ammonia nitrogen concentration of the water, and obtaining the ammonia nitrogen concentration of the water after the ammonia nitrogen concentration of the water reaches 100mg/L, and obtaining a stable ammonia nitrogen concentration of 90% after the detected ammonia nitrogen removal, and obtaining a stable film formation rate of 41. Then, a second stage of denitrifying bacteria film forming is carried out, namely denitrifying bacteria (the denitrifying bacteria can be purchased or gradually domesticated by activated sludge from a secondary sedimentation tank) are added into the inflow water, sodium nitrate and a small amount of glucose (used as an organic carbon source) are added into the inflow water to domesticate the biological film, the nitrate nitrogen concentration gradient of the inflow water is gradually increased from 30mg/L, 60mg/L and 80mg/L to 100mg/L, the nitrate nitrogen concentration of the inflow water is detected, and when the nitrate nitrogen concentration of the inflow water reaches 100mg/L and the detected nitrate nitrogen removal rate of the outflow water is stabilized at 90%, the success of the denitrifying bacteria film forming 42 is indicated. Thus, the microbial film 40 is prepared. The Dissolved Oxygen (DO) concentration in the microbial film 40 gradually decreases from the outside to the inside. As shown in fig. 2, the microbial film 40 is composed of an outer aerobic nitrifying bacteria biofilm 41 and an inner anaerobic denitrifying bacteria biofilm 42.
The invention also relates to a non-aeration baffling type synchronous nitrification and denitrification wastewater treatment method, which is shown in fig. 2, namely, the wastewater treatment system 100 is applied, and specifically comprises the following steps:
1) Introducing the N-containing wastewater 80 into the vertical box 10 from the liquid inlet hole 111, flowing along the baffled water flow channels P1 and P2, and contacting an attached water layer 81 with the microbial membrane 40 on the porous filler 30 in the flowing process and penetrating to the lower side of the porous filler 30 under the action of gravity and capillary action of the porous filler 30;
2) In the permeation process, the attached water layer 81 is contacted with the nitrifying bacteria microbial membrane 41 on the outer layer, and ammonia nitrogen in the wastewater is converted into nitrate and nitrite in an aerobic environment;
3) Then, the nitrate and nitrite in the attached water layer 81 are brought into contact with the denitrifying bacterial microbial film 42 of the inner layer, and under anaerobic conditions, the nitrate and nitrite are converted into nitrogen gas, overflowed from the water to thereby effect denitrification of the wastewater.
The flowing water layer 82 flows along the water flow channels P1, P2 to the surface of the microbial film 40 at the next position, and the same reaction process as the aforementioned (2) - (3) occurs.
Finally, the treated water is discharged through the liquid outlet 121. Based on the water quality measurement, it is determined whether to repeat the processes of (1) - (3) again.
Preferably, in the step 2), the nitrifying bacterial microbial film 41 on the outer layer is connected to the external environment through the ventilation opening, so as to provide a necessary oxygen source for the nitrifying bacterial microbial film 41 and help the nitrogen generated by the denitrifying bacterial microbial film 42 escape rapidly.
Implement two
The non-aeration, baffled, synchronous nitrification and denitrification wastewater treatment system 100 of this embodiment differs from that of the first embodiment only in that the first tank 101 and the second tank 102 are replaced by a single vertical tank. In other words, the first casing 101 and the second casing 102 are manufactured as one body, and the first packing support 21 and the second packing support 22 are connected as one packing support. The wastewater treatment system 100 of this embodiment is the same as that of the first embodiment in terms of film formation preparation and application, and will not be described again here.
Implementation three
The non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system 100 of the present embodiment is different from the first embodiment only in that the first tank 101 and the second tank 102 are divided into a plurality of small tanks stacked in the height direction, the cavities of the small tanks are mutually communicated, the liquid inlet 111 is arranged at the upper end of the small tank positioned at the uppermost part, the liquid outlet 121 is arranged at the lower end of the small tank positioned at the lowermost part, and the small tanks are detachably combined together. Wherein, the lateral wall of each little box is equipped with at least one vent or the lateral wall of at least one little box in a plurality of little boxes is equipped with the vent. And wherein the first packing support 21 and the second packing support 22 are split into several small packing supports. The wastewater treatment system 100 of this embodiment is the same as that of the first embodiment in terms of film formation preparation and application, and will not be described again here.
Compared with the existing synchronous nitrification and denitrification reactor, the non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system 100 of the invention utilizes oxygen in the air through reasonable arrangement of microbial film structures and space application on the surface of the porous filler 40 and through ventilation openings on the side wall of the vertical box body 10, which are communicated with the external environment, thereby avoiding the problem of huge energy consumption caused by the prior aeration mode for obtaining the oxygen. The invention also improves the uniformity of the contact of the microbial film 40 with oxygen, has good treatment efficiency on high-concentration nitrogen-containing wastewater, and ensures the quality of wastewater treatment.
Claims (8)
1. A non-aeration baffled synchronous nitrification and denitrification wastewater treatment system, comprising:
the vertical box body is internally provided with a cavity, and the liquid inlet hole and the liquid outlet hole are communicated with the cavity;
a filler bracket is arranged in the cavity, so that a baffling water flow channel from top to bottom is formed in the cavity;
the surface of the filler bracket is paved with porous filler, the surface of the porous filler is attached with a microbial film, and the microbial film comprises an outer nitrifying bacteria microbial film and an inner denitrifying bacteria microbial film; the filler support is a Z-shaped or S-shaped support or a "<" shaped support, and is detachably arranged in the vertical box body; the porous filler is flexible fiber filler, molecular sieve or porous ceramic plate; each support is provided with 2 layers or more than 2 layers, each layer is a frame structure formed by a frame and an opening positioned in the middle of the frame, and the frame is used for supporting the porous filler; or each layer of the Z-shaped filler support is provided with a grid plate structure, and the grid plate is used for supporting the porous filler;
the vertical box body is formed by overlapping and combining a first box body and a second box body in the height direction, the first box body is arranged on the upper part, the second box body is arranged on the lower part, a cavity of the first box body is communicated with a cavity of the second box body, the upper end of the first box body is provided with the liquid inlet hole, and the lower end of the second box body is provided with the liquid outlet hole; the first box body and the second box body are detachably combined together; or alternatively
The vertical box body is formed by overlapping and combining three or more small box bodies in the height direction, the cavities of the small box bodies are mutually communicated, the upper end of the small box body positioned at the uppermost part is provided with the liquid inlet hole, the lower end of the small box body positioned at the lowermost part is provided with the liquid outlet hole, and the small box bodies are detachably combined together;
the vertical box body is provided with at least one ventilation opening which is communicated with the outside and is convenient for providing oxygen and exhausting nitrogen; the number of the ventilation openings is set in pairs, and each pair of ventilation openings is set in opposite directions, so that air convection is formed in the cavity of the vertical box body.
2. The non-aeration baffling type synchronous nitrification and denitrification wastewater treatment system according to claim 1, wherein a water distribution table is arranged at the upper end of the vertical box body, the liquid inlet holes are connected with the water distribution table, the water distribution table extends out of a water distribution plate, and a plurality of water distribution holes are distributed on the water distribution plate.
3. The non-aeration baffled synchronous nitrification and denitrification wastewater treatment system as claimed in claim 2, wherein the water distribution table is provided with a sampling tank.
4. The non-aeration baffled synchronous nitrification and denitrification wastewater treatment system as claimed in claim 1, wherein said filler support comprises a first filler support provided in said first tank and a second filler support provided in said second tank.
5. The non-aeration baffled synchronous nitrification and denitrification wastewater treatment system as set forth in claim 4, wherein said first tank is provided with a pair of said ventilation openings and said second tank is provided with a pair of said ventilation openings.
6. A non-aeration baffled synchronous nitrification and denitrification wastewater treatment method, which is characterized by using the non-aeration baffled synchronous nitrification and denitrification wastewater treatment system as set forth in any one of claims 1 to 5.
7. The non-aeration baffled synchronous nitrification and denitrification wastewater treatment method as claimed in claim 6, comprising the steps of:
1) Introducing nitrogen-containing wastewater into the vertical box body from the liquid inlet hole, flowing along the baffling type water flow channel, contacting with microbial membranes on the porous filler in the flowing process, and penetrating into the porous filler under the action of gravity and capillary action of the porous filler;
2) In the infiltration process, the wastewater is contacted with an outer nitrifying bacteria microbial membrane, and ammonia nitrogen in the wastewater is converted into nitrate and nitrite in an aerobic environment;
3) Then the nitrate and nitrite in the wastewater are contacted with the denitrifying bacteria microbial membrane at the inner layer, and under the anaerobic environment, the nitrate and nitrite are converted into nitrogen, and overflow from the water, so that the denitrification of the wastewater is realized.
8. The method for wastewater treatment by non-aeration baffled synchronous nitrification and denitrification as set forth in claim 7, wherein in the step 2), the nitrifying bacteria microbial film on the outer layer is connected with the external environment through the ventilation opening, an oxygen source is provided for the nitrifying bacteria microbial film, and nitrogen generated by the denitrifying bacteria microbial film is assisted to escape.
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