CN220098816U - Full-quantity treatment device for leachate of household garbage landfill - Google Patents
Full-quantity treatment device for leachate of household garbage landfill Download PDFInfo
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- CN220098816U CN220098816U CN202321620494.4U CN202321620494U CN220098816U CN 220098816 U CN220098816 U CN 220098816U CN 202321620494 U CN202321620494 U CN 202321620494U CN 220098816 U CN220098816 U CN 220098816U
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- 238000007254 oxidation reaction Methods 0.000 claims abstract description 101
- 230000003647 oxidation Effects 0.000 claims abstract description 97
- 239000000149 chemical water pollutant Substances 0.000 claims abstract description 75
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 60
- 230000003197 catalytic effect Effects 0.000 claims abstract description 50
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 8
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 64
- 239000010802 sludge Substances 0.000 claims description 62
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- 238000000108 ultra-filtration Methods 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
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- 239000007788 liquid Substances 0.000 claims description 27
- 239000000945 filler Substances 0.000 claims description 17
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- 239000012141 concentrate Substances 0.000 abstract 1
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- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 9
- 230000001546 nitrifying effect Effects 0.000 description 9
- 238000005276 aerator Methods 0.000 description 8
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- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
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- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
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- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The utility model relates to the technical field of landfill leachate treatment, in particular to a full-scale treatment device for leachate in a household garbage landfill, which comprises a filter, a primary MBR system, a softening system, an ozone catalytic oxidation system and a secondary MBR system which are sequentially communicated, so that most of organic matters, ammonia nitrogen and total nitrogen in the leachate are firstly removed through the primary MBR system in the landfill leachate treatment process, then calcium salt and magnesium salt with higher concentration in the leachate are firstly removed through the softening system, and then non-biochemical matters in the leachate are subjected to chain scission treatment through the ozone catalytic oxidation system so as to be oxidized into micromolecular biochemical matters, and finally the secondary MBR system is used for fully reacting the landfill leachate so as to further remove the total nitrogen and the organic matters in the wastewater, thereby enabling the landfill leachate to be efficiently treated, enabling the treated sewage to reach the emission standard, and realizing full-scale treatment without concentrate in the treatment process.
Description
Technical Field
The utility model relates to the technical field of landfill leachate treatment, in particular to a full-scale treatment device for landfill leachate.
Background
The leachate of the domestic refuse landfill has complex water quality components, large concentration change of pollutants, deep chromaticity, more toxic substances, large content of bacteria and viruses and the like, and has the main water quality characteristics as follows:
(1) BOD in leachate at initial stage of landfill 5 /COD Cr The preparation method is relatively high and is easy to biodegrade; with the increase of landfill years, BOD 5 /COD Cr Gradually decrease and the biodegradability gradually worsens, and BOD is increased in 2-5 years after the landfill is filled with the sealing field 5 /COD Cr Gradually reducing to nearly 0.1;
(2) The ammonia nitrogen and total nitrogen concentration is higher, the ammonia state is mainly, the concentration is generally 800-2500mg/L, and the concentration can reach more than 3000mg/L respectively.
The current treatment of the leachate of the household garbage landfill comprises the following processes:
1. MBR+double membrane method (NF+RO) treatment process, and the concentrated solution is recycled to the landfill; 2. two-stage DTRO+ammonia stripping, and recharging concentrated solution into landfill; 3. MVR evaporation and mother liquor recharging landfill.
The disadvantages of method 1 are: by adopting an MBR+double membrane method (NF+RO) treatment process, although organic matters, ammonia nitrogen and total nitrogen in the percolate can be effectively removed, non-biochemical matters and salts in the percolate can not be effectively removed, and are intercepted in the concentrated solution by NF and RO membranes. The concentrated solution adopts a recharging landfill, and the percolate is reformed, so that non-biochemical substances and salts in the percolate are continuously accumulated, and the stable and normal operation of the whole process is affected;
the disadvantages of method 2 are: the method is characterized in that the leachate is treated by adopting DTRO, the substance is separation of pollutants, the removal of the pollutants is not realized, the separated pollutants exist in concentrated solution, the concentrated solution adopts a recharging landfill, and the leachate is reformed, so that the pollutants and the salt in the leachate are continuously accumulated, and the stable and normal operation of the whole process is influenced;
the disadvantages of method 3 are: the MVR evaporation process is used for treating the percolate, so that pollutant removal is not realized, the pollutant finally exists in the crystal salt and the mother solution, only the transfer of the pollutant is realized, and the evaporator Yi Jiegou is corroded and cannot stably operate for a long time.
Therefore, we propose a device for fully treating percolate in a domestic refuse landfill, which is put into use to solve the problems.
Disclosure of Invention
The utility model aims to provide a full-scale treatment device for leachate in a household garbage landfill so as to realize efficient and full-scale treatment of the leachate in the household garbage landfill.
In order to achieve the above purpose, the present utility model provides the following technical solutions: a full-scale treatment device for leachate in a household garbage landfill comprises a filter, a primary MBR system, a softening system, an ozone catalytic oxidation system and a secondary MBR system which are sequentially communicated;
the filter is used for filtering and removing large particulate matters in the landfill leachate;
the primary MBR system is used for degrading organic matters, ammonia nitrogen and total nitrogen in the landfill leachate after being filtered by the filter once;
the softening system is used for removing calcium salt and magnesium salt with higher concentration in the landfill leachate after primary degradation of the primary MBR system, so that the hardness of the leachate is reduced;
the ozone catalytic oxidation system is used for carrying out catalytic oxidation on non-biochemical substances in the landfill leachate, so that the non-biochemical substances are broken into micromolecular biochemical substances;
the secondary MBR system is used for carrying out secondary degradation on organic matters and total nitrogen in the landfill leachate after catalytic oxidation.
Preferably, the one-level MBR system is including the anaerobic ammonia oxidation pond, denitrification pond, short-cut nitrifying pond, nitrifying pond and the one-level milipore filter of intercommunication in proper order, be provided with first biological filler in the anaerobic ammonia oxidation pond, be linked together through one-level ultrafiltration intake pump between one-level milipore filter and the nitrifying pond, the play mud mouth of one-level milipore filter is linked together with the denitrification pond, all be provided with first aeration pipe in short-cut nitrifying pond and the nitrifying pond, first aeration pipe is linked together with outside air-blower, all be provided with first agitator in anaerobic ammonia oxidation pond and the denitrification pond.
Preferably, the short-cut nitrification tank is communicated with the anaerobic ammonia oxidation tank through a short-cut nitrification liquid reflux pump.
Preferably, the softening system comprises a reaction tank, a high-efficiency sedimentation tank middle water tank and a softening membrane which are sequentially communicated, wherein the reaction tank is communicated with a liquid outlet of the first-stage ultrafiltration membrane, a stirrer is arranged in the reaction tank, the softening membrane is communicated with the middle water tank through a softening membrane water inlet pump, and a mud outlet of the softening membrane is communicated with the reaction tank.
Preferably, the ozone catalytic oxidation system comprises an ozone generator and an ozone catalytic oxidation reactor which are matched with each other, and the ozone catalytic oxidation reactor is communicated with a liquid outlet of the softening film.
Preferably, the ozone catalytic oxidation system further comprises an exhaust gas destructor, and the exhaust gas destructor is mounted on an exhaust pipe of the ozone catalytic oxidation reactor.
Preferably, the second MBR system comprises a biological contact denitrification tank, a biological contact oxidation tank and a second ultrafiltration membrane which are sequentially communicated, the biological contact denitrification tank is communicated with a liquid outlet of an ozone catalytic oxidation reactor, a second biological filler and a second stirrer are arranged in the biological contact denitrification tank, a third biological filler and a second aeration pipe are arranged in the biological contact oxidation tank, the second aeration pipe is communicated with an external blower, the second ultrafiltration membrane is communicated with the biological contact oxidation tank through a second ultrafiltration water inlet pump, and a mud outlet of the second ultrafiltration membrane is communicated with the biological contact denitrification tank.
Preferably, the sludge treatment system comprises a sludge concentration tank and a sludge dewatering device, wherein the sludge concentration tank is communicated with the sludge dewatering device through a sludge pump, a sludge outlet of the primary ultrafiltration membrane, a sludge outlet of the efficient sedimentation tank and a sludge outlet of the secondary ultrafiltration membrane are all communicated with the sludge concentration tank, and a supernatant liquid outlet of the sludge concentration tank and a liquid outlet of the sludge dewatering device are both communicated with the anaerobic ammonia oxidation tank.
Compared with the prior art, the utility model has the beneficial effects that:
the treatment device comprises a primary MBR system, a softening system, an ozone catalytic oxidation system and a secondary MBR system, wherein most of organic matters, ammonia nitrogen and total nitrogen in leachate are removed for the first time through the primary MBR system in the treatment process of the landfill leachate, calcium salt and magnesium salt with higher concentration in the leachate are removed through the softening system, non-biochemical substances in the leachate are subjected to chain scission treatment through the ozone catalytic oxidation system so as to be oxidized into substances with small molecules capable of being biochemical, and finally the total nitrogen and the organic matters in wastewater are further removed through full reaction of the landfill leachate through the secondary MBR system, so that the landfill leachate can be efficiently treated, sewage obtained through treatment can reach the standard and be discharged, no concentrated solution is generated in the treatment process, full quantization treatment is realized, and the whole treatment device can fully treat and discharge non-biochemical substances and salt in the treatment process, and cannot be accumulated, so that the treatment stability of the device is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a full-scale processing apparatus according to the present utility model;
FIG. 2 is a schematic diagram of the primary MBR system of the present utility model;
FIG. 3 is a schematic diagram of a softening system according to the present utility model;
FIG. 4 is a schematic diagram of an ozone catalytic oxidation system according to the present utility model;
FIG. 5 is a schematic diagram of a two-stage MBR system according to the present utility model;
FIG. 6 is a schematic diagram of a sludge treatment system according to the present utility model.
In the drawings, the list of components represented by the various numbers is as follows:
1. a filter;
2. a primary MBR system; 21. an anaerobic ammoxidation tank; 22. a denitrification tank; 23. a short-cut nitrification tank; 231. a short-cut nitrification liquid reflux pump; 24. a nitrifying pond; 25. a first-stage ultrafiltration membrane; 26. a first biological filler; 27. a primary ultrafiltration water inlet pump; 28. a first aerator pipe; 29. a first agitator;
3. a softening system; 31. a reaction tank; 32. an efficient sedimentation tank; 33. a middle pool; 34. softening the film; 35. a stirrer; 36. softening the membrane water inlet pump;
4. an ozone catalytic oxidation system; 41. an ozone generator; 42. an ozone catalytic oxidation reactor; 43. a tail gas disrupter;
5. a secondary MBR system; 51. biological contact denitrification tank; 52. a biological contact oxidation pond; 53. a secondary ultrafiltration membrane; 54. a second biological filler; 55. a second stirrer; 56. a third biological filler; 57. a second aerator pipe; 58. a secondary ultrafiltration water inlet pump;
6. a blower;
7. a sludge treatment system; 71. a sludge concentration tank; 72. a sludge dewatering device; 73. a sludge pump.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 6, the first technical scheme provided by the present utility model is as follows:
a full-scale treatment device for leachate in a household garbage landfill comprises a filter 1, a primary MBR system 2, a softening system 3, an ozone catalytic oxidation system 4 and a secondary MBR system 5 which are sequentially communicated;
the filter 1 is used for filtering and removing large particulate matters in the landfill leachate;
the primary MBR system 2 is used for degrading organic matters, ammonia nitrogen and total nitrogen in the landfill leachate filtered by the filter 1 once;
the softening system 3 is used for removing calcium salt and magnesium salt with higher concentration in the landfill leachate after primary degradation of the primary MBR system 2, so that the hardness of the leachate is reduced;
the ozone catalytic oxidation system 4 is used for carrying out catalytic oxidation on non-biochemical substances in the landfill leachate so as to break chains into micromolecular biochemical substances;
the secondary MBR system 5 is used for carrying out secondary degradation on organic matters and total nitrogen in the landfill leachate after catalytic oxidation.
Specifically, the primary MBR system 2 comprises an anaerobic ammonia oxidation tank 21, a denitrification tank 22, a short-cut nitrification tank 23, a nitrification tank 24 and a primary ultrafiltration membrane 25 which are sequentially communicated, a first biological filler 26 is arranged in the anaerobic ammonia oxidation tank 21, the primary ultrafiltration membrane 25 is communicated with the nitrification tank 24 through a primary ultrafiltration water inlet pump 27, a mud outlet of the primary ultrafiltration membrane 25 is communicated with the denitrification tank 22, first aeration pipes 28 are arranged in the short-cut nitrification tank 23 and the nitrification tank 24, the first aeration pipes 28 are communicated with an external blower 6, and first stirrers 29 are arranged in the anaerobic ammonia oxidation tank 21 and the denitrification tank 22.
From the above description, it is clear that: the method comprises the steps of firstly treating ammonia nitrogen in landfill leachate through an anaerobic ammonia oxidation tank, then denitrifying the landfill leachate through a denitrification tank, then nitrifying the residual ammonia nitrogen in the landfill leachate into nitrite through a short-range nitrification tank, and finally oxidizing nitrite and organic matters into nitrate through a nitrification tank, so that the organic matters, ammonia nitrogen and total nitrogen content in the landfill leachate are fully removed, the air content in the short-range nitrification tank and the air content in the nitrification tank can be controlled through the arrangement of a first aerator pipe and an air blower, the treatment effect is further guaranteed, and the reaction effect can be improved through the arrangement of a first stirrer.
Specifically, the short-cut nitrification tank 23 is communicated with the anaerobic ammonia oxidation tank 21 by a short-cut nitrification liquid reflux pump 231.
From the above description, it is clear that: nitrite generated in the short-cut nitrification tank can flow back to the anaerobic ammonia oxidation tank through a reflux pump to perform anaerobic ammonia oxidation reaction with influent ammonia nitrogen, and nitrite generated by the reaction is fully utilized.
Specifically, the softening system 3 comprises a reaction tank 31, a middle water tank 33 of a high-efficiency sedimentation tank 32 and a softening membrane 34 which are sequentially communicated, the reaction tank 31 is communicated with a liquid outlet of the first-stage ultrafiltration membrane 25, a stirrer 35 is arranged in the reaction tank 31, the softening membrane 34 is communicated with the middle water tank 33 through a softening membrane water inlet pump 36, and a mud outlet of the softening membrane 34 is communicated with the reaction tank 31.
From the above description, it is clear that: ca in landfill leachate can be treated through setting up of reaction tank and mixer 2+ 、Mg 2+ And carrying out full reaction treatment, then carrying out precipitation separation through a precipitation tank, and finally filtering through a softening membrane to thoroughly remove the non-precipitated substances, thereby realizing the softening treatment of the landfill leachate and facilitating the subsequent ozone oxidation treatment.
Specifically, the ozone catalytic oxidation system 4 includes an ozone generator 41 and an ozone catalytic oxidation reactor 42 that are mutually matched, and the ozone catalytic oxidation reactor 42 is communicated with the liquid outlet of the softening film 34.
From the above description, it is clear that: the non-biochemical substances in the landfill leachate can be subjected to chain scission treatment through ozone reaction treatment, so that the non-biochemical substances are oxidized into substances with small molecular energy for biochemical treatment, and the subsequent secondary MBR treatment is facilitated.
Specifically, the ozone catalytic oxidation system 4 further includes an exhaust gas destructor 43, and the exhaust gas destructor 43 is mounted on the exhaust pipe of the ozone catalytic oxidation reactor 42.
From the above description, it is clear that: the tail gas destructor can destroy the ozone which is not completely reacted, thereby realizing harmless emission.
Specifically, the secondary MBR system 5 includes a biological contact denitrification tank 51, a biological contact oxidation tank 52 and a secondary ultrafiltration membrane 53 which are sequentially communicated, the biological contact denitrification tank 51 is communicated with a liquid outlet of the ozone catalytic oxidation reactor 42, a second biological filler 54 and a second stirrer 55 are arranged in the biological contact denitrification tank 51, a third biological filler 56 and a second aerator pipe 57 are arranged in the biological contact oxidation tank 52, the second aerator pipe 57 is communicated with an external blower 6, the secondary ultrafiltration membrane 53 is communicated with the biological contact oxidation tank 52 through a secondary ultrafiltration water inlet pump 58, and a mud outlet of the secondary ultrafiltration membrane 53 is communicated with the biological contact denitrification tank 51.
From the above description, it is clear that: firstly, the percolate enters a biological contact denitrification tank, a biological filler and a stirrer are arranged in the biological contact denitrification tank, and the percolate and the refluxed nitrified liquid are subjected to full denitrification reaction in the biological contact denitrification tank, so that total nitrogen and organic matters in the wastewater are further removed.
Specifically, the sludge treatment system 7 is further included, the sludge treatment system 7 comprises a sludge concentration tank 71 and a sludge dewatering device 72, the sludge concentration tank 71 and the sludge dewatering device 72 are communicated through a sludge pump 73, a sludge outlet of the primary ultrafiltration membrane 25, a sludge outlet of the high-efficiency sedimentation tank 32 and a sludge outlet of the secondary ultrafiltration membrane 53 are all communicated with the sludge concentration tank 71, and a supernatant liquid outlet of the sludge concentration tank 71 and a liquid outlet of the sludge dewatering device 72 are all communicated with the anaerobic ammonia oxidation tank 21.
As shown in fig. 1 to 6, an embodiment of the above technical solution is as follows:
as shown in fig. 1: a full-scale treatment device for leachate in a household garbage landfill comprises a filter 1, a primary MBR system 2, a softening system 3, an ozone catalytic oxidation system 4 and a secondary MBR system 5 which are sequentially communicated;
as shown in fig. 1: the filter 1 is used for filtering and removing large particulate matters in the landfill leachate, and the filter intercepts the foreign slag outward transportation treatment;
as shown in fig. 2: the primary MBR system 2 is used for degrading organic matters, ammonia nitrogen and total nitrogen in landfill leachate filtered by the filter 1 once, the primary MBR system 2 comprises an anaerobic ammonia oxidation tank 21, a denitrification tank 22, a short-cut nitrification tank 23, a nitrification tank 24 and a primary ultrafiltration membrane 25 which are sequentially communicated, a first biological filler 26 is arranged in the anaerobic ammonia oxidation tank 21, the primary ultrafiltration membrane 25 is communicated with the nitrification tank 24 through a primary ultrafiltration water inlet pump 27, a mud outlet of the primary ultrafiltration membrane 25 is communicated with the denitrification tank 22, first aeration pipes 28 are arranged in the short-cut nitrification tank 23 and the nitrification tank 24, the first aeration pipes 28 are communicated with an external blower 6, first stirrers 29 are arranged in the anaerobic ammonia oxidation tank 21 and the denitrification tank 22, and the nitrification tank 23 is communicated with the anaerobic ammonia oxidation tank 21 through a short-cut nitrification liquid reflux pump 231;
as shown in fig. 3: the softening system 3 is used for removing calcium salt and magnesium salt with higher concentration in the landfill leachate after primary degradation of the primary MBR system 2, the hardness of the leachate is reduced, the softening system 3 comprises a reaction tank 31, a high-efficiency sedimentation tank 32, a middle water tank 33 and a softening membrane 34 which are sequentially communicated, the high-efficiency sedimentation tank 32 is an inclined tube sedimentation tank, the reaction tank 31 is communicated with a liquid outlet of the primary ultrafiltration membrane 25, a stirrer 35 is arranged in the reaction tank 31, the softening membrane 34 is communicated with the middle water tank 33 through a softening membrane water inlet pump 36, and a mud outlet of the softening membrane 34 is communicated with the reaction tank 31;
as shown in fig. 4: the ozone catalytic oxidation system 4 is used for carrying out catalytic oxidation on non-biochemical substances in the landfill leachate to break chains into substances with small molecules capable of being biochemically treated, the ozone catalytic oxidation system 4 comprises an ozone generator 41, an ozone catalytic oxidation reactor 42 and a tail gas breaker 43 which are matched with each other, the ozone catalytic oxidation reactor 42 is communicated with a liquid outlet of the softening membrane 34, and the tail gas breaker 43 is arranged on an exhaust pipe of the ozone catalytic oxidation reactor 42;
as shown in fig. 5: the secondary MBR system 5 is used for carrying out secondary degradation on organic matters and total nitrogen in the landfill leachate after catalytic oxidation, the secondary MBR system 5 comprises a biological contact denitrification tank 51, a biological contact oxidation tank 52 and a secondary ultrafiltration membrane 53 which are sequentially communicated, the biological contact denitrification tank 51 is communicated with a liquid outlet of the ozone catalytic oxidation reactor 42, a second biological filler 54 and a second stirrer 55 are arranged in the biological contact denitrification tank 51, a third biological filler 56 and a second aerator pipe 57 are arranged in the biological contact oxidation tank 52, the second aerator pipe 57 is communicated with an external blower 6, the secondary ultrafiltration membrane 53 is communicated with the biological contact oxidation tank 52 through a secondary ultrafiltration water inlet pump 58, and a mud outlet of the secondary ultrafiltration membrane 53 is communicated with the biological contact denitrification tank 51.
As shown in fig. 6: still include sludge treatment system 7, sludge treatment system 7 includes sludge concentration pond 71 and sludge dewatering device 72, is linked together through sludge pump 73 between sludge concentration pond 71 and the sludge dewatering device 72, and the play mud mouth of one-level milipore filter 25, the play mud mouth of high-efficient sedimentation tank 32 and the play mud mouth of second grade milipore filter 53 all are linked together with sludge concentration pond 71, and the supernatant liquid outlet of sludge concentration pond 71 and the liquid outlet of sludge dewatering device 72 all are linked together with anaerobic ammonia oxidation pond 21.
The treatment principle of the landfill leachate of the above embodiment is as follows:
s1: discharging the landfill leachate into a filter 1 for filtering, removing large-particle impurity substances to obtain first landfill leachate, and carrying out outward treatment on the filtered particle substances;
s2: discharging the first landfill leachate into an anaerobic ammonia oxidation tank 21, keeping the anaerobic ammonia oxidation tank 21 in an anaerobic state, enabling anaerobic ammonia oxidation bacteria to grow on a biological filler in an attached mode, enabling ammonia nitrogen in the inflow water and nitrite flowing back from a short-cut nitrification tank 23 to react under the action of the anaerobic ammonia oxidation bacteria to generate nitrogen and nitrate, and removing the ammonia nitrogen in the first landfill leachate to obtain a second landfill leachate;
s3: the second landfill leachate flows into the denitrification tank 22 to carry out denitrification reaction to obtain third landfill leachate, and nutrient solution is added into the denitrification tank 22 in the denitrification reaction process to supplement carbon sources so as to promote the smooth progress of denitrification;
s4: the third landfill leachate flows into a short-cut nitrification tank 23, a blower 6 is started, air is provided for the short-cut nitrification tank 23 through a first aerator pipe 28, DO in the short-cut nitrification tank 23 is controlled within the range of 0.5-1.0mg/L, nitrite is enabled to obtain dominant growth, nitrate is inhibited from growing in the short-cut, ammonia nitrogen in wastewater is nitrified into nitrite only, ammonia nitrogen in the third landfill leachate is nitrified into nitrite, fourth landfill leachate is obtained, and part of the fourth landfill leachate flows back into an anaerobic ammonia oxidation tank 21 through a short-cut nitrification liquid reflux pump 29 to perform anaerobic ammonia oxidation reaction with the influent ammonia nitrogen;
s5: most of the fourth landfill leachate flows into the nitrifying pond 24, a blower 6 is started, DO in the nitrifying pond 24 is controlled within a range of 2-3.0mg/L, organic matters in the fourth landfill leachate are removed through oxidization, and ammonia nitrogen and nitrite remained in the fourth landfill leachate are further nitrified into nitrate, so that fifth landfill leachate is obtained;
s6: pumping the fifth landfill leachate into a first ultrafiltration membrane 25 through a first ultrafiltration water inlet pump 27 for mud-water separation to obtain sixth landfill leachate, and refluxing the separated sludge into a denitrification tank 22;
after the percolate is treated by the primary MBR system, most of organic matters, ammonia nitrogen and total nitrogen in water are removed, but the percolate also contains non-biochemical substances such as humic acid and the like, which cannot be removed biochemically, and the broken-chain treatment must be carried out in an ozone oxidation mode so as to oxidize the substances into micromolecule substances capable of being biochemically removed by the secondary MBR. Since the hardness of the leachate treated by the primary MBR is high, i.e. the leachate contains high concentration of calcium salt and magnesium salt, these substances affect the ozone oxidation, and therefore must be removed before the ozone oxidation, and the softening process is as follows:
s7: the sixth landfill leachate flows into the reaction tank 31 and flows toThe reaction tank 31 is sequentially added with alkali and sodium carbonate and with Ca in the sixth landfill leachate 2+ And Mg (magnesium) 2+ Fully reacts to generate CaCO 3 MgCO 3 Obtaining seventh landfill leachate;
s8: the seventh landfill leachate flows into a high-efficiency sedimentation tank 32 (inclined tube sedimentation tank) for sedimentation and separation, and CaCO is removed 3 MgCO 3 Then the waste water flows into an intermediate water tank to obtain eighth landfill leachate;
s9: pumping the eighth landfill leachate into the softening membrane 34 by a softening membrane water inlet pump 36 for membrane filtration to obtain ninth landfill leachate, and filtering to obtain CaCO 3 And MgCO 3 Back flow into the reaction tank 31;
s10: the ninth landfill leachate flows into the ozone catalytic oxidation reactor 42, and fully contacts with ozone generated by the ozone generator 41 to generate catalytic oxidation reaction, so that non-biochemical substances are oxidized into micromolecular biochemical substances by ozone, tenth landfill leachate is obtained, and unreacted complete ozone gas is treated by the tail gas destructor 43 and is discharged harmlessly, wherein the ozone oxidation mechanism is that intermediate products such as hydroxyl free radicals with very strong oxidizing property are generated after ozone molecules and organic matters in a water body are decomposed in the water body under alkaline conditions, and more hydroxyl free radicals with extremely high oxidation-reduction potential are generated through catalyst reinforcement, so that organic pollutants are completely degraded. Non-biochemical substances (such as humic acid) in the percolate are oxidized into micromolecular biochemical substances by ozone, and unreacted ozone gas is discharged harmlessly after being treated by a tail gas destructor;
s11: the tenth landfill leachate flows into the biological contact denitrification tank 51 to perform full denitrification reaction, and total nitrogen and organic matters in the tenth landfill leachate are further removed to obtain eleventh landfill leachate;
s12: the eleventh landfill leachate flows into the biological contact oxidation tank 52 and starts the blower 6 to fully aerate the biological contact oxidation tank 52, so that organic matters in the eleventh landfill leachate are further oxidized and removed to obtain twelfth landfill leachate;
s13: pumping the twelfth garbage percolate into a second-stage ultrafiltration membrane 53 through a second-stage ultrafiltration water inlet pump 58 for mud-water separation, discharging the obtained permeate up to the standard, and refluxing the sludge obtained by filtering through the second-stage ultrafiltration membrane 53 into a biological contact denitrification tank 51;
finally, in order to enable the sludge to be subjected to innocent treatment, the sludge generated in each process is subjected to the following treatment:
the surplus sludge separated by the first-stage ultrafiltration membrane 25 in the step S6, the sediment sludge of the high-efficiency sedimentation tank 32 in the step S8 and the surplus sludge separated by the second-stage ultrafiltration membrane 53 in the step S13 are discharged into the sludge concentration tank 71 for concentration treatment and then pumped into the sludge dewatering device 72 by the sludge pump 73 for dewatering treatment, the dewatered sludge is transported to be properly treated, and the filtrate produced by dewatering and the supernatant of the sludge concentration tank 71 are fed into the anaerobic ammonia oxidation tank 21 for treatment.
The treatment device comprises a primary MBR system, a softening system, an ozone catalytic oxidation system and a secondary MBR system, wherein most of organic matters, ammonia nitrogen and total nitrogen in leachate are removed through the primary MBR system for the first time in the treatment process of the landfill leachate, calcium salt and magnesium salt with higher concentration in the leachate are removed through the softening system, non-biochemical substances in the leachate are subjected to chain scission treatment through the ozone catalytic oxidation system so as to be oxidized into substances with small molecules capable of being biochemical, and finally the total nitrogen and the organic matters in wastewater are further removed through full reaction of the landfill leachate through the secondary MBR system, so that the landfill leachate can be efficiently treated, the treated sewage can be discharged up to the standard, no concentrated solution is generated in the treatment process, and full quantization treatment is realized.
In the description of the present utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present utility model have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the claims and their equivalents.
Claims (8)
1. A domestic waste landfill leachate full-scale treatment device is characterized in that: comprises a filter (1), a primary MBR system (2), a softening system (3), an ozone catalytic oxidation system (4) and a secondary MBR system (5) which are communicated in sequence;
the filter (1) is used for filtering and removing large particulate matters in the landfill leachate;
the primary MBR system (2) is used for degrading organic matters, ammonia nitrogen and total nitrogen in the landfill leachate filtered by the filter (1) once;
the softening system (3) is used for removing calcium salt and magnesium salt with higher concentration in the landfill leachate after primary degradation of the primary MBR system (2), so that the hardness of the leachate is reduced;
the ozone catalytic oxidation system (4) is used for carrying out catalytic oxidation on non-biochemical substances in the landfill leachate so as to break chains into small-molecular biochemical substances;
the secondary MBR system (5) is used for carrying out secondary degradation on organic matters and total nitrogen in the landfill leachate after catalytic oxidation.
2. The full-scale treatment device for leachate in a domestic refuse landfill according to claim 1, wherein: the primary MBR system (2) comprises an anaerobic ammonia oxidation pond (21), a denitrification pond (22), a short-cut nitrification pond (23), a nitrification pond (24) and a primary ultrafiltration membrane (25) which are sequentially communicated, a first biological filler (26) is arranged in the anaerobic ammonia oxidation pond (21), the primary ultrafiltration membrane (25) is communicated with the nitrification pond (24) through a primary ultrafiltration water inlet pump (27), a mud outlet of the primary ultrafiltration membrane (25) is communicated with the denitrification pond (22), first aeration pipes (28) are arranged in the short-cut nitrification pond (23) and the nitrification pond (24), the first aeration pipes (28) are communicated with an external blower (6), and first stirrers (29) are arranged in the anaerobic ammonia oxidation pond (21) and the denitrification pond (22).
3. A domestic refuse landfill leachate full-scale treatment device according to claim 2, wherein: the short-cut nitrification tank (23) is communicated with the anaerobic ammonia oxidation tank (21) through a short-cut nitrification liquid reflux pump (231).
4. A domestic refuse landfill leachate full-scale treatment device according to claim 2, wherein: the softening system (3) comprises a reaction tank (31), a high-efficiency sedimentation tank (32), a middle water tank (33) and a softening membrane (34) which are sequentially communicated, the reaction tank (31) is communicated with a liquid outlet of a primary ultrafiltration membrane (25), a stirrer (35) is arranged in the reaction tank (31), the softening membrane (34) is communicated with the middle water tank (33) through a softening membrane water inlet pump (36), and a mud outlet of the softening membrane (34) is communicated with the reaction tank (31).
5. The device for treating the total amount of leachate in a domestic refuse landfill according to claim 4, wherein: the ozone catalytic oxidation system (4) comprises an ozone generator (41) and an ozone catalytic oxidation reactor (42) which are matched with each other, and the ozone catalytic oxidation reactor (42) is communicated with a liquid outlet of the softening film (34).
6. The device for treating the total amount of leachate in a domestic refuse landfill according to claim 5, wherein: the ozone catalytic oxidation system (4) further comprises an exhaust gas destructor (43), and the exhaust gas destructor (43) is arranged on an exhaust pipe of the ozone catalytic oxidation reactor (42).
7. The device for treating the total amount of leachate in a domestic refuse landfill according to claim 5, wherein: the secondary MBR system (5) comprises a biological contact denitrification tank (51), a biological contact oxidation tank (52) and a secondary ultrafiltration membrane (53) which are sequentially communicated, the biological contact denitrification tank (51) is communicated with a liquid outlet of an ozone catalytic oxidation reactor (42), a second biological filler (54) and a second stirrer (55) are arranged in the biological contact denitrification tank (51), a third biological filler (56) and a second aeration pipe (57) are arranged in the biological contact oxidation tank (52), the second aeration pipe (57) is communicated with an external blower (6), the secondary ultrafiltration membrane (53) is communicated with the biological contact oxidation tank (52) through a secondary ultrafiltration water inlet pump (58), and a mud outlet of the secondary ultrafiltration membrane (53) is communicated with the biological contact denitrification tank (51).
8. The device for treating the total amount of leachate in a domestic refuse landfill according to claim 7, wherein: still include sludge treatment system (7), sludge treatment system (7) include sludge concentration pond (71) and sludge dewatering device (72), be linked together through sludge pump (73) between sludge concentration pond (71) and the sludge dewatering device (72), the play mud mouth of one-level milipore filter (25), the play mud mouth of high-efficient sedimentation tank (32) and the play mud mouth of second grade milipore filter (53) all are linked together with sludge concentration pond (71), the supernatant liquid outlet of sludge concentration pond (71) and the liquid outlet of sludge dewatering device (72) all are linked together with anaerobic ammonia oxidation pond (21).
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| CN202321620494.4U CN220098816U (en) | 2023-06-26 | 2023-06-26 | Full-quantity treatment device for leachate of household garbage landfill |
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| CN202321620494.4U CN220098816U (en) | 2023-06-26 | 2023-06-26 | Full-quantity treatment device for leachate of household garbage landfill |
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