CN111018267A - Carbon source adding system and method for landfill leachate biochemical section - Google Patents
Carbon source adding system and method for landfill leachate biochemical section Download PDFInfo
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- CN111018267A CN111018267A CN201911408591.5A CN201911408591A CN111018267A CN 111018267 A CN111018267 A CN 111018267A CN 201911408591 A CN201911408591 A CN 201911408591A CN 111018267 A CN111018267 A CN 111018267A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 192
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 192
- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 99
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 238000012806 monitoring device Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000000926 separation method Methods 0.000 claims description 18
- 238000000108 ultra-filtration Methods 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 3
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 239000008103 glucose Substances 0.000 claims description 3
- QDRKDTQENPPHOJ-UHFFFAOYSA-N sodium ethoxide Chemical compound [Na+].CC[O-] QDRKDTQENPPHOJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000008676 import Effects 0.000 claims description 2
- 238000005273 aeration Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
The invention belongs to the technical field of landfill leachate treatment, and particularly relates to a carbon source adding system and method for a landfill leachate biochemical section. The carbon source adding system for the biochemical section of the landfill leachate comprises an online total nitrogen monitoring device, a carbon source storage device, a carbon source adding device, a carbon source metering device and a carbon source adding unit of a control system, and realizes accurate adding of a carbon source to a two-stage denitrification tank of the biochemical section of the landfill leachate by online monitoring of the total nitrogen value of effluent clear liquid, so that the problems of excessive carbon source adding or low carbon source utilization rate and the like caused by artificial constant carbon source adding are well solved, and the influence of too little carbon source adding on the stable standard of the total nitrogen value is further solved. The carbon source adding system and the adding method for the biochemical section of the landfill leachate provided by the invention can effectively control the adding amount of the carbon source, greatly reduce the operation cost, and simultaneously solve the problems of excessive carbon source adding, low carbon source utilization rate, high carbon source adding cost, increased aeration energy consumption and the like of the existing primary denitrification tank.
Description
Technical Field
The invention belongs to the technical field of landfill leachate treatment, and particularly relates to a carbon source adding system and method for a landfill leachate biochemical section.
Background
The landfill leachate has high pollutant concentration and extremely complex components, the water quality condition has larger fluctuation range along with the change of climatic conditions and the change of the landfill age limit, the ammonia nitrogen concentration in the landfill leachate is higher and higher along with the increase of the landfill age limit, the imbalance of the C/N value can cause great treatment difficulty, and the conditions provide great challenges for the stable operation of a landfill field of the landfill leachate.
In the process of treating the landfill leachate, activated sludge dominant bacteria during denitrification are heterotrophic bacteria, and organic matters are consumed in the denitrification process, so that sufficient organic carbon sources in the landfill leachate need to be ensured. In order to avoid the unbalance of the proportion of nutrient elements in the denitrification process in the landfill leachate and ensure the effective operation of the biological denitrification and denitrification process, a carbon source is required to be artificially added to meet the growth of microorganisms, thereby ensuring the stable operation of a treatment plant. At present, the carbon source adding mode of a denitrification tank of a landfill leachate treatment plant in China is mainly manual adding, generally, the carbon source is added at a constant amount through manual theoretical calculation, and excessive or insufficient carbon source adding is usually caused. When the carbon source is excessively added, the problems of excessive COD (chemical oxygen demand) of the outlet water, low utilization rate of the carbon source, resource waste, increased carbon source adding cost, increased aeration energy consumption, excessive ammonia nitrogen risk of the outlet water and the like are easy to occur; the problem that the total nitrogen of the effluent cannot stably reach the standard and the like can be caused by insufficient addition of the carbon source.
Therefore, how to accurately control the carbon source adding amount of the denitrification tank and ensure the efficient and stable operation of the landfill leachate treatment process is an urgent problem to be solved.
Disclosure of Invention
In view of the above technical problems in the background art, it is desirable to provide a carbon source adding system for a biochemical section of landfill leachate and an adding method thereof, wherein the carbon source adding system for the biochemical section of landfill leachate and the adding method thereof need to be scientific and reasonable in arrangement, simple and convenient to operate and dynamically adjustable in carbon source adding, so that the problem of low utilization rate and cost increase caused by excessive carbon source adding is avoided, and the total nitrogen value of the effluent clear liquid of the biochemical section for landfill leachate treatment can meet the requirements, thereby achieving the purposes of reducing the carbon source adding cost and improving the effluent quality of the biochemical section.
In order to achieve the above object, in a first aspect of the present invention, the inventors provide a carbon source adding system for a biochemical stage of landfill leachate, comprising a water inlet unit, a denitrification/nitrification unit, a solid-liquid separation unit and a carbon source adding unit which are connected by a pipeline, the carbon source adding unit comprises an online total nitrogen monitoring device, a carbon source storage device, a carbon source adding device, a carbon source metering device and a control system, the on-line total nitrogen monitoring device, the carbon source adding device and the carbon source metering device are respectively and electrically connected with the control system, the carbon source storage device, the carbon source adding device and the carbon source metering device are sequentially connected through pipelines, the carbon source metering device is arranged on a connecting pipe between the carbon source adding device and the denitrification/nitrification unit, the solid-liquid separation unit is provided with an inlet, an outlet and an ultrafiltration clear water tank, and the detection end of the on-line total nitrogen monitoring device is arranged in the ultrafiltration clear water tank.
In a second aspect of the present invention, the inventor provides a method for adding a carbon source adding system in a biochemical section of landfill leachate, and the method for adding a carbon source adding system in a biochemical section of landfill leachate according to the first aspect of the present invention comprises the following steps:
sequentially feeding the garbage percolate subjected to pretreatment into a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank and a solid-liquid separation unit to obtain effluent clear liquid and return sludge;
the online total nitrogen monitoring device detects and collects the total nitrogen value of the effluent clear liquid and transmits the total nitrogen value back to the control system;
the control system controls the amount of the carbon source added to the primary denitrification tank and the secondary denitrification tank by the carbon source adding device according to the total nitrogen value of the effluent clear liquid, wherein when the total nitrogen value of the effluent clear liquid is higher than 120mg/l, the adding frequency of the carbon source is adjusted to be increased by 3-5 HZ; when the total nitrogen value of the effluent clear liquid is lower than 110mg/l, adjusting the adding frequency of the carbon source to be reduced by 3-5 HZ; the ratio of the amount of the carbon source added into the first-stage denitrification tank to the amount of the carbon source added into the second-stage denitrification tank is 2-4.
Different from the prior art, the technical scheme at least has the following beneficial effects:
the method comprises the steps of arranging a carbon source adding unit comprising an online total nitrogen monitoring device, a carbon source storage device, a carbon source adding device, a carbon source metering device and a control system, and realizing accurate adding of a carbon source to a two-stage denitrification tank of a landfill leachate biochemical section by online monitoring of the total nitrogen value of effluent clear liquid, so that the problems of excessive carbon source adding or low carbon source utilization rate and the like caused by artificial constant carbon source adding are well solved, and the influence of too little carbon source adding on the stable standard of the total nitrogen value is well solved. The carbon source adding system and the adding method for the biochemical section of the landfill leachate provided by the invention can effectively control the adding amount of the carbon source, greatly reduce the operation cost, and simultaneously solve the problems of excessive carbon source adding, low carbon source utilization rate, high carbon source adding cost, increased aeration energy consumption and the like of the existing primary denitrification tank. Generally, by adopting the carbon source adding system and the adding method for the biochemical section of the landfill leachate provided by the invention, the total nitrogen value of the effluent clear liquid of the biochemical section for treating the landfill leachate reaches the standard, the adding amount of the carbon source is accurate, the adding cost of the carbon source is low, the operation control method is simple, the operation and the maintenance are easy, the effluent quality of the biochemical section is excellent, and the like.
Drawings
Fig. 1 is a carbon source adding system for a biochemical section of landfill leachate in a specific embodiment.
Description of reference numerals:
10. a water inlet unit;
20. a denitrification/nitrification unit;
201. a first-stage denitrification tank;
202. a first-stage nitrification tank;
203. a secondary denitrification tank;
204. a secondary nitrification tank;
30. a solid-liquid separation unit;
301. an inlet;
302. an outlet;
303. an ultrafiltration clean water tank;
304. a sludge return pipe;
40. a carbon source adding unit;
401. an online total nitrogen monitoring device;
402. a carbon source storage device;
403. a carbon source adding device;
404. a carbon source metering device;
4041. a first carbon source metering device;
4042. second carbon source metering device
405. And (5) controlling the system.
Detailed Description
The carbon source adding system for the biochemical section of the landfill leachate according to the first aspect of the invention and the carbon source adding method for the biochemical section of the landfill leachate according to the second aspect of the invention are explained in detail below.
Firstly, a carbon source adding system of a landfill leachate biochemical section in the first aspect of the invention is explained.
The utility model provides a landfill leachate biochemical segment carbon source dosing system, includes that pipe connection's the unit of throwing is intake unit, denitrification/nitrification unit, solid-liquid separation unit and carbon source, the unit is thrown to carbon source is thrown the feeder unit and is included online total nitrogen monitoring devices, carbon source storage device, carbon source and throw feeder unit, carbon source metering device and control system, online total nitrogen monitoring devices, carbon source are thrown feeder unit and carbon source metering device and are connected with the control system electricity respectively, carbon source storage device, carbon source are thrown feeder unit and carbon source metering device and loop through pipe connection, and carbon source metering device sets up on the connecting pipe between feeder unit and denitrification/nitrification unit is thrown to the carbon source, solid-liquid separation unit is provided with import, export and ultrafiltration clear water basin, online total nitrogen monitoring devices's sense terminal sets up in ultrafiltration clear water basin.
Preferably, the denitrification/nitrification unit comprises a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank which are sequentially connected by pipelines along the water flow direction.
Preferably, the carbon source metering device comprises a first carbon source metering device and a second carbon source metering device, the carbon source adding device, the first carbon source metering device and the first-stage denitrification tank are communicated through pipelines, and the carbon source adding device, the second carbon source metering device and the second-stage denitrification tank are communicated through pipelines.
Preferably, the solid-liquid separation unit is an ultrafiltration device, and is further provided with a sludge return pipe connected to the water inlet unit.
Preferably, the carbon source adding device is a carbon source adding variable frequency pump.
Preferably, a first return pipe is arranged between the first-stage nitrification tank and the first-stage denitrification tank, and a second return pipe is arranged between the second-stage nitrification tank and the second-stage denitrification tank.
Next, the adding method of the carbon source adding system for the biochemical section of the landfill leachate is explained.
A method for adding a carbon source adding system for a biochemical section of landfill leachate provided by the first aspect of the invention comprises the following steps:
sequentially feeding the garbage percolate subjected to pretreatment into a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank and a solid-liquid separation unit to obtain effluent clear liquid and return sludge;
the online total nitrogen monitoring device detects and collects the total nitrogen value of the effluent clear liquid and transmits the total nitrogen value back to the control system;
the control system controls the amount of the carbon source added to the primary denitrification tank and the secondary denitrification tank by the carbon source adding device according to the total nitrogen value of the effluent clear liquid, wherein when the total nitrogen value of the effluent clear liquid is higher than 120mg/l, the adding frequency of the carbon source is adjusted to be increased by 3-5 HZ; when the total nitrogen value of the effluent clear liquid is lower than 110mg/l, adjusting the adding frequency of the carbon source to be reduced by 3-5 HZ; the ratio of the amount of the carbon source added into the first-stage denitrification tank to the amount of the carbon source added into the second-stage denitrification tank is 2-4.
The control system controls the increase or decrease of the carbon source adding frequency by controlling a frequency converter arranged in the carbon source adding device through a programmable controller so as to adjust a carbon source adding frequency conversion pump.
Preferably, the effluent of the primary nitrification tank flows back to the primary denitrification tank, and the dissolved oxygen in the primary nitrification tank is controlled to be 0.3-2 mg/L; and the effluent of the secondary nitrification tank flows back to the secondary denitrification tank, and the dissolved oxygen in the secondary nitrification tank is controlled to be 1-5 mg/L. The dissolved oxygen can be measured by arranging an oxidation-reduction potential detection device to carry out on-line or manual monitoring to obtain the dissolved oxygen content data of the primary nitrification tank and the secondary nitrification tank. The return flow may be by electric pumping means as is conventional in the art.
Preferably, the carbon source is selected from one or more of methanol, glucose, sodium ethoxide, acetic acid and volatile fatty acids.
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application.
Referring to fig. 1, the embodiment provides a carbon source adding system for a biochemical section of landfill leachate, which includes a water inlet unit 10, a denitrification/nitrification unit 20, a solid-liquid separation unit 30 and a carbon source adding unit 40 that are connected by a pipeline, the carbon source adding unit 40 includes an online total nitrogen monitoring device 401, a carbon source storage device 402, a carbon source adding device 403, a carbon source metering device 404 and a control system 405, the online total nitrogen monitoring device 401, the carbon source adding device 403 and the carbon source metering device 404 are respectively and electrically connected with the control system 405, the carbon source storage device 402, the carbon source adding device 403 and the carbon source metering device 404 are sequentially connected by a pipeline, the carbon source metering device 404 is arranged on a connecting pipe between the carbon source adding device 403 and the denitrification/nitrification unit 20, the solid-liquid separation unit 30 is provided with an inlet 301, an outlet 302 and an ultrafiltration clear water, the detection end of the online total nitrogen monitoring device 401 is arranged in the ultrafiltration clean water tank 303.
For different properties of landfill sites and differences of pretreatment effects, the quality of the influent water of the biochemical section of the landfill leachate may be different, and the treatment process of the biochemical section may be designed according to different water qualities, for example, in different embodiments, the denitrification/nitrification unit 20 may include, but is not limited to, a primary denitrification tank 201, a primary nitrification tank 202, a secondary denitrification tank 203, and a secondary nitrification tank 204, which are sequentially connected by pipes along the water flow direction.
In order to feed more accurate amount of carbon source to the primary denitrification tank and the secondary denitrification tank, a carbon source metering device is arranged at the position close to each feeding point pipeline, the carbon source metering device 404 comprises a first carbon source metering device 4041 and a second carbon source metering device 4042, the carbon source feeding device 403, the first carbon source metering device 4041 and the primary denitrification tank 201 are communicated through pipelines, and the carbon source feeding device 403, the second carbon source metering device 4042 and the secondary denitrification tank 202 are communicated through pipelines.
Sludge and part of solid impurities brought by pretreatment are generated at the tail end of the biochemical treatment section of the landfill leachate, and in order to reduce the load of a treatment structure of the next stage, a solid-liquid separation unit 30 is arranged, and in a preferred embodiment, the solid-liquid separation unit is an ultrafiltration device, such as an ultrafiltration membrane or an ultrafiltration membrane component. The sludge after solid-liquid separation has a large amount of microbial active substances, which can have a positive effect in the nitrification and denitrification process of the landfill leachate, and therefore, the solid-liquid separation unit is also provided with a 304 connected to the water inlet unit.
In the actual operation process, the adding of the carbon source is performed by inputting a pulse frequency for setting the adding of the carbon source into a control system and sending a control to accelerate or slow the adding frequency according to a received feedback signal, and therefore, the carbon source adding device 403 is a carbon source adding variable frequency pump.
In order to make the whole system in a virtuous cycle and make full use of resources, it is now common practice to return the nitrate generated in the nitrification tank to the denitrification tank, and therefore, in a preferred embodiment of the present invention, a first return pipe 2011 is further disposed between the primary nitrification tank and the primary denitrification tank, and a second return pipe 2021 is further disposed between the secondary nitrification tank and the secondary denitrification tank.
Specifically, the method for adding the carbon source by using the carbon source adding system for the biochemical section of the landfill leachate provided by the invention is described as follows.
In this embodiment, the sample is landfill leachate generated from a certain household garbage landfill, and the water quality condition is shown in table 1.
TABLE 1 Water quality of landfill leachate from a domestic refuse landfill
| Index of water quality | Unit of | Numerical value |
| COD | mg/l | 5000-9000 |
| Ammonia nitrogen | mg/l | 1500-2000 |
| pH | - | 7-8 |
The treatment scale of the biochemical system running in a certain household garbage landfill is 1400m3/d。
The main structures are summarized as follows:
(1) first-stage denitrification tank and first-stage nitrification tank
The treated water amount is 1400m32 seats, each seat comprises a first-stage denitrification tank (effective tank capacity 2376 m)3) First-stage nitrification tank (effective tank capacity 3672 m)3) All are semi-buried steel concrete structures, and the top of the tank is covered with a cover.
(2) Two-stage denitrification tank and two-stage nitrification tank
The treated water amount is 1400m32 seats, each seat comprises a secondary denitrification tank (the effective tank volume is 540 m)3) And a second-stage nitrification tank (effective tank volume 540 m)3) All are semi-buried steel concrete structures, and the top of the tank is covered with a cover.
(3) Ultrafiltration system
The treated water amount is 1400m3And d, setting 6 groups, 6 branches in each group, and producing 240m of water in each group3And d. An external tubular ultrafiltration membrane is adopted, the material is PVDF, and the membrane area is 27.2m3Flux 60LMH was designed.
The method for feeding the carbon source to the biochemical section by adopting the carbon source feeding system for the biochemical section of the landfill leachate provided by the invention comprises the following steps:
sending the garbage leachate after pretreatment into a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank and a PVDF external tubular ultrafiltration membrane in sequence, wherein the effluent of the primary nitrification tank flows back to the primary denitrification tank, the effluent of the secondary nitrification tank flows back to the secondary denitrification tank, the dissolved oxygen of the primary nitrification tank is controlled to be about 0.5mg/L, and the dissolved oxygen of the secondary nitrification tank is controlled to be about 2mg/L, so as to obtain effluent clear liquid and return sludge;
arranging an online total nitrogen detector at the clear effluent liquid, detecting and collecting a total nitrogen value of the clear effluent liquid by using the online total nitrogen detector and transmitting the total nitrogen value back to the control system;
the control system controls the amount of the carbon source added to the primary denitrification tank and the secondary denitrification tank by the carbon source adding device according to the total nitrogen value of the effluent clear liquid, wherein when the total nitrogen value of the effluent clear liquid is higher than 120mg/l, the adding frequency of the carbon source is adjusted to be increased by 3-5 HZ; when the total nitrogen value of the effluent clear liquid is lower than 110mg/l, the adding frequency of the carbon source is adjusted to be reduced by 3-5 HZ. In the embodiment, methanol is selected as the added carbon source, and the ratio of the amount of the carbon source added in the primary denitrification tank to the amount of the carbon source added in the secondary denitrification tank is adjusted to be 2-4 according to the feedback signal of the carbon source metering device and the total nitrogen signal fed back. Through real-time accurate adding, the total nitrogen value of the effluent clear liquid is stabilized at 105-125mg/l, and the effluent quality is stably discharged.
In other different embodiments, the added carbon source can also be one or more of glucose, sodium ethoxide, acetic acid and volatile fatty acid. In other different specific embodiments, the effluent of the primary nitrification tank flows back to the primary denitrification tank, and the dissolved oxygen in the primary nitrification tank is controlled to be 0.3-2 mg/L; and the effluent of the secondary nitrification tank flows back to the secondary denitrification tank, and the dissolved oxygen in the secondary nitrification tank is controlled to be 1-5 mg/L.
Because the carbon source is continuously added, the total nitrogen of the effluent can be effectively controlled through real-time accurate addition, and the effluent quality of the landfill leachate biochemical section is improved.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (9)
1. The utility model provides a landfill leachate biochemical segment carbon source dosing system, its characterized in that, throw the unit including water intake unit, denitrification/nitrification unit, solid-liquid separation unit and carbon source of pipe connection, the carbon source is thrown the unit and is included online total nitrogen monitoring devices, carbon source storage device, carbon source and is thrown feeder apparatus, carbon source metering device and control system, online total nitrogen monitoring devices, carbon source are thrown feeder apparatus and carbon source metering device and are connected with the control system electricity respectively, carbon source storage device, carbon source are thrown feeder apparatus and carbon source metering device and loop through pipe connection, and carbon source metering device sets up on the connecting pipe between feeder apparatus and denitrification/nitrification unit is thrown to the carbon source, solid-liquid separation unit is provided with import, export and ultrafiltration clear water basin, online total nitrogen monitoring devices's sense terminal sets up in the ultrafiltration clear water basin.
2. The carbon source adding system for the biochemical segment of the landfill leachate as recited in claim 1, wherein the denitrification/nitrification unit comprises a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank and a secondary nitrification tank which are sequentially connected by pipelines along the water flow direction.
3. The carbon source adding system for the biochemical segment of the landfill leachate according to claim 2, wherein the carbon source metering device comprises a first carbon source metering device and a second carbon source metering device, the carbon source adding device, the first carbon source metering device and the first-stage denitrification tank are communicated through pipelines, and the carbon source adding device, the second carbon source metering device and the second-stage denitrification tank are communicated through pipelines.
4. The carbon source adding system for the biochemical section of the landfill leachate according to claim 1, wherein the solid-liquid separation unit is an ultrafiltration device and is further provided with a sludge return pipe connected to the water inlet unit.
5. The carbon source adding system for the biochemical segment of the landfill leachate according to claim 1, wherein the carbon source adding device is a carbon source adding variable frequency pump.
6. The carbon source adding system for the biochemical segment of the landfill leachate as recited in claim 1, wherein a first return pipe is further disposed between the primary nitrification tank and the primary denitrification tank, and a second return pipe is further disposed between the secondary nitrification tank and the secondary denitrification tank.
7. A method for adding a carbon source adding system in a biochemical section of landfill leachate is characterized in that the method for adding the carbon source adding system in the biochemical section of the landfill leachate disclosed by any one of claims 1 to 6 is adopted, and comprises the following steps:
sequentially feeding the garbage percolate subjected to pretreatment into a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank and a solid-liquid separation unit to obtain effluent clear liquid and return sludge;
the online total nitrogen monitoring device detects and collects the total nitrogen value of the effluent clear liquid and transmits the total nitrogen value back to the control system;
the control system controls the amount of the carbon source added to the primary denitrification tank and the secondary denitrification tank by the carbon source adding device according to the total nitrogen value of the effluent clear liquid, wherein when the total nitrogen value of the effluent clear liquid is higher than 120mg/l, the adding frequency of the carbon source is adjusted to be increased by 3-5 HZ; when the total nitrogen value of the effluent clear liquid is lower than 110mg/l, adjusting the adding frequency of the carbon source to be reduced by 3-5 HZ; the ratio of the amount of the carbon source added into the first-stage denitrification tank to the amount of the carbon source added into the second-stage denitrification tank is 2-4.
8. The dosing method according to claim 7, wherein the effluent of the primary nitrification tank flows back to the primary denitrification tank, and the dissolved oxygen in the primary nitrification tank is controlled to be 0.3-2 mg/L; and the effluent of the secondary nitrification tank flows back to the secondary denitrification tank, and the dissolved oxygen in the secondary nitrification tank is controlled to be 1-5 mg/L.
9. The dosing method according to claim 7, wherein the carbon source is selected from one or more of methanol, glucose, sodium ethoxide, acetic acid and volatile fatty acids.
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