CN211770831U - Carbon source adding system for biochemical section of landfill leachate - Google Patents
Carbon source adding system for biochemical section of landfill leachate Download PDFInfo
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- CN211770831U CN211770831U CN201922484458.XU CN201922484458U CN211770831U CN 211770831 U CN211770831 U CN 211770831U CN 201922484458 U CN201922484458 U CN 201922484458U CN 211770831 U CN211770831 U CN 211770831U
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Abstract
The utility model belongs to the technical field of landfill leachate handles, more specifically relates to a biochemical section carbon source dosing system of landfill leachate. 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 utility model provides a biochemical section carbon source dosing system of landfill leachate can the effective control carbon source throw the dosage to can reduce the operation cost by a wide margin, can solve the excessive throwing of current one-level denitrification pond carbon source simultaneously and throw with, the carbon source utilization ratio is low, the carbon source is thrown with high costs, increase aeration energy consumption scheduling problem.
Description
Technical Field
The utility model belongs to the technical field of landfill leachate handles, more specifically relates to a biochemical section carbon source dosing system of landfill leachate.
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.
SUMMERY OF THE UTILITY MODEL
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, which is scientific and reasonable in setting, simple and convenient in operation, and dynamically adjustable in carbon source adding, avoids the problem of low utilization rate and cost increase caused by excessive carbon source adding, and enables the total nitrogen value of effluent clear liquid of the biochemical section treated by the landfill leachate to meet the requirement, thereby achieving the purposes of reducing the carbon source adding cost and improving the effluent quality of the biochemical section.
In order to realize the aim, the inventor provides a carbon source adding system for a biochemical section of landfill leachate, which comprises a water inlet unit, a denitrification/nitrification unit, a solid-liquid separation unit and a carbon source adding unit which are connected by pipelines, 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.
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 utility model provides a biochemical section carbon source dosing system of landfill leachate can the effective control carbon source throw the dosage to can reduce the operation cost by a wide margin, can solve the excessive throwing of current one-level denitrification pond carbon source simultaneously and throw with, the carbon source utilization ratio is low, the carbon source is thrown with high costs, increase aeration energy consumption scheduling problem. Generally, adopt the utility model provides a biochemical section carbon source dosing system of landfill leachate carries out the carbon source to the denitrification pond and throws, and the biochemical section of landfill leachate treatment goes out the total nitrogen value of water clear solution and reaches the standard, and the carbon source is thrown the addition and is accurate, carbon source and throw advantage such as with low costs, operation control method is simple, easy operation maintenance and biochemical section play water quality of water is good.
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 following detailed description of the utility model discloses a landfill leachate biochemical stage carbon source dosing system.
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.
Adopt the method for adding the carbon source by the carbon source adding system at the biochemical section of the landfill leachate 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 utility model discloses thereby well control system control carbon source is thrown the feeder frequency and is rised or reduce and throw the built-in converter of feeder apparatus and adjust the carbon source and throw inverter pump and realize through programmable controller control carbon source.
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 virtuous circle and make full use of resources, it is now common practice to return the nitrate that the nitrification tank produced to the denitrification tank, and therefore, in the preferred embodiment of the present invention, a first return pipe 2011 is further provided between the first-level nitrification tank and the first-level denitrification tank, and a second return pipe 2021 is further provided between the second-level nitrification tank and the second-level denitrification tank.
Specifically, the method for adding the carbon source adding system at the biochemical section of the landfill leachate provided by the utility model is explained 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.
Adopt the utility model provides a landfill leachate biochemical section carbon source dosing system carries out biochemical section carbon source's method, including following step:
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 more 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 scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the scope of the present invention.
Claims (6)
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 2, 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.
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| CN111018267A (en) * | 2019-12-31 | 2020-04-17 | 嘉园环保有限公司 | Carbon source adding system and method for landfill leachate biochemical section |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111018267A (en) * | 2019-12-31 | 2020-04-17 | 嘉园环保有限公司 | Carbon source adding system and method for landfill leachate biochemical section |
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