CN211445406U - Landfill leachate treatment device - Google Patents

Landfill leachate treatment device Download PDF

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Publication number
CN211445406U
CN211445406U CN201921580602.3U CN201921580602U CN211445406U CN 211445406 U CN211445406 U CN 211445406U CN 201921580602 U CN201921580602 U CN 201921580602U CN 211445406 U CN211445406 U CN 211445406U
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China
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treatment
percolate
tank
landfill leachate
leachate
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CN201921580602.3U
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Inventor
孔芹
徐璜
张�林
江景杰
朱浩
曾宪勇
陆飞鹏
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Everbright Envirotech China Ltd
Everbright Environmental Protection Research Institute Nanjing Co Ltd
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Everbright Envirotech China Ltd
Everbright Environmental Protection Research Institute Nanjing Co Ltd
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Abstract

The utility model provides a landfill leachate treatment device, include: the membrane bioreactor is used for biologically denitrifying the percolate and removing macromolecular organic matters and suspended matters in the percolate; the sedimentation reaction tank is used for carrying out sedimentation reaction on the percolate treated by the membrane biological processor so as to reduce the hardness of the percolate; the ultrafiltration membrane treatment system is used for removing precipitates in the percolate after the precipitation reaction is carried out in the precipitation reaction tank; and the reverse osmosis treatment device is used for performing reverse osmosis treatment on the percolate treated by the ultrafiltration membrane treatment system to obtain drainage. According to the utility model discloses a landfill leachate treatment device uses milipore filter processing system to replace microfiltration membrane processing system, and milipore filter processing system uses extensively in engineering application, and simple process, easy and simple to handle, operational environment are good, make original system more optimize.

Description

Landfill leachate treatment device
Technical Field
The utility model relates to a refuse treatment field particularly relates to a landfill leachate treatment device.
Background
The landfill leachate has strong stink and is harmful to human bodies, so that people can have symptoms of nausea, hematuria, dizziness and the like, if the landfill leachate is not properly treated, the pollution to the surrounding water environment is easily caused, the health of residents is threatened, and severe environmental protection and social events are also generated.
The primary leachate is not fermented and has good biodegradability, a combined process of 'pretreatment + anaerobism + MBR + NF/TUF + RO' is basically adopted, the effluent of the leachate can stably reach the circulating cooling water supplementing standard in the first-level A standard or the recycling standard, and the treatment process is relatively mature. The percolate of the landfill has high content of refractory organic matters, low BOD/COD value and poor biodegradability, has seriously imbalanced nutrition ratio (C: N: P), and is more difficult to treat as the time of the landfill body is prolonged. At present, besides leachate recirculation, organic fertilizer preparation and other processes, the landfill leachate treatment process basically adopts a combined process of pretreatment, anaerobic treatment, aeration biological treatment, oxidation treatment, advanced treatment and the like, and generated concentrated water is recirculated. The landfill leachate treatment process system has low effluent quality requirement and low system recovery rate, and cannot meet the increasingly strict national leachate quality discharge requirement. Meanwhile, the pollutants in the percolate cannot be discharged out of the system due to the recharging of the concentrated water, so that the percolate is more difficult to treat, and partial local governments have stipulated that treatment systems prohibit the back spraying of the percolate.
The utility model provides a landfill leachate and incineration power plant fresh leachate coprocessing, has realized the processing of landfill leachate high play water quality, high rate of recovery, but this system relies on domestic waste incineration power plant, has restricted the use of treatment process in the patent. In addition, when the quality of leachate in the landfill is poor, the effluent of the MBR contains a large amount of organic matters which are difficult to degrade, such as humic acid, and the like, and part of organic matters with larger particle size cause the problems of pollution and blockage of a micro-filtration membrane in a chemical softening system, flux reduction, frequent cleaning, and the like, so that the system can not stably reach the standard to output water.
Therefore, there is a need to provide a new landfill leachate treatment device to solve the problems of the prior art.
SUMMERY OF THE UTILITY MODEL
In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.
The utility model provides a landfill leachate treatment device, include:
the membrane bioreactor is used for biologically denitrifying the percolate and removing macromolecular organic matters and suspended matters in the percolate;
the precipitation reaction tank is used for carrying out precipitation reaction on the percolate treated by the membrane bioreactor so as to reduce the hardness of the percolate;
the ultrafiltration membrane treatment system is used for removing precipitates in the percolate after the precipitation reaction is carried out in the precipitation reaction tank; and
and the reverse osmosis treatment device is used for performing reverse osmosis treatment on the percolate treated by the ultrafiltration membrane treatment system to obtain drainage.
Illustratively, a pre-precipitation tank is further arranged between the precipitation reaction tank and the ultrafiltration membrane treatment system, and is used for performing precipitation treatment on the leachate treated by the precipitation reaction tank to precipitate suspended solids in the leachate.
Illustratively, the device also comprises a sludge tank connected with the pre-settling tank and used for collecting sludge precipitated in the pre-settling tank.
The sludge treatment system comprises a sludge tank, a dewatering machine and a sludge drying device, wherein the sludge tank is used for storing sludge, and the dewatering machine is used for dewatering the sludge in the sludge tank to obtain dried sludge and supernatant.
Illustratively, the sludge tank is also connected with the precipitation reaction tank, and the supernatant is input into the precipitation reaction tank to carry out precipitation reaction.
Illustratively, the device also comprises a precipitating agent adding device which is connected with the precipitation reaction tank and is used for adding a precipitating agent into the precipitation reaction tank, and the precipitating agent is mixed with the percolate to carry out a precipitation reaction.
Illustratively, the precipitating agent comprises calcium hydroxide.
Illustratively, the system further comprises a water production tank arranged between the ultrafiltration membrane treatment system and the reverse osmosis treatment device and used for collecting percolate discharged by the ultrafiltration membrane treatment system.
Illustratively, a pH adjuster supply is included for adding a pH adjuster to the percolate to adjust the pH prior to its introduction into the reverse osmosis treatment unit.
Illustratively, the PH adjusting agent includes hydrochloric acid.
According to the utility model discloses a landfill leachate treatment device, through Membrane Bioreactor (MBR) later filtration liquid of handling, enter ultrafiltration membrane processing system behind the sedimentation reaction tank, sediment and wherein some macromolecule difficult degradation organic matters in the interception sedimentation reaction, adopt the milipore filter to replace the microfiltration membrane in the traditional application of chemical softening system, membrane is dirty stifled after having solved chemical sedimentation, flux descends and frequently washs the scheduling problem, realize the stable high water quality of water and the high water yield of system, make original system stabilize out water, membrane system is dirty stifled, flux descends and frequently washs the scheduling problem. The utility model discloses use milipore filter processing system to replace microfiltration membrane processing system, milipore filter processing system uses extensively in engineering application, and simple process, easy and simple to handle, operational environment are good, make original system more optimize.
Drawings
The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions of the invention, which are used to explain the principles of the invention.
In the drawings:
fig. 1 is a schematic structural diagram of a landfill leachate treatment apparatus according to an embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
In order to thoroughly understand the present invention, a detailed description will be provided in the following description to explain the landfill leachate treatment apparatus of the present invention. It is apparent that the practice of the invention is not limited to the specific details familiar to those skilled in the art of waste treatment. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to these detailed descriptions.
It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same elements are denoted by the same reference numerals, and thus the description thereof will be omitted.
In order to solve the problems in the prior art, the utility model provides a landfill leachate treatment device, include:
the membrane bioreactor is used for biologically denitrifying the percolate and removing macromolecular organic matters and suspended matters in the percolate;
the sedimentation reaction tank is used for carrying out sedimentation reaction on the percolate treated by the membrane biological processor so as to reduce the hardness of the percolate;
the ultrafiltration membrane treatment system is used for removing precipitates in the percolate after the precipitation reaction is carried out in the precipitation tank; and
and the reverse osmosis treatment device is used for performing reverse osmosis treatment on the percolate treated by the ultrafiltration membrane treatment system to obtain drainage.
The landfill leachate treatment device of the present invention is schematically illustrated below with reference to fig. 1, wherein fig. 1 is a schematic structural diagram of a landfill leachate treatment device according to an embodiment of the present invention.
The landfill leachate mainly comes from natural rainfall, self-contained water in domestic garbage, liquid generated by thermal decomposition of waste in a landfill, and the like, and liquid generated by gravity flow generated in a landfill body and soaking in garbage. The quality of leachate in the landfill generally has the following characteristics: macromolecules and difficultly degraded COD are high; ammonia nitrogen and total nitrogen are high, and the proportion of carbon and nitrogen is not regulated; the total hardness and the total alkalinity are higher; the total solid solubility is high, the chloride ion and the sulfate radical are relatively high, and the scaling tendency is large.
Referring to fig. 1, the landfill leachate treatment device according to the utility model comprises a membrane bioreactor 1.
In an example according to the present invention, the landfill leachate is first treated by the pretreatment system and the anaerobic biological processor, and then enters the membrane bioreactor 1 for nitrification/denitrification treatment.
Illustratively, the pretreatment system consists of a mechanical filter, a settling tank, and a conditioning tank. The leachate of a domestic waste incineration plant, the leachate of a refuse landfill and the organic wastewater of kitchen waste enter a vertical flow type sedimentation tank after larger floaters, fibrous substances and solid particles are removed by a self-cleaning basket filter. The sedimentation tank utilizes the gravity sedimentation principle to precipitate and separate a large amount of suspended matters and colloidal substances contained in the leachate and the kitchen wastewater, thereby reducing the treatment load of subsequent structures. Supernatant in the sedimentation tank overflows to the regulating tank, and sludge deposited at the bottom of the mud bucket is periodically discharged to a sludge concentration tank by a slurry pump.
Because the leachate incoming water is in a peak and valley uneven state, the leachate treatment system needs to be provided with a regulating reservoir with a certain volume so as to relieve the impact load brought to the subsequent treatment system by the uneven incoming water, and the leachate incoming water is fully mixed and homogenized in the regulating reservoir, so that the biodegradability of the raw water is improved.
Illustratively, the anaerobic biological processor is configured as an internal-external circulation high efficiency anaerobic reactor (IOC). In which the microorganisms are present in the form of granulated sludge, the biomass increases significantly; because the water distribution is uniform and the ascending flow rate is high, the sludge is in a suspension and expansion state, the contact probability of the sewage and the microorganisms is greatly increased, and the treatment efficiency is obviously improved; has the characteristics of high methane production rate, low organic matter in effluent, good effluent quality and the like. Meanwhile, the reactor adopts medium-temperature anaerobic treatment, in order to maintain the temperature of the reactor required by the system when the temperature is low in winter, a heating system is required to be arranged before the leachate enters the anaerobic system, and heat preservation measures are taken into consideration when the anaerobic reactor is designed.
The nitrification/denitrification treatment is performed in the membrane bioreactor 1. Anaerobic produced water produced by the anaerobic biological processor automatically flows into the nitrification/denitrification system. The aeration system is adopted to add enough oxygen into anaerobic produced water, so that aerobic bacteria can have enough oxygen to utilize organic matters in the water for metabolism, and pollutants in the water are changed into harmless inorganic matters such as carbon dioxide, water and the like. Anaerobic produced water firstly enters a denitrification tank for denitrification and denitrification, then enters a nitrification tank for nitrification reaction, and finally enters an ultrafiltration membrane system. The external membrane system ultrafiltration membrane realizes sludge-water separation of a biochemical treatment system, intercepts sludge, improves the concentration of microorganisms and improves the removal efficiency of the reactor.
With continued reference to fig. 1, the leachate treated by the membrane bioreactor 1 enters a precipitation reaction tank 2 for precipitation reaction. Illustratively, the precipitation reaction tank 2 is connected with a precipitating agent adding device for adding a precipitating agent into the precipitation reaction tank to be mixed with the percolate for precipitation reaction. Illustratively, the precipitating agent comprises calcium hydroxide. The calcium hydroxide and the leachate are mixed and then subjected to precipitation reaction, wherein metal ions such as calcium, magnesium and the like are subjected to precipitation reaction and precipitated. The upper layer liquid flows into the next processing device.
According to the utility model discloses, the filtration liquid after the sedimentation reaction handles is carried out through sedimentation reaction tank 2 gets into milipore filter processing system and carries out the ultrafiltration reaction and handle.
The ultrafiltration treatment system is used for selectively separating substances through a microporous structure on the surface of a membrane. When the liquid mixture flows through the membrane surface under a certain pressure, the small molecular solute permeates the membrane (called ultrafiltrate), and the macromolecular substance is intercepted, so that the concentration of the macromolecular substance in the stock solution is gradually increased (called concentrated solution), thereby realizing the purposes of separating, concentrating and purifying the large and small molecules.
According to the utility model discloses, handle later filtration liquid through Membrane Bioreactor (MBR), enter ultrafiltration membrane processing system behind the precipitation reaction pond, the sediment in the interception sedimentation reaction and partial macromolecule difficult degradation organic matter among them, adopt the milipore filter to replace the microfiltration membrane among the traditional application of chemical softening system, the membrane is dirty stifled after having solved chemical precipitation, flux descends and frequently washs the scheduling problem, realize the stable high play water quality of water of system and high water yield, make original system stabilize out water, it is dirty stifled to have solved membrane system, flux descends and frequently washs the scheduling problem. The utility model discloses use milipore filter processing system to replace microfiltration membrane processing system, milipore filter processing system uses extensively in engineering application, and simple process, easy and simple to handle, operational environment are good, make original system more optimize.
With continued reference to fig. 1, a pre-settling tank 3 is also illustratively provided between the sedimentation reaction tank 2 and the ultrafiltration membrane treatment system 5 for performing a sedimentation treatment on the leachate treated by the sedimentation reaction tank to filter out suspended solids therein.
The percolate automatically flows into the pre-settling tank 3 after the sedimentation reaction of the percolate in the sedimentation reaction tank 2. The pre-settling tank 3 is used for adjusting the working condition when the sludge concentration is not high, and intercepting a large amount of sludge when the sludge concentration is high so as to reduce the workload of the ultrafiltration membrane, maintain the membrane flux to a certain extent and prolong the cleaning period. Meanwhile, engineering practice shows that a certain amount of viscous sludge exists in the softened sludge, and the arrangement of the pre-settling tank can effectively remove the viscous sludge and improve the stability of the system.
In an example according to the present invention, the landfill leachate treatment apparatus further comprises a sludge tank 10 for collecting sludge in the preliminary sedimentation tank. The sludge collected by the sludge tank 10 is dehydrated by a dehydrator 11 to obtain dried sludge, the dried sludge can be further treated by burning and the like, the sludge is dehydrated by the dehydrator to obtain supernatant, and the supernatant is further input into a precipitation reaction tank 2 for precipitation reaction treatment.
With continued reference to fig. 1, in an example according to the present invention, the landfill leachate treatment apparatus further includes a circulation tank 4, leachate after sedimentation treatment through the pre-settling tank flows into the circulation tank 4 for constant temperature treatment, and the treated leachate is pumped to the ultrafiltration membrane treatment system 5 by a feed pump, so as to improve the treatment efficiency of the ultrafiltration membrane treatment system 5.
Continuing to refer to fig. 1, according to the utility model discloses a landfill leachate treatment plant still includes reverse osmosis treatment device 7 for to the leachate after the ultrafiltration membrane processing system is handled carries out reverse osmosis treatment in order to obtain the drainage.
The reverse osmosis system 7 has selective interception on ions and removes most of salt. The reverse osmosis membrane component can achieve a removal rate of various ions and COD over 95 percent, and the quality of the effluent water is stable and reaches the standard.
As shown in fig. 1, in an example according to the present invention, the leachate treated by the ultrafiltration membrane treatment system 5 first enters the product water tank 6 to be collected, and the PH is adjusted by the PH adjuster supplied by the PH adjuster supply device 9, so as to finally obtain the leachate treated by reverse osmosis. Since calcium ions in leachate can combine with carbonate to generate calcium carbonate precipitate under alkaline environment to cause damage to the reverse osmosis membrane, in order to avoid scaling of the reverse osmosis membrane, a PH regulator, illustratively hydrochloric acid, is added to adjust the PH of the leachate to acidity.
Illustratively, the leachate is also chemically softened prior to reverse osmosis treatment. Performing chemical softening treatment on the percolate in a chemical softening reaction tank, adding lime and a small amount of sodium hypochlorite into the reaction tank, stirring for reaction, and removing most of hardness and heavy metals; meanwhile, lime has certain adsorptivity and can remove a part of COD; sodium hypochlorite is a strong oxidant, reduces chroma, oxidizes part of COD, and can prevent microbial contamination of the system. The water containing the precipitate after the reaction overflows into a sedimentation tank, and the precipitate generated by the reaction is deposited at the bottom in the sedimentation tank. The cross-flow micro-filtration membrane utilizes micropores to separate out precipitates in the wastewater, and the precipitates are used for replacing the traditional sedimentation or clarification process, so that better effluent quality can be obtained. And the sludge concentrated by the sedimentation tank and the sludge generated by the filtration of the micro-filtration membrane both enter a centrifugal separator to re-concentrate the sludge.
According to the utility model discloses a landfill leachate treatment device, through Membrane Bioreactor (MBA) later filtration liquid of handling, enter ultrafiltration membrane processing system behind the sedimentation reaction pond, sediment and some macromolecule difficult degradation organic matters among the interception sedimentation reaction, adopt the milipore filter to replace the microfiltration membrane among the traditional application of chemical softening system, membrane is dirty stifled after having solved chemical precipitation, flux descends and frequently washs the scheduling problem, realize the stable high water quality of water and the high water yield of system, make original system stabilize out water, the dirty stifled of membrane system has been solved, flux descends and frequently washs the scheduling problem. The utility model discloses use milipore filter processing system to replace microfiltration membrane processing system, milipore filter processing system uses extensively in engineering application, and simple process, easy and simple to handle, operational environment are good, make original system more optimize.
The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A landfill leachate treatment plant, comprising:
the membrane bioreactor is used for biologically denitrifying the percolate and removing macromolecular organic matters and suspended matters in the percolate;
the precipitation reaction tank is used for carrying out precipitation reaction on the percolate treated by the membrane bioreactor so as to reduce the hardness of the percolate;
the ultrafiltration membrane treatment system is used for removing precipitates in the percolate after the precipitation reaction is carried out in the precipitation reaction tank; and
and the reverse osmosis treatment device is used for performing reverse osmosis treatment on the percolate treated by the ultrafiltration membrane treatment system to obtain drainage.
2. The landfill leachate treatment plant of claim 1, wherein a pre-settling tank is further provided between the sedimentation reaction tank and the ultrafiltration membrane treatment system for settling the leachate treated by the sedimentation reaction tank to settle suspended solids in the leachate.
3. The landfill leachate treatment plant of claim 2, further comprising a sludge tank connected to the pre-settling tank for collecting sludge settled in the pre-settling tank.
4. The landfill leachate treatment plant of claim 3, further comprising a dewatering machine for dewatering the sludge in the sludge basin to obtain dried sludge and supernatant.
5. The landfill leachate treatment plant of claim 4, wherein the sludge tank is further connected to the sedimentation reaction tank, and the supernatant is fed into the sedimentation reaction tank for a sedimentation reaction.
6. The landfill leachate treatment plant of claim 1, further comprising a precipitant addition device coupled to the precipitation reaction tank for adding a precipitant to the precipitation reaction tank, wherein the precipitant mixes with the leachate to cause a precipitation reaction.
7. The landfill leachate treatment plant of claim 6, wherein said precipitating agent comprises calcium hydroxide.
8. The landfill leachate treatment plant of claim 1, further comprising a product tank disposed between the ultrafiltration membrane treatment system and the reverse osmosis treatment unit for collecting leachate discharged by the ultrafiltration membrane treatment system.
9. The landfill leachate treatment plant of claim 8, further comprising a PH adjusting agent supply means for adding a PH adjusting agent to said leachate to adjust the PH prior to its introduction into said reverse osmosis treatment unit.
10. The landfill leachate treatment plant of claim 9, wherein said PH adjusting agent comprises hydrochloric acid.
CN201921580602.3U 2019-09-20 2019-09-20 Landfill leachate treatment device Active CN211445406U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112645502A (en) * 2021-01-11 2021-04-13 丁洪军 Zero release sewage filtration system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112645502A (en) * 2021-01-11 2021-04-13 丁洪军 Zero release sewage filtration system

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