CN112390478A - Device for efficiently treating aged landfill leachate through biological membrane and electric flocculation - Google Patents

Device for efficiently treating aged landfill leachate through biological membrane and electric flocculation Download PDF

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Publication number
CN112390478A
CN112390478A CN202011573980.6A CN202011573980A CN112390478A CN 112390478 A CN112390478 A CN 112390478A CN 202011573980 A CN202011573980 A CN 202011573980A CN 112390478 A CN112390478 A CN 112390478A
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CN
China
Prior art keywords
shell
landfill leachate
anode
cathode
suspension ball
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011573980.6A
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Chinese (zh)
Inventor
潘学军
张辰
黄斌
何欢
者江云
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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Filing date
Publication date
Application filed by Kunming University of Science and Technology filed Critical Kunming University of Science and Technology
Priority to CN202011573980.6A priority Critical patent/CN112390478A/en
Publication of CN112390478A publication Critical patent/CN112390478A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/465Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/105Phosphorus compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06Contaminated groundwater or leachate
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a device for efficiently treating aged landfill leachate by using a biological membrane and electrocoagulation, which comprises a shell, a cathode, an anode, a suspension ball filler, a carrier and a magnet. The invention can simultaneously and efficiently carry out the processes of electrocoagulation, electro-flotation and microbial degradation, can effectively remove various pollutants which are difficult to treat, has the advantages of simple operation, long-time operation and convenient maintenance, solves the problems of low utilization efficiency of sacrificial electrodes, larger space between polar plates, higher energy consumption, low ammonia nitrogen removal efficiency and the like in a double-electrode electrocoagulation method, simultaneously solves the problems of pollutants which are difficult to treat by microorganisms and biomembrane pollution in a biomembrane method, and is particularly suitable for treating old garbage percolate.

Description

Device for efficiently treating aged landfill leachate through biological membrane and electric flocculation
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a device for efficiently treating aged landfill leachate by using a biological membrane and electric flocculation.
Background
The electric flocculation technology is that an aluminum anode is electrolyzed through an electrochemical process to generate an aluminum hydroxide coagulant, the particles are condensed into larger particles to be settled by eliminating/neutralizing the repulsive force of the particles in water, and meanwhile, a negative plate can generate tiny hydrogen bubbles to float flocs with poor settling performance on the surface of the liquid. The electrocoagulation technology combines the advantages of coagulation, flotation and electrochemistry simultaneously, is clean and environment-friendly, and is a water treatment technology with great potential.
The electrocoagulation is classified into a single-electrode mode and a double-electrode mode according to an arrangement mode of electrodes. The single electrode is at least one pair of anode and cathode plates, and each anode and cathode plate is connected with each other in an arrangement mode, and the combination of each anode and cathode of the arrangement mode is equivalent to a small electrolytic cell; the double-electrode mode is composed of a pair of driving electrodes directly connected with a power supply and a plurality of sacrificial electrodes which are not connected with each other, the sacrificial electrodes are respectively induced to be anode/cathode sides under the electric field of a cathode/anode plate, and corresponding sides respectively generate electrochemical reactions corresponding to the sacrificial electrodes. The double-electrode mode has the advantages of long service time of the driving electrode and better processing effect than the single-electrode mode, and has huge potential in practical application.
Ammonia nitrogen which cannot be treated by the electric flocculation is generally treated by a biological treatment, and a biological membrane method is a good treatment method. The biofilm method has the advantages of small sludge amount, long hydraulic retention time, long microbial generation time, strong pollution load resistance and the like, and is often used for treating pollutants with unstable inflow water quality or unstable flow. However, the surface of the biological membrane has the defect of membrane pollution caused by the generation alternation of microorganisms or the sedimentation of suspended matters in polluted water, so the periodic removal of the biological membrane pollution is the key for keeping the biological membrane normally running.
The old landfill leachate contains a large amount of organic pollutants which cannot be removed by electric flocculation and heavy metals which are difficult to degrade by microorganisms, so that the old landfill leachate is difficult to treat. Therefore, it is necessary to develop a treatment device suitable for the aged landfill leachate containing high-concentration ammonia nitrogen, organic matters difficult to biodegrade and heavy metals.
Disclosure of Invention
The invention aims to provide a device for efficiently treating aged landfill leachate by using a biological membrane and electric flocculation.
The invention aims to realize the purpose, and the device comprises a shell, a cathode, an anode, a suspension ball filler, a carrier and a magnet, wherein the shell is of a columnar structure, the top of the shell is provided with an exhaust and slag discharge port, the bottom of the shell is provided with a sludge discharge port, the sludge discharge port is provided with a valve, the lower part of the side surface of the shell is provided with a water inlet, the upper part of the side surface of the shell is provided with an overflow water outlet, the cathode is arranged at the upper part in the shell, the anode is arranged at the lower part in the shell, the suspension ball filler is arranged at the middle part in the shell, the carrier is arranged in the suspension ball filler.
Compared with the prior art, the invention has the following technical effects:
1. the invention can simultaneously and efficiently carry out the processes of electrocoagulation, electro-flotation and microbial degradation, can effectively remove various pollutants which are difficult to treat, has the advantages of simple operation, long-time operation and convenient maintenance, solves the problems of low utilization efficiency of sacrificial electrodes, larger space between polar plates, higher energy consumption, low ammonia nitrogen removal efficiency and the like in a double-electrode electrocoagulation method, simultaneously solves the problems of pollutants which are difficult to treat by microorganisms and biomembrane pollution in a biomembrane method, and is particularly suitable for treating old garbage percolate;
2. for electric flocculation, because the iron powder is adsorbed on the suspension ball filler in a powdery form, the iron powder has a large reaction specific surface area, more active flocculating agents can be generated in the same time, and the waste of the iron powder can be greatly reduced; meanwhile, hydrogen generated by the iron powder can effectively remove biofilm pollutants, so that the biofilm pollution is reduced;
3. for biological treatment, heavy metals which harm the growth of microorganisms and substances which are difficult to degrade by the microorganisms are removed by electric flocculation, so that the bioavailability is improved; meanwhile, the microorganisms consume substances which cannot be removed by electric flocculation, such as ammonia nitrogen, COD and the like; the interaction of the electric flocculation and the biological treatment greatly increases the types of the treated pollutants, and enlarges the application range of the device;
4. after the aged landfill leachate is treated by the device, the COD removal rate is over 80 percent, the ammonia nitrogen removal rate is over 90 percent, the turbidity and phosphate radical removal rate is over 99 percent, and the sulfide ion removal rate is over 99 percent, and because the iron powder used as the sacrificial anode has small particle size and large specific surface area, the speed of generating the active flocculant is high, and the active flocculant is not easily influenced by cathode passivation, the anode material is saved, the removal rate is high, compared with the traditional electric flocculation/electric microorganism technology, the sacrificial electrode material is saved by 90 percent, the application range is wider than that of the traditional technology, and the energy consumption for treating 1 ton of landfill leachate is only 15.2025 kW.h, which is far lower than that of the electrochemical treatment in the prior art.
Drawings
FIG. 1 is a schematic cross-sectional front view of the present invention;
FIG. 2 is a schematic diagram of a right-side cross-sectional structure of the present invention;
FIG. 3 is a schematic top view of the second housing;
FIG. 4 is a schematic top view of the chuck;
FIG. 5 is a schematic top view of the packing retainer;
in the figure: 1-a first shell, 2-a second shell, 3-a third shell, 4-a cathode, 5-an anode, 6-a suspension ball filler, 7-a carrier, 8-a magnet, 9-an exhaust deslagging port, 10-a sludge discharge port, 11-a water inlet, 12-an overflow water outlet, 13-a circulating water inlet, 14-a circulating water outlet, 15-a cathode slot, 16-an anode slot, 17-a clamping table and 18-a filler fixer.
Detailed Description
The invention is further described with reference to the accompanying drawings, but the invention is not limited in any way, and any alterations or substitutions based on the teaching of the invention are within the scope of the invention.
As shown in fig. 1 to 5, the invention includes a housing, a cathode 4, an anode 5, a suspension ball filler 6, a carrier 7, and a magnet 8, wherein the housing is of a columnar structure, an exhaust and slag discharge port 9 is formed at the top of the housing, a sludge discharge port 10 is formed at the bottom of the housing, a valve is arranged at the sludge discharge port 10, a water inlet 11 is formed at the lower part of the side surface of the housing, an overflow water outlet 12 is formed at the upper part of the side surface of the housing, the cathode 4 is arranged at the upper part of the housing, the anode 5 is arranged at the lower part of the housing, the suspension ball filler 6 is arranged at the middle part of the housing, the carrier 7 is arranged in the suspension ball filler 6, the magnet 8 is hermetically arranged in the carrier.
Preferably, the shell is composed of a first shell 1, a second shell 2 and a third shell 3 from top to bottom, the inner diameter of the first shell 1 is 10cm, the height of the first shell is 11cm, the second shell 2 comprises a working layer with the inner diameter of 10cm, the third shell 3 is of an upper cylindrical and lower hopper-shaped structure, the upper cylindrical is a settling zone, the lower hopper-shaped is a mud storage zone, the inner diameter of the settling zone cylindrical structure is 10cm, the upper diameter of the mud storage zone hopper-shaped structure is 10cm, the lower diameter of the mud storage zone hopper-shaped structure is 5cm, the first shell 1 and the second shell 2, the second shell and the third shell 3 are detachably connected through flanges, rubber pads can be installed among the flanges, the sealing performance is improved, and the flanges are fixed by 12 screws, the cathode 4 is positioned in the first shell 1, the overflow water outlet 12 is positioned on the side surface of the first shell 1, the anode 5 is positioned in the third shell 3, the water inlet 11 is positioned on the side surface of the third shell 3, and the suspension ball filler 6 is positioned in the second shell 2; the shell is composed of three sections of shells, and the split type detachable structure is convenient for detaching and maintaining the electrode.
The non-metal valve can be arranged at the communication part between the device and the outside, the suspension ball filler 6 can be polypropylene suspension ball filler with the diameter of 8cm, and the suspension ball filler is biological filler well known by the technical personnel in the field.
Preferably, the cathode 4 is located below the overflow water outlet 12, the anode 5 is located below the water inlet 11, and since the water inlet 11 is located above the anode 5, the inflowing water can blow away flocculated sediments on the cathode, so that the cathode is cleaned while the water is inflowing, and sediments affecting the electric flocculation effect are reduced.
Preferably, the cathode 4 is parallel to the overflow outlet 12, and the anode 5 is parallel to the inlet 11.
Preferably, the second shell 2 is of a double-layer structure, a heat-insulating interlayer is arranged between the two layers, the inner diameter of the heat-insulating interlayer is 14cm, the heat-insulating interlayer is not communicated with the working layer, a circulating water inlet 13 is formed in the lower part of one side of the heat-insulating interlayer, and a circulating water outlet 14 is formed in the upper part of the other side of the heat-insulating interlayer; the temperature of the second shell 2 is regulated and controlled by circulating water in and out of the heat-insulating interlayer, so that the reaction is facilitated.
Preferably, a cathode slot 15 is arranged on the side surface of the first shell 1, the cathode 4 is inserted into the first shell 1 through the cathode slot 15, an anode slot 16 is arranged on the side surface of the third shell 3, and the anode 5 is inserted into the third shell 3 through the anode slot 16; the slot type structure is convenient to disassemble and maintain.
Preferably, clamping platforms 17 are respectively arranged in the first shell 1, the top of the second shell 2 and the third shell 3, the cathode 4 is arranged on the clamping platform in the first shell 1, the anode 5 is arranged on the clamping platform in the third shell 3, a filler fixer 18 is arranged on the clamping platform of the second shell 2, and the filler fixer 18 is connected with the suspension ball filler 6 through a connecting rod or a connecting rope.
Preferably, the third housing 3 is provided with legs on the outside.
Preferably, the clamping table 17 is composed of two symmetrically arranged quarter rings, so that the electrode and the suspension ball filler can be stably fixed and are easy to replace.
Preferably, the filler fixer 18 is a mesh plate, and the mesh structure can be adapted to various connection modes, so that the suspended ball filler is more conveniently fixed.
Preferably, 3 suspension ball fillers 6 are sequentially connected through a connecting rod or a connecting rope from top to bottom, and the distance between every two adjacent suspension ball fillers 6 is 1-3 cm; the suspension ball fillers 6 which are longitudinally arranged can ensure the normal treatment of microorganisms and improve the electric flocculation effect.
Preferably, the cathode 4 is a graphite plate, the anode 5 is a titanium plate plated with ruthenium iridium coating, the carrier 7 is a strip-shaped graphite felt 2, the length of the graphite felt 2 is 12cm, the width of the graphite felt 2 is 3cm, and the magnet 8 is a neodymium iron boron magnet.
The working principle and the working process of the invention are as follows: before the suspension ball filler 6 adsorbs the iron powder, the suspension ball filler 6 is placed into an activated sludge aerobic tank for biofilm culturing of microorganisms, and the suspension ball filler can be loaded into the device for use after acclimation for 7-14 days; the current applied between the polar plates of the device should not be too large, preferably below 10 mA; old landfill leachate (initial COD is about 4000mg/L, ammonia nitrogen concentration is about 800mg/L, turbidity is 300NUT, phosphate radical concentration is 12.4mg/L, sulfur ion concentration is 10 mg/L) is sent into the shell through the water inlet 11 and enters the main reaction zone in the shell of the device from the vicinity of the anode 5, iron powder can enter the device along with the water inlet of the water inlet 11 and is adsorbed on the suspension ball filler 6 through magnetic force, and the iron powder can be also adsorbed on the suspension ball filler 6 in advance before water inlet; the electrified electrode in the electric flocculation process comprises a cathode 4, an anode 5 and iron powder adsorbed on the outer surface of a carrier 7, wherein the iron powder is used as a sacrificial anode, the anode 5 is oxidized to generate oxygen, the oxygen is supplied to microorganisms, and one side of iron powder particles close to the anode 5 is induced into a cathode in an electric field to generate hydrogen for blowing off membrane pollution sediments on the surface of the biological membrane of the suspension ball filler 6 and reducing membrane pollution; one side of the iron powder particles close to the cathode 4 is induced into an anode in an electric field to generate an iron active flocculant to participate in an electric flocculation reaction; microorganisms attached to the biofilm filler rapidly consume COD and ammonia nitrogen under electrical stimulation, and the cathode 4 generates hydrogen to accelerate air flotation; the purified water is discharged from the overflow water outlet 12; floating slag and gas of the air floatation are discharged from an exhaust and slag discharge port 9, and settled flocs are accumulated at the bottom of the shell and can be discharged through a sludge discharge port 10; in the treatment process, the sacrificial anode does not need to be replaced and can be added along with the inlet water according to the observation treatment effect.

Claims (10)

1. The utility model provides a device of old landfill leachate of biomembrane and electric flocculation high efficiency processing, its characterized in that includes casing, negative pole (4), positive pole (5), suspension ball filler (6), carrier (7), magnet (8), the casing is the columnar structure, and the casing top is equipped with exhaust scum outlet (9), and the casing bottom is equipped with mud discharging outlet (10), and mud discharging outlet (10) are equipped with the valve, and casing side lower part is equipped with water inlet (11), and casing side upper portion is equipped with overflow delivery port (12), upper portion in the casing is located in negative pole (4), positive pole (5) locate the lower part in the casing, suspension ball filler (6) locate the middle part in the casing, carrier (7) dress is in suspension ball filler (6), carrier (7) inner seal is provided with magnet (8), and suspension ball filler (6) adsorb there is the iron powder.
2. The device for treating old landfill leachate with high efficiency by using the biological membrane and the electric flocculation according to claim 1 is characterized in that the shell consists of a first shell (1), a second shell (2) and a third shell (3) from top to bottom, the third shell (3) is of a cylindrical upper part and a hopper-shaped lower part, the first shell (1) and the second shell (2) and the second shell (3) are detachably connected through flanges, the cathode (4) is positioned in the first shell (1), the overflow water outlet (12) is positioned on the side surface of the first shell (1), the anode (5) is positioned in the third shell (3), the water inlet (11) is positioned on the side surface of the third shell (3), and the suspension ball filler (6) is positioned in the second shell (2).
3. The device for the efficient treatment of old landfill leachate by biofilm and electrocoagulation according to claim 1 or 2, characterized in that the cathode (4) is located below the overflow outlet (12) and the anode (5) is located below the water inlet (11).
4. The device for the efficient treatment of the aged landfill leachate by the biological membrane and the electric flocculation according to claim 2, wherein the second shell (2) has a double-layer structure, a heat-insulating interlayer is arranged between the two layers, the lower part of one side of the heat-insulating interlayer is provided with a circulating water inlet (13), and the upper part of the other side of the heat-insulating interlayer is provided with a circulating water outlet (14).
5. The device for the efficient treatment of the old landfill leachate by the biological membrane and the electric flocculation according to claim 2, wherein the first shell (1) is provided with a cathode slot (15) on the side, the cathode (4) is inserted into the first shell (1) through the cathode slot (15), the third shell (3) is provided with an anode slot (16) on the side, and the anode (5) is inserted into the third shell (3) through the anode slot (16).
6. The device for the efficient treatment of the aged landfill leachate by the biofilm and the electrocoagulation according to claim 2, wherein clamping platforms (17) are respectively arranged in the first shell (1), the top part in the second shell (2) and the third shell (3), the cathode (4) is arranged on the clamping platform in the first shell (1), the anode (5) is arranged on the clamping platform in the third shell (3), the clamping platform of the second shell (2) is provided with a filler fixer (18), and the filler fixer (18) is connected with the floating ball filler (6) through a connecting rod or a connecting rope.
7. The device for the efficient treatment of old landfill leachate by biofilm and electrocoagulation according to claim 6, wherein the clamping platform (17) is composed of two symmetrically arranged quarter-circle rings.
8. The device for the efficient treatment of old landfill leachate by biofilm and electrocoagulation according to claim 6, wherein the filler holder (18) is a mesh plate.
9. The device for treating the aged landfill leachate with the biological membrane and the electric flocculation in the claim 1 is characterized in that the number of the suspension ball fillers (6) is 3, the suspension ball fillers are sequentially connected through a connecting rod or a connecting rope from top to bottom, and the distance between every two adjacent suspension ball fillers (6) is 1-3 cm.
10. The device for the biofilm and electroflocculation high efficiency treatment of old landfill leachate according to claim 1, characterized in that the cathode (4) is a graphite plate, the anode (5) is a titanium plate plated with ruthenium iridium coating, the carrier (7) is a strip graphite felt (2), and the magnet (8) is a neodymium iron boron magnet.
CN202011573980.6A 2020-12-28 2020-12-28 Device for efficiently treating aged landfill leachate through biological membrane and electric flocculation Pending CN112390478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011573980.6A CN112390478A (en) 2020-12-28 2020-12-28 Device for efficiently treating aged landfill leachate through biological membrane and electric flocculation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011573980.6A CN112390478A (en) 2020-12-28 2020-12-28 Device for efficiently treating aged landfill leachate through biological membrane and electric flocculation

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Publication Number Publication Date
CN112390478A true CN112390478A (en) 2021-02-23

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CN202011573980.6A Pending CN112390478A (en) 2020-12-28 2020-12-28 Device for efficiently treating aged landfill leachate through biological membrane and electric flocculation

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110980891A (en) * 2019-12-17 2020-04-10 昆明理工大学 Tower type electric flocculation water treatment device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110980891A (en) * 2019-12-17 2020-04-10 昆明理工大学 Tower type electric flocculation water treatment device

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