CN211255551U

CN211255551U - Landfill leachate treatment device

Info

Publication number: CN211255551U
Application number: CN201921597428.3U
Authority: CN
Inventors: 罗烈明; 罗秀斌; 罗文辉
Original assignee: FANGMING ENVIRONMENTAL PROTECTION TECHNOLOGY (ZHANGZHOU) CO LTD
Current assignee: FANGMING ENVIRONMENTAL PROTECTION TECHNOLOGY (ZHANGZHOU) CO LTD
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-08-14
Anticipated expiration: 2029-09-24

Abstract

The utility model discloses a landfill leachate treatment device, which comprises a treatment system, wherein the treatment system comprises an electric flocculation system, an electric reduction system, an electric catalytic oxidation system and a filter membrane system; the combination of electrochemical flocculation, electrooxidation and electroreduction is formed to thoroughly degrade the garbage leachate, the garbage leachate or concentrated water generated by other process treatment, heavy metals and other substances are reacted into flocculated substances to precipitate and press slag to be removed, organic substances are oxidized and reduced into harmless substances such as N2, CO2, H2, H2O and the like to return to the nature, and the harmless substances are thoroughly degraded and cannot be accumulated in a treatment system, so that the system cannot be collapsed.

Description

Landfill leachate treatment device

Technical Field

The utility model relates to an environmental protection equipment especially relates to a landfill leachate processing apparatus.

Background

Garbage disposal is the first major thing in the world today, and the garbage disposal amount increases year by year along with the progress of urbanization. No matter how strict means such as garbage classification recycling and reutilization are adopted, the proportion of unrecoverable and wet garbage to the total garbage amount is still very high, and garbage leachate is generated in the processes of temporary storage, transfer, transportation and treatment of the garbage, particularly huge amount of leachate is generated in a garbage landfill, the garbage leachate is extremely serious in pollution, and the leachate contains heavy metals, organic matters, high nitrogen, high ammonia nitrogen, high chemical oxygen demand, high biochemical substances and the like. The conventional treatment method of the garbage leachate generally adopts a pretreatment system for pretreatment, wherein the pretreatment system comprises an anaerobic system (fermentation), an aerobic system, a facultative system or a biological membrane for effective degradation of a leachate stock solution, and then is combined with physical filtration methods such as sodium filtration, ultrafiltration and reverse osmosis for advanced treatment, and 20-40% of concentrated water generated by filtration is refluxed to the front end of the process or sprayed and refluxed to a garbage landfill for circular treatment. This recirculation of the reflux causes the accumulation of large amounts of non-biochemical pollutants in the re-exuded permeate, which further destabilizes the carbon-nitrogen ratio of the permeate and further deteriorates the biodegradability until the treatment system crashes. At present, similar phenomena occur in most of domestic garbage leachate treatment systems of garbage landfills, and the similar phenomena gradually appear, so that the peak period of emergency treatment is reached. Therefore, there is a need for a new process technique that does not produce secondary reflux or secondary pollution, and does not produce serious secondary pollution caused by landfill or incineration of concentrated water with other substances (such as cement, fly ash, clay, and the like).

SUMMERY OF THE UTILITY MODEL

The utility model provides a landfill leachate treatment device, it has overcome the not enough that the background art exists.

The utility model provides an adopted technical scheme of its technical problem is:

a landfill leachate treatment device comprises a treatment system, wherein the treatment system comprises an electric flocculation system, an electric reduction system, an electric catalytic oxidation system and a filter membrane system;

the electric flocculation system comprises a first container and an electric flocculation electrode unit, wherein the electric flocculation electrode unit is arranged on the first container and can be electrically connected with a power supply, and the electric flocculation electrode unit obtains electricity to reduce the chroma and the peculiar smell of the garbage percolate;

the electroreduction system comprises a second container and a reduction electrode unit, wherein the reduction electrode unit is immersed in water in the second container; the electroreduction electrode unit comprises a second positive electrode, a second negative electrode and an insulating and corrosion-resistant mesh, the second positive electrode comprises an electrode stack formed by stacking particles containing carbon materials, the second negative electrode is arranged in the mesh, the particle size and mesh size of the mesh meet the condition that the particles cannot enter the mesh, and the reduction electrode unit can be electrically connected with a power supply;

the electrocatalytic oxidation system comprises a third container and an oxidation electrode unit, wherein the oxidation electrode unit is assembled in the third container, and can be electrically connected with a power supply;

the first container, the second container, the third container and the filtering membrane system are sequentially communicated, and a concentrated water outlet of the filtering membrane system is communicated with the first container.

In one embodiment: and the physicochemical flocculation system also comprises a dosing system device which is matched with the physicochemical container so as to add at least one of a flocculating agent and an oxidant into the physicochemical container.

In one embodiment: the oxidation electrode unit comprises a plurality of third positive electrodes and a plurality of third negative electrodes which are arranged in a staggered mode in an equal number and uniform intervals.

In one embodiment: the particles comprise at least one of carbon or graphite particles; the second negative electrode adopts a stable electrode of iron, carbon, magnesium, copper, aluminum, nickel or titanium with the oxidized outer surface; the mesh fabric material is nylon, terylene or polyurethane fiber mesh fabric.

In one embodiment: the electric flocculation electrode unit comprises two electrode baskets made of insoluble metal materials, wherein meshes are formed in the electrode baskets, and the electrode baskets are used for containing electrode particles capable of being electrolyzed into electrode ions.

In one embodiment: the treatment system also comprises a curing device which is connected with the materialization container to cure the sediment of the materialization container to realize resource utilization.

In one embodiment: still include the collecting pit, processing system still includes pretreatment systems, pretreatment systems includes anaerobic system, good oxygen system, facultative system or biomembrane, collecting pit, pretreatment systems, first container, second container, third container and filtration membrane system switch on in proper order.

In one embodiment: the device also comprises a gas collecting hood and a gas treatment system, wherein the treatment system is arranged in the gas collecting hood, and the gas treatment system is connected with the gas collecting hood and the pretreatment system.

Compared with the background technology, the technical scheme has the following advantages:

the degradation system combines cheap anaerobic, aerobic and membrane physical filtration methods, and different combinations are made according to specific conditions, so that the problems of high treatment cost of the waste leachate, generation of concentrated water and other secondary pollution are well solved. The technical scheme is that the electrochemical flocculation, the electrooxidation and the electroreduction are combined to completely degrade the garbage leachate, the garbage leachate or concentrated water generated by other process treatment, heavy metals and other substances are reacted into flocculated substances to be precipitated and pressed to remove slag, organic substances are oxidized and reduced into N2, CO2, H2, H2O and other harmless substances to return to the nature, and the harmless substances are completely degraded and cannot be accumulated in a treatment system, so that the system cannot be collapsed.

Drawings

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Fig. 1 is a schematic structural diagram of a landfill leachate treatment device according to a specific embodiment.

Fig. 2 is a schematic structural diagram of an electrical reduction system according to an embodiment.

FIG. 3 is a schematic diagram of an electrocatalytic oxidation system in accordance with an embodiment.

Detailed Description

Referring to fig. 1, 2 and 3, a landfill leachate treatment apparatus includes a collection tank 1, a treatment system 2, a gas collecting hood 3 and a gas treatment system 4, wherein the treatment system includes a pretreatment system 21, an electric flocculation system 22, an electric reduction system 23, an electric catalytic oxidation system 24, a filtration membrane system 25 and a power supply 26.

The electric flocculation system 22 comprises a first container and an electric flocculation electrode unit, the electric flocculation electrode unit is arranged on the first container, and the power supply 26 is electrically connected with the electric flocculation electrode unit. According to the technical content of the electric flocculation system, as described in CN 201010563661, the electric flocculation electrode unit comprises two electrode baskets made of insoluble metal materials, wherein meshes are formed in the electrode baskets, and the electrode baskets are used for containing electrode particles capable of being electrolyzed into electrode ions. The two electrode baskets are electrically connected with a power supply, the electrode baskets of the electric flocculation electrode device obtain electric energy, OH ions are electrolyzed out in water, electrode particles are electrolyzed into the electrode ions, the OH ions and the electrodes are ionized to synthesize a flocculating agent, the flocculating agent and liquid are subjected to flocculation reaction to flocculate harmful substances in the garbage leachate into flocs, and then the flocs are precipitated for treatment so as to reduce the chromaticity and the peculiar smell of the garbage leachate.

The electric reduction system 23 includes a second container 231 and a reduction electrode unit, which is immersed in the water in the second container 231; the electroreduction electrode unit comprises a second positive electrode 232, a second negative electrode 233 and an insulating and corrosion-resistant mesh 234, wherein the second positive electrode 232 comprises an electrode stack formed by stacking particles containing a carbon material, the second negative electrode 233 is arranged in the mesh 234, and the particle size and mesh size of the mesh meet the condition that the particles cannot enter the mesh. The second positive electrode comprises an electrode stack formed by stacking particles of carbon materials, the particles are carbon particles or graphite particles, the electrode oxidation and reduction effects are good, and the nitrogen removal effect is better. The particles are cylinders, the diameter of each cylinder is 1-100 mm, the length of each cylinder is equal to the diameter of each cylinder, further, if 5-10 mm is selected, the structure is adopted, production and stacking are convenient, and the selection of the size is convenient for production and stacking and can generate a large surface area ratio. The second negative electrode is a stable electrode of iron, carbon, magnesium, copper, aluminum, nickel or titanium with the oxidized outer surface, and can be in a plate shape, a screen plate shape or other shapes. The mesh fabric material selects nylon, dacron or polyurethane fiber mesh fabric, the negative electrode is installed in the mesh fabric, just particle size and mesh size of the mesh fabric accord with the condition that the particles can not enter the mesh fabric. The second negative electrode is wrapped by the mesh cloth and inserted into the electrode stack, and through the design, the direct electrical connection of the two electrodes can be avoided, the number of particles can be increased, the redox effect is improved, and the nitrogen removal effect is improved. The power supply is electrically connected with the second positive electrode and the second negative electrode, the electrode unit is powered on, particles in the electrode stack are in a dotted semi-conductive state so that the particles form granular self-reaction electrodes, one end of each self-reaction electrode is a positive electrode, the other end of each self-reaction electrode is a negative electrode, one end of each self-reaction electrode is subjected to oxidation, the other end of each self-reaction electrode is subjected to reduction, the oxidation is used for carrying out electrocatalytic oxidative degradation on a nitrified compound in the landfill leachate, and then the reduction is used for reducing nitrogen elements in the landfill leachate into nitrogen gas, so that the nitrogen elements are removed from the landfill leachate and return. In this embodiment, since the particles (granular self-reacting electrodes) of the electrode stack have a large specific surface area, the micro-electrolysis reactor assembly with low voltage and low current is formed by the large specific surface area, one end of the electrode of the stack is oxidized, and the other end of the electrode of the stack is reduced, so as to form an electro-oxidation-reduction system with high efficiency and low energy consumption, thereby improving the efficiency of reducing nitrogen element into nitrogen gas. The positive and negative electrodes of the power supply 26 are electrically connected with the second positive electrode 232 and the second negative electrode 233 respectively.

The electrocatalytic oxidation system 24 includes a third container 241 and an oxidation electrode unit attached to the third container 241, and the oxidation electrode unit includes a plurality of third positive electrodes 242 and a plurality of third negative electrodes 243 which are arranged in an equal number and are uniformly spaced and staggered. Technical content as described in CN 201010563708: zeolite particles are added in the water in the third container 241 to be used as a third electrode; the oxidation electrode unit further comprises a positive conducting rod 244, a negative conducting rod 245, positive conduction aids 246 with the same number as the third positive electrode 242 and negative conduction aids 247 with the same number as the third negative electrode 243; each of the third positive electrode 242 and the third negative electrode 243 is provided with two through holes, and an insulating sleeve is sleeved in each through hole; the two insulating sleeves of the third positive electrode 242 and the third negative electrode 243 are respectively sleeved on the positive conducting rod and the negative conducting rod; the positive conduction aids are sleeved on the positive conducting rods in a conducting manner and are respectively in conducting and abutting joint with the first positive electrodes, and the negative conduction aids are sleeved on the negative conducting rods in a conducting manner and are respectively in conducting and abutting joint with the first negative electrodes; the power supply 26 is electrically connected to the positive and negative conductive posts.

The first container, the second container, the third container and the filtering membrane system are communicated in sequence. And physicochemical containers of a physicochemical flocculation system 27 are arranged between the first container and the second container, between the second container and the third container and between the third container and the filtering membrane system, and the physicochemical flocculation system also comprises a dosing system device which is matched with the physicochemical containers to add at least one of a flocculating agent and an oxidizing agent into the physicochemical containers, wherein the flocculating agent and the oxidizing agent are PAF (polymeric ferric silicate flocculating agent) or PAM (polyacrylamide). The chemical adding system device comprises a chemical adding container, wherein the chemical adding container is fixed relative to the physicochemical container and is positioned above the physicochemical container, a chemical outlet positioned right above the physicochemical container is formed in the bottom of the chemical adding container, a control valve is arranged at the chemical outlet, the control valve is an electromagnetic valve, the electronic control system is electrically connected with the electromagnetic valve to control the opening or closing of the chemical adding container so as to control the chemical adding, a water solution prepared from PAF (polymeric ferric silicate flocculant) and PAM (polyacrylamide) is added into garbage percolate, a compression double electric layer can be generated, suspended particles in the garbage percolate lose stability, the particles are mutually condensed to increase to form floccules and alumen ustum, and a large amount of suspended substances in the wastewater are removed through a bag filter after the floccules grow to a certain volume. The device also comprises a curing device 28 according to the requirement, and the curing device 28 is connected with the materialization container to cure the sediment of the materialization container to realize resource utilization. The solidification device comprises a sludge concentration place connected with the materialization container and a sludge filter press connected with the sludge concentration place; the upper clear liquid flowing from the surface layer of the materialization container flows into the next-stage electrochemical reaction core for degradation, and further flows through the next container after passing through the bag filter; pumping the precipitate from the physical and chemical container to a sludge concentration place, and concentrating and fully precipitating the precipitate in the sludge concentration place; the sludge filter press filters sludge taken out from the sludge concentration area, the sludge is pressed into a sludge cake, and sewage formed by filter pressing is communicated with the first container. The curing device 28 also includes a drying system for drying the mud cake.

The pretreatment system adopts the pretreatment in the prior art, and comprises an anaerobic system, an aerobic system, a facultative system or a biological membrane, and the collecting tank, the pretreatment system, the first container, the second container, the third container and the filtering membrane system are communicated in sequence.

In the treatment system, a plurality of the electric flocculation systems 22 can be arranged and connected in series in sequence; the electric reduction system 23 can be provided in a plurality of which are connected in series in sequence; the electrocatalytic oxidation system 24 can be provided in a plurality of, in series.

The garbage leachate passes through the pretreatment system 21, the electric flocculation system 22, the electric reduction system 23, the electric catalytic oxidation system 24 and the filtering membrane system 25 in sequence from the collecting tank 1, the purified water of the filtering membrane system 25 is discharged, and the concentrated water flows back to the first container. The container may be a sink or a pipe, etc.

The processing system is arranged in the gas collecting hood 3, the gas collecting hood 3 comprises a closed cavity, the processing system is arranged in the closed cavity, the top of the closed cavity is provided with a gas outlet, and a fan is arranged at the gas outlet. The gas treatment system is connected with the gas outlet of the gas collecting hood and comprises a treatment cavity, a spray nozzle is arranged at the top of the treatment cavity and used for spraying water downwards, one end of the treatment cavity is communicated with the gas outlet, and the gas is treated by spraying water and can be discharged after being treated. The bottom of the treatment cavity is provided with a water outlet which is communicated with the first container.

The waste leachate comprises leachate generated in the waste accumulation processes of waste storage, waste transfer, waste landfill and the like, and the leachate contains high total nitrogen of ammonia nitrogen and seriously imbalanced carbon-nitrogen ratio, and contains non-biochemical substances which are difficult to treat by a biochemical method. The embodiment can be widely applied to the treatment of harmless utilization of the leachate stock solution of the refuse landfill and the concentrated solution (concentrated water) generated after the refuse leachate is treated by other processes. In the embodiment, the degradation system combines cheap anaerobic, aerobic and membrane physical filtration methods, and different combinations are made according to specific conditions, so that the problems of high treatment cost of the waste leachate, generation of concentrated water and other secondary pollution are well solved. The embodiment forms a combination of electrochemical flocculation, electrooxidation and electroreduction to thoroughly degrade the garbage leachate, the garbage leachate or concentrated water generated by other process treatment, heavy metals and other substances are reacted into flocculated substances to precipitate and press slag to be removed, organic substances are oxidized and reduced into harmless substances such as N2, CO2, H2 and H2O to return to the nature, and the harmless substances are thoroughly degraded and cannot be accumulated in a treatment system, so that the system cannot be collapsed. The electric flocculation system carries out super-density oxidation and flocculation reaction on the garbage percolate to break macromolecular pollutants in the percolate and flocculate and precipitate heavy metals. The electro-reduction system reduces the nitrogen-containing substances in the leachate into nitrogen to return to the atmosphere. The electrocatalytic oxidation system deeply cracks the small molecular substances in the garbage leachate and further degrades the garbage leachate to the extent that the garbage leachate can enter a membrane treatment system or be directly treated to meet the discharge requirement.

The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims

1. The utility model provides a landfill leachate processing apparatus which characterized in that: comprises a treatment system, wherein the treatment system comprises an electric flocculation system, an electric reduction system, an electric catalytic oxidation system and a filter membrane system;

2. The landfill leachate treatment plant of claim 1, wherein: and the physicochemical flocculation system also comprises a dosing system device which is matched with the physicochemical container so as to add at least one of a flocculating agent and an oxidant into the physicochemical container.

3. The landfill leachate treatment plant of claim 1, wherein: the oxidation electrode unit comprises a plurality of third positive electrodes and a plurality of third negative electrodes which are arranged in a staggered mode in an equal number and uniform intervals.

4. The landfill leachate treatment plant of claim 1, wherein: the particles comprise at least one of carbon or graphite particles; the second negative electrode adopts a stable electrode of iron, carbon, magnesium, copper, aluminum, nickel or titanium with the oxidized outer surface; the mesh fabric material is nylon, terylene or polyurethane fiber mesh fabric.

5. The landfill leachate treatment plant of claim 1, wherein: the electric flocculation electrode unit comprises two electrode baskets made of insoluble metal materials, wherein meshes are formed in the electrode baskets, and the electrode baskets are used for containing electrode particles capable of being electrolyzed into electrode ions.

6. The landfill leachate treatment plant of claim 2, wherein: the treatment system also comprises a curing device which is connected with the materialization container to cure the sediment of the materialization container to realize resource utilization.

7. The landfill leachate treatment plant of claim 1, wherein: still include the collecting pit, processing system still includes pretreatment systems, pretreatment systems includes anaerobic system, good oxygen system, facultative system or biomembrane, collecting pit, pretreatment systems, first container, second container, third container and filtration membrane system switch on in proper order.

8. The landfill leachate treatment plant of claim 7, wherein: the device also comprises a gas collecting hood and a gas treatment system, wherein the treatment system is arranged in the gas collecting hood, and the gas treatment system is connected with the gas collecting hood and the pretreatment system.