CN114560604B - Urban refuse landfill leachate environment-friendly harmless treatment system based on ultraviolet oxidation - Google Patents
Urban refuse landfill leachate environment-friendly harmless treatment system based on ultraviolet oxidation Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C02F2209/42—Liquid level
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- C02F2305/026—Fenton's reagent
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- C02F2305/10—Photocatalysts
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Abstract
Municipal refuse landfill leachate environmental protection innocent treatment system based on ultraviolet oxidation relates to municipal refuse treatment system technical field, it is high to solve current municipal refuse landfill leachate treatment cost, the medicament that thoughtlessly congeals, the oxidant input volume is big, the low grade technique of utilization ratio is not enough, including the landfill, the sedimentation tank is collected to the leachate, regulation reaction tank and sedimentation tank, the top of regulation reaction tank is equipped with the dog-house, be equipped with automatic drop feed mechanism in the dog-house department of throwing, still be equipped with planet rabbling mechanism in the regulation reaction tank, the regulation reaction tank is connected through first water pump and ultraviolet catalytic oxidation effluent treatment plant and is depositd the tank. Adopt the accurate regulation of discontinuity ration to handle, wait to stir after abundant to carry out ultraviolet catalytic Fenton oxidation reaction through ultraviolet catalytic oxidation effluent treatment plant and get into the sedimentation tank, reduce landfill leachate treatment cost, advance environmental protection innocent treatment to landfill leachate accurate high-efficiently.
Description
Technical Field
The invention relates to the technical field of municipal refuse treatment systems, in particular to the improvement of all equipment for carrying out environment-friendly and harmless treatment on percolate formed in municipal refuse landfills.
Background
Landfill leachate is also called leachate, which is simply dirty water seeped from the landfill; in the process of landfill and stacking of household garbage, atmospheric precipitation falls on the garbage, the garbage has a large amount of moisture, organic substances in the garbage are biochemically decomposed due to the biochemical degradation effects of compaction, fermentation and the like to generate water, and the water is leached and dissolved in the garbage to form high-concentration organic wastewater which is the garbage leachate.
The landfill leachate has complex water quality, various pollutants and high concentration, contains various toxic and harmful inorganic matters and organic matters, and also contains non-chlorinated aromatic compounds such as naphthalene, phenanthrene and the like, chlorinated aromatic compounds, phosphoric acid vinegar, phenolic compounds, aniline compounds and the like which are difficult to biodegrade. The highest concentration values of CODcr and BOD5 in the landfill leachate can reach thousands to tens of thousands, and compared with urban sewage, the Chemical Oxygen Demand (COD) can reach hundreds of times higher than that of the urban sewage. The chromaticity of the landfill leachate is black brown, the landfill leachate has strong odor, and also contains toxic and harmful substances such as heavy metals and pathogenic microorganisms, if the seepage-proofing project of a landfill site is not well done or the collection and treatment of the leachate are improper, serious soil, water and underground water pollution can be caused, so the leachate can not be directly discharged into an urban sewage treatment pipeline without strict treatment and disposal.
The treatment of leachate from municipal landfill sites has been a very difficult problem in the design, operation and management of landfill sites. The properties of leachate vary considerably as many factors in the flow of liquid may affect the properties of the leachate, including physical, chemical and biological factors. Generally, the pH value is between 4 and 9, the COD is in the range of 2000 to 62000mg/L, the BOD5 is 60 to 45000mg/L, the concentration of heavy metal is basically consistent with that of heavy metal in municipal sewage, and the treatment of leachate is essential for the purpose of protecting the environment. The existing treatment methods of landfill leachate comprise a physical chemical method and a biological method. The physical and chemical methods mainly comprise various methods such as activated carbon adsorption, chemical precipitation, density separation, chemical oxidation, chemical reduction, ion exchange, membrane dialysis, gas stripping, wet oxidation and the like, and when the COD is 2000-4000 mg/L, the removal rate of the COD by the physical and chemical methods can reach 50-87%. Compared with biological treatment, the physicochemical treatment is not influenced by the change of water quality and water quantity, the water quality of the effluent is relatively stable, and the treatment effect is better particularly for the landfill leachate which has a low BOD5/COD ratio (0.07-0.20) and is difficult to biologically treat. But the physical and chemical method has higher treatment cost; biological methods are divided into aerobic biological treatment, anaerobic biological treatment and a combination of the two. The aerobic treatment comprises an activated sludge process, an aeration oxidation tank, an aerobic stabilization pond, a biological rotating disk, a trickling filter and the like. The anaerobic treatment comprises an upflow sludge bed, an anaerobic immobilized bioreactor, a mixing reactor and an anaerobic stabilization pond. Most of the complex contaminants are not available to the microorganisms and even toxic to them, so that conventional biological treatment methods often fail. The oxidation potential of hydroxyl free radical (OH) generated by the advanced oxidation method is as high as 2.8V, so that various organic matters in the wastewater can be almost oxidized, and organic pollutants in the wastewater are oxidized into CO2 and H2O, therefore, the advanced oxidation technology is applied to treat the wastewater difficult to biodegrade, and the method is widely popularized in the market.
The mature treatment technology of the nonbiodegradable wastewater adopts water diversion and finger treatment, improves the biodegradability of the wastewater through pretreatment, primarily removes pollutants, and combines biochemical treatment to reach the emission standard. The ultraviolet catalytic Fenton oxidation technology has the advantages of rapid reaction, high treatment efficiency and the like, and is widely used as a pretreatment technology for treating wastewater difficult to biodegrade in recent years; the actual application of the ultraviolet catalysis technology has not been completed, and the prior art has the problems that 1) in the front-end coagulating sedimentation treatment, the coagulating agent is unreasonable in type selection, and no method has a favorable effect on the catalytic oxidation reaction, so that the dosage is large; 2) the traditional box type and cabinet type reactors cannot be used for full-wave band ultraviolet catalytic oxidation, so that the ultraviolet utilization rate is low; 3) because the reaction speed is high and the retention time is short, the existing process often causes the residue of the oxidant to influence the subsequent process; 4) because the precipitate in the landfill leachate is easy to adhere to the transparent pipeline through which the garbage leachate flows, the ultraviolet light is prevented from penetrating, and the ultraviolet catalysis effect is influenced.
Disclosure of Invention
In summary, the invention aims to solve the technical deficiencies of high treatment cost, large input amount of coagulant and oxidant, low utilization rate and the like of the existing municipal refuse landfill leachate, and provides an environment-friendly and harmless treatment system for the municipal refuse landfill leachate based on ultraviolet oxidation.
In order to solve the technical problem provided by the invention, the technical scheme is as follows:
municipal refuse landfill leachate environmental protection innocent treatment system based on ultraviolet oxidation, processing system is equipped with the cistern including the landfill, the bottom of landfill, and the drainage end of cistern has leachate collection sedimentation tank, its characterized in that through the honeycomb duct connection: the pipe orifice of the guide pipe is arranged below the liquid level of the percolate collecting and settling tank, a partition plate is arranged in the percolate collecting and settling tank and divides the percolate collecting and settling tank into a main settling tank and an overflow tank, and the main settling tank and the overflow tank are communicated at the position below the liquid level of the percolate collecting and settling tank; the side wall of the overflow tank is provided with an overflow port, the corresponding position of the overflow port is provided with an adjusting reaction tank, a feeding port is arranged above the adjusting reaction tank, an automatic feeding and discharging mechanism is arranged at the feeding port, the adjusting reaction tank is also internally provided with a planetary stirring mechanism, and the adjusting reaction tank is also internally provided with a first water level sensing unit which is used for providing starting signals for the automatic feeding and discharging mechanism and the planetary stirring mechanism after the water level is detected to reach a preset height; the regulating reaction tank is connected with a sedimentation water storage tank through a first water pump and an ultraviolet catalytic oxidation wastewater treatment device; the planetary stirring mechanism comprises a ring gear which is fixedly arranged on the edge of the opening of the regulating reaction tank, a main mounting bracket which stretches over the opening of the regulating reaction tank is arranged above the ring gear, the lower part of the main mounting bracket is connected with a movable bracket through a hollow shaft, the lower part of the movable bracket is movably connected with at least two planetary gears which are meshed with the ring gear, a driving shaft is arranged in the hollow shaft, one end of the driving shaft is fixedly provided with a power gear, and the other end of the driving shaft is in transmission connection with a stirring motor; the power gear is meshed with each planetary gear to drive each planetary gear to rotate and revolve around the power gear, the lower side surface of each planetary gear is connected with at least one stirrer, and at least two stirring blades are fixedly connected below the movable support; the ultraviolet catalytic oxidation wastewater treatment device comprises a transparent spiral pipe, an ultraviolet generator is arranged in the center of the spiral section of the spiral pipe, and the spiral pipe is connected with a pipeline rubber ball cleaning device in parallel; the pipeline rubber ball cleaning device comprises a water inlet pipe, a water discharge pipe, a ball storage pipe, a cleaning rubber ball and a clean water pump; the water inlet end of the water inlet pipe is connected with the water outlet of the spiral pipe through a first three-way electromagnetic valve, a first one-way valve for one-way water inlet and ball inlet is arranged between the water inlet end and the water outlet end of the water inlet pipe, a clear water inlet is arranged on one side, located at the downstream of the first one-way valve, of the side wall of the water inlet pipe, the clear water inlet is connected with the clear water pump, a sewage discharge port is arranged on one side, located at the downstream of the clear water inlet, of the side wall of the water inlet pipe, a rubber ball filter screen is arranged on the sewage discharge port, the sewage discharge port is connected with the drain pipe, and a drain electromagnetic valve is arranged on the drain pipe; the water outlet end of the water inlet pipe is connected with the water inlet end of the ball storage pipe, the water outlet end of the ball storage pipe is provided with a ball blocking net, and the outside of the ball storage pipe is provided with a ball blocking control motor for controlling the opening or closing of the ball blocking net; the water outlet end of the ball storage pipe is connected with the water inlet of the spiral pipe through a second three-way valve; and an electric ball filtering net for blocking the cleaning rubber balls discharged from the spiral pipe from being discharged from the outlet is also arranged in the first three-way electromagnetic valve.
The technical scheme for further limiting the invention comprises the following steps:
the automatic feeding mechanism comprises a storage hopper, a discharging screw propulsion mechanism is arranged at the bottom of the storage hopper, a discharging port corresponding to the discharging screw propulsion mechanism is arranged on the side wall of the storage hopper, an elastic closing door is arranged at the discharging port, a magnet is arranged on the elastic closing door, a Hall switch corresponding to the magnet is arranged on the side wall of the storage hopper, and the Hall switch is connected and controlled to be arranged on the inclined plane of the outer wall of the storage hopper and is provided with a vibrating motor.
The leachate collecting and settling tank is provided with a sealing cover, the top of the leachate collecting and settling tank is provided with a biogas collecting pipe, the biogas collecting pipe is connected with a biogas generator, and the biogas generator provides working electric energy for the planetary stirring mechanism and the ultraviolet catalytic oxidation wastewater treatment device.
The movable support is a cross support, two planetary gears and two stirring blades are movably connected below the movable support, and the two planetary gears are movably connected to two ends of one support frame of the movable support through shafts; two stirring blades are vertically and fixedly connected with two ends of the other supporting frame of the movable bracket.
The two stirring blades have opposite inclination angles, in the rotating process of the movable support, one stirring blade stirs the liquid on the tank wall of the regulation reaction tank to the center, and the other stirring blade stirs the liquid on the center of the regulation reaction tank to the tank wall.
The discharging screw rod propelling mechanism comprises a discharging motor, a screw rod and a screw rod shaft sleeve; in the screw shaft cover was located to the screw rod, ejection of compact motor drive screw rod was rotatory, was equipped with the feed inlet on the screw shaft cover, and the other end that the screw shaft cover is relative with ejection of compact motor is the discharge end, and the discharge end corresponds with the discharge gate of storage hopper.
The cleaning rubber ball comprises a rubber ball body with the diameter smaller than that of the pipe orifice of the spiral pipe, and bristles are uniformly implanted on the rubber ball body.
The water outlet end of the ball storage pipe is provided with a ball blocking net.
The second three-way valve is a three-way valve which is opened in a one-way mode in the inlet direction.
And a filter screen motor for driving the electric filter ball screen to turn and pack the electric filter ball screen to the water inlet end of the water inlet pipe is arranged outside the first three-way electromagnetic valve.
The invention has the beneficial effects that: the adjusting reaction tank adopts discontinuous quantitative accurate adjustment treatment, after a first water level sensing unit in the adjusting reaction tank detects that the water level reaches a preset height, an automatic feeding and discharging mechanism starts to feed adjusting reagents such as coagulating agent, oxidant and the like in a quantitative mode, then a planetary stirring mechanism starts to stir in an all-dimensional mode, after the stirring is sufficient, under the action of a first water pump, garbage percolate after adjustment treatment enters a precipitation water storage tank for storage after being subjected to ultraviolet catalytic Fenton oxidation reaction through an ultraviolet catalytic oxidation wastewater treatment device, and can be used as greening water or discharged in an overflowing mode, the treatment cost of the garbage landfill percolate is reduced, and the garbage landfill percolate is subjected to environment-friendly and harmless treatment accurately and efficiently.
Drawings
FIG. 1 is a schematic block diagram of the system of the present invention;
FIG. 2 is a schematic perspective view of the planetary stirring mechanism of the present invention;
FIG. 3 is an exploded view of the planetary stirring mechanism of the present invention;
FIG. 4 is a schematic bottom structure view of the planetary stirring mechanism of the present invention;
FIG. 5 is a schematic bottom view of the planetary stirring mechanism of the present invention;
FIG. 6 is a schematic structural view of an apparatus for treating wastewater by ultraviolet catalytic oxidation according to the present invention.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and preferred embodiments of the present invention.
Referring to fig. 1, the invention discloses an environment-friendly and harmless treatment system for percolate in an urban refuse landfill based on ultraviolet oxidation, which comprises a refuse landfill, wherein a liquid guide tank is arranged at the bottom of the refuse landfill, and the drainage end of the liquid guide tank is connected with a percolate collecting and settling pond 2 through a guide pipe 1; the landfill site is generally built between the mountain, and is built according to the mountain shape, and the bottom is prevented permeating and is passed through the processing, in order to in time to derive the filtration liquid from the landfill site bottom and collect the processing, avoids permeating the underground, and the liquid guide groove is located the bottom low-lying department of landfill site, and filtration liquid collection sedimentation tank 2 locates under the mountain, leads to the filtration liquid through honeycomb duct 1 and collects the sedimentation processing in leading-in filtration liquid collection sedimentation tank 2.
In order to avoid the odor in the percolate collecting and settling tank 2 from being emitted into the air, a sealing cover is arranged on the percolate collecting and settling tank 2, and the pipe orifice of the flow guide pipe is arranged at a position below the liquid level of the percolate collecting and settling tank; the top of the percolate collecting and settling tank is provided with a biogas collecting pipe which is connected with a biogas generator, biogas is converted into electric energy by the biogas generator to be output, and the electric energy can be directly used for supplying power for subsequent electrical equipment of the system, and can also be stored in a rechargeable battery to supply power for the subsequent electrical equipment of the system.
A separation plate 3 is arranged in the percolate collecting and settling tank 2, the percolate collecting and settling tank is separated into a main settling tank 21 and an overflow tank 22 by the separation plate, and the main settling tank 21 and the overflow tank 22 are communicated at the position below the liquid level of the percolate collecting and settling tank; an overflow port 221 is formed in the side wall of the overflow tank 22, an adjusting reaction tank 4 is arranged at a position corresponding to the overflow port 221, a feed port is formed above the adjusting reaction tank, an automatic feeding and discharging mechanism 5 is arranged at the feed port, a planetary stirring mechanism is further arranged in the adjusting reaction tank 4, and a first water level sensing unit 41 is further arranged in the adjusting reaction tank 4; after a first water level sensing unit 41 in the regulation reaction tank 4 detects that the water level reaches a preset height, the automatic feeding and discharging mechanism 5 starts to quantitatively feed regulating reagents such as coagulating agent, oxidant and the like, and then the planetary stirring mechanism starts to stir in all directions; the regulating reaction tank 4 is connected with a sedimentation water storage tank 8 through a first water pump 6 and an ultraviolet catalytic oxidation wastewater treatment device 7.
Referring to fig. 2, adjusting agents such as coagulant, oxidizer and the like for adjusting the leachate can be poured into the automatic feeding and discharging mechanism 5 in advance; in order to ensure that the automatic feeding mechanism 5 can be fed in a quantitative manner successfully at each time, the automatic feeding mechanism 5 comprises a storage hopper, a discharging screw propulsion mechanism 51 is arranged at the bottom of the storage hopper, a discharging port corresponding to the discharging screw propulsion mechanism is arranged on the side wall of the storage hopper, an elastic closing door 52 is arranged at the discharging port, a magnet is arranged on the elastic closing door 52, a hall switch 53 corresponding to the magnet is arranged on the side wall of the storage hopper, and the hall switch 53 is connected and controlled to be arranged on a vibrating motor 54 on the inclined plane of the outer wall of the storage hopper. The discharging screw propelling mechanism comprises a discharging motor, a screw and a screw shaft sleeve; in the screw shaft cover was located to the screw rod, ejection of compact motor drive screw rod was rotatory, was equipped with the feed inlet on the screw shaft cover, and the other end that the screw shaft cover is relative with ejection of compact motor is the discharge end, and the discharge end corresponds with the discharge gate of storage hopper. The discharging screw propulsion mechanism is horizontally or obliquely arranged at the bottom of the storage hopper.
The feeding and discharging working process comprises the following steps: the discharging motor of the discharging screw propelling mechanism 51 is controlled by the control system to be powered on, the discharging motor drives the screw to rotate, and the material at the feeding port of the screw shaft sleeve is pushed out from the discharging end of the screw shaft sleeve under the propelling action of the screw, pushes the elastic closing door 52 to be opened, and falls into the regulating reaction tank 4 under the action of gravity. If the Hall switch 53 is not triggered within the preset time after the discharging motor is electrified, the elastic closing door 52 is not opened, the feeding fails, the control system controls the vibration motor 54 to vibrate, then the discharging screw propelling mechanism 51 is restarted to feed again, if the Hall switch 53 is not triggered, the material in the storage hopper is used up or the blockage fault occurs, the alarm is given out to remind, and the manual intervention is waited.
Referring to fig. 2 to 5, the planetary stirring mechanism comprises a ring gear 42 fixedly installed on the edge of the mouth of the regulation reaction tank, a main installation support 43 stretching over the mouth of the regulation reaction tank 4 is arranged above the ring gear 42, a movable support 44 is connected below the main installation support 43 through a hollow shaft, at least two planetary gears 45 meshed with the ring gear are movably connected below the movable support 44, a driving shaft 46 is arranged in the hollow shaft, one end of the driving shaft 46 is fixedly provided with a power gear 47, and the other end of the driving shaft is in transmission connection with a stirring motor 48; the power gear 47 is engaged with each of the planetary gears 45 in the same manner to drive each of the planetary gears 45 to rotate and revolve around the power gear 47, at least one stirrer 451 is connected to the lower surface of each of the planetary gears 45, and at least two stirring blades 441 are fixedly connected to the lower side of the movable carrier 44. The preferred scheme is as follows: the movable bracket 44 is a cross bracket, two planetary gears 45 and two stirring blades 441 are movably connected below the movable bracket 44, wherein the two planetary gears 45 are movably connected with two ends of one supporting frame of the movable bracket 44 through shafts; two stirring blades 441 are vertically and fixedly connected to two ends of the other supporting frame of the movable support, so that the balance of stress can be guaranteed, and the operation is stable. In order to realize a sufficient and omnibearing stirring effect, the two stirring blades 441 have opposite inclination angles, in the rotating process of the movable bracket, one stirring blade stirs liquid on the tank wall of the regulation reaction tank to the center, and the other stirring blade stirs liquid on the center of the regulation reaction tank to the direction of the tank wall.
Referring to fig. 6, the ultraviolet catalytic oxidation wastewater treatment device 7 comprises a transparent spiral pipe 71, an ultraviolet generator 72 is arranged at the center of the spiral section of the spiral pipe 71, and a pipe rubber ball cleaning device 73 is connected in parallel with the spiral pipe 71. The spiral pipe 71 and the ultraviolet generator 72 have the function of realizing that the percolate in the regulating reaction tank 4 enters the sedimentation water storage tank after undergoing the ultraviolet catalytic Fenton oxidation reaction; the pipe rubber ball cleaning device 73 is used for periodically cleaning the inner wall of the spiral pipe 71.
The pipeline rubber ball cleaning device comprises a water inlet pipe 731, a water outlet pipe 732, a ball storage pipe 733, a cleaning rubber ball 734 and a clean water pump 735; the water inlet end of the water inlet pipe 731 is connected with the water outlet of the spiral pipe 71 through a first three-way electromagnetic valve 711, a first one-way valve 7311 for one-way water inlet and ball inlet is arranged between the water inlet end and the water outlet end of the water inlet pipe 731, a clean water inlet 7312 is arranged on one side of the side wall of the water inlet pipe 731, which is located at the downstream side of the first one-way valve 7311, the clean water inlet 7312 is connected with the clean water pump 735, a sewage discharge port 7313 is arranged on one side of the side wall of the water inlet pipe 731, which is located at the downstream side of the clean water inlet 7312, the sewage discharge port 7313 is provided with a rubber ball filter screen, the sewage discharge port 7313 is connected with the drain pipe 732, and the drain pipe 732 is provided with a drain electromagnetic valve 7321; the water outlet end of the water inlet pipe 731 is connected with the water inlet end of the ball storage pipe 733, the water outlet end of the ball storage pipe is provided with a ball blocking net 7331 according to requirements, and the outside of the ball storage pipe 733 is provided with a ball blocking control motor for controlling the opening or closing of the ball blocking net; the water outlet end of the ball storage tube 733 is connected with the water inlet of the spiral tube 71 through a second three-way valve 712; the second three-way valve 712 is a three-way valve that is opened in one direction at the inlet, that is, the inlet can be opened in one direction under the action of the first water pump 6, and the water outlet end of the ball storage tube 733 is communicated with the spiral tube 71 in a normal state. An electric ball filter screen 7111 for blocking the cleaning rubber balls 734 discharged from the spiral pipe 71 from discharging from the outlet is also arranged in the first three-way electromagnetic valve 711. The cleaning rubber ball 734 comprises a rubber ball body with the diameter smaller than that of the opening of the spiral pipe, and bristles are uniformly implanted on the rubber ball body. The cleaning rubber ball 734 can flow through the spiral tube 71 under the action of water flow, and the inner wall of the spiral tube 71 is brushed during the flowing process.
The cleaning process of the spiral pipe 71 is as follows: the first three-way electromagnetic valve 711 is opened to form a three-way pipe state, the water discharge electromagnetic valve 7321 is closed, the ball blocking net 7331 is opened, the second three-way valve 712 is closed at one inlet end, so that the water outlet end of the ball storage pipe 733 is communicated with the water inlet of the spiral pipe 71, the clean water pump 735 is started, under the action of the clean water pump 735, clean water for cleaning the spiral pipe 71 enters the water inlet pipe 731 from the clean water inlet 7312, due to the existence of the first one-way valve 7311, water flow only can carry the cleaning rubber ball 734 to be discharged from the ball storage pipe 733 to enter the spiral pipe 71, the inner wall of the spiral pipe 71 is scrubbed, then the cleaning rubber ball 734 is filtered and intercepted by the electric ball filtering net 7111 to enter the water inlet pipe 731, and sewage for cleaning the inner wall of the spiral pipe 71 passes through the electric ball filtering net 7111 and is discharged from the outlet to the precipitation water storage tank 8, and the cleaning action is completed. After the clean water pump 735 is stopped, the first check valve 7311 loses the hydraulic pressure acting force, if the water inlet pipe 731 is in a vertical or inclined state, the cleaning rubber ball 734 can pass through the first check valve 7311 under the action of its own gravity, in order to improve the reliability of the present invention, in this embodiment, the cleaning rubber ball 734 is pushed to pass through the first check valve 7311 under the action of the first water pump 6, specifically implementing steps: the outlet end of the first three-way electromagnetic valve 711 is closed, the drainage electromagnetic valve 7321 is opened, so that the water flow discharged by the spiral pipe 71 can only enter the drainage pipe 732 through the first one-way valve 7311 and is discharged to the sedimentation water storage tank 8 through the drainage electromagnetic valve 7321, and due to the existence of the rubber ball filter screen arranged at the sewage discharge port 7313, the cleaning rubber ball 734 passing through the first one-way valve 7311 under the action of the water flow can only continue to move forward and return to the ball storage pipe 733 to wait for the next cleaning. In order to prevent the cleaning rubber balls 734 from flowing out of the ball storage tube 733 in a non-cleaning state, the ball blocking net 7331 may be controlled to be turned off as required. After the cleaning rubber ball 734 returns to the ball storage tube 733, in order to not affect the water outlet of the spiral tube 71, the first three-way solenoid valve 711 is opened to form a three-way pipe state, and a filter screen motor for driving the electric filter screen 7111 to turn over and retract to the water inlet end of the water inlet tube 731 is added outside the first three-way solenoid valve 711.
The electric energy required by the operation of the planetary stirring mechanism and the ultraviolet catalytic oxidation wastewater treatment device can be provided by an external power supply or a methane generator, so that the fully-automatic ultraviolet oxidation-based urban refuse landfill leachate environment-friendly and harmless treatment system capable of operating independently is realized, the labor maintenance cost is low, the treated leachate is stored in a precipitation water storage tank for later use and can be used as greening water for providing irrigation water for greening the surface of a landfill, or is discharged through overflow, the landfill leachate treatment cost is effectively reduced, and the landfill leachate is subjected to environment-friendly and harmless treatment accurately and efficiently.
Claims (9)
1. Municipal refuse landfill leachate environmental protection innocent treatment system based on ultraviolet oxidation, processing system is equipped with the cistern including the landfill, the bottom of landfill, and the drainage end of cistern has leachate collection sedimentation tank, its characterized in that through the honeycomb duct connection: the pipe orifice of the guide pipe is arranged below the liquid level of the percolate collecting and settling tank, a partition plate is arranged in the percolate collecting and settling tank and divides the percolate collecting and settling tank into a main settling tank and an overflow tank, and the main settling tank and the overflow tank are communicated at the position below the liquid level of the percolate collecting and settling tank; the side wall of the overflow tank is provided with an overflow port, the corresponding position of the overflow port is provided with an adjusting reaction tank, a feeding port is arranged above the adjusting reaction tank, an automatic feeding and discharging mechanism is arranged at the feeding port, the adjusting reaction tank is also internally provided with a planetary stirring mechanism, and the adjusting reaction tank is also internally provided with a first water level sensing unit which is used for providing starting signals for the automatic feeding and discharging mechanism and the planetary stirring mechanism after the water level is detected to reach a preset height; the regulating reaction tank is connected with a sedimentation water storage tank through a first water pump and an ultraviolet catalytic oxidation wastewater treatment device;
the planetary stirring mechanism comprises a ring gear which is fixedly arranged on the edge of the opening of the regulating reaction tank, a main mounting bracket which stretches over the opening of the regulating reaction tank is arranged above the ring gear, the lower part of the main mounting bracket is connected with a movable bracket through a hollow shaft, the lower part of the movable bracket is movably connected with at least two planetary gears which are meshed with the ring gear, a driving shaft is arranged in the hollow shaft, one end of the driving shaft is fixedly provided with a power gear, and the other end of the driving shaft is in transmission connection with a stirring motor; the power gear is meshed with each planetary gear to drive each planetary gear to rotate and revolve around the power gear, the lower side surface of each planetary gear is connected with at least one stirrer, and at least two stirring blades are fixedly connected below the movable support;
the ultraviolet catalytic oxidation wastewater treatment device comprises a transparent spiral pipe, an ultraviolet generator is arranged at the center of the spiral section of the spiral pipe, and the spiral pipe is connected with a pipeline rubber ball cleaning device in parallel; the pipeline rubber ball cleaning device comprises a water inlet pipe, a water drain pipe, a ball storage pipe, a cleaning rubber ball and a clean water pump; the water inlet end of the water inlet pipe is connected with the water outlet of the spiral pipe through a first three-way electromagnetic valve, a first one-way valve for one-way water inlet and ball inlet is arranged between the water inlet end and the water outlet end of the water inlet pipe, a clear water inlet is arranged on one side, located at the downstream of the first one-way valve, of the side wall of the water inlet pipe, the clear water inlet is connected with the clear water pump, a sewage discharge port is arranged on one side, located at the downstream of the clear water inlet, of the side wall of the water inlet pipe, the sewage discharge port is provided with a rubber ball filter screen, the sewage discharge port is connected with the drain pipe, and the drain pipe is provided with a drain electromagnetic valve; the water outlet end of the water inlet pipe is connected with the water inlet end of the ball storage pipe, the water outlet end of the ball storage pipe is provided with a ball blocking net, and the outside of the ball storage pipe is provided with a ball blocking control motor for controlling the opening or closing of the ball blocking net; the water outlet end of the ball storage pipe is connected with the water inlet of the spiral pipe through a second three-way valve; and an electric ball filtering net for blocking the cleaning rubber balls discharged from the spiral pipe from discharging from the outlet is also arranged in the first three-way electromagnetic valve.
2. The environment-friendly and harmless treatment system for percolate of urban refuse landfill based on ultraviolet oxidation as claimed in claim 1, characterized in that: the automatic feeding mechanism comprises a storage hopper, a discharging screw propulsion mechanism is arranged at the bottom of the storage hopper, a discharging port corresponding to the discharging screw propulsion mechanism is arranged on the side wall of the storage hopper, an elastic closing door is arranged at the discharging port, a magnet is arranged on the elastic closing door, a Hall switch corresponding to the magnet is arranged on the side wall of the storage hopper, and the Hall switch is connected and controlled to be arranged on the inclined plane of the outer wall of the storage hopper and is provided with a vibrating motor.
3. The municipal refuse landfill leachate environment-friendly and harmless treatment system based on ultraviolet oxidation according to claim 1, wherein: the leachate collecting and settling tank is provided with a sealing cover, the top of the leachate collecting and settling tank is provided with a biogas collecting pipe, the biogas collecting pipe is connected with a biogas generator, and the biogas generator provides working electric energy for the planetary stirring mechanism and the ultraviolet catalytic oxidation wastewater treatment device.
4. The environment-friendly and harmless treatment system for percolate of urban refuse landfill based on ultraviolet oxidation as claimed in claim 1, characterized in that: the movable bracket is a cross bracket, two planetary gears and two stirring blades are movably connected below the movable bracket, wherein the two planetary gears are movably connected to two ends of one supporting frame of the movable bracket through shafts; two stirring blades are vertically and fixedly connected with two ends of the other supporting frame of the movable bracket.
5. The environmentally friendly and harmless treatment system for percolate from municipal refuse landfill based on ultraviolet oxidation according to claim 4, characterized in that: the two stirring blades have opposite inclination angles, in the rotating process of the movable support, one stirring blade stirs the liquid on the tank wall of the regulating reaction tank to the center, and the other stirring blade stirs the liquid on the center of the regulating reaction tank to the direction of the tank wall.
6. The environment-friendly and harmless treatment system for percolate of urban refuse landfill based on ultraviolet oxidation as claimed in claim 2, characterized in that: the discharging screw rod propelling mechanism comprises a discharging motor, a screw rod and a screw rod shaft sleeve; in the screw shaft cover was located to the screw rod, ejection of compact motor drive screw rod was rotatory, was equipped with the feed inlet on the screw shaft cover, and the other end that the screw shaft cover is relative with ejection of compact motor is the discharge end, and the discharge end corresponds with the discharge gate of storage hopper.
7. The municipal refuse landfill leachate environment-friendly and harmless treatment system based on ultraviolet oxidation according to claim 1, wherein: the cleaning rubber ball comprises a rubber ball body with the diameter smaller than that of the pipe orifice of the spiral pipe, and bristles are uniformly implanted on the rubber ball body.
8. The municipal refuse landfill leachate environment-friendly and harmless treatment system based on ultraviolet oxidation according to claim 1, wherein: the second three-way valve is a three-way valve which is opened in a one-way mode in the inlet direction.
9. The municipal refuse landfill leachate environment-friendly and harmless treatment system based on ultraviolet oxidation according to claim 1, wherein: and a filter screen motor for driving the electric filter ball screen to turn and pack the electric filter ball screen to the water inlet end of the water inlet pipe is arranged outside the first three-way electromagnetic valve.
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