CN209759231U - landfill leachate's processing apparatus - Google Patents

Abstract

The utility model discloses a landfill leachate's processing apparatus, it is carrying out biochemical jar microorganism metabolism to filtration liquid and is handled and carry out between the step of membrane processing, set gradually and transfer alkali, blow off, flocculation, deposit, first filter-pressing, the step of absorption and secondary filter-pressing, and be provided with hypochlorous acid and receive the step of degree of depth removal ammonia nitrogen after the step of carrying out membrane processing, can reduce membrane processing system's processing load by a wide margin, improve pollutants's treatment effect and efficiency, improve membrane processing system's life simultaneously. In addition, through organically combining each process step, leachate pollutants are effectively removed, meanwhile, the residence time of each process step is short, the occupied area is saved, the treatment efficiency is improved, the cost is reduced, the water body is finally discharged up to the standard, and an economic, effective and technically feasible garbage leachate treatment scheme is formed.

Description

Landfill leachate's processing apparatus

Technical Field

The utility model relates to a sewage treatment technical field, in particular to landfill leachate's processing apparatus.

background

In recent years, with the acceleration of the urbanization and industrialization process and the expansion of population in China, the generation amount of urban domestic garbage is increased sharply, the urban domestic garbage is increased at the speed of 8% ~ 10% every year, the daily garbage amount per capita exceeds 1.1kg, and the natural environment is seriously damaged.

At present, the technical methods for treating the landfill leachate are more, including a physical chemical method and a biological method, but the problems of overhigh construction, operation and management cost commonly exist in the existing treatment process technology found in actual construction or operation; on the other hand, the state also sets up a new landfill leachate standard GB16889-2008, and the existing landfill leachate treatment technology cannot meet the standard requirements and is discharged after reaching the standard. Taking a common percolate treatment method as an example at present, the method comprises treating some pollutants (mainly removing indexes such as COD (chemical oxygen demand) and ammonia nitrogen) in the percolate by the metabolism of microorganisms in a biochemical tank (or called biochemical pond) for about 10 days, then intercepting and separating the pollutants such as dissolved salts, colloids, microorganisms and organic matters by a membrane treatment system through a membrane separation system of the membrane treatment system to realize the treatment of the pollutants of the percolate to a certain extent, but treating the treatment efficiency of the corresponding pollutants of the percolate by the metabolism of the microorganisms (wherein the metabolism of the microorganisms takes about 10 days to reduce the indexes such as COD (chemical oxygen demand) and ammonia nitrogen as far as possible, otherwise, further aggravating the work load of the membrane treatment system) and the effect is relatively low, the primarily treated leachate flowing out of the water outlet pipe of the biochemical tank 1 still carries a large amount of pollutants such as ammonia nitrogen dissolved salts, colloids, microorganisms, organic matters and the like, exceeds the normal treatment load of a subsequent membrane treatment system, influences the treatment effect of pollutants of the leachate, and can cause serious corrosion and blockage to the membrane treatment system and reduce the service life of the membrane treatment system 8. Therefore, the search for a treatment scheme of 'effective technology, economy and feasibility' is the important importance of the landfill leachate treatment project in China, and is an important research and development subject to be solved urgently in the current stage of leachate treatment.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a landfill leachate's processing apparatus aims at improving the treatment effeciency and the quality of filtration liquid, saves area to reduce treatment cost.

In order to achieve the above object, the utility model provides a landfill leachate's processing apparatus, include:

The biochemical tank is internally provided with microbial strains and is used for carrying out microbial metabolism on the percolate to be treated input into the biochemical tank;

The water inlet end of the soda adjusting tank is communicated with the water outlet end of the biochemical tank through a pipeline and is used for stirring percolate treated by the biochemical tank and input into the biochemical tank and predetermined amount of lime added into the biochemical tank so that the pH value of the percolate reaches 11 ~ 12;

The water inlet end of the air stripping device is communicated with the water outlet end of the alkali adjusting tank through a pipeline, and the air stripping treatment is carried out on the percolate which is subjected to alkali adjusting treatment and is input into the air stripping device so as to greatly reduce the concentration of ammonia nitrogen in the percolate;

The water inlet end of the flocculation tank is communicated with the water outlet end of the air stripping device through a pipeline, so that pollutants in the leachate subjected to air stripping treatment and input into the flocculation tank can be subjected to flocculation reaction with ferrous sulfate solution and solid soda with preset content, which are added into the leachate, so that the hardness of the leachate is reduced, and the pH value of the leachate is adjusted to be neutral;

And the water inlet end of the high-density sedimentation tank is communicated with the water outlet end of the flocculation tank, so that flocculates in the landfill leachate are precipitated to form sludge, and supernatant flows out of the top end of the high-density sedimentation tank. B, carrying out the following steps of;

The water inlet end of the first plate-and-frame filter press is communicated with the sludge discharge end of the high-density sedimentation tank through a pipeline, and the water-containing sludge input into the first plate-and-frame filter press is subjected to primary filtration and squeezing to obtain a relatively clear water body;

The water inlet end of the carbon adding stirring tank is communicated with the water outlet end at the top end of the high-density sedimentation tank and the water outlet end of the first plate-and-frame filter press through pipelines, and the clear water body input into the carbon adding stirring tank and the powdered activated carbon added with a preset amount are stirred so as to adsorb most of residual COD, heavy metals and ammonia nitrogen in the clear water body through the powdered activated carbon and reduce the chroma and the odor;

the water inlet end of the second plate-and-frame filter press is communicated with the carbon adding stirring tank through a pipeline, and secondary filter pressing is carried out on the water body containing the powdered activated carbon input into the second plate-and-frame filter press to form clear water;

The water inlet end of the membrane treatment system is communicated with the water outlet end of the second plate-and-frame filter press through a pipeline, and the membrane treatment system is used for carrying out membrane filtration treatment on the clear water input into the membrane treatment system; and

And the water inlet end of the sodium hypochlorite stirring tank is communicated with the water outlet end of the multi-stage membrane system through a pipeline, and the clear water subjected to membrane filtration treatment and input reacts with sodium hypochlorite with a preset content added in the clear water so as to carry out deep removal treatment on the residual ammonia nitrogen.

the utility model discloses a technical scheme is between the step of carrying out biochemical jar microorganism metabolism effect processing and carrying out membrane processing system processing to the filtration liquid, set gradually and transfer the alkali to the filtration liquid, blow off, flocculation, deposit, first filter-pressing, adsorb and secondary filter-pressing, and set up the step of hypochlorous acid nanometer degree of depth removal ammonia nitrogen after the step of carrying out membrane processing, wherein, the pH value of filtration liquid reaches 11 ~ 12 in transferring the alkali jar, blow off the treatment and greatly reduce the ammonia nitrogen concentration in the filtration liquid in the blow off device to the filtration liquid, make the pollutant in the filtration liquid flocculate in the flocculation jar, thereby reduce the hardness of filtration liquid and adjust the pH of filtration liquid to neutral, flocculate in the filtration liquid in the sedimentation tank deposits, and flow out the supernatant, carry out primary filtration to the flocculation sediment that deposits in the plate and frame filter press, squeeze the filter press, obtain cleaner filtration liquid, add the powdered activated carbon of predetermined quantity and adsorb the remaining majority in cleaner water body, heavy metal, ammonia nitrogen, and reduce colourity and stink, carry out secondary filter-pressing to the water body, the saturated activated carbon filtration of the filtration system, the effective treatment efficiency of the filtration system is improved, thereby the effective treatment efficiency of the effective treatment of reducing the treated water body of the treated water body is reduced, the effective treatment of the treated by reducing the treated by the effective treatment of the treated water body of the treated by the effective treatment of the treated water body of the treated by the effective treatment of the treated water body of the effective treatment of the less water body of the effective.

Drawings

FIG. 1 is a schematic structural view of the garbage leachate treatment apparatus of the present invention;

FIG. 2 is a flow chart of a method for treating landfill leachate;

FIG. 3 is a front view of the biochemical tank;

FIG. 4 is a top view of the biochemical tank;

FIG. 5 is a cross-sectional view taken along A-A of FIG. 4;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 7 is a front view of the blow-off device;

FIG. 8 is a front view of the blow-off device in section;

FIG. 9 is a top view of the case taken away;

fig. 10 is an enlarged detail view of portion C of fig. 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

it should be noted that, if directional indicators (such as … …, upper, lower, left, right, front, back, top, bottom, inner, outer, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial) are involved in the embodiments of the present invention, the directional indicators are only used to explain the relative position, motion, etc. of the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In addition, if there is a description relating to "first" or "second", etc. in the embodiments of the present invention, the description of "first" or "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a landfill leachate's processing apparatus.

₄in the embodiment of the invention, as shown in figures 1 to 10, the treatment device for garbage leachate comprises a biochemical tank 1, an alkali adjusting tank 2, a blow-off device 3, a flocculation tank 4, a high-density sedimentation tank (not marked), a first plate-and-frame filter press 5, a carbon adding stirring tank 6, a second plate-and-frame filter press 7, a membrane treatment system 8 and a sodium hypochlorite stirring tank 9, wherein microbial strains are arranged in the biochemical tank 1 and used for carrying out microbial metabolism on leachate to be treated which is input into the biochemical tank, a water inlet end of the alkali adjusting tank 2 is communicated with a water outlet end of the biochemical tank 1 through a pipeline and used for carrying out blowing-off treatment on the leachate which is treated by the biochemical tank 1 and input into the biochemical tank and is added with a predetermined amount of lime so that the pH value of the leachate reaches 11 ~ 12, a water inlet end of the blow-off device 3 is communicated with a water outlet end of the alkali adjusting tank 2 through a pipeline and used for carrying out blowing-off treatment on the leachate which is treated by the alkali adjusting treatment and input into the tank through a standard flocculation filter press, wherein the leachate is treated by the sewage, the sewage and the sewage is treated by a sewage precipitating system, more deeply than the sewage adding activated sludge from the sewage and the sewage adding filter press, the sewage and the sewage adding filter, the sewage adding filter press, the sewage adding filter system is communicated with the sewage adding filter press, the sewage adding filter press filtering system is communicated with the sewage adding filter press, the sewage adding filter press filtering system is communicated with the sewage adding filter press, the sewage adding filter press filtering system, the sewage adding filter press, the sewage adding filter press filtering system is communicated with the sewage adding system, the sewage adding filter press, the sewage adding system is communicated with the sewage adding system, the sewage adding system is communicated with the sewage adding system, the sewage adding system.

it should be noted that, for the corresponding treatment processes of the biochemical tank 1, the alkali adjusting tank 2, the stripping device 3, the flocculation tank 4, the high-density sedimentation tank, the first plate-and-frame filter press 5, the carbon adding stirring tank 6, the second plate-and-frame filter press 7, the membrane treatment system 8, and the sodium hypochlorite stirring tank 9, reference is made to the above-mentioned embodiment of the treatment method for landfill leachate, and no further description is given here.

Specifically, the membrane treatment system 8 is a multistage membrane treatment system 8, and comprises an ultrafiltration system 81, a nanofiltration system 82 and a reverse osmosis system 83 which are connected in sequence, and after the clean water after secondary pressure filtration is filtered by the ultrafiltration system 81, the nanofiltration system 82 and the reverse osmosis system 83 in sequence, most of the pollutants remained in the clean water can be removed. Because in the process that the clear water is sequentially filtered by the ultrafiltration system 81, the nanofiltration system 82 and the reverse osmosis system 83, ultrafiltration concentrated water, nanofiltration concentrated water and reverse osmosis concentrated water are respectively generated, in order to realize zero concentrated water discharge, the utility model also needs to input the ultrafiltration concentrated water generated by the ultrafiltration system 81 into the carbon adding stirring tank 6 for powder activated carbon adsorption treatment; inputting nanofiltration concentrated water generated by a nanofiltration system 82 into a secondary carbon adding stirring tank 84, adding a predetermined amount of powdered activated carbon to adsorb residual COD, heavy metals and ammonia nitrogen in the nanofiltration concentrated water, reducing chroma and odor, and inputting the nanofiltration concentrated water into a second plate-and-frame filter press for filter pressing; and a process of inputting the reverse osmosis concentrated water generated by the reverse osmosis system 83 into the ultrafiltration system 81 for ultrafiltration. Namely, the water outlet end of the ultrafiltration concentrated water of the ultrafiltration system is communicated with the water inlet end of the carbon adding stirring tank through a pipeline, the water outlet end of the nanofiltration concentrated water of the nanofiltration system 82 is communicated with the water inlet end of the secondary carbon adding stirring tank 84 through a pipeline, the water outlet end of the secondary carbon adding stirring tank is communicated with the water inlet end of the second plate-and-frame filter press, and the water outlet end of the reverse osmosis concentrated water of the reverse osmosis system 83 is communicated with the water inlet end of the ultrafiltration system 81 through a pipeline.

further, the utility model discloses still include equalizing basin (unmarked), the play water end of equalizing basin leads to with biochemical jar 1's income water end through the pipeline, inputs the equalizing basin with pending filtration liquid to carry out quality of water and water regulation back, input biochemical jar 1 again.

The embodiment of the utility model provides an in, the filtration liquid to be handled carries out the biochemical jar 1's of microorganism metabolism effect quantity can be according to actual demand (for example, it is long when handling water yield, biological jar size and processing etc.), can be one, also can be a plurality of consecutive to the processing water yield of 2000 tons/day calculates, can adopt 72 consecutive biochemical jars 1, every biochemical jar 1's diameter is 3.5m, highly is 9 meters, the pH of filtration liquid to be handled is 8 ~ 9.

The biochemical tank 1 may have various embodiments, for example, the prior art may be adopted, or the following embodiments may also be adopted, as shown in fig. 3 to 6, the biochemical tank 1 includes a tank body 11, a containing space 110 for containing a penetrating fluid is formed in the tank body 11, an outer wall of the tank body 11 is provided with a water inlet 111 and a water outlet 112 communicated with the containing space 110, the water inlet 111 and the water outlet 112 are respectively connected with a water inlet pipe (not shown) and a water outlet pipe (not shown), the penetrating fluid to be treated enters the containing space 110 through the water inlet pipe and the water inlet 111, after most of pollutants such as COD, ammonia nitrogen and the like are treated and removed, the penetrating fluid flows out of the tank body 11 from the water outlet 112, the containing space 110 is provided with a biological zone 12 for microbial strains (such as nitrifying bacteria and not shown) to attach from top to bottom, so that the, forming a biochemical reaction film to improve the contact area of microorganisms and the percolate, thereby improving the treatment speed of the percolate and removing pollutants such as COD, ammonia nitrogen and the like in the percolate.

The bottom of the accommodating space 110 is provided with a plurality of aeration devices 13, the air outlet of the aeration devices 13 faces upwards, the air inlet (not shown) of the aeration devices 13 is connected with an air conveying device (such as an air pump, not shown) positioned outside the tank body 11 through an air pipe 4, when the tank works, the air conveying device conveys air into the accommodating space 110 through the air pipe 14, and finally, percolate is sprayed upwards from the air outlet of the aeration devices 13 so as to enrich oxygen to the microbial strains in the percolate, improve the growth and reproduction speed of the microbial strains and further improve the treatment speed of the percolate. Specifically, the aeration device 13 may be a shower-shaped aeration plate provided with an air inlet and an air outlet, or a cylinder provided with an air inlet and an air outlet. The air pipe 14 enters the accommodating space 110 from the top of the tank 1 and extends downward to be connected to an air inlet of the aeration device 13.

further, a switch valve 141 is disposed at a position of the air pipe 14 higher than the percolate liquid level 100 to control on and off of the air pipe 14, and the switch valve 141 is closed when aeration is not needed and opened when aeration is needed. Specifically, the switch valve 141 may be an electromagnetic switch valve or a manual switch valve.

specifically, a plurality of support frames 15 (as shown in fig. 5, three support frames are provided) are vertically installed in the accommodating space 110 at intervals, and a plurality of biological zones 12 are horizontally installed in each support frame 15 at intervals to attach a relatively large number of microbial strains, so as to further increase the treatment speed of the leachate. More specifically, each of the biological belts 12 may include two fabric belts, and the edges of the two fabric belts are sewn and fixed together to form a space which can be filled with microbial strains.

In the embodiment of the present invention, the water inlet 111 is located at a position where the outer wall of the tank 11 is higher than the water outlet 112, and is preferably located at a position where the outer wall of the tank 11 is close to the top wall of the tank 11. The water outlet 112 is disposed on the outer wall of the tank 11 near the bottom wall of the accommodating space 110.

Furthermore, a sludge discharge port 113 communicated with the accommodating space 110 is formed in a position, lower than the water outlet 112, of the outer wall of the tank body 11, the sludge discharge port 113 is connected with a water suction pump (not shown) through a sludge discharge pipe (not shown), and when the water suction pump works, sludge deposited at the bottom of the accommodating space 110 can be pumped out of the tank body 11, so that the water outlet 112 is prevented from being blocked by the sludge. Similarly, the mud pipe may be provided with a switch valve (not shown) to control the on/off of the mud pipe (not shown).

Further, a manhole 114 communicating with the accommodating space 110 is formed in an outer wall of the lower portion of the tank 11, a cover plate (not shown) capable of sealing the manhole 114 is detachably mounted (for example, detachably mounted by a screw), and when the accommodating space 110 and components therein (for example, the biological belt 12, the air pipe 14 and the aeration device 13) need to be cleaned or maintained, a cleaning or maintenance person can detach the cover plate and then enter the accommodating space 110 through the manhole 114 to perform corresponding cleaning or maintenance. Specifically, the manhole 114 should be set to facilitate the cleaning or maintenance personnel to smoothly enter the accommodating space 110, and should not be set too high, such as being set slightly higher than the water outlet 112.

In the embodiment of the present invention, as shown in fig. 7 to 10, the air-stripping device 3 comprises a plurality of rows of vertically stacked boxes 31, each row of a plurality of the boxes 31 is hollow to form a containing chamber 311, the containing chambers 311 of adjacent boxes 31 in the same row are communicated with each other through overflow holes or pipes, two of the boxes 31 at two sides of each row are respectively provided with a water inlet (not shown) and a water outlet (not shown) communicated with the containing chamber 311, and in two rows of boxes 31 adjacent to each other up and down, one row of the boxes 31 above the box 31 with the water outlet is vertically adjacent to one row of the boxes 31 below the box 31 with the water inlet, and the water outlet and the water inlet are connected through a water outlet connecting pipe 32, so that the percolate can flow from top to bottom in a circuitous manner between the vertically stacked boxes 31 in the plurality of rows, thereby providing a larger steam-water contact area and better mass transfer conditions, and ensuring that the flow of the, the foam generation is reduced; a plurality of aeration pipes 33 are arranged side by side at the bottom of the accommodating chamber 311 of each tank 31, the aeration pipes 33 are connected with an air conveying device (such as an air pump, not shown) positioned outside the tank 31 through an air inlet pipe 34, aeration holes 331 are formed in the peripheral wall of each aeration pipe 33, and exhaust holes (not shown) communicated with the accommodating chamber 311 are formed at positions of each tank 31 higher than the liquid level of percolate. During the work will, will be in the room 311 that holds that is located the top row of box 31 that is equipped with the inlet opening with the leachate after preliminary treatment, gas transmission device sends gas into aeration pipe 33 through intake pipe 34, and in the leachate of holding room 311 is got into from aeration hole 331, change the gas-liquid equilibrium relation that ammonia nitrogen gas held down the establishment in aqueous, make volatile ammonia nitrogen gas change into the gaseous phase by the liquid phase, rise and emerge along the leachate, then flow out the room 311 through the exhaust hole and collect the processing (for example through ammonia nitrogen absorption system absorption processing) or distribute to the atmosphere, ammonia nitrogen clearance reaches more than 80%, and the leachate through the blow-off processing is finally followed the lowest row of box 31 that is equipped with the inlet opening and is flowed out and subsequent processing.

specifically, the pipeline is provided with a first switch valve for controlling the on-off of the pipeline, the downpipe connecting pipe 32 is provided with a second switch valve for controlling the on-off of the downpipe connecting pipe, and when the percolate needs to be controlled to flow between the accommodating chambers 311 of the corresponding box bodies 31, the corresponding first switch valve and/or the corresponding second switch valve can be opened, and otherwise, the corresponding first switch valve and/or the corresponding second switch valve is closed. The first and second switching valves may be manual switching valves or electromagnetic switching valves.

Furthermore, a manhole 312 is provided at a position of the tank body 1 higher than the liquid level, a baffle 35 capable of sealing the manhole 312 is detachably mounted (for example, detachably mounted by a screw) at the manhole 312, and when the accommodation chamber 311 and components therein (for example, the aeration pipe 33) need to be cleaned or maintained, a cleaning or maintenance worker can detach the baffle 35 and then enter the accommodation chamber 311 through the manhole 312 to perform corresponding cleaning or maintenance. Specifically, the manhole 312 should be set to facilitate the cleaning or maintenance personnel to smoothly enter the accommodating chamber 311, and should not be set too high. Specifically, the baffle 35 may be made of a transparent material so that the condition in the accommodating chamber 311 can be observed through the transparent baffle 35. Of course, when the baffle 35 is made of a non-transparent material, the condition inside the accommodating chamber 311 can be observed by detaching the baffle 35. More specifically, the transparent material may be plastic, acrylic or toughened glass, and the joint of the cover plate and the manhole is preferably watertight, for example, a sealing ring is provided.

In the treatment process, the gas sprayed through the aeration holes 331 of the aeration pipe 33 carries ammonia nitrogen to float out of the water surface, and simultaneously generates foam on the liquid surface, and after a long time, the foam floating on the liquid surface is accumulated more and more, and the possibility of overflowing out of the box body 31 exists, so the foam is required to be treated. In order to solve the problem, a water level gauge (not shown) is arranged at a predetermined foam height of the accommodating chamber 311, a spray head 36 is arranged at a position of the accommodating chamber 311 higher than the predetermined foam height, the spray head 36 is communicated with a storage tank (not shown) filled with defoaming liquid outside through a delivery pipe (not shown), the delivery pipe is provided with an electromagnetic valve (not shown) capable of controlling the on-off of the delivery pipe, the electromagnetic valve and the water level gauge are electrically connected with a control system (not shown), and when the water level gauge detects that the foam height reaches the predetermined height, the control system opens the electromagnetic valve according to information fed back by the water level gauge, so that the defoaming liquid is sprayed on the foam through the spray head 36, and the foam is eliminated. It should be noted that the defoaming solution is well known in the art, and the detailed description of the components and defoaming principle of the defoaming solution is omitted here.

in an embodiment of the present invention, the top of each aeration pipe 33 is open and closed, the open top is communicated with the gas transmission device located outside the box 31 through the gas inlet pipe 34, the aeration holes of each aeration pipe are arranged in two rows, the aeration holes 331 of each row are distributed along the axial direction (or length direction) of the aeration pipe 33, and each aeration hole 331 is at a 45 degree included angle with the horizontal plane, and the air stripping effect can be further improved by this arrangement.

It should be noted that the number of rows of the boxes 31 and the number of the boxes 31 in each row may be determined according to specific situations, for example, two rows, three rows, four rows, five rows, six rows (in the case of six rows as shown in fig. 7) or more may be provided, the number of the boxes 31 in each row may be two, three (in the case of three as shown in fig. 7), four or more, the boxes 31 in the uppermost row are provided, the water inlet is provided in the left-most box 31, and the water outlet is provided in the right-most box 31; in the next uppermost row of the box bodies 31, the water inlet hole is opened in the rightmost box body 31, the water falling hole is opened in the left box body 31, and so on. The drain hole (not shown) should be provided at a position lower than the liquid level in the tank body, and preferably at the bottom of the tank body

For easy understanding the utility model discloses landfill leachate's processing apparatus is following to adopting the utility model discloses landfill leachate's processing method introduces, as shown in fig. 1 to 10, landfill leachate's processing method, including following step:

S1, inputting the percolate to be treated (or referred to as percolate stock solution, pH 8 ~ 9) into a biochemical tank 1, and carrying out microbial metabolism for 2 ~ 3 days to remove most pollutants mainly including COD (chemical oxygen demand) in the percolate, convert organic nitrogen compounds into ammonia nitrogen (ammonia nitrogen refers to nitrogen existing in two specific forms of ammonium ions and ammonia, such as ammonia water and ammonium bicarbonate), and simultaneously convert part of the ammonia nitrogen into nitrite nitrogen.

Specifically, the step S1 of inputting the leachate to be treated into the biochemical tank 1 and performing microbial metabolism for 2 ~ 3 days includes the steps of performing microbial metabolism on the leachate by a biochemical reaction membrane formed by the propagation of microbial strains attached to a biological zone arranged in the biochemical tank 1 from top to bottom, and aerating the leachate from the bottom of the biochemical tank 1 upwards, wherein the biological zone arranged from bottom to bottom can increase the contact area between the microbial strains and the leachate, and the aeration can increase the oxygen for the microbial strains in the leachate so as to increase the growth and propagation speed of the microbial strains, thereby increasing the treatment speed of the leachate and better removing pollutants such as COD and ammonia nitrogen in the leachate.

S2, inputting the leachate treated by the biochemical tank 1 into an alkali adjusting tank 2, and adding a predetermined amount of solid lime to stir so that the pH value of the leachate reaches 11 ~ 12.

Specifically, the content of solid lime is 80% ~ 90%, for example, 80%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, or 90%, etc., the mass of solid lime added is 0.6% ~ 0.7.7% of the mass (or weight) of the leachate to be alkali-treated, and the stirring time is 15 ~ 20 minutes, so as to facilitate the subsequent stripping.

s3, inputting the leachate after the alkali adjustment treatment into a stripping device 3 for stripping treatment so as to greatly reduce the ammonia nitrogen concentration in the leachate.

Specifically, the step S3 of inputting the leachate after the alkali adjustment treatment into the air-removing device 3 for air-removing treatment includes flowing the leachate after the alkali adjustment treatment from top to bottom to circuitous among the containing chambers of the boxes vertically stacked in rows, inputting gas into a plurality of aeration pipes arranged at the bottom of the containing chamber of each box side by side through a gas transmission device, and entering the leachate in the containing chamber through aeration holes arranged on the peripheral wall of the aeration pipes to change the gas-liquid equilibrium relationship established by the ammonia nitrogen contained in the water, so that the volatile ammonia nitrogen is converted from a liquid phase to a gas phase, and then ascending along the leachate and floating out of the liquid level. Specifically, the gas-liquid ratio in the blow-off process is preferably 3000:1, the retention time of the percolate in the accommodating chamber is preferably 20min, and under the condition, the blow-off effect is better.

S4, inputting the leachate after the air stripping treatment into a flocculation tank 4, adding a ferrous sulfate (FeSO ₄) solution with a preset content and solid soda ash to flocculate suspended pollutants in the leachate so as to reduce the hardness of the leachate and adjust the pH of the leachate to be neutral, precipitating the leachate by a high-density sedimentation tank to form sludge through flocculation, and discharging supernatant from the top end of the high-density sedimentation tank.

specifically, in step S4, the content of the ferrous sulfate solution is 28% ~ 32%, such as 28%, 29%, 30%, 31%, 32%, etc., and the content of the solid soda ash is 97% ~ 98%, the mass (or weight) of the ferrous sulfate solution is 0.2% ~ 0.4.4%, such as 0.2%, 0.3%, 0.4%, etc., of the percolate to be flocculated, preferably 0.3%, and the mass (or weight) of the solid soda ash is 0.3% ~ 0.4.4% of the mass of the percolate to be flocculated.

S5, inputting the water-containing sludge formed after the flocculation precipitation into the first plate-and-frame filter press 5 through the sludge discharge end at the lower part, and performing primary filtration and squeezing on the flocculation precipitation in the water body to obtain a cleaner water body.

In particular, the first plate and frame filter press 5 is well known in the art and the detailed construction and operation thereof will not be described herein. Filtering and squeezing the flocculated precipitate to form a mud cake, and backfilling the mud cake to a refuse landfill.

And S6, inputting the relatively clear water into the carbon adding stirring tank 6, adding a predetermined amount of powdered activated carbon, adsorbing most of residual COD, heavy metals and ammonia nitrogen in the relatively clear water through the powdered activated carbon, and reducing the chroma and odor.

specifically, when the mass (or weight) of the powdered activated carbon is 0.5% ~ 1.5.5%, for example, 0.5%, 1% or 1.5%, preferably 1%, which is the mass of the clearer water to be treated, the adsorption effect is better and the treatment cost is lower.

and S7, inputting the relatively clear water containing the powdered activated carbon into a second plate-and-frame filter press 7 for secondary filter pressing, and filtering and squeezing the powdered activated carbon with saturated adsorption to form clear water.

In particular, the second plate and frame filter press 7 is well known in the art and the detailed construction and operation thereof will not be described herein. The waste powdered activated carbon which is saturated in adsorption and is filtered by the second plate-and-frame filter press 7 can be transported away, and after drying treatment, the powdered activated carbon is regenerated by a carbon regeneration device (namely, most of adsorbed COD, heavy metals, ammonia nitrogen and chromaticity are removed), so that the recycling of the powdered activated carbon is realized, and the treatment cost of the percolate is further reduced.

S8, inputting the clean water into the membrane treatment system 8 to remove most of the contaminants remaining in the clean water.

Specifically, the membrane treatment system 8 is a multistage membrane treatment system 8, and includes an ultrafiltration system 81, a nanofiltration system 82 and a reverse osmosis system 83 which are connected in sequence, and the step S8 of inputting clean water into the membrane treatment system 8 to remove most of the pollutants remaining in the clean water includes a process of filtering the clean water after secondary pressure filtration by the ultrafiltration system 81, the nanofiltration system 82 and the reverse osmosis system 83 in sequence, so that most of the pollutants remaining in the clean water can be removed. Since the ultrafiltration system 81, the nanofiltration system 82 and the reverse osmosis system 83 are all prior art and well known to those skilled in the art, detailed descriptions of the specific structures and working principles of the ultrafiltration system 81, the nanofiltration system 82 and the reverse osmosis system 83 are omitted here.

s9, inputting the clear water treated by the membrane treatment system 8 into a sodium hypochlorite stirring tank 9, adding sodium hypochlorite (NaClO) with preset content to deeply remove the residual ammonia nitrogen, and finishing the treatment of the percolate so that the clear water reaches the discharge standard and can be discharged outwards.

Specifically, in step S9, the content of sodium hypochlorite is 9% ~ 11%, for example 9%, 9.5%, 10%, 10.5% or 11%, preferably 10%.

further, in step S9, in the process that the clean water is sequentially filtered by the ultrafiltration system 81, the nanofiltration system 82 and the reverse osmosis system 83, ultrafiltration concentrated water, nanofiltration concentrated water and reverse osmosis concentrated water are respectively generated, and in order to realize zero concentrated water discharge, the method further comprises inputting the ultrafiltration concentrated water generated by the ultrafiltration system 81 into the carbon adding stirring tank 6 for powdered activated carbon adsorption treatment; inputting nanofiltration concentrated water generated by a nanofiltration system 82 into a secondary carbon adding stirring tank 84, adding a predetermined amount of powdered activated carbon to adsorb residual COD, heavy metals and ammonia nitrogen in the nanofiltration concentrated water, reducing chroma and odor, and inputting the nanofiltration concentrated water into a second plate-and-frame filter press for filter pressing; and a process of inputting the reverse osmosis concentrated water generated by the reverse osmosis system 83 into the ultrafiltration system 81 for ultrafiltration. It should be noted that the second carbon adding stirring tank 84 is also well known in the art and the detailed structure and operation thereof will not be described herein.

Further, before step S1, the method further includes the steps of inputting the percolate to be treated into the regulating tank, regulating the water quality and quantity, and inputting the percolate into the biochemical tank 1.

the treatment method of the landfill leachate is adopted to treat the leachate, and after the water quality after the corresponding steps is sampled and detected, the corresponding results are obtained as shown in the following table:

	COD（mg/L）	Ammonia nitrogen (mg/L)	total nitrogen (mg/L)	Total phosphorus (mg/L)	suspended pollutant (mg/L)	Color intensity
							Adjusting tank percolate stock solution	10000	4000	5000	40	2500	300
Biochemical tank treatment	4000	3000	3500	40	2000	300
							Alkali adjustment and stripping treatment	3950	400	500	40	800	200
Flocculation and filter pressing treatment	1800	350	380	1.3	40	80
							Adsorption treatment of powdered activated carbon	600	230	280	1.3	25	40
Membrane treatment system 8 and sodium hypochlorite deepening treatment	≤100	≤25	≤30	≤0.8	≤15	≤20

According to the change conditions of indexes such as COD, ammonia nitrogen, total phosphorus, suspended pollutants, chromaticity and the like of the table, the COD, ammonia nitrogen, total phosphorus, suspended pollutants and chromaticity of the leachate stock solution are 10000mg/L, 4000mg/L, 5000mg/L, 40mg/L, 2500mg/L and 300 respectively; after being treated by the biochemical tank 1, the concentration is respectively changed into 4000mg/L, 3000mg/L, 3500mg/L, 40mg/L, 2000mg/L and 300; after alkali adjustment and air stripping treatment, the concentration is respectively changed into 3950mg/L, 400mg/L, 500mg/L, 40mg/L, 800mg/L and 200; after flocculation and filter pressing treatment, respectively changing the concentration to 1800mg/L, 350mg/L, 380mg/L, 1.3mg/L, 40mg/L and 80; respectively changing the concentration of the active carbon into 600mg/L, 230mg/L, 280mg/L, 1.3mg/L, 25mg/L and 40 after the active carbon powder adsorption treatment; after the membrane treatment system 8 and sodium hypochlorite are deeply treated, the final change is not more than 100mg/L, not more than 25mg/L, not more than 30mg/L, not more than 0.8mg/L, not more than 15mg/L and not more than 20 respectively, and is lower than the new standard GB16889-2008 of the landfill leachate. Can be discharged outwards.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.

Claims (10)

1. A landfill leachate's processing apparatus, its characterized in that includes:

The biochemical tank is internally provided with microbial strains and is used for carrying out microbial metabolism on the percolate to be treated input into the biochemical tank;

The water inlet end of the soda adjusting tank is communicated with the water outlet end of the biochemical tank through a pipeline and is used for stirring percolate treated by the biochemical tank and input into the biochemical tank and predetermined amount of lime added into the biochemical tank so that the pH value of the percolate reaches 11 ~ 12;

The water inlet end of the air stripping device is communicated with the water outlet end of the alkali adjusting tank through a pipeline, and the air stripping treatment is carried out on the percolate which is subjected to alkali adjusting treatment and is input into the air stripping device so as to greatly reduce the concentration of ammonia nitrogen in the percolate;

The water inlet end of the flocculation tank is communicated with the water outlet end of the air stripping device through a pipeline, so that suspended pollutants in the leachate which is subjected to air stripping treatment and is input into the flocculation tank can be subjected to flocculation reaction with ferrous sulfate solution and solid soda with preset content, which are added into the flocculation tank, the hardness of the leachate is reduced, and the pH value of the leachate is regulated to be neutral;

The water inlet end of the high-density sedimentation tank is communicated with the water outlet end of the flocculation tank, so that flocculate in the landfill leachate is precipitated to form sludge, and supernatant flows out from the top end of the high-density sedimentation tank;

The water inlet end of the first plate-and-frame filter press is communicated with the sludge discharge end of the high-density sedimentation tank through a pipeline, and the water-containing sludge input into the first plate-and-frame filter press is subjected to primary filtration and squeezing to obtain a relatively clear water body;

the water inlet end of the carbon adding stirring tank is communicated with the water outlet end at the top end of the high-density sedimentation tank and the water outlet end of the first plate-and-frame filter press through a pipeline, and the clear water body input into the carbon adding stirring tank and the powdered activated carbon added with a preset amount are stirred so as to adsorb most of residual COD, heavy metals and ammonia nitrogen in the clear water body through the powdered activated carbon and reduce the chroma and the odor;

the water inlet end of the second plate-and-frame filter press is communicated with the carbon adding stirring tank through a pipeline, and secondary filter pressing is carried out on the water body containing the powdered activated carbon input into the second plate-and-frame filter press to form clear water;

the water inlet end of the membrane treatment system is communicated with the water outlet end of the second plate-and-frame filter press through a pipeline, and the membrane treatment system is used for carrying out membrane filtration treatment on the clear water input into the membrane treatment system; and

And the water inlet end of the sodium hypochlorite stirring tank is communicated with the water outlet end of the multi-stage membrane system through a pipeline, and the clear water subjected to membrane filtration treatment and input reacts with sodium hypochlorite with a preset content added in the clear water so as to carry out deep removal treatment on the residual ammonia nitrogen.

2. The landfill leachate treatment plant of claim 1, wherein: biochemical jar is including a jar body, and the internal portion cavity of jar forms the accommodation space of splendid attire penetrant, and the water inlet and the delivery port that lead to accommodation space are seted up to the outer wall of jar body, and water inlet and delivery port are used for connecting inlet tube and outlet pipe respectively, accommodation space is provided with the adnexed biological zone of confession microbial species from top to bottom, and accommodation space's bottom is provided with a plurality of aeration equipment, aeration equipment's venthole up, aeration equipment's income gas port passes through the trachea and links to each other with the gas transmission device that is located the.

3. the landfill leachate treatment plant of claim 2, wherein: a plurality of supporting frames are installed at the vertical interval of the accommodating space, and a plurality of biological belts are installed at the horizontal interval of each supporting frame.

4. The landfill leachate treatment plant of claim 2, wherein: the position that the outer wall of the tank body is lower than the water outlet is provided with a sludge discharge port communicated with the containing space, and the sludge discharge port is connected with a water suction pump through a sludge discharge pipe.

5. The landfill leachate treatment plant of claim 1, wherein: the blow-off device comprises a plurality of rows of box bodies which are vertically stacked and arranged, the box bodies in each row are hollow to form accommodating chambers, the accommodating chambers of the adjacent box bodies in the same row are communicated through overflow holes or pipelines, two box bodies positioned at two sides of each row are respectively provided with a water inlet hole and a water falling hole which are communicated with the accommodating chambers, and in two rows of boxes adjacent from top to bottom, it is vertical adjacent to be located the box that one row of holes in water that are equipped with in the top and one row of box that is equipped with the inlet opening in the below, it links to each other to lead to the connecting pipe that falls into water between hole in the water and the inlet opening, it is circuitous flow from top to bottom to make filtration liquid can pile up between the box of range at the multirow is vertical, the bottom of the accommodation chamber of every box is provided with many aeration pipes side by side, the aeration pipe passes through the intake pipe and links to each other with the gas transmission device that is located outside the box, the perisporium of aeration pipe is equipped with the aeration.

6. The landfill leachate treatment plant of claim 5, wherein: a manhole is arranged at the position, higher than the liquid level, of the box body, and a baffle capable of sealing the manhole is detachably mounted at the manhole.

7. The landfill leachate treatment plant of claim 5, wherein: the head end of each aeration pipe is opened and the tail end is closed, the opened head end is communicated with an air conveying device positioned outside the box body through an air inlet pipe, the aeration holes of each aeration pipe are arranged in two rows, the aeration holes of each row are distributed at intervals along the axial direction of the aeration pipe, and the included angle of 45 degrees is formed between each aeration hole and the horizontal plane.

8. The landfill leachate treatment plant of claim 5, wherein: the predetermined foam of accommodation chamber highly locates to be provided with the fluviograph, the position that the accommodation chamber is higher than predetermined foam height is equipped with the shower head, the shower head leads to with the outside holding vessel that contains defoaming liquid through the conveyer pipe and links to each other, the solenoid valve that can be used to control its break-make is installed to the conveyer pipe, solenoid valve and fluviograph are connected with control system electricity, when the fluviograph detects that the foam height reaches predetermined height, control system opens the solenoid valve according to the information of fluviograph feedback, make defoaming liquid spout on the foam through the shower head.

9. The landfill leachate treatment plant of any one of claims 1 to 8, wherein: still include the secondary and add the charcoal agitator tank, membrane processing system is multistage membrane processing system including consecutive ultrafiltration system, receive filtration system and reverse osmosis system, ultrafiltration system's the concentrated water outlet end of ultrafiltration leads to with the income water end that adds the charcoal agitator tank through the pipeline and links to each other, receive filtration system's the concentrated water outlet end of receiving filtration leads to through the income water end that pipeline and secondary add the charcoal agitator tank and links to each other, the outlet end that secondary adds the charcoal agitator tank leads to with the income water end of second plate and frame pressure filter, reverse osmosis system's the concentrated water outlet end of reverse osmosis leads to through the income water end that pipeline and ultrafiltration system lead to each other.

10. The landfill leachate treatment plant of claim 9, wherein: the device also comprises an adjusting tank, wherein the water outlet end of the adjusting tank is communicated with the water inlet end of the biochemical tank through a pipeline, and the percolate to be treated is input into the adjusting tank, is subjected to water quality and water quantity adjustment and then is input into the biochemical tank.