CN111087135A

CN111087135A - Treatment process and equipment for landfill leachate

Info

Publication number: CN111087135A
Application number: CN202010050207.5A
Authority: CN
Inventors: 张长安; 谢建平; 杨海洪; 彭芳
Original assignee: Henan Yingweitai Environmental Technology Co Ltd
Current assignee: Henan Yingweitai Environmental Technology Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-05-01

Abstract

The invention discloses a treatment process of landfill leachate, which relates to the related technical field of garbage treatment and comprises the following steps: step A: flocculating and settling, step B: catalytic oxidation, step C: reaction and step D: and E, treatment and step E: and (5) discharging. A treatment process and equipment for landfill leachate comprise a box body, wherein a motor is fixedly connected in the middle of the bottom of the box body, a rotating shaft is fixedly connected at one end of the motor, a driving gear is fixedly connected at one end of the rotating shaft, and an ozone box is fixedly connected in the middle of the top of the box body. Advanced oxidation can not only greatly reduce COD, but also properly increase BOD concentration, thereby achieving the purpose of improving the biodegradability of sewage.

Description

Treatment process and equipment for landfill leachate

Technical Field

The invention relates to the technical field related to garbage treatment, in particular to a treatment process of garbage leachate.

Background

The landfill leachate is sewage seeped out by the fermentation, rain wash and surface water and underground water soaking of the garbage in the stacking and landfill processes.

The main treatment task of the landfill leachate is to decompose organic pollutants and remove inorganic salts with pollution properties. The physical and chemical method and the biological method are the main processes for treating the landfill leachate at present. The process for treating the landfill leachate by a physical and chemical method mainly comprises the steps of coagulating sedimentation, ammonia stripping, adsorption, membrane separation, chemical oxidation and the like. Compared with biological method, the physical and chemical method has the advantages of no influence of the quality and quantity of inlet water, large impact load bearing of the treatment process, relatively stable quality of outlet water and the like. Particularly, the method has better treatment effect on the components which are difficult to biodegrade and have lower BOD5/COD ratio (0.07-0.20), but the investment and the operation cost of the physical and chemical method are high.

The biological method is still the main process for treating the landfill leachate due to low investment and operation cost. The biological method is divided into aerobic biological treatment, anaerobic biological treatment and anaerobic-aerobic combined process. No matter which biochemical process is adopted, the B/C ratio of the leachate is low, the starting is slow, and the effluent quality cannot meet the standard and is difficult, so that the treatment process of the landfill leachate is necessary to solve the problems.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a treatment process of landfill leachate, which solves the problems in the prior art.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a treatment process and equipment for landfill leachate comprise the following steps:

step A: flocculation and sedimentation: firstly, sequentially carrying out flocculation sedimentation and filter pressing on the domestic garbage percolate;

and B: catalytic oxidation: then the domestic garbage leachate after flocculation sedimentation and filter pressing is placed into a micro-nano generator;

and C: reaction: finally, the household garbage percolate after catalytic oxidation is put into a Moving Bed Biofilm Reactor (MBBR) for reaction;

step D: and (3) treatment: after Moving Bed Biofilm Reactor (MBBR) treatment, COD can not be reduced below the discharge standard, and RO process is required to be added to remove inorganic salt and undegradable organic pollutants in the domestic garbage percolate;

step E: discharging: and detecting the domestic garbage percolate, and discharging when the detection of the domestic garbage percolate reaches the standard.

Optionally, in the step a, sludge is generated after the domestic landfill leachate is subjected to filter pressing, and the sludge is collected and additionally treated.

Optionally, in the step B, the micro-nano generator adds ozone while performing catalytic oxidation on the domestic landfill leachate, and ozone is used as a hydroxyl radical initiator.

The treatment equipment for the landfill leachate comprises a box body, wherein a motor is fixedly connected in the middle of the bottom of the box body, one end of the motor is fixedly connected with a rotating shaft, one end of the rotating shaft is fixedly connected with a driving gear, an ozone box is fixedly connected in the middle of the top of the box body, a first connecting pipe is fixedly connected in the middle of the bottom of the ozone box, two ends of the ozone box are fixedly connected with second connecting pipes, one ends of the first connecting pipe and the second connecting pipe are fixedly connected with a splitter plate, and one side of the splitter plate is fixedly connected with a spray head;

the inner chamber bottom fixedly connected with baffle of box, the equal swing joint in both ends of baffle has the bull stick, the one end fixedly connected with spiral stirring piece of bull stick, the other end fixedly connected with driven gear of bull stick, the bottom fixedly connected with supporting leg of box.

Optionally, the equal fixedly connected with feed liquor pipe in top both sides of box, the equal fixedly connected with drain pipe in bottom both sides of box.

Optionally, one end of each of the first connecting pipe and the second connecting pipe penetrates through the top of the box body and is located inside the box body.

Optionally, the flow distribution plate is located on the inner top wall of the box body and is fixedly connected with the box body;

the spray heads are positioned above the spiral stirring sheet and correspond to the spiral stirring sheet.

Optionally, the number of the spray heads is multiple, and the multiple spray heads are arranged on the flow distribution plate at equal intervals.

Optionally, one end of the rotating rod is located on the inner top wall of the box body and is movably connected with the box body.

Optionally, the driving gear is located on one side of the driven gear and is in meshed connection with the driven gear, the number of the driven gears is two, and the rotation directions of the two driven gears are the same.

(III) advantageous effects

The invention provides a treatment process and equipment for landfill leachate, which have the following beneficial effects:

(1) the invention takes ozone as an oxidant, does not introduce other chemical substances into the sewage, takes micro-nano air bubbles as assistance, and quickly generates high-concentration hydroxyl free radicals with super-strong oxidability in a mode of catalyzing ozone, thereby greatly improving the advanced oxidation efficiency. Advanced oxidation can not only greatly reduce COD, but also rapidly increase BOD concentration, thereby achieving the purpose of improving the biodegradability of sewage, rather than creating conditions for biochemical treatment by means of additional nutrient substances. The superstrong hydroxyl free radical decomposes the ammonium salt and the nitrogenous organic matter while decomposing the organic matter, reaches the purpose of getting rid of the ammonia nitrogen, has avoided the process that blows off the ammonia nitrogen through changing sewage PH value, no longer discharges the ammonia pollutant to the environment, has simplified the filtration liquid treatment process greatly.

(2) The spiral stirring sheet on the driven gear can be driven to rotate through the matching of the driving gear and the driven gear, so that the spiral stirring sheet can stir the landfill leachate and the gas in the box body, the landfill leachate and the gas can be conveniently and fully mixed, and the working efficiency of catalytic oxidation of the landfill leachate is effectively improved.

Drawings

FIG. 1 is a schematic view of the process of the present invention.

Fig. 2 is a perspective view of the present invention.

FIG. 3 is a schematic sectional front view of the structure of the present invention.

FIG. 4 is a schematic side view of the structure of the present invention.

In the figure: 1. a box body; 2. a motor; 3. a rotating shaft; 4. a driving gear; 5. an ozone tank; 6. a first connecting pipe; 7. a flow distribution plate; 8. a second connecting pipe; 9. a spray head; 10. a partition plate; 11. a rotating rod; 12. a spiral stirring sheet; 13. a driven gear; 14. supporting legs; 15. a liquid inlet pipe; 16. a liquid outlet pipe; 17. and (5) sealing a bearing sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "fixed" are used in a broad sense and can be, for example, fixedly connected, detachably connected, mechanically connected, directly connected, or indirectly connected through an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The invention provides a treatment process and equipment for landfill leachate, which are shown in figure 1 and comprise the following steps:

step A: flocculation and sedimentation: firstly, sequentially performing flocculation sedimentation and filter pressing on the domestic garbage percolate, generating sludge after the domestic garbage percolate is subjected to filter pressing, collecting the sludge and additionally treating the sludge;

and B: catalytic oxidation: then the domestic garbage leachate after flocculation sedimentation and filter pressing is placed into a micro-nano generator, the micro-nano generator adds ozone while carrying out catalytic oxidation on the domestic garbage leachate, and the ozone is used as a hydroxyl radical initiator;

The working principle is as follows:

suspended matters and part of organic pollutants which can be adsorbed by the flocculating agent in the leachate are removed through flocculation and sedimentation, and interference is discharged for subsequent advanced oxidation. Ozone is used as a hydroxyl radical initiator, the concentration of hydroxyl radicals is increased to the maximum extent by a catalyst, organic pollutants in the leachate are rapidly degraded by means of the super-strong organic matter decomposition performance of the hydroxyl radicals, and the B/C ratio is improved. Creates conditions for reducing the burden of biochemical treatment. The MBBR system is used after the COD is greatly reduced and the BOD is improved by advanced oxidation, and the main purpose is to reduce the system investment and the percolate treatment cost. For fresh landfill leachate and young landfill leachate, when the concentration of inorganic salt is not high, the MBBR can reach the discharge standard without deep purification. In case of leachate from an older landfill, the COD cannot be reduced below the emission standard after MBBR, and an RO process is required to remove inorganic salts and undegradable organic pollutants. The system does not have a special ammonia nitrogen removal process because ammonia nitrogen is removed in the advanced oxidation stage, and the emission requirement can be met.

The invention provides a treatment device of landfill leachate as shown in figures 2-4, which comprises a box body 1, wherein both sides of the top of the box body 1 are fixedly connected with a liquid inlet pipe 15, both sides of the bottom of the box body 1 are fixedly connected with a liquid outlet pipe 16, the middle of the bottom of the box body 1 is fixedly connected with a motor 2, the motor 2 can drive a driving gear 4 on a rotating shaft 3 to rotate, one end of the motor 2 is fixedly connected with the rotating shaft 3, one end of the rotating shaft 3 is fixedly connected with the driving gear 4, the driving gear 4 is positioned at one side of a driven gear 13 and is meshed and connected with the driven gear 13, the matching of the driving gear 4 and the driven gear 13 can drive a spiral stirring sheet 12 on the driven gear 13 to rotate, so that the spiral stirring sheet 12 can stir the landfill leachate and gas in the box body 1, the complete mixing of the landfill leachate, the middle of the top of the box body 1 is fixedly connected with an ozone box 5, the middle of the bottom of the ozone box 5 is fixedly connected with a first connecting pipe 6, two ends of the ozone box 5 are fixedly connected with a second connecting pipe 8, one end of each of the first connecting pipe 6 and the second connecting pipe 8 penetrates through the top of the box body 1 and is positioned inside the box body 1, one end of each of the first connecting pipe 6 and the second connecting pipe 8 is fixedly connected with a splitter plate 7, the splitter plate 7 is positioned on the inner top wall of the box body 1 and is fixedly connected with the box body 1, one side of the splitter plate 7 is fixedly connected with a spray head 9, the spray head 9 can uniformly spray gas in the ozone box 5 into the box body 1, the spray heads 9 are positioned above the spiral stirring sheets 12 and correspond to the spiral stirring sheets 12, the number of the spray heads 9 is a plurality, the spray heads 9 are arranged on the splitter plate 7 at equal intervals, the bottom of an inner cavity of the box body 1 is, bull stick 11 is located bearing seal cover 17 and with bearing seal cover 17 fixed connection, bearing seal cover 17 can fix the position of bull stick 11, it is more stable at the rotation in-process to make bull stick 11, the equal swing joint in both ends of baffle 10 has bull stick 11, the one end of bull stick 11 is located box 1's interior roof and with box 1 swing joint, the one end fixedly connected with spiral stirring piece 12 of bull stick 11, the other end fixedly connected with driven gear 13 of bull stick 11, driven gear 13's quantity has two, two driven gear 13's rotation direction is the same, box 1's bottom fixedly connected with supporting leg 14.

The working principle is as follows:

landfill leachate enters into box 1 through feed liquor pipe 15 earlier in, then motor 2 drives driving gear 4 through pivot 3 and rotates, driving gear 4 drives spiral stirring piece 12 on the bull stick 11 through driven gear 13 and rotates, simultaneously shower nozzle 9 sprays the box 1 with the gas in the ozone case 5 in, make spiral stirring piece 12 stir landfill leachate and the gas in the box 1, the abundant mixture of landfill leachate and gas of being convenient for, thereby effectual improvement landfill leachate catalytic oxidation's work efficiency.

It is noted that in the present disclosure, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacted with the first and second features, or indirectly contacted with the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A treatment process and equipment for landfill leachate are characterized by comprising the following steps:

2. The landfill leachate treatment process and equipment according to claim 1, wherein the process comprises the following steps:

and B, generating sludge after the domestic garbage percolate is subjected to filter pressing in the step A, and collecting and additionally treating the sludge.

3. The landfill leachate treatment process and equipment according to claim 1, wherein the process comprises the following steps:

and B, adding ozone while performing catalytic oxidation on the domestic landfill leachate by using the micro-nano generator, wherein the ozone is used as a hydroxyl radical initiator.