Landfill leachate pretreatment integrated device

Abstract

The utility model discloses a landfill leachate pretreatment integrated device which comprises an impurity removal area, a coagulation area, a flocculation area and a sedimentation area which are connected in sequence, and further comprises a hardness removal area arranged between the impurity removal area and the coagulation area and an acid adjustment area communicated with the sedimentation area, the hardness removal area comprises an alkali adjustment pool, a first dosing tank and a second dosing tank, the first dosing tank and the second dosing tank are respectively communicated with the alkali adjusting pool through two liquid pumping pieces, the first dosing tank is filled with a sodium hydroxide solution, and the second dosing tank is filled with a sodium carbonate solution; the acid adjusting area comprises an acid adjusting pool and a third dosing tank, the third dosing tank is communicated with the acid adjusting pool through a medicine pump, and an acid solution is contained in the third dosing tank; the problems that in the prior art, SS in the landfill leachate is high in hardness, and membrane blockage is likely to be caused are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage leachate pretreatment, in particular to a garbage leachate pretreatment integrated device. Background Art

[0002] Leachate refers to a high-concentration organic wastewater formed by the moisture contained in the garbage itself in the landfill, rainwater, snow and other moisture that enters the landfill, minus the saturated water holding capacity of the garbage and covering soil layers, and the moisture that seeps from the accumulated garbage prepared for incineration.

[0003] As the discharge standards of landfill leachate are increasingly stringent, the requirements for related technologies are also getting higher and higher. Usually, the deep treatment of landfill leachate is achieved through membrane combination processes such as ultrafiltration, nanofiltration, and reverse osmosis. However, the operation of the membrane combination process has high requirements on the water quality of the influent, especially SS and hardness. The SS and hardness in the landfill leachate are relatively high, which can easily cause membrane clogging. Therefore, the front-end pretreatment of the membrane combination process is particularly important. Utility Model Content

[0004] The purpose of the utility model is to overcome the above technical deficiencies, provide a landfill leachate pretreatment integrated device, and solve the problem in the prior art that the landfill leachate has high SS and hardness, which easily causes membrane clogging.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an integrated device for pre-treatment of landfill leachate, comprising a de-impurity zone, a coagulation zone, a flocculation zone and a sedimentation zone connected in sequence, and also comprising a hardness removal zone arranged between the de-impurity zone and the coagulation zone, and an acid adjustment zone connected with the sedimentation zone, wherein the hardness removal zone comprises an alkali adjustment tank, a first drug adding box and a second drug adding box, wherein the first drug adding box and the second drug adding box are respectively connected with the alkali adjustment tank via two liquid extraction parts, wherein the first drug adding box contains a sodium hydroxide solution, and the second drug adding box contains a sodium carbonate solution; wherein the acid adjustment zone comprises an acid adjustment tank and a third drug adding box, wherein the third drug adding box is connected with the acid adjustment tank via a drug extraction pump, and wherein the third drug adding box contains an acidic solution.

[0007] In some embodiments, the impurity removal area includes an impurity removal tank and a filter screen disposed in the impurity removal tank, wherein the filter screen is used to remove large particles of impurities in the landfill leachate.

[0008] In some embodiments, the hard-removing zone further includes a first stirring member and a second stirring member, and the first stirring member and the second stirring member are respectively disposed in the first and second medicine adding boxes.

[0009] In some embodiments, the coagulation zone includes a coagulation tank, a coagulant dosing box and a coagulant dosing pump. The coagulant dosing box is connected to the coagulation tank via the coagulant dosing pump. The coagulant dosing box contains polyaluminium chloride solution.

[0010] In some embodiments, a third stirring element is further provided in the coagulant dosing box.

[0011] In some embodiments, the flocculation area includes a flocculation tank, a flocculant dosing box and a flocculant dosing pump. The flocculant dosing box is connected to the flocculation tank via the flocculant dosing pump, and the flocculant dosing box contains a polyaluminum sulfate solution.

[0012] In some embodiments, a fourth stirring element is disposed in the flocculant dosing tank.

[0013] In some embodiments, the sedimentation area includes a sedimentation tank, multiple partitions, a water outlet baffle and an overflow weir. The multiple partitions are spaced and inclined in the sedimentation tank. A sludge collection chamber is formed below the multiple partitions, and a clear liquid collection chamber is formed above the multiple partitions. The water outlet baffle is fixed in the clear liquid collection chamber, and the overflow weir is fixed in the clear liquid collection chamber and is located on one side of the water outlet baffle.

[0014] In some embodiments, a fifth stirring element is further provided in the third dosing box.

[0015] In some embodiments, a dehydrator is further included, and the dehydrator is connected to the sludge collection chamber via a sludge pump.

[0016] Compared with the prior art, the utility model provides an integrated device for pretreatment of landfill leachate, which includes an impurity removal zone, a coagulation zone, a flocculation zone and a sedimentation zone. The hardness removal zone is arranged between the impurity removal zone and the coagulation zone, and the acid adjustment zone is connected with the sedimentation zone. The hardness removal zone includes an alkali adjustment tank, a first drug adding box and a second drug adding box. The first drug adding box and the second drug adding box are connected with the alkali adjustment tank via two liquid extraction parts respectively. The first drug adding box contains sodium hydroxide solution, and the second drug adding box contains sodium carbonate solution. The acid adjustment zone includes an acid adjustment tank and a third drug adding box. The third drug adding box is connected with the acid adjustment tank via a drug extraction pump, and the third drug adding box contains acid solution. The front-end pretreatment of the leachate can be realized by integrating SS removal, hardness removal and pH adjustment, thereby ensuring the normal operation of the back-end deep treatment membrane combination process. The frequency of membrane blockage and cleaning is reduced, which helps to increase the service life of the membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a landfill leachate pretreatment integrated device provided by an embodiment of the utility model;

[0018] Figure 2It is a schematic diagram of the internal structure of the precipitation zone provided in the embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] In order to solve the technical problem that high SS and hardness in landfill leachate easily cause membrane clogging, the utility model provides an integrated landfill leachate pretreatment device, which can realize SS removal, hardness removal and pH adjustment in one, thereby realizing front-end pretreatment of the leachate.

[0021] See also Figure 1 and Figure 2 , Figure 1 The utility model discloses an integrated device for pre-treatment of landfill leachate in one embodiment, comprising a de-impurity zone 1, a coagulation zone 2, a flocculation zone 3 and a sedimentation zone 4 connected in sequence, and also comprising a hardness removal zone 5 arranged between the de-impurity zone 1 and the coagulation zone 2, and an acid adjustment zone 6 connected to the sedimentation zone 4, wherein the hardness removal zone 5 comprises an alkali adjustment tank 51, a first drug adding box 52 and a second drug adding box 53, wherein the first drug adding box 52 and the second drug adding box 53 are respectively connected to the alkali adjustment tank 51 via two liquid extraction parts, the first drug adding box 52 contains sodium hydroxide solution, and the second drug adding box 53 contains sodium carbonate solution; the acid adjustment zone 6 comprises an acid adjustment tank 61 and a third drug adding box 62, wherein the third drug adding box 62 is connected to the acid adjustment tank 61 via a drug extraction pump 63, the third drug adding box 62 contains acid solution, and the third drug adding box 62 is also provided with a fifth stirring member 64.

[0022] In this specific embodiment, the impurity removal area 1 includes an impurity removal tank 11 and a filter screen 12 disposed in the impurity removal tank 11, and the filter screen 12 is used to remove large particles of impurities in the landfill leachate. It should be noted that the mesh of the filter screen 12 can be designed according to actual conditions to ensure that large particles of impurities in the landfill leachate can be filtered out.

[0023] On the basis of the above scheme, the hard-removing zone 5 further includes a first stirring member 54 and a second stirring member 55, which are respectively arranged in the first dosing box 52 and the second dosing box 53. It should be noted that the first stirring member 54 and the second stirring member 55 can stir the liquid in the first dosing box 52 and the second dosing box 53 respectively.

[0024] Furthermore, powdered sodium hydroxide and sodium carbonate are added into the first dosing box 52 and the second dosing box 53 respectively, and the sodium hydroxide and sodium carbonate are evenly mixed with the liquids in the first dosing box 52 and the second dosing box 53 respectively to form a sodium hydroxide solution and a sodium carbonate solution.

[0025] In this specific embodiment, the coagulation zone 2 includes a coagulation tank 21, a coagulant dosing box 22 and a coagulant dosing pump 23. The coagulant dosing box 22 is connected to the coagulation tank 21 via the coagulant dosing pump 23. The coagulant dosing box 22 contains polyaluminium chloride solution.

[0026] Furthermore, a third stirring member 24 is provided in the coagulant dosing box 22, and the third stirring member 24 stirs the liquid in the coagulant dosing box 22 to prepare the polyaluminium chloride solution.

[0027] It should be noted that the polyaluminium chloride solution in the coagulant dosing box 22 is pumped into the coagulation tank 21 by the coagulant dosing pump 23. The polyaluminium chloride solution has good adsorption properties and can aggregate suspended matter in the landfill leachate.

[0028] In this specific embodiment, the flocculation area 3 includes a flocculation tank 31, a flocculant dosing box 32 and a flocculant dosing pump 33. The flocculant dosing box 32 is connected to the flocculation tank 31 via the flocculant dosing pump 33. The flocculant dosing box 32 contains a polyaluminum sulfate solution. A fourth stirring member 34 is provided in the flocculant dosing box 32.

[0029] In this specific embodiment, please refer to Figure 2 The sedimentation area 4 includes a sedimentation tank 41, a plurality of partitions 42, a water outlet baffle 43 and an overflow weir 44. The plurality of partitions 42 are spaced and inclined in the sedimentation tank 41. A sludge collecting chamber is formed below the plurality of partitions 42. A clear liquid collecting chamber is formed above the plurality of partitions 42. The water outlet baffle 43 is fixed in the clear liquid collecting chamber. The overflow weir 44 is fixed in the clear liquid collecting chamber and is located on one side of the water outlet baffle 43.

[0030] On the basis of the above scheme, a dehydrator 7 is further included, and the dehydrator 7 is connected to the sludge collecting chamber via a sludge pump. The dehydrator 7 can separate the sludge from the water, and the dried sludge is convenient for transportation.

[0031] In order to better understand the present invention, the following Figure 1 to Figure 2The technical scheme of the utility model is described in detail: through the impurity removal zone, coagulation zone, flocculation zone and sedimentation zone, the hardness removal zone is arranged between the impurity removal zone and the coagulation zone, the acid adjustment zone is connected with the sedimentation zone, the hardness removal zone includes an alkali adjustment tank, a first drug adding box and a second drug adding box, the first drug adding box and the second drug adding box are connected with the alkali adjustment tank via two liquid extraction parts respectively, the first drug adding box is filled with sodium hydroxide solution, and the second drug adding box is filled with sodium carbonate solution; the acid adjustment zone includes an acid adjustment tank and a third drug adding box, the third drug adding box is connected with the acid adjustment tank via a drug extraction pump, and the third drug adding box is filled with an acidic solution; the front-end pretreatment of the leachate can be realized by integrating SS removal, hardness removal and pH adjustment, and the normal operation of the back-end deep treatment membrane combination process is ensured; the frequency of membrane blockage and cleaning is reduced, which helps to increase the service life of the membrane.

[0032] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A landfill leachate pretreatment integrated device, comprising a sequentially connected impurity removal zone, a coagulation zone, a flocculation zone and a sedimentation zone, characterized in that: It also includes a hardness removal zone located between the impurity removal zone and the coagulation zone, and an acid adjustment zone connected to the precipitation zone. The hardness removal area includes an alkali adjustment tank, a first medicine adding box and a second medicine adding box, wherein the first medicine adding box and the second medicine adding box are respectively connected to the alkali adjustment tank via two liquid extraction parts, the first medicine adding box contains sodium hydroxide solution, and the second medicine adding box contains sodium carbonate solution; The acid adjustment area includes an acid adjustment tank and a third drug adding box. The third drug adding box is connected to the acid adjustment tank via a drug extraction pump. The third drug adding box contains an acid solution.

2. The integrated device for pretreatment of landfill leachate according to claim 1, characterized in that: The impurity removal area includes an impurity removal tank and a filter screen arranged in the impurity removal tank, and the filter screen is used to remove large particle impurities in the landfill leachate.

3. The integrated device for pretreatment of landfill leachate according to claim 1, characterized in that: The hard-removing area further includes a first stirring member and a second stirring member, and the first stirring member and the second stirring member are respectively arranged in the first medicine adding box and the second medicine adding box.

4. The integrated device for pretreatment of landfill leachate according to claim 1, characterized in that: The coagulation area comprises a coagulation tank, a coagulant dosing box and a coagulant dosing pump. The coagulant dosing box is connected with the coagulation tank via the coagulant dosing pump. The coagulant dosing box contains polyaluminium chloride solution.

5. The integrated device for pre-treatment of landfill leachate according to claim 4, characterized in that: A third stirring element is also arranged in the coagulant adding box.

6. The integrated device for pre-treatment of landfill leachate according to claim 1, characterized in that: The flocculation area includes a flocculation tank, a flocculant dosing box and a flocculant dosing pump. The flocculant dosing box is connected to the flocculation tank via the flocculant dosing pump. The flocculant dosing box contains a polyaluminum sulfate solution.

7. The integrated device for pre-treatment of landfill leachate according to claim 6, characterized in that: A fourth stirring element is arranged in the flocculant adding box.

8. The integrated device for pre-treatment of landfill leachate according to claim 1, characterized in that: The sedimentation area includes a sedimentation tank, multiple partitions, a water outlet baffle and an overflow weir. The multiple partitions are spaced and inclined in the sedimentation tank. A sludge collection chamber is formed below the multiple partitions, and a clear liquid collection chamber is formed above the multiple partitions. The water outlet baffle is fixed in the clear liquid collection chamber, and the overflow weir is fixed in the clear liquid collection chamber and is located on one side of the water outlet baffle.

9. The integrated device for pre-treatment of landfill leachate according to claim 1, characterized in that: The third medicine adding box is also provided with a fifth stirring member.

10. The integrated device for pre-treatment of landfill leachate according to claim 8, characterized in that: It also includes a dehydrator, which is connected to the sludge collecting chamber via a sludge pump.

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