A garbage leachate solidification and sludge incineration treatment system

Abstract

The present invention relates to a garbage leachate solidification mud incineration treatment system, comprising a self-mixing mud maker, a leachate supply component, a coal powder supply component, a lime powder supply component, a solidifying agent supply component and a control system, wherein the self-mixing mud maker has a leachate inlet, a coal powder inlet, a lime powder inlet, a solidifying agent inlet and a mud outlet, and a conveying member is arranged between the leachate inlet and the mud outlet in the self-mixing mud maker, and the coal powder inlet, the lime powder inlet and the solidifying agent inlet are located at the leachate inlet and above the conveying member. The present invention solidifies the leachate into mud by mixing the leachate with coal powder, lime powder and a solidifying agent, and can form a strong solidifying net to efficiently wrap and fix the pollutants in the leachate during the treatment process, and the treated sludge is put into the furnace for incineration, thereby effectively treating the leachate and effectively reusing the leachate, and the structure is simple and the system cost is low.

Description

Technical Field

[0001] The invention relates to the field of landfill leachate treatment, and in particular to a landfill leachate solidification-to-sludge incineration treatment system. Background Art

[0002] Garbage-to-energy enterprises will produce a certain amount of leachate due to the accumulation of garbage. The leachate has complex composition, high concentration of pollutants and limited calorific value. Therefore, it is prohibited to discharge it. It is difficult to purify it, especially the concentrated liquid after biochemical treatment. Existing garbage incineration plants use chemical oxidants and activated carbon adsorption treatment methods, specifically, the process of chemical oxidation-ammonia stripping-coagulation and sedimentation-anaerobic-SBR-ClO2 oxidation-activated carbon adsorption to treat leachate, but the process is complicated and the treatment cost is high.

[0003] Referring to the patent with publication number CN104496103A, a method for treating landfill leachate concentrate is disclosed. The method mainly includes the following steps: the landfill leachate concentrate is sent to a material separation membrane device to remove organic matter such as humic acid in the landfill leachate concentrate, and then the landfill leachate concentrate that passes through the material separation membrane - the membrane permeate is evaporated and concentrated to obtain evaporation residue, condensate and exhaust condensate. The recovered organic matter such as humic acid is sprayed back to the incinerator after treatment or used to produce products with humic acid as raw materials, such as humic acid fertilizers; the residue produced by evaporation and concentration is sprayed back to the incinerator or landfilled after asphalt solidification; the evaporation condensate and exhaust condensate produced by evaporation and concentration are used as recycled water, thereby achieving zero-discharge treatment of landfill leachate concentrate with high treatment efficiency, but the operation and maintenance of the separation membrane device is large.

[0004] For some leachates with more dry matter, it is advisable to adopt the method of back-spraying into the incinerator for disposal. The spraying is carried out through a high-pressure device. When the heat in the leachate is lower than the combustion standard, the back-spraying is stopped; the leachate is accumulated in the pool, and when the calorific value reaches the standard again, it is sprayed again. This disposal method requires the measurement of the amount of leachate produced and the calorific value. When the leachate output is large and the heat is low, this technology is difficult to use, the treatment effect is poor, and it may even cause the incinerator to stall. The final incineration disposal is a more thorough and ideal disposal method. Therefore, it is necessary to optimize the process. After the garbage leachate is solidified and the calorific value is improved, the sludge with a certain water content is formed and then enters the incinerator for combustion.

[0005] Refer to the patent publication number CN103910481A which discloses a method for solidifying and disposing landfill leachate membrane concentrate sludge with a new type of solidifying agent. The method utilizes a covalent bond type inorganic organic composite flocculant and silicate cement to compound a new type of high-efficiency solidifying agent. The solidifying agent can form a strong solidification network to efficiently wrap and fix pollutants in the sludge during the sludge disposal process. Summary of the invention

[0006] The purpose of the present invention is to provide a landfill leachate solidification and sludge incineration treatment system, which solidifies the concentrated liquid of the landfill leachate to prepare for further stable and safe combustion, and is suitable for the solidification treatment of high-concentration landfill leachate in landfill power plants and sludge treatment projects.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A garbage leachate solidification mud incineration treatment system comprises a self-mixing mud maker, a leachate supply component, a coal powder supply component, a lime powder supply component, a curing agent supply component and a control system, wherein the self-mixing mud maker has a leachate inlet, a coal powder inlet, a lime powder inlet, a curing agent inlet and a mud outlet, a conveying member is arranged between the leachate inlet and the mud outlet in the self-mixing mud maker, the coal powder inlet, the lime powder inlet and the curing agent inlet are located at the leachate inlet and above the conveying member, the leachate supply component is connected to the leachate inlet, the coal powder supply component is connected to the coal powder inlet, the lime powder supply component is connected to the lime powder inlet, and the curing agent supply component is connected to the curing agent inlet.

[0009] Preferably, the self-mixing mud maker is provided with a leachate distribution pipe connected with the leachate inlet, and the leachate distribution pipe is provided with a plurality of liquid outlets along its length direction.

[0010] Preferably, the self-mixing mud maker is provided with a curing agent distribution pipe connected with the curing agent inlet, and the curing agent distribution pipe is provided with a plurality of curing agent outlets along its length direction.

[0011] Preferably, the self-mixing mud maker also has a sludge reflux outlet and a sludge reflux inlet, and the system also includes a sludge reflux component, the sludge reflux component includes a reflux pipe connecting the sludge reflux outlet and the sludge reflux inlet, and a reflux pump arranged on the reflux pipe, the sludge reflux outlet is located above the mud outlet, and the sludge reflux inlet is located at the leachate inlet and above the conveying member.

[0012] Preferably, a mud guard is further provided in the self-mixing mud maker, and the mud guard is located above the mud outlet.

[0013] Preferably, the conveying member is a roller arranged to be inclined from top to bottom in the vertical direction.

[0014] Further preferably, the inclination angle of the conveying member is 5°-45°

[0015] Preferably, the leachate supply assembly comprises a leachate collection tank connected to the leachate inlet, and a sewage pump arranged on a pipeline between the leachate collection tank and the leachate inlet.

[0016] Preferably, the pulverized coal supply assembly comprises a pulverized coal bin connected to the pulverized coal inlet, and a pulverized coal feeder arranged on a pipeline between the pulverized coal bin and the pulverized coal inlet.

[0017] Preferably, the lime powder supply assembly comprises a lime powder bin connected to the lime powder inlet, and a lime powder feeder arranged on a pipeline between the lime powder bin and the lime powder inlet.

[0018] Preferably, the curing agent supply assembly comprises a curing agent tank connected to the curing agent inlet, and a feeding pump arranged on a pipeline between the curing agent tank and the curing agent inlet.

[0019] Preferably, the control system is a PLC system or a DCS system.

[0020] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0021] The present invention solidifies the leachate into mud by mixing it with coal powder, lime powder and a solidifying agent. During the disposal process, a strong solidification network can be formed to efficiently wrap and fix the pollutants in the leachate. The treated sludge is put into the furnace for incineration, which effectively treats the leachate and effectively reuses the leachate. The structure is simple and the system cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 It is a structural schematic diagram of this embodiment.

[0023] in:

[0024] 1. Self-mixing mud maker; 10. Leachate inlet; 11. Coal powder inlet; 12. Lime powder inlet; 13. Curing agent inlet; 14. Sludge return outlet; 15. Sludge return inlet; 16. Mud outlet; 17. Conveying parts; 18. Mud guard; 20. Leachate collection tank; 21. Sewage pump; 22. Leachate distribution pipe; 30. Coal powder bin; 31. Coal powder feeder; 40. Lime powder bin; 41. Lime powder feeder; 50. Curing agent tank; 51. Feeding pump; 52. Curing agent distribution pipe; 60. Reflux pipe; 61. Reflux pump. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1 The garbage leachate solidification and sludge incineration treatment system shown in the figure includes a self-mixing sludge maker 1, a leachate supply component, a coal powder supply component, a lime powder supply component, a solidifying agent supply component, a sludge return component and a control system. Specifically:

[0029] The self-mixing mud maker 1 has a leachate inlet 10, a coal powder inlet 11, a lime powder inlet 12, a curing agent inlet 13, a sludge return outlet 14, a sludge return inlet 15 and a mud outlet 16. A conveying member 17 is provided between the leachate inlet 10 and the mud outlet 16 in the self-mixing mud maker 1. In this embodiment, the conveying member 17 is a roller tilted from top to bottom in the vertical direction, and its tilt angle is 5°-45°. The coal powder inlet 11, the lime powder inlet 12, and the curing agent inlet 13 are located above the leachate inlet 10 and the conveying member 17, the sludge return outlet 14 is located above the mud outlet 16, and the sludge return inlet 15 is located at the leachate inlet 10 and above the conveying member 17. In addition, a mud guard 18 is also provided in the self-mixing mud maker 1, and the mud guard 18 is located above the mud outlet 16.

[0030] The leachate supply assembly is connected to the leachate inlet 10. In this embodiment, the leachate supply assembly includes a leachate collection tank 20 connected to the leachate inlet 10, and a sewage pump 21 arranged on the pipeline between the leachate collection tank 20 and the leachate inlet 10. A leachate distribution pipe 22 connected to the leachate inlet 10 is arranged in the self-mixing mud making device 1. The leachate distribution pipe 22 is provided with a plurality of liquid outlets along its length direction, and 10-30 liquid outlets are arranged.

[0031] The pulverized coal supply assembly is connected to the pulverized coal inlet 11 . In this embodiment, the pulverized coal supply assembly includes a pulverized coal bin 30 connected to the pulverized coal inlet 11 , and a pulverized coal feeder 31 disposed on a pipeline between the pulverized coal bin 30 and the pulverized coal inlet 11 .

[0032] The lime powder supply assembly is connected to the lime powder inlet 12 . In this embodiment, the lime powder supply assembly includes a lime powder bin 40 connected to the lime powder inlet 12 , and a lime powder feeder 41 arranged on a pipeline between the lime powder bin 40 and the lime powder inlet 12 .

[0033] The curing agent supply assembly is connected to the curing agent inlet 13. In this embodiment, the curing agent supply assembly includes a curing agent tank 50 connected to the curing agent inlet 13 and a feed pump 51 arranged on the pipeline between the curing agent tank 50 and the curing agent inlet 13. A curing agent distribution pipe 52 connected to the curing agent inlet 13 is arranged in the self-mixing mud making device 1, and the curing agent distribution pipe 52 is provided with a plurality of curing agent outlets along its length direction.

[0034] The sludge return assembly includes a return pipe 60 connecting the sludge return outlet 14 and the sludge return inlet 15 , and a return pump 61 disposed on the return pipe 60 .

[0035] The control system is a PLC system or a DCS system.

[0036] The garbage leachate is taken from the leachate collection tank 20, pumped out by the sewage pump 21, and sent to the leachate distribution pipe 22 inside the self-mixing mud maker 1. The leachate impacts the coal powder in the coal powder bin 30 and the lime powder in the lime powder bin 40 falling from the upper part. The ratio of the above three is about 4~6 parts: 3~5 parts: 1 part.

[0037] The liquid curing agent is stored in a curing agent tank 50 and is delivered by a feed pump 51 to a curing agent distribution pipe 52 above the leachate distribution pipe 22 inside the self-mixing mud maker 1 to mix with the leachate. The amount of the liquid curing agent is about 0.5-1.0% of the leachate volume.

[0038] Under normal working conditions, when the ratio of leachate: coal powder: lime powder is approximately 5 parts: 4 parts: 1 part, sludge with a moisture content of about 50% is produced, which can be directly conveyed by belt to the garbage feeding system and then put into the furnace for incineration.

[0039] Under the condition of improper control of the amount of leachate, when the ratio of leachate: coal powder: lime powder is about 8 parts: 1 part: 1 part, the sludge with a moisture content of about 80% is obtained. When the amount of sludge rises to a certain height, the sludge return pump 61 can be started to return part of the sludge to the sludge return outlet 14 of the self-mixing mud maker 1, and then enter the self-mixing mud maker 1 for mixing again; at the same time, the ratio of lime powder to coal powder is adjusted to obtain sludge with a moisture content of about 40~60%, and then it is directly conveyed by a belt to the garbage feeding system for incineration in the furnace.

[0040] The waste incinerator of the waste incineration plant is designed to have a processing capacity of 2×520t / d, and the amount of landfill leachate produced is 250t / d. After reverse osmosis treatment, 40~60% of the landfill leachate still needs further treatment. After solidification treatment into sludge using this embodiment, the calorific value is about 5~7MJ / kg higher than the solid domestic waste collected by the municipal government, so it is technically feasible to incinerate it at high temperature. Finally, it is transported to the garbage feeding system and then enters the incinerator for incineration treatment. This embodiment can be put into operation regularly or continuously according to the maintenance cycle or the water level of the leachate pool.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A landfill leachate solidification and sludge incineration treatment system, characterized by: The invention comprises a self-mixing mud maker, a leachate supply component, a coal powder supply component, a lime powder supply component, a curing agent supply component and a control system. The self-mixing mud maker has a leachate inlet, a coal powder inlet, a lime powder inlet, a curing agent inlet and a mud outlet. A conveying member is arranged between the leachate inlet and the mud outlet in the self-mixing mud maker. The coal powder inlet, the lime powder inlet and the curing agent inlet are arranged at the leachate inlet and above the conveying member. The conveying member is a roller arranged obliquely from top to bottom in the vertical direction. A leachate distribution pipe connected to the leachate inlet is arranged in the self-mixing mud maker. The leachate distribution pipe has a plurality of liquid outlets along its length. A mud retaining wall is also arranged in the self-mixing mud maker. The mud guard is located above the mud outlet; the self-mixing mud maker also has a sludge reflux outlet and a sludge reflux inlet, and the system also includes a sludge reflux component, the sludge reflux component includes a reflux pipe connecting the sludge reflux outlet and the sludge reflux inlet, and a reflux pump arranged on the reflux pipe, the sludge reflux outlet is located above the mud outlet, the sludge reflux inlet is located at the leachate inlet and above the conveying member, the leachate supply component is connected to the leachate inlet, the coal powder supply component is connected to the coal powder inlet, the lime powder supply component is connected to the lime powder inlet, and the curing agent supply component is connected to the curing agent inlet.

2. The garbage leachate solidification and sludge incineration treatment system according to claim 1 is characterized by: The self-mixing mud maker is provided with a curing agent distribution pipe which is connected with the curing agent inlet, and the curing agent distribution pipe is provided with a plurality of curing agent outlets along its length direction.

3. The garbage leachate solidification and sludge incineration treatment system according to claim 1 is characterized by: The leachate supply component comprises a leachate collection tank connected to the leachate inlet, and a sewage pump arranged on a pipeline between the leachate collection tank and the leachate inlet.

4. The garbage leachate solidification and sludge incineration treatment system according to claim 1 is characterized by: The pulverized coal supply assembly comprises a pulverized coal bin connected to the pulverized coal inlet, and a pulverized coal feeder arranged on a pipeline between the pulverized coal bin and the pulverized coal inlet.

5. The garbage leachate solidification and sludge incineration treatment system according to claim 1 is characterized by: The lime powder supply assembly comprises a lime powder bin connected to the lime powder inlet and a lime powder feeder arranged on a pipeline between the lime powder bin and the lime powder inlet.

6. The garbage leachate solidification and sludge incineration treatment system according to claim 1 is characterized by: The curing agent supply assembly comprises a curing agent tank connected to the curing agent inlet and a feeding pump arranged on a pipeline between the curing agent tank and the curing agent inlet.

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