CN107653973B

CN107653973B - Device for storing garbage leachate

Info

Publication number: CN107653973B
Application number: CN201711070746.XA
Authority: CN
Inventors: 叶华; 叶寒影; 杨爱东; 王奕珺
Original assignee: China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
Current assignee: China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
Priority date: 2017-11-03
Filing date: 2017-11-03
Publication date: 2023-11-17
Anticipated expiration: 2037-11-03
Also published as: CN107653973A

Abstract

The application discloses a device for storing garbage leachate, which comprises a water tank, a deodorizing and vacuum-preventing assembly, a bottom sludge discharging assembly and an internal stirring assembly, wherein the water tank is connected with the deodorizing and vacuum-preventing assembly; the water tank is provided with a water inlet pipe, and the bottom of the water tank is funnel-shaped; the deodorizing and vacuum-proof assembly comprises an air inlet pipeline, an air inlet valve, an air outlet pipeline, a deodorizing fan, a vacuum meter and control equipment; the bottom mud discharging assembly comprises a mud discharging pipeline, a mud discharging valve, a back flushing pipeline, a back flushing valve and a mud pump; the internal stirring assembly comprises a water outlet pipe, a water outlet pump and n back spraying layers, wherein n is more than or equal to 1 and less than or equal to 10. The application can effectively prevent the pollution of the garbage leachate to the underground water, the stirring and dredging of the leachate are convenient, and the occupied area and the operation energy consumption of storage facilities are greatly reduced.

Description

Device for storing garbage leachate

Technical Field

The application relates to the field of garbage power generation, in particular to a device for storing garbage leachate.

Background

(1) Quality of leachate

Before the garbage in the garbage incineration power plant is incinerated, fresh garbage is placed in a garbage pit for stacking for 3-7 days for dehydration and fermentation treatment, so that the purposes of draining water and improving the heat value of the garbage are achieved, the normal operation of the garbage incinerator can be ensured, and the drained water is the main component of garbage leachate. The refuse leachate has black paint, malodor, strong pollution and great harm, and the main pollutant content is shown in table 1.

TABLE 1 Water quality of landfill leachate of conventional refuse incineration Power Generation project

CODcr(mg/L)	BOD ₅ (mg/L)	NH ₃ -N(mg/L)	Suspension (mg/L)	pH	Conductivity (ms/cm)
						40000～80000	20000～35000	500～2000	1000～4000	4.5～8.5	20～40

As can be seen from table 1:

1) The garbage leachate has complex pollutant components and great harm. As the leachate of the waste incineration power plant belongs to fresh leachate in a short period, no obvious biochemical effect (anaerobic fermentation, hydrolysis, acidification and other processes) is achieved, the organic species content is as high as hundreds of species, and the leachate mainly contains heterocyclic aromatic compounds, alcohol compounds, phenolic compounds, chlorinated aromatic compounds, aniline compounds and other refractory organic substances, and is mostly toxic and harmful substances. Of these, twenty or more substances have strong carcinogenicity and have been blacklisted in the national and U.S. EPA environmental pollutants.

2) The content of heavy metal ions and salts in the garbage leachate is high. At present, most urban household garbage in China adopts a mixed collection treatment mode, kitchen garbage, industrial waste and even toxic and harmful substances are mixed together, so that the garbage contains more heavy metal ions and salts, the heavy metal ions and the salts are brought into leachate in the leachate infiltration process, the heavy metal ions and the salts in the leachate are high in content, and the point can be seen from the fact that the conductivity of the leachate is up to 20000-40000 us/cm.

3) The garbage leachate is acidic and has strong corrosiveness. Because the leachate of the waste incineration power plant is not subjected to the processes of full anaerobic fermentation, hydrolysis and acidification, a large amount of organic acid is contained in the leachate, so that the leachate is acidic, the pH value is generally about 4-5, and the leachate has strong corrosiveness.

4) The organic pollutant and ammonia nitrogen concentration of the garbage leachate are high, and the variation range is wide. The leachate of the waste incineration power plant is used as high-concentration harmful wastewater with complex composition, high ammonia nitrogen content is one of important performance characteristics, and the ammonia nitrogen concentration is 500-1800 mg/L, and can reach 2000mg/L in some cases. The COD (chemical oxygen demand) concentration of the leachate is generally 40000-80000 mg/L, and is directly influenced by factors such as warehouse-in garbage components, rainfall, garbage pit temperature, garbage stacking time and the like, and the COD concentration of the leachate has the complexity of short-term fluctuation and long-term change.

(2) Technical scheme mainly adopted by current storage facilities

The main sources of the leachate are that the garbage contains water, the garbage is fermented to produce water in the process of stacking, and the precipitation in the process of garbage collection and transportation, the garbage discharging platform in the factory and the garbage transportation vehicle wash sewage. The leachate contains a large amount of toxic and harmful substances, and has complex water quality components, strong corrosiveness and high hazard, and the direct discharge can seriously pollute water, soil and atmosphere, thereby threatening the ecological environment and human health. At present, a large-capacity concrete pool with internal corrosion resistance is generally adopted as a leachate storage facility in a waste incineration power plant, so that leachate stays in the large-capacity concrete pool for several days to ensure that the water quality of the leachate is uniform for treatment of a subsequent biochemical system, and the concrete pool is also used as an emergency storage facility in an accident state.

The leachate storage facilities of the existing put-into-service garbage incineration power generation project all adopt internal anti-corrosion concrete pools, the total storage volume is about 3000-10000 cubic meters (determined according to garbage treatment capacity and required storage days), the specification of a conventional 3000 cubic meter storage pool is 16m multiplied by 64m multiplied by 4m (effective depth is 3 m), and the interior is generally anti-corrosion by epoxy coal tar pitch, epoxy glass fiber reinforced plastics or polyurea. Because the leachate contains a plurality of solid particulate matters and simultaneously emits a large amount of malodorous gas and a small amount of biogas, the upper part of the storage pond is provided with a gas collecting pipeline, the upper part of the pond is required to be operated for 24 hours through a deodorizing induced draft fan, so that micro negative pressure is formed on the upper part of the pond, toxic and harmful gas is ensured not to overflow, and a stirring device is sometimes arranged at the bottom of the pond to prevent bottom sludge from accumulating or to periodically perform manual dredging. The flow of a conventional garbage leachate storage pool is shown in detail in figure 1.

The refuse leachate storage facility is an underground or semi-underground reinforced concrete pool, and the main problems are as follows:

(1) There is a hidden danger of leakage of the landfill leachate and inspection is difficult. Because the amount of the leachate storage pool body is large, the length is more than 60 meters, the pool body has the possibility of uneven sedimentation, and cracks can be generated on the pool wall or the pool bottom; moreover, because the solid particles of the leachate have high content and strong corrosiveness, the abrasion to the inner wall anti-corrosion material is serious, so that the hidden danger of leakage of the leachate exists. Meanwhile, because the internal environment of the pool is bad, manual inspection cannot be performed frequently, and whether the leachate in the pool leaks is generally judged indirectly by periodically detecting the quality of groundwater outside the pool.

(2) The operation energy consumption is higher. Because the deodorizing induced draft fan of the leachate storage pool needs 24 hours to operate and has higher power, the annual power consumption of the deodorizing induced draft fan of a storage pool with 3000 cubic meters can reach 13 kilowatts.

(3) Manual dredging is difficult. The bottom of the leachate storage pool can be deposited with a large amount of sticky and malodorous sediment after long-term operation, and the sediment needs to be manually cleaned in the pool, so that the working environment is bad and the difficulty is high.

(4) The occupied area is large, and the whole arrangement of the whole factory is influenced. Because the land for planning the waste incineration power generation project is relatively small, the leachate storage pool is often the largest structure except the main factory building, the required area is large, and important consideration is needed in the overall arrangement.

Accordingly, there is an urgent need in the art for a new type of device for storing landfill leachate that can effectively solve the above problems.

Disclosure of Invention

The application aims to provide a device for storing garbage leachate, which adopts a scheme of arranging a steel anti-corrosion water tank on the ground, can effectively prevent the garbage leachate from polluting the ground water, is convenient for stirring and dredging the leachate, and greatly reduces the occupied area of storage facilities and the running energy consumption.

The application provides a device for storing garbage leachate, which comprises a water tank, a deodorizing and vacuum-preventing assembly, a bottom sludge discharging assembly and an internal stirring assembly, wherein the water tank is provided with a water inlet and a water outlet; the water tank is provided with a water inlet pipe, and the bottom of the water tank is funnel-shaped; the deodorizing and vacuum-preventing assembly comprises an air inlet pipeline, an air inlet valve, an air outlet pipeline, a deodorizing fan, a vacuum meter and control equipment, wherein the air inlet pipeline and the air outlet pipeline are respectively in air communication with the upper part of the water tank, the air inlet valve is arranged on the air inlet pipeline, the deodorizing fan is arranged on the air outlet pipeline, the vacuum meter is in air communication with the upper part of the water tank and is used for measuring the vacuum degree of air in the water tank, and the air inlet valve and the deodorizing fan are respectively in signal connection with the control equipment; the bottom sludge discharge assembly comprises a sludge discharge pipeline, a sludge discharge valve, a back flush pipeline, a back flush valve and a sludge pump, wherein the sludge discharge pipeline is in fluid communication with the bottommost part of the water tank, the sludge discharge valve is arranged on the sludge discharge pipeline, the back flush pipeline is in fluid communication with the sludge discharge pipeline, the back flush valve is arranged on the back flush pipeline, and the sludge pump is arranged on the sludge discharge pipeline and is used for pumping sludge in the water tank through the sludge discharge pipeline; the internal stirring assembly comprises a water outlet pipe, a water outlet pump and n back spraying layers, wherein n is more than or equal to 1 and less than or equal to 10, the water outlet pipe is in fluid communication with the lower part of the water tank, the water outlet pump is arranged on the water outlet pipe, the back spraying layers are positioned between the water inlet pipe and the water outlet pipe, one back spraying layer comprises 2-6 back spraying pipes, the back spraying pipes are in fluid communication with the water tank, each back spraying pipe is in fluid communication with the water outlet pipe through a flushing pipe, and garbage leachate in the water tank is stirred through water flow sprayed from the back spraying pipes.

In another preferred embodiment, in one of the backflushing layers, the backflushing pipes are located on the same cross section.

The cross section is an inclined plane penetrating through the water tank, and an acute angle alpha formed by the cross section and the central axis of the water tank is 45-90 degrees; preferably 55-90 °; more preferably 60-85.

In another preferred embodiment, in one of the backflushing layers, the backflushing pipes are distributed in a central symmetry manner with respect to the central axis of the cross section.

The central axis of the section is a straight line perpendicular to the section and passing through the intersection point of the central axis of the water tank and the section.

In another preferred embodiment, in one of the back spray layers, the nozzles of the back spray pipe have the same direction.

In another preferred embodiment, in one of the back spray layers, a part of the back spray pipes are inclined upward in the direction of the nozzle, and a part of the back spray pipes are inclined downward in the direction of the nozzle.

In another preferred embodiment, in one of the back spray layers, the number of the nozzles inclined upward and the number of the nozzles inclined downward are the same.

In another preferred embodiment, in one of the back spray layers, the back spray pipes are distributed in a central symmetry manner with respect to the central axis of the water tank, and the back spray pipes are located on the same section.

In another preferred embodiment, in one of the back spray layers, the water flow sprayed from the back spray pipe agitates the landfill leachate in the water tank to rotate clockwise or counterclockwise.

In another preferred embodiment, the direction in which the adjacent back spray layers stir the garbage leachate in the water tank is opposite.

In another preferred embodiment, the two adjacent back spraying layers with different rotation directions can be opened simultaneously or respectively, so that the garbage leachate in the water tank can be fully stirred.

In another preferred embodiment, a sub-control valve is provided on the return line and/or the flushing line.

In another preferred embodiment, the return pipe and the flushing pipe are connected by the sub-control valve.

In another preferred embodiment, in one of the back spray layers, the back spray pipes are all in an operating state (water flow is sprayed).

In another preferred embodiment, in one of the backflushing layers, the backflushing pipe portion is brought into operation.

In another preferred embodiment, a water outlet valve is arranged on the water outlet pipe.

In another preferred embodiment, the height of the back spraying layer is slightly higher than the elevation of the water outlet of the water tank and lower than the elevation of the water inlet of the water tank.

In another preferred example, a liquid level measuring instrument is arranged in the water tank and is used for measuring the liquid level height of the landfill leachate in the water tank.

In another preferred embodiment, the level gauge is an ultrasonic level gauge.

In another preferred embodiment, the ultrasonic liquid level meter is disposed at an upper portion of the water tank.

In another preferred embodiment, the fluid level gauge is a pressure fluid level gauge.

In another preferred embodiment, the ultrasonic liquid level meter is disposed at a lower portion of the water tank.

In another preferred embodiment, the internal stirring assembly comprises a controller, the controller is in signal connection with the liquid level measuring instrument, and the controller controls the working state of the back spraying layer according to the liquid level of the water tank.

In another preferred example, the controller controls the spraying-back points of 1 or more spraying-back layers to spray according to the level of the liquid in the water tank, and it is noted that the spraying-back points are all located below the level of the landfill leachate.

In another preferred embodiment, the flush pipe of one of the back spray layers is in fluid communication with the outlet pipe through a header pipe.

In another preferred embodiment, a total control valve is arranged on one of the collecting pipes, and the total control valve is used for controlling the working state of the back spraying layer.

In another preferred embodiment, n back spraying layers enter the working state at the same time.

In another preferred embodiment, n of the back spray layers do not enter the working state at the same time.

In another preferred embodiment, the collecting pipe is provided with a booster pump, and the booster pump is used for adjusting the flow rate of water flow sprayed by the return spraying pipe.

In another preferred embodiment, the controller is respectively connected with the total control valve, the sub control valve, the pressurizing pump and the water outlet pump in a signal manner, and is used for adjusting the opening degree of each valve and starting and stopping each pump.

In another preferred embodiment, the lower portion of the tank is in the shape of a cone which is slightly inclined inwardly and downwardly.

In another preferred embodiment, the sludge pump is located on a sludge truck for loading and transporting the sludge to be pumped.

In another preferred embodiment, the water tank is in a micro negative pressure state in the working state.

In another preferred embodiment, the water outlet pump is in signal connection with the control device.

In another preferred embodiment, the spout and the tank are welded together.

In another preferred embodiment, the water tank is a steel corrosion resistant water tank.

In another preferred embodiment, the deodorizing fan is a Roots fan.

In another preferred embodiment, the intake valve is a pneumatic intake valve.

In another preferred embodiment, the control device is a PLC control circuit.

In another preferred embodiment, the air in the water tank is discharged to the odor treatment system through an initial pipeline for purification treatment.

It should be noted that parameters of each back spraying layer may be different, that is, the number of back spraying pipes of each back spraying layer, the direction in which the back spraying pipes spray fluid to push the percolate to rotate, whether a pressurizing pump is provided, etc. may be different, and the above preferred embodiments may be arbitrarily combined according to actual needs.

It is understood that within the scope of the present application, the above-described technical features of the present application and technical features specifically described below (e.g., in the examples) may be combined with each other to constitute new or preferred technical solutions. And are limited to a space, and are not described in detail herein.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a conventional landfill leachate storage pool structure in the prior art.

Fig. 2 is a schematic view showing the structure of a deodorizing and vacuum preventing assembly for a water tank according to an embodiment of the present application.

Fig. 3 is a schematic view showing the construction of a tank bottom discharge assembly in one example of the present application.

Fig. 4 is a schematic view of the structure of a tank stirring system assembly in one example of the application.

In the drawings, each is indicated as follows:

1-a water tank;

2-a water inlet pipe;

3-an air inlet pipeline;

4-an intake valve;

5-an air outlet pipeline;

6-deodorizing a fan;

7-a vacuum gauge;

8-a control device;

9-a water outlet pump;

10-a water outlet pipe;

11-a sludge discharge pipeline;

12-a mud valve;

13-backwashing the pipeline;

14-a backwash valve;

15-a water outlet valve;

16-a return nozzle;

17-a flush tube;

18-split control valve.

Detailed Description

The inventor has developed a device for storing the landfill leachate for the first time through extensive and intensive research, compared with the prior art, the storage device changes the traditional storage mode of storing the landfill leachate by adopting reinforced concrete water tanks (underground and semi-underground), and stores the landfill leachate by utilizing a steel anti-corrosion water tank, and the storage device is arranged on the ground, so that the discovery and maintenance of the landfill leachate leakage are facilitated; because the water tank has good tightness, the power and the running time of the deodorizing fan are greatly reduced, and the energy consumption is obviously reduced; meanwhile, because the steel water tank is arranged on the ground, the occupied area is small, and the leachate in the water tank is very convenient to stir and the bottom is dredged, thus the application is completed on the basis.

Terminology

As used herein, the term "garbage incineration power generation" is to perform reduction, harmless and recycling treatment on garbage by high-temperature incineration, and to generate power by using the waste heat after incineration. The garbage incineration power generation is one of the most effective methods for treating urban household garbage at present, and is also the method with the highest land utilization rate.

As used herein, the term "landfill leachate" refers to a large amount of landfill leachate generated during operation of a waste incineration plant, and the main sources are water content of the waste itself, fermentation water production during waste stacking, precipitation during waste collection and transportation, and flushing sewage of a waste discharge platform in a factory and a waste transportation vehicle. The leachate contains a large amount of toxic and harmful substances, and has complex water quality components, strong corrosiveness and high hazard, and the direct discharge can seriously pollute water, soil and atmosphere, thereby threatening the ecological environment and human health.

As used herein, the term "landfill leachate storage facility" means that a waste incineration power plant must be provided with a storage facility capable of storing leachate for 7 to 10 days, and the capacity is generally 3000 to 6000 cubic meters, and the storage facility must have strong corrosion resistance, seepage resistance and stability due to strong corrosiveness and pollution of the landfill leachate.

The application provides a device for storing garbage leachate, which is a storage device with a specific structure.

In the operation process of the garbage incineration power plant, a large amount of leachate is generated, and the leachate needs to be stored in a storage facility with large capacity, strong corrosion resistance and high stability. The device can effectively prevent the pollution of the leachate to the underground water, and greatly reduce the occupied area of storage facilities and the operation energy consumption.

Typically, the apparatus for storing landfill leachate of the present application comprises a water tank, a deodorizing and vacuum-preventing assembly, a bottom sludge discharging assembly and an internal stirring assembly:

(1) Deodorizing and vacuum-proof assembly

When the concrete is adopted to prepare the leachate storage pool, the sealing performance of the concrete pool is low, so that the odor is prevented from overflowing from the manhole, the equipment hole and the like to influence the environment, and the high-power fan is mainly adopted to suck air from the top of the pool, so that a certain micro negative pressure is formed at the top of the pool to prevent the odor from overflowing. Although the steel anti-corrosion water tank has good tightness, the odor leakage phenomenon can not occur under the general condition, and when the liquid level rises due to the fact that the garbage leachate enters the water tank, the upper exhaust gas still needs to be collected and treated. In addition, because the steel anti-corrosion water tank has better tightness, when the water tank liquid level is rapidly reduced due to the fact that a large amount of waste leachate is discharged outside the water tank, if air cannot rapidly enter, vacuum can be generated in the space above the water tank liquid level, normal use of the water tank is affected, and a water tank collapse accident can occur in severe cases.

The scheme for deodorizing and preventing vacuum in steel anticorrosive water tank consists of mainly deodorizing blower, pneumatic air inlet valve, vacuum meter and control equipment, and the specific flow is shown in figure 2. When the steel anti-corrosion water tank normally operates, the inside of the steel anti-corrosion water tank is kept in a certain micro negative pressure state, the air inlet valve is closed, and the odor in the water tank is ensured not to overflow. When the water tank is filled with leachate, the liquid level rises, the air pressure at the upper part of the water tank is increased, after the air pressure at the upper part of the water tank reaches a certain positive pressure, the deodorizing fan is started to pump the air at the upper part of the water tank to the treatment system, and when the pressure in the water tank is smaller than a set negative pressure value, the deodorizing fan stops working. When the garbage leachate water outlet pump starts to work, the liquid level of the water tank is reduced, the air pressure value at the upper part of the water tank starts to be reduced and possibly forms vacuum, when the vacuum degree of the upper space of the water tank is lower than a set value, the air inlet valve is automatically opened, external air enters the water tank through the air inlet pipeline, and when the vacuum degree of the water tank returns to a normal index, the air inlet valve is closed. If the air inlet valve fails and the vacuum degree continues to increase to the warning value, the garbage leachate outlet pump stops running and gives an alarm, so that the odor in the water tank is prevented from overflowing, and the collapse of the water tank caused by the overhigh vacuum degree in the water tank is ensured.

(2) Bottom mud discharging assembly

The impurity and suspended matters in the garbage leachate are more, a large amount of sludge is precipitated after long-time storage, and if the sludge is not cleaned timely, the problems of influencing the effective volume of the water tank, blocking the water pump and the like can be caused. Considering the characteristic that the bottom area of the steel water tank is relatively small (the bottom area of a conventional 3000-cubic-meter concrete water tank is about 1000 square meters, and the bottom area of a 3000-cubic-meter steel anti-corrosion water tank is 200 square meters), the application adopts a cone bottom suction sludge discharge scheme, and the specific flow is shown in fig. 3.

The bottom of the steel anti-corrosion water tank can be made into a cone which is slightly inclined inwards and downwards, a path of mud discharging pipeline is pre-buried in the middle of the steel anti-corrosion water tank to the ground outside the water tank, and a back flushing pipeline and a corresponding valve are arranged. When the water tank normally operates, impurities and suspended matters in the leachate can gradually settle at the bottom of the water tank due to gravity, and when the sludge reaches a certain height, a sludge pumping pump truck (a sludge pumping pump and a sludge transporting truck are collectively called as a sludge pumping pump truck) can be utilized to pump the sludge settled at the bottom through a bottom sludge discharge pipe, and a backwashing pipe can ensure the smoothness of the bottom of the water tank and the sludge discharge pipe.

(3) Internal stirring assembly

At present, domestic garbage leachate treatment systems have various designs, different designs have different requirements on leachate entering the leachate treatment system, most systems require gravity precipitation of a storage system of the garbage leachate so as to reduce the content of suspended matters and impurities entering the treatment system, and some treatment systems do not need primary precipitation and allow suspended matters and impurities in the garbage leachate to enter the treatment system. The scheme of the application combines the characteristics of small occupied area and over-ground arrangement, considers that the waste leachate is sprayed back to the water tank by utilizing the water outlet pump to hydraulically stir the water tank, and the scheme is shown in fig. 4 in detail.

The leachate back spraying point for stirring can be provided with a single layer or a plurality of layers according to different elevations according to the diameter of the water tank and the output of the leachate pump; each back spraying layer can be provided with a plurality of back spraying points, and the back spraying water flow enters the water tank at a certain angle, so that the garbage leachate in the water tank can rotate clockwise or anticlockwise, and the rotation directions of the upper and lower adjacent back spraying layers are opposite to each other. The height of the back spraying layer can be slightly higher than the elevation of the water outlet of the water tank and lower than the elevation of the water inlet of the water tank. When stirring is needed, a vortex is formed in the water tank to drive the leachate in the water tank to stir, and the two groups of back spraying layers with different rotation directions can be opened simultaneously or respectively, so that the leachate in the water tank can be fully stirred. The scheme does not need to arrange stirring equipment in the water tank or increase the total amount of leachate, and can achieve good stirring effect.

The steel anti-corrosion water tank is widely used as a water treatment device (anaerobic tank) in a garbage leachate treatment system of a household garbage incineration power plant, and has the functions of enabling anaerobic bacteria to perform anaerobic reaction in a tank body, consuming a large amount of organic substances in garbage leachate and releasing methane at the same time, and arranging various partition boards in the tank, and arranging a gas-liquid separation device and a methane collecting device on the upper part. However, steel corrosion resistant tanks have not been used as a storage facility for landfill leachate. According to the functional requirements of the garbage leachate storage facility, the application innovates and designs the steel anti-corrosion water tank from aspects of deodorization, sludge discharge, internal stirring and the like.

The main advantages of the application include:

(a) The steel anti-corrosion water tank is completely arranged, if the leakage phenomenon of the leachate is very easy to find, and the basic radius of the water tank is 8-10 meters, the non-uniform settlement of the water tank is easy to prevent, so the hidden danger that the leachate pollutes the underground water can be basically avoided, and the inspection is easy.

(b) The operation energy consumption is lower. The power of the required deodorizing fan is one sixth of the water tank scheme, the running hours are one eighth of the water tank scheme, the overall electricity consumption is about 2% of the water tank scheme, and the energy consumption is greatly reduced.

(c) The bottom dredging is simple and convenient. The mud pump truck is utilized to pump away the mud deposited at the bottom through the mud discharge pipeline at the bottom of the steel anti-corrosion water tank, so that the inconvenience of manual dredging is avoided. And the back flushing pipe arranged at the same time can ensure the smoothness of the bottom of the water tank and the mud discharging pipe.

(d) The stirring effect is good. The leachate is sprayed back for stirring, and the leachate is sprayed in multiple layers and in the opposite directions, so that a good stirring effect can be achieved without adding leachate and internal mechanical stirring equipment.

(e) The occupied area is small. According to the scale of a conventional garbage incineration power plant, the storage volume of garbage leachate is generally about 6000 cubic meters, the conventional pool scheme occupies about 1200 square meters, the steel anti-corrosion water tank scheme occupies about 650 square meters, and the occupied area is saved by about 50%.

The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, the drawings are schematic representations, and thus the apparatus and device of the present application are not limited by the dimensions or proportions of the schematic representations.

It should be noted that in the claims and the description of this patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Example 1

The apparatus for storing landfill leachate of this embodiment is shown in fig. 2 to 4. The device for storing the landfill leachate of the embodiment comprises a water tank 1, a deodorizing and vacuum-preventing assembly, a bottom sludge discharging assembly and an internal stirring assembly.

Wherein, water tank 1 is steel anticorrosive water tank, and water tank 1 is equipped with inlet tube 2, and the bottom of water tank 1 is the funnel form.

As shown in fig. 2, the deodorizing and vacuum preventing assembly includes an air inlet pipe 3, an air inlet valve 4, an air outlet pipe 5, a deodorizing fan 6, a vacuum gauge 7, and a control device 8. The air inlet pipeline 3 and the air outlet pipeline 5 are respectively communicated with the air on the upper portion of the water tank 1, the air inlet valve 4 is arranged on the air inlet pipeline 3, the deodorizing fan 6 is arranged on the air outlet pipeline 5, the vacuum meter 7 is communicated with the air on the upper portion of the water tank 1 and is used for measuring the vacuum degree of the air in the water tank 1, the air inlet valve 4 and the deodorizing fan 6 are respectively connected with the control equipment 8 in a signal manner, and the control equipment 8 adjusts the opening degree of the air inlet valve 4 and the start and stop of the deodorizing fan 6 according to the vacuum degree of the air in the water tank 1. When the steel anti-corrosion water tank 1 normally operates, the inside of the steel anti-corrosion water tank 1 is kept in a certain micro negative pressure state, the air inlet valve 4 is closed, and the odor in the water tank 1 is ensured not to overflow. When the water tank 1 is filled with leachate, the liquid level rises, the air pressure at the upper part of the water tank is increased, after the air pressure at the upper part of the water tank 1 reaches a certain positive pressure, the deodorizing fan 6 is started to pump the air at the upper part of the water tank 1 to the treatment system, and when the pressure in the water tank 1 is smaller than a set negative pressure value, the deodorizing fan 6 stops working. When the garbage leachate outlet pump 9 starts to work, the liquid level of the water tank 1 is reduced, the upper air pressure value of the garbage leachate outlet pump starts to be reduced, and vacuum is possibly formed, when the vacuum degree of the upper space of the water tank 1 is lower than a set value, the air inlet valve 4 is automatically opened, external air is led into the water tank 1 through the air inlet pipeline 3, and when the vacuum degree of the water tank 1 returns to a normal index, the air inlet valve 4 is closed. If the air inlet valve 4 fails and can not be opened, and the vacuum degree continues to increase to the warning value, the garbage leachate outlet pump 9 (the outlet pump 9 is also connected with the control equipment 8 by signals) stops running and alarms, so that the odor inside the water tank 1 can be ensured not to overflow, and the collapse of the water tank due to the overhigh vacuum degree inside the water tank 1 can be ensured. The deodorizing fan 6 is a Roots fan, the air inlet valve 4 is a pneumatic air inlet valve 4, and the control equipment 8 is a PLC control circuit.

As shown in fig. 3, the bottom sludge discharge assembly includes a sludge discharge pipe 11, a sludge discharge valve 12, a backwash pipe 13, a backwash valve 14 and a sludge pump. The mud discharging pipeline 11 is in fluid communication with the bottommost part of the water tank 1, a mud discharging valve 12 is arranged on the mud discharging pipeline 11, a back flushing pipeline 13 is in fluid communication with the mud discharging pipeline 11, a back flushing valve 14 is arranged on the back flushing pipeline 13, and a mud pumping pump is arranged on the mud discharging pipeline 11 and is used for pumping mud in the water tank 1 through the mud discharging pipeline 11. The sludge discharge pipe 11 is buried in the soil and extends to the ground outside the water tank 1. The sludge pump is positioned on the sludge conveying vehicle, and the sludge conveying vehicle is used for loading and conveying the pumped sludge. Wherein, the mud pump and the sewage transporting vehicle are collectively called as a mud pump vehicle. When the water tank 1 normally operates, impurities and suspended matters in the leachate can gradually precipitate at the bottom of the water tank 1 due to gravity, and when sludge reaches a certain height, the sludge precipitated at the bottom can be pumped away by a sludge pumping truck through a sludge discharge pipe at the bottom, and the back flushing pipeline 13 can ensure the smoothness of the bottom of the water tank 1 and the sludge discharge pipe.

As shown in fig. 4, the internal stirring assembly comprises a water outlet pipe 10, a water outlet pump 9, a back spraying layer and a controller, and the water outlet pump 9 is used for carrying out hydraulic stirring on the inside of the water tank 1 by back spraying the garbage leachate. The water outlet pipe 10 is in fluid communication with the lower part of the water tank 1, the water outlet pump 9 is arranged on the water outlet pipe 10, the back spraying layers are arranged between the water inlet pipe 2 and the water outlet pipe 10, the number of the back spraying layers is 1, wherein the back spraying layers comprise 2 back spraying pipes 16, the back spraying pipes 16 are in fluid communication with the water tank 1, and the back spraying pipes 16 are fixedly welded with the water tank 1. Each spout 16 is in fluid communication with the outlet pipe 10 through a flushing pipe 17, and the waste leachate in the tank 1 is stirred by the water jet injected from the spout 16. The return pipes 16 are distributed in a central symmetry manner with respect to the central axis of the water tank 1, and the return pipes 16 are positioned on the same section. When stirring is needed, water flow sprayed from the return spray pipe 16 forms a vortex in the water tank 1 to drive leachate in the water tank 1 to stir, and the garbage leachate in the water tank 1 is stirred to rotate anticlockwise. The return pipe 16 and the flushing pipe 17 are connected by means of a separate control valve 18. The water outlet pipe 10 is provided with a water outlet valve. The height of the back spraying layer can be slightly higher than the elevation of the water outlet of the water tank 1 and lower than the elevation of the water inlet of the water tank 1. A liquid level measuring instrument is arranged in the water tank 1 and is used for measuring the liquid level height of the garbage leachate in the water tank 1. The liquid level gauge is an ultrasonic liquid level gauge, and the ultrasonic liquid level gauge is disposed at an upper portion (not shown) of the water tank 1. In another preferred embodiment, the liquid level gauge is a pressure liquid level gauge, and the ultrasonic liquid level gauge is disposed at a lower portion of the water tank. The controller is connected with the liquid level measuring instrument in a signal way, and the controller controls the working state of the back spraying layer according to the liquid level of the water tank 1. The controller is respectively connected with the sub-control valve 18 and the water outlet pump 9 in a signal way and is used for adjusting the opening degree of the sub-control valve 18 and the start and stop of the water pump. In the embodiment, good stirring effect is achieved under the condition that stirring equipment is not arranged in the water tank and the total amount of the leachate is not increased.

Example 2

The apparatus for storing landfill leachate of this embodiment is similar to that of embodiment 1, except that the number of the back spray layers of this embodiment is 4. The 4 layers of back spraying layers are positioned between the water inlet pipe and the water outlet pipe, each back spraying layer comprises 4 back spraying pipes, in one back spraying layer, the back spraying pipes are distributed in a central symmetry mode relative to the central axis of the water tank 1, and the back spraying pipes are positioned on the same section. The water flow sprayed by the return spray pipe stirs the garbage leachate in the water tank 1 to rotate clockwise or anticlockwise. The rotation directions of the garbage leachate in the adjacent back spraying layer stirring water tank 1 are opposite. The two adjacent back spraying layers with different rotation directions can be simultaneously or respectively opened, so that the garbage leachate in the water tank 1 can be fully stirred. In a back spraying layer, the back spraying pipe can be completely in a working state (water flow is sprayed out) or can be partially in the working state. The flush pipe of each of the back spray layers is in fluid communication with the outlet pipe through a header pipe. And each collecting pipe is provided with a total control valve which is used for controlling the working state of the back spraying layer. The 4 back spraying layers can enter the working state at the same time or not. The controller controls the back spraying point of the back spraying layer to spray according to the liquid level in the water tank 1. In addition, the collecting pipe is provided with a pressure pump which is used for adjusting the flow velocity of water flow sprayed out of the return spraying pipe. The controller is respectively connected with the total control valve, the branch control valve, the pressurizing pump and the water outlet pump by signals and is used for adjusting the opening degree of each valve and starting and stopping each pump. The embodiment achieves good stirring effect under the condition that stirring equipment is not arranged in the water tank 1 and the total amount of leachate is not increased, in addition, which back spraying layers enter the working state can be intelligently regulated and controlled according to the liquid level of the leachate, the number of the back spraying pipes is increased, a pressurizing pump is additionally arranged, and the stirring effect is better.

All documents mentioned in this disclosure are incorporated by reference in this disclosure as if each were individually incorporated by reference. Further, it will be appreciated that various changes and modifications may be made by those skilled in the art after reading the above teachings, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.

Claims

1. A device for storing refuse leachate, which is characterized by comprising a water tank, a deodorizing and vacuum-proof assembly, a bottom sludge discharge assembly and an internal stirring assembly;

the water tank is provided with a water inlet pipe, and the bottom of the water tank is funnel-shaped;

the deodorizing and vacuum-preventing assembly comprises an air inlet pipeline, an air inlet valve, an air outlet pipeline, a deodorizing fan, a vacuum meter and control equipment, wherein the air inlet pipeline and the air outlet pipeline are respectively in air communication with the upper part of the water tank, the air inlet valve is arranged on the air inlet pipeline, the deodorizing fan is arranged on the air outlet pipeline, the vacuum meter is in air communication with the upper part of the water tank and is used for measuring the vacuum degree of air in the water tank, and the air inlet valve and the deodorizing fan are respectively in signal connection with the control equipment;

the bottom sludge discharge assembly comprises a sludge discharge pipeline, a sludge discharge valve, a back flush pipeline, a back flush valve and a sludge pump, wherein the sludge discharge pipeline is in fluid communication with the bottommost part of the water tank, the sludge discharge valve is arranged on the sludge discharge pipeline, the back flush pipeline is in fluid communication with the sludge discharge pipeline, the back flush valve is arranged on the back flush pipeline, and the sludge pump is arranged on the sludge discharge pipeline and is used for pumping sludge in the water tank through the sludge discharge pipeline;

the internal stirring assembly comprises a water outlet pipe, a water outlet pump and n back spraying layers, wherein n is more than or equal to 1 and less than or equal to 10, the water outlet pipe is in fluid communication with the lower part of the water tank, the water outlet pump is arranged on the water outlet pipe, the back spraying layers are positioned between the water inlet pipe and the water outlet pipe, one back spraying layer comprises 2-6 back spraying pipes, the back spraying pipes are in fluid communication with the water tank, each back spraying pipe is in fluid communication with the water outlet pipe through a flushing pipe, and garbage leachate in the water tank is stirred through water flow sprayed from the back spraying pipes;

wherein, the direction of rotation of the garbage leachate in the water tank stirred by the adjacent back spraying layer is opposite;

the water tank is in a micro negative pressure state in the working state.

2. The apparatus of claim 1 wherein in one of said backflushing layers said backflushing tubes are located on the same cross-section, said backflushing tubes being centrally symmetrically distributed about a central axis of said cross-section.

3. The apparatus of claim 2 wherein in one of said backflushing layers said backflushing tubes are centrally symmetrically disposed about a central axis of said tank and said backflushing tubes are located on the same cross-section.

4. The apparatus of claim 1 wherein in one of said backset layers, a portion of the spout of said backset tube is upwardly inclined and a portion of the spout of said backset tube is downwardly inclined.

5. The apparatus of claim 4 wherein the number of upwardly inclined jets is the same as the number of downwardly inclined jets in one of the backspray layers.

6. The apparatus of claim 1, wherein in one of said backset layers, the water stream sprayed from said backset pipe agitates the landfill leachate in said tank to rotate clockwise or counterclockwise.

7. The device according to claim 1, wherein a sub-control valve is provided on the return pipe and/or the flushing pipe, the return pipe and the flushing pipe being connected by means of the sub-control valve.

8. The apparatus of claim 1 wherein in one of said backflushing layers said backflushing tubes are all in operation.

9. The apparatus of claim 1 wherein in one of said backflushing layers said backflushing tube portion is operative.

10. The device according to claim 1, wherein the water outlet pipe is provided with a water outlet valve.

11. The apparatus of claim 1, wherein the height of the back spray layer is higher than the water tank water outlet elevation and lower than the water tank water inlet elevation.

12. The apparatus of claim 1, wherein a level gauge is provided in the tank for measuring a level of landfill leachate in the tank.

13. The apparatus of claim 12, wherein the level gauge is an ultrasonic level gauge.

14. The apparatus of claim 13, wherein the ultrasonic level gauge is disposed at an upper portion of the tank.

15. The apparatus of claim 12, wherein the fluid level gauge is a pressure fluid level gauge.

16. The apparatus of claim 15, wherein the pressure level gauge is disposed in a lower portion of the tank.

17. The apparatus of claim 12, wherein the internal stirring assembly comprises a controller in signal communication with the level gauge, the controller controlling the operational state of the back spray layer based on the level of the water tank.

18. The apparatus of claim 1 wherein said flush line of one of said back spray layers is in fluid communication with said outlet line through a header.

19. The apparatus of claim 18 wherein a manifold is provided with a total control valve for controlling the operational state of the backflushing layer.

20. The apparatus of claim 1, wherein n of said backflushing layers are simultaneously in operation.

21. The apparatus of claim 1, wherein n of said backflushing layers are not simultaneously in operation.

22. The apparatus of claim 18, wherein said manifold is provided with a booster pump for regulating the flow rate of water from said spout.

23. The apparatus of claim 1, wherein the lower portion of the tank has a cone shape inclined inwardly and downwardly by a small amount.

24. The apparatus of claim 1, wherein the sludge pump is located on a sludge carrier for loading and transporting the extracted sludge.

25. The apparatus of claim 1, wherein the tank is a steel corrosion resistant tank.

26. The apparatus of claim 1, wherein the air in the tank is exhausted to the odor treatment system via an initial duct for purification.