CN210945110U - Landfill Leachate Treatment System - Google Patents

Abstract

This utility model relates to a landfill leachate treatment system, comprising a pretreatment subsystem and a DTRO subsystem. The pretreatment subsystem includes an aeration unit for converting dissolved hydrogen sulfide in the water into elemental sulfur, and a first filtration mechanism for retaining elemental sulfur. The first filtration mechanism is connected to both the outlet of the aeration unit and the inlet of the DTRO subsystem. The landfill leachate treatment system provided by this utility model, by using an aeration unit to aerate the leachate, converts dissolved hydrogen sulfide in the leachate into elemental sulfur. The elemental sulfur is then removed by the first filtration mechanism. This avoids contamination of online monitoring equipment due to elemental sulfur in the system effluent, ensuring the normal operation of the landfill leachate treatment system and extending the service life of the equipment.

Description

Landfill Leachate Treatment System

technical field

The utility model relates to a landfill leachate treatment system.

Background technique

In recent years, the two-stage disc tube reverse osmosis (DTRO) emergency treatment integrated device, as an emergency treatment device, is mainly used to treat the stock landfill leachate. It is widely used in landfill leachate treatment and other aspects throughout the country.

The following problems are prone to occur during its application:

(1) All biochemical indicators of the water produced by the system can meet the standards, but there is elemental sulfur in the effluent, and elemental sulfur will pollute the online monitoring equipment, causing the online monitoring to show that the effluent does not meet the standards;

(2) In order to ensure that the effluent ammonia nitrogen reaches the standard, a degassing tower unit is generally installed in the DTRO treatment system. The setting of the degassing tower unit ensures the effluent ammonia nitrogen index, but at the same time, the soluble hydrogen sulfide in the water is converted into sulfur element, which pollutes the online monitoring equipment. ;

(3) The influent water of the DTRO device is the leachate stock solution, the stock solution is sewage generated by garbage fermentation, and the concentration of suspended solids SS is high, and the raw water is in an anaerobic state, and the suspended solids SS in the stock solution form a kind of colloid under anaerobic conditions It is not easy to be removed by filtration, dosing and coagulation, resulting in frequent backwashing of the sand filter after entering the DTRO device, frequent replacement of the core filter element, shortening the water intake time, and greatly reducing the daily processing capacity.

Utility model content

The embodiments of the present utility model relate to a landfill leachate treatment system, which can at least solve some of the defects of the prior art.

The embodiments of the present utility model relate to a landfill leachate treatment system, including a pretreatment subsystem and a DTRO subsystem, wherein the pretreatment subsystem includes an aeration unit for converting soluble hydrogen sulfide in water into elemental sulfur, and a A first filter mechanism for retaining elemental sulfur, the first filter mechanism is respectively communicated with the water outlet of the aeration unit and the water inlet of the DTRO subsystem.

As one embodiment, the pretreatment subsystem further includes a coagulation unit and an air flotation unit, and the air flotation unit communicates with the water outlet of the coagulation unit.

As one embodiment, the aeration unit and the air flotation unit are combined into an integrated device, and the integrated device includes a pneumatic treatment chamber, an aerator arranged in the pneumatic treatment chamber, and an aerator arranged in the pneumatic treatment chamber. Indoor air flotation releaser.

As one of the embodiments, the coagulation chamber is separated to form a first coagulation zone and a second coagulation zone that communicate with each other, the first coagulation zone is provided with a water inlet pipe, and the second coagulation zone is connected to the The air flotation units are connected, the first coagulation zone is configured with a PAC dosing mechanism, and the second coagulation zone is configured with a PAM dosing mechanism.

As one embodiment, the first filtering mechanism includes a built-in microfiltration membrane device.

As one embodiment, the pretreatment subsystem further includes an adjustment tank, and the adjustment tank communicates with the water inlet of the aeration unit.

As one of the embodiments, the DTRO subsystem includes a first-stage DTRO processing unit and a second-stage DTRO processing unit, the first filtering mechanism communicates with the water inlet of the first-stage DTRO processing unit, and the first The concentrate line of the grade DTRO processing unit is connected to the concentrate tank.

As one of the embodiments, a mud hopper is provided at the bottom of the aeration unit, and the mud hopper communicates with the concentrated liquid tank through a sludge pipe.

As an embodiment, a second filtering mechanism, a raw water tank and a third filtering mechanism are arranged between the first filtering mechanism and the first-stage DTRO processing unit in order along the water flow direction.

As one of the embodiments, the permeate outlet of the second-stage DTRO processing unit is sequentially connected with a degassing tower and a denitrification resin processing mechanism.

The embodiments of the present utility model have at least the following beneficial effects:

In the landfill leachate treatment system provided by the utility model, by using an aeration unit to aerate the leachate, the soluble hydrogen sulfide in the leachate can be converted into elemental sulfur, and then the elemental sulfur is removed through the first filtering mechanism, which can Avoid the pollution of online monitoring equipment due to the presence of sulfur in the effluent of the system, ensure the normal operation of the landfill leachate treatment system and improve the service life of the equipment.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic diagram of the composition of a landfill leachate treatment system without a concentrated solution reduction treatment subsystem provided by an embodiment of the present utility model;

2 is a schematic diagram of the composition of a landfill leachate treatment system including a concentrated solution reduction treatment subsystem provided by an embodiment of the present invention;

3 is a schematic structural diagram of an air flotation/aeration integrated device provided by an embodiment of the present invention;

FIG. 4 is a top view of FIG. 3 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

1 and 2, an embodiment of the present invention provides a landfill leachate treatment system, including a pretreatment subsystem and a DTRO subsystem, the pretreatment subsystem includes a system for converting soluble hydrogen sulfide in water into elemental sulfur The aeration unit and the first filter mechanism 3 for intercepting elemental sulfur are respectively connected with the water outlet of the aeration unit and the water inlet of the DTRO subsystem.

Wherein, preferably, the above-mentioned first filtration mechanism 3 includes a built-in microfiltration membrane device, which can fully intercept the sulfur element in the leachate, and can filter out the suspended solids and sediments in the leachate, so as to avoid these suspended solids and sediments. Enter the DTRO subsystem to block the membrane, thereby prolonging the service life of the DTRO subsystem and reducing the amount of chemicals used in the DTRO subsystem. Of course, other filtering devices capable of removing elemental sulfur are also applicable to this embodiment.

In the landfill leachate treatment system provided in this embodiment, by using an aeration unit to aerate the leachate, the dissolved hydrogen sulfide in the leachate can be converted into elemental sulfur, and then the elemental sulfur is removed through the first filter mechanism 3, It can avoid the pollution of the online monitoring equipment due to the sulfur element in the effluent of the system, ensure the normal operation of the landfill leachate treatment system and improve the service life of the equipment.

Further preferably, the above-mentioned pretreatment subsystem further includes a coagulation unit and an air flotation unit, and the air flotation unit communicates with the water outlet of the coagulation unit. Through coagulation unit and air flotation unit treatment, impurities such as suspended solids in the leachate can be further reduced, the effluent quality can be improved, the membrane cleaning frequency of the DTRO subsystem can be reduced, scaling can be slowed down, and operating costs can be reduced. in:

The above-mentioned coagulation unit includes a coagulation chamber 201 for promoting the coagulation of the leachate, more preferably, drug-added coagulation, that is, the coagulation unit includes a drug-adding mechanism. Preferably, PAM (Polyscrylamide, polyacrylamide) and PAC (Polyaluminium Chloride, polyaluminum chloride) are added to the leachate in the coagulation chamber 201, and the coagulation effect of impurities such as suspended solids in the leachate is better. As a preference, PAM and PAC are added in partitions, and the coagulation effect is better, specifically:

As shown in FIG. 3 and FIG. 4 , the coagulation chamber 201 is divided into a first coagulation zone 2011 and a second coagulation zone 2012 that communicate with each other. The first coagulation zone 2011 is provided with a water inlet pipe, and the second coagulation zone 2012 In communication with the air flotation unit, the first coagulation zone 2011 is configured with a first dosing mechanism, and the second coagulation zone 2012 is configured with a second dosing mechanism. Wherein, it is preferable to add PAC first and then add PAM, that is, the first coagulation zone 2011 is configured with a PAC dosing mechanism, and the second coagulation zone 2012 is configured with a PAM dosing mechanism. The above-mentioned dosing mechanisms all include a pharmaceutical box and a dosing pump, and the dosing pump is communicated with the corresponding coagulation zone. Further preferably, a stirrer 2013 is provided in both the first coagulation zone 2011 and the second coagulation zone 2012, which can improve the mixing effect of the agent and the water body, thereby ensuring the coagulation effect.

The above-mentioned air flotation unit generally includes an air flotation chamber, an air flotation releaser 2021 and a slag scraper 2023 located in the air flotation chamber. The slag scraper 2023 scrapes off the suspended solids in the influent water.

Conventionally, the above-mentioned air flotation releaser 2021 is used to release the gas-water mixture, and it is correspondingly equipped with a dissolved air device (shown in the figure, not marked), and the air flotation releaser 2021 and the slag scraper 2023 are both conventional equipment in the field, The specific structure is not repeated here.

In one of the embodiments, the above-mentioned aeration unit is a separate treatment device, which includes an aeration chamber and an aerator 2022 (eg, aeration pipe, etc.) provided in the aeration chamber; along the water inlet direction, the aeration chamber The air chamber can be located in front of the air flotation chamber or after the air flotation chamber, preferably after the air flotation chamber. In another embodiment, as shown in FIGS. 3 and 4 , the aeration unit and the air flotation unit are combined into an integrated device 2 , and the integrated device 2 includes a pneumatic processing chamber 202 and a The aerator 2022 and the air flotation releaser 2021 arranged in the pneumatic treatment chamber 202 can significantly reduce the space occupied by the system and simplify the process.

In the above-mentioned pneumatic treatment chamber 202, the air flotation releaser 2021 can be arranged on the water inlet side of the pneumatic treatment chamber 202 to promote the floating of micelles, flocs, etc. The rear side of the air flotation releaser 2021. The aeration range of the aerator 2022 can cover the entire cross-section of the pneumatic processing chamber 202 . Preferably, the air flotation releaser 2021 and the aerator 2022 are set to operate intermittently. During the intermittent operation of the aerator 2022, the slag scraper 2023 can run continuously to ensure the effect of removing impurities.

In a further optimized embodiment, as shown in FIG. 3 and FIG. 4 , the above-mentioned coagulation chamber 201 is integrated with the pneumatic treatment chamber 202, the system takes up less space, the operating stroke of the leachate is shorter, and the energy consumption of the system is lower. .

Further, as shown in FIG. 3 and FIG. 4 , the above-mentioned integrated air flotation/aeration device 2 further includes a sedimentation chamber 203, in which sludge and suspended solids in the water body can be further removed; further preferably, the sedimentation chamber 203 The chamber 203 is a sloping plate sedimentation chamber 203, that is, a sloping plate is provided in the sedimentation chamber 203, which can improve the effect and efficiency of sludge and suspended matter sedimentation. A water outlet chamber 204 can be provided on the outlet side of the sedimentation chamber 203, and a water outlet pipe can be arranged on the water outlet chamber 204; wherein, the supernatant liquid from the sedimentation chamber 203 preferably flows into the water outlet chamber 204 by self-flow; in addition, the coagulation chamber 201 is connected to the pneumatic Between the treatment chambers 202 and between the pneumatic treatment chamber 202 and the sedimentation chamber 203 are preferably realized by the self-flow of the water body, which can save the energy consumption of the operation of the device.

To further optimize the above-mentioned embodiment, as shown in FIGS. 1 and 2 , the above-mentioned pretreatment subsystem further includes an adjustment tank 1, and the adjustment tank 1 is communicated with the water inlet of the aeration unit. The leachate is first adjusted by the adjustment tank 1, which can improve the effect of subsequent pretreatment.

The above-mentioned DTRO subsystem is the existing equipment in the art, for example, a two-stage dish-tube reverse osmosis (DTRO) emergency treatment integrated device is adopted. Generally, it includes a first-stage DTRO processing unit 7 and a second-stage DTRO processing unit 8 , and the first filtering mechanism 3 communicates with the water inlet of the first-stage DTRO processing unit 7 .

Further, as shown in FIGS. 1 and 2 , a second filtering mechanism 4 , a raw water tank 5 and a third filtering mechanism 6 are arranged between the first filtering mechanism 3 and the first-stage DTRO processing unit 7 along the water flow direction. The second filter mechanism 4 can use a filter device such as a basket filter; the third filter mechanism 6 can use a filter device such as a sand filter tank.

Further, as shown in Figure 1 and Figure 2, the permeate outlet of the second-stage DTRO processing unit 8 is sequentially connected with a degassing tower 9 and a denitrification resin processing mechanism 10, and the degassing tower 9 and the denitrification resin processing mechanism 10. All are composed of conventional equipment in the art, and are not described in detail here.

The above-mentioned DTRO subsystem, as the main treatment station for leachate treatment, can ensure the treatment effect of leachate and make the effluent quality of the system meet the discharge standard.

The concentrate pipe of the above-mentioned first-stage DTRO processing unit 7 is connected with a concentrate tank 11, and the concentrate produced by the first-stage DTRO processing unit 7 is discharged into the concentrate tank 11 for storage, waiting for recharge or outbound disposal.

Further, a mud hopper 2024 is provided at the bottom of the above-mentioned aeration unit, and in the air flotation/aeration integrated device 2, the mud hopper 2024 is correspondingly provided at the bottom of the pneumatic treatment chamber 202; the sulfur element produced by aeration can be mixed with the leachate. The sludge in the sludge is settled together in the sludge hopper 2024. The mud hopper 2024 is preferably communicated with the concentrated solution tank 11 through a sludge pipe, and is recharged or processed together with the concentrated solution.

In a further optimized embodiment, as shown in FIG. 2 , the above-mentioned concentrated solution is processed by a concentrated solution reduction processing subsystem, and the concentrated solution reduction processing subsystem can use a DTRO volume reduction device 13. The device 13 is conventional equipment in the field, and the specific structure is omitted here.

Similarly, sulfide/sulfur simple substance is likely to appear in the influent water of the above-mentioned DTRO reduction device 13, and the DTRO reduction device 13 is generally configured with a degassing tower unit, which easily converts soluble hydrogen sulfide in water into Sulfur element, in order to avoid sulfur element contamination on-line monitoring equipment, as shown in Figure 2, the above-mentioned concentrated solution reduction treatment subsystem also includes a concentrated solution pretreatment device, and the concentrated solution pretreatment device includes a device for dissolving hydrogen sulfide in the concentrated solution. An aeration mechanism converted into elemental sulfur and a fourth filter mechanism 12 for retaining elemental sulfur.

For the structure of the aeration mechanism, reference may be made to the above-mentioned aeration unit, for example, the above-mentioned integrated air flotation/aeration device 2 is used, which will not be repeated here.

The above-mentioned fourth filtering mechanism 12 is also preferably a built-in microfiltration membrane device.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the within the scope of protection of the present invention.

Claims (10)

1. A landfill leachate treatment system, comprising a pretreatment subsystem and a DTRO subsystem, characterized in that: the pretreatment subsystem includes an aeration unit for converting soluble hydrogen sulfide in water into elemental sulfur and an aeration unit for A first filter mechanism for retaining elemental sulfur, the first filter mechanism is respectively communicated with the water outlet of the aeration unit and the water inlet of the DTRO subsystem. 2 . The landfill leachate treatment system according to claim 1 , wherein the pretreatment subsystem further comprises a coagulation unit and an air flotation unit, and the air flotation unit communicates with the water outlet of the coagulation unit. 3 . 3 . The landfill leachate treatment system according to claim 2 , wherein the aeration unit and the air flotation unit are combined into an integrated device, and the integrated device comprises a pneumatic treatment chamber, which is arranged in the pneumatic treatment chamber. 4 . An aerator in the treatment chamber and an air flotation releaser arranged in the pneumatic treatment chamber. 4 . The landfill leachate treatment system according to claim 2 , wherein the coagulation chamber is separated into a first coagulation zone and a second coagulation zone that communicate with each other, and the first coagulation zone is on the upper A water inlet pipe is provided, the second coagulation zone is communicated with the air flotation unit, the first coagulation zone is configured with a PAC dosing mechanism, and the second coagulation zone is configured with a PAM dosing mechanism. 5. The landfill leachate treatment system according to claim 1, wherein the first filtering mechanism comprises a built-in microfiltration membrane device. 6. The landfill leachate treatment system according to any one of claims 1 to 5, wherein the pretreatment subsystem further comprises an adjustment tank, and the adjustment tank is communicated with the water inlet of the aeration unit . 7. The landfill leachate treatment system according to claim 1, wherein the DTRO subsystem comprises a first-stage DTRO treatment unit and a second-stage DTRO treatment unit, and the first filtering mechanism and the first The water inlet of the first-stage DTRO processing unit is connected, and the concentrated liquid pipe of the first-stage DTRO processing unit is connected with a concentrated liquid tank. 8 . The landfill leachate treatment system according to claim 7 , wherein a mud hopper is provided at the bottom of the aeration unit, and the mud hopper communicates with the concentrated liquid tank through a sludge pipe. 9 . 9. The landfill leachate treatment system according to claim 7, wherein a second filter mechanism, a raw water tank and a The third filter mechanism. 10 . The landfill leachate treatment system according to claim 7 , wherein the permeate outlet of the second-stage DTRO treatment unit is sequentially connected with a degassing tower and a denitrification resin treatment mechanism. 11 .

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