CN112010496A

CN112010496A - High-efficient landfill leachate processing apparatus

Info

Publication number: CN112010496A
Application number: CN202010672292.9A
Authority: CN
Inventors: 陈建平; 王虎
Original assignee: Wuhan Shangshan Qingyuan Environmental Protection Technology Co ltd
Current assignee: Wuhan Shangshan Qingyuan Environmental Protection Technology Co ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2020-12-01

Abstract

The invention relates to the technical field of landfill leachate treatment, and discloses a high-efficiency landfill leachate treatment method. The treatment method comprises the steps of firstly extracting ammonia nitrogen in the landfill leachate and adjusting the ammonia nitrogen to a proper C/N ratio. And then, removing most organic matters, suspended matters, ammonia nitrogen and total nitrogen by adopting an MBR carbonization device. And finally, removing the rest organic matters, chromaticity and inorganic salts by using a nanofiltration device, and ensuring that the effluent reaches the standard. Compared with the traditional MBR, nanofiltration and reverse osmosis processes, the recovery rate of ammonia nitrogen can reach 80%, the carbon source adding amount is greatly reduced, and the operation cost is reduced.

Description

High-efficient landfill leachate processing apparatus

Technical Field

The invention relates to the technical field of landfill leachate treatment, and particularly relates to an efficient landfill leachate treatment device, which comprises high-ammonia nitrogen wastewater such as landfill leachate, kitchen waste biogas slurry and the like.

Background

With the acceleration of the urbanization process of China, the population is continuously increased, so that the domestic garbage is greatly increased. As a byproduct in the garbage disposal process, landfill leachate seriously affects the surrounding mental environment. In the existing garbage treatment facilities, pollutants in garbage leachate generated by a garbage landfill, a garbage incineration plant, a garbage transfer station and the like are complex and difficult to treat.

The landfill leachate is particularly difficult to treat as high-concentration organic wastewater with high ammonia nitrogen, high COD and low C/N ratio, and particularly, the ammonia nitrogen can reach 3000mg/L in the leachate at the later stage of a landfill. In the traditional treatment process, a large amount of carbon sources need to be added during operation of MBR, nanofiltration and reverse osmosis, and a proper carbon-nitrogen ratio is ensured, so that the operation cost is greatly increased.

Therefore, a new device is urgently needed to recycle ammonia nitrogen, reduce the content of ammonia nitrogen, adjust to a proper carbon-nitrogen ratio, and reduce the operation cost without adding a carbon source.

Disclosure of Invention

The invention aims to solve the technical problem of providing a high-efficiency landfill leachate treatment device, which can effectively remove COD, ammonia nitrogen, SS and salinity in sewage, reduce or even eliminate the addition of carbon sources, thereby reducing the operation cost and ensuring the stable standard discharge of effluent.

In order to solve the technical problems, the invention provides an efficient landfill leachate treatment device, which comprises an MDA deamination pretreatment device, an MBR carbonization device and a nanofiltration device, wherein the landfill leachate is treated by the MDA deamination pretreatment device, the MBR carbonization device and the nanofiltration device in sequence;

the MDA deamination pretreatment device is mainly used for removing ammonia nitrogen in landfill leachate, forming ammonium sulfate chemical raw materials by using sulfuric acid for absorption, and adjusting the C/N ratio of the landfill leachate;

the MBR carbonization device is mainly used for removing most organic matters, ammonia nitrogen and total nitrogen in the percolate;

the nanofiltration device is mainly used for removing pollutants which cannot be biochemically degraded and concentrating the pollutants into concentrated solution, so that the membrane permeate reaches the standard and is discharged.

Further, the MDA deamination pretreatment device adopts a hydrophobic gaseous deamination membrane to extract ammonia nitrogen, and comprises a cartridge filter, a bag filter, a deamination membrane component, an acid-base adding system, an acid circulating system and a membrane cleaning system.

Further, the MBR carbonization device removes pollutants by using a nitrification-denitrification reaction, and comprises a denitrification area, a denitrification area and an ultrafiltration membrane.

Further, the nanofiltration device comprises a filter, a nanofiltration membrane component and a membrane cleaning system.

Compared with the traditional MBR, nanofiltration and reverse osmosis process device, the C/N ratio can be adjusted to a proper ratio, the addition of a carbon source is not needed, the operation cost is reduced, the recovery rate of ammonia nitrogen can reach more than 80%, the formed ammonium sulfate byproduct can be used as a chemical raw material, and the stable and continuous standard of effluent can be ensured.

Drawings

The technical solution of the present invention will be further specifically described with reference to the accompanying drawings and the detailed description.

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The invention provides a high-efficiency landfill leachate treatment device which comprises an MDA deamination pretreatment device, an MBR carbonization device and a nanofiltration device. The MDA deamination pretreatment device is used for removing ammonia nitrogen in landfill leachate, absorbing the ammonia nitrogen with sulfuric acid to form ammonium sulfate chemical raw materials, adjusting the C/N ratio to be in line with the environmental standard range, wherein the C/N ratio of the normal standard is 15-25 times, and generally taking 20. And the MBR carbonization device is used for removing most organic matters, ammonia nitrogen and total nitrogen in the percolate. And the nanofiltration device is used for removing pollutants which cannot be biochemically degraded and concentrating the pollutants into concentrated solution, and the membrane permeate reaches the standard and is discharged. The MDA deamination pretreatment device, the MBR carbonization device and the nanofiltration device are respectively existing equipment in the field, and the respective internal structures of the MBR carbonization device and the nanofiltration device conform to the conventional structures in the prior art.

The MDA deamination pretreatment device adopts a hydrophobic gaseous deamination membrane to extract ammonia nitrogen, and comprises a security filter, a bag filter, a deamination membrane component, an acid-base adding system, an acid circulating system and a membrane cleaning system. The MBR carbonization device removes pollutants by using a nitrification-denitrification reaction, and comprises a denitrification area, a denitrification area and an ultrafiltration membrane. The nanofiltration device comprises a filter, a nanofiltration membrane component and a membrane cleaning system.

The following detailed description describes the specific steps of the device of the present invention in treating landfill leachate as follows:

(1) landfill leachate enters into MDA deamination preprocessing device through the elevator pump, adds liquid caustic soda through alkali dosing system and improves pH to about 10, filters suspended solid and sediment through cartridge filter and bag filter after that, after free ammonia nitrogen pollutant separation conversion becomes the ammonia in the leachate through the hydrophobic membrane effect, absorbs through acid sulphuric acid drawing liquid and forms ammonium sulfate fertilizer, but cyclic secondary utilizes, adjusts C/N ratio in the leachate to the national standard within range.

(2) Then the leachate enters an MBR carbonization device, and the leachate carries out a biological denitrification and decarbonization process in an A/O denitrification system, and the principle is that nitrifying microorganisms (nitrite microorganisms and nitrifying microorganisms) in a nitrification tank convert ammonia nitrogen into nitrate nitrogen (nitrate), the nitrate nitrogen is reduced into nitrogen to be released under the action of denitrification flora (facultative heterotrophic bacteria such as Alcaligenes, pseudomonas and the like existing in activated sludge) in an anoxic state of the denitrification tank, and part of organic matter (BOD) which can be biochemically degraded in the wastewater is consumed. Particles, suspended matters and the like with the particle size of more than 2.0 mu m are intercepted in the system by using an ultrafiltration membrane system, and the concentration of the suspended matters in the effluent of the MBR is ensured to be below the unit number. Meanwhile, the sludge intercepted by the ultrafiltration system can flow back to the denitrification reaction zone to ensure that the sludge age of the microorganisms reaches and far exceeds the time required by the growth of nitrifying microorganisms, and can be propagated and gathered to reach the microorganism concentration required by complete nitrification, so that the ammonia nitrogen can be completely nitrified.

(3) The effluent of the membrane bioreactor enters a nanofiltration device, is filtered by a filter and then physically intercepts pollutants which cannot be biochemically degraded by a nanofiltration membrane, and the effluent stably reaches the standard.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. The high-efficiency landfill leachate treatment device is characterized by comprising an MDA deamination pretreatment device, an MBR carbonization device and a nanofiltration device, wherein the landfill leachate is treated by the MDA deamination pretreatment device, the MBR carbonization device and the nanofiltration device in sequence;

the MDA deamination pretreatment device is used for removing ammonia nitrogen in the landfill leachate, absorbing the ammonia nitrogen with sulfuric acid to form an ammonium sulfate chemical raw material, and adjusting the C/N ratio of the landfill leachate;

the MBR carbonization device is used for removing most organic matters, ammonia nitrogen and total nitrogen in the percolate;

the nanofiltration device is used for removing pollutants which cannot be biochemically degraded and concentrating the pollutants into concentrated solution, so that the membrane permeate reaches the standard and is discharged.

2. The high efficiency landfill leachate treatment device of claim 1, wherein the MDA deamination pretreatment device extracts ammonia nitrogen by using a hydrophobic gaseous deamination membrane, and the device comprises a cartridge filter, a bag filter, a deamination membrane module, an acid-base dosing system, an acid circulation system and a membrane cleaning system.

3. The high-efficiency landfill leachate treatment device according to claim 1 or 2, wherein the MBR carbonization device removes pollutants by using a nitrification-denitrification reaction, and comprises a denitrification zone, a denitrification zone and an ultrafiltration membrane.

4. The high efficiency landfill leachate treatment device of claim 1, wherein the nanofiltration device comprises a filter, a nanofiltration membrane module and a membrane cleaning system.