CN210505983U

CN210505983U - Landfill leachate treatment system

Info

Publication number: CN210505983U
Application number: CN201921487618.XU
Authority: CN
Inventors: 胡泊; 柴建伟; 周梦; 谢嘉瑞; 周林; 张将军
Original assignee: Cecep Beijing Energy Saving Environmental Protection Engineering Co ltd
Current assignee: Cecep Beijing Energy Saving Environmental Protection Engineering Co ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-05-12
Anticipated expiration: 2029-09-09

Abstract

The utility model provides a landfill leachate treatment system, including denitrification reactor (1), nitration reactor (2) and ultrafiltration device (3) that connect gradually, adopt the aeration equipment of the combination form of many submerged self-priming jet aerator (201) and latent aerator (202) in nitration reactor (2), latent aerator sets up in nitration reactor intermediate position, and many submerged self-priming jet aerators are then evenly arranged around nitration reactor bottom; the nitrification reactor (2) is connected with the denitrification reactor through the nitrification reflux device (4), and the ultrafiltration device (3) is connected with the denitrification reactor through the ultrafiltration reflux device (5). The utility model discloses an improve aeration process equipment among the nitration reactor, the liquid backward flow that nitrifies of control high proportion makes and nitrifies and the continuous circulation of denitrification process is in order to reduce the inhibition of nitrate nitrogen to the nitration, realizes the rational utilization of the energy, reduces energy consumption and plant maintenance cost.

Description

Landfill leachate treatment system

Technical Field

The utility model belongs to the technical field of energy-saving equipment, in particular to landfill leachate processing system.

Background

Aiming at the characteristics of high ammonia nitrogen concentration and strict ammonia nitrogen index of treated effluent of landfill leachate, a biochemical process mainly based on two-stage A/O biological denitrification is generally adopted, and the denitrification effect of the system is ensured by adjusting conditions such as carbon-nitrogen ratio, dissolved oxygen, PH, temperature and the like.

The A/O biological denitrification process is mainly based on an ammonia nitrogen biodegradation reaction process of ammoniation → nitrification → denitrification, and specifically comprises the following steps:

the ammoniation process: RCHNH₂COOH+O₂→RCOOH+CO₂+NH₃

And (3) nitration process: NH (NH)₄ ⁺+2O₂→NO₃ ^-+2H⁺+H₂O+305～440KJ/mol

And (3) denitrification process: 2NO₂ ^-+6H⁺→N₂+2H₂O+2OH^-

2NO₃ ^-+10H⁺→N₂+4H₂O+2OH^-。

According to the understanding of the A/O biological denitrification process, the denitrification effect can be ensured only by reasonably adjusting each influencing factor in the nitrification and denitrification processes.

Disclosure of Invention

The utility model aims at providing a landfill leachate processing system, through improving aeration process equipment in the nitration reactor, the high proportion nitrifies the liquid backward flow and makes and nitrify and the continuous circulation of denitrification process is to reducing the suppression of nitrate nitrogen to nitrification, realizes the rational utilization of the energy, reduces energy consumption and plant maintenance cost.

The utility model aims at realizing through the following technical scheme:

a garbage leachate treatment system comprises a denitrification reactor, a nitrification reactor and an ultrafiltration device which are sequentially connected, wherein the nitrification reactor adopts a plurality of underwater self-suction jet aerator and a latent aerator combined aeration device, the latent aerator is arranged in the middle of the nitrification reactor, and the plurality of underwater self-suction jet aerator are uniformly arranged around the bottom of the nitrification reactor; the nitrification reactor is connected with the denitrification reactor through a nitrification reflux device, and the ultrafiltration device is connected with the denitrification reactor through an ultrafiltration reflux device.

Further, a stirrer is arranged in the denitrification reactor; and each membrane pipe of the ultrafiltration device is internally provided with a group of tubular filtration membranes with the filtration pore diameter of 20 nm.

The utility model discloses compare prior art's beneficial effect does:

the garbage leachate treatment system of the utility model adopts the combination of a plurality of submerged self-suction jet aerators and a latent aerator in the nitration reactor, and only the submerged self-suction jet aerator is opened during normal working condition operation; each submerged self-suction jet aerator is provided with a jet pump, is uniformly distributed under the liquid, and selectively opens aerators and aerators in different positions according to the treatment capacity and the dissolved oxygen condition so as to achieve the aim of controlling the dissolved oxygen and the denitrification rate; compared with blast jet aeration, the utility model saves a roots blower, and the comprehensive power of the jet pump is lower than that of the blast jet aeration when the treatment load is low, thereby greatly reducing the energy consumption of the aeration system. When the load is high, especially in rich water period, need handle a large amount of filtration liquid, open many submerged self-priming jet aerator and latent aeration machine simultaneously this moment to reach the demand that satisfies the dissolved amount, reach the denitrogenation effect.

Drawings

FIG. 1 is a schematic structural view of a landfill leachate treatment system according to the present invention;

FIG. 2 is a cross-sectional view of the nitration reactor;

FIG. 3 is a top view of the nitration reactor.

Detailed Description

As shown in fig. 1, the present embodiment provides a landfill leachate treatment system, which includes a denitrification reactor 1, a nitrification reactor 2 and an ultrafiltration apparatus 3 connected in sequence, wherein a stirrer is arranged in the denitrification reactor, and the reaction in the auxiliary reactor is fully performed; as shown in fig. 2 and 3, the nitrification reactor 2 adopts four aeration devices in the form of a combination of submerged self-priming jet aerators 201 and a submerged aerator 202, the submerged aerator is arranged in the middle of the nitrification reactor, and the four submerged self-priming jet aerators are uniformly arranged around the bottom of the nitrification reactor; the nitrification reactor is connected with the denitrification reactor through a nitrification reflux device 4, and the ultrafiltration device is connected with the denitrification reactor through an ultrafiltration reflux device 5. The arrows in FIG. 3 show the gas-water mixture flow direction in the nitrification reactor.

A group of tubular filter membranes with the filter pore diameter of 20nm are arranged in each membrane tube of the ultrafiltration device 3. Each loop has a separate circulation pump, each pump providing a desired flow rate along the inner wall of the membrane tube, thereby creating turbulence, creating a greater filtration flux and avoiding clogging. The maximum ultrafiltration pressure was 4.5 bar.

The leachate after front-end treatment is mixed with the return liquid of the nitrification tank, enters the denitrification reactor 1 and is fully mixed with the denitrification sludge under the action of the submerged stirrer. The return liquid of the nitrification tank is oxidized into nitrate and nitrite by the nitrification of high-activity aerobic microorganisms, and is reduced into nitrogen to be discharged under the action of denitrification sludge in the anoxic environment of the denitrification reactor, so that the aim of denitrification is fulfilled.

The effluent of the denitrification reactor 1 directly enters the nitrification reactor 2, sewage, air and activated sludge are fully mixed and dissolved and circularly reciprocate in the nitrification reaction tank, organic matters containing elements such as carbon, nitrogen, phosphorus and the like in the sewage are effectively removed under the action of high-activity aerobic microorganisms, and ammonia nitrogen and organic nitrogen are oxidized into nitrate and nitrite.

The nitration reactor adopts jet aeration, and the required air is finished by self-absorption of a jet aerator. When the treatment load is low, the submerged self-priming jet aerator and the submerged aerator are started according to the percolate to be treated, the treatment effect can be achieved, the comprehensive power of the jet pump is lower than that of a jet pump for blast jet aeration, and the energy consumption of an aeration system is greatly reduced. When the load is high, especially in rich water period, need handle a large amount of filtration liquid, open many submerged self-priming jet aerator and latent aeration machine simultaneously this moment to reach the demand that satisfies the dissolved amount, reach the denitrogenation effect. The sludge-water mixed liquid treated by the nitration reactor enters an ultrafiltration device system through an ultrafiltration water inlet pump, under the action of an ultrafiltration reflux device 5, the active sludge with sewage flows back to the denitrification reactor 1 and then returns to the nitration reactor 1, and the residual sludge is discharged to a sludge concentration tank.

Claims

1. A landfill leachate treatment system comprises a denitrification reactor (1), a nitrification reactor (2) and an ultrafiltration device (3) which are sequentially connected, and is characterized in that the nitrification reactor (2) adopts a plurality of aeration devices in a combined form of submerged self-suction jet aerators (201) and a latent aerator (202), the latent aerator is arranged in the middle of the nitrification reactor, and the submerged self-suction jet aerators are uniformly arranged around the bottom of the nitrification reactor; the nitrification reactor (2) is connected with the denitrification reactor (1) through a nitrification reflux device (4), and the ultrafiltration device (3) is connected with the denitrification reactor (1) through an ultrafiltration reflux device (5).

2. The landfill leachate treatment system of claim 1, wherein an agitator is provided in the denitrification reactor (1).

3. The landfill leachate treatment system according to claim 1, wherein each membrane pipe of the ultrafiltration device (3) is provided with a group of tubular filtration membranes with a filtration pore size of 20 nm.