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Oxygenation composite subsurface flow constructed wetland system

A technology of constructed wetland system and subsurface flow wetland, which is applied in the field of compound subsurface flow constructed wetland sewage treatment system, can solve the problems that it is difficult to ensure the dissolved oxygen content of water body and affect the treatment effect, and achieve the purpose of making up for the lack of dissolved oxygen, improving the treatment effect, and huge specific surface area Effect

Active Publication Date: 2021-02-23
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that it is difficult to ensure the dissolved oxygen content in the water body during the operation of the existing wetland system, which affects the treatment effect, the present invention provides an aerobic compound subsurface flow constructed wetland system. The method of gas technology can generate a large number of micro-nano bubbles in the water body, increase the dissolved oxygen content in the water body, and use the lanthanum-aluminum attapulgite loaded with nano-zero-valent iron as the filling layer to achieve the purpose of slow release of oxygen in the water body. Keep the content of dissolved oxygen in the system at a relatively stable level to ensure the wetland environment

Method used

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  • Oxygenation composite subsurface flow constructed wetland system

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preparation example Construction

[0033] In the present invention, the lanthanum-aluminum attapulgite loaded with zero-valent nano-iron is mainly synthesized with attapulgite and hexachloride ferric chloride with a certain particle size. The specific synthesis method and steps are as follows:

[0034] First prepare lanthanum-aluminum attapulgite: grind the natural attapulgite into powder, granulate it, place it in a muffle furnace, calcinate at 700°C for 2 hours, add 3 (0.2mol / L) and AlCl 3 ·6H 2 O (2mol / L) mixed solution, add the concentration to 4Kg / L, then shake at constant temperature for one hour, take it out, then dry and cool, then wash with ultrapure water, dry at low temperature and cool naturally.

[0035] Loading of zero-valent nano-iron: add lanthanum aluminum attapulgite and hexachloride ferric chloride into ethanol at a mass ratio of 1:1 (both adding concentrations are 40g / L), then stir for 30min, and add dropwise to a volume of ethanol volume 2 Double the sodium borohydride solution, continue ...

Embodiment 1

[0048] Such as figure 1 As shown, the total size of the oxygen-increasing composite subsurface flow constructed wetland system in this embodiment is: length×width×height: 500cm×150cm×150cm. Among them, under the condition that the oxygenation pool 2, the downflow wetland 3, the upwelling wetland 4 and the horizontal underflow wetland 5 keep the same width and height, the length of the aeration pool is 100 cm, the length of the downflow wetland is 100 cm, and the length of the uplink wetland is 100cm, and the length of the horizontal subsurface flow wetland is 200cm.

[0049] Composite subsurface flow constructed wetland filler is a mixed filler layer 13 of biochar and fine sand, a biological ceramsite filler layer 14, a lanthanum-aluminum attapulgite filler layer 15 loaded with zero-valent nano-iron, a zeolite filler layer 16, and Gravel packing layer 17, the filling height, density and particle size distribution of each layer are as follows:

[0050] In the downflow wetland...

Embodiment 2

[0058] Such as figure 1 As shown, the total size of the oxygen-increasing composite subsurface flow constructed wetland system in this embodiment is: length×width×height: 500cm×150cm×150cm. Among them, under the condition that the oxygenation pool 2, the downflow wetland 3, the upwelling wetland 4 and the horizontal underflow wetland 5 keep the same width and height, the length of the aeration pool is 100 cm, the length of the downflow wetland is 100 cm, and the length of the uplink wetland is 100cm, and the length of the horizontal subsurface flow wetland is 200cm.

[0059] Composite subsurface flow constructed wetland filler is a mixed filler layer 13 of biochar and fine sand, a biological ceramsite filler layer 14, a lanthanum-aluminum attapulgite filler layer 15 loaded with zero-valent nano-iron, a zeolite filler layer 16, and Gravel packing layer 17, the filling height, density and particle size distribution of each layer are as follows:

[0060] In the downflow wetland...

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Abstract

The invention discloses an oxygenation composite subsurface flow constructed wetland system, and belongs to the technical field of environmental protection. An aeration tank is arranged in front of awetland system, a mode of a nano-bubble aeration technology is adopted, a large number of micro-nano bubbles are generated in a water body, the content of dissolved oxygen in the water body is increased, lanthanum-aluminum attapulgite loaded with nano zero-valent iron is used as a filling layer, the purpose of slowly releasing oxygen in the water body can be achieved, the content of dissolved oxygen in the system is at a relatively stable level, and the wetland environment is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and more specifically relates to a composite subsurface flow artificial wetland sewage treatment system with added lanthanum-aluminum attapulgite loaded with nanometer zero-valent iron. Background technique [0002] Constructed wetland is a new type of sewage treatment system that is artificially planned and constructed based on the principle of natural wetland and aquatic plant sewage treatment, and effectively integrates the properties of wetland. Triple synergistic effect for water quality treatment, its ability to remove pollutants is strong, investment infrastructure costs and operating costs are low, low energy consumption, easy operation and maintenance, has been widely used in water treatment projects. [0003] In constructed wetlands, the matrix is ​​an indispensable part of the constructed wetland, and most of the physical, chemical and biological reactions in the wetla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F101/16C02F101/30
CPCC02F3/32C02F2101/16C02F2101/30Y02W10/10
Inventor 孔明高月香张毅敏苏永涛韩天伦晁建颖张圣虎苏良湖
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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