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CDI (Capacitive Deionization) based compound type constructed wetland desalination system

A constructed wetland and composite technology, applied in the field of composite constructed wetland desalination system, can solve the problems affecting the normal operation of the constructed wetland treatment system, the wetland soil layer is easy to be blocked, and the salinization of the wetland, etc., so as to reduce secondary pollution and promote Nitrification, the effect of small specific gravity

Inactive Publication Date: 2016-05-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The wetland soil layer is easy to be blocked;
[0006] (2) The limited constructed wetland matrix is ​​easy to saturate the adsorption of pollutants, and it is not easy to desorb;
[0007] (3) It only has a good treatment effect on nitrogen, phosphorus and organic pollutants, but the desalination effect is poor, which can easily cause wetland salinization and affect the normal operation of the constructed wetland treatment system

Method used

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  • CDI (Capacitive Deionization) based compound type constructed wetland desalination system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A compound constructed wetland desalination system based on CDI. The composite constructed wetland desalination system consists of a pretreatment system and a composite vertical flow constructed wetland system. Such as figure 1As shown: the pretreatment system includes a first booster pump 23 , a flow meter 1 , a grille 22 , a CDI device 3 , a conductivity meter 21 , a water tank 20 , a second booster pump 19 and a salt drying plate 9 . The water inlet of the first booster pump 23 communicates with the sewage to be treated through the pipeline, and the water outlet of the first booster pump 23 communicates with the water inlet of the grid 22 through the pipeline, and the water inlet of the grid 22 is provided with a flowmeter 1, The water outlet of the grid 22 communicates with the water inlet of the first shut-off valve 2 through the pipeline, the water outlet of the first shut-off valve 2 communicates with the water inlet of the CDI device 3, and the water outlet of ...

Embodiment 2

[0049] A compound constructed wetland desalination system based on CDI. Except following technical parameter, all the other are with embodiment 1:

[0050] The heights of the gravel layer 17, the biological ceramsite layer 13, the zeolite layer 12 and the soil layer 11 are 15-18 cm, 32-36 cm, 32-36 cm and 15-18 cm in sequence.

[0051] In the constructed wetland, 4 partition walls are evenly arranged along the left and right directions, and the 4 partition walls divide the constructed wetland into 5 vertical flow treatment pools 7, and the distance between each partition wall is 3~6m.

[0052] The bottom plate and the top plate of the housing 28 are symmetrically opened with 2~4 installation slots, and the 2~4 installation slots are evenly arranged, and each installation slot is equipped with an insulating partition 26; the DC voltage of the power supply 30 is 1.5~1.6V.

[0053] The thickness of the insulating partition 26 is 4-6mm; the material of the insulating partition 26...

Embodiment 3

[0061] A compound constructed wetland desalination system based on CDI. Except following technical parameter, all the other are with embodiment 1:

[0062] The heights of the gravel layer 17, the biological ceramsite layer 13, the zeolite layer 12 and the soil layer 11 are 17-20cm, 35-40cm, 35-40cm and 17-20cm in sequence.

[0063] In the constructed wetland, 6 partition walls are evenly arranged along the left and right directions, and the 6 partition walls divide the constructed wetland into 7 vertical flow treatment pools 7, and the distance between each partition wall is 5-8m.

[0064] The bottom plate and the top plate of the housing 28 are symmetrically opened with 4~8 installation slots, and the 4~8 installation slots are evenly arranged, and each installation slot is equipped with an insulating partition 26; the DC voltage of the power supply 30 is 1.6~1.9V.

[0065] The thickness of the insulating partition 26 is 6-10mm; the material of the insulating partition 26 an...

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Abstract

The invention discloses a CDI (Capacitive Deionization) based compound type constructed wetland desalination system. The technical scheme of the invention is that a pretreatment system in the compounded type constructed wetland desalination system is connected with a compound vertical flow constructed wetland system by virtue of a pipeline. The pretreatment system is that: the water inlet and the water outlet of a grille (22) are communicated with the water inlet of a corresponding first pressure pump (23) and the water inlet of a CDI device (3) by virtue of pipelines, andthe water outlet of the CDI device (3) is communicated with the water inlet of a compound vertical flow constructed wetland and the water inlet of a salt drying plate (9) respectively through pipelines.A bottom impervious layer (18) of the compound vertical flow constructed wetland system is sequentially provided with a gravel layer (17), a biological ceramisite layer (13), a zeolite layer (12) and a soil layer (11) upwards, the constructedwetland is uniformly separated into 2n+1 vertical flow treatment tanks (7)along the left and right direction, and the tops and the bottoms of the vertical flow treatment tanksare communicated with one another in a staggered manner. The CDI based compound type constructed wetland desalination system disclosed by the invention is environmentallyfriendly, can effectively solve the problem of clogging and saturation of the soil layer of the wetland, and is good in nitrogen and phosphorus removal effect and desalination effect.

Description

technical field [0001] The invention belongs to the technical field of compound artificial wetland desalination system. It specifically relates to a CDI-based composite constructed wetland desalination system. Background technique [0002] Capacitive Deionization (CDI for short) desalination technology uses the electric double layer formed at the interface between sewage and electrodes to absorb ions in sewage. get regenerated. Capacitive deionization uses low voltage, does not use chemicals, and ions (salt) are not polluted and can be recycled. It is a pollution-free, low energy consumption and high value-added water treatment technology. However, capacitive deionization only has a high removal rate for salt ions, and a low removal rate for organic pollutants, nitrogen and phosphorus in sewage. Therefore, the water quality requirements for sewage treatment are often limited. [0003] Constructed wetlands use the synergistic effect of soil, microorganisms and plants to tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/281C02F1/4691C02F3/32C02F3/34C02F9/00C02F2101/105C02F2101/16C02F2101/30
Inventor 王黎雷蕾赵凤云孙杨胡宁王捷孙义程诚刘森
Owner WUHAN UNIV OF SCI & TECH
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