CN212102323U

CN212102323U - Device for repairing underground water by utilizing coated nano zero-valent iron

Info

Publication number: CN212102323U
Application number: CN202020416306.6U
Authority: CN
Inventors: 刘永林; 刘志阳; 笪洪斌
Original assignee: Jiangsu Ddbs Environment Remediation Co Ltd
Current assignee: Jiangsu Ddbs Environment Remediation Co Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2020-12-08
Anticipated expiration: 2030-03-27

Abstract

The utility model provides a device for repairing groundwater by utilizing coated nano zero-valent iron, which comprises a well system, an extraction system and an aeration system, wherein the well system comprises a well chamber and a well body, and the well body sequentially comprises a quartz sand layer, a mesh-shaped grid layer, a water-containing layer, a mesh-shaped grid layer, a permeable reaction layer and a mesh-shaped grid layer from outside to inside; the permeable reactive layer consists of a porous medium and coated nano zero-valent iron particles uniformly distributed in the porous medium. The utility model discloses combine permeable reactive barrier technique and circulating well technique, extract through criss-cross atmospheric quantity and carry out the processing pressure disturbance to well water with burden, the malleation that the atmospheric quantity aeration produced, make the effective area of the groundwater that this well was handled increase, improve the treatment effeciency. Underground water passes through the permeable reactive layer back and forth, the reaction is full, the pollutant removal rate in the underground water is improved, and the thickness of the permeable reactive layer can be reduced to about half of that of the existing permeable reactive wall.

Description

Device for repairing underground water by utilizing coated nano zero-valent iron

Technical Field

The utility model relates to a groundwater remediation technical field, concretely relates to utilize cladding type nanometer zero-valent iron to restore device of groundwater.

Background

The coated nano zero-valent iron is used for repairing underground water, and pollutants such as hexavalent chromium, arsenic, chlorohydrocarbon, nitrophenol and the like in the environment can be quickly removed, so that the method is one of the currently accepted underground water repairing technologies with the most development prospect.

At present, the coated nano zero-valent iron is generally filled in a permeable reaction wall, and underground water pollution feather is intercepted and repaired through the permeable reaction wall, and the treatment comprises a physical, chemical or biological action process.

The problems of the existing permeable reactive barrier technology are as follows: 1. the permeable reactive barrier is arranged between the groundwater of the upstream and the groundwater of the downstream, the groundwater of the upstream passes through the permeable reactive barrier by utilizing the natural gravity effect, so that the groundwater is purified, the process is very slow, and the time is too long; 2. in order for the contaminants in the groundwater to have sufficient reaction time with the reaction medium, the permeable reactive barrier must be of sufficient thickness.

SUMMERY OF THE UTILITY MODEL

To prior art not enough, the utility model provides an utilize cladding type nanometer zero-valent iron to restore device of groundwater, the length of time of handling groundwater is shortened by a wide margin, and the thickness of permeable reactive barrier also reduces.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a device for restoring groundwater by utilizing coated nano zero-valent iron comprises a water well system, an extraction system and an aeration system, wherein the water well system comprises a well chamber and a well body, and the well body sequentially comprises a quartz sand layer, a net-shaped grid layer, a water-containing layer, a net-shaped grid layer, a permeable reaction layer and a net-shaped grid layer from outside to inside; the permeable reactive layer consists of a porous medium and coated nano zero-valent iron particles uniformly distributed in the porous medium.

Furthermore, the aquifer is a sand layer with the thickness of 5-10 cm.

Further, the thickness of the quartz sand layer is 5 cm.

Further, the thickness of the permeable reactive layer is 25-45 cm.

Further, the porous medium is soil or quartz sand.

Further, still include medicine system, medicine system includes medicine storage tank and adds the medicine pipeline, adds the medicine pipeline and contains house steward and a plurality of bleeder, house steward intercommunication medicine storage tank is equipped with the control valve on the house steward, bleeder one end intercommunication house steward, and the other end is equipped with the shower nozzle, a plurality of shower nozzle evenly distributed in the permeable reaction layer.

Has the advantages that: the utility model discloses combine permeable reactive barrier technique and circulating well technique, have the advantage of cladding type nanometer zero-valent iron restoration groundwater technique, permeable reactive barrier technique and circulating well technique simultaneously.

The negative pressure and the positive pressure generated by the crossed large-air-volume extraction and the large-air-volume aeration are used for carrying out treatment pressure disturbance on the water in the well, and for sandy soil, the water surface of the polluted underground water has obvious change within only ten minutes of the crossed period, so that the effective area of the underground water treated by the well is increased, and the treatment efficiency is improved.

Underground water passes through the permeable reactive layer back and forth, the reaction is full, the pollutant removal rate in the underground water is improved, and the thickness of the permeable reactive layer can be reduced to about half of that of the existing permeable reactive wall.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Numbering in the figures: 1. a high pressure air pump; 2. a pressure gauge; 3. adjusting a valve; 4. an aeration head; 5. a submersible pump; 6. a shower head; 7. a pressure gauge; 8. a water sample collection control valve; 9. an extraction opening; 10. adjusting the control valve; 11. a vacuum gauge; 12. an adsorption tower; 13. a vacuum pump; 14. a medicine storage tank; 15. a control valve; 16. a well chamber; 17. a well body.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The present invention will be further explained with reference to the accompanying drawings.

As shown in figure 1, the utility model combines the circulating well technology and the permeable reactive barrier technology, and comprises an aeration system, a stripping system, an extraction system, a dosing system and a well system. An aeration system consists of a high-pressure air pump 1, a pressure gauge 2, an adjusting valve 3, an aeration head 4 and the like; the stripping system consists of a submersible pump 5, a spray header 6, a pressure gauge 7, a water sample acquisition control valve 8 and the like; an extraction system is composed of an extraction port 9, an adjusting control valve 10, a vacuum meter 11, an adsorption tower 12, a vacuum pump 13 and the like; the medicine adding system consists of a medicine storage tank 14, a control valve 15, a medicine adding pipeline and the like; the well chamber 16, the well body 17 and the like form a well system.

The well body 17 comprises a quartz sand layer, a net-shaped grating layer, a water-containing layer, a net-shaped grating layer, a permeable reaction layer and a net-shaped grating layer from outside to inside in sequence; the permeable reactive layer consists of a porous medium and coated nano zero-valent iron particles uniformly distributed in the porous medium.

The medicine storage tank 14 stores the coated nano zero-valent iron suspension. The coated nano zero-valent iron suspension is prepared by adding a coated nano zero-valent iron material into a solvent, wherein the solvent is deoxidized deionized water or 0.5-5 mmol/L NaHCO₃An aqueous solution. The coated nano zero-valent iron suspension is injected into the porous medium through a dosing pipeline to form a permeable reaction layer, and the coated nano zero-valent iron particles are retained in the porous medium.

The medicine feeding pipeline comprises a main pipe and a plurality of branch pipes, the main pipe is communicated with a medicine storage tank, a control valve is arranged on the main pipe, one end of each branch pipe is communicated with the main pipe, a spray nozzle is arranged at the other end of each branch pipe, and the plurality of spray nozzles are uniformly distributed in the permeable reaction layer. The number and the positions of the spray heads are subject to ensuring that all the groundwater can contact the coated nano zero-valent iron when passing through the permeable reaction layer.

The utility model discloses the well body is established in polluting the ground, according to soil property, pollution degree and the radius of influence of equipment to soil, with the overall arrangement of continuous plum blossom form, square or hexahedron, beat 1-N diameter not less than 100mm (the diameter can reach several meters even more than ten meters), the well that the degree of depth is greater than 1 meter (can be dark tens of meters even hectometers), N is the integer, numerical value will cover whole pollution area; the treatment of the polluted water is carried out in the well by aeration, stripping, extraction and dosing treatment processes.

The submersible pump 5 lifts well water, namely underground water, to the top of the well and then sprays the well water downwards through the spray head 6, aeration and vacuum extraction in the well increase a gas-liquid mass transfer interface, so that the gas stripping effect is enhanced, and the content of dissolved oxygen in the underground water is increased during aeration in the well, so that the polluted water is in an aerobic environment; aerating by using a high-pressure air pump, wherein the pressure range is 0.2-20 Mpa or higher, and the air supply amount is 1-300L/Min or larger; the flow range of the submersible pump 5 used for stripping is 1-300L/Min or more, and the lift range is 1-30M or more; the extraction amount of the vacuum pump 13 for extraction is 1-6000L/Min or more, and the vacuum degree is 0-0.099 Mpa.

The sealing cover is arranged on the well, the gas in the well is extracted through the vacuum extraction device, when the extraction gas amount is larger than the aeration amount, the interior of the well is in a negative pressure state, the water level in the well is lifted at the moment, the groundwater is enabled to overflow into the well body, and pollutants and the coated nano zero-valent iron react when passing through the permeable reaction layer. The aeration air quantity is improved, the extraction air quantity is reduced or stopped, so that the interior of the well is in positive pressure, the water surface in the well descends at the moment, the circulation of underground water is promoted, the influence radius of the water circulation is enlarged, and the underground water in the well passes through the permeable reaction layer again to react again. Under the condition of well sealing, the negative pressure and the positive pressure generated by crossed large-air-volume extraction and large-air-volume aeration are used for carrying out treatment pressure disturbance on the water in the well, and for sandy soil, the water surface of the underground water polluted by the crossed period only needs ten minutes to obviously change, so that the effective area of the underground water treated by the well is increased, and the treatment efficiency is improved.

Claims

1. A device for restoring groundwater by utilizing coated nano zero-valent iron comprises a well system, an extraction system and an aeration system, wherein the well system comprises a well chamber and a well body and is characterized in that the well body sequentially comprises a quartz sand layer, a mesh grid layer, an aquifer, a mesh grid layer, a permeable reaction layer and a mesh grid layer from outside to inside; the permeable reactive layer consists of a porous medium and coated nano zero-valent iron particles uniformly distributed in the porous medium.

2. The device for remediating groundwater using coated nano zero valent iron as claimed in claim 1, wherein the aquifer is a sand layer having a thickness of 5-10 cm.

3. The device for remediating groundwater using coated nano zero valent iron as claimed in claim 1, wherein the thickness of the quartz sand layer is 5 cm.

4. The device for remediating groundwater using coated nano zero valent iron as claimed in claim 1, wherein the thickness of the permeable reactive layer is 25-45 cm.

5. The device for remediating underground water using coated nano zero-valent iron as claimed in claim 1, wherein the porous medium is soil or quartz sand.

6. The device for remediating underground water by using the coated nano zero-valent iron as claimed in claim 1, further comprising a dosing system, wherein the dosing system comprises a drug storage tank and a dosing pipeline, the dosing pipeline comprises a main pipe and a plurality of branch pipes, the main pipe is communicated with the drug storage tank, the main pipe is provided with a control valve, one end of each branch pipe is communicated with the main pipe, the other end of each branch pipe is provided with a spray nozzle, and the spray nozzles are uniformly distributed in the permeable reactive layer.