CN114890588A

CN114890588A - Efficient underground water replenishing system

Info

Publication number: CN114890588A
Application number: CN202210652797.8A
Authority: CN
Inventors: 沈城吉; 樊煜; 鲁春辉; 李世昌; 张加旭
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-08-12
Anticipated expiration: 2042-06-10
Also published as: CN114890588B

Abstract

The invention discloses an underground water efficient recharging system which comprises a reverse filtering riverbed, a deep recharging well and a reverse washing pool. The upper part of the reverse filtering riverbed is a fine material layer, the lower part of the reverse filtering riverbed is a coarse material layer, a perforation concealed pipe is embedded in the coarse material layer, and a riverbed shallow well is arranged at the bottom of the reverse filtering riverbed; the perforated concealed pipes extend out of non-perforated concealed pipes towards the left bank and the right bank of the river channel and are communicated with the deep recharging well; the backwashing pool is communicated with the deep recharging well through a recharging water outlet pipeline and is communicated with the non-perforated hidden pipe through a backwashing water outlet pipeline. The invention utilizes the reverse filter riverbed to discharge the filtered river water into the hidden pipe and replenish the deep underground water through the deep recharging well, and can also directly replenish the shallow underground water through the shallow well of the riverbed at the bottom, thereby achieving the purpose of simultaneously replenishing the shallow underground water and the deep underground water; the backwashing pool can provide a recharging water source for the deep recharging well, and can also realize backwashing on the backwashing riverbed through controlling the pipeline valve, so that the service life of underground water recharging facilities is prolonged, and long-term recharging of underground water is realized.

Description

Efficient underground water replenishing system

Technical Field

The invention relates to an underground water super-mining treatment system, in particular to an underground water efficient recharging system.

Background

The water resource distribution of the surface water of China has obvious space-time difference, and shows obvious patterns of more south, less north and less summer, rich winter and withered winter. Taking the north China as an example, the water resource amount on the per capita surface is less than 1/8 which is the average value in China, and 80% of annual precipitation is concentrated in months 7 and 8. In the face of the current situation of surface water supply shortage, the underground water exploitation strength is continuously increased since the last 70 th century, so that North China plain faces serious underground water over-exploitation problems. It is known that underground water plays important resource, geological and ecological functions, and that super-mining underground water causes ecological and geological problems such as ground settlement, ground cracks, seawater invasion and wetland degradation.

At present, the underground water super-mining in North China plain is mainly divided into shallow and deep underground water super-mining, a shallow super-mining area mainly depends on leakage and recharging of a natural river channel, an artificial wetland and the like, and a deep super-mining area depends on recharging of a deep well for recharging of the underground water and has high requirements on water quality. For this reason, shallow and deep groundwater recharge is usually performed separately. In addition, the existing recharging measures have the problems of low recharging seepage, high recharging cost, easy blockage induction and the like, and seriously restrict the recharging efficiency of the underground water.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide an efficient groundwater recharging system which can realize recharging shallow groundwater and deep groundwater simultaneously and has certain anti-clogging performance and low cost.

The technical scheme is as follows: the invention provides an underground water efficient recharging system, which is characterized in that: comprises a reverse filtering riverbed, a deep recharging well and a reverse washing pool; a coarse material layer is arranged at the bottom of the reverse filtering riverbed, a fine material layer is arranged above the coarse material layer, a perforated hidden pipe is embedded inside the coarse material layer, and a riverbed shallow well is arranged at the bottom of the reverse filtering riverbed; the perforation concealed pipe is communicated with the deep recharging well through the concealed pipe; the backwashing pool is communicated with the deep recharging well through a recharging water outlet pipeline and is communicated with the concealed pipe through a backwashing water outlet pipeline.

Preferably, the fine material layer wraps the whole river channel section, the thickness of the bottom of the fine material layer is 0.8 m-1.0 m, the bank slope ratio is not lower than 15% of the original slope ratio, the filling medium is formed by mixing river sand and coal cinder, the coal cinder structure is expanded, and the coal cinder has honeycomb-shaped pores and can better adsorb river water impurities.

Preferably, the thickness of the coarse material layer is 1.0 m-2.0 m, the filler medium is formed by mixing coarse sand, broken stone and coal slag, and the permeability coefficient of the filler medium is 1-2 orders of magnitude higher than that of the fine material layer.

Preferably, the outer pipe wall of the perforated concealed pipe is wrapped with a nylon filtering membrane, and the nylon filtering membrane is filled with substances with strong adsorption capacity, such as activated carbon, ion exchange resin, biological balls and the like, so that the water quality can be effectively purified, the peculiar smell can be removed, and the requirement of a deep well recharge water source can be met.

Preferably, the concealed conduit is a non-perforated extension of the perforated concealed conduit after it leaves the inverted filter bed with a slope drop of 1% to 0.5%.

Preferably, the deep recharging well extends to a position below the first water-resisting layer, and a gravel attaching filter is arranged at the position below the first water-resisting layer so as to prevent the deep well from being blocked.

Preferably, a plurality of ion exchange resin filter rods are arranged inside the backwashing pool; the water return and supply outlet pipeline is provided with a water stop valve; and a two-way valve is arranged at the communication position of the back washing water outlet pipeline and the concealed pipe.

The working principle is as follows: the reverse filtering riverbed filters river water through a fine material layer and a coarse material layer, the filtered river water can supplement shallow groundwater through a shallow well of the riverbed, and can also enter a deep recharging well through a hidden pipe to supplement deep groundwater after being filtered by a nylon filtering membrane; when the water quantity of the riverway is insufficient in dry seasons, the backwashing pool can provide a replenishing water source for the deep recharging well through a replenishing water outlet pipeline so as to replenish deep underground water; when the water delivery channel of the hidden pipe and the deep recharging well is closed, the backwashing pool can provide water source for the hidden pipe through the backwashing water outlet pipeline to realize the backwashing of the backwashing river bed.

Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: 1. the groundwater replenishing task of the shallow aquifer and the deep aquifer can be completed simultaneously, and the defect that the conventional replenishing measure can only replenish a single aquifer is overcome; 2. the reverse filtering riverbed can be flushed reversely, so that the blockage problem of the reverse filtering riverbed can be effectively relieved, and the long-acting recharge of underground water is ensured; 3. the river water can be purified to meet the water quality requirement of recharging deep underground water, the requirement on a high-quality water source for recharging deep underground water is reduced, and recharging cost is reduced; 4. the backwashing pool can be used for withering and storage regulation, namely water in the backwashing pool can be directly supplemented back to deep underground water in a dry period, so that the shortage of surface river water sources is made up; 5. the groundwater recharge and the back flushing of the reverse filtering riverbed can be realized by utilizing the potential energy of water without almost the help of external force.

Drawings

Fig. 1 is a schematic cross-sectional structure of the present invention.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

As shown in fig. 1, a groundwater recharging system based on riverbed arrangement comprises a reverse filtering riverbed 10, a deep recharging well 21 and a backwashing pool 31. The upper part of the reverse filtering riverbed is a fine material layer 11, and the lower part is a coarse material layer 12; the fine material layer 11 wraps the whole river channel section, the thickness of the bottom of the river channel section is 0.9 m, and the bank slope ratio is 20% of the original slope ratio; the filling medium is formed by mixing river sand and coal cinder according to the volume ratio of 2: 1; the thickness of the coarse material layer 12 is 1.5 m, the filler medium is formed by mixing coarse sand, broken stone and coal slag according to the volume ratio of 1:2:1, and the permeability coefficient of the filler medium is 2 orders of magnitude higher than that of the fine material layer. A perforated hidden pipe 13 is embedded in the coarse material layer 12, the diameter of the perforated hidden pipe 13 is 0.8m, a nylon filter membrane 15 is wrapped on the outer pipe wall, and substances with strong adsorption capacity, such as activated carbon, ion exchange resin, biological balls and the like are filled in the nylon filter membrane 15; the bottom of the coarse material layer 12 is provided with a shallow riverbed well 14, the diameter and the depth of the shallow riverbed well 14 are respectively 0.8m and 1.5 m, and the well spacing is 30 m. The perforated hidden pipe 13 is separated from the reverse filtering riverbed and extends to the left bank and the right bank of the riverway in a 1% slope, the extending part of the perforated hidden pipe is a hidden pipe 16, and the hidden pipe 16 is connected with a deep recharging well 21 of the left bank and the right bank. The backwash pool 31 is arranged between the backwash river bed 10 and the deep-layer recharge well 21, a plurality of ion exchange resin filter rods 34 are arranged in the backwash pool, the backwash pool is communicated with the deep-layer recharge well 21 through a recharge water outlet pipeline 321 provided with a water stop valve 322 and communicated with the hidden pipe 16 through a backwash water outlet pipeline 331, and a two-way valve 332 is arranged at the joint of the water outlet pipeline 331 on the side close to the river channel and the hidden pipe 16. The center line of the deep recharging well 21 is 1200 m away from the center line of the riverbed, the diameter is 1.2m, the distance is 1000m, the deep recharging well extends to the position below the first water-resisting layer 22, and a gravel attaching filter 23 is arranged at the position below the water-resisting layer.

When in specific use, the working principle of each part is as follows:

(1) the fine material layer 11 and the coarse material layer 12 of the reverse filtering riverbed 10 block and adsorb impurities in the river water, and the river water is filtered; a nylon filter membrane 15 arranged on the outer wall of the perforated concealed pipe 13 absorbs and filters impurities in the river water to purify the water and remove peculiar smell;

(2) the reverse filtering riverbed 10 directly replenishes the shallow groundwater by the filtered river water through the shallow well 14 of the bottom riverbed;

(3) the reverse filtering river bed 10 discharges the filtering river water into the perforated concealed pipe 13, and the filtering river water enters the deep recharging well 21 through the concealed pipe 16 to recharge the deep groundwater;

(4) the backwashing tank 31 accumulates rainwater, purifies the rainwater by using an ion exchange resin filter rod, and also stores a certain amount of tap water;

(5) when the water quantity of the riverway is insufficient in dry seasons, the backwashing pool 31 supplies a replenishing water source to the deep recharging well 21 through the replenishing water outlet pipeline 321 so as to replenish deep underground water;

(6) when the two-way valve 332 is adjusted to close the water delivery channel between the hidden pipe 16 and the deep recharging well 21 and open the water delivery channel between the backwashing water outlet pipeline 331 and the hidden pipe 16, the backwashing pool 31 provides water source through the backwashing water outlet pipeline 331 to realize backwashing on the backwashing river bed 10;

(7) the deep recharging well 21 is provided with a gravel filter 23 at the part below the water-resisting layer to block impurities accumulated in water and breed gathered microorganisms, so that the deep recharging well is prevented from being blocked.

Claims

1. The utility model provides an underground water high efficiency anaplerosis system which characterized in that: comprises a reverse filtering riverbed (10), a deep recharging well (21) and a backwashing pool (31); a coarse material layer (12) is arranged at the bottom of the reverse filtering riverbed (10), a fine material layer (11) is arranged above the coarse material layer (12), a perforated concealed pipe (13) is embedded inside the coarse material layer, and a riverbed shallow well (14) is arranged at the bottom of the coarse material layer; the perforation concealed pipe (13) is communicated with the deep-layer recharging well (21) through a concealed pipe (16); the backwashing pool (31) is communicated with the deep recharging well (21) through a back-replenishing water outlet pipeline (321) and is communicated with the concealed pipe (16) through a backwashing water outlet pipeline (331).

2. The underground water efficient recharging system of claim 1, wherein the fine material layer (11) wraps the whole river channel profile, the bottom thickness of the fine material layer is 0.8-1.0 m, the bank slope ratio is not lower than 15% of the original slope ratio, and the filling medium is formed by mixing river sand and coal slag.

3. The underground water high-efficiency anaplerosis system according to claim 1, characterized in that the thickness of the coarse material layer (12) is 1.0 m-2.0 m, the filler medium is formed by mixing coarse sand, broken stone and coal slag, and the permeability coefficient is 1-2 orders of magnitude higher than that of the fine material layer (11).

4. The underground water high-efficiency anaplerosis system according to claim 1, characterized in that the outer wall of the perforation hidden pipe (13) is wrapped with a layer of nylon filtering membrane (15), and the nylon filtering membrane (15) is filled with a substance with strong adsorption capacity.

5. An efficient groundwater recharge system according to claim 1, wherein the concealed pipe (16) is a non-perforated extension of the perforated concealed pipe (13) after leaving the inverted riverbed, and the slope drop is 1% -0.5%.

6. An underground water high-efficiency anaplerosis system according to claim 1, characterized in that the deep recharging well (21) extends below the first water barrier (22) and is provided with a gravel filter (23) below the first water barrier (22).

7. An underground water high-efficiency replenishing system according to claim 1, wherein a plurality of ion exchange resin filter rods (34) are arranged inside the backwashing tank (31).

8. An efficient groundwater recharge system according to claim 1, wherein the recharge water outlet pipe (321) is provided with a water stop valve (322); and a two-way valve (332) is arranged at the communication position of the back washing water outlet pipeline (331) and the concealed pipe (16).