CN215250019U

CN215250019U - River course normal position removes arsenic defluorinating device

Info

Publication number: CN215250019U
Application number: CN202120577057.3U
Authority: CN
Inventors: 姚伟涛; 李向辉; 蒋晓松; 蔡青; 田石强; 寻勇
Original assignee: Hunan Environmental Engineering Co ltd
Current assignee: Hunan Environmental Engineering Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-12-21
Anticipated expiration: 2031-03-22

Abstract

The utility model provides a river course normal position arsenic removal defluorinating device, including the first medicine dosing device and the second medicine dosing device that are used for throwing in different medicaments, the first medicine dosing device includes first medicine feeding tank, first power spare, first medicine feeding pipeline, first safe return line, first valve, first filter and first flowmeter; the second dosing device comprises a second dosing and blending facility, a second power piece, a second dosing pipeline, a second safety return pipeline, a second valve, a second filter and a second flowmeter. The utility model discloses a first medication dosing device and second medication dosing device are respectively with two kinds of different medicaments through the river course point of offeing medicine directly throw with to the river in, can make river course raw water quality of water purify by inferior V class and reach III classes of quality of water of surface water, and remove the river course after the inferior V class pollutant of reaction sediment through the interception. The utility model discloses shortened construction period greatly, also saved construction investment cost simultaneously, be particularly useful for the emergent class project that river course arsenic, fluoride exceed standard suddenly.

Description

River course normal position removes arsenic defluorinating device

Technical Field

The utility model relates to a sewage treatment device technical field, concretely relates to river course normal position removes arsenic defluorinating device.

Background

The existing arsenic and fluorine removing devices are mainly classified into membrane separation devices, ion exchange beds, electrodialysis devices, flocculation-precipitation-filtration devices and the like. The membrane separation device can remove arsenic and fluorine in water at the same time, but the investment and operation cost of the device are too high, and the device is difficult to be applied in large scale in engineering. Although the ion exchange bed can remove arsenic and fluorine, excessive waste liquid is generated, and the subsequent treatment difficulty is increased. In addition, organic matter remaining on the ion exchange bed contaminates the ion exchange resin, greatly reducing its useful life. Electrodialysis has the defects of complex installation, incomplete arsenic and fluorine removal, low water recovery rate and the like. The flocculation-precipitation-filtration device usually needs to add a large amount of flocculating agent, and the cost of the medicament is high.

The arsenic and fluorine removal device basically introduces raw water into a corresponding reactor through ectopic positions and performs a specific arsenic and fluorine removal process so as to realize the arsenic and fluorine removal purification effect, is mainly applied to drinking water treatment, and cannot be applied to emergency projects in which arsenic and fluoride in a river channel suddenly exceed standards. In addition, the arsenic and fluorine removal device has the problems of long construction period and high investment and construction cost.

In conclusion, a riverway in-situ arsenic and fluorine removal device is urgently needed to solve the problems that the existing arsenic and fluorine removal device has long construction period and high investment and construction cost and cannot be applied to emergency projects with river arsenic and fluoride exceeding suddenly.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a river course normal position removes arsenic defluorinating device, concrete technical scheme is as follows:

the in-situ arsenic and fluorine removal device for the river comprises a first dosing device and a second dosing device, wherein the first dosing device is used for dosing different medicaments, the first dosing device comprises a first dosing tank, a first power piece, a first dosing pipeline, a first safe return pipeline, a first valve, a first filter and a first flow meter, the first dosing tank is arranged on the flat ground beside a river dam, one end of the first dosing pipeline is connected with the first dosing tank, the other end of the first dosing pipeline is communicated with a river dosing point, the first filter and the first power piece are arranged on the first dosing pipeline, the first dosing pipeline and the first dosing pipeline are sequentially arranged along the medicament flow direction, the first flow meter is arranged at one end, close to the river dosing point, of the first dosing pipeline, one end of the first safe return pipeline is communicated with the first dosing pipeline, the other end of the first dosing pipeline is communicated with the first dosing tank, the number of the first valves is multiple, and are dispersedly arranged on the first dosing pipeline and the first safety return pipeline;

the second dosing device comprises a second dosing and allocating facility, a second power piece, a second dosing pipeline, a second safety return pipeline, a second valve, a second filter and a second flow meter, wherein the second dosing and allocating facility is arranged on a flat ground beside a river dam, one end of the second dosing pipeline is connected with the second dosing and allocating facility, the other end of the second dosing pipeline is communicated with a river dosing point, the second filter and the second power piece are both arranged on the second dosing pipeline and are sequentially arranged along the flow direction of the medicament, the second flow meter is arranged at one end, close to the river dosing point, of the second dosing pipeline, one end of the second safety return pipeline is communicated with the second dosing pipeline, the other end of the second safety return pipeline is communicated with the second dosing pipeline, the number of the second valves is multiple, and the second dosing pipeline and the second safety return pipeline are dispersedly arranged.

Preferably, the first dosing device and the second dosing device are arranged in a row along the length direction of the river dam, and the dosing points of the first dosing device and the second dosing device in the river are located at the same position in the river.

Preferably, the first dosing pipeline comprises a first main pipeline, a second main pipeline and at least two groups of first branch pipelines which are arranged in parallel, the first main pipeline is used for communicating the first dosing tank with the first branch pipelines which are connected in parallel, the number of the first main pipelines is equal to that of the first dosing tanks, the second main pipeline is used for communicating the first branch pipelines which are connected in parallel with the dosing points of the river channel, the first flowmeter is arranged on the second main pipeline, and each first branch pipeline is provided with a first filter and a first power part;

one end of the first safety return pipeline is communicated with each first branch pipeline in the first administration pipelines;

the second dosing pipeline comprises a third main pipeline, a fourth main pipeline and at least two groups of second branch pipelines which are arranged in parallel, the third main pipeline is used for communicating a second dosing and allocating facility and the second branch pipelines which are connected in parallel, the number of the third main pipeline is equal to that of the second dosing and allocating facility, the fourth main pipeline is used for communicating the second branch pipelines which are connected in parallel and a river channel dosing point, the second flowmeter is arranged on the fourth main pipeline, and a second filter and a second power part are arranged on each second branch pipeline;

one end of the second safety return line is communicated with each second branch line in the second administration line.

Preferably, the first valve comprises a plurality of first ball valves, a first back pressure valve, a first check valve and a first safety valve, the first ball valves are respectively arranged on the first main pipeline, the second main pipeline and each first branch pipeline, each first branch pipeline is provided with the first back pressure valve and the first check valve which are sequentially arranged along the flow direction of the medicament and are both positioned at the downstream section of the first power part on the first branch pipeline, and the first safety valve is arranged on the first safety return pipeline;

the second valve includes second ball valve, second back pressure valve, second check valve and second relief valve, the quantity of second ball valve is a plurality of, and sets up respectively on No. three main lines, No. four main lines and each second branch road, every all be equipped with second back pressure valve and second check valve on the second branch road, the two sets gradually along the medicament flow direction, and the two all is located the downstream section of second power spare on the second branch road of place, the second relief valve sets up on second safety return line.

Preferably, the first chemical dosing device further comprises a plurality of first pulse dampers, and the first pulse dampers are correspondingly arranged on the first branch pipelines one by one and are respectively located between the first power piece and the first back pressure valve on the first branch pipeline;

the second dosing device further comprises a plurality of second pulse dampers, wherein the second pulse dampers are correspondingly arranged on the second branch pipelines one by one and are respectively positioned between the second power parts and the second back pressure valves on the second branch pipelines.

Preferably, the first chemical dosing device further comprises a liquid chemical tank truck and a chemical discharge tank located on the river dam, the chemical discharge tank is respectively communicated with the liquid chemical tank truck and the first chemical dosing tank through a pipeline, the height of the first chemical dosing tank is lower than that of the chemical discharge tank, and the first chemical dosing tanks are multiple and are arranged in parallel.

Preferably, the second chemical dosing device further comprises a third power part, a water inlet pipeline, an emptying pipeline and an overflow pipeline, the third power part is arranged on the water inlet pipeline, one end of the water inlet pipeline is communicated with the second chemical dosing and blending facility, the other end of the water inlet pipeline is communicated with river water in the river channel, the chemical inflow ends of the emptying pipeline and the overflow pipeline are both communicated with the second chemical dosing and blending facility, and the chemical outflow ends of the emptying pipeline and the overflow pipeline are both communicated with an external collecting device.

Preferably, the water inlet pipeline is provided with a third ball valve and a third check valve which are sequentially arranged along the water inlet direction of the water inlet pipeline, and the emptying pipeline is also provided with a fourth ball valve.

Preferably, the second dosing and blending facility is an integrated drug dissolving machine.

Preferably, the first power part, the second power part and the third power part are all water pumps, the first flowmeter and the second flowmeter are both electromagnetic flowmeters, and the first filter and the second filter are both Y-shaped filters.

Use the technical scheme of the utility model, following beneficial effect has:

the utility model discloses in river course normal position remove arsenic and remove fluorine device, adopt the mode of handling river normal position, remove arsenic respectively through first dosing device and second dosing device and remove fluorine adsorbent with two kinds of differences and directly throw to the river through the river course point of offeing medicine, two kinds of differences remove arsenic and remove fluorine adsorbent and use in the river complex and can make the former water quality of water of river course reach III class quality of water of surface water by bad V class (arsenic, fluoride are bad V class) high-efficient purification, and remove the river course after the bad V class pollutant of reaction sediment through the interception. The utility model discloses remove arsenic defluorinating adsorbent with the help of the high efficiency and successfully purify to surface water III class quality of water by inferior V class to certain river course raw water quality of water in Chenzhou city in Hunan province. Compare in current remove arsenic defluorinating device to the dystopy processing mode of water, the utility model discloses shorten construction period greatly, also saved construction investment cost simultaneously, be particularly useful for the emergent class project that river course arsenic, fluoride exceed standard suddenly.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic view of the first medication administration device according to embodiment 1 (the direction of arrows in fig. 1 indicates the direction of flow of the medication);

fig. 2 is a schematic view of the second medication administration device according to embodiment 1 (the direction of the arrow in fig. 2 indicates the flow direction of the medication);

wherein, 1, the first medicine adding tank, 2, the first power piece, 3, the first medicine adding pipeline, 3.1, the first main pipeline, 3.2, the second main pipeline, 3.3, the first branch pipeline, 4, the first safe return pipeline, 5, the first filter, 6, the first flowmeter, 7, the second medicine adding and mixing facility, 8, the second power piece, 9, the second medicine adding pipeline, 9.1, the third main pipeline, 9.2, the fourth main pipeline, 9.3, the second branch pipeline, 10, the second safe return pipeline, 11, the second filter, 12, the second flowmeter, 13, the first ball valve, 14, the first back pressure valve, 15, the first check valve, 16, the first safety valve, 17, the second ball valve, 18, the second back pressure valve, 19, the second check valve, 20, the second safety valve, 21, the first pulse damper, 22, the second pulse damper, 23, the liquid medicine tank, 24, the discharge tank truck, 25, 24, 25, The third power part, 26, the water inlet pipeline, 26.1, the third ball valve, 26.2, the third check valve, 27, the emptying pipeline, 27.1, the fourth ball valve, 28, the overflow pipeline, 29 and the river course dosing point.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.

Example 1:

referring to fig. 1-2, an in-situ arsenic and fluorine removing device for a river comprises a first medication dosing device and a second medication dosing device for dosing different drugs, referring to fig. 1, the first medication dosing device comprises a first medication dosing tank 1, a first power member 2, a first medication dosing pipeline 3, a first safety return pipeline 4, a first valve, a first filter 5 and a first flow meter 6, the first medication dosing tank 1 is arranged on a flat ground beside a river dam, one end of the first medication dosing pipeline 3 is connected with the first medication dosing tank 1, the other end of the first medication dosing pipeline is communicated with a river dosing point 29, the first filter 5 and the first power member 2 are both arranged on the first medication dosing pipeline 3 and are arranged in sequence along the flow direction of drugs, the first flow meter 6 is arranged at one end of the first medication dosing pipeline 3 close to the river dosing point 29, one end of the first safety return pipeline 4 is communicated with the first medication dosing pipeline 3, the other end of the first dosing tank is communicated with the first dosing tank 1, and a plurality of first valves are dispersedly arranged on the first dosing pipeline 3 and the first safety return pipeline 4;

referring to fig. 2, the second medication dosing apparatus comprises a second medication dosing facility 7, a second power unit 8, a second medication dosing line 9, a second safety return line 10, a second valve, a second filter 11 and a second flow meter 12, the second dosing and blending facility 7 is arranged on a flat ground beside the river dam, one end of the second dosing pipeline 9 is connected with the second dosing and blending facility 7, and the other end is communicated with a riverway drug administration point 29, the second filter 11 and the second power piece 8 are both arranged on a second drug administration pipeline 9, and the two are arranged in sequence along the flow direction of the medicament, the second flow meter 12 is arranged at one end of the second medication pipeline 9 close to the medication point 29 of the river channel, one end of the second safety return pipeline 10 is communicated with the second medication pipeline 9, and the other end is communicated with a second dosing and blending facility 7, and the number of the second valves is multiple and is dispersedly arranged on the second dosing pipeline 9 and the second safety return pipeline 10.

The first dosing device and the second dosing device are arranged in the length direction of the river dam, and the river dosing points 29 of the first dosing device and the second dosing device are located at the same position in the river, so that two medicaments respectively dosed by the first dosing device and the second dosing device are rapidly and efficiently mixed in river water, and the arsenic and fluorine removal effects are improved.

Referring to fig. 1, the first chemical dosing pipeline 3 includes a first main pipeline 3.1, a second main pipeline 3.2 and at least two groups of first branch pipelines 3.3 arranged in parallel, the first main pipeline 3.1 is used for communicating a first chemical dosing tank 1 and each first branch pipeline 3.3 connected in parallel, the number of the first main pipeline 3.1 is equal to that of the first chemical dosing tank 1, and is 3, the second main pipeline 3.2 is used for communicating each first branch pipeline 3.3 connected in parallel with a river course chemical dosing point 29, the first flowmeter (6) is arranged on the second main pipeline 3.2, and each first branch pipeline 3.3 is provided with a first filter 5 and a first power component 2;

one end of the first safety return line 4 is communicated with each first branch line 3.3 in the first administration line 3;

referring to fig. 2, the second chemical dosing pipeline 9 includes a third main pipeline 9.1, a fourth main pipeline 9.2 and at least two groups of second branch pipelines 9.3 arranged in parallel, the third main pipeline 9.1 is used for communicating the second chemical dosing and blending facility 7 and each second branch pipeline 9.3 connected in parallel, the number of the third main pipeline 9.1 is equal to the number of the second chemical dosing and blending facility 7, and is 1, the fourth main pipeline 9.2 is used for communicating each second branch pipeline 9.3 connected in parallel and a river course chemical dosing point 29, the second flowmeter 12 is arranged on the fourth main pipeline 9.2, and each second branch pipeline 9.3 is provided with a second filter 11 and a second power component 8;

one end of the second safety return line 10 communicates with each of the second branch lines 9.3 of the second administration lines 9.

Referring to fig. 1, the first valve includes a plurality of first ball valves 13, a first backpressure valve 14, a first check valve 15 and a first safety valve 16, the first ball valves 13 are respectively arranged on a first main pipeline 3.1, a second main pipeline 3.2 and each first branch pipeline 3.3, each first branch pipeline 3.3 is provided with the first backpressure valve 14 and the first check valve 15, the first backpressure valve and the first check valve are sequentially arranged along the flow direction of the medicament and are both located at a downstream section of the first power element 2 on the first branch pipeline 3.3, and the first safety valve 16 is arranged on the first safety return pipeline 4;

referring to fig. 2, the second valves include a plurality of second ball valves 17, a plurality of second back pressure valves 18, a plurality of second check valves 19, and a plurality of second safety valves 20, the second ball valves 17 are respectively disposed on a third main pipeline 9.1, a fourth main pipeline 9.2, and each second branch pipeline 9.3, each second branch pipeline 9.3 is provided with a second back pressure valve 18 and a second check valve 19, which are sequentially disposed along a flow direction of the chemical, and both of the second back pressure valves and the second check valves are disposed on a downstream section of the second power element 8 on the second branch pipeline 9.3, and the second safety valves 20 are disposed on the second safety return pipeline 10.

Referring to fig. 1, the first medication dosing device further includes a plurality of first pulse dampers 21, and the first pulse dampers 21 are correspondingly disposed on the first branch pipelines 3.3 one by one, and are respectively located between the first power component 2 and the first back pressure valve 14 on the first branch pipeline 3.3;

referring to fig. 2, the second medication dosing device further includes a plurality of second pulse dampers 22, and the second pulse dampers 22 are disposed on the second branch lines 9.3 in a one-to-one correspondence manner, and are respectively located between the second dynamic piece 8 and the second back pressure valve 18 on the second branch line 9.3. The first pulse damper 21 and the second pulse damper 22 in embodiment 1 are provided to damp fluctuations in the pressure and flow rate of the drug, and to provide a certain buffering function.

Referring to fig. 1, the first chemical dosing device further comprises a liquid chemical tank truck 23 and a chemical discharge tank 24 located on a river dam, the chemical discharge tank 24 is respectively communicated with the liquid chemical tank truck 23 and the first chemical discharge tank 1 through a pipeline, the height of the first chemical discharge tank 1 is lower than that of the chemical discharge tank 24, so that the chemical can be rapidly added into the first chemical discharge tank 1 by the chemical discharge tank 24 under an unpowered condition, the first chemical discharge tanks 1 are multiple in number and arranged in parallel, and timely supply of a large amount of chemicals is ensured in emergency projects where arsenic and fluoride in river suddenly exceed standards.

Referring to fig. 2, the second chemical dosing device further includes a third power member 25, a water inlet pipe 26, an emptying pipe 27 and an overflow pipe 28, the third power member 25 is disposed on the water inlet pipe 26, one end of the water inlet pipe 26 is communicated with the second chemical dosing and blending facility 7, and the other end is communicated with the river water in the river, the chemical inflow ends of the emptying pipe 27 and the overflow pipe 28 are both communicated with the second chemical dosing and blending facility 7, and the chemical outflow ends are both communicated with an external collection device.

Referring to fig. 2, a third ball valve 26.1 and a third check valve 26.2 are disposed on the water inlet pipe 26, and are sequentially disposed along the water inlet direction of the water inlet pipe 26, and a fourth ball valve 27.1 is disposed on the air release pipe 27.

The second medicine adding and blending facility 7 is an integrated medicine dissolving machine.

The first power part 2, the second power part 8 and the third power part 25 are all water pumps, the first flowmeter 6 and the second flowmeter 12 are all electromagnetic flowmeters, and the first filter 5 and the second filter 11 are all Y-shaped filters.

Example 1 when in use, two different arsenic and fluorine removal adsorbents are respectively added into the first dosing device and the second dosing device, and the arsenic and fluorine removal effects are achieved by using two different agents in combination. The medicament added in the first dosing device is a liquid medicament A (with the mass concentration of 30%), the medicament added in the second dosing device is a solid medicament B, the medicament B is directly added into the second dosing and preparing facility 7, and river water is introduced into the second dosing and preparing facility 7 through the water inlet pipeline 26, so that the medicament B is fully dissolved in the introduced river water and is uniformly mixed to obtain a diluted medicament B (with the mass concentration of 1 per mill). The adding volume ratio of the agent A to the agent B to river water in the river channel is 1:1000, and the two agents are added to a river channel adding point 29 at the same position, so that the two agents are quickly and efficiently mixed in the river water, the arsenic and fluorine removal effects are improved, and the specific effects are detailed in table 1. After the two medicaments fully react with river water in the river channel, generated precipitates are removed from the river channel by a sludge lifting pump after being intercepted by a downstream interception dam.

TABLE 1 in situ arsenic and fluorine removing effect of the device

Index of water quality	pH value	Arsenic (As)	Fluoride compounds
				River raw water quality	6～9	0.1-0.9	2-6
Target water quality	6～9	≤0.05	≤1.0

As shown in table 1, the river water treated in example 1 can efficiently purify raw river water from poor V (arsenic and fluoride are poor V) to surface water of iii. In this example 1, the raw water quality of a certain river channel in Chenzhou city of Hunan province was successfully purified from the poor V-type to the III-type surface water quality by means of the high-efficiency arsenic-and fluorine-removing adsorbent. Compare in current remove arsenic defluorinating device to the dystopy processing mode of water, the utility model discloses shorten construction period greatly, also saved construction investment cost simultaneously, be particularly useful for the emergent class project that river course arsenic, fluoride exceed standard suddenly.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The in-situ arsenic and fluorine removal device for the riverway is characterized by comprising a first dosing device and a second dosing device, wherein the first dosing device is used for dosing different medicaments, the first dosing device comprises a first dosing tank (1), a first power piece (2), a first dosing pipeline (3), a first safety return pipeline (4), a first valve, a first filter (5) and a first flow meter (6), the first dosing tank (1) is arranged on a flat ground beside a riverway dam, one end of the first dosing pipeline (3) is connected with the first dosing tank (1), the other end of the first dosing pipeline is communicated with a riverway dosing point, the first filter (5) and the first power piece (2) are both arranged on the first dosing pipeline (3) and are sequentially arranged along the medicament flow direction, the first flow meter (6) is arranged at one end, close to the riverway dosing point, of the first dosing pipeline (3), one end of the first safety return pipeline (4) is communicated with the first dosing pipeline (3), the other end of the first safety return pipeline is communicated with the first dosing tank (1), and the first valves are distributed on the first dosing pipeline (3) and the first safety return pipeline (4);

the second medicine adding device comprises a second medicine adding and allocating facility (7), a second power piece (8), a second medicine adding pipeline (9), a second safe return pipeline (10), a second valve, a second filter (11) and a second flow meter (12), wherein the second medicine adding and allocating facility (7) is arranged on the flat ground beside the river dam, one end of the second medicine adding pipeline (9) is connected with the second medicine adding and allocating facility (7), the other end of the second medicine adding pipeline is communicated with a river medicine adding point, the second filter (11) and the second power piece (8) are both arranged on the second medicine adding pipeline (9) and are sequentially arranged along the medicine flow direction, the second flow meter (12) is arranged at one end, close to the river medicine adding point, of the second medicine adding pipeline (9), one end of the second safe return pipeline (10) is communicated with the second medicine adding pipeline (9), and the other end of the second medicine adding pipeline is communicated with the second allocating facility (7), the second valves are distributed on the second administration line (9) and the second safety return line (10).

2. The in-situ arsenic and fluorine removal device for riverway according to claim 1, wherein the first drug administration device and the second drug administration device are arranged along the length direction of the riverway dam, and the drug administration points of the two devices are located at the same position in the riverway.

3. The in-situ arsenic and fluorine removal device for the riverway according to claim 2, wherein the first chemical dosing pipeline (3) comprises a first main pipeline (3.1), a second main pipeline (3.2) and at least two groups of first branch pipelines (3.3) which are arranged in parallel, the first main pipeline (3.1) is used for communicating a first chemical dosing tank (1) with each first branch pipeline (3.3) which is connected in parallel, the number of the first main pipelines (3.1) is equal to that of the first chemical dosing tanks (1), the second main pipeline (3.2) is used for communicating each first branch pipeline (3.3) which is connected in parallel with a riverway chemical dosing point, the first flowmeter (6) is arranged on the second main pipeline (3.2), and each first branch pipeline (3.3) is provided with a first filter (5) and a first power component (2);

one end of the first safety return pipeline (4) is communicated with each first branch pipeline (3.3) in the first administration pipeline (3);

the second dosing pipeline (9) comprises a third main pipeline (9.1), a fourth main pipeline (9.2) and at least two groups of second branch pipelines (9.3) which are arranged in parallel, the third main pipeline (9.1) is used for communicating a second dosing and allocating facility (7) and each second branch pipeline (9.3) which is connected in parallel, the number of the third main pipeline (9.1) is equal to that of the second dosing and allocating facility (7), the fourth main pipeline (9.2) is used for communicating each second branch pipeline (9.3) which is connected in parallel and a river channel dosing point, the second flowmeter (12) is arranged on the fourth main pipeline (9.2), and each second branch pipeline (9.3) is provided with a second filter (11) and a second power part (8);

one end of the second safety return line (10) communicates with each of the second branch lines (9.3) of the second administration lines (9).

4. The device for in-situ removal of arsenic and fluorine from a river channel according to claim 3, wherein the first valve comprises a plurality of first ball valves (13), a first backpressure valve (14), a first check valve (15) and a first safety valve (16), the first ball valves (13) are respectively arranged on the first main pipeline (3.1), the second main pipeline (3.2) and each first branch pipeline (3.3), each first branch pipeline (3.3) is provided with the first backpressure valve (14) and the first check valve (15), which are sequentially arranged along the flow direction of the chemical, and are both arranged on the downstream section of the first power part (2) on the first branch pipeline (3.3), and the first safety valve (16) is arranged on the first safety return pipeline (4);

the second valve comprises a second ball valve (17), a second backpressure valve (18), a second check valve (19) and a second safety valve (20), the number of the second ball valves (17) is multiple, the second ball valves are respectively arranged on a third main pipeline (9.1), a fourth main pipeline (9.2) and each second branch pipeline (9.3), each second branch pipeline (9.3) is provided with the second backpressure valve (18) and the second check valve (19), the second backpressure valves and the second check valves are sequentially arranged along the flow direction of the medicament and are both located at the downstream section of the second power part (8) on the second branch pipeline (9.3), and the second safety valve (20) is arranged on the second safety return pipeline (10).

5. The in-situ arsenic and fluorine removal device for the riverway according to claim 3, wherein the first chemical dosing device further comprises a plurality of first pulse dampers (21), and the first pulse dampers (21) are correspondingly arranged on the first branch pipelines (3.3) one by one and are respectively located between the first power part (2) and the first back pressure valve (14) on the first branch pipeline (3.3);

the second dosing device further comprises a plurality of second pulse dampers (22), wherein the second pulse dampers (22) are correspondingly arranged on the second branch pipelines (9.3) one by one and are respectively positioned between the second power piece (8) and the second back pressure valve (18) on the second branch pipeline (9.3).

6. The in-situ riverway arsenic and fluorine removal device according to any one of claims 1 to 5, wherein the first chemical dosing device further comprises a liquid chemical tanker (23) and a chemical discharge tank (24) located on the riverway dam, the chemical discharge tank (24) is respectively communicated with the liquid chemical tanker (23) and the first chemical dosing tank (1) through a pipeline, the first chemical dosing tank (1) is lower than the chemical discharge tank (24), and the first chemical dosing tanks (1) are multiple in number and arranged in parallel with each other.

7. The in-situ arsenic and fluorine removing device for the riverway according to any one of claims 1-5, wherein the second chemical feeding device further comprises a third power member (25), a water inlet pipeline (26), a vent pipeline (27) and an overflow pipeline (28), the third power member (25) is disposed on the water inlet pipeline (26), one end of the water inlet pipeline (26) is communicated with the second chemical feeding and blending facility (7), the other end of the water inlet pipeline is communicated with the river water in the riverway, the chemical inflow ends of the vent pipeline (27) and the overflow pipeline (28) are both communicated with the second chemical feeding and blending facility (7), and the chemical outflow end is both communicated with an external collecting device.

8. The device for in-situ removal of arsenic and fluorine in the riverway according to claim 7, wherein a third ball valve (26.1) and a third check valve (26.2) are arranged on the water inlet pipeline (26) and are sequentially arranged along the water inlet direction of the water inlet pipeline (26), and a fourth ball valve (27.1) is arranged on the emptying pipeline (27).

9. The in-situ arsenic and fluorine removal device for the riverway according to claim 8, wherein the second dosing and blending facility (7) is an integrated drug dissolving machine.

10. The device for in-situ removal of arsenic and fluorine in the riverway according to claim 9, wherein the first power member (2), the second power member (8) and the third power member (25) are all water pumps, the first flow meter (6) and the second flow meter (12) are all electromagnetic flow meters, and the first filter (5) and the second filter (11) are all Y-type filters.