An initial rainwater collection and purification pool and purification process

Abstract

The present invention designs an initial rainwater collection and purification pool and a purification process, comprising five systems: pool body ventilation, rainwater inlet, coagulant addition, mud water gas distribution, and collection pool emptying. The space required for rainwater storage is utilized, and on the basis of the storage function, it has both rainwater purification and sludge removal functions, and can realize the separation of impurities in the water, without the need to build an independent water purification structure separately; a reciprocating traction mud suction vehicle group is adopted at the bottom of the pool body to collect sludge and debris, and there is no live equipment in the pool body; the purification process is in an intermittent operation mode, which is automatically controlled by a configured industrial control computer, and sequentially completes the processes of rainwater collection → coagulant addition → coagulation sedimentation → mud discharge → (clean) water discharge → standby, etc. The coagulation process adopts an air bubble stirring mode, which has the advantages of saving land, high utilization efficiency of engineering facilities, reliable water purification effect, simple structure, convenient operation and management, high degree of automation, etc.; and it has the advantages of low investment and low operation and maintenance costs.

Description

Technical Field

[0001] The invention relates to an initial rainwater collection and purification pool and a purification process, which are used for the collection and treatment of initial polluted rainwater and belong to the technical field of water environment management and sponge city construction. Background Art

[0002] In the process of urban modernization, the large amount of buildings occupying limited ground leads to surface runoff pollution during rainfall, especially initial rainwater pollution, which is one of the important causes of urban black and odorous water bodies, and has therefore become the main targeted control target of urban water environment governance and sponge city construction. In order to reduce the pollution of initial rainwater to the environment, the main technical measures adopted in the project are to collect rainwater in the initial stage of rainfall through the regulating reservoir, and then purify it during the rainy season or after the rain. The general priority is to transport the collected rainwater to the urban sewage treatment plant. If the construction conditions do not allow (such as the limited treatment capacity of the sewage treatment plant) or the construction is difficult (such as the long distance to the sewage treatment plant or the difficulty of laying pipelines), an independent initial rain purification plant is selected, and its water purification process is mainly based on physical and chemical treatment. Due to the unevenness of rainfall in time, the water treatment structures in the initial rain purification plant only operate during the rainy season, so there are many shortcomings such as low facility utilization, high equipment idle rate, high investment and operation and maintenance costs, and low investment and construction benefits. Therefore, in order to improve the technical feasibility and economic rationality of initial rainwater treatment construction projects, it is urgent to develop more targeted and applicable initial rainwater treatment facilities to meet the needs of economic and social development and application markets.

[0003] The invention patent "A method for rainwater infiltration, storage and purification" (201611100292.1) filters rainwater through gravel, PP cotton, activated carbon and other materials, and then treats it in a sterilization method. Its shortcomings are: small batch processing volume, short reuse cycle of the treatment device, and high processing cost; the new patent "A rainwater garden system with enhanced water purification function" (201721441941.4) The device disclosed has problems such as small processing volume, large space occupation, and is not suitable for urban rainwater treatment. Summary of the invention

[0004] The purpose of the present invention is to design an initial rainwater collection and purification pool and a purification process in view of the problems described in the background technology. The initial rainwater collection and purification pool includes five systems: pool body ventilation, rainwater inlet, coagulant addition, mud water gas distribution, and collection pool emptying. It utilizes the space required for rainwater storage and regulation, and has both rainwater purification and sludge removal functions on the basis of the storage function, and can realize the separation of impurities in the water without the need to build an independent water purification structure separately. A reciprocating traction mud suction vehicle group is used to collect silt and debris at the bottom of the pool body, and there is no live equipment in the pool body. The purification process is in intermittent operation mode, and is automatically controlled by the configured industrial control computer to sequentially complete the processes of rainwater collection → coagulant addition → coagulation sedimentation → mud discharge → water discharge → standby, etc. The coagulation process adopts air bubble stirring mode, which has the advantages of saving land, high utilization efficiency of engineering facilities, reliable water purification effect, simple structure, convenient operation and management, and high degree of automation. It also has the advantages of low investment and low operation and maintenance costs.

[0005] The technical solution of the present invention is: an initial rainwater collection and purification pool and a purification process, the initial rainwater collection and purification pool comprising: a pool body (1), the pool body (1) is in a concave rectangular parallelepiped shape, and the pool body (1) is provided with the following from top to bottom: in the structural space required for rainwater regulation and storage, by configuring corresponding electromechanical equipment, pipeline valves, water level and water quality sensors and automatic control equipment connected thereto, a pool body ventilation system, a rainwater inlet system, a coagulant dosing system, a mud water gas distribution system, and a collection and storage pool emptying system are formed.

[0006] The tank body ventilation system comprises: ventilation pipes (2); the ventilation pipes (2) are evenly distributed on the top of the tank body (1);

[0007] The rainwater inlet system comprises: a water level sensor (24) and a water inlet valve (25); the water level sensor (24) is used to measure whether the water level in the pool is at a high water level, a low water level or an empty water level; the water inlet valve (25) is used to introduce external rainwater;

[0008] The coagulant dosing system comprises: a dosing valve (3) and a dosing pipe (4); the dosing valve (3) adds coagulant-type precipitation drugs into the tank body (1) through the dosing pipe (4);

[0009] The mud-discharging water gas distribution system comprises: a mud-discharging water gas distribution pipeline (5), a flexible connecting hose (9), a traction-type bidirectional submersible mud suction vehicle (7), a mud suction vehicle track (22), a traction guide wheel (10), a traction rope (13), a connecting rod (11) and a winch (14), a mud-discharging water pump (20), a blower (27), an air supply pipe (15), an air supply valve (26), a mud-discharging water pipe (18), a mud-discharging valve (16), a water discharge valve (17), and an online turbidity meter (23); the online turbidity meter (23) is used to detect the turbidity of the water in the tank body (1);

[0010] The towed bidirectional submersible sludge suction vehicle (7) is fixedly connected with a perforated sludge suction pipe (8), the upper part of the perforated sludge suction pipe (8) is connected with a flexible connecting hose (9), the upper part of the flexible connecting hose (9) is connected with a sludge water gas distribution pipeline (5), the other end of the sludge water gas distribution pipeline (5) is respectively connected with the inlet of a sludge water pump (20) and the air supply pipe (15); the air supply pipe (15) is connected with a blower (27) through an air supply valve (26); the outlet of the sludge water pump (20) is connected in parallel with a sludge discharge valve (16) and a water discharge valve (17);

[0011] During the same period of operation, only one of the mud discharge pump (20) and the blower (27) is in operation, and only one of the mud discharge valve (16) and the drain valve (17) is opened. When the mud discharge pump (20) is in operation, mud or water deposited in the tank body (1) is sucked in through the mud discharge water gas distribution pipeline (5), the flexible connecting hose (9), and the perforated mud suction pipe (8), and discharged outward through the mud discharge water pipe (18). When the blower (27) is in operation, external air is sequentially passed through the air supply valve (26), the air supply pipe (15), the mud discharge water gas distribution pipeline (5), the flexible connecting hose (9), and the perforated mud suction pipe (8) to add compressed air into the tank body (1).

[0012] The traction-type bidirectional submersible sludge suction vehicles (7) are arranged in series in a row along the length direction of the bottom of the tank body (1), and the traction-type bidirectional submersible sludge suction vehicles (7) in series are hinged by connecting rods (11) to form a single-row sludge suction vehicle group; the number of traction-type bidirectional submersible sludge suction vehicles (7) in the single-row sludge suction vehicle group is set according to the length of the tank body (1), and the number of rows of the single-row sludge suction vehicle group is set according to the width of the tank body (1);

[0013] The two ends of the single-row mud suction vehicle group are connected with a traction rope (13), and the traction rope (13) is connected to a winch (14) through a traction guide wheel (10). The winch (14) is used to pull the traction-type bidirectional submersible mud suction vehicle (7) to reciprocate on the mud suction vehicle track (22);

[0014] The collection tank emptying system comprises: a drainage pump (12), a drainage pipe (19) and a one-way drainage valve (21); the inlet of the drainage pump (12) is located below the inlet of the perforated mud suction pipe (8), and the drainage pump (12) is used to empty the water accumulated at the lowest position in the tank body (1);

[0015] The various electromechanical equipment and control valve components assigned to the tank body (1) are automatically controlled by an industrial computer connected thereto.

[0016] The present invention also discloses an initial rainwater collection and purification process. The initial rainwater collection and purification tank is set to an intermittent operation mode during operation and is automatically controlled by a configured industrial control computer to sequentially complete the processes of rainwater collection → adding coagulant → coagulation sedimentation → mud discharge → drainage → standby, which are respectively as follows:

[0017] Rainwater collection and storage: Initially, rainwater enters the pool body (1) through the municipal rainwater collection system via the water inlet valve (25). When the water level in the pool rises to the designed water level, the water inlet valve (25) is closed by the high water level signal of the water level sensor (24), thereby realizing the rainwater regulation and storage function;

[0018] Adding coagulant: After the water inlet valve (25) is closed, the dosing valve (3) is opened, and a certain amount of coagulant is quantitatively added to the water in the pool through the dosing pipe (4). After the coagulant is added, the dosing valve (3) is closed;

[0019] Coagulation and sedimentation: After the dosing is completed, the blower (27), the air supply valve (26) and the winch (14) are turned on, and the mud discharge valve (16) and the drain valve (17) are closed. Air enters the water from the bottom of the pool in the form of bubbles through the air supply pipe (15), the mud discharge water distribution pipeline (5), the flexible connecting hose (9) and the perforated mud suction pipe (8). The mixing of the coagulant and the coagulation reaction are completed by the disturbance of the water body during the rising process of the bubbles. At the same time, the winch (14) drives the traction-type bidirectional submersible mud suction vehicle (7) group along the mud suction vehicle track (22) through the traction rope (13) and the mud suction vehicle connecting rod (11), and performs bidirectional reciprocating motion within a certain stroke, so as to achieve uniform air distribution on the plane and complete the coagulation reaction by using the air stirring effect.

[0020] After the set air stirring time (about 20 to 30 minutes) is reached, the blower (27), the air delivery valve (26) and the winch (14) are turned off. Thereafter, the flocs formed by the coagulation reaction of the suspended matter in the water begin to settle, and the flocs in the water settle to the bottom of the pool to form a mud layer, and the rainwater in the pool (1) is gradually clarified.

[0021] Mud discharge and drainage: After a long period of static sedimentation (about 4 to 6 hours), when most of the suspended matter in the water sinks to the bottom of the pool and the water quality meets the standard, the winch (14), mud discharge pump (20) and mud discharge valve (16) are turned on. The winch (14) drives the traction-type bidirectional submersible mud suction vehicle (7) along the mud suction vehicle track (22) through the traction rope (13) and the mud suction vehicle connecting rod (11), and performs bidirectional reciprocating motion within a certain stroke. The mud collected at the bottom of the pool is sucked in through the perforated mud suction pipe (8), and then discharged to the outside of the pool through the flexible connecting hose (9), mud discharge water distribution pipeline (5), mud discharge pump (20), mud discharge pipe (18) and mud discharge valve (16) for separate treatment and disposal.

[0022] When the online turbidity meter (23) detects that the turbidity of rainwater in the pool (1) is lower than the set value, the winch (14) and the mud discharge valve (16) are closed, and the drainage pump (12) and the drainage valve (17) are opened to discharge the purified rainwater out of the pool. When the water level in the pool drops to the designed low water level, the mud discharge pump (20) is closed using the low water level signal of the water level sensor (24).

[0023] Pool emptying and standby: When the remaining water in the rainwater pool is emptied, the water level sensor (24) uses the emptying water level signal to close the drainage pump (12) and the drainage valve (17). Then, the water inlet valve (25) is opened, and the entire system returns to standby mode until the next rain arrives, and the above process is repeated.

[0024] The time for emptying the pool can be determined based on the rainfall control frequency (the interval between two rains) of the initial rain pollution control system.

[0025] It can be seen from the above technical scheme that the initial rainwater collection and purification pool of the present invention utilizes the structural space of the rainwater storage pool and adopts an intermittent physical and chemical treatment method to sequentially realize the rainwater storage and treatment functions. The treatment effect has strong controllability, simple structure, convenient operation, maintenance and management, low investment and operating costs, and a high degree of automation.

[0026] From the above analysis of the technical solution, it can be seen that compared with the currently commonly used initial rainwater collection and purification facilities, the present invention has the following significant features:

[0027] (1) The functions of rainwater collection and treatment can be completed in the same structure in a short period of time. That is, the impurities in the water can be separated by using the space of the rainwater regulation pool, without the need to transport it to the urban sewage treatment plant for treatment or to build an independent initial rainwater purification plant;

[0028] (2) In order to meet the construction requirements of the structure, the coagulation process adopts air bubble stirring method.

[0029] (3) Since rainwater treatment adopts intermittent operation mode, the coagulation and sedimentation time is highly adjustable, thus achieving better treatment effect than continuous operation mode;

[0030] (4) The initial rainwater purification and pool emptying time is short. The entire process from treatment to emptying can take less than 12 hours, which is suitable for occasions with short intervals between rainfall events.

[0031] (5) A reciprocating traction sludge suction vehicle group is used. Except for the submersible drainage pump, there is no other electromechanical equipment in the water pool. It is suitable for rainwater storage pools with large underground burial depth and humid environment in the pool;

[0032] (6) Simple structure, easy operation, maintenance and management, low investment and operating costs, and high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the internal structure of "an initial rainwater collection and purification pool" according to an embodiment of the present invention.

[0034] Description of the symbols in the accompanying drawings:

[0035] 1—tank body, 2—ventilation pipe, 3—dosing valve, 4—dosing pipe, 5—mud discharge and air distribution pipeline, 7—traction type two-way submersible mud suction vehicle, 8—perforated mud suction pipe, 9—flexible connecting hose, 10—traction guide wheel, 11—connecting rod, 12—drainage pump, 13—traction rope, 14—winch, 15—air transmission pipe, 16—mud discharge valve, 17—drainage valve, 18—mud discharge water pipe, 19—drainage pipe, 20—mud discharge water pump, 21—one-way drainage valve, 22—mud suction vehicle track, 23—online turbidity meter, 24. Water level sensor, 25—water inlet valve, 26—air transmission valve, 27—blower. DETAILED DESCRIPTION

[0036] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings, examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention. Anything not described in detail in this technical solution is a known technology.

[0037] See also Figure 1 The present invention discloses an initial rainwater collection and purification pool, comprising: a pool body 1, the pool body 1 is in a concave rectangular parallelepiped shape, and the pool body 1 is provided with the following from top to bottom: in the structural space required for rainwater storage and regulation, by configuring corresponding electromechanical equipment, pipeline valves, water level and water quality sensors and automatic control equipment connected thereto, a pool body ventilation system, a rainwater inlet system, a coagulant dosing system, a mud water gas distribution system, and a collection and storage pool emptying system are formed.

[0038] The tank body ventilation system comprises: ventilation pipes 2; the ventilation pipes 2 are evenly distributed on the top of the tank body 1.

[0039] The rainwater inlet system includes: a water level sensor 24 and an inlet valve 25; the water level sensor 24 is used to measure whether the water level in the pool is at a high water level, a low water level or an empty water level; the inlet valve 25 is used to introduce external rain. The coagulant dosing system includes: a dosing valve 3 and a dosing pipe 4; the dosing valve 3 adds coagulant-type precipitation drugs into the pool 1 through the dosing pipe 4.

[0040] The mud water gas distribution system includes: a mud water gas distribution pipeline 5, a flexible connecting hose 9, a traction-type two-way submersible mud suction vehicle 7, a mud suction vehicle track 22, a traction guide wheel 10, a traction rope 13, a connecting rod 11 and a winch 14, a mud water pump 20, a blower 27, an air supply pipe 15, an air supply valve 26, a mud water pipe 18, a mud discharge valve 16, a drain valve 17, and an online turbidity meter 23; the online turbidity meter 23 is used to detect the turbidity of the water in the pool body 1.

[0041] A perforated mud suction pipe 8 is fixedly connected to the towed bidirectional submersible mud suction vehicle 7, the upper part of the perforated mud suction pipe 8 is connected to the flexible connecting hose 9, the upper part of the flexible connecting hose 9 is connected to the mud water gas distribution pipeline 5, and the other end of the mud water gas distribution pipeline 5 is respectively connected to the inlet of the mud water pump 20 and the air supply pipe 15; the air supply pipe 15 is connected to the blower 27 through the air supply valve 26; the mud discharge valve 16 and the water drain valve 17 are connected in parallel at the outlet of the mud water pump 20.

[0042] During the same period of operation, only one of the mud discharge pump 20 and the blower 27 is in operation, and only one of the mud discharge valve 16 and the drain valve 17 is opened; when the mud discharge pump 20 is in operation, the mud or water deposited in the pool body 1 is sucked in through the mud discharge water air distribution pipeline 5, the flexible connecting hose 9, and the perforated mud suction pipe 8 in turn, and discharged outward through the mud discharge water pipe 18; when the blower 27 is working, external air is added with compressed air into the pool body 1 through the air supply valve 26, the air supply pipe 15, the mud discharge water air distribution pipeline 5, the flexible connecting hose 9 and the perforated mud suction pipe 8 in turn.

[0043] The towed bidirectional submersible sludge suction vehicles 7 are distributed in series in a row along the length direction of the bottom of the pool body 1, and each series-connected towed bidirectional submersible sludge suction vehicle 7 is hinged by a connecting rod 11 to form a single-row sludge suction vehicle group; the number of towed bidirectional submersible sludge suction vehicles 7 in the single-row sludge suction vehicle group is set according to the length of the pool body 1, and the row of the single-row sludge suction vehicle group is set according to the width of the pool body 1.

[0044] Both ends of the single-row mud suction vehicle group are connected with a traction rope 13 , and the traction rope 13 is connected to a winch 14 through a traction guide wheel 10 . The winch 14 is used to tow the traction-type bidirectional submersible mud suction vehicle 7 back and forth on the mud suction vehicle track 22 .

[0045] The collecting tank emptying system includes: a drainage pump 12, a drainage pipe 19 and a one-way drainage valve 21; the inlet of the drainage pump 12 is located below the inlet of the perforated mud suction pipe 8, and the drainage pump 12 is used to empty the sediment deposited at the lowest position in the tank body 1.

[0046] The various electromechanical equipment and control valves assigned to the tank body 1 are automatically controlled by an industrial computer connected thereto.

[0047] The present invention is based on an initial rainwater collection and purification pool that adopts an intermittent operation mode during operation, which is automatically controlled by a configured industrial control computer to sequentially complete the processes of rainwater collection → adding coagulant → coagulation sedimentation → mud discharge → clear water discharge → standby, which are respectively as follows:

[0048] Rainwater collection: Initially, rainwater enters the pool 1 through the municipal rainwater collection system via the water inlet valve 25. When the water level in the pool rises to the designed water level, the water inlet valve 25 is closed by the high water level signal of the water level sensor 24, thereby realizing the rainwater regulation and storage function.

[0049] Adding coagulant: After the water inlet valve 25 is closed, the dosing valve 3 is opened to quantitatively add a certain amount of coagulant to the water in the pool through the dosing pipe 4. After the coagulant is added, the dosing valve 3 is closed.

[0050] Coagulation and sedimentation: After the dosing is completed, the blower 27, the air supply valve 26 and the winch 14 are turned on, and the mud discharge valve 16 and the drain valve 17 are closed. The air enters the water from the bottom of the pool in the form of bubbles through the air supply pipe 15, the mud water distribution pipeline 5, the flexible connecting hose 9 and the perforated mud suction pipe 8. The mixing of the coagulant and the coagulation reaction are completed by the disturbance of the water body during the rising process of the bubbles. At the same time, the winch 14 drives the 7 groups of traction-type bidirectional submersible mud suction vehicles along the mud suction vehicle track 22 through the traction rope 13 and the mud suction vehicle connecting rod 11, and performs bidirectional reciprocating motion within a certain stroke, so as to achieve uniform air distribution on the plane and complete the coagulation reaction by using the air stirring effect.

[0051] About 20 to 30 minutes after the set air stirring time is reached, the blower 27, the air delivery valve 26 and the winch 14 are turned off. Thereafter, the flocs formed by the coagulation reaction of the suspended matter in the water begin to settle, and the flocs in the water settle to the bottom of the pool to form a mud layer, and the rainwater in the pool body 1 is gradually clarified.

[0052] Discharge of mud and clear water: After a long period of about 4 to 6 hours of static sedimentation, when most of the suspended matter in the water sinks to the bottom of the pool and the water quality meets the standard, the winch 14, the mud discharge pump 20, and the mud discharge valve 16 are turned on. The winch 14 drives the traction-type bidirectional submersible mud suction vehicle 7 along the mud suction vehicle track 22 through the traction rope 13 and the mud suction vehicle connecting rod 11, and performs bidirectional reciprocating motion within a certain stroke. The mud collected at the bottom of the pool is sucked in through the perforated mud suction pipe 8, and then discharged to the outside of the pool through the flexible connecting hose 9, the mud discharge water distribution pipeline 5, the mud discharge pump 20, the mud discharge pipe 18 and the mud discharge valve 16 for separate treatment and disposal.

[0053] When the online turbidity meter 23 detects that the turbidity of rainwater in the pool body 1 is lower than the set value, the winch 14 and the mud discharge valve 16 are closed, and the drainage pump 12 and the drainage valve 17 are opened to discharge the purified rainwater out of the pool. When the water level in the pool drops to the designed low water level, the mud discharge pump 20 is closed using the low water level signal of the water level sensor 24.

[0054] Pool emptying and standby: When the remaining water in the rainwater pool is emptied, the water level sensor 24 is used to drain the water level signal to close the drainage pump 12 and the drainage valve 17. Then, the water inlet valve 25 is opened, and the entire system returns to the standby state until the next rain arrives and the above process is repeated.

[0055] The time for emptying the pool can be determined based on the rainfall control frequency (the interval between two rains) of the initial rain pollution control system.

[0056] It can be seen from the above technical scheme that this initial rainwater collection and purification treatment pool utilizes the structural space of the rainwater storage pool and adopts intermittent physical and chemical treatment methods to sequentially realize the rainwater storage and treatment functions. The treatment effect is highly controllable, the structure is simple, and the operation, maintenance and management are convenient. The investment and operation costs are low, and the degree of automation is high.

[0057] The present invention completes the functions of rainwater collection and treatment in the same structure in a short time. That is, by utilizing the space of the rainwater regulating pool, the impurities in the water can be separated, without the need to transport it to the urban sewage plant for treatment or to build an independent initial rainwater purification plant. In order to meet the process construction requirements of the structure, the coagulation process adopts an air bubble stirring method. Since the rainwater treatment adopts an intermittent operation mode, the coagulation and sedimentation time are highly adjustable, so that a better treatment effect can be obtained than the continuous operation mode. The initial rainwater purification and pool emptying time are short, and the whole process from treatment to emptying can take less than 12 hours, which is suitable for occasions with short intervals between rainfall events. A reciprocating traction sludge suction vehicle group is adopted. Except for the submersible drainage pump, there is no other electromechanical equipment in the pool, which is suitable for the characteristics of the rainwater regulating pool with a large underground burial depth and a humid environment in the pool. The device has a simple structure, is easy to operate, maintain and manage, has low investment and operating costs, and has a high degree of automation.

[0058] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "length", "width", "up", "down", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "fixed", "fixed connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. An initial rainwater collection and purification pool, comprising: The tank body (1) is in the shape of a concave rectangular parallelepiped, and is provided with the following components from top to bottom: a tank body ventilation system, a rainwater inlet system, a coagulant dosing system, a mud water gas distribution system, and a storage tank emptying system; the characteristics are: The tank body ventilation system comprises: ventilation pipes (2); the ventilation pipes (2) are evenly distributed on the top of the tank body (1); The rainwater inlet system comprises: a water level sensor (24) and a water inlet valve (25); the water level sensor (24) is used to measure whether the water level in the pool is at a high water level, a low water level or an empty water level; the water inlet valve (25) is used to introduce external rainwater; The coagulant dosing system comprises: a dosing valve (3) and a dosing pipe (4); the dosing valve (3) adds coagulant-type precipitation drugs into the tank body (1) through the dosing pipe (4); The mud-discharging water gas distribution system comprises: a mud-discharging water gas distribution pipeline (5), a flexible connecting hose (9), a traction-type bidirectional submersible mud suction vehicle (7), a mud suction vehicle track (22), a traction guide wheel (10), a traction rope (13), a connecting rod (11), a winch (14), a mud-discharging water pump (20), a blower (27), an air supply pipe (15), an air supply valve (26), a mud-discharging water pipe (18), a mud-discharging valve (16), a water discharge valve (17), and an online turbidity meter (23); the online turbidity meter (23) is used to detect the turbidity of the water in the tank body (1); The towed bidirectional submersible sludge suction vehicle (7) is fixedly connected with a perforated sludge suction pipe (8), the upper part of the perforated sludge suction pipe (8) is connected with a flexible connecting hose (9), the upper part of the flexible connecting hose (9) is connected with a sludge water gas distribution pipeline (5), the other end of the sludge water gas distribution pipeline (5) is respectively connected with the inlet of a sludge water pump (20) and the air supply pipe (15); the air supply pipe (15) is connected with a blower (27) through an air supply valve (26); the outlet of the sludge water pump (20) is connected in parallel with a sludge discharge valve (16) and a water discharge valve (17); The traction-type bidirectional submersible sludge suction vehicles (7) are arranged in series in a row along the length direction of the bottom of the tank body (1), and the traction-type bidirectional submersible sludge suction vehicles (7) in series are hinged by connecting rods (11) to form a single-row sludge suction vehicle group; the number of traction-type bidirectional submersible sludge suction vehicles (7) in the single-row sludge suction vehicle group is set according to the length of the tank body (1), and the number of rows of the single-row sludge suction vehicle group is set according to the width of the tank body (1); The two ends of the single-row mud suction vehicle group are connected to a traction rope (13), and the traction rope (13) is connected to a winch (14) through a traction guide wheel (10). The winch (14) is used to pull the traction-type bidirectional submersible mud suction vehicle (7) to reciprocate on the mud suction vehicle track (22); The collection tank emptying system comprises: a drainage pump (12), a drainage pipe (19) and a one-way drainage valve (21); the inlet of the drainage pump (12) is located below the inlet of the perforated mud suction pipe (8), and the drainage pump (12) is used to empty the water accumulated at the lowest position in the tank body (1); Various electromechanical equipment and control valves attached to the tank body (1) are automatically controlled by an industrial computer connected thereto.

2. A purification process for an initial rainwater collection and purification pool according to claim 1, characterized in that: The initial rainwater collection and purification tank is set to intermittent operation mode during operation, and is automatically controlled by the configured industrial computer to sequentially complete the rainwater collection → coagulant addition → coagulation sedimentation → sludge discharge → drainage → standby process, which are as follows: Rainwater collection and storage: Initially, rainwater enters the pool body (1) through the water inlet valve (25) via the municipal rainwater collection system; when the water level in the pool rises to the designed water level, the water inlet valve (25) is closed by the high water level signal of the water level sensor (24), thereby realizing the rainwater regulation and storage function; Adding coagulant: After the water inlet valve (25) is closed, the dosing valve (3) is opened, and a certain amount of coagulant is quantitatively added to the water in the pool through the dosing pipe (4); after the coagulant is added, the dosing valve (3) is closed; Coagulation and sedimentation: after the dosing is completed, the blower (27), the air supply valve (26) and the winch (14) are turned on, and the mud discharge valve (16) and the drain valve (17) are closed; air enters the water from the bottom of the pool in the form of bubbles through the air supply pipe (15), the mud discharge water distribution pipe (5), the flexible connecting hose (9) and the perforated mud suction pipe (8), and the mixing of the coagulant and the coagulation reaction are completed by the disturbance of the water body during the rising process of the bubbles; at the same time, the winch (14) drives the traction-type bidirectional submersible mud suction vehicle (7) group along the mud suction vehicle track (22) through the traction rope (13) and the mud suction vehicle connecting rod (11), and performs bidirectional reciprocating motion within a certain stroke, so as to achieve uniform air distribution on the plane, and complete the coagulation reaction by utilizing the stirring effect of air; Setting: The air stirring time is 20 to 30 minutes. After the air stirring time is reached, the blower (27), the air delivery valve (26) and the winch (14) are turned off. After that, the flocs formed by the coagulation reaction of the suspended matter in the water begin to settle. The flocs in the water settle to the bottom of the pool to form a mud layer, and the rainwater in the pool (1) is gradually clarified. Mud discharge and water discharge: After 4 to 6 hours of static sedimentation, most of the suspended matter in the pool body (1) sinks to the bottom of the pool, and then the winch (14), the mud discharge water pump (20) and the mud discharge valve (16) are turned on. The winch (14) drives the traction-type bidirectional submersible mud suction vehicle (7) to reciprocate along the mud suction vehicle track (22) through the traction rope (13) and the mud suction vehicle connecting rod (11). The sludge accumulated at the bottom of the pool body (1) is sucked in through the perforated mud suction pipe (8), and then discharged to the outside of the pool through the flexible connecting hose (9), the mud discharge water distribution pipeline (5), the mud discharge water pump (20), the mud discharge water pipe (18) and the mud discharge valve (16); When the online turbidity meter (23) detects that the turbidity of rainwater in the pool (1) is lower than the set value, the winch (14) and the mud discharge valve (16) are closed, and the drainage pump (12) and the drainage valve (17) are opened to discharge the purified rainwater out of the pool; when the water level in the pool drops to the designed low water level, the mud discharge pump (20) is closed using the low water level signal of the water level sensor (24); Pool emptying and standby: When the remaining water in the rainwater pool is emptied, the water level sensor (24) uses the emptying water level signal to close the drainage pump (12) and the drainage valve (17); then, the water inlet valve (25) is opened, and the entire system returns to the standby state until the next rain arrives, and the above process is repeated.

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