WO2013073449A1

WO2013073449A1 - Water treatment apparatus and method for treating water

Info

Publication number: WO2013073449A1
Application number: PCT/JP2012/079007
Authority: WO
Inventors: 永治藤田
Original assignee: 坂倉　秀夫
Priority date: 2011-11-14
Filing date: 2012-11-08
Publication date: 2013-05-23
Also published as: JP5058371B1; JP2013103177A

Abstract

Provided are a water treatment apparatus capable of destroying microorganisms in water such as ballast water without requiring a large amount of force, and a method for treating water. A water-hammer device (6) that is installed in a pipe (3) for passing water containing microorganisms and applies water-hammer pressure generated by quick closure of a valve to water in the pipe (3) to destroy and eradicate the microorganisms in the water or other water makes it possible to destroy and eradicate the microorganisms in the water such as ballast water without requiring a large amount of force or using any chemicals or the like. It is thereby possible to perform water treatment without any adverse effect on the environment and at a low cost.

Description

Water treatment apparatus and water treatment method

The present invention relates to a water treatment device and a water treatment method for killing microorganisms in water such as ballast water, circulating bath water, pool water, sewage and factory waste water.

When ballast water injected into a ship's ballast tank is discharged out of the ship as it is at the port of call, microorganisms such as plankton and bacteria contained in the ballast water will flow out of the ship, resulting in ecosystems due to water pollution and transferred organisms. It may adversely affect Thus, conventionally, attempts have been made to kill microorganisms in the ballast water, and the following apparatuses and methods have been proposed.

(1) Method of generating impact hydraulic pressure (see, for example,

Patent Documents

1, 2, 3, 4, and 5)
(2) A method of generating impact force or cavitation caused by a high-speed jet (for example, see Patent Documents 6 and 7).
(3) A method using an ultrasonic shock wave (for example, see Patent Document 8).

Patent Publication 2005-161292 Japanese Patent Publication No. 2005-238090 Patent Publication 2005-246178 Patent Publication 2005-246179 Patent Publication 2005-254138 Patent Publication 2005-271648 Patent Publication 2006-272147 Patent Publication 2006-007184

However, in order to realize these apparatuses and methods, the facilities become very large, and practical application is difficult due to cost problems.

Therefore, an object of the present invention is to provide a water treatment apparatus and a water treatment method that do not require large power and can kill microorganisms in water such as ballast water.

The water treatment apparatus of the present invention is provided in the middle of a pipe for passing water containing microorganisms, and applies water hammer pressure generated by the sudden closing of the valve to the water in the pipe to destroy and kill the microorganisms in the water. It has a water hammer device. In addition, the water treatment method of the present invention generates water hammer pressure by suddenly closing a valve provided in the middle of a pipe through which water containing microorganisms flows, and adds the water hammer to the water in the pipe, thereby It is characterized by destroying and killing.

According to these inventions, by applying water hammer pressure to water containing microorganisms, the water microorganisms are destroyed and killed by water hammer action. The water hammer (water tank, water tank, water hammer) action is a phenomenon in which impact water pressure is generated in the conduit due to the inertia of the water flow when the water flow in the conduit is suddenly closed.

In addition, the water treatment apparatus of the present invention desirably has an accumulator between a pump or valve provided in the middle of the pipe and the water hammer apparatus. As a result, the water hammer pressure generated by the water hammer device is absorbed by the accumulator, and the pumps and valves provided in the middle of the piping can be prevented from being affected by the water hammer pressure.

Also, it is desirable that the pipes are arranged in parallel by being inverted 180 ° in the middle. Thereby, the water hammer force which generate | occur | produces in piping before and behind changing the flow direction of water can be offset.

Here, the water hammer device has a valve chamber and a water conduit that introduces water into the valve chamber, and the valve is rotatably supported on the downstream side of the valve chamber, and the water introduced from the water conduit. A drain valve that closes by kinetic energy, applies water hammer pressure to the water in the valve chamber, and repeats reopening when the water hammer pressure propagates from the valve chamber into the water conduit can be used. Thereby, a water hammer apparatus act | operates using the kinetic energy of the water introduce | transduced from a water conduit.

Also, the water hammer device can be configured to have an actuator that forcibly closes the valve. Thereby, it becomes possible to close a valve earlier than operating using the kinetic energy of the above-mentioned water, and it becomes possible to generate a larger water hammer pressure.

Also, the valve can be repeatedly opened and closed by electric control. As a result, the valve can be opened and closed more reliably than the valve that operates using the kinetic energy of water described above, and the water hammer treatment can be continued stably.

(1) By the construction that destroys and kills microorganisms in the water by generating water hammer pressure by sudden closing of a valve provided in the middle of the pipe through which water containing microorganisms flows, and adding it to the water in the pipe Because it can destroy and kill microbes in the water such as ballast water without using large power and without using chemicals, water treatment can be done at low cost without adversely affecting the environment. Can be done.

(2) By having an accumulator between the pump or valve provided in the middle of the pipe and the water hammer device, the pump or valve provided in the middle of the pipe is prevented from being affected by the water hammer pressure. It is possible to prevent malfunction and destruction of the pump and the valve.

(3) The foundation for installing the pipe by offsetting the water hammer force generated in the pipe before and after changing the water flow direction by arranging the pipe in a 180-degree inversion in the middle It is possible to reduce the burden on the foundation and eliminate the need to increase the strength of the foundation.

(4) The water hammer device has a valve chamber and a water conduit that introduces water into the valve chamber, and the valve is rotatably supported on the downstream side of the valve chamber, and water introduced from the water conduit The movement of water introduced from the water conduit is closed by kinetic energy, applying water hammer pressure to the water in the valve chamber, and a drain valve that repeatedly opens when the water hammer pressure propagates from the valve chamber into the water conduit. The water hammer device is activated using energy, and it is possible to perform water hammer processing without power, and the running cost can be kept low.

(5) The configuration in which the water hammer device has an actuator for forcibly closing the valve makes it possible to close the valve earlier than the operation using the kinetic energy of water, thereby generating a larger water hammer pressure. It becomes possible to perform the water hammer treatment efficiently.

(6) Since the valve is repeatedly opened and closed by electrical control, it is possible to open and close the valve more reliably than the valve that operates using the kinetic energy of water, and the water hammer treatment can be continued stably. It becomes possible to do.

It is a block diagram of the ballast water treatment apparatus in the embodiment of the present invention. It is a schematic block diagram of the water hammer apparatus of FIG. It is an expanded sectional view of the valve chamber of FIG. It is a figure which shows the relationship between critical velocity and water hammer pressure. It is a figure which shows the relationship between another critical velocity and water hammer pressure. It is sectional drawing which shows the structure of a drain valve forced operation apparatus. It is sectional drawing which shows the structure of an accumulator. It is a figure which shows the example of piping. It is a figure which shows another piping example.

1 is a block diagram of a ballast water treatment apparatus according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the water hammer apparatus of FIG. 1, and FIG. 3 is an enlarged sectional view of the valve chamber of FIG.

In FIG. 1, a ballast water treatment apparatus 1 according to an embodiment of the present invention is provided in the middle of a first pipe 3 that passes seawater as ballast water to a ballast tank 2, and includes a pump 4 and an accumulator 5. The water hammer 6 and the first to

third valves

7a, 7b, 7c and the like are configured. The pump 4 is for sending seawater to the ballast tank 2 through the water hammer device 6. The first valve 7 a is provided between the pump 4 and the water hammer device 6 in the middle of the first pipe 3. The second valve 7 b is provided in the middle of the second pipe 8 a that releases the static pressure of the first pipe 3. The third valve 7 c is provided in the middle of the third pipe 8 b that bypasses the discharge water of the pump 4.

The accumulator 5 is provided between the pump 4 and valves 7 a to 7 c in the middle of the pipe 3 and the water hammer device 6. The accumulator 5 is for absorbing the water hammer pressure generated by the water hammer device 6 so that the pump 4 and the valves 7a to 7c are not affected by the water hammer pressure. In order to prevent the pump 4 from being affected by the water hammer pressure more reliably, it is desirable to use a “non-constant volume pump”.

The water hammer device 6 has a water guide pipe 60, a valve chamber 61, a drain pipe 62, a drain valve 63, a drain valve adjusting screw 64, and a stopper 65 as shown in FIG. The drain valve 63 is rotatably supported on the downstream side in the valve chamber 61 by a rotating shaft 63a provided below.

In the water hammer device 6, the drain valve 63 is open in the initial state, and when the seawater enters from the water conduit 60 through the pipe 3 by the pump 4, the drain valve 63 is closed by the kinetic energy. As shown in FIG. 3, the drain valve 63 is provided with a plurality of adjusting plates 63b so that the weight thereof is adjusted so that the drain valve 63 can be easily opened by its own weight when the drain valve 63 is closed. Further, the drain valve adjusting screw 64 is for adjusting the inclination angle θ when the drain valve 63 is opened, and a cushion cushion 64a is provided at a tip portion where the drain valve 63 abuts.

When the drain valve 63 is closed, a water hammer action occurs due to the momentum of the flowing water in the conduit 60, water hammer pressure is applied to the seawater in the valve chamber 61, and microorganisms in the seawater are destroyed and killed. Then, when the water hammer pressure passes from the valve chamber 61 through the water conduit 60 to the pipe 3, the drain valve 63 opens again, and the above process is repeated. The treated seawater is supplied from the drain pipe 62 to the ballast tank 2.

Normally, when the water hammer device 6 operates, the drain valve 63 may remain closed depending on the timing of the reaction (reaction) of the water hammer pressure. In that case, since the static pressure is applied to the drain valve 63 and the drain valve 63 does not move, the valve 7a shown in FIG. 1 is closed and the valve 7b is opened to release the static pressure. At that time, the pump 4 may be turned on (driven) -off (stopped) as the

valves

7a, 7b are opened / closed. However, if the on / off is repeated frequently, the motor of the pump 4 may generate heat. In this embodiment, the pump 4 is not stopped, and the valve 7c is opened to bypass the seawater to the suction side of the pump 4. At this time, by controlling the pump 4 with an inverter, it is possible to reduce the number of rotations and perform energy saving operation.

Here, the operation of the water hammer device 6 will be described in detail. When the speed of water reaches Va (critical speed) with the drain valve 63 open, the drain valve 63 starts to move in the closing direction. Then, the drain valve 63 is accelerated and closed by receiving the dynamic pressure of the water flow. And the moment the valve closes, the water flow stops completely. At this time, a large water hammer pressure (Pa) is generated.

The following is a theoretical explanation.
The force F when a mass m is moving at an acceleration a is
F = m × a (Newton's equation of motion)
It is represented by
Here, the acceleration when a minute speed change (Δv) is made during a minute time (Δt) is
a = Δv ÷ Δt
Is represented by
F = m × a = m × Δv ÷ Δt
It becomes.

When the above equation is modified, F × Δt = m × Δv
It becomes.
That is, assuming that the mass of water in the pipe 3 between the accumulator 5 and the water hammer device 6 is m, the momentum change (m × Δv) when the water speed becomes zero in a short time (Δt) Is equal to the impulse (F × Δt) applied to.

The mass m is the seawater density γ, the length L of the pipe 3 between the accumulator 5 and the water hammer device 6, and the pipe cross-sectional area A.
m = γ × L × A
It is expressed as
The force (F) acting on the drain valve 63 is
F = γ × L × A × Δv ÷ Δt
And
From the speed change Δv (≒ Va)
F≈γ × L × A × Va / Δt
It becomes.

Thus, it can be seen that the force (F) acting on the drain valve 63 increases as Δv (≈Va) increases and Δt decreases. The force (F) applied to the water becomes a pressure wave in the form of water hammer pressure (Pa), and travels through the water at the speed of sound. At this time, microorganisms in the seawater contained in the pipe 3 between the accumulator 5 and the water hammer device 6 are destroyed and killed.

In addition, it turns out that water hammer pressure Pa is linearly proportional to the length of the piping 3 between the accumulator 5 and the water hammer apparatus 6 like following Formula.
Pa = F ÷ A = (γ × L × A × Va / Δt) / A = γ × L × Va / Δt

Also, immediately after the water hammer pressure is generated, the water in the vicinity of the drain valve 63 is instantaneously in a negative pressure state due to the reaction (reaction) of the force (F) applied to the water. At this time, the drain valve 63 is opened by its own weight. Then, water flows again, and when the speed gradually increases and the speed of the water reaches the critical speed (Va), the drain valve 63 is closed again and water hammer pressure (Pa) is generated. The water hammer device 6 repeats such a state indefinitely (see FIG. 4).

Here, the relationship between the pump pressure (ΔP) and the flow velocity (V) is expressed by the following equation (when the pipe is a straight pipe).
ΔP = λ × γ × V ² × L ÷ (2 × g × D)
Where λ: friction resistance of the pipe, γ: density of water, g: acceleration of gravity, L: pipe length, D: pipe diameter.

In actual piping, resistances such as elbows and valves are added, but if the pump pressure and piping conditions are determined, the flow rate of water is uniquely determined. The flow velocity at this time is the maximum flow velocity (Vmax) under this piping condition. If the water hammer cycle ta is increased so that the critical velocity (Va) at which the water hammer pressure is generated is as close as possible to the maximum flow velocity (Vmax), the water hammer pressure (Pa) is increased and the water treatment capacity is also increased. .

The Va and Δt can be changed by adjusting the weight (W) of the drain valve 63, the valve chamber installation angle (α), and the drain valve mounting angle (θ). If θ is increased by the drain valve adjusting screw 64, Va is increased, that is, the water hammer pressure Pa is increased. However, if it is excessively increased, the drain valve 63 does not move (is not closed). Further, if α is increased, the return (opening) of the drain valve 63 is accelerated (maximum 90 °). The weight of the drain valve 63 can be adjusted by increasing or decreasing the number of adjusting plates 63b.

The water hammer pressure Pa for destroying and killing the microorganisms in the water is preferably 5 MPa or more from the experiment, the drain valve operating time Δt = 0.025 seconds or less, and the pressure increase rate Pa / Δt = 200 MPa / second or more. .

According to the ballast water treatment device 1 configured as described above, by applying water hammer pressure to the seawater supplied by the pump 4 to the ballast tank 2 through the pipe 3, the water hammer device 6 destroys microorganisms in the water by the water hammer action. To die. Therefore, since the seawater in which microorganisms have been killed is injected into the ballast tank 2, even if the seawater injected into the ballast tank 2 is discharged out of the ship at the port of call, there is no adverse effect on the environment. That is, in the ballast water treatment apparatus 1 according to the present embodiment, it is possible to destroy and kill microbes in the water by water hammer pressure by opening and closing a very simple drain valve 63, and water treatment can be performed at low cost. It is.

Moreover, in this ballast water treatment apparatus 1, since the water hammer apparatus 6 operates using the kinetic energy of the water introduced from the water conduit 60 and can perform the water hammer process without power, the running cost is reduced. Can be kept low.

Next, the operation of the

valves

7a, 7b, 7c when the water hammer process cannot be continued with the drain valve 63 closed will be described.

The time when the valve 7a is closed, the valve 7b is opened, and the valve 7c is opened is t1, the operation timing of the drain valve 63 (the time from when water starts to flow into the water hammer device 6 until the drain valve 63 operates) is t2. Then, a water hammer cycle ta (= Δt + t1 + t2) as shown in FIG. 5 is obtained. However, although the water hammer time Δt and the timing t2 at which the drain valve 63 operates are roughly determined by the drain valve adjusting screw 64, there are aspects that are left to the future. Therefore, in order to positively control the water hammer time Δt and t2, and consequently the water hammer cycle ta, it is preferable to provide an actuator for forcibly closing the drain valve 63.

FIG. 6 is a cross-sectional view showing a configuration of a drain valve forced operation device as an actuator for forcibly closing the drain valve 63. A drain valve forced operation device 10 shown in FIG. 6 includes an air cylinder 11, a piston 12 that slides in the air cylinder 11, a push rod 13 that is fixed to the piston 12 and operates together with the piston 12, and the push rod 13. And a spring 14 for returning to the position. In this case, the inclination angle θ of the drain valve 63 is approximately 0 °.

In this drain valve forced operation device 10, air is supplied to the chamber 11a of the air cylinder 11 so that the push rod 13 is extended at the timing when the drain valve 63 is actuated. Thereby, the push rod 13 is pushed out and the drain valve 63 is forcibly closed. Thereafter, when the air supply is stopped, the push rod 13 returns to the original position by the restoring force of the spring 14 and the drain valve 63 opens.

In this way, by setting the inclination angle θ of the drain valve 63 to approximately 0 ° and forcibly operating the drain valve forced operation device 10 for t2 hours, the drain valve 63 is raised and lowered until it gets on the water flow, thereby almost water hammering. The cycle ta can be controlled. Thereby, the flow velocity Va at the time of water hammer can be brought close to the maximum flow velocity (Vmax) under the piping conditions at the time of installation, and the underwater microorganisms can be reliably destroyed and killed with a larger water hammer pressure.

In this example, the drain valve 63 is forcibly closed by the drain valve forced operation device 10 using the air cylinder 11, but the present invention is not limited to this, and the drain valve is operated by the repulsive force of the electromagnetic coil. It is also possible to use an actuator such as

Next, an example of the accumulator 5 will be described. FIG. 7 is a cross-sectional view showing the configuration of the accumulator 5.

The accumulator 5 shown in FIG. 7 is one in which a pipe 3 is branched and an air cylinder 50 is connected. The air cylinder 50 is provided with a piston 51 that slides in the air cylinder 50 and a rod 52 that is fixed to the piston 51 and operates together with the piston 51. Further, a pressure tank 53 filled with air having a pressure (0.4 MPa) slightly higher than the maximum pressure (0.3 MPa) of the water flow in the pipe 3 is connected to the chamber 50a on the rod 52 side. Air is supplied to the pressure tank 53 from an air compressor 55 via a pressure reducing valve 54.

When the water hammer pressure is generated in the pipe 3 by the operation of the drain valve 63, the piston 51 is rapidly operated, and the air in the chamber 50a on the rod 52 side is compressed. Thereby, the water hammer pressure in the pipe 3 is relieved and the pump 4 and the valves 7a to 7c are prevented from being affected by the water hammer pressure. When the water hammer pressure is relaxed, the compressed air returns the piston 51 to the position of the stopper 56 (original position). That is, in the ballast water treatment apparatus 1 according to the present embodiment, the accumulator 5 prevents malfunction and destruction of the pump 4 and the valves 7a to 7c.

In this embodiment, the piston type accumulator 5 is shown, but the present invention is not limited to this, and a diaphragm type accumulator may be used. Further, nitrogen may be used instead of air. In this case, a nitrogen cylinder is used instead of the air compressor 55.

Next, an example in which the pipe 3 is arranged so as to change the flow direction of water by 180 ° in the middle will be described with reference to FIGS. 8 and 9.

Although the water hammer generated by the water hammer device 6 is instantaneous, a large water hammer force is generated in the direction of water flow, so that it is necessary to sufficiently ensure the strength of the foundation on which the ballast water treatment device 1 is installed. Therefore, it is preferable that the pipes 3 are reversed 180 degrees in the middle and arranged in parallel with substantially the same length so as to cancel each water hammer force F.

FIG. 8 shows an example in which the pipe 3 is inverted 180 ° in the middle and arranged in parallel vertically as an upper pipe 3a and a lower pipe 3b. The water hammer force F generated by the water hammer device 6 acts in the right direction of the figure in the upper pipe 3a and acts in the left direction of the figure in the lower pipe 3b, but water hammer is caused by these upper pipe 3a and lower pipe 3b. The force F is offset. Thereby, the burden to the foundation which installs the piping 3 can be suppressed, and it becomes unnecessary to increase the intensity | strength of a foundation. However, since a bending moment M (= F × L) is generated by the distance L between the upper pipe 3a and the lower pipe 3b, the upper pipe 3a and the lower pipe 3b are connected to the coupling member 9a so as to withstand the bending moment M. And are supported on the foundation by the support member 9b.

FIG. 9 shows an example in which the pipe 3 is inverted 180 ° three times in the middle and arranged in parallel vertically and horizontally as pipes 3c-1, 3c-2, 3c-3, 3c-4. In the illustrated example, the pipes 3 arranged in parallel are coupled to each other in the upper and lower sides and the left and right by the coupling member 9a and supported by the support member 9b in the same manner as in the example of FIG. In this example, the pump 4 having a large pressure is required, but since the water hammer F and the bending moment M are all canceled out, it is not necessary to increase the strength of the foundation. In addition, vibration can be prevented from propagating by sandwiching the cushion rubber 9c between the foundation and the support member 9b.

In the above embodiment, the water hammer device 6 has the rotary drain valve 63 that rotates about the rotary shaft 63a. However, instead of the rotary drain valve 63, the water hammer device 6 is opened and closed by electrical control. It is possible to use a repetitive opening / closing valve, for example, a guillotine type valve, a rotary butterfly valve or a ball valve. As a drive system, electric, hydraulic drive, pneumatic drive, or the like can be employed. Further, the water hammer valve is preferably closed at a high speed as much as possible. For example, a spring return type valve that is shut off when the electrical signal is closed is preferable. According to the spring return type valve that operates faster than electric operation, it is possible to increase the water hammer pressure.

In the rotary drain valve 63, factors such as θ and α, the weight of the drain valve 63, the amount of water and the pressure of the water are complicatedly involved, so it becomes difficult to control the opening and closing time of the drain valve 63. By using the on-off valve that repeats the above, it is possible to arbitrarily set the open / close time, and it is possible to control the time of the water hammer cycle ta shown in FIGS. 4 and 5.

Further, since the on / off valve is forcibly opened / closed by electric control, the water hammer treatment can be stably continued without being closed and not being opened like the drain valve 63.

The water treatment apparatus and water treatment method of the present invention include a water treatment apparatus and water for killing not only seawater supplied into the ballast tank, but also various underwater microorganisms such as circulating bath water, pool water, sewage and industrial wastewater. It is useful as a processing method.

DESCRIPTION OF SYMBOLS 1 Ballast water treatment apparatus 2 Ballast tank 3 Piping 4 Pump 5 Accumulator 6 Water hammer 60 Water guide pipe 61 Valve chamber 62 Drain pipe 63 Drain valve

63a Rotating shaft

63b Adjustment plate 64 Drain valve adjustment screw 64a Cushion 65

Stopper

7a, 7b,

7c Valve

8a, 8b Piping

9a Coupling member

9b Support member 9c Cushion rubber 10 Drain valve forced operation device 11 Air cylinder 12 Piston 13 Push rod 14 Spring 50 Air cylinder 51 Piston 52 Rod 53 Pressure tank 54 Pressure reducing valve 55 Air compressor 56 Stopper

Claims

Water treatment having a water hammer device that is provided in the middle of a pipe through which water containing microorganisms flows and applies water hammer pressure generated by the sudden closing of the valve to the water in the pipe to destroy and kill microorganisms in the water apparatus.
The water treatment apparatus according to claim 1, wherein the water hammer pressure is 5 MPa or more and the pressure increase rate is 200 MPa / second or more.
The water treatment device according to claim 1, further comprising an accumulator between a pump or valve provided in the middle of the pipe and the water hammer device.
The water treatment device according to claim 2, further comprising an accumulator between a pump or valve provided in the middle of the pipe and the water hammer device.
The water treatment apparatus according to any one of claims 1 to 4, wherein the pipe is a pipe for injecting water into a ballast tank.
The water treatment apparatus according to any one of claims 1 to 4, wherein the pipes are arranged in parallel by being inverted 180 ° in the middle.
The water hammer device includes a valve chamber and a water conduit that introduces the water into the valve chamber, and the valve is rotatably supported on the downstream side of the valve chamber and is introduced from the water conduit. The drain valve is closed by the kinetic energy of the water, applies water hammer pressure to the water in the valve chamber, and repeatedly opens again when the water hammer pressure propagates from the valve chamber into the water conduit. The water treatment apparatus according to any one of 4.
The water treatment apparatus according to any one of claims 1 to 4, wherein the water hammer apparatus includes an actuator that forcibly closes the valve.
The water treatment apparatus according to any one of claims 1 to 4, wherein the valve repeats opening and closing by electric control.
A water hammer device having a drain valve provided in the middle of a first pipe for passing water containing microorganisms, and a water hammer pressure of 5 MPa or more generated by a sudden closure of the drain valve in the first pipe A water hammer device that adds to the water at a pressure increase rate of 200 MPa / second or more to destroy and kill microorganisms in the water and repeatedly opens the drain valve when the water hammer pressure propagates into the first pipe;
A pump which is provided in the middle of the first pipe and feeds water from the previous period to the water hammer device;
A first valve that is provided between the pump and the water hammer in the middle of the first pipe and is closed when the drain valve remains closed;
A water treatment apparatus comprising: a second valve provided in the middle of the second pipe for releasing the static pressure of the first pipe and opened when the drain valve remains closed.
11. The third valve according to claim 10, wherein the third valve is provided in the middle of a third pipe that bypasses the discharge water of the pump to the suction side of the pump, and is opened when the drain valve remains closed. Water treatment equipment.
A water treatment method in which water hammer pressure is generated by suddenly closing a valve provided in the pipe through which water containing microorganisms flows, and is added to the water in the pipe to destroy and kill microorganisms in the water.
A water hammer pressure of 5 MPa or more is generated by a sudden closure of a drain valve provided in the middle of the first pipe through which water containing microorganisms is passed by a pump, and the pressure in the first pipe is increased by 200 MPa / second or more. By adding at a speed, the microorganisms in the water are destroyed and killed, and when the water hammer pressure propagates into the first pipe, the drain valve is repeatedly opened, and the drain valve remains closed. Sometimes, the first valve provided between the pump and the water hammer device in the middle of the first pipe is closed, and the second pipe for releasing the static pressure of the first pipe is used. The water treatment method which opens the 2nd valve | bulb provided in the middle.