JP4591162B2 - Foreign matter separator - Google Patents

Description

  The present invention makes it possible to separate various foreign substances having floatability and sedimentation contained in various effluents (including sludge) discharged from factories and wastewater treatment facilities without using a filter. The present invention relates to a foreign matter separating apparatus.

  Conventionally, there is a swirl tank or the like as a technique for separating foreign substances from drainage without using a filter.

  The swirl tank is a technique for separating a sedimentary substance in the drainage liquid by inertial force using a swirling flow, and a method for improving the separation speed and separation efficiency of foreign substances is disclosed (for example, see Patent Document 1). .

Moreover, in order to cope with various foreign substances contained in the drainage liquid and sludge, a foreign substance separation apparatus combining a turbulent sedimentation tank and a swirl flow separation tank has been proposed (for example, see Patent Document 2).
JP 2002-58914 A JP 2004-321896 A

  However, the conventional swirl tank and the like have a problem that the size of the apparatus is increased in order to take the total amount of drainage to be processed into the swirl tank. In addition, in the foreign matter separation device that combines the conventional turbulent sedimentation tank and the swirl flow separation tank, when the foreign matter trapped in the turbulent sedimentation tank is difficult to return to the drainage storage tank, There has been a problem that foreign matter accumulates in the turbulent sedimentation tank, resulting in blockage of the piping and deterioration of the foreign matter removal performance.

  Therefore, the present invention solves the above-described conventional problems, is small, can cope with various foreign matters, can prevent clogging of piping even if it is operated continuously for a long time, and maintains foreign matter removal performance. It is an object of the present invention to provide a foreign matter separating device that can be used.

Foreign matter separating apparatus of the present invention according to claim 1, the first and second separation tank for separating the drainage reservoir to accumulate the waste liquid containing the sludge, the pivoted from acquisition the drainage inside foreign matter And a drainage intake pipe for taking the drainage from the drainage storage tank into the first separation tank, the first separation tank and the second separation tank, and from the first separation tank An inter-tank connection pipe for allowing the primary treatment liquid to flow into the second separation tank, a drainage return pipe for returning the foreign matter separated in the first separation tank to the drainage storage tank, and the second A secondary treatment liquid lead-out pipe for taking out the secondary treatment liquid from the separation tank; and a drainage return connection pipe provided at a lower part of the second separation tank and connected to the drainage return pipe. The first separation tank The swirling angular velocity of the second separation tank is set to be higher than the swirling angular speed of the second separation tank, and the drainage return connection pipe is placed in the second separation tank. Inflow of the primary treatment liquid flowing into the second separation tank is provided by adjusting a residence time adjustment valve for adjusting the residence time of the primary treatment liquid. The speed is increased or decreased to adjust the turning angular velocity of the primary treatment liquid in the second separation tank.

The foreign matter separating apparatus according to a second aspect of the present invention is the foreign matter separating apparatus according to the first aspect , wherein the secondary processing liquid lead-out pipe has an opening surface into which the secondary processing liquid flows in the second separation tank. It is below the water surface and upward. Foreign matter separating apparatus of the present invention according to claim 3, in the foreign matter separation device according to claim 2, it is provided with a vent valve on top of the second separation tank.

A foreign matter separating apparatus according to a fourth aspect of the present invention is the foreign matter separating apparatus according to the second or third aspect , wherein an upper portion of the second separating tank is connected to the drainage return pipe, and the second separating tank is connected. A floating substance return pipe for returning floating foreign substances accumulated in the upper part to the drainage storage tank is provided.

The present invention increases or decreases the inflow rate of the primary treatment liquid flowing into the second separation tank by adjusting the opening of the residence time control valve, and the swirling angular velocity of the primary treatment liquid in the second separation tank. Can be adjusted. For this reason, more effective foreign matter separation can be performed by finely adjusting the turning angular velocity according to the type of foreign matter. By turning at different angular velocities in the first and second separation tanks, it is possible to separate foreign substances such as paste-like fibers made of cellulose such as toilet paper and to smoothly remove the foreign substances into the drainage storage tank. Even if it returns and performs continuous operation for a long time, the blockage of the pipe can be prevented, and the foreign matter removing performance can be maintained.

First embodiment of the present invention includes a drainage reservoir to accumulate the waste liquid containing the sludge, first separating the pivots from acquisition the drainage within the foreign matter and the second separation tank, A drainage intake pipe for taking the drainage from the drainage storage tank into the first separation tank, the first separation tank and the second separation tank are connected, and 1 from the first separation tank is connected. Inter-tank connection pipe for allowing the next treatment liquid to flow into the second separation tank, a drainage return pipe for returning the foreign matter separated in the first separation tank to the drainage storage tank, and the second separation A secondary treatment liquid lead-out pipe for taking out the secondary treatment liquid from the tank; and a drainage return connection pipe provided at a lower part of the second separation tank and connected to the drainage return pipe. An angular velocity is set to be faster than a turning angular velocity of the second separation tank, and the drainage return connecting pipe is connected to the primary in the second separation tank. A residence time adjustment valve for adjusting the residence time of the chemical liquid is provided, and the flow rate of the primary treatment liquid flowing into the second separation tank is increased or decreased by adjusting the opening of the residence time adjustment valve. The swirling angular velocity of the primary treatment liquid in the second separation tank is adjusted.

According to the present embodiment, by adjusting the opening of the residence time control valve, the inflow rate of the primary treatment liquid flowing into the second separation tank is increased or decreased, and the primary treatment in the second separation tank is performed. The swirl angular velocity of the liquid can be adjusted. For this reason, more effective foreign matter separation can be performed by finely adjusting the turning angular velocity according to the type of foreign matter. A swirling liquid flow is formed in the first separation tank by using the flow rate of the drainage liquid taken from the drainage storage tank to the first separation tank through the drainage intake pipe, and the centrifugal force generated by the high-speed swirling is relatively A large, heavy mass of foreign matter is moved to the inner periphery of the first separation tank and returned to the drainage storage tank through the drainage return pipe along with the drainage, while the primary treatment liquid that separates the foreign matter is connected between the tanks. The foreign matter separated by the swirling liquid flow in the first separation tank is attracted to the returning drainage side by the flow rate difference between the primary treatment liquid and the returning drainage liquid, and together with the drainage liquid It can be returned to the drainage reservoir. Furthermore, the swirl liquid flow is formed in the second separation tank using the flow velocity of the primary treatment liquid taken into the second separation tank through the inter-tank connection pipe, and the flow in the second separation tank is rectified. The foreign matter having a mass heavier than that of the primary treatment liquid can be agglomerated while being gently moved to the inner peripheral portion of the second separation tank by centrifugal force generated by low-speed swirling, and can be settled and separated by gravity.

According to a second embodiment of the present invention, in the foreign matter separation apparatus according to the first embodiment, the secondary treatment liquid outlet pipe has an opening surface through which the secondary treatment liquid flows into the water surface in the second separation tank. On the lower side, it is upward.

According to the present embodiment, both the floating foreign matter floating near the water surface of the second separation tank and the sedimentary foreign matter settled near the bottom of the second separation tank are avoided, and no foreign matter is contained. The next treatment liquid can be taken out. Third embodiment of the present invention, the foreign matter separating apparatus in the second embodiment, is provided with a vent valve on top of the second separation tank. According to this embodiment, the air accumulated in the upper part of the second separation tank can be discharged by the air vent valve. Therefore, the primary treatment liquid can be filled without applying pressure to the second separation tank, and the second separation tank can be made compact and low in cost.

According to a fourth embodiment of the present invention, in the foreign matter separation apparatus according to the second or third embodiment, the upper part of the second separation tank is connected to the upper part of the second separation tank, and the upper part of the second separation tank. Floating matter return pipes are provided for returning floating foreign matter accumulated in the waste water storage tank.
According to the present embodiment, it is possible to obtain a better secondary treatment liquid by removing the floating foreign substances accumulated in the upper part of the second separation tank and returning them to the drainage storage tank.

  Hereinafter, a foreign matter separating apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram illustrating a foreign matter separating apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, waste liquid and sludge discharged from a factory, a sewage treatment plant, and the like are stored in a waste liquid storage tank 1. When some sort of treatment is performed on the drainage or sludge for reuse or volume reduction, it is important to remove foreign substances contained in the drainage in order to prevent blockage of piping of the processing apparatus.

  The foreign matter separation apparatus according to the present embodiment is configured to pressurize and pump waste liquid containing foreign matter from the drainage storage tank 1 and drainage liquid that takes the drainage liquid from the drainage introduction pump 11 into the first separation tank 2. An inter-tank connection pipe B that connects the intake pipe A, the first separation tank 2 and the second separation tank 3 and allows the primary treatment liquid from the first separation tank 2 to flow into the second separation tank 3; , A drainage return pipe C for returning the foreign matter separated in the first separation tank 2 to the drainage storage tank 1, a secondary treatment liquid lead-out pipe D for taking out the secondary treatment liquid from the second separation tank 3, A drainage return connecting pipe E connected to a drainage return pipe C provided at the lower part of the second separation tank.

  The first separation tank 2 is composed of a casing having a cylindrical shape at the top and a conical shape at the bottom, and branches the drained liquid taken in from the drainage intake pipe A into a small amount of primary processing liquid and the remaining waste liquid. At the same time, relatively large and heavy foreign substances contained in the drainage are recirculated to the drainage storage tank 1 through the drainage return pipe C together with the drainage. Here, the separation speed of the foreign matters in the centrifugal force field can be obtained by the formula (1) from Stokes' law.

In equation (1), vω is the separation speed of foreign matter, ρ _p is the density of foreign matter particles, ρ _f is the density of liquid, D _p is the diameter (representative length) of the foreign matter particles, r is the turning radius of the foreign matter particles, ω is the angular velocity of the foreign particles, and μ is the viscosity of the liquid.

  That is, in order to efficiently separate foreign substances from the drainage, the rotational angular velocity (ω) of the foreign particles must be increased. Therefore, the first separation tank 2 takes in the drainage liquid in the tangential direction in the first separation tank 2 through the drainage uptake pipe A, and uses the flow rate of the taken-in drainage to strengthen the first separation tank 2. With a strong centrifugal force generated by a high-speed swirling angular velocity, a relatively large diameter (representative length), and moving a heavy mass of foreign matter to the inner periphery of the high-speed swirling separation tank 2 together with drainage The liquid is returned to the drainage storage tank 1 through the drainage return pipe C. On the other hand, a small amount of the primary treatment liquid that has separated a relatively large and heavy mass of foreign matter is allowed to flow out from the inter-tank connection pipe B, and the foreign matter separated by the swirling liquid flow in the first separation tank 2 It is attracted to the drainage side that returns to the tank 1 and is returned to the drainage storage tank 1 together with the drainage. Here, it is preferable that the flow rate ratio of the primary processing liquid and the drained liquid returned to the drained liquid storage tank 1 is 3: 7 to 1: 9.

  The second separation tank 3 includes a cylindrical body portion 31 and a bowl-shaped bottom portion 32. The trunk portion 31 of the second separation tank 3 includes an inter-tank connection pipe B for introducing the primary treatment liquid into the second separation tank 3 and a secondary treatment liquid lead-out pipe D for deriving the secondary treatment liquid. It protrudes into the second separation tank 3. The inter-tank connection pipe B for introducing the secondary processing liquid is disposed below the secondary processing liquid outlet pipe D and above the bottom portion 32. An elbow is formed at the outlet 33 of the connecting pipe B between the tanks (see FIG. 2 for details), and the primary treatment liquid is caused to flow out in the second separation tank 3 in the tangential direction of the barrel portion 31. A gentle swirling liquid flow is formed in the second separation tank 3 by using the flow velocity of the next treatment liquid, the flow in the second separation tank 3 is rectified, and the weak centrifugal force generated by the low-speed swirling liquid flow is used. Foreign matter having a mass heavier than that of the primary treatment liquid is agglomerated while gently moving to the inner peripheral portion of the second separation tank, and is settled and separated by gravity. Here, the separation speed of the foreign matter in the gravitational field can be obtained by the formula (2) from Stokes' law.

In the equation (2), v _f is the separation speed of foreign matters, ρ _p is the density of foreign particles, ρ _f is the density of liquid, D _p is the diameter (representative length) of foreign particles, g is gravitational acceleration, and μ is The viscosity of the liquid.

That is, in order to efficiently separate foreign substances from the drainage liquid using gravity, the diameter (representative length) (D _p ) of the foreign particles must be increased. Therefore, in the second separation tank 3, the residence time adjustment valve 13 is provided in the drainage return connection pipe E, and the primary flow that flows into the second separation tank 3 by adjusting the opening degree of the residence time adjustment valve 13. Fine adjustment of the swirling flow velocity according to the type of foreign matter contained in the primary treatment liquid is possible by increasing or decreasing the inflow speed of the treatment liquid and adjusting the residence time of the primary treatment liquid in the second separation tank 3 Thus, the foreign particles are efficiently agglomerated to increase the diameter (D _p ) of the foreign particles and settle and separate by gravity.

  On the other hand, only the necessary secondary treatment liquid is taken out from the second separation tank 3, and the separated foreign matter is refluxed from the drain return connection pipe E at the bottom 32 of the second separation tank 3 to the drainage storage tank 1. However, when the separated foreign matter is small, the residence time control valve 13 can be closed during normal operation, opened for maintenance, and the foreign matter settled and separated in the second separation tank 3 can be discharged. It is.

  The inlet 34 of the secondary treatment liquid outlet pipe D opens upwardly below the water surface in the second separation tank 3 at or near the central axis of the swirling liquid flow in the second separation tank. Introduce floating foreign matter floating on the water surface of the second separation tank 3, sedimentary foreign matter settled on the bottom 32, and foreign matter separated into the inner periphery of the second separation tank 3 by the inertial force due to the swirling flow It is possible to discharge the secondary treatment liquid without doing so.

  Moreover, the sedimentary foreign matter that has agglomerated and settled on the bottom portion 32 can be returned to the drainage reservoir 1 from the drainage return connecting pipe E. Here, it is preferable that an air vent valve 15 is provided in the upper part of the second separation tank 3 so that the air accumulated in the second separation tank 3 is discharged to the outside. By providing the air vent valve 15, extra pressure is not applied to the second separation tank 3, the strength of the body portion 31 can be kept low, and the second separation tank 3 can be made compact and low in cost. it can.

  The drainage return pipe C is provided with a primary processing liquid flow rate adjusting valve 12 for adjusting the flow rate of the primary processing liquid, and the secondary processing liquid outlet pipe D is provided with a secondary processing liquid flow meter 16. The pressure applied to the first separation tank 2 and the second separation tank 3 can be adjusted by adjusting the opening degree of the primary treatment liquid flow rate adjustment valve 12, and as a result, the secondary treatment liquid outlet pipe D In addition, the flow rate of the primary treatment liquid and the secondary treatment liquid flowing out to the inter-tank connection pipe B can be adjusted.

  That is, when increasing the flow rate of the primary treatment liquid, the primary treatment liquid flow rate adjustment valve 12 is closed to increase the pressure applied to the first separation tank and the second separation tank. On the other hand, when reducing the flow rate of the primary treatment liquid, the primary treatment liquid flow rate adjustment valve 12 is opened to reduce the pressure applied to the first separation tank and the second separation tank.

  Thus, by providing the primary processing liquid flow rate adjustment valve 12 in the drainage return pipe C, the amount of pressurization can be increased even when the secondary processing liquid outlet pipe D and the inter-tank connecting pipe B are clogged. It is possible to prevent the clogging of the pipe by flushing out the foreign matter. In addition, in order to adjust the flow rate of the processing liquid with the drainage return pipe C having a high flow rate, the flow rate of the primary processing liquid is adjusted with the inter-tank connection pipe B and the secondary processing liquid outlet pipe D, which are thin and have a low flow rate. It is possible to prevent the primary processing liquid flow rate adjustment valve from being blocked as compared with the case.

  Near the liquid level in the upper part of the second separation tank 3, a floating substance return pipe F connected from the vicinity of the liquid level in the upper part of the second separation tank 3 to the drainage return pipe C2 is provided. The return pipe F is provided with a floating substance discharge valve 14. Floating foreign substances that are lighter than the drainage and cannot be separated by centrifugal force or gravity can be discharged from the second separation tank 3 by opening the floating discharge valve 14.

  FIG. 2 is a plan view of the foreign matter separating apparatus according to this embodiment. As shown in this figure, an inter-tank connecting pipe connecting the first separation tank and the second separation tank is provided so that the central axis of the first separation tank 2 and the central axis of the second separation tank 3 coincide with each other. It has been. By arranging the inter-tank connecting pipe in this way, the length of the pipe can be shortened, the entire foreign matter separating apparatus can be made compact, and failures such as blockage of the pipe can be minimized. You can also.

  In the above-described embodiment, the drainage introduction pump 22 is provided in the drainage storage tank as a drive pump. However, a drive pump may be provided in the drainage intake pipe A or the like.

  The sludge treatment apparatus according to the present invention can be applied to various effluents discharged from factories, wastewater treatment facilities, and the like.

The block diagram which shows the foreign material separation device of one Example by this invention The top view which shows the foreign material separator of one Example by this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste liquid storage tank 2 1st separation tank 3 2nd separation tank 11 Drainage introduction pump 12 Primary process liquid flow rate adjustment valve 13 Residence time adjustment valve 14 Floating matter discharge valve 15 Air vent valve 16 Secondary process liquid flow meter 31 Body part 32 Bottom part 33 Outlet 34 Introduction port A Drainage intake pipe B Inter-tank connection pipe C Drainage return pipe D Secondary treatment liquid outlet pipe E Drainage return connection pipe F Floating substance return pipe

Claims (4)

A drainage reservoir to accumulate the waste liquid containing the sludge, the first and the second separation tank for separating the pivots from acquisition the drainage within the foreign matter, the separation of the first from the drainage reservoir A drainage intake pipe for taking the drainage into the tank, the first separation tank and the second separation tank are connected, and the primary treatment liquid from the first separation tank is transferred to the second separation tank. The inter-tank connecting pipe to be introduced, the drainage return pipe for returning the foreign matter separated in the first separation tank to the drainage storage tank, and the secondary treatment for taking out the secondary treatment liquid from the second separation tank A liquid discharge pipe and a drainage return connection pipe provided at a lower portion of the second separation tank and connected to the drainage return pipe, and a turning angular velocity of the first separation tank The residence time of the primary treatment liquid in the second separation tank is adjusted to the drainage return connection pipe so as to be faster than the angular velocity. And a flow rate of the primary treatment liquid flowing into the second separation tank is increased / decreased by adjusting an opening degree of the residence time control valve. A foreign matter separating apparatus for adjusting the swirling angular velocity of the primary treatment liquid. 2. The foreign matter separating apparatus according to claim 1, wherein the secondary processing liquid lead-out pipe has an opening surface into which the secondary processing liquid flows in an upward direction below a water surface in the second separation tank. The foreign matter separating apparatus according to claim 2, wherein an air vent valve is provided at an upper portion of the second separation tank. A floating substance return pipe that connects the upper part of the second separation tank and the drainage return pipe and returns floating foreign substances accumulated in the upper part of the second separation tank to the drainage storage tank. Item 4. The foreign matter separating apparatus according to Item 2 or 3.

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