JP5336838B2 - Start-up method of moving bed type filtration equipment - Google Patents

Description

  The present invention relates to a method for starting a moving bed type filtration apparatus. More specifically, the present invention relates to a starting method such as after a pause of an air lift pump disposed inside a moving bed type filtration apparatus.

  In the moving bed type filtration apparatus, as shown in FIG. 5, a cross-flow moving bed type filtration apparatus 100 </ b> A (see FIG. 5A) that performs filtration by flowing raw water sideways inside the filter medium 101 filled in the moving bed type filtration apparatus 100. ), And an upward moving bed type filtration device 100B (see FIG. 5B) for filtering the raw water by flowing it upward. In any of the moving bed type filtration devices (100A, 100B), the turbidity in the raw water is filtered by the filter medium 101 as the raw water moves while the filter medium 101 moves slowly from the upper part to the lower part, and the moving bed type filtration apparatus. The mixture of the suspended matter 104 and the filter medium 101 stacked at the lower part of the apparatus 100 is introduced into the interior from the lower end inlet 105 of the air lift pump 102 installed in the moving bed type filtration apparatus 100 and carried to the upper part (see FIG. 6). ), The mixture is washed by the filter medium washer 103 arranged at the upper part, and only the washed filter medium 101 is returned from the upper part of the moving bed type filtration device 100, so that the raw water can be continuously filtered. Type filtration device.

  When the operation of the moving bed type filtration device 100 is temporarily suspended or suspended due to a power failure, repair, or the like, the mixture of the suspended matter 104 and the filter medium 101 that has been rising in the air lift pump 102 becomes the air lift pump 102. When the filter medium is filtered by filtering the raw water containing high-viscosity turbidity (not shown), the layer 106 is formed by the self-weight and compacted over time to form a layer 106 (see FIG. 7). The layers are formed while the filter media are bonded together by their own weight to form a lump, and in any case, the lower part of the air lift pump 102 is blocked.

  When the lower part of the air lift pump 102 is closed, the air sent into the air lift pump 102 at the start of startup cannot rise in the air lift pump 102, and the moving bed is moved from the lower part of the air lift pump 102 as shown in FIG. 7A. 7 is ejected in the direction of the arrow X, and as shown in FIG. 7B, the air lift pump 102 is in a so-called empty state where only air rises in the direction of the arrow Y. As described above, when the movement of the filter medium 101 is stopped and the state in which the filter medium 101 is not washed continues, the moving bed type filtration apparatus 100 falls into a process impossible state and stops.

  As a starting method when the air lift pump is blocked and the mixture of turbidity and filter media cannot be discharged normally, a method of supplying more than twice the air normally used in the air lift pump at the start of the start, or in the air lift pump There is a method of supplying water together with air. Also, in the following document, the start-up water is supplied from the bottom of the tank before the start of the air lift pump, air is sent into the air lift pump after detecting the expansion of the deposit by the interface detection mechanism, and the start-up water is supplied after a certain time. A way to stop is proposed.

  However, in the method of supplying more than twice the air normally used in the air lift pump at the start of startup, the air is pumped back without breaking the solid turbidity and filter media layers, and air is ejected from the lower part of the air lift pump There was a problem. In addition, in the method of supplying water together with air from the air inlet to the air lift pump at the time of start-up, the air rises from the lower part of the air lift pump through the jetting device before sufficiently breaking down the compacted suspended matter and filter medium layer. Only the air rises in the air lift pump. Once this flow was made, there was a problem that the air lift pump could not be started because water would flow in the same way. In addition, the method described in the following document has problems that it is necessary to unravel the deposit on the entire bottom of the apparatus in order to supply startup water from the tank bottom, and a mechanism for detecting the degree of unraveling is required. Furthermore, when the object to be solved has a high specific gravity such as sand, there is a problem that the obstruction in the air lift pump cannot be solved from the bottom of the tank.

Utility Model Application Notice H01-27918

  The present invention has been made to solve such problems. The purpose of the present invention is to temporarily stop the moving bed type filtration device, and the mixture of turbidity and the filter medium accumulates in the lower part of the air lift pump. Even if the air lift pump is blocked by forming a layer, the start method of the moving bed type filtration device that can discharge the mixture of turbidity etc. and filter media from the air lift pump normally at the start of start Is to provide.

In order to achieve the above object, the method of starting the cross-flow moving bed type filtration apparatus or upward moving bed type filtration apparatus according to claim 1 of the present invention is filled with a filter medium inside, and an air lift pump is arranged inside. the mixture of the air lift the pump and turbid quality toward the bottom to top and front Symbol filter media is transported, the mixture at the filter medium washer disposed on top is cleaned, washed the filter medium is returned to the inside In the start-up method of the cross-flow moving bed type filtration device or the upward moving bed type filtration device in which the filtration is continuously performed, the suspended matter and the filter medium blocking the lower part in the air lift pump at the start of the start-up. In order to remove the mixed layer, water is supplied first, and then supply of air is started.

Moreover, the starting method of the crossflow moving bed type filtration apparatus or upward moving bed type filtration apparatus according to claim 2 of the present invention is the same as that of the crossflow moving bed type filtration apparatus or upward moving bed type filtration apparatus according to claim 1. In the start-up method, the water supply time is from 10 seconds to 300 seconds.

Also, starting the cross flow moving bed filtration apparatus or upward moving bed filtration apparatus according to claim 3 of the present invention, the cross flow moving bed filtration apparatus or upward moving bed according to claim 1 or claim 2 In the starting method of the type filtration apparatus, one or more of dredged sand or manganese sand, fiber filter medium, and plastic filter medium is used as the filter medium.

  In the starting method of the moving bed type filtration apparatus of the present invention having the above-mentioned configuration, since water is first supplied into the air lift pump at the start of starting, the turbidity and the filter medium layer that has been compacted are softly solved, Next, since air is supplied, the dissolved layer becomes a mixture of turbidity and filter medium, and the air lift pump is transported from the lower part to the upper part. It can be operated with the probability of

  In particular, since the supply time of only water is initially within 10 to 300 seconds, the amount of water used can be reduced and the air lift pump can be operated reliably.

  Note that it is preferable to use one or more of dredged sand or manganese sand, fiber filter medium, and plastic filter medium as the filter medium.

  Preferred embodiments of the present invention will be described below with reference to the drawings. However, the scope of the present invention is not intended to be limited to the contents described in this embodiment unless otherwise specified.

  FIG. 1A is a schematic explanatory view of a cross-flow moving bed type filtration device 1A in the moving bed type filtration device 1 according to the embodiment of the present invention, and FIG. 2 is installed inside the cross-flow moving bed type filtration device. It is an expansion schematic explanatory drawing of the air lift pump 10 which is.

  As shown in FIG. 1, in the cross-flow moving bed type filtration apparatus 1 </ b> A, the inside of the apparatus 6 is filled with a filter medium 30, and the air lift pump 10 is disposed inside. In addition, the filter upper part 7 is provided with a filter medium cleaner 20 for cleaning the mixture of the suspended matter 31 and the filter medium 30. Further, the inlet 3 for allowing the raw water mixed with the turbidity 31 to flow into one apparatus side 2 is filtered, and the turbidity 31 is filtered by the filter medium 30 to the other apparatus side 4 opposite to the inlet 3. An outlet 5 for discharging water is installed.

  Next, the flow of the filtration process in the cross flow moving bed type filtration apparatus 1A will be described. As shown in FIG. 1A, raw water is introduced from an inlet 3 installed in one apparatus side 2, passes through a filter medium 30 filled in the apparatus interior 6, and is installed in another apparatus side 4. The water flows in the lateral direction, which is the direction of arrow A, so that the filtered water flows out from the outlet 5.

  Further, the mixture 40 of the suspended matter 31 and the filter medium 30 accumulated in the lower part 8 of the apparatus by filtering the raw water is introduced in the direction of arrow B from the inlet 11 at the lower end of the air lift pump 10 provided in the center of the apparatus interior 6. 13 is carried to the upper part (see FIG. 2), and flows into the filter medium washer 20 disposed in the upper part in the direction of arrow C to wash the mixture 40 of the suspended matter 31 and the filter medium 30 and then washed. Only the filtered medium 30 is returned in the direction of the arrow D from the upper part 7 of the apparatus, slowly falls from the top to the bottom and accumulates in the lower part 8 of the apparatus, and the suspended matter 31 is discharged from the filter medium cleaner 20 to the outside in the direction of the arrow E. The

  When the operation of the cross-flow moving bed type filtration device 1A is temporarily suspended or suspended due to a power failure or repair, the mixture 40 of the suspended matter 31 and the filter medium 30 that has been rising in the air lift pump 10 becomes the air lift. As shown in FIG. 3A, a layer 41 is formed which is compacted by the dead weight of the filter medium 30 and mixed with the passage of time to form a mixed layer 41 of the turbid material 31 and the filter medium 30 and closes the lower part of the air lift pump 10. .

  At the start of activation of the cross-flow moving bed type filtration apparatus 1A, as shown in FIG. 3A, only water is introduced in the direction of arrow F for about 300 seconds from the air inlet 12 formed on the lower side surface of the air lift pump 10. Thereby, the layer 41 in which the compacted turbidity 31 and the filter medium 30 are mixed is dissolved and softened (see FIG. 3B). Next, as shown in FIG. 3C, water and air are similarly introduced from the air inlet 12 in the direction of arrow F for about 300 seconds. Thereby, the layer in which the compacted turbidity 31 and the filter medium 30 that have been dissolved by water are mixed is further clarified to become a mixture 40 of the turbidity 31 and the filter medium 30, and the inside of the air lift pump 10 from the lower part to the upper part. Can be carried in the direction of arrow G. Thereby, it becomes possible to operate the air lift pump 10 at the start of activation with a probability of 95% or more.

The supply time of only water supplied at the start of activation is preferably set in the range of 10 to 300 seconds, more preferably in the range of 30 to 120 seconds.
As shown in FIG. 4, the supply of water for 300 seconds or more is not advantageous because the amount of water used increases. In addition, the supply of water for 10 seconds or less takes a short time to solve the blocked air lift.
Note that it is possible to start air lift by arbitrarily supplying air after 10 seconds after the preceding time of water. At this time, there is no difference in effect even if the supply of water is stopped or continued at the time of air supply.

  In addition, in this embodiment, as shown in FIG. 1, although the case where the cross-flow moving bed type filtration apparatus 1A (refer FIG. 1A) with which raw water flows laterally about the moving bed type filtration apparatus 1 was used was demonstrated, The upward moving bed type filtration apparatus 1B (see FIG. 1B) that flows in the direction of the arrow H from the bottom to the top may be used.

It is a schematic sectional explanatory drawing of the moving bed type filtration apparatus concerning the embodiment of the present invention. It is an expansion schematic section explanatory view of the air lift pump at the time of normal operation concerning the embodiment of the present invention. It is an expansion outline section explanatory view of the air lift pump at the time of starting start concerning the embodiment of the present invention. It is a graph which shows the relationship between the prior water supply time and air lift starting rate which concern on embodiment of this invention. It is a schematic sectional explanatory drawing of the crossflow moving bed type filtration apparatus of a prior art example. It is an expansion schematic sectional explanatory drawing of the air lift pump at the time of normal operation of a prior art example. It is an expansion schematic sectional explanatory drawing of the air lift pump at the time of the starting start of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Moving bed type filtration apparatus 2, 4 Apparatus side part 3,11 Inlet 5 Outlet 6 Inside of apparatus 7 Upper part of apparatus 8 Lower part of apparatus 10 Air lift pump 12 Air inlet 13 Inside 20 Filter medium washer 30 Filter medium 31 Turbidity 40 Mixture 41 Layer

Claims (3)

Internal filter material is filled in an internal airlift pump is disposed, said mixture of air lift the pump from the bottom and turbid quality toward upper and front Symbol filter media is transported, the filter medium washer disposed on the top In the start-up method of the cross-flow moving bed type filtration device or the upward moving bed type filtration device in which the mixture is washed and the washed filter medium is returned to the inside to continuously perform filtration,
A transverse flow moving bed system characterized in that at the start of startup, water is supplied first to remove a layer of mixed turbidity and filter medium blocking the lower part in the air lift pump, and then the supply of air is started. Start-up method of filtration device or upward moving bed type filtration device. In the starting method of the crossflow moving bed type filtration apparatus or the upward moving bed type filtration apparatus according to claim 1,
The method for starting up the cross-flow moving bed type filtration apparatus or the upward moving bed type filtration apparatus, wherein the water supply time is 10 seconds to 300 seconds. In the starting method of the crossflow moving bed type filtration apparatus or the upward moving bed type filtration apparatus according to claim 1 or 2,
One or more of dredged sand, manganese sand, fiber filter medium, and plastic filter medium is used as the filter medium. A starting method for a cross-flow moving bed type filter apparatus or an upward moving bed type filter apparatus.

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