阅读说明：本技术 分离装置 (Separating device ) 是由 大竹可峻 川本康人 黑泽裕贵 金泽康平 石田孝太郎 植木阳花 于 2019-06-28 设计创作，主要内容包括：一种分离装置包括：分离槽；设在分离槽内的分隔构件,其包含竖立部分及横向部分,竖立部分具有比分离槽的侧壁中的每一个的高度低的高度,横向部分设置于竖立部分与所述侧壁之间,将分离槽的内部分隔成液体的流入区域和流出区域；在流入区域中敞开的入口,其下部水平面设定成低于竖立部分的上端,其上部水平面设定成高于该上端；筛,其在分隔构件中沿着流入至流入区域中的流动方向设置于竖立部分中；在分隔构件中与流入至流入区域中的流动方向相交地设置于竖立部分中的旋转诱导构件；在分隔构件中设置于横向部分中的筛件；与入口相对地设置的分割构件；沿被分割构件分割的液体的流动方向设置于下游侧的保持构件；在流出区域中敞开的出口。(A separation device comprising: a separation tank; a partition member provided in the separation tank, the partition member including an upright portion having a height lower than a height of each of the side walls of the separation tank, and a lateral portion provided between the upright portion and the side walls, the lateral portion partitioning the interior of the separation tank into an inflow region and an outflow region of the liquid; an inlet opening in the inflow region, a lower level thereof being set lower than an upper end of the rising portion, an upper level thereof being set higher than the upper end; a screen provided in the standing part in the partition member in the flow direction flowing into the inflow region; a rotation inducing member provided in the standing portion in the partition member so as to intersect with the flow direction flowing into the inflow region; a screen provided in the transverse portion in the partition member; a partition member disposed opposite to the inlet; a holding member provided on a downstream side in a flow direction of the liquid divided by the dividing member; an outlet opening in the outflow region.)

1. A separation device that separates a substance that is contained in a liquid and has a specific gravity smaller than that of the liquid, the separation device comprising:

a separation tank;

a partition member that is provided in the interior of the separation tank, that includes an upright portion having a height lower than that of each of the side walls of the separation tank, and a lateral portion that is provided between the upright portion and the side walls of the separation tank, and that partitions the interior of the separation tank into an inflow region and an outflow region of liquid;

an inlet opening in the inflow region, a lower level of the inlet being set lower than an upper end of the upright portion of the partition member, and an upper level of the inlet being set higher than the upper end, and liquid flowing into the inflow region through the inlet;

a sieve that is provided in the upright portion in the partition member in a flow direction of the liquid flowing into the inflow region, and through which the liquid is transferred from the inflow region to the outflow region;

a rotation inducing member that is provided in the standing portion intersecting with a flow direction of the liquid flowing into the inflow region in the partition member and induces the liquid to rotate;

a screen disposed in the transverse portion in the partition member and through which liquid passes from the inflow region to the outflow region;

a dividing member that is provided opposite to the inlet and divides the liquid flowing in from the inlet into flows along a side wall of the separation tank;

a holding member that is provided on a downstream side in a flow direction of the liquid divided by the dividing member and that holds the substance that is contained in the liquid and has a specific gravity smaller than that of the liquid; and

an outlet which is open in the outflow region and through which liquid flows out of the outflow region.

2. The separation device of claim 1, further comprising:

a guide member that is provided between the inlet and the dividing member and between a lower horizontal surface and an upper horizontal surface of the inlet opposite to the inlet, and guides the liquid flowing into the inflow region by dividing the liquid into a flow toward the dividing member and a flow toward a rotation inducing member provided in the upright portion.

3. The separation device of claim 1, further comprising:

a plurality of guide members respectively formed at opposite sides of an inlet opened in the inflow region, and each of the plurality of guide members has a height higher than an upper level of the inlet and guides the liquid to flow toward the dividing member.

4. The separation device according to claim 1, wherein a downstream side of the holding member provided along a downstream side in a flow direction of the liquid divided by the dividing member is provided with a discharge path having a bottom surface formed on substantially the same level as a lower level of the inlet, and including a discharge port opened in the bottom surface and an on-off valve.

5. The separation device according to claim 1, wherein a downstream side of the holding member provided along a downstream side in a flow direction of the liquid divided by the dividing member is provided with a level maintaining path having an opening formed at a position higher than an upper level of the inlet and lower than an upper end of a side wall of the separation tank, and a wall surrounding the level maintaining path having a height higher than the opening of the level maintaining path and having a passage for the liquid formed at a position lower than the opening of the level maintaining path.

Technical Field

The present invention relates to a separation device for separating a substance contained in, for example, a liquid (such as discharged liquid or discharged water from a plant) and a solid, the substance having a specific gravity smaller than that of the liquid and thus floating on the liquid, and the solid having a specific gravity larger than that of the liquid.

Background

As a device for separating solids contained in the discharged liquid, for example, a separation device described in patent document 1 has been proposed. The separation device separates solids by providing a screen for separating solids with the discharged liquid stream.

The separation device described in patent document 1 includes a separation tank that is partitioned into an inflow chamber and an outflow chamber by using a sieve, an inlet through which the discharged liquid flows is provided in an end surface of one side of the inflow chamber, and a inducing portion that rotates the discharged liquid in the interior of the inflow chamber is provided on the end surface and an end surface opposite to the end surface. Furthermore, the screen is provided on the side surface along the flow of discharged liquid rotating in the inflow chamber.

An outlet for enabling the discharge liquid to flow out to the outside of the separation tank after separating the solids is connected to the outflow chamber, and an outflow pipe connected to the outlet extends with an upward gradient up to a position corresponding to a level substantially equal to the level of the inlet.

In the separation device, as the discharge liquid flows from the inlet into the inflow chamber, the water level in the inflow chamber and the outflow chamber rises. Furthermore, when the water level in the inflow chamber rises above the lower level of the inlet, the liquid flows out through an outflow pipe extending from the outlet. When the discharged liquid continuously flows into the inflow chamber and flows out from the outflow chamber, the discharged liquid flowing into the inflow chamber flows along the surface of the sieve while rotating due to the induction of the induction portion.

Furthermore, during the rotation of the discharged liquid in the inflow chamber, the solids are deposited in the interior of the inflow chamber without passing through the sieve and the liquid components pass through the sieve and flow to the outflow chamber, thereby enabling separation of the solids contained in the discharged liquid. In addition, the solids deposited in the inflow chamber are discharged, for example, by opening a discharge valve provided in the bottom part of the inflow chamber or by opening the upper part of the inflow chamber and using a bucket or the like.

CITATION LIST

Patent document

Patent document 1: JP 4668290B 2

Disclosure of Invention

Technical problem

In the invention described in patent document 1, the upper portion of the inflow chamber is closed, the inflow of the discharged liquid becomes a rotating flow in the inflow chamber, and the solids are separated during this rotation. For this reason, for example, when oil or the like is contained in the discharged liquid, separation of such substances is impossible.

The discharged liquid or discharged water from the plant usually contains a substance such as oil or the like, which has a specific gravity smaller than that of the liquid component of the discharged liquid or discharged water, and the substance must be removed before discharge or in the case of reuse. For this purpose, the oil or the like contained in the discharge liquid or the discharge water is treated in the treatment apparatus. However, the treatment apparatus removes all of the oil or the like contained in the discharged liquid or the discharged water, which is a very burdensome process.

Therefore, if a large part of oil or the like contained in the discharged liquid or the discharged water can be removed in the upstream side of the treatment apparatus, the burden of the treatment apparatus can be reduced, which is advantageous. Therefore, in practice, it is necessary to develop a separation apparatus which can remove substances contained in the discharged liquid or discharged water from the plant and floating due to its low specific gravity.

An object of the present invention is to provide a separation device capable of separating a substance contained in a liquid and having a specific gravity smaller than that of the liquid, and separating a solid having a specific gravity larger than that of the liquid.

Solution to the problem

A representative separation device according to the present invention for solving the above-described problems is a separation device that separates a substance that is contained in a liquid and has a specific gravity smaller than that of the liquid, the separation device including: a separation tank; a partition member that is provided in the interior of the separation tank, that includes an upright portion having a height lower than a height of each of the side walls of the separation tank, and a lateral portion that is provided between the upright portion and the side walls of the separation tank, and that partitions the interior of the separation tank into an inflow region and an outflow region of the liquid; an inlet opening into the inflow region, a lower height of the inlet being set lower than an upper end of the standing portion of the partition member and an upper height thereof being set higher than the upper end, and liquid flowing into the inflow region through the inlet; a sieve which is provided in the standing part in the partition member in a flow direction of the liquid flowing into the inflow region, and through which the liquid is transferred from the inflow region to the outflow region; a rotation inducing member that is provided in the standing portion intersecting with a flow direction of the liquid flowing into the inflow region in the partition member, and induces the liquid to rotate; a screen disposed in the transverse portion in the partition member and through which liquid passes from the inflow region to the outflow region; a dividing member that is disposed opposite to the inlet and divides the liquid flowing in from the inlet into flows along a side wall of the separation tank; a holding member that is provided on a downstream side in a flow direction of the liquid divided by the dividing member and holds a substance that is contained in the liquid and has a specific gravity smaller than that of the liquid; and an outlet opening into the outflow region and through which liquid flows out of the outflow region.

Advantageous effects of the invention

The separation device according to the present invention can separate substances (for example, particles such as solids, which may float on a liquid like floating debris, or oil, hereinafter referred to as "float") having a specific gravity smaller than that of the liquid and solids (hereinafter simply referred to as "solids") having a specific gravity larger than that of the liquid, contained in the liquid such as discharged liquid or discharged water from a plant.

The separation tank is partitioned into an inflow region and an outflow region by a partition member provided in the separation tank. The liquid flows into the inflow region through the inlet, and flows to a downstream side along a sidewall of the separation tank through a partition member provided opposite to the inlet. The float also flows with the liquid flow to the downstream side and is trapped in the holding member. Further, the solids are separated from the liquid by the screen provided in the upright portion of the partition member and the screen provided in the transverse portion, and are retained in the inflow region.

Furthermore, liquid that passes through the screen provided in the upright portion of the partition member and the screen provided in the transverse portion and is separated from the floating objects and solids flows out to the outflow region. Thus, the float flows in the upper layer of the inflow region and is arrested in the holding portion, solids are held on the bottom surrounded by the screens of the transverse portion and the upright portion, and liquid separated from the float and solids flows out of the outlet through the outflow region.

Drawings

Fig. 1 is a plan view for describing the configuration of the separation device.

Fig. 2 is a side view for describing the configuration of the separation device.

Detailed Description

Hereinafter, the separation device according to the present invention will be described. The separation device according to the present invention can separate substances (floating matters) contained in, for example, a liquid such as a discharged liquid or discharged water from a factory, the substances having a specific gravity smaller than that of the liquid and thus floating on an upper layer of the liquid, and solids having a specific gravity larger than that of the liquid.

A method for separating floating materials and solids contained in a liquid by using the separation apparatus according to the present invention will be briefly described. In the separation device according to the present invention, first, the liquid containing the float and the solid and flowing into the separation tank is divided into an upper layer portion above a predetermined level as a planar flow and a lower layer portion below the level as a rotational flow.

The planar flow of the upper layer portion is a flow along the side wall of the separation tank, which causes stagnation of the fluid flow on the downstream side. As a result, the float can be floated on the surface of the planar flow. Further, the float can be maintained by maintaining a state in which the float floats on the surface of the liquid. At this time, by making a part of the retained liquid flow downward, the liquid containing the floating matter can be made to continue to flow along the side wall of the separation tank.

Further, the solids contained in the liquid flowing in the upper portion fall down during the flow and are not passed through the sieve disposed laterally at a predetermined height position but are held on the sieve so as to be separated from the liquid. By doing so, solids can be separated from liquids.

In addition, the flow of the liquid of the lower layer portion below the predetermined level is a high-speed rotating flow, and in the process of maintaining the rotating state, the solid contained in the liquid is separated from the liquid without passing through the screen. By doing so, solids can be separated from liquids. Further, when the liquid flows into the separation tank, the float caught in the lower layer part and passing through the screen together with the liquid may float after passing through the screen due to a decrease in the flow rate of the liquid, and join the planar flow of the upper layer part, thereby being separated from the liquid, as described above.

The configuration of the separation device according to the present embodiment will be described with reference to the accompanying drawings. The separation device a includes a separation tank 1, and the separation tank 1 is partitioned into an inflow region B into which liquid flows and an outflow region C from which the liquid flows out by means of a partition member 2 provided in the interior of the separation tank 1 after separation of flotage and solid.

The separation tank 1 includes a tank portion 1a having a predetermined planar dimension and a predetermined depth dimension and in which the partition member 2 is provided, and a discharge portion 20 shallower than the tank portion 1a is formed at an end portion on the downstream side in the flow direction of the liquid flowing into the inflow region B. The discharge portion 20 is configured to perform a function of discharging the floating objects and a function of maintaining a level in the separation tank 1, as will be described later. Further, a deposition portion 1c in which a solid separated from the liquid is deposited is provided on the bottom portion of the groove portion 1a, and a deposit discharge pipe 1d is connected to the deposition portion 1 c.

The partition member 2 includes an erected portion 3 and a lateral portion 4, the erected portion 3 having a size smaller than that of the groove portion 1a of the separation groove 1, the lateral portion 4 being disposed in a gap formed between the erected portion 3 and the groove portion 1 a. The standing portion 3 includes one end wall 3b and a pair of side walls 3a standing in the flow direction of the liquid, the one end wall 3b being standing and simultaneously connected to the end portions of the side walls 3a in the direction intersecting the flow of the liquid. The position of the upper end 3c of the standing part 3 is set to be sufficiently lower than the position of the upper end 1e of the separation tank 1, and the upper surface of the standing part 3 is opened.

A sieve 3d is provided on the side wall 3a of the upright portion 3, and a rotation inducing member 3e inducing rotation of the inflowing liquid is provided on the end wall 3b and the end wall 1f of the separation tank 1.

Further, a pair of side walls 3a of the standing part 3 need not necessarily be included, and one side wall may be shared as the side wall 1g of the separation tank 1. Further, the number of the end walls 3b may not necessarily be one, and a pair of the end walls 3b may be provided in a direction intersecting the liquid flow.

The lateral portion 4 constituting the partition member 2 is provided at a position lower than the upper end 3c of the upright portion 3 in a gap formed between the upright portion 3 and the groove portion 1a of the separation groove 1 in a state of being inclined downward from the upstream side to the downstream side in the flow direction of the liquid in the inflow region B. In particular, the end portion 4a on the upstream side in the flow direction of the liquid and the end wall 1f of the separation tank 1 do not contact each other and form a gap therebetween. Further, the screens 4b are respectively provided at positions corresponding to the screens 3d provided on the side walls 3a of the upright portions 3, and plate portions 4c (through which liquid does not pass) are formed on the more downstream side in the flow direction of the liquid than the screens 4 b.

Therefore, such a region is an inflow region B of liquid: this region includes a space in a plane surrounded by the pair of side walls 3a and end walls 3b of the standing portion 3 and the end wall 1f of the groove portion 1a and a space which is a gap between the standing portion 3 and the groove portion 1 and is higher than the lateral portion 4 in the separation groove 1. Further, such a region is an outflow region C: this region is a gap between the end walls 1f and 1h and the side wall 1g of the groove portion 1a and the upright portion 3, and the upper portion thereof is defined by the lateral portion 4.

Further, the structure of the sieves 3d and 4b is not particularly limited, and any structure having a function of passing a liquid without passing a solid having a previously assumed size may be used. As the above-mentioned sieve, for example, a punched metal having a number of holes with a predetermined size formed therein may be used.

The inlet 6 is provided at a position in the end wall 1f of the separation tank 1 such that its lower level 6a is lower than the upper end 3c of the upright portion 3 constituting the partition member 2 and its upper level 6b is higher than the upper end 3 c. Further, an inflow pipe 7 connected to a liquid supply source (not shown) is connected to the inlet 6 so that liquid containing floating matters and solids flows into the inflow region B of the separation tank 1.

In particular, a plurality of guide portions 3f each having a height higher than the upper horizontal surface 6b of the inlet 6, which sandwich the inlet 6 therebetween and can guide the flow direction of the liquid flowing in from the inlet 6, are formed in the portion of the upright portion 3 that constitutes the partition member 2.

The partition member 9 is disposed opposite to the inlet 6. The partition member 9 partitions the liquid flowing into the inflow region B from the inlet 6 into flows along the side wall 1g of the separation tank 1, and the collision portion 9a opposite to the inlet 6 has an arc shape when viewed from a plane. Further, the partition member 9 is formed such that the maximum width portion 9b of the collision portion 9a has a size larger than the width size of the pair of standing portions 3 of the partition member 2, and parallel portions 9c (the width size therebetween is smaller than the width size of the maximum width portion 9 b) are formed on the more downstream side in the flow direction than the maximum width portion 9 b.

The maximum width portion 9b of the partition member 9 has a width dimension larger than that between the pair of standing portions 3. Thus, the partition member 9 is placed on the upper end 3c of the standing part 3. For this reason, a part of the liquid flowing into the inflow region B above the upper end 3c of the standing part 3 collides with the collision part 9a of the partition member 9 to flow along the side wall 1g of the separation tank 1, thereby flowing toward the downstream side along the parallel part 9 c.

In the present embodiment, the liquid flowing into the inflow region B from the inlet 6 is substantially equally divided into flows along the two side walls 1g of the separation tank 1 by the dividing member 9. However, the liquid does not necessarily have to be divided equally, and the flow along the side walls 1g may be changed by providing the dividing member 9 so as to be biased to any one of the side walls 1 g.

The holding member 10 is provided on the downstream side of the dividing member 9. The dividing member 9 and the holding member 10 have different functions and can be implemented independently of each other. However, in the present embodiment, the holding member 10 is formed substantially integrally with the partition member 9.

That is, since it is sufficient that the partition member 9 can perform a function of partitioning the inflowing liquid into flows along the side wall 1g of the separation tank 1, the collision portion 9a is formed by bending a flat bar into an arc shape, and the parallel portions 9c parallel to each other are continuously formed from the maximum width portion 9b of the collision portion 9 a. Thus, a region surrounded by the partition member 9 is formed, and the region becomes a holding portion of the holding member 10.

The holding member 10 is formed by closing the planar area surrounded by the partition member 9 as described above with the bottom plate 10 a. Specifically, the restraining portions 10b are formed by bending the free ends of the parallel portions 9c of the partition member 9 so that the free ends are spaced apart from the side walls 1g of the separation tank 1, respectively (so that the free ends of the pair of parallel portions 9c approach each other). Therefore, the holding member 10 has a container-like shape by closing the bottom portion of the region (the outer circumference of which is surrounded by the partition member 9) with the bottom plate 10a, and is configured so that the leakage of the float introduced together with the liquid flow can be suppressed by the suppression portion 10 b.

The position of the bottom plate 10a constituting the holding member 10 in the separation groove 1 in the depth direction coincides with the position of the upper end 3c of the standing part 3 constituting the partition member 2, and the upper part of the standing part 3 is closed with the bottom plate 10 a. For this reason, a rotational flow of liquid in the upright portion 3, which will be described later, may be induced.

Further, the end portion 10c of the bottom plate 10a is set to be disposed at a position slightly rearward from the suppression portion 10b toward the collision portion 9a of the partition member 9, and the position of the free end of the suppression portion 10b substantially coincides with a line extending upward from the end wall 1h of the groove portion 1a of the separation groove 1. Therefore, the liquid introduced into the holding member 10 flows through the surface defined by the end portion 10c of the bottom plate 10a, the suppression portion 10b, and the end wall 1h of the separation tank 1, and flows toward the plate portion 4c constituting the lateral portion 4 of the partition member 2.

The guide member 12 is provided opposite the inlet 6 between the inlet 6 and the partition member 9 and between the lower horizontal surface 6a and the upper horizontal surface 6b of the inlet 6. The guide member 12 guides the upper layer liquid flow flowing in from the inlet 6 into a planar flow toward the partition member 9, and guides the lower layer liquid flow into a flow toward the rotation inducing member 3e provided in the end wall 3b of the upright portion 3.

In particular, the guide member 12 is formed in a flat plate shape, and an end portion 12a opposite to the inlet 6 has a curved shape whose central portion is concave when viewed from a plane. For this reason, even in the case where the solid contained in the inflowing liquid is captured by the end portion 12a, the solid is transported to the central portion due to the flow of the inflowing liquid, and thus may leak out due to the swirling flow in the lower side.

An outlet 13 is formed at a position corresponding to the outflow region C of the separation tank 1, and an outflow pipe 14 is connected to the outlet 13. The outflow pipe 14 is formed to rise from the outlet 13 so that the end portion on the outflow side reaches substantially the same level as the inlet 6 or a level slightly lower than the inlet 6. Therefore, when the separation tank 1 is completely filled, the liquid in the outflow region C starts flowing from the end portion of the outflow pipe 14, and a liquid flow can be formed in the interior of the separation tank 1.

The discharge portion 20 provided in the separation tank 1 is configured to be able to perform a function of discharging the floating matter floating on the surface layer of the inflow region B and held in the holding member 10 and a function of maintaining the water level in the separation tank 1. The height position of the bottom plate 20a of the discharge portion 20 is substantially the same as the lower level of the opening of the inlet 6 in the end wall 1f of the separating tub 1, and is slightly lower than the height position of the bottom plate 10a of the holding member 10. Further, the discharge portion 20 is defined by side walls 20b and end walls 20c connecting the side walls 20b to each other, the side walls 20b each having the same height as that of each side wall 1g of the separating tank 1 and standing around the bottom plate 20 a.

A discharge pipe 21 for discharging the floating matters formed in the bottom plate 20a is connected to the discharge part 20, and the discharge pipe 21 may be opened or closed with a valve (not shown). In addition, a guide plate 22 that guides the flow of liquid is provided around the discharge pipe 21 from the side wall 20B toward the end wall 20c, and the liquid above the bottom plate 20a in the inflow region B can flow toward the discharge pipe 21 through a gap between the guide plate 22 and the end wall 20 c. However, in a state where the discharge tube 21 is closed, the liquid does not flow out through the discharge tube 21, and stagnation of the liquid occurs in the discharge portion 20.

The overflow pipe 23 is connected to the discharge portion 20. The overflow pipe 23 has the function of maintaining a predetermined maximum level in the separation tank 1. For this, the overflow pipe 23 passes through the bottom plate 20a and has an opening formed at a position corresponding to the maximum level height. Furthermore, overflow tube 23 is surrounded by retaining wall 24, retaining wall 24 being formed continuously from side wall 20b to end wall 20c and higher than overflow tube 23. In addition, a gap 24a is formed between the holding wall 24 and the bottom plate 20a so that liquid can flow in through the gap 24 a.

Next, the operation of the separation apparatus a having the configuration as described above when separating the floating materials and the solids contained in the liquid will be described. When the inside of the separation tank 1 is completely filled, separation of the float and the solid by the separation device a is performed, and a state where the liquid flows out through the outflow pipe 14 is maintained.

The liquid flowing from the inlet 6 into the inflow region B is divided into two flows by the guide member 12. That is, the liquid above the guide member 12 collides with the collision portion 9a of the partition member 9 provided opposite to the inlet 6, and flows along the side wall 1g of the separation tank 1. Further, a part of the flow becomes a flow toward the holding member 10, and a part of the flow flows above the side wall 3a of the upright portion 3 and then flows toward the screen 4b of the lateral portion 4 along the side wall 1g of the separating tank 1.

The flows along the side wall 1g of the separation tank 1 join each other at a portion corresponding to the restraining portion 10b of the holding member 10. However, due to the collision of the flows at the merging portion, the liquid surface rises slightly, which introduces the float partly into the holding member 10. Furthermore, the flow of the float caused by the rise of the surface of the liquid is directed not only to the holding member 10 but also to the discharge portion 20. Each float is maintained in an introduced state since liquid does not actively flow in the holding member 10 and the discharging part 20. Specifically, the flow of the float introduced into the holding member 10 out of the holding member 10 is suppressed by the suppressing portion 10b so that the float is continuously held in the holding member 10.

However, a gap is formed between the end portion 10c of the bottom plate 10a of the holding member 10 and the end wall 1h of the separation groove l, and the liquid flows through the gap. Therefore, the flow of the liquid along the side wall 1g divided by the dividing member 9 can be continued. In particular, since the plate portion 4c (through which liquid does not pass) is formed at a more downstream side in the flow direction of the liquid than the sieve 4b of the transverse portion 4 adjacent to the end wall 1h of the separation tank 1, the liquid can flow at a reduced flow rate.

As described above, the float in the upper layer of the inflowing liquid is held in the holding member 10 and in the discharge portion 20.

In addition, the liquid below the guide member 12 flows along the side wall 3a of the upright portion 3 toward the end wall 3b, and a swirling flow is formed by the rotation inducing member 3 e. The swirling flow is formed in a space defined by a pair of side walls 3a, an end wall 3b, and an end wall 1f of the separation tank 1. Furthermore, during the rotation of the liquid, only the liquid passes through the screen 3d and flows into the outflow region C. At this time, the solids that are not retained through the screen 3d leak out from the rotating flow and are deposited on the possible deposition portion 1 c.

The float contained in the liquid flowing into the inflow region B does not always float, but is generally mixed with the liquid. Thus, when the liquid is divided by the guide member 12, the float is caught in the rotating flow in some cases. Such floats pass through the screen 3d and move with the liquid to the outflow region C. However, since the flow rate of the liquid in the outflow region C is low, there is a possibility that the float rises in the liquid. Further, even in the case where the float collides with the lateral portion 4 during ascent, the float may continuously ascend along the slope of the lateral portion 4, flow from the end portion 4a into the inflow region B, float, and join the flow along the side wall 1g of the separation tank 1.

The liquid in the outflow region C passes from the outlet 13 through the outflow pipe 14 and is discharged through the outflow pipe 14. The liquid continuously flows into the separation tank 1 while the discharge continues, and separation and retention of the float by the flow of the upper layer and separation of the solids by the swirling flow of the lower layer are continued in the interior of the separation tank 1.

When the water level in the separation tank 1 rises, the liquid starts flowing through the overflow pipe 23 of the drain part 20 so that the water level lowers. As a result, a certain level height can be always maintained. In particular, the holding wall 24 is provided around the overflow pipe 23, and the liquid flows in through the gap 24a formed between the holding wall 24 and the bottom plate 20a, and thus no float is introduced. For this reason, even in the case where the floating height of the float increases as the water level in the separation tank 1 rises, the float does not flow out through the overflow pipe 23.

In the case where the float held in the holding member 10 and the float held in the discharge portion 20 are discharged from the separation tank 1, the inflow of the liquid from the inlet 6 into the inflow region B is stopped and the valve provided in the discharge pipe 21 is opened. Since the drainage pipe 21 is formed in the bottom plate 20a of the drainage part 20, the liquid and the floating objects in the portion surrounded by the side wall 20b and the end wall 20c of the drainage part 20 and the guide plate 22 are drained.

As described above, the level of the bottom plate 20a of the drain portion 20 is set to be substantially equal to the lower level of the inlet 6. For this reason, when the drain pipe 21 is opened in a state where the flow of liquid from the inlet 6 is stopped, all of the liquid and the floating objects in the separation tank 1 above a level at which the lower level of the inlet 6 and the bottom plate 20a of the drain portion 20 are connected to each other are drained. Further, after discharging all the liquid and the floating matter above the level connecting the lower level of the inlet 6 and the bottom plate 20a of the discharge portion 20 to each other, by opening the sediment discharge pipe 1d, all the sediment deposited on the sedimentation portion 1c and the liquid in the separation tank 1 can be discharged.

As described above, it is possible to hold the flotage containing oil and contained in the liquid flowing in from the inlet 6 in the holding member 10 and discharge the flotage through the discharge pipe 21, and discharge the solid to the outside of the separation tank 1 through the sediment discharge pipe 1 d. Therefore, the liquid flowing out of the separation tank 1 through the outlet 13 and the outflow pipe 14 does not contain floating materials and solids.

The separating apparatus according to the invention is not necessarily limited to the above-described embodiments and should include modified embodiments within the scope of the invention.

For example, in the present embodiment, the partition member 9 is disposed opposite to the inlet 6 so that a flow path having substantially the same width can be formed along the side wall 1g of the separation tank 1. However, the partition member 9 may be provided so as to be biased toward either one of the side walls 1 g. In this case, the flow along the side wall 1g may collide with the other side wall at a position corresponding to the restraining portion 10b of the holding member 10, and be introduced into the holding member 10 by providing the partitioning member 9 and the holding member 10 so as to be biased toward either one of the side walls 1 g.

Further, a rotation inducing portion (not shown) is formed in the holding member 10 so that it is possible to rotate the liquid introduced into the inside of the holding member 10 and collect the float at the center of the vortex. In particular, in the case where the discharge pipe is provided at a portion corresponding to the center of the vortex, the collected floaters may be discharged by using the discharge pipe.

Further, the lengths of the pair of restraining portions 10b constituting the holding member 10 need not be identical to each other, and the length of any one restraining portion 10b may be longer than the length of the other. In this case, the liquid flowing from the shorter suppression portion 10b may collide with the longer suppression portion 10b to be introduced into the interior of the holding member 10.

INDUSTRIAL APPLICABILITY

The separation device according to the invention allows separation of floating objects or solids from liquids, such as discharge liquids or discharge water from a plant. It is therefore advantageous to use the separating apparatus as a pre-treatment apparatus for a water treatment plant for separating floating materials and solids.

List of reference numerals

A separation device

B inflow region

C outflow region

1 separating tank

1a groove part

1c deposition part

1d sediment discharge pipe

1f, 1h, 3b, 20c end wall

1g, 3a, 20b side wall

2 separating member

3 upright part

3c upper end

3d, 4b sieve

3e rotation inducing member

3f guide part

4 transverse part

4a, 10c, 12a end portion

4c plate part

6 inlet

6a lower horizontal plane

6b upper horizontal plane

7 inflow pipe

9-segment member

9a collision part

9b maximum width part

9c parallel portion

10 holding member

10a base plate

10b inhibiting moiety

12 guide member

13 outlet

14 outflow pipe

20 discharge part

20a bottom plate

21 discharge pipe

22 guide plate

23 overflow pipe

24 holding wall

24a gap