JP5465638B2 - Sediment separation system and water separator for sand basin - Google Patents

Description

  The present invention relates to a sand settling system for separating sand from raw water stored in a sand settling basin.

  In the sand basin facility, the sand settled at the bottom of the sand basin is collected in a sand collection pit by a jet nozzle, etc., and the raw water containing the sand collected in the sand collection pit is collected by a sand pump using a jet pump or sand pump The sand is separated and removed from the pumped water by a sand settling machine. This sand settling machine is provided with a tank for storing the pumped-up water. However, if this tank can be miniaturized, it is possible to reduce the size of the sand settling machine.

  Here, utility model registration No. 3128554 discloses a so-called cyclone eddy current sludge separation and recovery device for separating sludge from polluted water. This vortex sludge separation and recovery device has a cylindrical circulatory separation tank main body, a circulatory part for circulating sewage water is provided in the middle part of the circulatory separation tank main body, and an inverted conical precipitator is installed in the lower part. In the upper part of the settling portion, a profit flow portion for overflowing and recovering fresh water is provided. And by flowing the polluted water into the circulating section and generating a spiral water flow, the sludge is separated from the polluted water by centrifugal force, and the fresh water is collected from the profit stream section, and installed at the bottom of the inverted conical precipitator Sludge is discharged from the drainage pipe.

  In the sedimentation basin facility, the cyclone as described above is arranged between the sedimentation basin and the sedimentation separator, and the cyclone collects the supernatant liquid from the sanded water and separates the supernatant liquid to concentrate it. It is possible to reduce the size of the tank by putting the sanding water into the tank of the sand settling machine and reducing the amount of the sanding water charged into the tank.

Utility Model Registration No. 3128554

  However, since cyclones require a large amount of power to obtain centrifugal force to separate sludge from polluted water, when a cyclone is installed between a settling basin and a sand settling machine, raw water containing sand is pumped and the cyclone is drawn up. For example, a large amount of power is required for a pumped sand water pump such as a jet pump or a sand pump.

  The present invention has been made to solve such a problem, and provides a sand settling system capable of separating sand from pumped water without requiring a large amount of power for the pumped sand water pump. The purpose is to do.

  A sand settling system according to the present invention includes a pumped-up water pump that pumps raw water containing sand from a settling basin, and a pumped-up water pumped by the pumped-up water pump into concentrated pumped-up water containing sand and a supernatant liquid. A water separator for separating water, and a solid-liquid separator for separating the concentrated pumped sand water separated by the water separator into a solid content containing sand and a separated water. A main body composed of a hollow truncated cone, an inlet provided on a side portion of the main body portion, into which the pumped water pumped by the sand pump is introduced into the main body portion along the tangent of the side portion, and the main body portion The supernatant liquid drainage part that is provided above the inlet of the main body and discharges the supernatant liquid overflowing from the main body part to the outside of the main body part, and the concentration pump that is provided below the inlet of the main body part and separated from the supernatant liquid And an outlet for discharging the sand water to the solid-liquid separator.

  According to the present invention, raw water containing sand is pumped from a sand basin to a water separator by a pump. The pumped sand water pumped up to the water separator flows into the main body part along the tangent of the side part from the inflow port provided on the side part of the main body part composed of the upright hollow truncated cone. In the part, a spiral water flow along the circular wall surface of the side part is favorably generated downward according to the shape of the hollow truncated cone. When the pumped sand water flows along the side wall surface, the sand contained in the pumped water collides with the wall surface and receives a downward force from the wall surface according to the shape of the hollow truncated cone. The sand that receives the downward force and follows the downward spiral water flow falls along the wall surface, and is drained from the drain port together with a part of the water to the solid-liquid separator. On the other hand, since the supernatant liquid from which the sand has been removed is lighter than the sand, it rises in the main body and is discharged from the supernatant liquid discharge section to the outside of the main body section. In this way, the sand contained in the pumped sand water receives a downward force from the wall of the water separator and is separated from the pumped sand water by falling in accordance with the downward spiral water flow. If not, the sand can be easily separated from the pumped water. Therefore, the sand can be separated from the pumped sand water without requiring a large power for the pumped sand water pump.

  Here, if the supernatant liquid discharge part is open to the atmosphere, atmospheric pressure acts on the liquid level in the water separator, so that the pressure loss generated in the water separator can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, sand can be isolate | separated from a sand pumping water, without requiring big motive power for a sand pump.

It is a schematic structure figure showing a sedimentation separation system concerning an embodiment of the present invention. It is a figure which shows the water divider which concerns on embodiment of this invention. It is sectional drawing which shows the conventional cyclone.

  Hereinafter, a preferred embodiment of a sand sedimentation separation system of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing a sedimentation separation system according to an embodiment of the present invention.

  The sedimentation separation system 100 according to this embodiment is applied to a sedimentation basin facility such as a sewage treatment plant, for example. The sand settling system 100 includes a sand settling basin 1. The sand settling basin 1 introduces raw water D containing settling substances (hereinafter simply referred to as sand) S such as sand. A sand collection pit 11 for collecting sand S is provided at the center of the pond bottom of the sand basin 1.

  In the sand basin 1, injection nozzles 2A to 2D are respectively provided in the vicinity of the bottom, and each of the injection nozzles 2A to 2D is connected to the high-pressure pump 4 via electric valves 3A to 3D, respectively. The high-pressure pump 4 is connected to a supply water tank 5, and supply water W is stored in the supply water tank 5. The high-pressure pump 4 is driven to pump the supply water W to each of the injection nozzles 2A to 2D and to inject high-pressure water from each of the injection nozzles 2A to 2D. Collect in pit 11.

  Above the sand collecting pit 11, a jet pump (pumped water pump) 6 is provided. This jet pump 6 has a suction part 61, an ejector part 62 and a sand raising pipe 63, and is connected to the high-pressure pump 4. When the supply water W is pumped by the high-pressure pump, the jet pump 6 injects high-pressure water into the sand pipe 63 by the ejector 62, and an ejector function (so-called jet pump function) generated by this high-pressure water injection. Thus, the sand S collected in the sand collection pit 11 is sucked and pumped from the suction portion 61 together with the raw water D in the vicinity of the sand collection pit 11.

  Above the settling basin 1, a settling sand separator (solid-liquid separator) 7 is provided. Above the settling sand separator 7, a water separator connected to the jet pump 6 and the settling sand separator 7. 8 is installed. FIG. 2 is a view showing the water diverter 8. FIG. 2 (a) is a plan view, FIG. 2 (b) is a view taken along the arrow IIb-IIb in FIG. 2 (a), and FIG. The IIc-IIc arrow directional view in (a) is shown, respectively.

  As shown in FIG. 2, the water separator 8 has a main body portion 81 formed of a formed hollow truncated cone. An inlet 82 is provided along the tangent to the side of the main body 81 at a side portion of the main body 81 and at a substantially central portion in the vertical direction. The inlet 82 is a sandpipe of the jet pump 6. 63 (see FIG. 1).

  The upper end portion of the main body portion 81 is opened to form an opening portion 83, and the upper portion of the main body portion 81 receives a supernatant liquid overflowing from the opening portion 83. ) 84 is provided. The overflow receiver 84 is open to the atmosphere at the top. The overflow receiver 84 is provided with a supernatant liquid drain port 85, and a pipe connected to the supernatant liquid drain port 85 extends to the sand basin 1 (see FIG. 1). In the vicinity of the side wall surface at the bottom of the main body 81, a lower discharge port 86 is provided for discharging concentrated sanded water from which the supernatant liquid has been separated to the sand settling separator 7.

  Returning to FIG. 1, the sand set separator 7 is provided with a main body tank 71 for storing concentrated pumped water discharged from the lower discharge port 86 of the water separator 8. The main body tank 71 is attached with a screw conveyor 72 that transports the sand S in the concentrated concentrated sanded water obliquely upward while draining it and separates it as a solid content. A discharge portion 73 for discharging the solid content is provided. The main body tank 71 is connected to a pipe for returning the separated water from which the sand S has been separated to the settling basin 1.

  In such a sand settling system 100, the raw water D containing sand S is pumped from the settling basin 1 to the water separator 8 by the jet pump 6, and the pumped sand water pumped up to the water separator 8 is an upright hollow gutter. It flows into the main body 81 along the tangent of the side from an inflow port 82 provided on the side of the main body 81 composed of a truncated cone.

  At this time, a spiral water flow along the circular wall surface of the side portion is favorably generated downward in the main body portion 81 according to the shape of the truncated truncated cone.

  When the pumped sand water flows along the side wall surface, the sand S contained in the pumped sand water collides with the wall surface and receives a downward force from the wall surface in accordance with the hollow truncated cone shape. Accordingly, the sand S that receives the downward force and follows the downward spiral water flow falls to the bottom along the wall surface, and a sand sediment separator 7 below with a part of the water from the lower drainage port 86 provided near the wall surface. Drained into

  On the other hand, since the supernatant liquid from which the sand S has been removed is lighter than the sand S, it rises in the main body 81, overflows from the opening 83 into the overflow receiver 84, and is discharged from the supernatant liquid outlet 85 to the outside of the main body 81. Return to the settling basin 1.

  Thus, in the water separator 8 according to the present embodiment, the sand S contained in the pumped water receives a downward force from the wall surface of the water separator 8 and falls according to the downward spiral water flow. Since it is separated from the pumped sand water, the sand S can be easily separated from the pumped sand water even if a large centrifugal force is not obtained. Therefore, the sand S can be separated from the pumped sand water without requiring large power for the jet pump 6.

  In addition, when the conventional cyclone 9 as shown in FIG. 3 is adopted, the sand pumping water flows into the main body 91 from the inlet 92 provided at the upper portion of the main body 91 along the tangent of the side, A spiral water flow is generated downward along the wall surface in 91. When the pumped sand water flows along the wall surface, the sand S contained in the pumped water collides with the wall surface, but since the middle part of the main body 91 has an inverted hollow truncated cone shape, the sand S is more than the wall surface. Receives upward force. Therefore, in the conventional cyclone 9, a downward force does not act on the sand S contained in the pumped sand water, and a large power is required for the pumped sand water pump.

  Moreover, in the water divider 8 which concerns on this embodiment, the distance from the inflow port 82 to the lower drainage port 86 can be set arbitrarily. On the other hand, in the conventional cyclone 9 shown in FIG. 3, the lower portion of the main body portion 91 needs to be narrowed at a predetermined angle with respect to the vertical direction to form a lower discharge port 93, thereby A distance to the outlet 93 is required, and the apparatus becomes large and the manufacturing cost increases. On the other hand, in the water divider 8 according to the present embodiment, the apparatus can be downsized and the manufacturing cost can be reduced as compared with the conventional cyclone 9.

  Further, in the water divider 8 according to the present embodiment, the overflow receiver 84 is open to the atmosphere, so that the atmospheric pressure acts on the liquid level in the water divider 8 and reduces the pressure loss generated in the water divider 8. it can.

  Moreover, in the water separator 8 which concerns on this embodiment, since the lower drainage port 86 is provided in the bottom part of the main-body part 81 and the wall surface vicinity, the sand S which falls along the wall surface in the main-body part 81 is favorable. It can be discharged outside the main body 81.

  As mentioned above, although the sedimentation separation system which concerns on embodiment of this invention was demonstrated, this invention is not limited to the said embodiment. For example, in the above embodiment, the overflow receiver 84 of the water separator 8 is open to the atmosphere, but may not be open to the atmosphere. Moreover, in the said embodiment, although the jet pump 6 is used as a pumping sand water pump, it may replace with the jet pump 6 and a sand pump may be used.

  DESCRIPTION OF SYMBOLS 1 ... Sand basin, 6 ... Jet pump (pumped water pump), 7 ... Sand sediment separator (solid-liquid separator), 8 ... Water separator, 81 ... Main part, 82 ... Inlet, 84 ... Overflow receiver (supernatant) (Liquid drainage part), 86 ... lower discharge port.

Claims (2)

A pumping water pump for pumping raw water containing sand from a sand basin;
A water separator for diverting the pumped sand water pumped by the pumped sand water pump into a concentrated pumped sand water containing the sand and a supernatant;
A solid-liquid separation device that separates the concentrated pumped water divided by the water separator into a solid containing the sand and separated water;
The water divider is
A main body composed of an upright hollow truncated cone,
An inlet that is provided at a side of the main body, and that allows the pumped sand pumped by the sand pump to flow into the main body along a tangent to the side,
A supernatant liquid drainage part provided above the inflow port of the main body part and discharging the supernatant liquid overflowing from the main body part to the outside of the main body part;
Wherein provided in the lower than the inlet of the main body, possess an outlet for discharging the concentrated Agesuna water the supernatant liquid is separated into the solid-liquid separator,
The supernatant liquid drainage part is open to the atmosphere ,
Sand settling system. A water separator that divides the pumped sand pumped by a pumped sand pump from a sand basin into concentrated pumped sand water containing a sand and a supernatant liquid,
The water divider is
A main body composed of an upright hollow truncated cone,
An inlet that is provided at a side of the main body, and that allows the pumped sand pumped by the sand pump to flow into the main body along a tangent to the side,
A supernatant drainage unit provided above the inflow port of the main body, and discharging the supernatant from the main body to the outside of the main body;
An outlet that is provided below the inflow port of the main body and discharges the concentrated deep-sand water from which the supernatant liquid has been separated;
The supernatant liquid drainage part is open to the atmosphere,
Water separator for sand basin equipment.

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