JP4999672B2 - Wastewater septic tank - Google Patents

Description

  The present invention relates to a sewage septic tank for treating domestic wastewater.

  The sewage septic tank treats domestic wastewater and discharges it outside the system, and small household ones are often buried in the ground and used.

Various methods are used for the treatment of domestic wastewater. Generally, after anaerobic treatment, aerobic treatment is performed, and after disinfection with chlorine or the like, it is discharged.
The part to be disinfected is called a disinfection tank, and after finishing anaerobic and aerobic biological treatment, the precipitate is separated using the treated water tank, and the supernatant liquid is passed over the overflow weir and is often disinfected. (See Patent Document 1).

  Moreover, as shown in Patent Document 2, there is a type in which an advection pipe suspended downward from the liquid level of the treated water tank is provided, and disinfection is performed after passing through the advection pipe.

What is shown in the said patent document 1 or 2 is designed in consideration of suppressing the outflow of a scum as much as possible by using an overflow weir or an advection pipe.
ACT 4-114495 JP-A-11-138186

However, although the thing described in patent document 1 can suppress the outflow of a scum somewhat by providing an overflow dam, when there is much flow volume at the time of an inflow peak, there exists a possibility that a scum may flow out. .
In addition, since the adjustment of the level of the overflow weir must be performed each time when the septic tank is installed and maintained, this work is troublesome.

  What is described in Patent Document 2 does not depend on the level, and does not require an overflow weir, and can prevent scum outflow generated on the liquid surface of the treated water tank. No effect can be expected against the outflow of suspended SS (floating matter).

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a sewage purification tank capable of preventing scum, sludge and the like from flowing into the disinfection tank.

The present invention relates to the following.
(1) A treatment water tank and a rectangular parallelepiped disinfection tank installed in the treatment water tank, provided with an inlet to the disinfection tank having the same width in the height direction provided on three side surfaces of the disinfection tank, The inlet from the treatment water tank to the disinfection tank is in the disinfection tank horizontal section projection area, and has a baffle that enters from the side of the disinfection tank into the disinfection tank horizontal section projection area, and the baffle is below the liquid level of the treatment water tank. Sewage septic tank placed in the .
(2) Oite to claim (1), baffles, septic tank comprising a flat plate.
(3) In the item (1) or (2) , the sewage septic tank in which the inlet to the sterilization tank has an upward inclined water passage toward the inside of the sterilization tank.

According to the present invention, a treatment water tank and a disinfection tank disposed in the treatment water tank are provided, and the inlet from the treatment water tank to the disinfection tank is in the horizontal dissection area of the disinfection tank, and is disinfected from the side of the disinfection tank. By having a baffle that enters the tank horizontal section projection region, SS such as scum and sludge can be prevented from flowing into the disinfection tank, and stable treated water quality can be obtained.
When the baffle is disposed below the liquid level in the treatment water tank, the floating scum does not flow into the disinfection tank due to the baffle.
If the baffle is a flat plate, you can play the scum that is going to rise.
When the sterilization tank is a rectangular parallelepiped, it is easy to process because there are many flat plate members, and a large contact area with other members can be easily installed.
When the inlet to the sterilization tank is provided on the three side surfaces of the sterilization tank, the advancing speed of the treated water can be suppressed by increasing the area of the inlet from the treated water tank to the sterilization tank.
When the inlets to the disinfection tank have the same width in the height direction, the advection speed of the treated water can be made equal.
When the inlet to the sterilization tank has an upwardly inclined water passage toward the inside of the sterilization tank, scum, sludge and the like can be settled along the inclination.

The treated water tank described in the present invention is a tank disposed between a tank for performing anaerobic treatment and / or an aerobic treatment and a tank for performing disinfection (as a treatment step), and has a precipitation separation function. It is what.
The position where the treatment water tank is arranged is not particularly limited and can be arbitrarily determined. However, by arranging the treatment water tank adjacent to the tank for performing the immediately preceding treatment, such as an aerobic treatment tank, the entire wastewater treatment apparatus can be reduced in size Can be

The disinfecting tank described in the present invention is not limited as long as it can disinfect the treated water that has passed through the treating water tank described above, and a chlorine agent or the like can be used as the disinfecting agent.
The disinfection tank is arranged in the treatment water tank, and has an inlet for flowing treated water from the treatment water tank and an outlet for discharging treated water after disinfection, and the other part is separated from the treatment tank by a wall surface. Partitioned.
The shape of the disinfecting tank is not particularly limited, but considering that it is installed in the treated water tank, at least the side surface is preferably formed of a flat plate, and a rectangular parallelepiped shape that is easy to process is particularly preferable. With such a disinfection tank, when the disinfection tank is incorporated into the main treatment water tank, the contact area with the inner wall of the treatment water tank can be increased, and strong adhesion and fixation can be achieved.

As shown in FIG. 1, the disinfection tank horizontal section projection area described in the present invention refers to an area obtained by projecting an area obtained by cutting the disinfection tank 10 in an arbitrary horizontal section with respect to its outer portion.
In the example of FIG. 2, the cross section A is included in the cross section B, and the projection area of the area cut by the horizontal cross section of the cross section B is the disinfection tank horizontal cross section projection area. FIG. 3 illustrates an arbitrary cross-sectional area shape of the sterilization tank in order to explain the projection area, and the sterilization tank horizontal cross-section projection area matches any cross-section C, cross-section D, and cross-section E by projection. This is indicated by a region F surrounded by the outermost contour, that is, the outermost contour. Therefore, the baffle of this invention should just be inside the disinfection tank horizontal cross-section projection area | region F in FIG. As shown here, the horizontal sectional projection area of the disinfection tank refers to the maximum area obtained when projected continuously along the outline of an arbitrary sectional area.
The inlet to the disinfection tank is not limited in shape, size, number, etc., but by increasing the inlet area, the advection speed of the treated water can be suppressed, and the SS settles. Can be promoted.
In addition, when a plurality of inlets to the disinfection tank are provided, it is possible to equalize the inflow speed of the treated water tank at the inlet and promote SS sedimentation by equalizing the width in the height direction of the inlet. it can.
At the inlet of the sterilization tank, an upwardly inclined water passage toward the inside of the sterilization tank can be provided. When such a water passage is provided, this inclined surface brings about a hopper effect, and even if SS or the like passes through a baffle described later, it is possible to sink along the inclination.

The baffle described in the present invention means a scum baffle and prevents the scum in the treated water tank from flowing into the disinfection tank.
The baffle is arranged at one end on the side of the disinfection tank and on the other side in the disinfection tank horizontal section projection area described above.
The baffle having any shape may be used, but a flat plate shape is preferable because it does not get caught and plays scum and the like well.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a disinfection tank used in the present invention.
The disinfection tank 10 has a substantially rectangular parallelepiped shape, and an inlet 26 to the disinfection tank 10 having the same width in the height direction is provided on three adjacent side surfaces. The baffle 13 is installed in the inflow port 26 so as to go into the disinfection tank horizontal section projection region 14.

4 shows a cross-sectional view of the disinfection tank 10 shown in FIG. 1, and FIG. 5 shows a plan view of the disinfection tank 10 shown in FIG.
The flow of water in the sterilization tank 10 is sterilized through the sterilization basket 16 and the sterilization cylinder 11 after the treated water is transferred along the upwardly inclined water passage 27, passes through the baffle 13, and is discharged from the outlet 3. It is discharged outside.
Although the scum generated in the treatment water tank 9 rises linearly upward from the bottom of the treatment water tank 9 due to the generated gas, in the present invention, the inlet 26 to the disinfection tank 10 is provided in the disinfection tank horizontal section projection region 14. Since it is in (refer to FIG. 1), it is difficult to enter the disinfection tank 10, and even if it tries to enter temporarily, it is repelled by the baffle 13.
Moreover, although SS etc. are easy to advect along the flow of treated water, if the upward inclined water flow path 27 is provided, it can also be settled to the treated water tank 9 by the hopper effect.
The height H1 from the liquid level 15 to the lower end of the baffle 13 in the treatment water tank needs to have a length (dimension) that prevents the scum from passing through the baffle 13 when scum is generated on the liquid level. The amount of scum generated varies depending on the load of inflow water, and the amount of scum that can be stored in the treated water tank 9 can be obtained from the relationship between the cross-sectional area of the liquid surface 15 of the treated water tank and the height of H1. Therefore, it is important to design the height of H1 in consideration of these.

FIG. 6 is a schematic sectional view showing a sewage septic tank according to one embodiment of the present invention, and FIG. 7 is a plan view of the sewage septic tank shown in FIG.
In this embodiment, an anaerobic process and an aerobic process are performed, and after these processes are performed, disinfection and discharge are performed.
The sewage septic tank 1 is provided with an inflow port 2 through which the inflowing water 4 flows, and the inflowing water 4 flowing in from here is first subjected to anaerobic treatment. The anaerobic treatment is performed in the anaerobic filter bed first chamber 6 and the anaerobic filter bed second chamber 7.
The first chamber 6 in the anaerobic filter bed tank is provided with a filter bed filled with a mesh-like cylindrical filter medium 18, and filter medium outflow prevention members 21 are arranged above and below the filter bed so that the filter medium does not flow out. The anaerobic filter bed second chamber 7 is provided with a filter bed filled with a loofah-like plate-shaped filter medium 19, and the advection from the anaerobic filter bed first chamber 6 to the anaerobic filter bed second chamber 7 is: This is done by passing through the advection section 17.
In the present embodiment, both the anaerobic filter bed first chamber 6 and the anaerobic filter bed second chamber 7 are processed in descending flow, but the present invention is not limited to this.

The treated water that has been subjected to the anaerobic treatment passes through the advection section 22 and advancing to the carrier flow tank 8.
The carrier fluidized tank 8 has a carrier fluidized bed in which a hollow cylindrical carrier 20 is confined inside a carrier outflow prevention member 23 that prevents the carrier from flowing out vertically. Aerobic processing is performed by sending air from the device 24.
Part of the aerobic treated water is transferred to the anaerobic filter bed tank first chamber 6 by the air lift pump 25, and the other is transferred to the treated water tank 9.

  The flow of the treated water after being transferred to the treated water tank 9 is as described above with reference to FIGS. 1, 4 and 5, and after being disinfected, it is discharged from the outlet 3 to the outside of the system.

The perspective view of the disinfection tank which is an Example of this invention is shown. The perspective view of the disinfection layer which is another Example of this invention is shown. It is a schematic diagram explaining the disinfection tank horizontal section projection area | region described in this invention. It is sectional drawing of the disinfection tank shown in FIG. It is a top view of the disinfection tank shown in FIG. The schematic sectional drawing of the sewage septic tank which is an Example of this invention is shown. It is a top view of the sewage septic tank shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Waste water purification tank, 2 ... Inlet, 3 ... Outlet, 4 ... Inflow water, 5 ... Treated water, 6 ... Anaerobic filter bed 1st chamber, 7 ... Anaerobic filter bed 2nd chamber, 8 ... Carrier fluid tank , 9 ... treated water tank, 10 ... disinfecting tank, 11 ... disinfecting cylinder, 12 ... disinfectant, 13 ... baffle, 14 ... disinfecting tank horizontal section projection area, 15 ... liquid level of treated water tank, 16 ... disinfecting tank, 17 ... advection , 18 ... mesh-like cylindrical filter medium, 19 ... loofah-like plate-like filter medium, 20 ... hollow cylindrical carrier, 21 ... filter medium outflow prevention member, 22 ... advection section, 23 ... carrier outflow prevention member, 24 ... diffuser, 25 ... Air lift pump, 26 ... Inlet, 27 ... Inclined water passage.

Claims (3)

A treated water tank and a rectangular parallelepiped sterilization tank installed in the treated water tank, and provided with inlets to the sterilized tank having the same width in the height direction provided on three side surfaces of the disinfected water tank; From the side of the disinfection tank to the disinfection tank horizontal section projection area, and has a baffle that enters the disinfection tank horizontal section projection area from the side of the disinfection tank, and the baffle is disposed below the liquid level of the treatment water tank. septic tank that. Oite to claim 1, baffle, septic tank comprising a flat plate. 3. The sewage septic tank according to claim 1, wherein the inlet to the sterilization tank has an upwardly inclined water passage toward the inside of the sterilization tank.

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