JPS61263689A - Septic tank - Google Patents

Abstract

PURPOSE:To prevent clogging due to bubbles deposited in the processing agent layer by carrying out its treatment only above the processing agent layer while repeating the filling and discharge of water with a level sensor. CONSTITUTION:Water to be treated is introduced from a water discharge pipe 5 at the upper part of a tank 1 of appropriate volume, passed through a layer 3 of a processing agent such as activated carbon provided in the tank and discharged from the bottom in the septic tank. A water level sensor 8 for detecting the high water level H and a water discharge level (h) almost at the same level as the effluent level is furnished. A drainage pipe 9 is led from the bottom of the tank to a level slightly lower than the high water level H and then to a position below the water surface of a waste water sump 10. The passage of water through the drainage pipe 9 is controlled by the water level sensor 8. Namely, a suction effect is provided, contact of the processing agent layer with air is prevented, permeability is improved to enhance the capacity and the volume of the tank can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a purification treatment tank used for purifying factory waste liquid and the like using carbonized charcoal, ion exchange resin, and the like.

For example, in a painting factory, the water used in the washing process after the surface treatment process with acid or alkali or the electrodeposition coating process is contaminated with organic matter that has adhered to the product and taken out in the previous process. Even if you use this cyclically,
When discharging wastewater, it is also necessary to purify it. The purification process uses a filtration method in which water passes through a layer of treatment agent such as ion exchange resin. However, in this case, the amount of water that permeates through the treatment agent layer is small, and a large-capacity treatment tank is required to treat the required amount, and the treatment agent layer gradually becomes clogged. This required large-scale equipment, such as setting up a large head. Furthermore, if the introduction of the water to be treated is stopped and air enters the treatment agent layer due to the lowering of the water level in the treatment tank, it will prevent water from permeating during the next treatment.
There were many troublesome problems such as accidents involving overflow of treated water and the need to be constantly monitored.

This invention aims to improve the above problems,
The present invention provides a purification treatment tank that not only provides a suction effect but also prevents the treatment agent layer from coming into contact with air through automatic monitoring, improves permeability, increases treatment capacity, and reduces the tank capacity. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings showing embodiments of the present invention will be explained below.

1 indicates a tank with a suitable capacity, and a treatment agent layer 3 is provided on a wire gauze placed at the bottom of the tank. The treatment agent layer 3 is made of ion exchange resin, activated carbon, or powder such as earth and sand depending on the purpose, and a filter may also be used. The upper surface of the treatment agent layer 3 is set lower than the upper surface of the tank l. DA is a pedestal of appropriate height.

There is a discharge pipe for the water to be treated at the top of the tank! is guided.

There is a dispersing device 6 at the lower end to disperse and supply the water into the tank l. A lower fresh water outlet opens below the wire mesh λ at the tank/bottom. Further, a water surface sensor g is installed above the tank l to detect a full water level H and a drainage level h which is approximately the same level as the upper surface of the treatment agent layer 3. As for the type of water surface sensor g, a float type, an energized type, and other known sensors are used. On the other hand, a drain pipe 9 is connected to the outlet 7. The drain pipe 9 once rises to near the full water level H, then reverses and descends, and the lower end opens below the water surface of the drain sump io. Further, an opening/closing pulp // is installed at the lower end of the drain pipe 9. The opening/closing pulp l/ is made of electromagnetic pulp or the like, and is controlled by the water surface sensor g to open at the full water level H and close at the drain level H.

With the above configuration, when the water to be treated that is constantly discharged from the discharge pipe S becomes full, the opening/closing pulp/l opens and drains the water. The waste water flows through the discharge pipe 9 in the form of a siphon, but since the length of the drain pipe 9 is long, once it begins to flow, the water inside the tank is sucked out by its surging effect, increasing the permeation pressure of the treatment agent layer 3. The tank/water level drops due to drainage, and when the water reaches the drainage level h, the opening/closing pulp l/ closes to stop drainage and the water level begins to rise. In this way, the full water level H and the drain level H
Water is stored and drained repeatedly between the layers, and the treatment agent layer 3 is not exposed to air, and air bubbles do not adhere to the layer and impair permeation performance.

In addition, 12 in the figure is the opening/closing pulp of the air introduction hole 13 provided at the upper end of the drain pipe 9 in place of the opening/closing pulp l/.
Close at , and open at drain level h. Drainage is controlled by intermittent siphon effect of the discharge pipe 9, and electromagnetic force can be miniaturized.

As described above, the septic tank of the present invention uses a water surface sensor to repeatedly perform the process of filling water and draining only above the treatment agent layer, thereby preventing clogging caused by air bubbles adhering to the treatment agent layer. In addition, the drainage surging effect in the drain pipe provides a suction effect and increases the permeation pressure, greatly improving treatment capacity and greatly reducing the volume of the treatment tank for the unit amount of water that needs to be treated. , has the effect of reducing equipment costs. It is also effective for use in purifying household drinking water.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a purification tank showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional side view thereof. /...Tank 3...Treatment agent layer S...Water pipe g.
...Water surface sensor 9...Discharge pipe /I...Opening/closing half-way 1 [! l

Claims (1)

[Claims] In systems where the water to be treated is introduced from the top of the tank with an appropriate volume, passes through the treatment agent layer installed in the tank, and is drawn out from the bottom of the tank, the full water level and the top of the treatment agent layer are at approximately the same level as the drainage level. In addition to providing a water surface sensor that detects water level, the drain pipe led out from the bottom of the tank is first guided slightly below the above-mentioned full water level, and then guided below the water surface of the drain sump, and the flow and stop of this drain pipe are controlled by the water surface sensor. A septic tank characterized in that it is controlled by.