JPH0657359B2 - Sewage purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention hangs a submersible pump in a tank, and the suction operation of the pump causes the supernatant sewage in the tank to pass through a drain pipe connected to the pump. The present invention relates to a structure for preventing a scum floating in a water surface of a septic tank that is discharged to a processing tank or the like from being sucked by a pump.

[Prior Art] A conventional example suitable for comparison with the present invention is, for example, Japanese Utility Model Publication No. 56-34596. This is configured such that a submersible pump and a discharge hose connected to the submersible pump are directly suspended in water.

[Problems to be Solved by the Invention] In the septic tank described in the prior art, since the pump hangs down directly in the water, scum floating on the water surface is sucked into the pump when the supernatant water is discharged. Is mixed with the supernatant water, and this mixed supernatant water is discharged into another tank.

Therefore, it is an object of the present invention to completely prevent suction of scum by a pump and also prevent suction of settling sludge so that only supernatant water can be collected and discharged.

[Means for Solving the Problems] The present invention for achieving the above-mentioned object is to hang a submersible pump in a tank body, and through a drain pipe that connects the supernatant wastewater in the tank body to the pump by the suction operation of the pump. In the sewage purification device that discharges the water to a post-treatment room, etc., the submersible pump and the drain pipe connected to the submersible pump are vertically installed in the tank body, and the upper end is projected above the maximum water level of the supernatant water and the lower end is below the minimum water level. Is inserted into and supported by a hollow cylindrical holder located at the bottom of the holder, and a supernatant sewage water passage hole is provided on the outer periphery of the lower portion of the holder. The baffle plate for preventing inclusion of sedimented sludge provided in the holder in the water passage hole. The gist is that the people are faced with each other.

[Example] 1 is a tank body that constitutes a sewage purification apparatus, and this tank body 1 is composed of a large number of processing chambers 2 that communicate with each other from the front end inlet portion toward the rear end outlet side, and A submersible pump 3 is inserted into the processing chamber 2, and the suction operation of the pump 3 causes the supernatant sewage in the processing chamber 2 to be discharged to the next processing chamber 2 (for example, the final disinfection chamber). 1 shows a general form of a sewage purification device.

Therefore, the gist of the present invention is that the submersible pump 3 and the drainage pipe 3a connected to the submersible pump 3 are vertically provided in the tank body 1, and the upper end is projected above the highest water level and the lower end is located below the lowest water level. The hollow cylindrical holder 6 is inserted and supported. Further, a large number of clear water passage holes 6a are provided on the outer periphery of the holder 6 facing the submersible pump position, and the settling sludge that is formed around the holder 6 around the water passage holes 6a and the suction port of the submersible pump 3 is prevented from being entrained. The baffle plate 6b of FIG.

In addition, the holder 6 has a support wall 5 horizontally extended to one side of the manhole 4 so as to correspond to the manhole 4, and the upper portion of the holder 6 is fixed to the support wall 5 such that the upper and lower positions can be adjusted. In this example, the support wall 5 is provided with a notch 5a, and the holder 6 is slidably inserted into the notch 5a so that the holder 6 is wider than the notch 5a. The collar plate 7a is inserted and fastened with a screw 7b, and the collar plate 7a is brought into contact with the upper surface of the support wall 5 like a stopper.

[Operation] By driving the submersible pump 3, for example, as shown in FIG.
Although the supernatant sewage in the range between W ・ L (highest water level) and L ・ W ・ L (lowest water level) is discharged, the scum floating on the water surface is always above the highest water level of the supernatant water. Since the hollow cylindrical holder 6 protruding to prevent the scum from entering the holder 6, the scum is not sucked by the pump 3 and only the supernatant water is discharged. On the other hand, when the supernatant water is discharged, a phenomenon occurs in which the settled sludge at the bottom of the tank is caught by the water passage hole 6a of the holder 6 due to the suction force of the pump. Entrainment of the settled sludge is prevented by 6b, so that only the supernatant water is collected and discharged.

Thus, in this embodiment, the drain pipe 3 connected to the submersible pump 3
In a, a pipe 8 for returning sludge to the front treatment chamber of the treatment chamber having the pump and a pipe 9 for discharging supernatant sewage to the rear treatment chamber of the treatment chamber having the pump are provided via a three-way switching valve 10. The pump 3 is made to communicate with each other, whereby the suction of the sludge accumulated on the baffle plate 6b and the suction of the supernatant sewage are performed by one pump 3 in a combined manner.

In addition, as the operation, first, the switching valve 10 is switched to the pipe 8 side for a short time, and the pump 3 is driven in this state so that all of the sludge component staying on the baffle plate 6b is removed. It is returned to the front treatment chamber for reprocessing through the pipe 9, and after that, the switching valve 10 is switched to the pipe 9 side at a proper time, so that the supernatant sewage is passed through the pipe 9 to the rear of the disinfection chamber. It is released into the processing chamber.

[Effects of the Invention] As described above, according to the present invention, the following effects can be obtained.

(a) The submersible pump suspended in the tank is hung in the tank, and the upper end is projected above the maximum water level of the clear water,
Since the lower end was inserted and supported in the hollow cylindrical holder positioned below the lowest water level, even if the water surface fluctuates between the highest and lowest water levels, the scum that is always floating on the water surface interferes with the holder, The suction of scum into the pump can be completely blocked.

(b) Since the baffle plate provided on the holder is surrounded by the water passage hole provided on the holder, it prevents the settling sludge from being entrained in the water passage hole, and prevents the entrainment and the scum. Only the supernatant water can be reliably collected and discharged by the suction-preventing action of.

(c) Since the drain pipe connected to the submersible pump is also inserted in the holder, the pump can be installed and converted easily by pulling up and down the drain pipe.

[Brief description of drawings]

FIG. 1 is a front view of the purifying device, FIG. 2 is a vertical cross-sectional view of a main portion of the same as above, FIG. 3 is a plan view of the same as above, and FIG. 4 is a partial vertical front view showing a fixing means of a pump holder. The figure is a front view of the baffle plate portion. 1 ... Tank, 2 ... Processing room, 3 ... Submersible pump, 6 ...
Hollow cylindrical holder, 7 ... Fixing means.

Claims (1)

[Claims] 1. A sewage purification apparatus in which a submersible pump is hung in a tank body, and the suction operation of the pump discharges supernatant sewage in the tank body to a post-treatment chamber or the like via a drain pipe connected to the pump. A pump and a drain pipe connected to this are hung vertically in the tank body, and the upper end is projected above the maximum water level of the clear water,
The lower end is inserted and supported by a hollow cylindrical holder positioned below the lowest water level, and a supernatant sewage water passage hole is provided on the outer periphery of the lower portion of the holder, and the settled sludge winding provided in the holder is provided in the water passage hole. A sewage purification device characterized in that it encloses a baffle plate for preventing entrapment.