JPS6331754Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sludge capacity meter in a sewage treatment equipment that processes sewage and the like using an activated sludge method.

Figure 1 shows a conventional sludge capacity meter (abbreviated as SV meter).
This figure shows the structure of the connection between the lower end of the settling pipe and the drain tank. In the figure, 1 is a glass tube, etc.
This is a sedimentation tube made of a light-transmitting material, and is used to measure the sedimentation characteristics of sample water. 2 is a flange, 3 is a base plate, 4 is a drain valve, and 5 is a drain tank, and the drain tank 5 is connected to the lower end of the settling pipe 1 via the base plate 3 and the flange 2. Further, a valve seat of a drain valve 4 is formed on the base plate 3, and the central opening of the flange 2 and the valve port are connected.

6 is a sealing member for the rod portion of the drain valve 4;
7 and 8 are a light source and a light receiver, which constitute a photoelectric detection mechanism for SV detection.
This photoelectric detection mechanism is arranged so as to be movable up and down along the sedimentation tube 1.

The SV meter with the above configuration puts sample water into the sedimentation tube 1,
The light source 7 and receiver 8 of the photoelectric detection mechanism are lowered to measure the SV value of the sample water.The light source 7 and receiver 8, which follow the drop of the sludge interface, are lowered at a position dimensional from the top surface of the drain valve 4. is regulated. This is determined from ₁ + ₂ + ₃ shown in FIG.
That is, ₁ is the thickness of the flange 2, ₂ is the gap that prevents the light source 7 and receiver 8 from coming into contact with the flange 2 when lowered, and ₃ is the axis of the settling tube of the light source 7 and receiver 8. It is the length in the direction.
Therefore, measurements cannot be made below this value, and measurements cannot be made below the SV value corresponding to the range of dimensions.
Although there is almost no problem in ordinary sewage treatment plants, this is due to low load and low MLSS (activated sludge suspended solids concentration).
MLSS is low at the time of treatment or when a new treatment plant starts operation, and the SV ₃₀ value (30 after the start of sedimentation) is low.
There is a problem when the SV value (SV value) is less than 10%.

There are also SV meters that can measure down to 0%, but they have a small sample capacity and cannot obtain true sedimentation characteristics, or they use pinch valves, solenoid valves, etc. for the drain valve, and their structure is There are drawbacks such as creating a dead space on the top and clogging.

The present invention was made to solve the above-mentioned problems.The flange also plays the role of a base plate, and a thick part that protrudes toward the settling pipe is formed in the center of the flange. The purpose of the present invention is to provide an SV meter that can measure SV values down to approximately 0% by forming the valve seat of the drain valve.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 2 shows an embodiment of the present invention, in which 1 is a settling tube, 4 is a drain valve, 5 is a drain tank, 6 is a sealing member, 7 is a light source, and 8 is a light receiver. Reference numeral 9 denotes a flange, which also plays the role of the base plate 3 in FIG. This flange 9 integrates the sedimentation pipe 1 and the drain tank 5, and also integrates the drain valve 4.
It forms a cylinder with a sealed bottom.
That is, the flange 9 has a thick part 9A in its center that has approximately the same diameter (slightly smaller diameter) as the inner diameter of the settling pipe 1 and projects toward the pipe 1, and the valve seat of the drain valve 4 is formed in this part 9A. ing.

Note that the thick portion 9A of the flange 9 may be formed to be separated at the position shown by the dotted line, and the two may be connected with bolts or the like.

The SV meter according to the present invention having the above-mentioned configuration integrates the sedimentation pipe 1 and the drain tank 5 with a flange 9, and has a thick portion 9 protruding toward the pipe 1 at the center.
A is formed at the bottom of the sedimentation tube 1, and the valve seat of the drain valve 4 is formed at this portion, so that only the bottom level of the lower end of the sedimentation tube 1 rises to near the lower limit of the light source 7 and the light receiver 8, and it is possible to measure the SV value down to almost zero percent without the unmeasurable area as in the conventional method (Figure 1). Moreover, the drain section has a structure in which the entire bottom falls out, almost the same as in the conventional method, and there is no trouble such as clogging.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a connection between a settling pipe and a drain tank of a conventional SV meter, and FIG. 2 is a sectional view showing an embodiment of the SV meter according to the present invention. 1... Sedimentation pipe, 4... Drain valve, 5... Drain tank, 6... Seal member, 7... Light source, 8...
Receiver, 9...Flange, 9A...Thick walled part.

Claims (1)

[Scope of utility model registration request] In a sludge capacity meter in which a drain tank is connected to the lower end of a sedimentation tube into which test water is placed, and a photoelectric detection mechanism having a light source and a light receiver is movable up and down along the sedimentation tube. are integrated through a flange, and at the center of this flange, a thick part with approximately the same diameter as the inner diameter of the sedimentation tube and protruding upwards inside the tube is placed at the bottom level of the lower end of the sedimentation tube as a light source and light receiver. A sludge capacity meter characterized in that it is formed so as to rise to the lower eye point of the sludge, and a valve seat for a drain valve is formed in this part.