JPS6227203Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a scum outflow prevention device in a batch settling tank.

(Prior art) and (problems to be solved by the invention) In a batch settling tank, when the settled sludge and supernatant water are sequentially drawn out after solid-liquid separation, the scum that has formed on the surface of the supernatant water is pulled out together with the supernatant water. There was a risk that the water would be drained and the quality of the treated water would deteriorate.

In conventional batch treatment using batch sedimentation tanks, scum outflow has rarely been a problem in terms of the amount of water to be treated or the size of the equipment, but scum outflow may occur depending on the properties of the water to be treated. The resulting increase in the concentration of suspended solids in the supernatant water may become a problem.

(Means for Solving the Problems) The present invention has been proposed in order to solve the above problems, and includes a sieve member equipped with a flotation device that floats on the liquid surface in the sedimentation tank, A lower stopper for supporting the sieve member disposed at the inner lower part and the floating of the sieve member on the lower stopper are locked, and the lock of the sieve member is released when the liquid level in the tank rises to a predetermined liquid level. This invention relates to a scum outflow prevention device in a batch type sedimentation tank, characterized by comprising a locking device for a sieve member configured to do so.

(Function) In the present invention, as described above, since the sieve member equipped with a flotation device floats on the liquid level in the settling tank, the sieve member follows fluctuations in the liquid level in the tank during solid-liquid separation. The scum moves and is supported on the lower stopper disposed at the lower part of the tank when the supernatant water is drawn out, and is locked on the stopper by the locking device, so that the scum is retained on the sieve member. This prevents contamination into the supernatant water.

When newly treated water flows into the settling tank, when the liquid level of the treated water reaches a predetermined height,
The locking of the sieve member by the locking device is released, and the sieve member rises and floats on the liquid level in the tank.

(Effects of the invention) According to the invention, as described above, by disposing a sieve member that floats on the liquid surface in the sedimentation tank, it is possible to prevent scum from entering the supernatant water and improve the water quality of the treated water. Deterioration can be prevented.

Furthermore, when newly treated water flows in, the sieve member is locked on the lower stopper disposed at the lower part of the tank via the locking device until the liquid level in the tank reaches a predetermined height, and then the sieve member is Since the lock on the sieve member is released and the sieve member is allowed to float on the liquid surface, the sieve member is washed while the sieve member is submerged in the water.

By appropriately selecting the opening of the sieve member, it is possible to prevent not only scum but also water scale floating on the liquid surface from flowing out.

(Example) The present invention will be described below with reference to the illustrated embodiments.

1 is a sedimentation tank, 2 is a sieve member that floats on the liquid surface in the tank 1, and is equipped with a floating bladder 3 as a flotation device. A lower stopper 4 for the sieve member 2 is disposed at the bottom of the settling tank 1, and a triangular upper stopper rotatably pivoted to a support rod 5 protruding from the settling tank 1 is disposed above the settling tank 1. 6 is installed oppositely, and the same stopper 6
A cable 7 tethered to is connected to an upper float 9 via a pulley 8. Note that each of the members 5, 6,
7, 8, and 9 constitute a locking device for the sieve member 2.

Since the illustrated embodiment is constructed as described above, when the settled sludge A and supernatant water B are drawn out after solid-liquid separation in the settling tank 1, the sieve member 2 moves as the water level in the tank decreases. From the state shown in FIG. 2, the scum C descends following the water surface to the state shown in FIG. 2 and keep it on top of the supernatant water A.
Prevent contamination inside.

Next, when new treated water D flows into the settling tank 1, the upper stopper 6 prevents the sieve member 2 from rising (see Fig. 3). When the water level reaches a predetermined height in the tank as shown in FIG. When released, the sieve member 2 rises in the treated water D and floats on the water surface, resulting in the state shown in FIG.

According to the embodiment described above, the sieve member 2 prevents scum C from entering the supernatant water B, and the sieve member 2 is submerged in the treated water D as shown in FIG. During the process, the sieve member 2 is cleaned.

[Brief explanation of the drawing]

1 to 4 are longitudinal cross-sectional views showing the operating state of an embodiment of the scum outflow prevention device in a batch type sedimentation tank according to the present invention; FIG. 1 shows the state during solid-liquid separation; The figure shows the state when the settled sludge and supernatant water are drawn out, and FIGS. 3 and 4 show the state when new treated water flows in. 1... Sedimentation tank, 2... Sieve member, 3... Swim bladder, 4
... lower stopper, 5 ... support rod, 6 ... upper stopper, 7 ... cable, 8 ... pulley, 9 ... upper float.

Claims (1)

[Scope of utility model registration request] A sieve member equipped with a flotation device that floats on the liquid surface in the settling tank, a lower stopper for supporting the sieve member disposed at the lower part of the tank, and a lower stopper for supporting the sieve member on the lower stopper, locking the floating of the sieve member in the tank. 1. A scum outflow prevention device in a batch type sedimentation tank, comprising a sieve member locking device configured to release the sieve member lock when the liquid level rises to a predetermined liquid level.