JPH0248079Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a scum removal device that can automatically and efficiently remove scum floating on the water surface of a batch-type sewage treatment tank.

[Conventional technology]

Conventionally, in batch-type sewage treatment tanks that repeat aeration, sedimentation, and discharge, the water level in the tank fluctuates significantly, requiring the use of a scum discharge device with an extremely complex configuration. Even with this system, there were problems such as the inability to automatically and efficiently discharge floating scum on the water surface at the beginning of the sedimentation process in the batch wastewater treatment process. This idea was devised to solve the above problems, and is aimed at sewage treatment tanks that carry out batch-type sewage treatment under conditions where the water level in the tank fluctuates. By injection,
It is an object of the present invention to provide a scum removal device capable of automatically and efficiently discharging floating scum on the water surface in a tank.

[Means to solve the problem]

The scum removal device according to this invention is installed above the water surface of one side wall of a batch-type sewage treatment tank, sucks liquid in the tank and sprays it onto the water surface, and removes floating scum on the water surface from the batch-type sewage treatment tank. A water spray device for removing scum that sprays water onto the other side wall of the treatment tank, and a water sprinkler installed on the other side wall and located below the highest water level in the tank,
a scum discharge weir for introducing the floating scum; a level detection means for detecting the highest water level in the tank; and when the level detection means detects the highest water level in the tank, the detection signal is inputted to At the beginning of the process, the control section opens the electromagnetic valve of the discharge system of the scum discharge weir or operates the scum discharge pump, and at the same time moves the water sprinkler.

[Effect]

In the scum removal device of this invention, the level detection means detects the highest water level in the tank at the beginning of the sedimentation process of the batch type sewage treatment tank, and the control unit inputs the detection signal to the control unit, which controls the scum discharge. When the solenoid valve of the weir discharge system is opened or the scum discharge pump is operated, the water sprinkler is operated at the same time. At this time, the water spray device sucks in the liquid in the tank and sprays it onto the water surface, and the sprayed water blows the floating scum on the water surface toward the scum discharge weir, causing it to flow away from the scum discharge weir. The floating scum is smoothly and reliably discharged. Therefore, with this invention, there is no need for a separate water supply source exclusively for the sprinkler system or a separate water supply device for the batch-type sewage treatment tank, and the liquid in the tank of the batch-type sewage treatment tank is
By simply circulating and spraying when the highest water level in the tank is detected, floating scum on the water surface can be automatically and smoothly discharged from the scum discharge weir as described above.

【Example】

An embodiment of this invention will be described below with reference to the drawings. Batch type sewage treatment tank 1 shown in Figures 1 and 2
performs sewage treatment under conditions where the water level in the tank fluctuates by repeating the steps of aeration, sedimentation, and discharge of inflowing sewage. This treatment tank 1 includes a water sprinkler 2 provided on one side wall 1a and located above the water surface, and a scum discharge weir 3 provided on the other side wall 1b opposite to the one side wall 1a. The water sprinkling by the water sprinkling device 2 and the discharge of scum from the scum discharge weir 3 related to the water sprinkling are automatically controlled by the control unit 4 at the initial stage of the sedimentation process in the treatment tank 1. , their related configurations are described below. First, as shown in FIGS. 1 to 3, the watering device 2 includes a pump 5 that is disposed above the water surface along substantially the entire length of one side wall 1a of the treatment tank 1, and is controlled and driven by a control section 4. Due to the operation of the tank, the liquid in the treatment tank 1 (usually treated water discharged from the treatment tank 1)
It consists of an injection water pipe 7 that sucks in and injects water. As shown in FIG. 3, this injection water pipe 7 has a fan-shaped spray (injection nozzle) 8 directed onto the water surface in the three directions of the scum discharge weir, and directs the liquid in the suction tank onto the water surface. It is designed to spray evenly and over a wide range. Incidentally, the reference numeral 9 in FIG. 2 is a buttful which partitions a small chamber into the inflow portion of the processing tank 1 and is open at the bottom. FIG. 4 and FIG. 5 show other embodiments of the water sprinkler device 2 described above. The water sprinkling device 2 of this embodiment includes a bent guide plate 10 fixed above the water surface along substantially the entire length of the one side wall 1a, and a guide plate 10 disposed opposite to the guide plate 10 to guide the liquid in the tank. It consists of a jetting water pipe 7 that jets in the direction of the plate 10, so that the purified liquid can be jetted over a wide range. In this case, the water jetted from the water jet pipe 7 does not need to be spread out so widely, and may simply have a large number of holes. In the above, the weir level of the scum discharge weir 3 is located below the highest water level (HWL) in the tank by Δh (several tens of millimeters), as shown in FIG. A solenoid valve 11 that is controlled to open and close by the control section 4 is provided in the discharge system of the scum discharge weir 3, and the discharge system is connected to the next process such as a sludge storage tank or a sludge thickening tank. ing. The scum discharge weir 3 may have a pump pit configuration, and the scum discharge may be controlled by turning on and off a scum discharge pump provided here. On the other hand, the control section 4 controls the pump 5 that sucks the liquid in the treatment tank 1 and sends it under pressure to the sprinkler device 2, and the solenoid valve 11 (or the scum discharge pump). Water level (HWL)
A level switch 12 is provided as a level detection means for detecting the level, and by inputting a signal when the level switch 12 detects the highest water level (HWL) in the tank, ), at the same time as opening the electromagnetic valve 11 or operating the scum discharge pump,
The pump 5 of the liquid injection system is operated. Therefore, when the pump 5 is in operation, it sucks in the liquid in the treatment tank 1 and pumps it to the water spraying device 2, so that the watering device 2 sprays the liquid in the tank onto the water surface. Therefore, due to the jet water, the floating scum on the water surface is removed from the scum discharge weir 3.
As a result, the floating scum is smoothly and reliably discharged from the scum discharge girder 3. Although this operation depends on the amount of water injected per unit time and the degree of scum removal effect, it is desirable to complete this operation in as short a time as possible (for example, several minutes) at the beginning of the precipitation process. In addition, in the above embodiment, the batch type sewage treatment tank 1
may be either a double-tank type or a single-tank type,
In the case of a double-tank type, other tank liquids are introduced, and in the case of a single-tank type, the inflow time is set once a day at the highest water level (HW) in the tank.
It is recommended to provide a means for forcing the water level in the tank to reach the highest water level (HWL) in the tank, such as by forcing the water level to reach the maximum tank water level (HWL). Furthermore, in batch wastewater treatment, wastewater is not normally introduced during the sedimentation/discharge process, but wastewater may be introduced during the sedimentation/discharge process.

[Effect of the idea]

As described above, according to this invention, in the early stage of the sedimentation process of a batch type sewage treatment tank, the level detection means detects the highest water level in the tank, and the control unit inputting the detection signal controls the discharge system of the scum discharge weir. By opening the solenoid valve in the channel or operating the scum discharge pump and simultaneously operating the sprinkler device, the sprinkler device sucks in the liquid in the tank and sprays it onto the water surface. Therefore, floating scum on the water surface can be smoothly and reliably discharged from the scum discharge weir. Therefore, with this invention, there is no need for a separate water supply source exclusively for the sprinkler system or a separate water supply device for the batch-type sewage treatment tank, and the liquid in the tank of the batch-type sewage treatment tank is
By simply circulating and spraying when the highest water level in the tank is detected, floating scum on the water surface can be automatically and smoothly discharged from the scum discharge weir as described above.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical cross-sectional view of a scum removal device according to an embodiment of the invention, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view of the main parts of the watering device, and Fig. 4 is a diagram showing other parts of the watering device. FIG. 5 is a schematic side view of FIG. 4. 1... Batch type sewage treatment tank, 1a... One side wall, 1
b...Other side wall, 2...Water spray device, 3...Scum discharge weir, 4...Control unit, 11...Solenoid valve, 12...
...Level switch (level detection means).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A batch-type sewage treatment tank that repeatedly aerates, settles, and discharges inflowing sewage to perform sewage treatment under conditions where the water level in the tank fluctuates; A water sprinkler for removing scum, which is installed on the water surface of one side wall, sucks in the liquid in the tank and sprays it onto the water surface, and sprays the floating scum on the water surface onto the other side wall of the batch-type sewage treatment tank. and a scum discharge weir provided on the other side wall and located near and below the highest water level in the tank to introduce the floating scum, a level detection means for detecting the highest water level in the tank, and this level detection means is located below the highest water level in the tank. When the highest water level in the tank is detected, the detection signal is input, and the solenoid valve of the discharge system of the scum discharge weir is opened or the scum discharge pump is operated and the water sprinkling is started at the beginning of the precipitation process. A scum removal device comprising a control unit for operating the device. (2) The above-mentioned water sprinkling device has a water injection pipe arranged along the water surface of one side wall of the batch-type sewage treatment tank, and is arranged facing the water injection pipe along the water injection pipe, and is configured to clear the water sprayed from the water injection pipe. The scum removing device according to claim 1, characterized in that the scum removing device comprises a guide plate that reflects uniformly.