JP2689468B2 - Scum treatment equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a scum treatment facility used in a sand basin in a sewage treatment facility.

[Prior Art] Scum generated in a sand basin in a sewage treatment facility is caused by sludge settled in the sand basin and fats and solids contained in sewage (water to be treated) aggregated and floated on the water surface. , Need to be removed.

In removing the scum, conventionally, an operator who monitors the occurrence status of the scum sprays high-pressure water from the floor of a sand basin to the surface of the water to be treated using a hose, or creates an air diffuser in the water to be treated. The scum is crushed and dropped into the pump well attached to the sand basin by the flow action of the air ejected from the nozzle of this air diffuser.

Sludge that has settled in the settling basin due to the flow action of the sewage is also dropped into this pump well, and these scum and sludge are sent by the pump to the first settling basin next to the settling basin, where they are subjected to settling treatment.

[Problems to be Solved by the Invention] In removing the scum as described above, in the former case, a worker or a long time work is required, and
It is difficult to completely crush the scum, so the treatment efficiency is poor, and the floor of the sand basin is generally high, which poses a danger to workers.

In the latter case, sludge and other impurities that settle in the sand basin may enter the nozzle of the air diffusing pipe and hinder the jetting of air, and the maintenance for removing these sludge and the like may be great. It was laborious and dangerous.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and is provided above the water to be treated and sprays high-pressure water to crush scum on the water surface to be treated. And a water sprinkler that flows in the direction of the pump well, and is installed below the surface of the water to be treated,
A stirrer that stirs the sludge settling in the sand basin and causes it to flow in the direction of the pump well, and detects the specified water level of the water to be treated in the sand basin and activates the sprinkler and the agitator when this specified water level is detected. And a level switch for emitting a signal.

[Operation] When the water to be treated reaches the prescribed water level in the sand basin, the level switch detects it and sends an operation signal to the sprinkler and the agitator.

As a result, the scum on the surface of the water to be treated is crushed by the high-pressure water in the form of spray sprayed by the sprinkler and sent to the well. Also, the sludge settling in the sand basin flows while being stirred by the stirrer and sent to the pump well, and the scum is made to flow by the flow of this sludge,
And it is crushed.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is an overall system diagram of the scum treatment facility according to the present invention, and FIG. 2 shows a sand basin equipped with this facility.

In FIG. 1, T indicates the sand basin, T ₁ indicates a pump well attached to the sand basin T, and sewage (water to be treated) is supplied from an inlet 1 on the right side of the figure and an outlet 2 on the left side of the figure. It is supposed to flow out from. The inflow port 1 and the outflow port 2 are respectively provided with gates 1a and 2a for opening and closing them.

A water sprinkler 3 is provided above the sand basin T. As shown in FIG. 1, this sprinkler device 3 includes a water tank 4 in which water for sprinkling (mainly industrial water is used) is stored, and a main pipe 5 for pumping water from the water tank 4. , Sprinkling pipes A _{1 to} An that are branched from the main pipe 5,
A pump P is provided in the middle of the main pipe 5, which pumps water from the water tank 4 and supplies high-pressure water to the sprinkler pipes A _{1 to} An via the main pipe 5. Two electric valves 6 for adjusting the amount of water supplied are provided on the downstream side of the pump P in the main pipe 5.

The main pipe 5 is located approximately in the center of the sand basin T,
A little above the specified water level of the sewage, the sewage pipes A _{1 to} An are horizontally extended from the main pipe 5 of this portion at equal intervals to each other horizontally. It is branched orthogonally to the flow direction. (Here, sprinkler pipes A ₁ , A ₂ , A ₃ ... An are provided from the upstream side to the downstream side of the sewage.)
Each of the sprinkling pipes A _{1 to} An is provided with a plurality of nozzles (not shown) for spraying spray-like water diagonally downward in the sewage flow direction at equal intervals along the longitudinal direction with respect to the sewage surface. ing.

At the inlet of each sprinkling pipe A ₁ ~ An, from the main pipe 5 to each sprinkling pipe A ₁ ~
Motor-operated valves B _{1 to} Bn for controlling the supply of water into An are provided respectively.

Each of these electric valves B ₁ to Bn is being opened and closed by a driving device (not shown), the drive value by a timer provided on the downstream side from those provided in the watering pipe A ₁ on the upstream side Open one after another at regular intervals,
And it is controlled to repeat this operation. That is, high-pressure water in the form of spray from each sprinkler pipe A _{1 to} An spouts from one sprinkler pipe at regular time intervals from the sprinkler pipe A ₁ on the most upstream side to the sprinkler pipe An on the most downstream side. After the ejection from the downstream side sprinkling pipe An is completed, the cycle is repeated in which the spouting from the uppermost stream side sprinkling pipe A _{1 is performed} again.

A mixer 7 (agitator) for agitating the sludge settling in the sand basin T is provided below the water spray pipes A _{1 to} An on the upstream side. This mixer 7 has a second
As shown in the figure, it is attached to a guide post 8 which is erected from the bottom of the sand basin T, and is normally placed in the sludge settling in the sand basin T. As shown by the arrow (a) in FIG. 1, the mixer 7 blows out a water stream obliquely upward and downstream of the sand basin T. Further, the mixer 7 can be pulled up along the guide post 8 and taken out of the sewage for maintenance or the like.

In addition, there is a side wall inside the sand basin T, and the sand basin T
A level switch 9 that is turned on when sewage reaches the water level position is provided at the specified water level position. The level switch 9 is electrically connected to the pump P of the sprinkler 3, the mixer 7, and a timer for controlling the drive of the electric valves B _{1 to} Bn provided in the sprinklers A _{1 to} An. In response to the signal generated when the level switch 9 is turned on, these are activated at that time.

In addition, 10 in FIG. 2 is a conveyor screen for capturing coarse dust such as vinyl and wood chips contained in the sewage,
The dust captured on the screen 10 is transferred to a belt conveyor 11 provided above the sand basin T and sent to another processing facility.

In the scum treatment facility, when the sewage is supplied to the sand basin T and the water level reaches a predetermined level, the level switch 9 is turned on, the pump P of the water sprinkler 3 and the electric valves B of the water sprinklers A _{1 to} An. _The timer for driving and controlling _{1 to} Bn and the mixer 7 operate simultaneously.

When the pump P operates, the water in the water tank 4 is sent at high pressure in the main pipe 5 toward the sprinkler pipes A _{1 to} An, and the operation of the timer causes the motor-operated valves B _{1 to} Bn to operate as follows. Open from the sprinkler pipe A ₁ on the most upstream side to the one on the most downstream side in sequence for a fixed time, and repeat this operation. Thereby, from the sprinkling pipe A ₁ on the most upstream side to the sprinkling pipe An on the most downstream side, the sprayed high-pressure water is sprinkled toward the downstream side of the surface of the sewage in order from each sprinkling pipe A _{1 to} An. This cycle is repeated.

By such a sprinkling action by each sprinkling pipe A ₁ ~ An,
The scum on the surface of the sewage is crushed and made to flow to the downstream side of the sewage, and is dropped into the pump well T ₁ .

In addition, when the mixer 7 operates, the sludge settling in the sand basin T is made to flow downstream and dropped into the pump well T ₁ . Further, the water flow accompanying the flow of the sewage is blown to the scum on the sewage surface and the water surface swells, so that the scum is crushed and is made to flow downstream.

As mentioned above, according to this scum treatment facility,
The scum generated on the sewage surface is easily and quickly crushed by the spraying high-pressure water sprinkling from the water sprinkling device 3 and the agitating action of the sludge in the mixer 7, and is made to flow to the downstream side to be quickly pumped. Dropped into well T ₁ .
In addition to the flow of sewage, the sludge, which is the source of scum, is made to flow to the pump well T ₁ by the mixer 7, so it is dropped into the pump well T ₁ early, and therefore the generation of scum is reduced. It is possible to suppress the generation of sludge odor.

Further, the pump P of the sprinkler 3, the electric valves B _{1 to} Bn of the sprinklers A _{1 to} An, and the mixer 7 are automatically turned on by the level switch 9 which is turned on when the sewage reaches the specified water level of the sand basin T. Since it operates automatically, labor saving can be achieved.

Although the sprinkler 3 and the mixer 7 are operated at the same time in the above, depending on the occurrence of scum, a controller for selectively actuating the sprinkler 3 or the mixer 7 may be added to operate only one of them. Such a configuration may be adopted.

[Effects of the Invention] As described above, according to the scum treatment equipment of the present invention, the scum on the surface of the water to be treated is easily sprayed by spraying high-pressure water from the sprinkler and sludge agitating action of the agitator. In addition to crushing in a short period of time, the scum crushed by a sprinkler or agitator, in addition to the flow of the water to be treated, causes the high-pressure water from the sprinkler to quickly force the scum to flow to the downstream side. At the same time, the sludge, which is the source of scum, is quickly dropped into the pump well by the stirrer in addition to the flow of the water to be treated. Therefore, the generation of scum can be reduced and the generation of odor of sludge can be suppressed. Further, the water sprinkler and the agitator are automatically operated by the signal of the level switch, so that the labor can be saved.

[Brief description of the drawings]

1 and 2 are views showing an embodiment of the present invention. FIG. 1 is an overall system diagram of scum treatment equipment according to the present invention, and FIG. 2 is provided with the scum treatment equipment. It is a side view of a sand basin. 3 ... Sprinkler, 7 ... Mixer (stirrer), A _{1 to} An …… Sprinkler pipe, T …… Silver basin, T ₁ …… Pump well.

Claims (1)

(57) [Claims] 1. A scum treatment facility for crushing scum floating and accumulated on the treated water surface of a sand basin in a sewage treatment facility and sending it to a pump well which is attached to the sand basin and stores scum, wherein the pump well comprises: It is installed on the downstream side of the flow direction of the treated water in the sand basin, is provided above the treated water, and sprays high-pressure water diagonally downward with respect to the treated water flow direction on the treated water surface. A sprinkler to sprinkle the scum on the surface of the water to be treated and to flow in the direction of the pump well, and to generate a water stream that is installed below the surface of the water to be treated and diagonally above and downstream of the water to be treated, A stirrer that stirs the sludge settling in the sand basin and causes it to flow in the direction of the pump well, and detects the specified water level of the water to be treated in the sand basin and activates the sprinkler and the agitator when the specified water level is detected. Belief A scum treatment facility comprising a level switch for issuing a signal.