JPS6313743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Prior Art] The present invention mainly relates to a sand lifting and cleaning device used in a settling basin of a sewage treatment plant. Conventionally, the bucket conveyor method, sand pump method, and vacuum suction method have been mainly used to pump sand into the settling pond, and each method has its advantages and disadvantages, and which method to use depends on the conditions at the time. It was determined by.

However, recently, land for sewage treatment plants has been secured,
Due to the harsh surrounding environment, settling ponds that emit a strong odor are increasingly being buried underground.

In underground settling basins, the sand pump method or the vacuum suction method has been mainly used because the installation space is small and the transport route for the sand can be set relatively freely.

The pumped sand contains organic matter or soy and produces a strong odor, so it is washed in a cleaning tank to separate the sand, organic matter, and soy.
Sand was disposed of by landfill, and debris was disposed of by landfill or incineration.

(Special Publication No. 59-43221) [Problems to be solved by the invention] However, in sand pump type sand pumping, the blades may be damaged due to circular objects such as stone chips and iron pieces mixed in the sand, and the blades may wear out rapidly. There was a problem with this.

In addition, most of the sewage sediment is transported using conveyors, and although the conveyor is covered with a cover to prevent odors and scattering, from a maintenance perspective, it does not provide airtightness or watertightness, and the odor However, there was also the problem that sewage still spattered.

An object of the present invention is to provide a method for transporting and storing sediment that allows sand to be lifted without any trouble even if solid matter is present in the sediment, and that almost completely prevents odor leakage and scattering of sediment. be.

[Means for Solving the Problems] The present invention aims to provide a method that eliminates these drawbacks and performs water separation, transportation, and storage without any trouble through smooth suction. The gist of this is that a vacuum device, a tank, and a pipe are connected, one end of the pipe is placed facing the surface of the sewage sediment, air is supplied to the pipe, the sand is lifted up by the vacuum and air, and the sewage is pumped into the tank. A screw conveyor is installed, which is stored and agitated with paddles and air supply to separate the sediment into sand, organic matter, and float. A screw conveyor is installed that communicates with the inside of the tank through a gate, and the gap between the gate and the screw conveyor is A dust remover is installed in the sand to remove floating particles, and a drainage port is installed near the water surface of the screw conveyor to drain the floating organic matter along with the sewage, and the sand is drained on the screw conveyor and discharged to the processing sand basin. A vacuum device, a hopper, and a pipe are provided in communication with each other, and one end of this pipe is placed upright in a processing sand basin to supply air, and the sand is lifted by the vacuum and air and temporarily stored in the hopper. Features.

[Example] An example of the present invention will be described based on FIG. 1.
A pipe 3A having a substantially vertical suction port is provided in a settling basin 2A of a settling basin 1A, and is connected to a vacuum tank 5 via a valve 4A. The tank 5 has a vacuum device 9, a paddle agitator 6, and a nozzle pipe 7 communicating with the inside.
and a drain valve 17 are provided. On the other hand, an air pipe 10A is provided so as to communicate with the blower 8 and the nozzle pipe 7, and further communicate with the lower end of the pipe 3A via a valve 7A. A screw conveyor 14 is provided in a tank 5A communicating with the inside of the tank 5, a dust remover 12 with a gate 11 and a bar screen is provided in a space between it and the tank 5, and a drain port 15 is provided near the water surface 13 of the screw conveyor 14. A drain valve 16 is provided at the bottom. A pipe 2 with a suction port is provided with a processing sand sump 18 below the discharge port 14A of the screw conveyor 14.
0 is erected and installed internally, and the inside of the hopper 22 and the pipe 20 are communicated. A pipe 23 is provided to communicate the inside of the hopper 22 and the vacuum device 9, and a pipe 21 is provided to communicate the lower end of the pipe 20 and the blower 8. Sand basin 1
If there are a plurality of A's, a pipe 3B, a valve 4B, a valve 7B, and an air pipe 10B are arranged in parallel in each of the settling basins 2B of the settling basin 1B.

Based on the above configuration, the sand 19 of the sand settling basin 2A is
A is pumped with sewage into the tank 5 through the pipe 3A and the valve 4A by the suction force of the vacuum device 9. Mechanical stirring is performed by a paddle stirrer 6 in the tank, and air from a blower 8 is injected through a nozzle pipe 7 for stronger stirring. On the other hand, the air supplied by the blower 8 is discharged upward from the lower part of the pipe 3A into the tank 5 as air bubbles, mixed with the sediment 19A and sewage. Vacuum negative pressure inside pipe 3A (approximately -450mmHg)
Using positive air pressure of 0.2 kg/cm ² , the sand is pumped into tank 5 as sediment 19A containing a large amount of sewage. By incorporating air, the dynamic pressure and stirring action allow for a larger amount of sand to be lifted than by vacuum suction, and larger solids can also be easily sucked up. Air supply to the tank 5 is switched by a valve 7A. During vacuum suction, mixed air is discharged into the tank 5, and the mixed and secondary treated sediment 19 is separated into sewage, organic matter, and sediment, and when the gate 11 is opened and drained from the drain port 15, water flow Then, the dust is collected on the bar screen of the dust remover 12 and discharged. The sediment 19B from the 12 dust removers is deposited on the lower surface of the screw conveyor 14, and organic matter and thin particles float near the water surface 13 and are separated from each other at this portion. Clean drainage from the tank 5 and the screw conveyor 14 passes through drain valves 17 and 16, and then to the drain port 1.
The wastewater from No. 5 is also discharged to the settling basin 1A.

The sand 19B is drained and conveyed upward in the screw conveyor 14, and the treated sand 19C is sucked into the treated sand sump 18 from the discharge port 14A and stored as waste sand 19D. Air is sent from the blower 8 to the lower part of the pipe 20, and the treated sand 19C mixed with air by the vacuum and air is lifted. The waste sand stored in the hopper 22 is drained appropriately and drained into the truck 25, and transported to a disposal site.

[Effects of the Invention] The present invention configured as described above smoothly lifts all of the sediment accumulated in the sand settling basin without clogging and collects it in the hopper as washed treated sand, making it easy to find a disposal site as waste sand. This is possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a flow system of the present invention. 2A, 2B: Sediment, 3A, 3B: Pipe, 5:
Tank, 5A: Tank, 6: Paddle stirrer, 7: Nozzle pipe, 8: Blower, 6: Paddle stirrer, 7: Nozzle pipe, 11: Gate, 12: Dust remover, 14: Screw conveyor, 18: Processing Sunadome, 20: Pipe, 22: Hotsupa, 23: Pipe.

Claims (1)

[Claims] 1. Sediment from a sewage settling pond is lifted and washed in a washing tank, and the residue therein is removed with a screen.
The sand is carried out while being drained using a screw conveyor, and the organic components are discharged together with the cleaning waste water.In the sand transportation and cleaning method, vacuum suction and air blowing are performed using a suction pipe connected to a cleaning tank that puts the sediment under negative pressure. A method for conveying and cleaning sand, which is characterized in that the sand is pumped into a cleaning tank in combination, and the sand is agitated and cleaned in the cleaning tank. 2. The method for transporting and cleaning sediment as set forth in claim 1, wherein the stirring and cleaning uses a combination of mechanical stirring and air jetting. 3. The method for conveying and cleaning sediment according to claim 1, characterized in that the cleaning wastewater containing organic components is returned to the settling basin.