JPH03217526A - Soiled water suck-up device for building pit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a building pit sewage pumping device for pumping up sewage in a building pit provided underground of a building using a pump and discharging it into a sewage pipe.

<Conventional technology> Generally, in buildings, a pit is set up underground on the premises to store sewage and other wastewater generated in the building, and the water is pumped once or several times a day using a submersible pump immersed in the bit. Sewage is pumped up and drained from the building premises through underground pipes to sewage pipes installed along the road outside the building. In this case, the bottom of the bit tends to become anaerobic due to the accumulation of putrid components, so when the pump starts pumping up the wastewater in the bit and draining it from the underground pipe to the sewage pipe,
Foul odors mainly composed of hydrogen sulfide are emitted from sewage and rainwater basins installed in underground pipes, and become the source of odor pollution in the neighborhood.

For this reason, some local governments regulate the concentration of hydrogen sulfide in the gas generated in wastewater masses to 10 ppm or less, and the hydrogen sulfide in wastewater to be drained to 2 mg/β or less. Conventionally, the following methods were used: ■Continuously stir or blow air to prevent the inside of the building pit from becoming anaerobic; ■Inject deodorizer all at once through a manhole installed in the earthen wall of the building pit. .

<Problem to be solved by the invention> However, in order to take the above measure (■), the agitator and air supply nozzle must be immersed in the dirty water of the bit, which causes dirt, corrosion, etc., and is extremely difficult to maintain. It takes time.

In addition, in the case of the measure (2), the deodorizing agent added all at once dissolves in fresh waste water where the surface of the bit has not yet deteriorated, and is wasted.

Therefore, in order to have a deodorizing effect on the rotten sewage at the bottom that requires deodorization, a very large amount of deodorizing agent must be added.

<Means for Solving the Problems> Therefore, the present invention provides a sewage pumping device for a building pit that uses a pump to pump up sewage in a building pit and drains it into a sewage pipe, in which a deodorizing agent is placed near the building pit. A tank is installed, and a chemical injection pump is provided for sucking the deodorizing agent in the tank and delivered to the vicinity of the suction port of the pump, and a control means is provided for interlocking the chemical injection pump with the pump. It was.

Example of implementation In the illustrated example, 1 is a building, 2 is a building pit installed underground on the premises, and a submersible pump 3 is installed at the bottom of the bit to pump water as described above. When the raising pump is operated, the waste water in the bit is pumped up to the underground pipe 4 through the lift pipe of the pump, and drained from the underground pipe to the sewage pipe 5 laid along the road outside the building site. There is. In addition, 6 indicates a manhole provided on the upper wall of BIT 2, 7 indicates a sewage basin, and 8 indicates a rainwater basin provided outside the premises of the building.

Near the bit 2 is a tank 11 containing deodorant liquid,
In this embodiment, a chemical dosing pump 12 is installed, a pipe 13 is connected to the discharge port of the chemical dosing pump 12, and the tip of the pipe 13 is connected to the suction port of the pump pump 3 installed at the bottom of the bit 2. It is located nearby.

In order to interlock the operation of the chemical injection pump l2 with the operation of the pumping pump, the wiring of both pumps is connected to the power distribution board 14, and when a switch is turned on at the power distribution board 14, both pumps can be operated in conjunction with each other.

As a result, when the pump 3 is operated to drain the waste water inside the bit to the sewage pipe 5, the chemical injection pump 12 is also operated in conjunction with this, and the deodorant liquid in the tank 11 is pumped up from the water in the bit. Inject near the suction port of the lift pump.

Therefore, since the pump pumps up the waste water injected with the deodorant from the bottom of the bit and drains it into the sewage pipe, the concentration of hydrogen sulfide in the air at the waste water tank installed in the middle of the underground pipe is At the same time, hydrogen sulfide in wastewater discharged into sewage pipes will also be drastically reduced.

The data for the case where no deodorant is added, the case where the deodorant is injected into the bit from the manhole all at once, and the case where the deodorant is injected into the waste water at the bottom of the bit using the chemical dosing pump according to the present invention are as follows. be. All measurements were performed using the Kitagawa detector tube method.

No pump operation Addition Bulk injection 2.5 minutes after startup 5 minutes after startup 2.5 minutes after startup 5 minutes after startup Hydrogen sulfide concentration in the air of the wastewater mass (ppm) 2 20 200 1 80 30 1 5 l1 In the liquid Hydrogen sulfide (mg/l) Not measured Not measured 3 ND ND ND Injection (invention) Immediately after startup 8 ND 2.5 minutes later I ND 5 minutes later ND
ND It is preferable that the chemical injection pump is started first, and the pumping pump is started a little later.

<Effects of the Invention> According to the present invention, it is possible to completely eliminate the bad odor that occurs without wasting the use of deodorant.

[Brief explanation of drawings]

The drawing is a flow sheet showing an embodiment of the present invention, and in the drawing,
1 is the building, 2 is the bit, 3 is the pump, 5 is the sewage pipe, 6 is the manhole, 7 is the sewage mass, 11
12 indicates a deodorant tank, and 12 indicates a chemical dosing pump.

Claims (1)

[Scope of Claims] A sewage pumping device for a building pit that uses a pump to pump up sewage from a building pit and drains it into a sewage pipe, wherein a tank containing a deodorant is installed near the building pit, and a tank containing a deodorizing agent is installed in the vicinity of the building pit. A building pit characterized by being provided with a chemical dosing pump for sucking the deodorizing agent inside and delivering it to the vicinity of the suction port of the pump, and a control means for interlocking the chemical dosing pump with the pump. Sewage pumping equipment.