JPH0834734B2 - Sewage treatment method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently treating sewage with a single residue dehydrator.

[0002]

2. Description of the Related Art In the conventional sewage treatment method, the sewage introduced from the sewage is removed by a dust remover to remove the solid matter in the sewage as a residue, and the collected residue is washed and then dehydrated for disposal or incineration. Processing.

[0003]

[Problems to be Solved by the Invention] Conventional sewage treatment requires equipment such as a dust remover, a washer, and a dehydrator, and although there is no problem in a large sewage treatment plant, it is not suitable in a small treatment plant. is there.

An object of the present invention is to reliably treat sewage even in a small-scale sewage treatment plant.

[0005]

The present invention has been made in order to achieve the above-mentioned object, and it supplies the waste water from the sewer directly or by a pump to the water receiving tank of the residue dehydrator, and the water receiving tank The sewage supplied from the water receiving tank is filtered by the plunger reciprocating in the cylindrical screen of the screen residue dewatering machine provided at the bottom, and the screen residue captured in the screen is dehydrated under pressure. The gist is that the wastewater, which has been transported and discharged in the transport duct connected to the dehydrator, and is filtered and separated from the residue, is introduced to the aeration tank directly or through the pump well to be aerated.

[0006]

[Function] The sewage from the sewer is introduced into the residue dehydrator in which the plunger reciprocates in the cylindrical screen. Sewage is filtered on this screen, and solid matter is trapped in the screen as screen residue, and when this reaches a fixed amount, the plunger is advanced to bring it into a pressurized state to dehydrate the screen residue. The residue is also washed by the pressure and the water pressure of the inflowing wastewater. The residue after pressure dehydration is guided into a transfer duct connected to a cylindrical screen and is transferred and separated from sewage and discharged or discharged as a bag. On the other hand, the sewage after removal of residue and the dewatered water during residue removal are guided to an aeration tank and treated by aeration.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. In the figure, A is a screen residue dehydrator, which is composed of a hopper-shaped water receiving tank 2 to which a sewage inflow pipe 1 is connected, and a screen residue dehydrator main body 3 arranged below the water receiving tank 2. Composed. The residue dehydrator main body 3 has a cylindrical screen 4 connected to an outlet provided at the bottom of the water receiving tank 2,
It is composed of a plunger 5 that reciprocates in the screen 4 and a transport duct 6 that transports the residue that has been pressurized and dehydrated by the plunger 5.

Therefore, the sewage introduced directly into the sewage inflow pipe 1 or into the pit 10 as shown in FIG.
When the sewage is introduced into the water receiving tank 2 through the sewage supply pipe 12 at, when the plunger 5 is retracted to the standby position, it passes through the discharge port at the bottom of the water receiving tank and into the cylindrical screen 4 of the residue dehydrator body. The solid matter in the sewage supplied, that is, the residue, is filtered by the screen, and only the sewage is supplemented and flows down into the sewage receiving tank 9 provided below the screen. The size of the screen residue captured by this screen is predetermined by the width of the mesh of the cylindrical screen 4.

[0009] When the amount of the screen residue captured in the screen reaches a certain amount for a certain period of time or when it is detected by a sensor or the like and the cylinder 51 is operated to move the plunger 5 forward, the screen residue in the screen is Is dewatered under pressure, and the desorbed water flows down through the screen to the sewage receiver below, and the dewatered residue is pushed into the transfer duct 6 connected to the screen 4 and sequentially transferred. The residue is washed in the cylindrical screen by the pressure applied by the plunger and the water pressure of the inflowing sewage. The conveying duct 6 is provided with a back pressure device 7, and the combination of the driving of the back pressure device 7 and the reciprocating operation of the plunger 5 depressurizes and drains the residue when pushing the plunger forward, and pushes it into the duct. Further, it is designed to be transported in the duct.

A bag 8 is detachably attached to the tip of the transport duct 6 so that the residue is dehydrated and the residue is automatically packed.

On the other hand, the sewage flowing into the sewage receiving tank 9 is introduced into the sewage pit 13 as shown in FIG.
4. Water is sent to the aeration tank 16 through the sewage pipe 15, or as shown in FIG. 2, the sewage receiving tank 9 is allowed to directly flow into the aeration tank 16 through the sewage pipe 15. And this aeration tank 16
The waste water is agitated and aerated to be treated.

[0012]

According to the wastewater treatment method of the present invention, the wastewater from the sewer is supplied directly or by a pump to the water receiving tank of the residue dehydrator, and the cylindrical screen of the residue dehydrator provided at the bottom of the water receiver. The sewage supplied from the water receiving tank is filtered by a plunger that reciprocates in the inside, and the residue captured in the screen is washed and pressurized and dehydrated, and then transferred in a transfer duct connected to this residue dehydrator. The wastewater from which the residue has been filtered and separated is introduced directly or through a pump well to the aeration tank for aeration treatment, so even small-scale sewage treatment plants can easily and efficiently treat sewage. Can be done consistently. In addition, the equipment is simple and can be used in a small space.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a first embodiment, in which inflow sewage is directly dewatered by a residue dehydrator to separate sewage, and the sewage is pumped up to an aeration tank.

FIG. 2 is an explanatory view showing a second embodiment and sending sewage to a residue dehydrator with a pump.

[Explanation of symbols]

 A Sludge dewatering machine 1 Sewage inflow pipe 2 Water receiving tank 3 Sludge dewatering machine main body 4 Cylindrical screen 5 Plunger 6 Conveying duct 9 Sewage receiving tank 10 Pit 13 Sewage pit 15 Sewage feeding pipe 16 Aeration tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B01D 29/11 C02F 11/12 C

Claims (1)

[Claims] 1. A plunger for supplying sewage from the sewer directly or by a pump to the water tank of the residue dehydrator, and reciprocating in a cylindrical screen of the residue dehydrator provided at the bottom of the tank. After filtering the sewage supplied from the water receiving tank in order to dehydrate the residue trapped in the screen under pressure, the residue is transported in the transport duct connected to this residue dehydrator and discharged. The sewage treatment method is characterized in that the sewage separated by filtration is introduced into the aeration tank directly or through a pump well to perform aeration treatment.