JPH07237Y2 - Sewage treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sewage treatment apparatus, and more particularly to an improvement of a sewage treatment apparatus having a contact aeration chamber.

[Conventional technology]

Conventionally, as a sewage treatment apparatus, a separation contact aeration method, an anaerobic filter contact aeration method, and the like are known.

By the way, in these sewage treatment devices, the biofilm in the contact aeration chamber peels and floats when seasonal properties change or after a long period of time. There was a problem that they could mix and flow out, causing an increase in SS and SS sex BOD.

In order to eliminate such a problem, in the conventional wastewater treatment equipment, the effluent water is guided to the filtration device again to carry out the tertiary treatment, or the effluent water is provided with a third-stage oxidization treatment tank for the tertiary treatment. Is carried out.

[Problems of conventional technology]

However, in any case, the method for performing the above-mentioned tertiary treatment requires tertiary treatment equipment in addition to the septic tank as the sewage treatment device, and since it is necessary to attach drive equipment such as a blower and a pump to these, In addition to increasing the occupied volume, operation management becomes complicated, and there is a problem that it is difficult to implement for home use.

[Problems to be solved by the device]

In consideration of the above-mentioned problems, this device has only one septic tank, and SS
The purpose of the present invention is to provide a sewage treatment apparatus which can prevent the outflow of sewage and can keep the efficiency of sewage treatment constant throughout the day and night and which has good purification efficiency.

[Technology that has solved the problem]

That is, the sewage treatment apparatus of the present invention is a sewage treatment apparatus having a contact aeration tank, wherein a settling tank is provided with a filter layer,
A backwash air diffuser, which is a separate system from the air supply pipe to the contact aeration tank, is provided in the lower portion of the filter layer, and at the same time, the backwash air diffuser pipe is provided in the upper portion of the filter layer. An sewage treatment apparatus comprising an air lift pump for returning the treated sewage to be supplied to the inflow chamber of the sewage raw water, and a blower device for supplying air to the air supply pipe is provided with an operation control timer.

〔Example〕

 Next, an embodiment of this invention will be described.

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of FIG.

The sewage treatment apparatus 1 of this invention divides one tank into multiple tanks,
Sedimentation separation chamber or anaerobic filter bed first tank into which raw wastewater flows
Alternatively, the second tank 1A, 1B, the contact aeration tank 1C, the settling tank 1D and the disinfectant tank 1E, and in the wastewater treatment device that sequentially transfers the wastewater, the settling tank 1D is composed of 2A such as gravel, sand layer or resin fiber layer. A filter layer 2 is provided, and a backwash air diffuser pipe 6 is provided below the filter layer 2 as a system separate from the blower 4 and the air supply pipe 5 for supplying air to the air diffuser pipe 3 in the contact aeration tank 1C. At the same time, an air lift pump 8 for returning the backwash treated wastewater to the inflow tank 1A of the wastewater raw water is connected to the air supply pipe 7 for the backwash diffuser pipe 6 above the filter layer 2, and the air supply pipe is further provided. The blower 9 that supplies air to 7 has a timer 10 for operation control.
Is attached.

In addition, 1F in the figure shows a flow rate adjusting air lift pump that transfers the treated water from the precipitation chamber 1D to the disinfection chamber 1E.

In the above-described embodiment, the timer 10 is configured to operate the blower 9 only for a fixed time at midnight throughout the day and night, and to stop the blower 9 at other times.

Further, in the above, as the filter medium constituting the filter layer, in addition to the above fine sand, coarse sand, gravel and the like, resin particles and the like can be used.

[Action]

In this device, the contact aeration tank 1C is normally used.
The treated sewage transferred to the settling chamber 1D passes through the filter layer 2 before reaching the disinfecting tank 1E, so that SS is almost completely filtered and removed in this portion.

Therefore, SS in runoff water decreases and SS BOD value decreases.

On the other hand, the floating sludge filtered in the filtration layer 2 stays in the filtration layer 2, and if left unattended, it causes clogging.

However, by the backwash air diffuser 6 which is intermittently operated by the timer 10, these are re-suspended by backwash, and this is returned to the tank 1A into which the raw wastewater flows by the air lift pump 8 above the filtration layer 2 and automatically. Will be removed.

Therefore, the clogging of the filtration layer 2 is sufficiently prevented.

Further, since the sludge return by the air lift pump 8 is performed at midnight time when the raw water of the wastewater does not flow in, the wastewater is reprocessed by recirculation in preparation for the next peak of the wastewater inflow. Outflow of untreated sewage can also be prevented.

Also, when the total liquid level in the tank is adjusted by the flow rate adjusting air lift pump 1F, the water level becomes low during the midnight time and the outflow of dirty water during backwashing can be completely prevented.

〔effect〕

As explained above, even if floating sludge is generated in the contact aeration tank, it is almost completely removed by the filtration layer of the sedimentation tank, so there is no risk of SS being mixed into the outflow water. , Also, SS of the filtration layer by timer control
Is re-suspended and returned to the inflow port of the wastewater by the air lift pump, which effectively prevents the rise of the BOD value of the outflow water.

Further, since the whole is stored in one tank, it has various practical effects such as compactness and easy installation.

[Brief description of drawings]

FIG. 1 is a sectional view of the present invention, and FIG. 2 is an enlarged view of a main part of FIG.

Claims (1)

[Scope of utility model registration request] 1. A sewage treatment apparatus having a contact aeration tank, wherein a settling tank is provided with a filter layer, and a lower part of the filter layer is provided with a system separate from an air supply pipe to the contact aeration tank. In addition to the air diffuser for washing, an air lift pump for returning the treated sewage, which is supplied at the same time as the air diffuser for backwashing, to the inflow chamber of the sewage raw water is provided in the upper part of the filter layer, and the air supply pipe The blower device for supplying air to the equipment is provided with a timer for operation control, which is a sewage treatment device.