JP2005111405A - Septic tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a septic tank the sewage cleaning capacity of which is not deteriorated in a cold district with a simple unit and which can surely retain heat of the sewage or heating the sewage in the tank body of the septic tank even when the outside air temperature is low. <P>SOLUTION: This septic tank is composed of: the tank body; a heat insulating cover which is attached freely detachably to an opening on the upper wall part of the tank body and made from polyurethane foam, polyethylene foam, polypropylene foam, glass wool, or the like; and a sewage injecting pipe and a discharge pipe which are connected to the tank body. The discharge pipe is connected to the tank body so that the treated sewage is discharged downward. A heating unit such as a band heater is arranged on the outer periphery of the discharge pipe. It is preferable that a temperature controller is connected to the heating unit and the discharge pipe has a trap structure at its tip part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a septic tank, and more particularly to a septic tank that purifies by a contact aeration method and prevents a decrease in sewage purification power due to a decrease in microbial activity in a low temperature state such as winter.

  Conventionally, the so-called biochemical aeration method, which uses activated sludge to purify sewage, has been actively used for the treatment of sewage. However, since the biochemical aeration method performs aerobic treatment, It is necessary to prepare conditions for the activity of (microorganisms). In particular, the temperature of sewage flowing in the septic tank is an important factor for biological activities.

  The activity of the microorganisms forming the activated sludge is reduced when the temperature is 10 ° C. or lower, and the purification ability is reduced. Therefore, the temperature inside the septic tank is lowered from late autumn to early spring in a cold region, and there is a problem that the purification capacity is lowered.

Therefore, various methods for preventing a decrease in temperature inside the septic tank have been proposed. For example, it consists of a septic tank body, a manhole frame attached to the manhole of the septic tank body, and a manhole cover that is detachably fitted to the manhole frame, and the back surface of the manhole cover can be sealed with the inner peripheral surface of the manhole frame A sewage septic tank (see, for example, Patent Document 1) characterized in that a simple heat insulating material is attached has been proposed.
JP-A-8-337294

  However, in the sewage septic tank, it is possible to prevent snow melting water and cold air from entering the septic tank body, but if it is installed in a cold district for a long time, the septic tank body is cooled and the sewage in the septic tank body is cooled. . Therefore, in the septic tank with a small amount of treatment (the treatment frequency is low), particularly, there is a disadvantage that the sewage is cooled and the treatment capacity is lowered.

Further, as a different method, in a sewage purification tank that purifies sewage with biological sludge formed on the surface of the contact material filled in the contact aeration tank, the contact aeration tank has a diffusion pipe route led from a blower. A sewage septic tank characterized in that a heating means is provided and air heated by the heating means is supplied into at least the contact aeration tank to raise the temperature of sewage in the contact aeration tank (for example, patent document) 2) has been proposed.
JP-A-10-192875

  However, since the septic tank is provided with heating means on the air duct route led from the blower, the apparatus is complicated and expensive, and cannot be applied to a small septic tank that does not aerate. Also, when the discharge pipe is connected to the septic tank body, the position of the sewage inflow pipe is higher than the position of the discharge pipe, so the air from the diffuser pipe is discharged from the inflow pipe, and the cold air flows backward from the discharge pipe, The inside of the septic tank body was sometimes cooled.

  The present invention has been made in view of the above-described problems of the prior art, and can keep warm and heat sewage in the septic tank body even when the outside air temperature is low, even in a cold region, with a simple device, It aims at providing the septic tank which purification capacity does not fall.

  The septic tank of the present invention comprises a septic tank body, a heat-insulating lid body detachably attached to the upper wall opening of the septic tank body, a sewage injection pipe and a discharge pipe connected to the septic tank body, and a discharge pipe Is connected to the septic tank body so that the discharge direction is downward, and a heating device is installed on the outer periphery of the discharge pipe.

  The configuration of the septic tank of the present invention is as described above, the apparatus is simple, and it can be applied to a small septic tank. In a cold region, even when the outside air temperature is low, heat dissipation from the lid body can be prevented.

  In addition, since the discharge pipe is higher on the side connected to the septic tank body, the air heated by the heating device travels through the discharge pipe and moves into the septic tank body, ensuring that the sewage in the septic tank body is kept warm and heated. can do. Therefore, even if the outside air temperature is low in a cold region, the purification capacity of sewage in the septic tank body does not decrease.

  Hereinafter, examples of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples.

  FIG. 1 is a schematic view showing an example of the septic tank of the present invention. In the figure, reference numeral 1 denotes a septic tank body, and heat insulating lids 2 and 2 are detachably attached to upper wall openings 11 and 11 of the septic tank body 1.

  The heat insulating lid 2 may have any heat insulating property as long as it is detachably attached to the upper wall opening 11, and examples thereof include polyurethane foam, polyethylene foam, polypropylene foam, and glass wool. It may be formed of a heat insulating material, or the heat insulating material may be laminated on one surface or both surfaces of a lid made of synthetic resin, metal, wood or the like.

  In addition, it is preferable that the heat insulating cover 2 is in close contact with the upper wall opening 11 so that water or outside air does not enter the septic tank body from the gap between the heat insulating cover 2 and the upper wall opening 11. The heat insulating material which is the said heat insulating material and has a softness | flexibility may be laminated | stacked in the position which touches the upper wall opening part 11 of the body 2. FIG.

  In the figure, reference numeral 3 denotes a sewage inflow pipe connected to the side wall of the septic tank body 1, and the connection portion between the sewage inflow pipe 3 and the septic tank body 1 is low and the inflow side is high so that sewage can flow into the septic tank body 1 by its own weight. So connected.

  In the figure, 4 is a discharge pipe connected to the side wall of the septic tank body 1, and the connection part between the discharge pipe 4 and the septic tank body 1 is high so that the treated sewage can be discharged from the septic tank body 1 by its own weight. It is connected so as to be downward.

  A heating device 5 is installed on the outer periphery in the vicinity of the connection portion of the discharge pipe 4. As the heating device 5, any conventionally known device can be used as long as it can be heated from the outer periphery of the discharge pipe 4, and examples thereof include hot water piping, hot air piping, panel heaters, band heaters, A band heater that can be installed in close contact by simply winding it around the outer periphery without processing the discharge pipe 4 is preferable.

  In addition, it is preferable that a temperature control device is connected to the heating device. With this temperature control device, the temperature of the outside air and the sewage in the septic tank body 1 are sensed, and the sewage temperature is always adjusted regardless of the temperature change of the outside air. It is preferable to control the power supply so as to keep it constant and to save power.

  Further, it is preferable that the end portion of the discharge pipe has a trap structure so that a large amount of cold air does not flow continuously from the discharge pipe side.

  In the septic tank of the present invention, sewage is injected into the septic tank body 1 from the sewage inflow pipe 3, the sewage is treated biochemically in the septic tank body 1, and the treated sewage is discharged from the discharge pipe 4. When the temperature becomes low, the activity capacity of the activated sludge decreases, and the treatment capacity decreases, the air in the discharge pipe 4 is heated by the heating device 5.

  The heated air has a gradient in the discharge pipe 4 and the connection portion side with the septic tank body 1 is high, so it can move into the septic tank body 1 and heat the sewage in the septic tank body 1, The activity capacity of activated sludge does not decrease and the processing capacity does not decrease.

  Moreover, the movement of the heated air is gentle, a large amount of cold air does not flow continuously from the end of the discharge pipe, and the upper wall opening of the septic tank body 1 is covered with a heat insulating lid. Therefore, the sewage in the septic tank body can be reliably kept warm and heated.

It is a schematic diagram which shows an example of the septic tank of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Septic tank main body 2 Heat insulation cover body 3 Sewage inflow pipe 4 Outflow pipe 5 Heating device

Claims (1)

  It consists of a septic tank body, a heat insulating lid that is detachably attached to the upper wall opening of the septic tank body, and a sewage injection pipe and a discharge pipe connected to the septic tank body. The septic tank is connected to the septic tank body, and a heating device is installed on the outer periphery of the discharge pipe.

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