JPH11262791A - Defoaming method and apparatus of excretion type sewage treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leakage of foam to the outside of a treatment tank without taking labor to prevent environmental pollution by suspending a defoaming agent container above the surface of water in the treatment tank by a suspension means to incline or tilt the same by the buoyancy of foam. SOLUTION: A defoaming agent container 1 housing a defoaming agent A is suspended from the lid 5 of the manhole disposed in the upper surface wall 4 of a treatment tank through a suspension means 3 to be positioned at the appropriate position above the surface of the water in the treatment tank. This defoaming agent container 1 is pref. formed into an inverted conical container so as to be easily inclined or tilted and pref. made of wood, a synthetic resin or stainless steel in order to correspond to the corrosive action of excretion. When foaming is generated in the treatment tank and the foam layer on the surface of water becomes a definite height, a float 2 is floated by the buoyancy of foam to tilt the defoaming agent container 1 and the defoaming agent A, for example, an alcoholic defoaming agent is sprinkled over the foam to eliminate the foam. By this constitution, defoaming is performed without requiring labor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defoaming device and a defoaming method for defoaming generated bubbles in a treatment tank in which sewage to be treated foams in a human wastewater treatment device.

[0002]

2. Description of the Related Art Conventionally, as a method for treating human wastewater (hereinafter simply referred to as human waste) such as human waste or human waste septic tank sludge, an activated sludge treatment tank, a combined apparatus of a nitrification tank and a denitrification tank or a single tank is used for nitrification. A method using a biological treatment apparatus such as a single treatment tank for denitrification is used.

[0003] In the above-mentioned method of treating human waste, foaming is extremely easily performed due to a foam-promoting substance derived from a polymer substance such as protein, lipid and saccharide contained in human waste, and a large amount of foam layer is formed. You. In particular, in a treatment tank such as a nitrification tank that performs aeration treatment with air or a treatment tank that performs gas stirring, the liquid in the tank is vigorously stirred and fluidized, so that more intense foaming is caused.

[0004] In recent years, due to the reduction of the installation area of the human waste treatment apparatus and the shortage of industrial water, high-load processing with no dilution or low dilution has been pursued. As the situation becomes even more intense, countermeasures have become important.

Therefore, conventionally, in the treatment tank in which the wastewater to be treated foams, a defoaming agent such as a silicon-based or alcohol-based defoamer is sprayed by a sprayer or a dropper, or a large amount of defoamed water is sprayed. Spraying or spraying with a bucket or the like by hand is performed to suppress foaming and to eliminate bubbles.

[0006]

The suppression and defoaming of the defoaming agent in the treatment tank in which the sewage to be treated foams by spraying or spraying the defoaming agent with a sprayer or a dropper are cases where the foaming is small and there is no hindrance to the operation. However, since the defoaming agent is constantly sprayed continuously, the cost of chemicals increases, and operating conditions such as changes in the properties of the wastewater to be treated and the amount of air aeration, as well as fluctuations in the temperature and load, etc. In some cases, it may not be possible to cope with a situation where foam changes violently. In such a case, a large amount of an antifoaming agent is sprayed at once with a bucket or the like. Also, the method of injecting a large amount of defoamed water results in an unnecessarily large throughput.

Further, when the above phenomenon occurs in a thin time zone such as at night, bubbles are leaked out of the tank through a gap in a manhole which is opened at the top of the processing tank and covered with a steel lid or the like. As a result, there is a problem that the odor may be generated and the surrounding environment may be polluted. In addition, there is a problem that an operation trouble of the deodorizing device which deodorizes by sucking the gas in the processing tank.

Accordingly, the present invention provides a method for automatically defoaming a treatment tank in which a wastewater to be treated foams in a human wastewater treatment apparatus when a foam layer having a certain height or more may be obstructed. Because the agent is sprayed, even when foaming violently, there is no need for human intervention and it can be dealt with reliably,
An object of the present invention is to provide a defoaming apparatus and a defoaming method which can prevent a foam from leaking out of a tank to generate an odor and to contaminate the surrounding environment.

[0009]

The gist of the present invention for achieving the above object is as follows.
In a treatment tank in which sewage to be treated foams in a human wastewater treatment apparatus, a defoaming agent container that is inclined or falls due to the buoyancy of the foam is provided at an appropriate position on the water surface in the treatment tank by suspending means. A defoaming device for a human wastewater treatment device.

[0010] In the second aspect of the present invention,
In the treatment tank in which the sewage to be treated in the human wastewater treatment apparatus foams, the sewage is discharged to a defoaming agent container which is inclined or falls by the buoyancy of the foam provided by suspending means at an appropriate position on the water surface in the treatment tank. A defoaming method for a human waste-based sewage treatment apparatus, characterized in that a foaming agent is put in, and the defoaming agent container is tilted or turned over by the buoyancy of the generated foam layer to spray and defoam the defoaming agent.

[0011] Since it is a simple device in which a defoaming agent container which inclines or falls due to the buoyancy of the foam is simply provided by suspending it at an appropriate position on the water surface in the processing tank by a suspending means, the equipment cost is low. Since the defoaming agent container is tilted or turned over by the buoyancy of the generated foam layer to automatically spray and defoam the defoaming agent, it is possible to surely defoam without the need for human intervention.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an antifoaming device in a human wastewater treatment apparatus according to an embodiment of the present invention, and FIGS. 2A and 2B are perspective views of an antifoaming container section.
(A) shows an inverted conical container with a circular arc at the top, and (B) shows an inverted triangular pyramid container with a triangular surface on one side of the cone.

1 is a defoamer container for containing the defoamer A,
Since the buoyancy of the foam layer is not so strong, an inverted cone-shaped container is preferable so as to easily tilt or fall over. Further, since night soil has a large corrosive action, the material constituting the defoamer container 1 is wood, synthetic resin or Stainless steel is preferred. However, the present invention is not limited to these.

Further, in order to make the defoaming agent container 1 more easily inclined or fall, a float 2 as shown in FIG. 2A is provided at the bottom of the defoaming agent container 1, that is, at the top of the inverted cone. Preferably, an air chamber 6 is provided, as shown in FIG. 2 (b), and a flared defoamer pouring section is further provided at a part of the upper opening.

The float 2 may be a sphere, a rectangle, a container, or the like. The material may be wood, synthetic resin, stainless steel, or the like. Are preferable from the viewpoint of buoyancy, ease of production, and the like. In order to attach the float 2 to the defoamer container 1, an engaging member such as a metal rod, a metal chain, a beam, or a synthetic fiber string is used, and is fixedly or movably engaged. Is done.

Reference numeral 3 denotes a suspending means for arranging the defoamer container 1 at an appropriate position on the water surface in the treatment tank. A metal chain, a beam, a synthetic fiber string or the like is used. It is preferable to use a metal chain made of copper or the like because it is strong against corrosion and has high strength, and the defoaming agent container easily tilts or falls.

Reference numeral 4 denotes an upper wall of the processing tank, and reference numeral 5 denotes a manhole cover opened in the upper wall. The defoamer container 1
Is suspended by the suspending means 3 from a suspending member provided on the lower surface of the cover 5 of the manhole, but may be suspended from a suspending member provided on the lower surface of the upper wall 4 of the processing tank. A suspension member protruding from the side wall of the tank may be provided so as to hang down.

In the apparatus having the above structure, a spraying device such as a sprayer or a dropper for spraying the antifoaming agent A is used in combination with the defoaming device for defoaming during normal operation. It is also preferable to install it internally.

The operation of the present invention will be described below with reference to FIG. In a treatment tank in which the wastewater to be treated foams, such as a nitrification tank that oxidizes and decomposes organic matter in the wastewater to be treated biologically, such as night soil, and oxidizes ammonia-based nitrogen, a manhole opened on the upper wall of the treatment tank is used. The lid 5 is opened, the defoaming agent container 1 is taken out, a defoaming agent A such as a silicon type or an alcohol type is put therein, the lid 5 of the manhole is closed, and the water surface in the processing tank is suspended via the suspending means 3. Hang it in the appropriate position above.

When foaming is induced in the treatment tank and the foam layer formed on the water surface reaches a certain height and comes into contact with the float 2 so as to wrap the float 2, the float 2 floats due to the buoyancy of the foam layer. When the bottom of the defoamer container 1 rises and becomes inclined as the float 2 floats, the defoamer A is sprayed from the defoamer container 1 to the spilled foam layer.

When the foam is defoamed by spraying the defoaming agent A and the height of the foam layer is reduced, the buoyancy of the foam layer applied to the float 2 is reduced. And the spraying of the antifoaming agent A is automatically stopped.

In a normal foaming state of the sewage to be treated, an antifoaming agent spraying device such as a sprayer or a dropper (not shown) may be provided in parallel to spray the antifoaming agent A constantly or intermittently. Good.

When foaming in the processing tank is severe,
Since the float 2 floats rapidly, the defoaming agent container 1 falls down, and a large amount of the defoaming agent A is sprayed at a time, and the foam layer formed by vigorous foaming can quickly disappear. it can.

Therefore, it is possible to reliably cope with intense foaming in a thin time zone such as at night without the need for human intervention, and the foam leaks out of the tank to generate a bad smell and contaminate the surrounding environment. Is prevented.

[0025]

According to the present invention, in a treatment tank in which effluent to be treated foams in a human wastewater treatment apparatus, when a foam layer having a certain height or more is generated and there is a possibility that operation may be hindered, it is automatically turned off. The foaming agent is sprayed, so it is possible to prevent violent foaming, etc. without the need for human intervention, and it is possible to prevent foam from leaking out of the tank, generating odor and contaminating the surrounding environment. A foaming device and a defoaming method.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an antifoaming device in a human wastewater treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of an antifoaming container according to one embodiment of the present invention.

[Explanation of symbols]

 1: Defoamer container 2: Float 3: Suspension means 4: Upper wall of treatment tank 5: Manhole cover 6: Air chamber

Claims (2)

[Claims] 1. A defoaming agent container which is inclined or falls down due to buoyancy of foam in a treatment tank in which sewage to be treated in an excrement wastewater treatment apparatus foams, is suspended by a suspending means at an appropriate position on the water surface in the treatment tank. An antifoaming device for a human wastewater treatment device, wherein the defoaming device is provided. 2. In a treatment tank in which sewage to be treated is foamed in a human wastewater treatment apparatus, an incline or tipping caused by the buoyancy of a foam provided by hanging means at an appropriate position on the water surface in the treatment tank. A defoaming method for a human wastewater treatment apparatus, characterized in that an antifoaming agent is put in a foaming agent container, and the antifoaming agent is tilted or turned over by the buoyancy of the generated foam layer to spray and defoam the antifoaming agent. .