JPH08108192A - Foamed scum treatment apparatus - Google Patents

Abstract

PURPOSE: To certainly prevent the outflow of foamed scum to a final sedimentation basin by gathering the foamed scum generated in an endless aeration water channel and sprinkling water over the scum to defoam the same and treating the defoamed scum in an aeration water channel. CONSTITUTION: A foamed scum treatment apparatus consists of the aerator 4 provided in an endless aeration water channel 1, the scum flow preventing float 5 provided in the downstream water area of the aerator 4 over the entire surface in the lateral direction of the channel and the water sprinkling means 6 for defoaming scum provided to the upstream position of the scrum flow preventing float 5. By this constitution, foamed scum is efficiently gathered to the scum preventing float 5 by the water stream generated in the endless water channel 1 and water is collectively sprinkled over the gathered foamed scum to defoam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam scum processing device for surely processing foam scum generated in an endless aeration channel such as a circular shape or an oval shape.

[0002]

2. Description of the Related Art In the treatment of sewage, a method of introducing sewage into an aeration tank having a circular or oval circulation channel (endless channel) and aerating the sewage while circulating it in the channel is proposed. It has been put to practical use. However, when aeration of sewage, foam scum is generated in the waterway and floats on the water surface. If this scum proliferates and floats on the surface of the waterway, it will be blown off on all four sides by a strong wind and will give off a bad odor. For this reason, the foam scum generated in the water channel is sprayed on the foam scum to defoam.

[0003]

However, in ordinary water treatment equipment, the defoaming ability due to this water spray is limited, and when a large amount of foam scum is generated, it is difficult to defoam all of the foam scum. It was This scum that could not be defoamed overflows from the endless waterway to the final sedimentation pond with the sewage,
The quality of the treated water in this final sedimentation pond is deteriorated and it gives an unpleasant feeling.

It is an object of the present invention to collect the foamed scum generated in the endless water channel, sprinkle and defoam it for treatment in the aeration channel to reliably prevent the foamed scum from flowing out to the final settling basin.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and includes an aerator provided in an endless aeration channel, and a water area downstream of the aerator and upstream of the channel outlet. The gist of the present invention is that the scum baffle float is provided over the entire width direction of the water channel at the position, and the scum defoaming sprinkler is provided at the upstream position of the scum baffle float.

[0006]

[Operation] In the waterway downstream of the aerator installed in the endless aeration waterway, a scum baffle float is provided over the entire widthwise direction of the waterway, and a sprinkler is provided upstream of the scum baffle float. Set up. As a result, the foamed scum is efficiently collected by the baffle float in the water flow generated in the endless water channel, and the collected foamed scum is sprayed intensively to defoam the foamed scum. The defoaming process can be reliably performed in the endless water channel, and the outflow to the final settling basin can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A foam scum treating apparatus according to the present invention will be described below with reference to the embodiments shown in the drawings. In the figure, 1 is an endless water channel of an oxidation ditch with a circular shape or an oval shape as shown in the figure, and this oxidation ditch has a shallower water depth than the standard activated sludge method,
There is an advantage that the area of the aeration tank can be made large, and sewage is supplied from the inflow pit 2 arranged in a part of this endless water channel, and sewage supplied in this channel generates a circulating water flow along the channel. The aerator 4 for stirring and aerating is installed as described above.

This aerator 4 has an oval channel 1 as shown in the figure.
In that case, one or two or more units are installed in parallel on the straight road portion so that a substantially uniform water flow can be obtained over the entire surface in the width direction of the water channel.
The aerator 4 is of a four-screw type and other types as well as the aerator 4 is placed at a certain position.

Reference numeral 3 denotes an outflow pit, which is provided in a part of the endless water channel 1, but is preferably disposed on a diagonal line with the inflow pit 2,
The treated water treated in the oxidation ditch is guided from the channel to the final settling basin (not shown).

A scum baffle float 5 is provided in the endless water channel 1 at the water surface of the water channel and over the entire width direction, and when foamed scum generated in the water channel flows down by the water flow in the water channel. The scum baffle float 5 is blocked so as not to flow to a downstream region below it, and the scum baffle float 5 is set as a downstream region of the aerator 4.

Further, at the upstream position of the scum baffle float 5, one or a plurality of water sprinkling means 6, for example, water sprinkling pipes are arranged in parallel over the width direction of the water channel, and the water sprinkling pipes collect and float on the water surface. Defoaming water is supplied at a water pressure suitable for defoaming the foam scum.

Further, the relative positional relationship between the scum baffle float 5 and the water sprinkling means 6 and the aerator 4 which are arranged in the vicinity of the float 5 is as follows.
It is assumed to be a downstream water channel of the aerator 4 and disposed at a position where fine bubbles float on the water surface when aerating while agitating sewage with the aerator.

Therefore, as compared with the standard activated sludge method, the defoaming sprinkler in the oxidation ditch, which has a shallow water depth and a large aeration area, is generally installed in the immediate downstream side of the aerator where foaming scum is usually generated. However, when the number of actinomycetes, which is the causative agent of foaming scum, reaches about 1 million per 1 ml of the mixed solution, foaming scum formation progresses beyond the defoaming ability, and this unfoamed foaming scum is not fully defoamed and is the final sedimentation pond And the quality of treated water and appearance will be impaired.

According to the present invention, as shown in FIG. 1, a scum baffle float 5 is provided over the entire width of the canal at a position downstream of the aerator upstream of the outflow pit 3 of the endless canal 1 of the oxidation ditch. Therefore, the foamed scum is efficiently collected at this upstream position by the scum blockage float by utilizing the circulation flow in the water channel.

Since the sprinkling means 6 for defoaming is installed at a position above the water surface in the upstream region where the foam scum is collected as described above, the sprinkling of the foam scum is intensively crushed by this sprinkling,
It can be returned to the mixed solution.

At this time, since the ratio of actinomycetes and activated sludge microorganisms is the same in both the foam scum and the mixed solution, the scum foamed by the aerator can be sprayed intensively and returned to the mixed solution again. Is.

[0017]

The apparatus for treating foam scum according to the present invention includes an aerator provided in an endless aeration channel, and a scum shunt float provided over the entire width direction of the channel in the water area downstream from the aerator. Since it is composed of a sprinkling means for defoaming scum provided at the upstream position of the scum baffle float, it efficiently collects the foamed scum and sprinkles water by blocking it without letting it flow to the downstream of the waterway. As a result, the foam scum can be prevented from flowing down to the final settling basin, and the quality of treated water can be improved. The scum baffle float and sprinkler installed in the aeration channel are installed so as to be the zone where foaming scum is generated by the aerator, so that the foaming scum floating on the water surface must be reliably collected and defoamed. There are advantages such as

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an apparatus for treating foamed scum according to the present invention.

FIG. 2 is a longitudinal sectional view of the same.

[Explanation of symbols]

 1 Endless waterway 2 Inflow pit 3 Outflow pit 4 Aerator 5 Blocking float 6 Sprinkling means

Claims (2)

[Claims] 1. An aerator provided in an endless aeration channel, a scum obstruction float provided over the entire widthwise direction of the channel in a water area downstream from the aerator, and an upstream position of the scum obstruction float. An apparatus for treating foam scum, which comprises a sprinkling means for defoaming scum. 2. The treatment apparatus for foamed scum according to claim 1, wherein the scum baffle float and the water sprinkling means arranged in the aeration channel are provided on the downstream side of the aerator and at the upstream position of the channel outlet.