JPH0113599Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" This invention relates to a wastewater treatment device, particularly a compact wastewater treatment device that can be used as a gray water generation device.

``Conventional technology'' In recent years, large buildings being constructed in large cities are beginning to introduce gray water systems based on social demands such as energy conservation.

These gray water systems treat gray water and use it for flush toilets, car washes, watering, air conditioning equipment, etc., but especially when installed in buildings etc., they are small and have low treatment performance. A wastewater treatment system that is expensive and easy to maintain is required.

A wastewater treatment device that meets these demands is an aeration filtration type device that integrates standard activated sludge treatment and filtration functions.In other words, it is a treatment tank that combines the above two functions in one tank, with the upper part This is a microbial breeding retention area for performing biological treatments such as sludge treatment and biofilm method, and the lower part is a two-dimensional microbial breeding retention area and a filtration layer that filters the above-mentioned treated wastewater. For example, Japanese Patent Publication No. 56-14360 and Japanese Patent Application Laid-Open No. 57-48388 have proposed a device that has a smaller installation area, that is, can be constructed in a smaller size than a device arranged in the same place.

On the other hand, if high-concentration oxygen is used to supply oxygen to the microorganism breeding and retention area comprised in the aeration section for biological treatment of activated sludge and biofilm, the oxygen absorption efficiency of activated sludge will increase and the biological treatment capacity will increase. It is known that the area occupied by the filtration layer can be reduced because activated sludge with improved solid-liquid separation performance is formed, but this method increases costs. There is no example of this being incorporated into the aforementioned wastewater treatment equipment for the municipal water supply system.

``Problems that the invention seeks to solve'' As mentioned above, it is necessary to eliminate high costs in order to incorporate a high-concentration oxygen injection method that has clearly advantageous effects such as improving biological treatment capacity and forming activated sludge with good solid-liquid separation performance. Effective utilization of the available oxygen must be achieved.

``Means for solving problems'' and ``effects'' This proposal was created in view of the circumstances described above, and its gist is that an aerated filtration treatment tank that integrates activated sludge treatment and filtration functions. The tank is constructed as a closed tank with a canopy and is divided into three tanks with vertical bulkheads.
A communication port between adjacent tanks is provided in the upper gas section and lower liquid section of the longitudinal bulkhead, and a raw water supply pipe and a high concentration oxygen-containing air supply pipe are installed in the first tank canopy, and a third A gas collection crown is shaped on the tank canopy, and a gas collection pipe with a circulation blower is installed in the crown, and the end of the gas collection pipe is used not only for exhaust, but also as a diffuser pipe for aeration of each tank and for air washing. The gas collecting section includes an oxygen concentration meter and an oxygen concentration meter for injecting high-concentration oxygen-containing air into the first tank when the concentration falls below a set value and stopping the injection when the concentration exceeds the set value. A pressure gauge will be installed to inject high-concentration oxygen-containing air when the temperature drops below the set value, and stop the discharge when the temperature drops below the set value. The aim is to reduce the number of installations and reduce power costs.

"Example" This will be explained in detail below based on the figures.

Fig. 1 is an explanatory diagram of the configuration of the proposed device. In the figure, 1 is a closed tank with a canopy.
It is divided into three tanks, a second tank 5 and a third tank 6.

The vertical partition walls 2 and 3 are provided with communication ports 2a, 2b, 3a and 3b between the upper gas section and the lower liquid section.

The first tank 4 incorporates a raw water supply pipe 7 and a high concentration oxygen-containing air supply pipe 8.

A gas collection crown 9 is formed on the roof of the third tank 6, into which a gas collection pipe 11 having a circulation blower 10 is assembled.

The gas collecting pipe 11 has an exhaust gas 12 at the end thereof, and also branches into an aeration diffuser pipe 13 for each tank and an air washing diffuser pipe 14.

The gas collecting section includes an oxygen concentration meter 15 that injects high-concentration oxygen-containing air into the first tank 4 when the concentration falls below a set value, and stops the injection when the set concentration is exceeded, and an oxygen concentration meter 15 that injects high-concentration oxygen-containing air into the first tank 4 when the set concentration is exceeded. A pressure gauge 16 is installed to stop the discharge when the contained air is injected and becomes below a set value.

In the figure, 17 is a water collection pipe, 18 is a treatment water pipe, and 19 is a water collection pipe.
is a backwash water pipe, and V is an operation valve for each pipe.

Therefore, in the present device configured as described above, raw water is first injected into the first tank 4, and is aerated with fresh high-concentration oxygen-containing air to increase the reaction rate, so that it can be efficiently carried out in a short time. Contaminant organic substances are decomposed.

Air washing is also performed by the circulation blower 10 at this time.

Therefore, the surplus air in all the tanks is reused for aeration and air washing, so oxygen is effectively used.

Since aeration reduces the organic matter content in the order of the first tank 4, second tank 5, and third tank 6, the valve control of each tank should be set to suit the BOD load of each tank. .

Further, in the present invention, aeration and air washing are performed by a single blower 10, so the blower equipment cost is reduced and control becomes simple.

The device of this invention is suitable when the BOD concentration of raw water is 100 mg/or less.

``Effects of the invention'' As described above, according to the present invention, high concentration oxygen can be used effectively and the high cost thereof can be eliminated, and the number of blowers is not required and power costs can be expected to be reduced. Demonstrates high performance.

Since the contaminant organic matter in the raw water is sufficiently treated before proceeding to filtration, the negative BOD to the filtration layer is reduced, resulting in stable and high-quality treated water.

Even if the raw water BOD concentration increases, the reaction rate of microorganisms can be increased by supplying high-purity oxygen commensurate with the high BOD concentration, so the aquarium can be made more compact.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of the present device. Explanation of symbols: 1...Occupied tank, 2, 3...Vertical bulkhead, 2a, 2b, 3a, 3b...Communication port, 4...
1st tank, 5...2nd tank, 6...3rd tank, 7...raw water supply pipe, 8...high concentration oxygen-containing air supply pipe, 9
... Gas collection crown, 10 ... Circulation blower, 11
... Gas collection pipe, 12 ... Exhaust, 13 ... Diffusion pipe for aeration, 14 ... Diffusion pipe for air washing, 15 ... Oxygen concentration type, 16 ... Pressure gauge, 17 ... Water collection pipe, 18 ...
...Treatment water pipe, 19...Backwash water pipe, V...Operation valve.

Claims (1)

[Scope of utility model registration request] The aeration filtration treatment tank, which integrates activated sludge treatment and filtration functions, is configured as a closed tank with a canopy and is divided into three tanks by vertical partition walls, with the upper gas section and lower liquid section of the longitudinal partition wall adjacent to each other. A communication port is bored between the tanks, and a raw water supply pipe and a high concentration oxygen-containing air supply pipe are incorporated into the first tank canopy, while a gas collection crown is shaped into the third tank canopy, incorporating a gas collection tube with a circulation blower in the crown;
In addition to exhaust gas, the end of the gas collection pipe is configured to branch into aeration diffuser pipes and air washing diffuser pipes for each tank, and on the other hand,
The gas collecting section is equipped with an oxygen concentration meter that injects high-concentration oxygen-containing air into the first tank when the concentration falls below a set value and stops the injection when the set concentration is exceeded. A wastewater treatment device characterized in that a pressure gauge is installed to inject water and stop the discharge when the pressure falls below a set value.