JPH0533808U - Sewage treatment equipment using floating media - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a sewage treatment device in which sewage and aeration air are supplied to the floating filter medium layer from below to easily separate and regenerate contaminants and biofilms. [Structure] The floating filter medium is filled in the closed tank, and sewage and aeration air are fed into the floating filter layer from below, and the filtrate is taken out from the upper part of the closed tank, and further, the bottom part of the closed layer. It is equipped with a stirring blade for the floating filter medium. When removing fine solids and biofilm adhering to the floating filter medium, by rotating the stirring blade, the lower layer of the floating filter medium with the most clogging can be unraveled first, and then the upper layer can be unraveled in order to complete the filter medium. The clogging can be separated and removed by stirring.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a wastewater treatment device using a floating filter medium.

[0002]

[Prior Art]

 Conventionally, as a sewage treatment apparatus using this type of floating filter material, there are Japanese Examined Patent Publication No. 2-226882 and Japanese Examined Patent Publication No. 63-85. Japanese Examined Patent Publication No. 2-22682 is a filter in which a closed tank is filled with a floating filter medium, and sewage is sent to the floating filter medium layer from the lower part and the filtrate is taken out from the top part. In Japanese Examined Patent Publication No. 63-85, a filter material having a specific gravity slightly lighter than that of the stock solution is charged into a closed tank, and the filter material is placed in a sealed tank in a zone that does not pass through the filter material. This is to purify the undiluted solution by flushing sewage and aeration.

[0003]

[Problems to be solved by the device]

 However, the invention of Japanese Patent Publication No. 2-22682 mentioned above is a filter using a flotation filter material that is pushed up by the undiluted solution and is in a compacted state, and cannot be biologically treated. Are in the zone where the particles cannot pass, and among the foreign substances generated here, those that have grown large cannot be separated. Further, in the present invention, the stock solution is an upward flow, but it takes out foreign matter up and down, which makes it difficult to separate and lacks a major function as a filter.

[0004]

[Means for Solving the Problems]

 The present invention, which has the function of a filter, enables biological treatment, and the gist of the invention is to fill a floating filter material in a closed tank and to stir the bottom of the closed tank. A wing and an inlet for raw water are provided, a filtrate extraction pipe is embedded in the upper layer of the floating filter material layer, air diffusers are provided below and in the lower portion of the floating filter material layer, and an air filter is provided on the top of the closed tank. A hole is provided.

[0005]

[Action]

 The device according to the present invention is configured as described above, and while the stock solution supplied from the lower part of the closed tank rises in the floating filter medium layer, the impurities are captured by the filter medium and the filtrate is collected. Can be removed from the extraction tube. At the same time, the undiluted solution is aerated by the air from the lower and lower air diffusing tubes of the floating filter material layer, and the soluble organic substances contained in the undiluted solution are oxidatively decomposed. That is, it is possible to simultaneously perform filtration by a floating filter medium and aerobic biological treatment. As described above, when the filter material layer is clogged with suspended solids or grown biofilm, the stirring blade is rotated to loosen the filter material layer that causes the most clogging, and the floating filter material layer is removed. Can be stirred, and foreign matter such as biofilm separated from the floating filter can be taken out from the lower part of the closed tank. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0006]

【Example】

 In FIG. 1, reference numeral 1 is a closed tank, 2 is a floating filter medium made of expanded polystyrene filled in the closed tank, 3 is a stirring blade of a filter medium provided at the bottom of the closed tank 1, and 4 is a lower layer of the floating filter layer. Air diffusers 5 embedded in the section are air diffusers provided in the lower part of the closed tank 1.

Next, reference numeral 6 is a stock solution supply pipe that opens to the lower bottom of the closed tank 1, and the other end is connected to a stock solution tank 7 via a pump P1. In the circuit of the supply pipe 6 for the undiluted solution, reference symbol P S is a pressure switch, and 8 is a flow meter. Next, reference numeral 9 is a filtrate collecting water pipe buried in the upper part of the floating filter medium layer, which connects the treated water pipe 10 to the treated water tank 11 and opens the manifold 10a to branch the manifold 10a. Is connected to the treated water tank 11 via a backwash pump P2. 10b is a check valve provided in the manifold 10a.

Next, reference numeral 12 is a drain pipe connected to the above-mentioned undiluted solution supply pipe 6, which can be opened and closed with the supply pipe 6 by a drain valve V 1, and at the other end thereof from the treated water pipe 10 A branched drain pipe 10c is connected. Reference numeral V2 is a drain valve provided in the drain pipe 10c, and the drain pipe 10c is for discarding the filtrate mixed with impurities at the initial stage of filtration. Further, in FIG. 1, reference numeral V4 is an air vent valve, M1 is a drive motor for the stirring blade 3, and B1 is a blower. FIG. 2 is an operation time chart of the device according to the present invention, and the reference numerals of the devices are the same as those in FIG.

The apparatus according to the present invention is configured as described above, and the raw water supplied into the closed tank 1 by the supply pipe 6 is aerated by the diffuser pipes 4 and 5 and flows through the floating filter material layer. Ascends, impurities are captured and purified, and are taken out to the treated water tank 11 through the treated water pipe 10. That is, the raw water is simultaneously aerated by the air diffusers 4 and 5 and filtered by the floating filter medium 2. The filtrate is not only separated from impurities, but also biologically treated by the aeration. Therefore, a qualitatively clean filtrate can be obtained.

As described above, when the treatment operation is continued and the filter layer is clogged, the pressure in the closed tank 1 increases. This increase in pressure is detected by the pressure switch PS, and each device operates according to the detection signal to shift from the processing operation to the filter medium cleaning step. Explaining this in detail with reference to FIG. 2, the drive motor M1 is rotated by a signal from the pressure switch PS, and the lower layer of the clogged filter medium layer is unraveled. At this time, the devices and valves other than the air release valve V4 are stopped. (See FIG. 2) Then, after separating the impurities and waiting for the filter medium layer to stand still, the treated water is sent from the water collecting pipe 9 to the floating filter medium layer by the backwash pump P2 to backwash the filter medium. At this time, the drain valve V1 is opened, and the cleaning sludge water containing contaminants and biofilms is discharged to the outside of the system through the drain pipe 12. In the above cleaning operation of the filter medium, according to the present invention, the lower surface of the filter medium layer which is most likely to be clogged in the upward flow is unraveled by the stirring blade 3, so that the filter medium can be completely stirred to separate the contaminants from the filter medium.

When the cleaning of the filter medium is completed as described above, the backwash pump P2 is stopped, the drain valve V1 is closed and the raw water pump P1 is operated to start the processing operation. At the same time, aeration air is supplied by the blower B1 to return to the original operation. However, in order to avoid contamination of the treated water with impurities remaining in the filter layer immediately after washing the filter medium, the initial treated water is Dispose of water. This drainage operation is performed by closing the treated water valve V3 and opening the drainage valve V2 in FIG. The above-mentioned operations for cleaning the filter medium and for treating each device and valve in the wastewater treatment operation are automatically performed based on a predetermined time chart.

[0012]

[Effect of the device]

 As described above, the device according to the present invention does not require any labor for installation using an extremely lightweight floating filter medium and for cleaning and reprocessing the filter medium. The biological treatment of sewage by separation and aeration can be performed at the same time, and even qualitative treatment of sewage is possible, and the profits obtained from sewage treatment are enormous.

[Brief description of drawings]

FIG. 1 is a flow sheet of a wastewater treatment apparatus according to the present invention.

FIG. 2 is an operation time chart of the sewage treatment apparatus according to the present invention.

[Explanation of symbols]

 1 Closed tank 2 Floating filter medium 3 Stirring blades 4, 5 Diffuser pipe 9 Water collecting pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C02F 3/08 B 6647-4D 3/10 A 6647-4D

Claims (1)

[Scope of utility model registration request] 1. A closed tank 1 is filled with a floating filter medium 2, a stirring blade 3 and an inlet for raw water are provided at the bottom of the closed tank 1, and a filtrate collecting pipe 9 is provided above the floating filter layer.
Embedded in the air diffusion tube 4, below the floating filter layer and in the lower layer.
5, a treatment apparatus for sewage using a floating filter medium, further comprising an air vent hole at the top of the closed tank 1.