JP2547290Y2 - Wastewater treatment equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus for biologically filtering water to be treated such as wastewater containing organic substances or nitrogen components.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional wastewater treatment apparatus, in which 1 is a tank having a circular or rectangular cross section.
2b is a layer of the filter medium b having a specific gravity larger than 1.0, 3 is waste water (water to be treated), 4 is a backwash blower for sending backwash gas, and 5
Is an aeration blower for supplying oxygen to the filter medium b, 6 is a backwash pump for sending backwash water, 7 is a backwash drain tank, and 8 is a treated water tank. A biofilter for removing organic matter contained in water to be treated such as wastewater has a specific gravity of 1.
A filter medium b larger than 0, such as ceramic,
The organic matter in the wastewater 3 is biologically decomposed and removed by the action of the microbial membrane deposited on the filter medium b by allowing the wastewater 3 to flow in from above and disposed on the inner partition plate 9.

[0003] However, if the treatment of the wastewater 3 is continued, the microorganisms will enlarge and the suspended solids in the wastewater 3 will accumulate.
The layer 2b of the filter medium b is clogged, and a predetermined amount of water cannot be secured. ing.

Next, the operation will be described. The highest level of the wastewater 3 is HWL, and the lowest level is LWL. Water level is LWL
From HWL to HWL, and when HWL is reached, the layer 2b of the filter medium b
A backwashing blower 4 and a backwashing pump 6 flow backwash gas from the lower portion of the filter medium b, thereby performing a so-called washing operation for eliminating clogging of the layer 2b of the filter medium b.

[0005]

Since the conventional wastewater treatment apparatus is constructed as described above, a considerably large flow rate is required to smoothly fluidize the filter medium layer when washing the layer 2b of the filter medium b. Requires water and / or air and consumes significant power. Therefore, there is a limit to the thickness of the layer of the filter medium b. Therefore, 1) the water depth is low and the oxygen dissolving efficiency by aeration is low, 2) the filtration speed is slow, 3) the treatment duration is short, and 4) high-concentration wastewater is discharged. There were issues such as inability to respond.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a wastewater treatment apparatus capable of improving the processing performance, reducing the power required for cleaning, and reducing the size of the apparatus itself. With the goal.

[0007]

The wastewater treatment apparatus according to the present invention has a specific gravity of less than 1.0, a layer floating in the water to be treated, and a specific gravity of more than 1.0. The filter medium was separated into two layers of filter medium tanks to be formed, and the upper filter medium and the lower filter medium were never mixed by a partition plate.

In addition, a partition plate through which the lower filter medium does not pass is disposed on the whole or part of the tank side between the two divided filter media layers, and the wastewater passing through the partition plate flows into the backwash drain tank. It has a mouth and a drain valve for opening and closing the drain.

[0009]

The wastewater treatment apparatus according to the present invention can efficiently and efficiently filter particularly high-concentration wastewater in a large amount, so that the filtration process is fast and the duration is long.

[0010] To clean the upper filter medium, open the drain port,
It is possible only by draining water.
Can be performed with drainage of wastewater from upper filter media

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The description of the same parts as those of the conventional apparatus will be omitted. In FIG. 1, 2a is a layer of a filter medium a having a specific gravity of less than 1.0, 2b is a layer of a filter medium b having a specific gravity of more than 1.0, and a layer 2a of the filter medium a is supported by a partition plate A (9a). The layer 2b of the filter medium b is supported by the partition plate B (9b). The filter medium a and the filter medium b are never mixed by the partition plate A (9a). 9c is located above the upper surface of the layer 2b of the filter medium b and below the partition plate A (9a), is disposed on the tank side surface or partially, and allows water to pass through and does not pass through the filter medium b. The partition plate C having a porous structure and the partition plate 10 are
A drain port 11 for draining the drain water passing through (9c) into the backwash drain tank 7 is a drain valve for opening and closing the drain port 10. During operation, the water level ranges X and Y where the minimum water level LWL of the wastewater is lower than the upper surface of the tank 2a of the filter medium a, and the water level is increased, and the tank 2a of the filter medium a is already at the minimum water level LWL.
Water level range Z in which the lower surface of the surface floats from the partition plate A (9a)
The water level is adjusted arbitrarily by a water level adjusting gate 12 provided in the treated water tank 8 so that the operation can be performed within the range of the above.

Next, the operation will be described. Washing of only the filter medium a can be performed only by opening the drain valve 11 and draining water by providing the partition plate A (9a).

In the washing of the filter medium b, a backwash gas from the backwash blower 4 is sent out from the lower portion of the layer 2b of the filter medium b for a certain period of time, and then backwash water from the backwash pump 6 flows together with the backwash gas. After overlapping for a certain period of time, the delivery of the backwash gas is stopped and only the backwash water flows. That is, there are 1) a backwash gas sending step, 2) a backwash gas / backwash water flow step, and 3) a backwash water inflow step. During the entire process, the drain valve 11 is kept open.

As described above, the power for backwash water / backwash gas for washing only needs to be for the filter medium b, and two layers of the filter medium (since the filter medium a is floating, (Wide range of water level is wide), the water depth is deep, the oxygen dissolving efficiency by aeration is high, the filtration speed is high, and the treatment duration is long.

[0015]

As described above, according to the present invention, the layer 2a of the filter medium a and the layer 2b of the lower filter medium b floated in the water to be treated.
Since the filter medium a and the filter medium b are never mixed by the partition plate, the water depth can be increased, the oxygen dissolving efficiency by aeration is high, and the filtration speed is high. Further, there is an effect that the processing continuation time can be lengthened and the processing performance can be improved.

Further, by providing a partition plate and a drain port through which the filter medium b does not pass between the two layers of the filter medium, the filter medium a can be washed.
It is possible only by opening the drain port and draining water. Power for backwash water and backwash gas for the filter medium a for cleaning is unnecessary, and the effect of power saving compared with the processing capacity is achieved. is there.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a wastewater treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional wastewater treatment device.

[Explanation of symbols]

 Reference Signs List 1 tank 2b layer of filter medium b 3 wastewater (water to be treated) 7 backwash drainage tank 9a partition plate A 9b partition plate B 9c partition plate C 10 drain port 11 drain valve

Claims (2)

(57) [Scope of request for utility model registration] 1. A filter medium on which microorganisms have formed on its surface is filled in a tank 1, a filter medium layer is formed, and water to be treated flows into the filter medium layer, and the water to be treated is biologically separated. In the wastewater treatment apparatus for filtering, the specific gravity is smaller than 1.0, the filter medium a which floats in the water to be treated and forms an upper layer, and the specific gravity is larger than 1.0, and A wastewater treatment apparatus comprising: a filter medium b supported by a partition plate B to form a lower layer; and a partition plate A that partitions the filter medium a and the filter medium b and through which water and air pass. 2. A porous member which is located above the upper surface of the layer of the filter medium b and below the partition plate A, and is disposed entirely or partially on the side of the tank, and allows water to pass therethrough and does not allow the filter medium b to pass therethrough. Plate C having a conventional structure, a drain port for draining the drain water passing through the partition plate C to the backwash drain tank 7, and a drain valve for opening and closing the drain port. The wastewater treatment device according to claim 1.