JPS6323928Y2 - - Google Patents

Description

[Detailed explanation of the idea] "Purpose of invention" (Technical field of invention) The present invention relates to a sewage filtration device.

(Prior art and its problems) Some conventional sewage filtration devices include a filter tank buried underground and filter media stacked inside the filter tank. The filter tank is provided with a manhole that opens to the ground surface, and a worker enters and exits through the manhole when performing maintenance. Sand and gravel are used as the filter media in the filter tank, and the sand is layered on top of the gravel.

Such conventional sewage filtration equipment filters sewage introduced into a filtration tank using a filter material to remove dirt, sludge, and other fine-grained impurities from the sewage, but as time passes, Large particles of dirt and sludge adhere to and remain on the top layer of the filter material, that is, the top surface of the sand layer. However, if the amount of dirt and sludge remaining on the top surface of the sand layer increases due to long-term use of the sewage filtration device, the filtration capacity will decrease, so it is necessary to perform regular maintenance to remove the dirt and sludge on the top surface of the sand layer. be. Removal of garbage and sludge is carried out as follows. That is, a worker enters the filtration tank, digs up the sand along with dirt and sludge, carries it out of the filtration tank, and then either washes the sand and returns it or replaces it with new sand.

As mentioned above, in conventional sewage filtration equipment, when removing dust and sludge remaining on the uppermost layer of the filter material during maintenance, the work from carrying out the sand that is the filter material to washing and carrying it in is necessary. Since most of the processes are done manually, the work is time-consuming and maintenance costs are high.

(Technical problem to be solved by the invention) The technical problem to be solved by the invention is that the top layer of the filtration material in the filtration tank is easily removed from the filtration tank and carried into the filtration tank. To provide a filtering means which can easily remove attached dust and sludge and can be used repeatedly.

"Structure of the invention" (Technical means for solving technical problems) The measures taken by this invention to solve the above problems are:
A filter mat divided into many pieces is removably laid on the top layer of filter media stacked in a filter tank.

(Operation of the technical means) According to the above means, the wastewater introduced into the filter tank is filtered by the filter mat in the uppermost layer of the filter material, and the dirt and sludge in the waste water adhere to the filter mat and remain. During maintenance, the filter mat with dirt and sludge attached to it is peeled off and carried out from the filtration tank, and after the mat is washed with water to remove dirt and sludge, it is carried into the filtration tank and laid back in its original position. It will be used again.

"Effects of the invention" According to the structure of the invention as described above, the filtration mat in the uppermost layer of the filtration material is divided into many pieces, making it easy to carry and transporting from and to the filtration tank. It is easy to carry in, and by removing the filter mats with dirt and sludge from the filtration tank, you can easily remove the dirt and sludge, and the filter mats that have been taken out can be washed with water to remove the dirt and sludge that have stuck to them. Because it can be easily removed and reused, it is easier to maintain and reduces maintenance costs compared to the conventional method of cleaning and replacing the sand that is the filter medium. In particular, when dirt or sludge remains only partially, it is only necessary to peel off the filter mat in the remaining part and carry it out, which is excellent in workability.

``Example'' An example of the present invention will be described below with reference to the drawings.

In the sewage filtration apparatus of this embodiment, as shown in FIGS. 1 and 2, filter mats m are removably spread over the top layer of filter media stacked in a filtration tank A.

The filtration tank A is made of waterproof concrete and is buried underground, has a manhole 1 that opens to the ground surface, and has a water intake pipe 2 inserted into the side wall.

The water intake pipe 2 opens facing a storage tank 3 partitioned through a partition wall 3a in the filtration tank A,
Sewage is supplied into the storage tank 3.

The storage tank 3 is provided offset to one side of the bottom of the filtration tank A, and the wastewater overflows from the storage tank 3 and the filtration function part of the filtration tank A adjacent to the partition wall 3a, that is, the filter material is laminated. It is now flowing to the lower part of the body.

The filter media consists of gravel layer A and sand layer B from the lower layer to the upper layer.
A space 5 is formed between the sand layer a and the bottom surface of the filtration tank A with a grating 4 interposed therebetween.

The space 5 is communicated with the outside of the filtration tank A, for example, another treatment tank (not shown), via a drain pipe 6, and the filtered water accumulated in the space 5 passes through the drain pipe 6 and is transferred to the other treatment tank. It is now being sent to

The filter mat m spread over the uppermost layer of the filter material, that is, the upper surface of the sand layer b, is made of fiber and is divided into a large number of pieces, and can be used singly or in a plurality of layers. The shape of one filtration mat is rectangular or square, and the maximum length of one side is about 30 cm to 50 cm so that it can be easily held in the hand.

In the sewage filtration device of this embodiment as described above, sewage is introduced into the filtration tank A through the intake pipe 2 and the storage tank 3, and the sewage is filtered through the filtration pine m, the sand layer b, and the gravel layer a. The water is collected as filtered water in a space 5 below the gravel layer a, and is sent to another treatment tank via a drain pipe 6.

When a sewage filtration device is used for a long period of time, dirt and sludge in the sewage adhere to and remain on the filtration mat m. During maintenance of the sewage filtration system, a worker enters the filtration tank A from the manhole 1 through the ladder 7, peels off the filtration mat m covered with dirt and sludge, and carries it out of the filtration tank A. Then, the filter mat m that has been carried out is washed with water or the like to remove dust and sludge.

Thereafter, the washed filter mat m is carried into the filter tank A, laid down again in its original position, and used again.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing one embodiment of the sewage filtration apparatus of the present invention, and FIG. 2 is a sectional view taken along the line -- in FIG. In the figure, A...filter tank, a...gravel layer of filter material, b...sand layer of filter material, m...filter mat.

Claims (1)

[Scope of utility model registration request] A sewage filtration device in which a number of separated filter mats are removably laid on the top layer of filter media stacked in a filtration tank.