JPS624165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filtration device for removing particulate matter suspended in a fluid.

Conventionally, as a filtration device in sewage treatment, a sand filtration device, an activated carbon filtration device, etc. have been generally used. Furthermore, activated sludge method has generally been used as a method for purifying organic wastewater.

However, sand filtration equipment and activated carbon filtration equipment used in sewage treatment have drawbacks such as difficult backwashing, easy clogging, inability to operate for long periods of time, and high maintenance costs. In addition, in the activated sludge method for organic wastewater, organic particles are adsorbed onto activated sludge flocs, oxidized and decomposed, led to a settling tank, where the flocs settle and the supernatant liquid is discharged as purified water. Digestion of organic particles in the oxidative decomposition tank is not constant due to changes in organic load and inflow rate over time, and the particle size and specific gravity of the flocs change, resulting in different sedimentation rates even with the same particle size, and It has the disadvantage that the residence time cannot be kept constant, and the sedimentation rate of substances with small particle sizes of 40μ or less is very slow, so it is practically difficult to separate them from the supernatant liquid, and they are discharged without being separated. In order to remove these fine particles, it is necessary to stay in the sedimentation tank for a long time, which requires a large area and a large sedimentation tank, which requires a huge amount of equipment and management costs, so it is not an economical method. Good and difficult.

Therefore, although using this treated water as gray water is an effective means of resolving water shortages, it has not been possible to purify it sufficiently at a low cost, so it has been discharged into rivers. is the reality.

The present invention has been made in view of the above points, and its purpose is to pass wastewater from the outside to the inside of a filtration device in which a plurality of filter elements with different outer diameters and slit intervals are arranged concentrically. By doing this, particulate matter suspended in wastewater is removed step by step by each filter element in order of particle size, and the load on each filter element is averaged, and backwashing allows long-term operation. The point is that water treatment can be carried out efficiently by making it possible. Another purpose is to provide small and inexpensive filtration equipment that does not require huge areas and facilities such as sedimentation tanks, thereby reducing water treatment costs and making it possible to reuse water. .

The invention will be explained below with reference to the drawings.

FIG. 1A is a perspective view showing an example of a perforated polygonal metal tube core of a filter element constituting the filtration device of the present invention, in which liquid passage holes 2 are bored on each side of the hexagonal metal tube core 1. Preferably, each side surface is distorted inward to form a curved surface 3. The core body 1 is not limited to a hexagonal metal tube, but may be any polygonal metal tube having a triangular shape or more. FIGS. 1B and 1C are a perspective view and a partially enlarged cross-sectional view of the filter element 5, in which filter wires 4 are attached to the outer peripheral surface of the perforated polygonal metal tube core 1.
is space-wound so that the slit interval d is constant, and a space is formed between the core body 1 and the filter wire 4 by the curved surface 3, which improves the flow of liquid.

FIGS. 2A and 2B are a perspective view and a side view of the filtration device 6 of the present invention, in which the filter elements 5 and 5 have a perforated polygonal metal tube core 1 in FIG.
A plurality of filter elements 5' and 5'' are arranged concentrically from the outside to the inside, and assembled so as to maintain a gap between each filter element. At this time, the slit interval d of each filter element is a perforated polygonal metal tube. It is necessary that the core body 1 is designed to be gradually narrower as the outer diameter of the core body 1 increases.

Sewage flows in from the direction of arrow 7, is filtered by each filter element 5, 5', and 5'', and purified water flows out in the direction of arrow 8. In this case, the outermost filter element 5 is placed in a sedimentation tank, for example. Particulate matter with a diameter of 50 to 100μ, which has a relatively slow sedimentation rate, is removed from the supernatant liquid obtained by sedimentation and separation of particulate matter with a diameter of 100μ or more and a fast sedimentation rate in a short period of time. The middle filter element 5' separates particulate matter with a particle size of about 20 to 50 μm contained in the filtrate that has passed through the outermost filter element 5, and therefore reduces the load on water discharged into the river. The organic matter load is reduced and the water quality is always stable.The filtrate that has passed through the middle filter element 5' has a particle size of 3" in the inner layer filter element 5".
Particulate matter of ~20 microns is removed, and the filtrate that passes through this is supplied as gray water. Note that the number of filter elements 5, 5', 5'' is not limited to three layers, and can be increased or decreased as necessary.

FIG. 3 shows a system diagram of a filtration facility equipped with the filtration device 6 of the present invention. Reference numerals 1 to 8 represent the same parts as in FIG. 9 is the outer wall of the filtration equipment; 1
0 is a sedimentation tank, 11 is sewage, 12 is a sewage wave pump, 13 is a sewage intake valve, 14 is a discharge water outlet valve, 15 is a gray water water outlet valve, 16 is a compressed air intake valve for backwashing , 17 indicate sludge outlet valves, respectively. First, sewage treated in the activated sludge tank is led to the settling tank 10, where large flocs of 100μ or more are settled, and the supernatant liquid is pumped into the sedimentation tank 10.
The waves are raised and sent into the filtering device 6 . The waste water is filtered by each filter element 5, 5', 5''. The filtrate that has passed through the inner layer filter element 5'' is supplied as gray water water through a gray water outlet valve 15, and is also separated here. The water passes through the discharge water outlet valve 14 and becomes discharge water. When each filter element becomes clogged, compressed air is introduced through the backwashing compressed air intake valve 16 to blow away particulate matter stuck in the filter wires 4, 4', 4'' and perform backwashing. The sludge at that time is taken out from the sludge outlet valve 17.

As described above, the filtration device of the present invention has a feature that it can be operated continuously for a long time by repeating filtration and backwashing, and has a very large economic effect.

Examples of the present invention will be described below.

Example A wire diameter of 0.6 with a Bitkers hardness of 160 was placed on the outer periphery of a perforated hexagonal stainless steel tube with a diagonal of 24.0 mm and a wall thickness of 0.6 mm.
The outermost filter element 5 was manufactured by winding stainless steel wire of mmφ so that the slits had a constant interval of 50 μm. Similarly, the diagonal is 18.0mm and the wall thickness is 0.6
A 0.6 mm stainless steel wire is wound around the outer periphery of a perforated hexagonal stainless steel tube with a slit interval of 20 μ to form an intermediate filter element 5', with a diagonal of 12.0 mm and a wall thickness.
A 0.6 mm stainless steel wire was wound around the outer periphery of a 0.6 mm perforated hexagonal stainless steel tube with a slit interval of 5 μ to produce an inner layer filter element 5''. The filtration device of the present invention was constructed by arranging concentrically inward in stages.The suspended particulate matter concentration in the sedimentation tank was
The supernatant liquid of 250 ppm is sent to the filtration equipment equipped with the above filtration device, and after filtering, the discharge water outlet valve 14
Treated water for discharge with a suspended particulate matter concentration of 3.2 ppm was obtained from the outlet valve 15, and treated water with a suspended particulate matter concentration of 0.8 ppm was obtained from the water outlet valve 15. I was able to get it efficiently.

As explained above, the filtration device of the present invention has a plurality of filter elements having different outer diameters and slit intervals arranged concentrically to allow wastewater to pass through it, so it is small and has low equipment costs. It has a high purification ability and a large treatment capacity, making it possible to reduce treatment costs and promote water reuse. In addition, the treated water by the activated sludge treatment method for organic wastewater can be further purified to efficiently reduce the organic matter load in rivers. In addition, clogged filter elements can be easily blown away by backwashing, making continuous operation possible for long periods of time.

[Brief explanation of the drawing]

FIG. 1A is a perspective view of a perforated polygonal metal tube core of a filter element constituting the filtration device of the present invention, and FIGS. 1B and 1C are a perspective view and a partially enlarged sectional view of the filter element. FIGS. 2A and 2B are a perspective view and a side view of the filtration device of the present invention. FIG. 3 is a system diagram of filtration equipment equipped with the filtration device of the present invention. 1, 1', 1''...Perforated polygonal metal tube core, 2...Filtering passage hole, 3...Round curved surface, 4, 4', 4''...Filter wire, 5, 5', 5''...Filter element, 6 ...filtration device, 9...outer wall, 10...sedimentation tank, 11...sewage, 12...pump, 13...sewage intake valve, 14
...Discharge water outlet valve, 15...Water outlet valve for middle water supply, 16...Compressed air intake valve for backwashing, 17...
Sludge outlet valve.

Claims (1)

[Claims] 1 Each side surface of a polygonal metal tube is distorted inward to form a curved surface, and a perforated polygonal metal tube core with liquid passage holes is formed on the core body, and an arbitrary slit interval is maintained to form a filter. A plurality of filter elements formed by winding a wire are arranged concentrically from the outside to the inside in order of the outer diameter of each filter element and the size of the slit interval so as to maintain a gap between each filter element. A filtration device characterized by being arranged and assembled.