JPS6229083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clarification device, particularly a continuous filtration device, equipped with a porous, water-permeable material such as cloth as a filtration surface for purifying treated water such as sewage sludge or activated sludge, and other sewage. It is something.

There are various types of continuous clarification devices that have been used to purify wastewater, but they have problems in terms of processing efficiency and device configuration, and in order to enable continuous filtration, the device configuration must be complicated or large. It has not become widely popular due to difficulties and other reasons. For example, a micro strainer is conventionally known as a continuous filtration device using a net or cloth, but this micro strainer has the following drawbacks.

In other words, a net is placed around the drum, most of which is submerged in water and a portion of which is exposed to the atmosphere, and raw water is supplied to the inside of the drum while rotating, and the water is passed outward. Bearings and sealing mechanisms are indispensable and prone to failure, and when a large amount of raw water is to be processed, the excess surface area increases, resulting in an extremely large drum diameter. The major drawback was that the space could not be used effectively and it was impossible to make it more compact.

Moreover, it takes a considerable amount of tension to stretch the mesh around the drum without sagging, so strong materials such as stainless steel wire mesh must be used, and fabrics are difficult to use, making the manufacturing cost extremely high. I was getting used to it.

The present invention solves these conventional problems by:
The object of the present invention is to provide an effective continuous clarification device that has a simple configuration and exhibits stable processing performance.

The present invention eliminates the disadvantages of conventional micro strainers by using a water-permeable material such as cloth as the filtration surface and by providing a unique cleaning mechanism that can continuously clean the filtration surface. The present invention is characterized in that it is a device that can realize this. In particular, in order to make effective use of the vertical cross section of the treatment layer, a net or cloth is stretched and fixed on the vertical cross section, and the surface cleaning section is installed so that it can run along the surface, which is different from conventional micro strainers. Its distinctive feature is that it is based on completely opposite ideas.

More specifically, a porous water-permeable body 2 such as cloth or net is stretched over a substantially vertical cross-section inside the treatment tank 1, and one side of the treatment tank 1 is partitioned with the porous water-permeable body 2 in between. is the raw water inlet 3 and the other is the overtreated water outlet 4, and the raw water inlet 3 is connected to the raw water inlet pipe 5,
A treated water outflow pipe 6 is provided in the overtreated water outflow section 4, and a surface cleaning section 8 is provided close to the surface of the porous water permeable body 2 on the side of the inflow section 3 to generate a suction water flow by a pump 7. This clarification device is characterized in that a cleaning section 8 is movably disposed along the surface of the porous water permeable body 2, and water discharged from the pump 7 is discharged as surface cleaning wastewater.

As shown in FIG. 1, the cleaning section 8 is mounted on the traveling carriage 20 so as to move along the surface by using a member having an opening at a position facing the surface, such as a trough-like, perforated pipe, or slit pipe. It is connected to the pump 7 via piping 18. Although this cleaning section 8 is provided on the inflow section 3 side, it can be placed on the outflow section 4 side if necessary.
In some cases, a cleaning section 9 having a configuration similar to that of the cleaning section 8 may be provided opposite to the cleaning section 8 to remove the discharge pipe 1 of the pump 17.
9 so that the suction water flow and the discharge pressure water flow of both pumps 7 and 17 can be used to clean the surface, or the cleaning section 9 alone may perform the cleaning action.

In addition, if the cleaning part 9 by pressurized water discharge is integrated with the pump 17 in close proximity to the surface of the porous water permeable body 2 on the side of the outflow part 4 of the treated water in the treatment tank 1, so as to be movable along the surface. Even more effective surface cleaning can be achieved by dividing the processing tank 1 into a plurality of chambers by a plurality of partition walls 10 as shown in FIG. This configuration is also reasonable, since if the vertical cross section of the processing tank 1 is provided with a filter section, the vertical cross section of the processing tank 1 can be used extremely effectively. In this case, the porous water permeable body 2, the cleaning section 8, the raw water inflow pipe 5, and the treated water outflow pipe 6 are provided in each room.

In the specific example shown in FIG. 4, the treated water outflow section 4 is arranged on both sides or more surfaces of the raw water inflow section 3, for example, on three sides, four sides, or more. Washing sections 8, 8, .

In the specific example shown in Figs. 5 and 6, the oversurface 2 is arranged in a cylindrical shape, and the outflow section 4 is formed inside the oversurface 2, and the inflow section 3 is formed on the outside, and cleaning is carried out close to the oversurface. The part 8 is designed to be able to pivot. Note that the discharge pipe 12 of the pump 7 is configured to allow the washing wastewater from the surface to flow into the washing wastewater tank 11.
In some cases, part or all of the washing waste water may be circulated back to the inlet 3 with or without an aeration section (not shown). Further, the suction pipe 21 of the pump 17 is opened and communicated with the outflow portion 4 so that the treated water can be recycled, but it is also possible to use other water sources as desired.

In the figure, 23 is a wheel, and 24 is a mud removal pipe, which are provided as necessary. 25 is a flow control valve, and 26 is a sludge drainage valve.

The porous water-permeable body 2 may be made of a porous plate or cloth (pile woven fabric) with piles of about 1 to 6 cm, in addition to cloth or a net-like structure, and the mesh size is actually 0.1 to 6 cm. A material of about 5 mm is suitable and can be used in place of a perforated plate or lattice member.
It is also possible to arrange a rubbing member so as to be located corresponding to the cleaning section 8 on a surface along the surface. Furthermore, the movable cleaning sections 8 and 9 may be provided with a member such as a brush, etc., or a blade or a protruding piece for scrubbing the surface, if necessary, to assist in cleaning the surface. 8 and 9 are not limited to straight gutter members, but any cross-shaped or curved gutter members can be selected.

Further, the water flow for suctioning the cleaning waste water does not necessarily have to be generated all the time, but can be controlled by intermittently starting a pump or opening/closing a valve.

In the embodiment shown in Fig. 3, the permeability of the surface can be the same or different to optimize the SS catching ability, and it is not limited to cross flow, from the outer periphery to the center or from the center to the outer periphery. A configuration corresponding to a type that allows raw water to flow through is also considered.

In the embodiments shown in FIG. 4 and FIGS. 5 and 6, the cylindrical porous water-permeable body 2 may be rotatable as required.

The raw water flows into the inflow part 3 in the treatment tank 1 from the raw water inflow pipe 5, and is passed through the filter surface in which the porous water-permeable body 2, such as a filter or net, is expanded, and the clarified filtrate is converted into treated water. The treated water flows out of the system through the outflow section 4 and out of the outflow pipe 6. This overpressure corresponds to the water level difference between the raw water inlet 3 and the treated water outlet 4. In order to prevent the progression of clogging of the surface of the porous water-permeable body 2 due to this overwork, a surface cleaning section 8 using a draft water flow and/or a surface cleaning section 9 using pressure water are installed close to the surface using pumps 7 and 7, respectively. , 17 and moves along the surface by an arbitrary drive machine (the illustrated example runs on a rail) to constantly clean a part of the surface, so that clogging progresses. This allows for continuous over-operation without any problems.

Furthermore, in order to make effective use of the enormous vertical cross-sectional area of the processing tank 1 (if we assume that the oversurface is arranged without any gaps, the oversurface area approaches infinity), the inside of the processing tank 1 is divided into a plurality of openings 10. partitioned by
This is very effective because each section can be increased by the number of sections corresponding to the over area.

The present invention provides a movable cleaning section for generating water flow using a pump along the surface of a porous water-permeable body stretched in a treatment tank, and continuously removes SS trapped on the surface of the water-permeable body. Since it is equipped with a mechanism for cleaning raw water with a high SS concentration, it can be easily cleaned without causing a sudden increase in overresistance, and the vertical section of the treatment tank can be used extremely effectively to clean the oversurface. Therefore, it is possible to obtain an overarea equivalent to that of a conventional micro strainer with a much more compact device.

For example, if an excess area of 100 m ² is required, a micro strainer can only have a drum body length of about 5 m due to its structure, so it would have a diameter of 6.4 m, which would be difficult to manufacture. If the depth is 5 m, the width is 2 m, and the vertical width is 1 m, the installation area is only 5 m x 2 m = 10 m ² , which makes the filtration equipment extremely compact, and since it is only necessary to stretch the porous permeable body vertically, the tension can be reduced. A small amount of cloth is enough, and it can be manufactured at low cost.There is no rotating shaft or seal part in the water, so the configuration is simple, there are very few breakdowns, and operation management is not required.In addition, it can be used for raw water that tends to fluctuate. too,
Unlike conventional filtration equipment, this method has the advantage of being able to perform stable filtration and continuous filtration, significantly improving work efficiency and being suitable for large-scale processing.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view, FIG. 2 is a cross-sectional view taken along the line in FIG.
This figure is a plan view of another embodiment, FIGS. 4 and 5 are longitudinal cross-sectional views of still other embodiments, and FIG. 6 is a plan view of FIG. 5. 1... Treatment tank, 2... Porous water permeable body, 3... Raw water inlet, 4... Treated water outlet, 5... Raw water inlet pipe, 6... Treated water outlet pipe, 7, 17... Pump,
8, 9...Washing section, 10...Partition wall, 11...Washing drain tank, 12, 19...Discharge pipe, 18...Piping,
20... Traveling trolley, 21... Suction pipe, 23... Wheels, 24... Sludge removal pipe, 25... Flow rate control valve, 26
...Sludge drainage valve.

Claims (1)

[Scope of Claims] 1 A treatment tank is divided into a plurality of chambers by a partition wall in which a filtration surface made of a porous water permeable body is provided on the whole or part of the vertical cross section, and one of the chambers is provided with a raw water inflow pipe. and an outflow section provided with a treated water outflow pipe, and a pipe-shaped filtration surface cleaning section is movably arranged in the vicinity of the filtration surface of the vertical partition while maintaining the vertical state, and this filtration surface cleaning 1. A clarifying filtration device, characterized in that the part is connected to a pump, and the filtration surface is cleaned by at least either a suction water flow or a discharge water flow of the pump. 2. The filtration surface cleaning section includes one connected to the inlet side of the pump provided on the inflow section side, and a separate filtration surface cleaning section connected to the discharge side of the pump provided on the outflow section side. 2. The apparatus according to claim 1, wherein said filtration surface is cleaned by suction water flow and discharge pressure water of a pump, each of which is movably disposed in the vicinity of said filtration surface. 3. The filtration surface cleaning section is a filtration surface cleaning section made of a gutter-like, slit-like, or porous tubular member, and circulates and returns part or all of the suction water flow sucked by the filtration surface cleaning section to the inflow section. An apparatus according to claim 1 or 2, wherein the apparatus is: 4. The device according to any one of claims 1 to 3, wherein the pump has a suction pipe and a discharge pipe, and is mounted on a traveling trolley and moved. . 5. The device according to any one of claims 1 to 4, wherein the filtration surface cleaning section has a rotary joint on a pipe connected thereto so that it can be lifted above the water surface for cleaning.