JPS58112007A - Separation of solid substance contained in water - Google Patents

Abstract

PURPOSE:To eliminate the obstraction of the slide-down of a precipitate due to an obliquely rising stream, by precipitating solid substance on the surface of a perforated inclined plate when water containing said solid substance rises obliquely and falling the same into a separation chamber to eliminate the re-entry of the precipitate into water. CONSTITUTION:When water containing solid substance sent into from a raw water inlet 5 rises obliquely through a gap 7, the solid substance is precipitated onto the surface of a perforated inclined plate 2 and enters a separation chamber 10 from orifices 8. The upper end of the separation chamber is closed by a closing plate 4 and water is not flowed upwardly. Water is obliquely raised to be flowed into a treating tank 9 and discharged from a discharge pipe 21. The solid substance is transferred to the bottom 11 of the separation chamber 10 and transferred to a thickener bottom 15 through a falling pipe 14 from an opening part 13 to be discharged through a valve 16. Plural falling pipes 14 are studded in a bottom part 6 but, because gaps are mutually provided between pipes, raw water is extended throughout the cross area of the tank bottom part and is obliquely raised through all gaps 7 between separation chambers 10 to carry out solid substance precipitating and separating work. Raw water rising from the tank bottom part is not collided with the precipitate solid down toward the lower end of the inclined plate.

Description

DETAILED DESCRIPTION OF THE INVENTION Hitherto, inclined plate thickeners have been widely used to separate solids in liquids by sedimentation or to separate flocs in wastewater treatment by sedimentation. This principle is as shown in Fig. 1, when liquid or water (hereinafter collectively referred to as water) containing solids and flocs (hereinafter collectively referred to as solids) flows obliquely upward between inclined plates.
The solids overcome the upward flow of water and settle on the sloped plate, and the precipitates slide down the sloped plate surface and fall to the bottom of the tank from the bottom of the sloped plate, while the clear water from which the solids have been separated flows from the top of the tank. This is a method of discharging it.

This method has the following drawbacks.

The first drawback is that the water rises obliquely on the surface of the solids precipitated on the inclined plate surface, so it is necessary to prevent the precipitated solids from sliding downward onto the inclined plate surface, and when the water rises at a high speed, Part of the solids that have settled once are returned to the water and the sloping rise again can be omitted.

The second drawback is that solid objects slide down the slope.

When flowing down from the bottom of the inclined plate to the bottom of the tank, it collides with the raw water rising from the bottom of the tank, preventing the solids from settling, and in the worst case, some of the sediment will mix with the raw water and rise again. .

The present invention is a method and apparatus for a tilted plate thickener that eliminates the above drawbacks and is illustrated in FIG.

A plurality of unit separators each consisting of a non-perforated inclined plate (2) and a perforated inclined plate (3) sealed by a sealing plate (4) at the upper end are stored in an inclined plate type thickener (1).

When the raw water containing solids introduced from the raw water inlet (5) ascends obliquely through the separation gap (7), the solids settle on the perforated inclined surface, and then the precipitates pass through the pores. (8) Enter the separation chamber (10) consisting of two inclined plates. Since the upper end of the separation chamber is closed with a sealing plate (4), there is no or almost no upward flow of water in the separation chamber, and the solids that enter the separation chamber are not affected by the upward flow of raw water at all. It precipitates on the non-porous inclined plate surface with almost no reception, and the precipitated solids fall down the non-porous inclined plate surface. On the other hand, the water from which the solids have been separated rises obliquely to the treated water tank (9) at one end and is then discharged from the clear water discharge pipe (21).

The solid matter that has slipped down the non-porous inclined plate surface moves to the bottom (11) of the separation chamber, the cross section of which is shown in FIG. The bottom of the separation chamber (11) has a bottom plate part (work 2) and an opening part (13) alternately, and the solids pass through the opening part (13) and the solid settling tube (14) to the thickener bottom (15). and is discharged through the discharge valve (16). The bottom of the thickener tank (6) has a large number of solid sedimentation tubes (1
4) are scattered, but since there are gaps between the solid settling pipes, the raw water sent from the raw water pipe (5) is distributed all over the bottom of the tank, and the raw water flows through all the separators. Interpipe gap (7
), the solids are precipitated and separated.

As is clear from the above, the present invention is advantageous in that when water containing solids is tilted upward, the solids settle on the perforated inclined plate surface and subsequently fall into the separation chamber through the holes, which is different from the case of the conventional inclined plate type thickener. There is no return of the precipitate into water, and the precipitate that enters the separation chamber and settles on the non-porous inclined plate surface is not prevented from sliding down due to the oblique upward flow of water in the case of the conventional inclined plate thickener.

Furthermore, since the sediment that has slipped to the lower end of the inclined plate passes through the pipe and falls to the bottom of the thickener, there is no collision with the raw water rising from the bottom of the tank, unlike in the case of conventional inclined plate thickeners, and there is no interference with settling of solids. It has many excellent features such as no contamination with raw water.

Although the method of the present invention has been described above, there are various applications and variations in its implementation. For example, in the above example, the solid settling tube (1
4) The lower end is open to the thickener bottom (15),
The lower end may be directly released to the outside of the tank.

In order to reduce equipment costs, the inventor filed an application with application number 1972-(＞
A single separator using a membrane made of fiber, plastic film, rubber, etc. may be used instead of the metal plate, which was applied for patent in 1-Incline Plate Sedimentation Apparatus, filed under No. 04644.

As shown in Figure 4, metal rods (16) are attached to both ends of a long film that has no holes at the top and holes at the bottom, and two rods (16) are attached to the central part of the film with the perforated part facing upward as shown in Figure 5. 17
), (18) and two rods (19), (2o) below the film, the weight of the metal rod (16) causes the perforated membrane and non-porous membrane to suspend in a tension-like body. Therefore, an extremely inexpensive unit separator can be obtained.

[Brief explanation of the drawing]

Figure 1 shows the structure of a conventional inclined plate thickener, Figure 2
Figure '' shows the structure of the thickener of the present invention, Figure 3 is a sectional view of the bottom of the separation chamber, and Figures 4 and 5 show a unit separator using a film instead of a metal plate. (2)... Non-perforated inclined plate (8)... Hole (3)... Perforated inclined plate (10)... Separation chamber (4)... Separation plate (12)...
・Bottom plate part (7)...Gap between separators (13)
...Aperture (14) ...Settlement tube applicant Miura Engineering International Co., Ltd. President and CEO Mitsugu Miura Proceedings Amendment Document 1982 (Monday) / Day 1, Incident Indication 1982 Patent Application No. 215544 2, Name of the invention Method for separating solids contained in water 3, Relationship with the case by the person making the amendment Patent applicant April 27, 1981 5, “Drawings” of the specification to be amended 16 Name of the invention Method for separating solids contained in water 2, Claims (1) As detailed in the main text, the upper part is perforated and the lower part is non-porous. A unit separator is a unit separator in which two inclined plates are arranged in parallel at a certain interval and a sealing plate is provided at the upper end of both sides. Water containing solids is allowed to rise between the unit separators at an angle, and the solids that have settled on the perforated inclined plate surface pass through the holes and enter the separation chamber formed by the perforated and non-perforated inclined plates, and are then allowed to settle downward. ,
A method for separating solids contained in water, characterized by discharging water from which solids have been separated as clear water from above an inclined plate. (2) A method for separating solids contained in water, which is characterized by lowering solids to the bottom of a tank using a sedimentation tube. 3. Detailed Description of the Invention Hitherto, inclined plate thickeners have been widely used to separate solids in liquids by sedimentation or to separate aggregates in wastewater treatment by sedimentation. This principle is as shown in Figure 1, when liquid or water (hereinafter collectively referred to as water) containing solids and flocs (hereinafter collectively referred to as solids) flows obliquely upward between the inclined plates (22), the solids The slanted plate (22
), the precipitate slides down on the inclined plate surface and falls from the lower end of the inclined plate to the tank bottom (23), while the clear water from which the solids have been separated is discharged from the tank top (21). This method has the following drawbacks. The first drawback is that water rises obliquely on the surface of the solids precipitated on the inclined plate surface, so it is necessary to prevent the precipitated solids from sliding downward onto the inclined plate surface, and when the water rises obliquely at a high speed. The process involves returning part of the solids that have settled into the water and raising them up again. The second drawback is that when the solids that have slid down the slope descend from the bottom of the slope to the bottom of the tank, they collide with the raw water rising from the bottom of the tank, preventing the solids from settling, and in the worst case scenario. Part of the sediment mixes with the raw water again and rises. The present invention is a method for separating substances contained in water using an inclined plate thickener that eliminates the above-mentioned drawbacks, and will be explained with reference to FIG. 2 and FIG. 3, which is a side view thereof. A plurality of unit separators each consisting of a non-perforated inclined plate (2) and a perforated inclined plate (3) sealed with a sealing plate (4) at the upper end are stored in an inclined plate type thickener (υ). Raw water When the raw water containing solids fed through the inlet (5) ascends obliquely through the gap (7) between the separator tubes, the solids precipitate on the perforated inclined surface, and then the precipitates pass through the holes (8). The upper end of the separation chamber is closed with a sealing plate (4), so there is no or almost no upward flow of water in the separation chamber, and the separation is completed. The solids that enter the chamber are not affected by the upward flow of raw water at all or are hardly affected by the upward flow of raw water: they settle on the inclined plate surface of the inclined hole and the precipitated solids slide down the non-porous inclined plate surface. On the other hand, the water from which the solids have been separated begins to ascend obliquely to the treated water tank (9) at the upper end and is then discharged from the clear water discharge pipe (21). Moving on to the separation chamber bottom (11), which shows the cross section of the separation chamber, the separation chamber bottom (11) has a bottom plate portion (12) and an opening portion (13) alternately existing, and the solids are more solid than the opening portion (13). The solids pass through the settling pipe (14) to the thickener bottom (15) and are discharged through the discharge valve (16).
4) are scattered, but since there are voids between the solid settling pipes, the raw water sent from the raw water pipe (5) is distributed across the bottom section of the tank, and the raw water flows between all the separators. Pipe gap (7
), the solids are precipitated and separated. As is clear from the above, the present invention is advantageous in that when water containing solids is tilted upward, the solids settle on the perforated inclined plate surface and subsequently fall into the separation chamber through the holes, which is different from the case of the conventional inclined plate type thickener. There is no return of the precipitate into water, and the precipitate that enters the separation chamber and settles on the surface of the non-porous inclined plate does not prevent the precipitate from sliding off due to the oblique upward flow of water in the case of conventional inclined plate thickeners.・Furthermore, since the sediment that has slipped to the bottom of the inclined plate falls through the pipe to the bottom of the tank, there is no collision with the raw water rising from the bottom of the tank, which is the case with conventional inclined plate thickeners, and there is no interference with settling of solids. Although the method of the present invention has been described above, there are various applications and variations in its apparatus. For example, in the above example, the lower end of the solid sedimentation tube (14) is open to the bottom of the 7-sockener (15). Number Showa 52-00464
A single separator that uses a membrane made of fiber, plastic film, rubber, etc. instead of a metal plate may be used instead of a metal plate, as in the case of the patent application for the ``inclined plate sedimentation device'' applied for in Figure 4. Attach metal rods (16)'e to both ends of a long film that has no holes in the upper half and holes in the lower half as shown, and attach two rods (16) to the central part of the film with the perforated part facing up as shown in Figure 6.
17) and (18), and two rods (19) and (20) below the film, the metal rod (16)
), the perforated membrane and the non-porous membrane are suspended under tension, resulting in an extremely inexpensive unit separator. 4. Brief description of the drawings Figure 1 shows the structure of a conventional thickener with 7 inclined plates. Figure 6 shows a unit separator using a film instead of a metal plate. (2)... Non-perforated inclined plate (8)... Hole (
3)...Perforated inclined plate (10)...Separation chamber (4)...Blocking plate (12)...Bottom plate (7)...Gap between separators (I3)...・
Opening part (14)...Settlement tube applicant Mitsugu Miura, President and Director of Miura Engineering International Co., Ltd.

Claims (2)

[Claims] (1) As detailed in the main text, a unit separator is a unit separator in which two inclined plates with holes on the upper side and non-perforated on the lower side are arranged in parallel at a certain interval, and sealing plates are provided at the upper ends of both; In an inclined plate type thickener in which a large number of unit separators are arranged in parallel at intervals, water containing solids is allowed to rise obliquely between the unit separators, and the solids precipitated on the perforated inclined plate surface pass through the holes. into a separation chamber formed by perforated and imperforate inclined plates, and then allowed to settle downward;
A method for separating solids contained in water, characterized by discharging water from which solids have been separated as clear water from above an inclined plate. (2) In carrying out claim (1), the feature is that the sediment that has slipped to the bottom of the separation chamber is lowered to the bottom of the tank by a sedimentation pipe provided in a part of the cross section of the bottom of the separation chamber. A method for separating solids contained in water.