JPS62289289A - Method for removing floating matter - Google Patents

Abstract

PURPOSE:To inexpensively and easily discriminate floating matter from treated water of supernatant water and to remove the floating matter from said water by pulling a baffle plate up onto the water surface at proper times so as to discharge the floating matter accumulated by the baffle plate for a long period of time from an overflow weir. CONSTITUTION:The baffle plate 5 which is provided to the inside peripheral side of the overflow weir 4 to discharge the supernatant water and is used to block the outflow of the floating matter is held by a holder 15 fixed to the overflow weir 4 in a water draining path 2 provided with the above- mentioned overflow weir 4 along the upper peripheral edge of a tank body 1. The baffle plate 5 is pulled up onto the water surface at proper times to discharge the floating matter blocked by the baffle plate 5 from the overflow weir 4, by which the floating matter is separated from the treated water of the supernatant water and is removed. The above-mentioned method for remov ing the floating matter is easy in operation, simple in construction and low in cost.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to the treatment of fine flocs, scum, etc. floating on the water surface of a circular settling tank, sludge aUa tank, etc. of a water treatment plant. This invention relates to a method for removing floating objects.

[Prior art]

In water treatment, it is necessary to remove particles dispersed or suspended in raw water or wastewater. For this reason, adding a flocculant to the water to be treated is +5! By mechanical stirring, the dispersed particles and suspended particles in the water are aggregated into 70 pieces, which are introduced into a circular sedimentation tank or the like, where the 70 pieces are allowed to settle naturally to remove the dispersed particles and suspended particles.

This method is easy to operate and inexpensive, and is popular as a method for dispersing water treatment and removing suspended particles. Due to their structure, tanks, sludge thickening tanks, etc. have the disadvantage that they cannot sufficiently remove floating substances such as buoyant fine particles and scum. Facilities are installed to forcibly remove 1,170 particles, scum, etc.

That is, as shown in FIG. 1, a drainage channel 2 is provided along the inner circumference of a tank body 1 of a circular settling tank or sludge thickening tank, and an overflow weir 4 is attached to a side wall 3 of this drainage channel 2. Furthermore, a baffle plate 5 is disposed inside thereof to prevent floating objects from flowing out. A rotary floating object scraper is installed inside the tank body 1, and an example of a floating object scraper is shown in FIGS. 1 and 2 on the tank wall of the tank body 1. An electric motor 7 is arranged on the girder 6 stretched over the upper surface, and the rotating axle 8 is driven by this electric motor 8!7.
A tank is used in which the flocs and sludge accumulated at the bottom of the tank are scraped up to the center using a scraping plate 9 provided at the bottom of the rotating axle 8.

On the other hand, raw water and treated sludge flowing into the tank body 1 pass through an inflow pipe 10 extending into the tank from the side of the tank wall, and pass through a rectifying tube 11 fixed to the rotary axle 8 at a position above the center of the tank. , and is diffused from this straightening tube 11 into the surrounding tank.

An arm 13 for attaching a floating object skimmer is fixed in the radial direction near the upper part of the outer periphery of the rectifying tube 11 at a position above the water surface 12, and a floating object skimmer 14 made of a rubber plate is attached to the lower side of this arm 13. Approximately half of its height will be submerged below the water surface 12! ! ! AIt is installed vertically.

Therefore, floating objects floating on the water surface 12 are scraped up by rotating the skimmer 14, dropped into a floating object box (not shown), and then discharged to the outside of the tank.

That is, in the treatment of raw water and treated sludge in such a circular sedimentation tank or sediment concentration tank, most of the raw water and treated sludge are discharged as settled and concentrated sludge and sludge, and only a small amount of floating matter rises to the surface of the water 12. This is successively prevented from flowing out by the baffle plate 5 and becomes piled up. And this ;! ! F
The accumulated floating objects are removed from the tank by intermittently driving a floating object scraper.

[Problem that the invention seeks to solve]

However, in the conventional technology shown in FIGS. 1 and 2, floating objects that have been piled up by RF over a long period of time are removed by driving a complexly configured floating object scraper. Moreover, since the floating object skimmer of the floating object scraper is installed so as to be submerged below the water surface, there is a drawback that floating objects or generated algae may adhere to it.

For this reason, the floating objects cannot be scraped up as intended, resulting in a reduction in the removal processing capacity, and the adhering substances and the like are periodically removed manually using noet water or a brush. However, when using Noet water, the adhesion vlJ
It is difficult to completely remove M, etc., and using a brush increases the complexity of the work, which is not preferable in terms of maintenance and management.

The present invention has been made in view of this, and it is necessary to use a complexly structured floating object m approach as in the conventional technology.
By lifting the baffle plates above the water surface in a timely manner, the floating objects accumulated by the baffle plates for a long period of time are allowed to flow out of the overflow weir, and separated from the treated water of the upper water. ,
It is an object of the present invention to provide a method for removing floating objects that can be performed using inexpensive equipment and is easy to operate.

[Means for solving problems]

The Vtr& of the present invention to achieve the above object is a drainage channel equipped with an overflow weir that drains supernatant water along the upper periphery of the tank body, and a floating object provided on the inner peripheral side of the overflow weir. A baffle plate that prevents outflow is fixed to the overflow weir, and the floating objects blocked by the baffle plate are removed at the appropriate time (by raising the baffle plate above the water surface and allowing it to flow out from the overflow weir). The gist of the 1rl water is to separate it.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 3 is a sectional view of an example of a settling tank or a sludge thickening tank applied to the present invention.

The present invention is applied to, for example, an apparatus as shown in FIG. ttS1, and in the embodiment shown in FIG. 3, parts corresponding to those in FIG.

In this embodiment, an overflow weir 2 is provided in the waterway 2 equipped with an overflow weir 4 that drains supernatant water along the upper periphery of the tank body 1.
A baffle plate 5 for preventing floating objects from flowing out is held on the inner peripheral side of the weir 4 by a holder 15 and fixed to the overflow weir 4.

As shown in FIG. 4, the holding part 15 has a hook part 16 that hangs on the upper end of the overflow weir 4 at one end, and is provided with a fixing bolt 17 for fixing it to the overflow weir 4. A holding portion 18 for fitting and holding the baffle plate 5 is provided at the end.

A locking piece 19 is attached to the holding portion 18 for lifting and locking the baffle plate 5 above the water surface 12.

A plurality of these holders 15 are provided at the overflow weir 4 of the drainage channel 2 provided along the upper periphery of the tank body 1, and the baffle plate 5 is held so that the floating material flows out from the overflow weir/t into the drainage channel 2. is prevented from doing so. FIG. 5(a) is an enlarged sectional view of a main part to explain this, and FIG. 5(b) is a view taken along the line A--A in FIG. 5(a). The floating objects floating on the water surface 12 are prevented from flowing into the overflow weir 4 by the baffle plate 5, and the clear water in which 70 pieces have settled in the tank is passed through the V-shaped notch from the bottom of the baffle plate 5. The treated water flows from the flow weir 4 to the drainage channel 2 and is sent from the treated water valve 20 to a treated water tank (not shown). Accumulated by the baffle plate 5 r:
, the floating object is removed by lifting the baffle plate 5 above the water surface 12.
By locking the lower ends of the water to the locking pieces 19 of the respective holding parts 18, the treated water flows toward the overflow weir 4 and is introduced from the overflow weir 4 into the drainage channel 2. At the same time, the treated water valve 20 is closed and the 'J! By opening the upper material valve 21, the floating material is separated from the treated supernatant water (Fig. 6(a),
(b)).

This operation may be carried out at an appropriate time depending on the properties of the raw water and treated sludge or the amount of floating matter piled up. After the floating objects are removed from the water surface 12, the baffle plates 5 are fitted into their respective holding parts 18 in their original state, the treated water valve 20 is opened, and the floating object valve 21 is closed.

Such a baffle plate 5 is made of a lightweight material and is held by the holding ff1S18 while floating in the water, so that it can be easily pulled up above the water surface 12.

In the present invention, the baffle plate 5 is removed from the holding part 18 and the water surface 12 is removed.
You can pull it up, but as shown in Figure @7, fix the baffle plate 5 to the holding part 18 and hang it! It is also possible to slide the IS 16 upward, fix it with the fixing bolt 17, and raise it above the water surface 12.

[Action of the invention]

The method for removing floating objects configured as described above removes floating objects that have been piled up against the baffle plate 5 for a long period of time by removing them from the baffle plate 5 in a timely manner.
By raising the water above the water surface, it flows out from the overflow weir 4, and the supernatant water is separated from the treated water, so there is no need for complicated operations like in the conventional technology, and there is no need to forcibly scrape up floating objects. Since a floating object skimmer is not used,
There is no need to reduce the processing capacity due to the adhesion of floating objects, algae, etc., and there is no need to perform complicated fF operations to remove these adhering substances.

〔Effect of the invention〕

As explained above, the floating object removal method of the present invention is extremely easy to stir, and unlike the conventional method in which a floating object scraper is attached, the structure is extremely simple and can be provided at low cost. Since it can be easily installed in conventionally used circular sedimentation tanks, sludge thickeners, etc. to remove floating substances, it is of great benefit in the maintenance and management of water treatment.

[Brief explanation of drawings]

Figure fjSj is a cross-sectional view of a conventional settling tank or sludge reduction tank, and Figure 2 is an enlarged view of the main part of Figure 1. FIG. 3 is a sectional view of an example of a sedimentation tank or sludge 2 agricultural shrinkage tank applied to the present invention, FIG. 4 is an external perspective view of a holder used in the present invention, and FIG.
[a (a), (b) is an enlarged sectional view of the main part where the baffle plate accumulates floating objects, Fig. 6 (a), (b) is an enlarged explanatory view of the main part where the floating object is separated, Fig. 7 is another t1 used in the present invention.
A perspective view of the appearance of the tool is shown. 1... Tank body 2... Drainage channel 4... Overflow weir 5...
・Baffle plate 7...Electric rock 8...Rotating axle 9...
Scraping plate 10... Inflow pipe 11... Rectifier cylinder 12...
・Water surface 13...Arm 14...Floating object skimmer 15...Holder 16...Latching part 17...Fixing bolt 18...Holding g19...Locking piece 20...
Treated water valve 21 ... Floating object valve patent applicant: Kanmori Gihan Co., Ltd. (Figure 3, Figure 5 (a), Figure 5 (J)), Figure 6 (a), Figure 7 ゛＼

Claims (1)

[Claims] 1) In a drainage channel equipped with an overflow weir that drains supernatant water along the upper periphery of the tank body, a baffle plate installed on the inner circumference of the overflow weir to prevent floating objects from flowing out is installed on the overflow weir. Floating objects held in a fixed holder and blocked by a baffle plate should be raised above the water surface in a timely manner, allowed to flow out through an overflow weir, and separated from the treated supernatant water. Characteristic floating object removal method.