JPH0771019A - Removing method of dregs and/or oily materials in water to be treated and preliminary treating device and water purifier by use thereof - Google Patents

Abstract

PURPOSE:To simply and effectively separate and reject coarse dregs and oil and fat in water, by arranging a weir screen having passing holes at a part thereof at the full width of a water way and at a slant against the stream. CONSTITUTION:A weir is put in a water way. The installation angle and kind of a weir screen 10 is changed in accordance with the width of water way and the kind of dregs flowing in the stream When removing driftwood for instance, a weir screen having large holes is installed at the full width of the water way and at a slant against the stream. And driftwood is collected at first at the middle of a river and guided to a dregs pool 20 provided at the side wall of water way while sending it along the weir screen 10 and removed from the stream. In this way, driftwood can be effectively removed without use of large devices and rakes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing residue and / or oil in treated water. More specifically, a weir screen is installed over the entire width in the flow direction of the water channel, and the installation angle of the weir screen is set to the water channel. By appropriately controlling the liquid flow force (hereinafter, referred to as flowing water force) according to the state of No. 3, the residue and / or oil in the treated water can be easily and easily obtained without using any special device. The present invention relates to a method for removing residues and / or oils in treated water that enables efficient collection / removal and a pretreatment facility using the same.

[0002]

2. Description of the Related Art Conventionally, domestic wastewater, industrial wastewater, and the like related to human life and production activities are sent to a treatment facility for purification treatment and then discharged to a river or the like. The wastewater sent to these wastewater treatment facilities is, first of all, the first stage, for example, a fence (bar screen) provided in a waterway having a large number of slits called a coarse screen.
Then, the coarse dust in the water is captured and collected. Such a coarse screen is provided over the entire width of the water channel and at right angles to the flow, and further has a shape higher than the water surface so as to deal with dust in the entire range of the water flow. In addition, the dust captured on the screen is scraped by a rake-like thing called a rake such as a manual or automatic scraping device,
Excluded outside the waterway. However, since the conventional weir requires a means such as a rake for removing coarse dust, there is a problem that a large-scale facility is required and a simple treatment cannot be performed. In particular, the width of the water channel is large and the amount of water flowing through it is large,
Further, when a large amount of coarse dust such as driftwood is mixed in the treated water flowing through the water channel, a large amount of coarse dust accumulates on the coarse screen and the water resistance is large, which causes a problem of damaging the screen. . Further, since all the coarse dust caught on the screen is handled simultaneously and collectively during the wastewater treatment work, there is a problem that the subsequent efficient treatment is lacking.

Further, with the above-mentioned coarse screen, it is difficult to collect and remove the oil and fat contained in the waste water, and the oil and fat may stick to the screen or may pass through the screen to There is also a problem that it is difficult to purify the wastewater because it flows into each treatment tank without being removed to the treatment stage and further to the final treatment stage. For example, wastewater from many Chinese restaurants contains a large amount of fats and oils, but when these fats and oils flow through the bar screen to the activated sludge treatment tank,
The treatment tank becomes oxygen deficient and the treatment efficiency is significantly impaired. Also, if oil or fat sticks to the screen, it may cause clogging of the screen, which may not effectively remove coarse dust or may damage the screen. It also impairs the screen function of removing dust. Furthermore, it is difficult to remove the oil and fat components that are sticky on the screen, and this removal requires a great deal of expense and labor.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a purification treatment facility for coarse dust such as driftwood and oil and fat in the wastewater (treated water) flowing through the flow channel, and even dust having a high specific gravity. Provide a pretreatment facility with high treatment efficiency and a method for removing residue and / or oil in treated water that can be easily and efficiently separated and captured, collected, and eliminated at the entrance stage of Especially.

[0005]

The above object can be achieved by the present invention described below. That is, according to the present invention, a weir screen having a flow hole in at least a part thereof is installed so as to extend over the entire width in the flow direction of the water channel and have an arbitrary inclination angle with respect to the flow direction, and the weir screen is placed on the flow of the liquid so that A method for removing residue and / or oil in treated water, characterized in that the residue and / or oil is allowed to flow naturally along the weir screen and is guided to the vicinity of the side wall of the waterway to collect and remove the residue and / or oil. And the pretreatment facility used for this.

[0006]

As a result of earnest research to solve the above-mentioned problems of the prior art, the present inventor has found that the width (amount of water) of a water channel and the type of water flowing in the water channel (for example, oil and fat in treated water or coarse wood). By changing the installation angle of the weir and the combination of weirs according to the amount of waste, etc., the effective use of the liquid flow force will not require large-scale equipment or equipment, and will mainly remove coarse dust and oil. The present invention has been made based on the finding that it is possible to easily, efficiently capture, collect, and remove, and to remove these at the entrance stage to the purification treatment facility.
That is, if a weir screen having a flow hole such as a slit in the entire weir is provided at a position having an inclination angle inclined to the downstream side with respect to the flow direction of the water channel, it is provided with coarse dust such as collapsed driftwood. Are first captured by the weir, and then these coarse debris naturally flow along the weir screen, which has a plane inclination angle with respect to the flow direction of the waterway by the hydrodynamic force, and are provided on the side wall of the waterway. It is easily led to the residue pool. As a result, coarse dust such as driftwood can be easily removed from the treated water without requiring large-scale equipment.

Further, in the case of a weir having a relatively narrow water channel, for example, if a submerged weir is constructed in which a bar screen, which is a through hole, is provided only in the lower part of the weir when viewed laterally, a submerged weir is constructed. As a result of passing only the etc. through the bar screen portion, the oil and fat contained in the water together with the floating coarse dust such as driftwood and plastic containers also remain at the upper part of the submerged weir. As described above, these also flow naturally along the weir that has an inclination angle with respect to the flow direction of the water channel by hydraulic force and are guided to the residue pool, so that not only coarse dust but also oil The minutes can be easily removed. Here, if a submerged flow weir is separately provided on the downstream side where the weir for removing the above-mentioned coarse dust is provided and two types of weirs are used in combination, the coarse dust and the oil and fat components can be recovered separately. Is possible. Further, an overflow weir is further provided on the downstream side of the submerged weir separately provided as described above.
By using different types of weirs in combination, not only coarse dust and oil and fat can be collected separately, but also coarse dust with a large specific gravity such as metal flowing through the screen and flowing to the bottom of the water can be easily It can be removed.

[0008]

The invention will now be described in more detail with reference to the preferred embodiments shown in the drawings. First, the weir of the first aspect embodying the method according to the present invention will be described. The weir is a weir screen having a flow hole in at least a part of which is installed in the entire width in the flow direction of the water channel, In addition, the installation angle is controlled so as to have an arbitrary inclination angle with respect to the flow direction of the water channel. By providing such a weir screen in the water channel, it is possible to easily capture, collect, and remove coarse dust or floating coarse dust and fats and oils without requiring any special equipment.

As shown in FIG. 1, the weir screen of the first aspect is installed over the entire width in the flow direction of the water channel. The installation angle of the weir with respect to the flow direction of the water channel depends on the width of the water channel and the amount of water. It is arbitrarily controlled so that the inclination angle inclined to the downstream side is optimum. When the weir is installed, for example, when the width of the water channel is relatively narrow, such as 1 to 2 meters, the inclination angle is about 30 degrees with respect to the side wall of the water channel as shown in FIG. The smaller the installation angle is, the more preferable. However, if the installation angle is too small, the length of the weir becomes too long, resulting in poor strength and economical efficiency. Therefore, it is preferable to set the angle to about 20 to 45 degrees.

The inclination angle of the weir screen as described above is
It is appropriately selected according to the width of the canal, but when the width of the canal is as wide as 3 meters or more, for example, 10 meters, a straight weir will make the weir too long, and the weir will receive it. As the resistance of water increases and the strength and economy are poor,
It is preferable to use a weir having a structure as shown in FIG. That is, an embodiment in which an obstacle is installed in the center of the water channel, a line-shaped weir is provided through the obstacle, and two weir screens having the same inclination angle as above are provided between the obstacle and the side wall of the water channel. It is preferable to use a weir. The shape of the obstacle used at this time is preferably, for example, as shown in FIG. 2, a streamlined shape with its tip facing the water flow so as not to disturb the water flow.

The shape of the weir screen in the above case is
It may be in the form of a bar screen in which a plurality of slits, which are flow holes, are provided over the entire surface of the weir, which is usually used when capturing coarse dust, or it may be a porous hole which is a flow hole over the entire surface of the weir. It may be a perforated plate provided with, or both slits and perforations may be provided. or,
The shape of the slit may be vertical as in the conventional bar screen, but may be horizontal. In particular, when the width of the water channel is wide as shown in FIG. 2 and the amount of water in the water channel is large, and the flow is fast, it is preferable to form a horizontal slit shape in order to reduce the resistance of the water. The width of the slit and the size of the hole depend on the type of water to be treated, such as the type of coarse dust and the flow velocity.
It is determined appropriately.

The coarse dust such as driftwood flowing in the waterway is first captured and blocked by the weir screen of the first aspect as described above. In the present invention, as described above, since the weir screen is installed in a state where the weir screen has an arbitrary inclination angle with respect to the flow direction of the water channel, the blocked driftwood and the like move along with the flow of the liquid and the weir. Move along the screen and reach the side wall of the waterway. As shown in Fig. 1, the side wall of the waterway where the end of the weir screen is provided has a residue reservoir separated by a gate. It can be easily sent to the residue pool by opening. In the case of the broken line weir shown in FIG. 2, it is preferable to provide a residue pool on both side walls of the water channel to which the end of the weir is fixed.

Further, a first method to which the method according to the present invention is applied
It is also preferable that the weir screen of this aspect has a structure in which the weir screen is provided not at the entire surface of the weir but at least in part. For example, as shown in FIG. 3, a flow hole such as a slit is provided only in the lower part of the weir to form a submerged weir. However, when such a submerged weir is used, the resistance of water to the weir is greater than when a circulation hole is provided on the entire surface of the weir, so the residue of the treated water in a relatively narrow canal up to several meters is retained. It is preferable to apply to the removal method. In the case of a submerged weir, not only coarse dust, which is floating material such as driftwood, but also oil and fat in the water is stopped on the upper part of the weir where the flow holes are not provided. Therefore, if the structure of the weir screen is a submerged weir, it is particularly effective when treating not only coarse dust but also water containing a large amount of oil and fat in the treated water. That is, since the circulation holes such as slits are provided only in the lower portion of the weir, not in the entire surface, coarse dust such as driftwood and fats and oils are blocked and accumulated at the upper portion of the weir where the circulation holes are not provided. , It flows along the weir along with the liquid flow and is naturally guided to the residue pool and removed from the water.

Next, the weir of the second aspect which embodies the method according to the present invention will be explained. The weir of the second aspect is provided with a submerged weir having a right angle or an inclination angle to the flow direction of the water channel over the entire width of the water channel on the downstream side of the weir of the first aspect, and two weirs are combined. It is characterized by being. That is, in the weir of the second aspect, as shown in FIG. 4, a particularly preferable substream weir for removing oil and fat is provided in the downstream portion of the weir screen for mainly removing the coarse dust of the above-described first aspect. It is provided separately and configured by combining. With such a configuration, it is possible to separately capture, collect, and remove the coarse dust and the oil and fat components without requiring any special equipment. The shape and the like of the submerged weir will be described later.

Next, the weir of the third aspect which embodies the method according to the present invention will be explained. The weir of the third aspect, for example, installs an overflow weir further downstream of the weir of the second aspect in which the above-described submerged weir is combined as shown in FIG. It is characterized by combining three types of weirs. With such a configuration, not only can coarse dust and fats and oils be separately captured / collected / excluded without any special equipment, but also coarse dust with a high specific gravity can be captured separately.・ It becomes possible to collect and exclude. The shape of the overflow weir will be described later.

The submerged weir and the overflow weir used in the weirs of the second and third aspects described above will be described in more detail below. As shown in FIG. 4, the submerged weir 1 is provided over the entire width of the water channel, and has a submerged portion in which a water stream flows under the weir when viewed laterally. The submerged weir is movable when fixed. It doesn't matter. As shown in FIG. 4, it is also a preferable embodiment that an oil outflow prevention plate is provided near the upper part of the submerged portion so as to capture as much oil as possible. Further, the submerged weir 1 may be installed at a right angle to the flow direction of the water channel (shown in FIG. 5), or may be installed with an inclination angle inclined to the downstream side with respect to the flow direction of the water channel (FIG. 5). 4 etc.). Further, the height of the submerged weir 1 is determined in consideration of the fluctuation of the water level so that a part of the submerged weir 1 is always exposed from above the water surface. When used in the weir of the third aspect, as shown in FIG. 5 and FIG. 6, it is possible to more efficiently capture oil and fat and lightweight coarse dust,
It is preferable to set the lower end of the submerged weir 1 to be slightly lower than the upper end of the overflow weir 2.

With such a structure, coarse dust such as foamed resin products and driftwood that have flowed downstream without being captured by the weir screen of the first aspect, slits of the weir of the first aspect, etc. Oils and fats and the like that have slipped through the gap are blocked by the upper portion of the submerged weir 1 in which no circulation hole is provided. On this occasion,
Dust and the like having a high specific gravity passing through the submerged portion below the submerged weir 1 flows to the downstream side together with the drainage. However, if the weir of the second aspect having the submerged weir 1 is provided, in particular, the oil and fat content Since the specific gravity is light and floats on the surface of the treated water in the water channel, it does not invade the lower part of the submerged weir 1 to flow into the downstream, and is always stopped by the submerged weir 1.

Next, the oil and fat that is blocked by the submerged weir 1 and drifts on the water surface around the inside of the weir is collected in one place by any means, and then drainage containing a large amount of oil and fat is pumped in. By suctioning, most of the fats and oils in the treated water can be easily recovered, and as a result, the fats and oils exhibiting troublesome behavior in purification treatment of wastewater can be easily and efficiently removed from the wastewater. As a means for collecting oil and fat in one place, the submerged weir 1 is installed so as to have an inclination angle by being inclined to the downstream side in the same manner as the weir screen of the first mode for capturing coarse dust, and the flowing hydropower is used. The water containing a large amount of oil and fat on the water surface part is naturally flowed along the weir by using, and is guided toward the oil sump provided on the side surface of the waterway. As a result, as shown in FIG. 3, oil and fat are collected inside the weir at the portion intersecting with the water channel at an acute angle. Therefore, an oil sump is provided in the vicinity of the weir.
Then, a portion containing a large amount of oil is sucked from above by a suction pump or the like, or a valve 5 communicating with this portion is provided as shown in FIG. 3 to remove drainage rich in oil and fat collected by opening and closing the valve 5. Good.

The overflow weir 2 used for the weir of the third aspect.
For example, as shown in FIG. 5 and FIG. 6, is provided over the entire width of the water channel, and is configured to have an overflow portion through which the water flow flows in the upper part of the weir. The height of the overflow weir 1 is determined in consideration of the height of the underflow portion of the underflow weir. For example,
In order to allow coarse dust having a high specific gravity that has passed through the submerged weir of the submerged weir to be caught by the overflow weir, the circulation part that constitutes the overflow part rather than the lower side of the circulation part that constitutes the submerged part of the submerged weir 1. It is preferable to keep the lower position higher.

The overflow weir 2 does not matter whether it is fixed or movable, like the submerged weir 1, and, like the submerged weir, in the flow direction of the water channel as shown in FIG. They may be installed at right angles to each other, or may be installed with an inclination angle with respect to the flow direction of the water channel (shown in FIG. 6). For example, when the submerged weir 1 is provided so as to have an inclination angle with respect to the water flow direction, the overflow weir 2 is also installed so as to be inclined with respect to the plane of the water channel as shown in FIG. Just as the oil and fat gathered in one place, coarse dust with a heavy specific gravity naturally gathers in one sharp corner of the overflow weir due to the force of the flow, so it is possible to remove it like this. .

The submerged weir 1 which constitutes the weir of the present invention has the structure described above as long as it can capture and collect floating substances such as oil and fat and light dust, and has a submerged flow flowing thereunder. The structure is not limited to the example, and any other shape can be used. In addition, the overflow weir 2 which constitutes the weir of the present invention has a structure capable of capturing and collecting coarse dust such as heavy metal, pottery, driftwood, etc., and having an overflow flowing therethrough. However, the structure is not limited to those described in the above examples, and any other shape can be used. That is, in the example shown in FIG. 5, as shown in FIG. 5, nothing is provided in the lower portion of the submerged weir 1 where the submerged flow flows and the portion where the overflow of the overflow weir flows. ,
The submerged weir 1 and the overflow weir are provided in the water channel in a so-called suspended state.

On the other hand, as shown in the perspective view of FIG.
It may have a structure in which a weir is provided over the entire cross section of the water channel. However, in this case, a vertical or horizontal slit or a flow hole such as a porous hole is provided in the submerged portion or the overflow portion so that the submerged flow or the overflow can flow therethrough. In this case, the debris with a high specific gravity contained in the submerged flow also flows into the submerged dam 1.
Is caught to some extent and is processed here. Therefore,
It is more preferable that the width of the slit and the size of the hole are larger in the submerged weir 1 than in the overflow weir 2. According to the above-mentioned aspect, the burden on the overflow weir 2 can be reduced, and damage to the overflow weir 2 which is likely to be burdened can be prevented.

In addition, as a means for reducing the burden on the overflow weir, as shown in FIG. 7, for example, the submerged weir 1 may be inclined at a gentle inclination of about 15 ° with respect to the bottom of the water channel. If
Since the dust contained in the underwater flow is easily caught by the submerged weir 1 and pushed up, the dust collecting operation is facilitated and the coarse dust toward the overflow weir 2 can be significantly reduced.

The shape of the submerged weir 1 may be a flat plate shape as shown in FIGS. 3 to 7, or a rectangular shape (not shown) having a corner part which becomes a fat and oil reservoir. .
Further, the shape of the submerged weir and the overflow weir may be any shape such as a curved surface shape having a part of an arc as shown in FIGS. 8 to 10.

As shown in FIG. 8 (a), when the submerged flow dam 1 is formed into a curved surface having a circular arc in a part, oil and fat gather and float inside the circular arc-shaped recess. It is preferable to attach a drain pipe for draining a large amount of oil and fat to this portion. Further, in order to remove dusts of the light weight substances trapped in the arc-shaped submerged weir 1, a slit can be provided in the submerged portion and the inner surface of the arc can be swept, and the trapped dust 4
It is preferable to provide a rotating arm 7 capable of sweeping out into the container 6. Further, as shown in FIG. 9, it is possible to install the arc-shaped submerged weir 1 which is convex toward the upstream side. In this case, in order to sweep out the dust accumulated on the outer peripheral portion of the arc, it is preferable that the slit of the submerged portion has a structure in which a scraping claw is inserted. Further, as shown in FIG. 10, it is also a preferred embodiment that not only the submerged weir 1 but also the overflow weir 2 has an arc shape, and slits or perforations are provided in the submerged portion and the overflow portion.

FIG. 11 is a schematic view showing a part of a wastewater purification facility using the weir of the present invention. FIG. 11 (a) is a plan view of a pretreatment facility used integrally with the weir of the present invention,
FIG. 11B is a sectional view thereof. As shown in FIG. 11, the drainage firstly comprises a screen having an inclination angle as a first stage and a coarse screen portion composed of a weir of a third aspect in which the present invention is implemented which is composed of a submerged weir 1 and an overflow weir 2. As a result of the passage, as explained above, most of the coarse dust and oil and fat components in the waste water are removed separately. Next, the wastewater that has been processed by passing through the coarse screen portion flows to a place where a fine elbow screen is provided, as shown in FIG. 11 (b). Here, even fine dust of about 0.5 to 1 mm is captured and collected, and is discarded in the residue reservoir. Further, in this portion, oil and fat having a large specific gravity that has passed through the coarse screen portion is also captured and discarded in the oil sump.

As described above, the wastewater from which most of the fats and oils and dust in the treated water have been removed is sent to the treatment device provided with the rotating cylinder. Here, since the sand accumulates in the lower center of the tank due to the rotation of the rotary cylinder, the sand is removed by suction with a pump or the like. The oil and scum collected by the rotation are removed by lowering the gate to the oil sump. As described above, the oil / fat, dust, sand and scum in the wastewater are physically separated and removed from the wastewater, whereby the treatment efficiency is improved and, as a result, high-quality treated water is obtained. Fig. 12 shows the overall flow up to the discharge of wastewater purification treatment. The wastewater treated as described above is then subjected to high-grade chemical or biological treatment such as oxidation treatment or activated sludge treatment. Will be released and released.

[0028]

As described above, according to the present invention, particularly, coarse dust, waste oil and fat having a large specific gravity in waste water are also separated, so that trapping, collecting and removing can be performed easily and efficiently. It Further, according to the present invention, the efficiency of the purification treatment of wastewater can be remarkably enhanced by introducing the coarse screen portion capable of exhibiting the above excellent effects into the water treatment facility.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a weir screen of a first mode in which a method according to the present invention is carried out. (A) is a schematic plan view, (b) is a schematic sectional view.

FIG. 2 is a diagram showing another example of the weir of the first aspect.

FIG. 3 is a diagram showing another example of the weir of the first aspect.

FIG. 4 is a diagram showing an example of the weir of the second aspect in which the method according to the present invention is carried out.

FIG. 5 is a diagram showing an example of a weir of a third aspect in which the method according to the present invention has been carried out.

FIG. 6 is a diagram showing another example of the weir of the third aspect.

FIG. 7 is a diagram showing another example of the weir of the third aspect.

FIG. 8 is a view showing portions of a submerged weir and an overflow weir of another example of the weir of the third aspect.

FIG. 9 is a view showing a portion of a submerged weir which is another example of the weir of the third aspect.

FIG. 10 is a view showing a portion of a submerged weir and an overflow weir of another example of the weir of the third aspect.

11A is a schematic plan view and FIG. 11B is a schematic sectional view when the weir of the third aspect is applied to a water purification treatment facility.

FIG. 12 is a flowchart when the weir of the third aspect according to the present invention is applied to a water purification treatment facility.

[Explanation of symbols]

 1: Submerged weir 2: Overflow weir 3: Oil / fat 5: Valve 6: Garbage 7: Arm 10: Weir with inclination angle 20: Dust residue pool

Claims (6)

[Claims] 1. A weir screen having a flow hole in at least a part thereof is installed so as to extend over the entire width of a water channel in the flow direction and has an arbitrary inclination angle with respect to the flow direction. And / or an oil component is allowed to flow naturally along the weir screen and is guided to the vicinity of the side wall of the waterway to collect and remove the residue and / or the oil component, and a method for removing the residue and / or the oil component in the treated water. 2. The residue and / or residue in the treated water according to claim 1, wherein the weir screen is a submerged weir having a portion having no flow holes.
Or a method of removing oil. 3. A straight or curved submerged weir having a submerged portion installed at a position having a right angle or an inclination angle with respect to the entire width in the flow direction of the water channel is provided on the downstream side of the weir screen. A method for removing residue and / or oil in the treated water as described. 4. A straight or curved overflow weir having an overflow portion installed at a position having a right angle or an inclination angle with respect to the entire width in the flow direction of the water channel is provided downstream of the submerged weir. Item 4. A method for removing residue and / or oil in treated water according to Item 3. 5. A power source to which at least one of a coarse screen portion, a fine submerged screen portion, a floating cylinder / floating oil / fat and sand removing device by a rotating cylinder, a fine screen portion, and pump equipment including a main pump is connected. A pretreatment facility including facilities, wherein the coarse or fine screen portion uses the method for removing residue and / or oil in treated water according to claim 1. 6. A sewage treatment facility comprising the pretreatment facility according to claim 5.