JP5562116B2 - Processing method of foreign matters - Google Patents

Description

The present invention relates to a method of treating contaminants in the sand basin for sewage treatment facilities.

  A sand basin at a pumping station, one of the sewage treatment facilities, is usually connected to a sewer main line that is several tens of meters below the ground, and a gate (sluice gate) that moves up and down at a predetermined location in the waterway Is provided. Therefore, when this gate is lowered, sewage including rainwater flowing through the water channel can be blocked. Further, on the downstream side of this gate, a front grader which is sometimes referred to as a coarse screen is provided. This front filter machine is configured so as to be able to capture solid contaminants having a size exceeding the opening of the front filter machine.

  The front filter is configured such that a plurality of screen bars extending in the vertical direction over the entire channel width of the channel are arranged parallel to each other at a predetermined interval and have a predetermined inclination angle. . Explaining one specific example, this front grader is constructed by arranging steel screen bars in parallel at intervals of 150 mm over the entire channel width of 2-3 m. Yes. Further, these screen bars are provided with an inclination angle of 60 ° with respect to the bottom surface direction of the water channel so that the lower end side is located on the upstream side of the water flow and the upper end side is located on the upstream side of the water flow. (See FIG. 6 of Patent Document 1).

  A sand raising machine is provided on the downstream side of the front filter, and is provided at a sand settling part provided by digging the bottom surface of the water channel to a predetermined depth. This sand crusher is configured so that sedimentary solids such as sand that has settled in a sand sink can be scooped with a bucket and discharged to the outside.

  A rear screen (sometimes referred to as a “rear machine”) is provided on the downstream side of the sand sander. After this, the screen has a predetermined angle with a plurality of screen bars extending in the vertical direction over the entire width of the water channel in parallel with a predetermined interval. It is configured. An example of a specific configuration of the screen after this is shown. The screen has a screen bar inclination angle of 60 °, which is the same as that of the front filter, but the opening between the screen bars is 25 mm. It is formed small. Thereafter, the screen is provided with a scraping mechanism including a scraper that automatically scrapes impurities captured by the screen bar. Therefore, the screen after this is configured so that the contaminants that could not be captured by the front filter in the previous stage can be captured from the sewage, and the sewage from which the contaminants have been removed (sewage) can be discharged to the pump side (not shown) Has been.

JP 2007-204965 A

However, since the front grader in the conventional method for treating foreign substances performs the manual scraping work of the solid matter captured by the screen bar, it imposes an extremely heavy burden on the worker. It was. In addition, the place where the front grader is installed is a sealed space several tens of meters below ground, and some solid matter captured by the screen bar emits a bad odor. It had the problem of having to work in a poor environment.
In order to solve such problems, it is conceivable that the front filter machine is also provided with a lifting mechanism that automatically lifts up the foreign matter captured by the screen bar, similar to the rear screen. Providing such a lifting mechanism not only has enormous equipment costs, but also raises a new problem of increasing operating costs.

Accordingly, the present invention has been made to solve the above-described drawbacks, and the object thereof is to make it possible to automatically scrape solid matter captured by a screen bar with low equipment costs . It is to provide a processing method .

Method of processing contaminants according to the present invention, in order to achieve the above object, the processing method of the contaminants according to claim 1 is provided on the downstream side of the settling basin of a sewage treatment facility, the trapped contaminants A rear screen provided with a lifting mechanism that automatically lifts and a predetermined opening having an opening larger than the opening of the rear screen that is provided upstream of the settling basin and traps foreign substances flowing into the settling basin A foreign matter processing method for treating foreign matters using a front grader having a front filter case body having an opening and a front filter case having a lifting mechanism for raising and lowering the front filter case body, When the amount of water is low, such as when it is raining, the front filter machine body is raised so that the foreign matter captured by the front filter machine flows out to the rear screen side, and then a lifting mechanism provided on the screen is used. It is characterized by scraping impurities That.
Method of treating contaminants in claim 2 of the present invention, the lifting mechanism is located in front filtrate rated machine body on the upstream side of the lower side water flow, provided with an upper side inclined located downstream side of the water flow It is characterized by being placed on a guide bar and moving on the guide bar.
The foreign matter processing method according to claim 3 of the present invention is characterized in that the filter machine moves the front filter machine main body via a roller that rolls on a guide bar.

Method of treating contaminants in claim 1 of the present invention, when small amount of water, such as during non-precipitation, to flow out contaminants captured by raising the pre-filtrate rated machine body to the rear screen side, then the screen since it is possible to raise automatically scraped using a掻揚mechanism can raise automatically scraped contaminants captured in the previous filtrate rated machine with less equipment cost.
Method of treating contaminants in claim 2 of the present invention, the lifting mechanism is located in front filtrate rated machine body on the upstream side of the lower side water flow, provided with an upper side inclined located downstream side of the water flow Since it is mounted on the guide bar and is moved on the guide bar, the front filter case main body can be raised and lowered with a small power.
Method of treating contaminants in claim 3 of the present invention, prior to filtration rated machine body so move through the rollers rolling on guide bars, it can be smoothly moved in front filtrate rated machine body it can.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the sand basin of a sewer facility to which the front filter grade which concerns on one embodiment of this invention is applied. It is a front view when the front filter case which concerns on one embodiment of this invention is dropped. It is X1-X1 sectional drawing of FIG. It is X2-X2 sectional drawing of FIG. It is a front view when raising the front grader which concerns on one embodiment of this invention. It is X3-X3 sectional drawing of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out a foreign matter processing method according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a part of a sand basin a of a sewage treatment facility to which a front filter according to the present invention is applied. In FIG. 1, 1 is a sand basin a connected to a main line of a sewer. It is a waterway and is usually provided several tens of meters below the ground. And this water channel 1 usually has a water channel width of 2 to 3 m, and on the downstream side of this water channel 1 (refer to the white arrow in FIG. 1), in order, the gate (sluice) 2, the present invention. The front filter machine S, the sand lifter 3 and the rear screen 4 are provided.

  The gate 2 is provided at a predetermined location of the water channel 1 connected to the main line of the sewer, and is configured to move up and down. Therefore, when the gate 2 is lowered, the sewage flowing as shown by the white arrow in FIG. 1 can be blocked and the sewage is prevented from flowing to the front filter machine S side. Can do. In the present invention, “sewage” includes both sewage not containing rainwater and sewage containing rainwater.

The front filter machine S is configured so as to be able to capture impurities that are solids having a size exceeding the opening of the front filter machine S. The front grade machine S will be described in detail later.
The sand hoisting machine 3 is provided in the place of the sand settling part 1a provided by digging the bottom face of the water channel 1 on the downstream side of the front filtering machine S to a predetermined depth. This sand crusher 3 is configured such that sedimentary solids such as sand that has settled in the sand settling portion 1a can be scooped with a bucket and discharged to the outside.

  The rear screen 4 is a known rear screen (rear machine) provided on the downstream side of the sand raising machine 3 (sand sinking portion 1 a), and a plurality of screens extending in the vertical direction over the entire width of the water channel 1. The bars are configured to be parallel to each other at a predetermined interval and have a predetermined angle. The specific configuration of the screen after this is that the inclination angle of the screen bar is 60 °, which is the same as that of the front filter case S, but the opening between the screen bars is 25 mm, which is smaller than that of the front filter case S. Is formed. In addition, the rear screen 4 is provided with a lifting mechanism 4a having a scraper that automatically lifts the foreign matter captured by the screen bar, as in the known rear screen. Therefore, on the screen 4, the contaminants that could not be captured by the preceding front grader S can be captured from the sewage and the sewage from which the contaminants have been removed can be discharged to the pump (not shown) side. In addition, the above-mentioned numerical value is an example and does not limit this invention.

Hereinafter, the front filter machine S for carrying out the foreign matter processing method according to the present invention will be described with reference to FIGS. This front filter machine S is composed of a fixed screen bar body 10 and a movable screen bar body 20 corresponding to the front filter machine body of the present invention. 2 and 5, the fixed screen bar body 10 hits a portion indicated by a thick vertical line, and the movable screen bar body 20 hits a portion indicated by a white vertical line.

The fixed screen bar body 10 has a plurality of fixed screen bars B1, B1,... Extending in the vertical direction over the entire channel width of the water channel 1 and arranged in parallel at predetermined intervals, and has a predetermined inclination angle. Configured. Specifically, the cross-sectional shape is rectangular over the entire channel width of the channel 1 having 2 to 3 m (for example, the thickness on the side orthogonal to the flow of sewage is around 10 mm, and the length on the side parallel to the flow) A steel screen bar B1 having a rectangular cross-section of about 100 mm in length is arranged in parallel with an interval of 150 mm. These screen bars B1, B1,... Have an inclination angle of 60 ° with respect to the bottom surface direction of the water channel 1 so that the lower end side is located upstream of the water flow and the upper end side is located upstream of the water flow. Is provided. In addition, the above-mentioned numerical value is an example and does not limit this invention.
Further, the fixed screen bar body 10 is omitted for simplification of the drawing, but support bars for fixing the fixed screen bars B1, B1,... Are provided at the upper and lower ends of the fixed screen bar body 10, respectively. The fixed screen bars B1, B1,... Are configured so as to stably maintain a predetermined distance from each other.

When the fixed screen bar body 10 is viewed from the front, the fixed screen bars B1, B1,... Are cut out to form a rectangular opening 10a (see FIG. 5). The height of the opening 10a is determined so as to be higher than the water surface L when the amount of water is small as shown in FIG.
A stopper 12 is provided on a part of the upper part of the fixed screen bar B1 of the fixed screen bar body 10 (in the illustrated example, the upper part of the fixed screen bar B1 in the center), and a movable screen bar body 20 described later is provided. It is comprised so that the ascent movement of can be controlled.
In addition, although one fixed screen bar B1 located in the center of this opening 10a is left, this is for support of the roller mentioned later, and is equivalent to a part of guide bar of this invention. If the movable screen bar body 20 can be supported without the fixed screen bar B1, it can be omitted.

The movable screen bar body 20 has a rectangular shape when viewed from the front, and is configured to cover a rectangular opening 1 a provided at a lower portion of the fixed screen bar body 10. The movable screen bar body 20 is provided on the upstream side of the fixed screen bar body 10 so as to contact the fixed screen bar body 10.
Like the fixed screen bars B1, B1,..., The movable screen bar body 20 is configured by arranging a plurality of movable screen bars B2, B2,. Specifically, like the fixed screen bars B1, B1,..., The cross-sectional shape is rectangular (for example, the thickness on the side orthogonal to the sewage flow is about 10 mm, and the length on the side parallel to the flow is about 100 mm. The steel screen bar B1 having a rectangular cross-sectional shape is arranged in parallel with an interval of 150 mm. In addition, the above-mentioned numerical value is an example and does not limit this invention.
The upper and lower ends of the movable screen bars B2, B2... Are fixed by horizontal bars (crosspieces) B21 and B22, respectively, so that the movable screen bars B2, B2. In addition, a rigid fixed screen bar body 20 is formed.

  ... of the movable screen bars B2, B2 ... constituting the movable screen bar body 20, and the fixed screen bar body 10 side of the three movable screen bars B2, B2, B2 on both the left and right sides, the upper end portion and the height Rollers 21, 21,... Are respectively provided at the center in the vertical direction. A recess that is slightly larger than the width of the movable screen bar B2 in the longitudinal direction is provided at the center of the periphery of each roller 21. Each roller 21 is supported by a support shaft 21b on a bracket 21a fixed to the movable screen bar B2, and is configured to be placed on the upper surface in the longitudinal direction of the fixed screen bar B1 ( (See FIG. 4). In the present invention, among the fixed screen bar B1 on which the roller 21 is placed, there are fixed screen bars B1 and B1 positioned on the left and right sides when the opening 10a is viewed from the front, and the fixed screen bar B1 positioned in the center. Since it has a role of guiding the roller 21, it is used as a guide bar.

Wires W and W are respectively provided on both sides of the horizontal bar B21 at the top of the movable screen bar body 20, and these wires W and W are hoisted by a motor provided on a stand at a high place. The wire is wound by the device M (see FIG. 1), and the wound wires W and W are rewound.
The wires W and W may be wound and rewound by a manual hoisting device.

  In FIG. 3, reference numeral 22 denotes a buffer member provided at the lower part of the movable screen bar body 20, which is devised so as to reduce the impact when the movable screen bar body 20 is lowered. 3 and 6, reference numeral 23 denotes a guide member that guides the movable screen bar body 20 so that the movable screen bar body 20 can reliably contact the fixed screen bar body 10 when the movable screen bar body 20 is lowered. 2 and 5 are omitted.

Next, the operation of the front grader S having the above configuration will be described. Assume that the gate 2 is open and the sand basin a is in operation. And the level of the sewage flowing through the water channel 1 is a water level L that is sufficiently lower than the position of the upper end of the opening 1a, as shown in FIGS. Suppose there is.
In this case, a switch provided on an operation panel (not shown) is turned on to drive the hoisting device M, the movable screen bar body 20 is raised, and the movable screen bar body 20 is shown in FIGS. As shown in FIG. As the movable screen bar body 20 rises, the foreign matter captured by the movable screen bar body 20 flows out to the rear screen 4 side. The contaminants sent to the rear screen 4 are then captured by the screen 4 and then automatically lifted by a lifting mechanism 4a having a scraper provided on the screen 4. Then, the scraped impurities are transported to a solids processing facility such as an incinerator through a transport mechanism such as a conveyor (not shown) and processed.

In the case of the water level L where the amount of water is small, such as during non-precipitation, the amount of contaminants flowing in the sewage is small, and even if the contaminants captured by the front filter S flow to the rear screen 4 side, The raking process can be performed without increasing the load on the rear screen 4.
After the foreign matter captured by the movable screen bar body 20 flows out to the rear screen 4 side, the movable screen bar body 20 is lowered as shown in FIGS.

  In addition, in the case of the water level L where the amount of water is small, such as during non-precipitation, the size of the contaminants flowing in the sewage is small, and the contaminants are rarely captured by the front filter machine S. The movable screen bar body 20 may be raised and placed until the water level flowing through 1 rises due to heavy rain or the like. In this case, since the time during which the movable screen bar body 20 is immersed in water is reduced, not only can the life of the movable screen bar body 20 be extended, but the movable screen bar body 20 can be positioned on the water surface. Therefore, the effect that maintenance becomes easy can be obtained.

  The sewage that has passed through the front filter machine S is settled in the sand settling part 1a in the same manner as the known sand settling basin, and the settling solids such as the settling sand are scooped up in a bucket and discharged to the outside. And the sewage which flowed from the sand settling part 1a is sent to the back screen 4, a foreign material is capture | acquired, and the sewage from which the foreign material was removed is made to flow out to the pump (not shown) side.

By the way, when the water level flowing through the water channel 1 rises due to heavy rain or the like, there is a possibility that large impurities that have stayed in the water channel 1 may be carried by the flow of sewage (rain water). When foreign substances flow, they are effectively captured by the front grader S. As described above, the foreign matter captured by the front grader S flows out to the rear screen 4 side when the water level L is low, such as during non-precipitation, and is then captured by the screen 4 and thereafter screen. After being lifted up automatically by a lifting mechanism 4a provided at 4, it is transported to a solids processing facility such as an incinerator and processed.
In the above-described example, the lifting / lowering operation of the movable screen bar body 20 is performed by turning on / off a switch provided on the operation panel. You may make it carry out automatically by predetermined information, such as information.

As described above, filtered rated motor S before according to the processing method of the contaminants present invention has a lift structure for raising and lowering the movable screen bar member 20, movable when small amount of water, such as during non-rainfall The screen bar body 20 is raised and the foreign matter captured is allowed to flow out to the rear screen 4 side, and then can be automatically lifted by the lifting mechanism 4a provided on the screen 4, so that the movable screen can be made with less equipment cost. The foreign matter captured by the bar body 20 can be scraped up automatically.

a …… Sedimentation basin 1 …… Water channel 1a …… Sedimentation part 2 …… Gate 3 …… Sanding machine 4 …… Rear screen
4a …… Screwing mechanism S …… Front filter machine 10 …… Fixed screen bar body 10a …… Open 12 …… Stopper 20 …… Movable screen bar body (front filter machine body)
21 …… Roller 22 …… Buffer member 23 …… Guide member B1 …… Fixed screen bar (guide bar)
B2 …… Movable screen bar W …… Wire M …… Hoisting device

Claims (3)

It provided downstream of the settling basin of a sewage treatment facility, and the screen after having a掻揚mechanism frying automatically scraping captured contaminants, provided upstream of the sand basin, contamination flowing to the settling basin A front filter machine having a front filter machine body having a predetermined opening larger than the opening of the rear screen that captures an object, and a lifting mechanism for moving the front filter machine body up and down; , A method for treating impurities , wherein
When the amount of water is low, such as during non-precipitation, the front filter machine main body is raised so that the foreign matter captured by the front filter machine flows out to the rear screen side, and then a lifting mechanism provided on the screen is provided. A method for treating impurities, which is used to scrape impurities . In the processing method of the contaminants according to claim 1, wherein the lifting mechanism, the front filtrate rated machine body located on the lower side is the upstream side of the water flow, provided with an upper side inclined located downstream side of the water flow A method for treating foreign matter, characterized in that it is placed on a guide bar and moves on the guide bar. In the processing method of the contaminants according to claim 2, wherein the pre-filtration rating machine body, the processing method of the contaminants, characterized in that it is intended to move through the rollers rolling on guide bar.

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