JP2000334225A - Sewage treatment car and sewage treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle to be exclusively used which treats the sewage containing the solid content reserved in a septic tank of a restaurant, etc., at a low cost. SOLUTION: This sewage treatment car is a vehicle mounted with a reaction chamber 2 for flocculating and reacting the sewage with a flocculating agent and a bag type gravity separator 4 having a filter bag 5 for filtering the sewage from the reaction chamber 2 and housing the solid content. A foul water sewer 21 movably installed in the reaction chamber 2 and a foul water sewer manipulation means 23 for manually and variably regulating the height position of the sewage suction and discharge port at the front end of the foul water sewer 21 are installed outside the reaction chamber 2. The sewage suction and discharge port of the foul water sewer 21 is moved by the foul water sewer manipulation means 23 to a place where the clean sewage of the low floc concentration of the sewage exists according to the distribution condition of the floc formed by the flocculation reaction in the reaction chamber 2 within the sewage. The vehicle is so constituted that the clean sewage is discharged from the foul water sewer 21 to parts exclusive of the filter bag 5 and the high-concentration sewage of the high concentration of the floc remaining in the reaction chamber 2 is fed to the filter bag 5 and is thus filtered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment vehicle and a sewage treatment method for separating and removing solids from sewage containing solids such as kitchen garbage.

[0002]

2. Description of the Related Art In large-scale restaurants and school lunch facilities, a large amount of sewage containing a large amount of solids such as kitchen garbage is produced. Conventionally, such sewage is connected to a sewage connected to a drain of the facility. Once stored in a tank, the entire amount is sucked into the sewage tank of a vacuum car of a treatment company as industrial waste and transported to a sewage treatment plant for treatment.

[0003]

In this type of conventional sewage treatment method, since the entire amount of sewage is transported by a vacuum car, the transportation cost is higher than the direct treatment cost at the sewage treatment plant. ing.

[0004] It is an object of the present invention to provide a sewage treatment vehicle and a sewage treatment method capable of reducing expensive transportation costs.

[0005]

A sewage treatment vehicle according to the present invention comprises a reaction tank for adding flocculants to sewage containing solids sucked up by vacuum suction to generate flocs of solids, A bag-type gravity separation device is provided in which a filter bag for introducing and discharging wastewater containing by gravity is detachably stored and held.

Here, the reaction tank mounted on the cargo bed may be similar to a vacuum type sewage tank, and a flocculant (aggregate) is added to the sewage contained in the reaction tank to actively floc solids. The floc is generated by blowing compressed air into the wastewater if necessary. As the filter bag to which the wastewater subjected to the coagulation reaction in the reaction tank is supplied, a cloth bag for filtering the floc component from the wastewater by gravity is appropriate. Comprehensive sewage treatment by discharging relatively clean filtered water (clarified sewage) with a small amount of floc components out of the vehicle from the filter bag and treating the floc components remaining in the filter bag as general garbage waste. Cost is reduced.

[0007] The invention according to claim 2 of the present invention is characterized in that the sewage which is movably installed at a fixed position in the side wall of the reaction tank and which is located at a desired height position in the sewage in the reaction tank is removed. A sewage pipe for discharging to the outside, and a sewage pipe operating means movably installed outside the side wall of the reaction tank to manually variably adjust the height position of the sewage suction / discharge port at the tip of the sewage pipe in the reaction tank. The height position of the sewage suction / discharge port of the sewage pipe is manually adjusted by the sewage pipe operating means in accordance with the floc distribution in the sewage in the reaction tank.

[0008] The floc distribution state of the sewage in the reaction tank here varies depending on the kind of solid contained in the sewage, the condition of the coagulation reaction in the sewage reaction tank, and the like. The situation in which flocks float near the surface of sewage,
This is the situation where flocs settle under the wastewater in the reaction tank. In response to the floc distribution situation, the sewage pipe operating means moves the sewage inlet / outlet of the sewage pipe to, for example, a level where relatively clean sewage (clarified sewage) having a low floc concentration exists, or conversely, the sewage pipe. The sewage suction / discharge port is moved to a level where high-concentration sewage having a high floc concentration is present, whereby sewage is selectively discharged from the reaction tank according to the floc concentration. For example, clear sewage with a low floc concentration discharged from the reaction tank through a sewage pipe is discharged to an external sewage tank or the like without supplying it to the filter bag, and only high-concentration sewage with a high floc concentration is supplied from the reaction tank to the filter bag. By using the liquid, the amount of sewage filtration is reduced, sewage filtration can be performed efficiently and in a short time, and sewage treatment cost can be reduced. Such a sewage treatment method corresponds to claims 7 and 8 of the present invention.

According to a third aspect of the present invention, the sewage pipe is vertically formed on a wall surface of the reaction tank so that a vertically moving sewage suction / discharge port of the sewage pipe can be seen from a water level gauge through which sewage in the reaction tank can be seen. In addition, it is characterized by being installed in the vicinity of a water level gauge of a reaction tank. By disposing the sewage pipe near the water level gauge of the reaction tank in this way, the height position of the sewage suction and discharge port of the sewage pipe in the reaction tank and the floc concentration of sewage around the sewage suction and discharge port can be visually checked. The manual operation of the sewage pipe can be performed accurately.

According to a fourth aspect of the present invention, the wastewater pipe is rotatably penetrated through a side wall of the reaction tank and is connected to a base end portion connected to a substantially horizontal swivel joint outside the side wall of the reaction tank. A bent portion that is bent into a substantially L shape from the base end into the reaction tank and rotates integrally with the base end so that the waste water suction / discharge port at the tip pivots up and down in the reaction tank; Rotary sewage pipe operating means for rotating the sewage pipe through a swivel joint by rotating the swivel joint in the vertical direction is connected to the swivel joint at the base end of the pipe. The sewage pipe here is an L-shaped pipe, and the sewage pipe operating means is a rod-like lever or an annular handle that rotates integrally with the sewage pipe.

According to the invention of claim 5 of the present invention, a part of the sewage pipe operating means always has a height position corresponding to a sewage suction / discharge port of a sewage pipe in a reaction tank, and the height position is visually determined. It is characterized by providing a height mark to be confirmed. The height mark of the sewage pipe operation means here is a projection, a hole, a bending point, a marked point of a conspicuous color, or the like, which forms a part of the sewage pipe operation means in a conspicuous shape. By doing so, the position of the sewage suction / discharge port of the sewage pipe in the reaction tank can be confirmed, and accurate work of adjusting the position can be easily performed.

In the invention according to claim 6 of the present invention, the sewage pipe operating means is an operating lever extending in a radial direction from the swivel joint, and a height mark which is bent differently from the other is formed at an intermediate portion of the operating lever. It is characterized by the following. The operating lever here is a rod-shaped lever that is bent in one place, and the one bending point serves as a height mark.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIGS. The sewage treatment vehicle shown in FIGS. 1 and 2 is equipped with a reaction tank 2, a crane 3, and a bag-type gravity separator 4 on a carrier 1 in this order from the front side.

The reaction tank 2 is an elliptical tank provided with vacuum means, and a hose reel 11 and the like are provided on the upper surface thereof. A vertically long water level gauge 12 and a hatch type viewing window 13 are provided on the side wall of the reaction tank 2. The water level gauge 11 is a transparent window from which the water level and flocking status of the sewage contained in the reaction tank 2 can be visually confirmed from the outside, and is formed continuously from the upper part to the lower part of the reaction tank 2. On the side wall of the reaction tank 2 near the water level gauge 12,
The sewage pipe 21 and the sewage pipe operating means 23 as shown in FIGS. 3 and 4 are movably installed. The sewage pipe 21 is a movable pipe for sucking and discharging sewage into and out of the reaction tank 2, and the sewage pipe operation means 23 manually adjusts the height position of the sewage suction and discharge port 22 at the tip of the sewage pipe 21 in the reaction tank 2. It is a rod-shaped operating lever or an annular rotating handle.

FIG. 5A shows the inside of the reaction tank 2.
A vertical pipe 31 and a horizontal pipe 32 as shown in (B) are installed, and a diffuser 33 is connected to a plurality of locations of the horizontal pipe 32. The horizontal pipe 32 is installed near the bottom of the reaction tank 2, and the center of the horizontal pipe 32 communicates with the lower end of the vertical pipe 31. The flocculant (coagulating liquid) or compressed air selectively pumped from the outside to the vertical pipe 31 is sent from the horizontal pipe 32 to the diffuser 33 and diffused from the diffuser 33 into the sewage in the reaction tank 2.

The crane 3 is of an automatic revolving and retractable type that revolves right and left and expands and contracts up and down. The tip of a liquid supply hose connected to the reaction tank 2 is connected to a plurality of filtration bags 5 of a bag type gravity separator 4. It is used for moving the filter bag 5 back and forth, right and left, and for loading and unloading individual filter bags 5.

FIG. 6A shows a bag-type gravity separator 4.
As shown in (B) and (C), this corresponds to a total of 4
A bag storage box 41 with an upper lid in which two filtration bags 5 are stored;
It has a frame-shaped bag support 42 that individually supports the filtration bags 5. The filter bag 5 is a cloth bag having a bottomed upper end that is incinerated and disposed of together with the solid content after filtering sewage, and a tie tape (not shown) for manually closing the upper end opening and a rubber hook described later. 45 are sewn. The filtration bag 5 is loaded onto the bag support 42 by the crane 3 in a state of being detachably housed in the outer bag 43 in the form of a cylindrical mesh bag. At 3, it is dropped out of the vehicle. The outer bag 43 is a mesh bag for holding the accommodated filter bags 5 in a cylindrical shape, and is used repeatedly for a plurality of filter bags. The bottom of the outer bag 43 is manually opened, and a hanging hook 44 suspended by the crane 3 is fixed to the upper opening of the outer bag 43. Hanging hook 44
The rubber hook 45 extended from the opened upper end of the filter bag 5 is hooked on the filter bag 5, and the upper end of the filter bag 5 is held open. A passage 46 for an operator to enter is formed between the left and right bag storage boxes 41, and an operator enters the passage 46 to perform operations such as attaching and detaching the outer bag 43 and the crane 3.

A coagulation liquid tank 51 is provided at the upper front of the bag storage box 41, and a washing water tank 52 is provided below the coagulation liquid tank 51. Then, the coagulation liquid in the coagulation liquid tank 51 is supplied into the reaction tank 2, and the cleaning water in the cleaning water tank 52 is supplied into the reaction tank 2.

A specific example of the sewage pipe 21 and the sewage pipe operating means 23 installed in the reaction tank 2 will be described with reference to FIGS. The sewage pipe 21 is a bent pipe movably installed at a fixed position slightly below the intermediate position in the reaction tank 2, and includes a base end 21 a rotatably penetrating the side wall of the reaction tank 2, and a base end 21 a. L-shaped bent portion 21b extending into the reaction tank 2 from the
The opening at the end of b is a sewage suction / discharge port 22. Reaction tank 2
The base end 21a protruding outside the swivel joint 24
And the sewage pipe operating means 23 is connected to the swivel joint 24. The sewage pipe 21 is connected to the water level meter 12 of the reaction tank 2.
The position of the sewage suction / discharge port 22 that moves upward and downward by the vertical rotation of the bent portion 21b from the water level gauge 12 can be easily observed visually.

The sewage pipe operating means 23 is, for example, a single L-shaped operating lever 23 extending in a radial direction from the swivel joint 24. The operating lever 23 and the distal end portion of the bent portion 21b of the sewage pipe 21 have a positional relationship of being substantially parallel to each other, and the height of a bending point P provided at one point in the middle of the operating lever 23 corresponds to the sewage suction / drain port of the sewage pipe 21. The bending point P always coincides with the height of the pipe 22 and serves as a height mark 25 for visually confirming the height position of the sewage suction / discharge port 22 of the sewage pipe 21 in the reaction tank 2.

The swivel joint 24 is operated by the operation lever 23.
When the base end 21a of the sewage pipe 21 is rotated through the, the operation lever 23 and the distal end of the bent portion 21b rotate up and down integrally, and the height of the sewage suction / discharge port 22 in the reaction tank 2 is increased. It is visually confirmed with a mark 25. As shown by the solid line in FIGS. 3 and 4, when the operating lever 23 is manually rotated and moved below the swivel joint 24, the distal end of the bent portion 21b of the sewage pipe 21 faces downward, and the sewage suction / discharge port 22 faces downward. When the operating lever 23 is manually rotated upward by 90 degrees or more as shown by the chain line in FIGS. 3 and 4, the tip of the bent portion 21b is turned upward, and the sewage suction / discharge port 22 is turned upward. And the height position approaches the upper limit position. Such vertical movement adjustment of the sewage suction / discharge port 22 by manual operation of the operation lever 23 is performed while observing the floc distribution state of the sewage in the reaction tank 2 from the water level meter 12. Is carried out in a position which is considered to be most appropriate for sewage treatment.

Next, the sewage treatment operation of the entire vehicle will be described with reference to the overall piping diagram of FIG. The vehicle is moved to the sewage tank 6 of a restaurant or the like, and the hose 61 fed from the hose reel 11 is extended to the sewage containing the solid content stored in the sewage tank 6, and the suction and discharge valves 62 and 63 are opened to open the reaction tank 2.
Vacuum sewage into it. Next, the suction and discharge valves 62 and 63 are closed, and the coagulation liquid is injected into the wastewater in the reaction tank 2. The condensed liquid is sent under pressure from the vertical pipe 31 of FIG. 5 to the diffuser 33 of the horizontal pipe 32 and is dispersed in the sewage. Next, compressed air is injected into the sewage through the same vertical pipe 31 and horizontal pipe 32. As a result, the flocculant and the sewage are vigorously stirred, the solids in the sewage are efficiently aggregated to generate flocs, and the generated flocs float near the surface of the sewage.

When the floc distribution state of the sewage in the reaction tank 2 is such that flocs 8 in which solids are aggregated near the surface of the sewage 7 as shown in FIG. 12, the operation lever 23 is lowered to position the sewage suction / discharge port 22 of the sewage pipe 21 at the intermediate position of the sewage 7 or slightly below the intermediate position, and this position is set at the height mark 25 of the bending point P of the operation lever 23. Check visually with. In this state, the suction and discharge valves 62 and 63 in FIG. 7 are opened to make the space pressure in the reaction tank 2 a positive pressure, and the sewage 7 is discharged from the sewage pipe 21 to the sewage tank 6 with this positive pressure. Sewage discharged 7
Is a relatively clean clarified sewage having almost no flocs 8 of the sewage 7 in the reaction tank 2, and after being returned to the sewage tank 6, is treated as ordinary tap water. The sewage flowing through the various pipes shown in FIG. 7 is classified into two types: clarified sewage having a low floc concentration which does not require sewage treatment, and high-concentration sewage having a high floc concentration which requires sewage treatment. The flow of sewage,
Solid arrows indicate the flow of highly concentrated sewage.

As the drainage of the sewage in the reaction tank 2 progresses and the sewage pipe 21 approaches the state where the floc starts to be sucked, FIG.
The two-way valve 64 and the discharge valve 66 of the drain pipe 14 connected to the bottom of the reaction tank 2 are closed.
Is opened, and sewage having a high floc concentration in the reaction tank 2 is supplied to the filtration bag 5 through the see-through tube 65. The see-through tube 65 is used for visual monitoring of sewage supplied to the filtration bag 65. FIG. 8 (C) shows the state of liquid supply at this time. High-concentration sewage 7 having a large amount of floc 8 accumulated at the bottom of the reaction tank 2 is supplied to the filter bag 5 together with the floc 8. When the high-concentration sewage 7 is fully supplied to one filter bag 5, it is supplied to the next filter bag 5.
The high-concentration sewage 7 supplied to the filtration bag 5 is filtered by the filtration bag 5, and only the filtrate of the clarified sewage flows down to the sewage tank 67.
Only the solid content of the floc component remains in the filter bag 5 after being filtered. The clarified sewage flowing down to the sewage tank 67 is returned to the sewage tank 6 by opening the discharge valve 69 of the sewage pump 68 and operating the sewage pump 68.

The sewage collected in the sewage tank 6 as described above is sucked into the reaction tank 2 and actively undergoes agglutination reaction. During the agglutination reaction, clear sewage is selected and returned to the sewage tank 6. 2
By supplying only the high-concentration sewage with high floc concentration remaining in the filter bag 5 and filtering, the amount of sewage filtered by the filter bag 5 is greatly reduced, and the filtration time is shortened by the reduced amount. As a result, total wastewater treatment costs can be reduced. When all the high-concentration sewage in the reaction tank 2 is supplied to the filter bag 5, the sewage pump 68 is stopped, and the vehicle is driven from the sewage tank 6 to a garbage incineration plant or the like. Filtration of high-concentration sewage by the bag 5 can be continued, and in this way, sewage treatment costs can be further reduced.

When the vehicle arrives at the garbage incineration plant or the like, the outer bag 43 is lifted together with the filter bag 5 by the crane 3 in FIG. 1 and moved to the side of the vehicle, where the bottom of the outer bag 43 is opened. The filtration bag 5 falls from the outer bag 43. The concentrated solids stored in the filter bag 5 are incinerated together with the filter bag 5 at low cost in the same manner as general garbage.

The floc distribution state of the sewage which is sent from the sewage tank 6 of FIG. 7 to the reaction tank 2 and causes the flocculation reaction is various, and for example, the floc 8 sinks in the sewage 7 as shown in FIG. There are cases. In such a case, since the vicinity of the surface of the sewage 7 is clear sewage having a low floc concentration, the operation lever 23 is rotated upward so that the sewage suction / discharge port 22 of the sewage pipe 21 is positioned above the sewage 7. As the clarified sewage of the sewage 7 is discharged and the water surface is lowered, the sewage suction / discharge port 22 is gradually lowered by the operation lever 23 so that only the clarified sewage from the sewage 7 is returned to the sewage tank 6.

Although not shown, the floc may move up and down irregularly or periodically in the sewage in the reaction tank 2. In such a case, the floc moves from the water level meter 12 to the floc. What is necessary is to visually observe the situation one by one and move the sewage suction / discharge port 22 of the sewage pipe 21 up and down so as to avoid flock.

Further, depending on the type of sewage, the sewage pipe 21 and the filtration bag 5 installed at a substantially intermediate position of the reaction tank 2 are connected to piping (not shown) by a suction and discharge valve, and the sewage suction and discharge port 22 of the sewage pipe 21 is connected. It is also possible to move the sewage with a large amount of flocs to the filter bag 5 from the sewage pipe 21 by moving the sewage to a position with a high floc concentration in the sewage. In this case, finally, the clarified sewage having a low floc concentration remains in the reaction tank 2, and the remaining clarified sewage is discharged from the bottom of the reaction tank 2 to an external sewage tank or the like, and is not supplied to the filter bag. Even in this case, the amount of sewage filtered by the filter bag is greatly reduced, and the total cost of sewage treatment can be reduced.

[0030]

According to the first aspect of the present invention, sewage in a sewage tank of a restaurant or the like is subjected to a coagulation reaction in a reaction tank of a vehicle in a short time to separate solid components, and the sewage is filtered by a filter mounted on the vehicle. The solid content remains in the filter bag after being filtered by the bag, and the remaining solid content can be incinerated at low cost in the same manner as general garbage, so that the total treatment cost of the entire wastewater can be reduced. In addition, only high-concentration sewage containing a high solid content is supplied from the reaction tank to the filtration bag, and relatively clean clarified sewage separated from the solid content is discharged out of the filtration bag. By that
It is possible to provide a small-sized sewage treatment vehicle having a high sewage treatment capacity by reducing the substantial volume of the reaction tank and the overall size.

According to the second aspect of the present invention, the height position of the sewage suction / discharge port of the sewage pipe is manually adjusted by the sewage pipe operating means in accordance with the floc distribution in the sewage in the reaction tank.
The sewage pipe operating means moves the sewage suction and discharge port of the sewage pipe to, for example, a relatively high level of relatively clean clarified sewage having a low floc concentration, or conversely, moves the sewage suction and discharge port of the sewage pipe to a high concentration of floc concentration. By moving the sewage to a certain height, the sewage can be selectively discharged from the reaction tank according to the floc concentration, and various types of sewage can be efficiently treated. For example, clarified sewage with a low floc concentration discharged from the reaction tank through a sewage pipe is discharged to an external sewage tank or the like without supplying it to the filter bag, and only the high-concentration sewage with a high floc concentration remaining in the reaction tank is discharged. Is supplied to the filter bag, the amount of sewage to be filtered can be greatly reduced, and the filtration required for one sewage treatment can be performed efficiently and in a short time, and the cost of sewage treatment can be reduced. Becomes

According to the third aspect of the present invention, it is possible to visually check the state of floc distribution of sewage in the reaction tank and the sewage inlet / outlet of the sewage pipe from the water level gauge of the reaction tank, and to cope with the state of floc distribution of sewage. Up and down manual operation of the sewage pipe can be performed easily and accurately.

According to the fourth aspect of the present invention, a simple and low-cost structure such as a rod-shaped lever or an annular handle that only rotates the swivel joint of the sewage pipe can be applied to the sewage pipe operating means.

According to the fifth aspect of the present invention, by visually checking the height mark formed on a part of the sewage pipe operating means, the height position of the sewage suction / discharge port of the sewage pipe in the reaction tank can be immediately confirmed. This makes it possible to easily perform the position adjustment accurately.

According to the sixth aspect of the present invention, the operating lever whose sewage pipe operating means extends in the radial direction from the swivel joint is excellent in manual rotation operability, and the operating lever is bent at an intermediate position to provide a height mark and By doing so, the height mark becomes clear and visual confirmation of the height of the sewage inlet / outlet of the sewage pipe in the reaction tank can be made clear.

[Brief description of the drawings]

FIG. 1A is a side view of a main part showing an embodiment of a sewage treatment vehicle according to the present invention, and FIG. 1B is a rear view of the reaction tank of FIG.

FIG. 2 is a plan view of the vehicle shown in FIG. 1;

FIG. 3 is an enlarged side view including a partial cross section of a reaction tank in the vehicle in FIG. 1;

FIG. 4 is a front view of the drainage pipe operating means of FIG. 3;

FIG. 5 (A) is a side view of the piping inside the reaction tank, (B)
Is a rear view of the piping.

6A is a plan view of a bag-type gravity separation device in the vehicle of FIG. 1, FIG. 6B is a front view, and FIG. 6C is a front view of a filter bag support structure.

FIG. 7 is a piping diagram of the entire vehicle in FIG. 1;

FIGS. 8A and 8B are cross-sectional views showing various treatment states of sewage in a reaction tank, wherein (A) and (B) show discharge of clarified sewage with low floc concentration, and (C) show discharge of high-concentration sewage with high floc concentration. FIG.

[Explanation of symbols]

 Reference Signs List 1 loading bed 2 reaction tank 4 bag type gravity separator 5 filtration bag 6 sewage tank 7 sewage 8 frock 12 water level gauge 21 sewage pipe 21a base end 21b bent portion 22 sewage suction / discharge port 23 sewage pipe operating means, operation lever 24 swivel joint 25 Height mark P Bending point

Continued on the front page (72) Inventor Ken Mamiya 1-48 Jinmucho, Yao-shi, Osaka Morita Econos Co., Ltd. (72) Inventor Masahiko Tokunaga 1-48 Jinmucho, Yao-shi, Osaka F-term in Morita Econos Co., Ltd. (Reference) 4D041 AA13 AA16 AB05 AD01 AD09 AD10 CB08 CC08 4D062 BA23 CA04 EA36

Claims (8)

[Claims] 1. A reaction tank for adding flocculants to wastewater containing solids sucked up by vacuum suction to generate flocs of solids, and a filter bag for introducing wastewater containing flocs and discharging by gravity. A sewage treatment vehicle equipped with a bag-type gravity separator that is detachably stored and held. 2. A sewage pipe movably installed at a fixed position in a side wall of the reaction tank to discharge sewage at a desired height in sewage in the reaction tank to the outside of the reaction tank. Sewage pipe operating means which is movably installed outside the side wall of the sewage pipe and manually variably adjusts the height position of the sewage suction / discharge port at the tip of the sewage pipe in the reaction tank, and the distribution of flocs in the sewage in the reaction tank. The sewage treatment vehicle according to claim 1, wherein the height position of the sewage suction / discharge port of the sewage pipe is manually adjusted by the sewage pipe operation means in accordance with the situation. 3. The water level meter of the reaction tank is formed so that the sewage pipe is vertically formed on the wall surface of the reaction tank so that the vertically moving sewage suction / drain port of the sewage pipe can be viewed from a water level meter that can see sewage in the reaction tank. 3. The sewage treatment vehicle according to claim 2, wherein the sewage treatment vehicle is installed in the vicinity. 4. A base end portion rotatably penetrating through a side wall of the reaction tank and connected to an axially substantially horizontal swivel joint outside the side wall of the reaction tank. A bent portion that bends into a substantially L-shape and rotates integrally with the base end so that the sewage suction / discharge port at the tip has a bent portion that pivots up and down in the reaction tank, and the swivel at the base end of the sewage pipe. The sewage treatment vehicle according to claim 2 or 3, wherein a rotary sewage pipe operating means for rotating the sewage pipe through a swivel joint by rotating the joint vertically is connected to the joint. 5. A part of the sewage pipe operating means is provided with a height mark which is always coincident with the height position of the sewage suction / discharge port of the sewage pipe in the reaction tank and whose height position is visually confirmed. 5. The sewage treatment vehicle according to claim 4, wherein: 6. The sewage pipe operating means is an operating lever extending in a radial direction from the swivel joint, and a height mark is formed at an intermediate portion of the operating lever so as to be bent so as to be distinguishable from other portions. The sewage treatment vehicle according to claim 5, wherein 7. A reaction tank for adding flocculants to sewage containing solids sucked up by vacuum suction to generate flocs of solids, and a filter bag for introducing sewage containing flocs and discharging by gravity. In a sewage treatment vehicle equipped with a bag-type gravity separation device housed detachably, sewage is movably installed at a fixed position in the side wall of the reaction tank and located at a desired height position in the sewage in the reaction tank. And a sewage pipe operating means movably installed outside the side wall of the reaction tank to manually and variably adjust the height position of the sewage suction / discharge port at the tip of the sewage pipe in the reaction tank. And manually move the sewage pipe operating means to move the sewage suction and discharge port of the sewage pipe to a position with a low floc concentration in the sewage in the reaction tank, and filter only clear sewage with a low floc concentration from the sewage pipe. Sewage treatment method characterized by being discharged outside the bag . 8. A reaction tank for adding flocculants to sewage containing solids sucked up by vacuum suction to generate flocs of solids, and a filter bag for introducing sewage containing flocs and discharging by gravity. In a sewage treatment vehicle equipped with a bag-type gravity separation device housed detachably, sewage is movably installed at a fixed position in the side wall of the reaction tank and located at a desired height position in the sewage in the reaction tank. And a sewage pipe operating means movably installed outside the side wall of the reaction tank to manually and variably adjust the height position of the sewage suction / discharge port at the tip of the sewage pipe in the reaction tank. By moving the sewage inlet / outlet of the sewage pipe to a position with a high floc concentration in the sewage in the reaction tank by manual operation of the sewage pipe operation means, only the sewage with a high floc concentration from the sewage pipe is filtered. Sewage treatment characterized by feeding and filtering water .