JPH10272493A - Treatment of sewage and its treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate suspended solids(SSs) and to easily and efficiently recover the SSs by adjusting the pH of the sewage, miscellaneous drainage, etc., from such as household, food industry and agricultural and industrial use. SOLUTION: This treatment method for the sewage consists in subjecting the sewage, etc., to pH adjustment with metal soap, such as slaked lime, to generate the insoluble SSs and treating the SSs by a physical treatment of a backwashing type. The treating device has a drum 3 of a horizontal type which is internally vertically formed with a filter tank 1 consisting of filter media to recover the SSs and a space section 2, a first inflow pipe 5 for the inflow of raw water commonly used for the outflow of the sewage of which the first inflow section 4 for the inflow of the raw water commonly used for the outflow of the sewage exists in the space section from its axial central part and a second inflow pipe 7 for the inflow of filtrate water commonly used of the outflow of washing water of which a second inflow section 6 for the inflow of filtrated water commonly used for the outflow of the washing water exists in the filter tank from its axial central part. Plate filter nets 8, such as wedge wires, which are rotationally supported by means of rails 50 and rollers 51 on the outer periphery of the drum and are communicated with the second inflow section 6 for the inflow of the filtrated water commonly used for the outflow of the washing water is installed to the device. Means for cleaning the rear surfaces of the filter nets 8 and preventing the adhesion of algae, etc., following up the rotation of the drum are installed between the filter nets 8 and the inside wall surfaces of the drum 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the pH of sewage such as domestic sewage / miscellaneous effluent, food industrial water, agricultural / fishing, industrial water, etc., to generate suspended solids, and to subject the suspended solids to backwashing physical treatment. The present invention relates to a method for processing by filtration and a processing apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, domestic wastewater, food industry, agriculture,
Wastewater such as fisheries / industrial water / wastewater / miscellaneous wastewater contains oil, starch, protein, etc., so water is used as a representative builder by adjusting the pH of caustic soda etc. to impart alkalinity. Due to sodium oxide, oil and sodium hydroxide become soap and glycerin.Since this soap is weakly alkaline, it chemically converts fats and oils to soluble, and also disperses the fats and oils into small droplets and emulsifies them with a less sticky liquid. I do. Also, since the soap solution is a viscous liquid, it physically removes dust by adsorbing it.Thus, due to these actions, physical filtration could not be performed, and the sedimentation treatment was performed using a sedimentation tank. The larger the number of such sedimentation tanks, the larger the installation area and the more difficult it is to manage and repair. In addition, a biological treatment tank is required even for a membrane treatment device that is a kind of physical filtration device, and the cost increases due to the membrane treatment device and the biological treatment tank. Therefore, even if this biological treatment tank is eliminated, an activated carbon treatment device is required as a post-treatment, or a coagulation treatment device is required in place of the pretreatment biological treatment tank. Cleaning of these various processing devices is inadequate, large amounts of washing water and time are required for cleaning the filter media, and a device for collecting suspended solids is complicated and various tanks are required. However, there is a disadvantage that the size is increased. In addition, as the above-mentioned representative builder, sodium sulfate (Na ₂ S
O ₄ ), various types of sodium phosphate (1 example) (Na ₃ PO
₄ · _12H 2 O), sodium hydroxide (NaOH), sodium sesquicarbonate _{(NaCO 3} · NaHCO 3 · 2H
₂ O), various types of sodium silicate (1 example) (NaSi
O ₂ ) and carboxymethyl cellulose (CMC).

[0003] Further, there is a treatment method in which a protein flocculant is added after the pH of marine wastewater is adjusted, followed by high-speed stirring to separate the flocculated proteins (Japanese Patent Publication No. 55-6435). However, high-speed stirring and recovery thereof are very difficult. It is. In addition, BOD, CO is removed from the organic wastewater to which the pH is adjusted or a coagulant is added.
In order to remove D, NH (normal hexane soluble substance or oily substance) and suspended solid substances, this treated wastewater is ejected under pressure into a jet ejector, and the ejected liquid forms a reduced pressure state. A device which is dropped on the water surface while inhaling air and inhaling a polymer flocculant solution under the air to separate suspended solid matter by floating (Japanese Patent Publication No. 7-1213).
No. 87), but it is also difficult to recover them. Further, as disclosed in Japanese Patent Publication No. 7-41255, various treatment tanks are provided in a vertical direction, so that the conventional 3
Although it is intended to cover an area of about 0%, as described above, the washing of the filter medium is insufficient, the washing of the filter medium requires a large amount of washing water and time, and such a device is used. There is a disadvantage that it is complicated and large. JP-A-6-2697
No. 99 and Japanese Patent Publication No. 7-102358, etc., in which soluble phosphorus is immobilized, or coagulated water is subjected to membrane filtration to return treated water to a coagulation tank or a storage tank.
The disadvantage is that these devices are complicated and large.

[0004] The inventors of the present application have previously increased the filtration efficiency by enlarging the area of the filter net and, at the same time, sliding the filter medium into contact with the filter medium during backwashing, thereby making it easier for the dirt and suspended matter adhering to the filter net to come into contact. We have proposed a rotary backwash type filtration device that can destroy and remove objects and the like, and can wash the filter medium with less washing water, which is about 1/10 that of a conventional fixed type backwash type filtration device. In addition, the filter net is a wedge wire, which causes the rubbing of the granular filter media inside the drum during washing, without destroying the granular filter media, and making the collected suspension more easily and easily. A filtration device that can be removed almost completely has also been proposed. In addition, since there is no gap between the inner wall of the drum and the back of the filtration net, and it is not intended to wash the back of the filtration net, filth may inevitably arrive on the back of the filtration net during long-term use, or algae or the like may adhere. This was a cause of mold and the like. Therefore, even when filtration is performed between the plate-shaped filtration net and the inner wall of the drum, the filter has a self-cleaning function of the back surface of the filtration net and a function of preventing adhesion of algae, etc. We have proposed a filtration device that prevents this and automatically cleans by rotating the drum even if dirt etc. adhere. Therefore, since household wastewater contains oil, starch, protein, etc., the pH is adjusted with a metal soap such as slaked lime to generate insoluble floating substances, and the floating substances are converted to the above-mentioned rotary type. It has been found that the treatment can be efficiently performed by various backwashing filtration means.

[0005]

First, there is no need for a large-scale sedimentation tank as in the prior art, and the size of the large-scale sedimentation tank can be reduced or eliminated by employing physical filtration means. Even if the tank is not necessarily required and used, the same treatment scale can be greatly reduced by about one-third compared to the conventional one, and the pH of wastewater, which was considered impossible by physical filtration, can be adjusted to reduce insoluble suspended solids. Provided is a method for treating wastewater that generates and easily physically treats the suspended matter. Second, it does not require a large-scale sedimentation tank as in the prior art, and uses a physical filtration means to reduce or eliminate the need for a large-scale sedimentation tank, and does not necessarily require a biological treatment tank. Sewage that is considered to be impossible by mechanical filtration, pH is adjusted with metal soap such as slaked lime to generate insoluble suspended solids, and the suspended solids are physically treated by a simple rotary backwash filtration. To provide a processing method. Third, in addition to the first or second problem, a method for treating wastewater that can be used for service water or municipal water simply by sterilizing after treating in a preliminary sedimentation tank and a biological treatment tank that is greatly reduced as necessary. To provide. Fourth,
To filter suspended substances, etc., increase the filtration area by increasing the area of the filtration network, and at the same time, rub the filter media together during backwash to separate the deposits from the filter media and completely restore the filter media. Adhered dirt and suspended matter can be destroyed and removed, and it is almost 1 /
Provided is a sewage treatment apparatus capable of washing a filter medium with as little as 10 washing waters and recovering suspended solids reliably and efficiently. Fifth, in addition to the fourth problem, a plate-like filtration network is provided in the filter tank and the space, so that double filtration of coarse filtration and filtration in the filter tank can be performed. Provided is a sewage treatment apparatus for automatically washing adhered substances to these plate-shaped filtration nets during washing. Sixth, in addition to the fourth or fifth problem, one or both of a first flowing pipe for raw water inflow and sewage outflow and a second flowing water pipe for infiltration inflow and washing water outflow are provided with a horizontal drum. The present invention provides a wastewater treatment apparatus that can be made more compact because it has no or no dead space in the drum because it is disposed outside the drum. Seventh, in addition to any of the fourth to sixth problems, the filter has a self-cleaning function of the back surface of the filtration network and a function of preventing adhesion of algae and the like even when filtering between the inner walls of the drum, so that dirt, algae and the like can be prevented. Provide a more reliable and clean sewage treatment device because it is a processing device that prevents the adhesion of molds and molds, and automatically cleans by rotating the drum even if dirt is attached. .
Eighth, in addition to the seventh object, to provide a sewage treatment apparatus that can always keep clean by mixing or covering an antifouling agent in the adhesion preventing means. Ninth, fourth to eighth
In addition to any of the above-mentioned problems, a sewage treatment apparatus capable of cleaning the back of the filtration network for a long time without the need of cleaning for a long period of time and ensuring the prevention of deposits such as algae by simply mixing or covering the filtration network with a deterrent agent. To provide. Tenthly, in addition to any of the fourth to ninth problems, raw water and washing water are introduced or treated into a first flowing pipe for raw water inflow and sewage outflow or a second flowing water pipe for filtered water inflow and washing water outflow. A valve that opens fully when water and washing water flows out and becomes a throttle opening when sewage or washing water flows in is attached.
To provide a sewage treatment apparatus that automatically adjusts a flow rate and saves washing water. Eleventh, in addition to the tenth problem, to provide a sewage treatment apparatus capable of simplifying the structure of a valve and reducing adhesion of suspended matter. Twelfth, in addition to any of the fourth to eleventh problems, the mounting angle of the first flowing water pipe for raw water inflow and sewage outflow is set to approximately 90 degrees above the granular filter medium from the filter medium stable angle in the direction of rotation of the drum.
Provided is a sewage treatment apparatus capable of preventing the granular filter medium from flowing out even if the filter medium is rolled up due to collapse of the granular filter medium during backwashing. Thirteenth,
In addition to the fourth to twelfth problems, at least one rail is provided on the outer periphery of the drum, and the drum is supported by a roller provided with a guide for guiding the rail. An object of the present invention is to provide a sewage treatment apparatus that does not require a cam floor or the like on a drive unit side, can simplify a mechanism, and is free from trouble. Fourteenth, in addition to any of the fourth to thirteenth problems, the filter medium is prevented from entering a bearing portion of a water pipe supporting rotation of the drum, has a simple structure, and can withstand long-term use. Provide a durable sewage treatment device that is easy to maintain.

[0006]

In order to solve the above-mentioned problems, the present invention firstly adjusts the pH of sewage to generate insoluble suspended substances, and the suspended substances are subjected to backwashing physical filtration. A wastewater treatment method characterized by being treated. Second
The pH of the wastewater is adjusted with a metal soap such as slaked lime to generate an insoluble suspended substance, and the suspended substance is treated by a rotary backwashing filtration means. . Third, sewage is preliminarily stored in a sedimentation tank, and the pH is adjusted with a metal soap such as slaked lime to generate insoluble suspended substances, and the suspended substances are directly treated by a rotary backwashing filtration means. Then, the treated water is treated in a biological treatment tank as required, and then sterilized to make it into service water or tap water. Fourth, as the rotary backwashing filtration means, a horizontal drum in which a filter tank made of a granular filter medium and a space are formed in the vertical direction inside, and an axial center portion of the horizontal drum from outside. A first flow pipe for raw water inflow and sewage discharge in which the first flow section for raw water inflow and sewage discharge is located in the space; A second flowing water pipe for draining and inflowing the washing water, wherein the second flowing water section is located in the filtering tank, wherein the filtering tank rotates together with the horizontal drum in the filtering tank, A sewage treatment apparatus characterized in that a plate-shaped filtration network communicating with a second flowing water section for inflow and washing water outflow is provided. Fifthly, a plate-shaped filter net that rotates together with the horizontal drum in the filter tank and the space and communicates with the second flowing water section for inflow of filtrate and outflow of wash water is provided in the filter tank. The first for raw water inflow and sewage outflow in the space
The sewage treatment apparatus according to claim 4, further comprising a plate-shaped filtration network that communicates with the flowing water pipe. Sixth,
Either or both of the first flow pipe for raw water inflow and sewage discharge and the second flow pipe for filtrate inflow and washing water outflow are disposed outside the horizontal drum, and the distribution is in the filtration tank. 6. The sewage treatment according to claim 4, wherein the effluent is communicated with a first flowing section for raw water inflow and sewage outflow or a second flowing section for filtered water inflow and washing water outflow. Device. Seventh
In addition, a plate-shaped filtration network such as a wedge wire, which is rotated together with the horizontal drum and communicates with the second flowing water portion for the filtration water inflow and the washing water outflow, is provided in the filtration tank. 7. A method according to claim 4, further comprising a means for removing a deposit such as a brush for cleaning algae or the like on the back surface of the filtration net following the rotation of the drum between the net and the inner wall of the drum. The wastewater treatment device described in the above. Eighthly, the sewage treatment apparatus according to claim 7, wherein a deodorizing agent or the like is mixed or covered with the means for preventing attachments such as cleaning and algae. Ninth, the sewage treatment apparatus according to any one of claims 4 to 8, wherein a screening agent or the like is mixed or covered with the plate-shaped filtration net. Tenth
The first water pipe for raw water inflow and sewage outflow or the second water pipe for filtrate inflow and rinsing water outflow is provided with a valve which is fully opened at the time of raw water inflow or cleaning water outflow and becomes a throttle opening at the time of sewage outflow or filtration water inflow. 10. An apparatus according to claim 4, wherein said apparatus is provided.
The sewage treatment apparatus according to any one of the above. Eleventh
In the valve, a hole having a desired diameter is formed in the butterfly valve,
11. The function as a butterfly valve when fully opened at the time of raw water inflow or washing water outflow, and at the time of throttle opening at the time of sewage outflow or filtered water inflow, a small flow rate through a hole of a desired diameter. Wastewater treatment equipment. Twelfth
The angle of attachment of the first flowing water pipe for raw water inflow and sewage discharge is within a range of approximately 90 degrees in the rotation direction of the drum from the stable angle of the filter medium above the granular filter medium. A sewage treatment apparatus according to claim 11. Thirteenth, at least 1
The sewage treatment apparatus according to any one of claims 4 to 12, wherein a strip rail is provided and supported by a roller provided with a guide for guiding the rail.
Fourteenthly, a sandproof packing is attached to the inside of the first water pipe for raw water inflow and sewage discharge, which functions as an axis supporting the rotation of the horizontal drum. The sewage treatment apparatus according to any one of the above.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wastewater treatment method and a wastewater treatment apparatus according to the present invention will be described below with reference to the embodiments shown in FIGS. Sewage generally refers to wastewater of large and small stools, and wastewater from homes and the like is called miscellaneous wastewater. In the present invention, in addition to these wastewater and miscellaneous wastewater, food industry, agriculture,
In the following, including wastewater from industrial water, etc.,
That. Such sewage is generally subjected to various treatments as shown in Table 1 before being discharged or reused as middle water or the like. However, these require a large-scale sedimentation tank, and a biological treatment tank is required even for a membrane treatment device that is a kind of physical filtration device. Whether an activated carbon treatment device was required or not. A coagulation treatment device was required instead of the pretreatment biological treatment tank. In particular, a large sedimentation tank was required, and the biological treatment tank was also increased in size, so that the installation area had to be widened and the cost was increased. In addition, it takes time, labor, and cost to manage and repair these biological treatment tanks, sedimentation tanks, coagulation treatment devices, etc.
This was adjusted to generate insoluble suspended solids, and the suspended solids were treated by backwashing physical filtration. This PH
It is preferable to use a metal soap such as slaked lime and a rotary backwash type filtration device for adjustment and physical filtration. Further, the wastewater is preliminarily stored in a sedimentation tank, and the pH is adjusted with a metal soap such as slaked lime.
Adjust to generate insoluble suspended solids, treat the suspended solids directly with a rotary backwash filtration means, treat the treated water in a biological treatment tank if necessary, and then sterilize it with water or This is a method for treating sewage used as tap water. Although not shown, the deposits separated by the backflow water of the backwashing filtration means are removed by a screen or the like when discharged to the outside of the tank through the drain pipe, and only the washed wastewater from which the deposits have been removed is removed. May be returned to the preliminary settling tank.

[0008]

[Table 1]

Further, as shown in FIGS. 1 to 3, as a preferred processing apparatus, a horizontal drum 3 in which a filter tank 1 made of a granular filter medium and a space portion 2 are formed in an up-down direction, A first flow pipe 5 for raw water inflow and sewage discharge, in which a first flow section 4 for raw water inflow and sewage discharge is penetrated from the outside of the drum 3 through the axial center thereof and is located in the space 2, and the horizontal drum 3 has a second flowing water pipe 6 for draining inflow and washing water, which is penetrated from the outside through the axial center thereof and is located in the filter tank 1. In the filtration device,
Various plate-like (for example, wire mesh, perforated plate made of metal or synthetic resin, etc.) filter nets 8 are attached directly to the filter tank 1 of the horizontal drum 3 or to a flange or the like by bolts and nuts, welding or bonding. Or, preferably, it is fixed to substantially the entire inner surface of the lid 9 by welding or the like via a bracket-shaped member or a flange 10 provided at the four ends of the lid, or in the filter tank 1 or on the inner surface of the lid 9. It is detachably attached with bolts and nuts 11 and the like. The filter net 8 is provided substantially flush with the inner surface of the horizontal drum 3 by the bracket-shaped member and the flange 10. Also,
The second drainage part for inflow of drainage and outflow of washing water for collecting or filtering the filtered water in the gap 13 between the filtration network 8 and the lid 9 or passing washing water (may be raw water, hereinafter referred to as washing water). It is communicated with 6. The lid 9 is detachably attached to the horizontal drum 3 with bolts and nuts 12 or the like. Further, as shown in FIG. 9 to FIG.
In the flowing water portion 4, various plate-shaped (for example, a wire mesh, a perforated plate made of metal or synthetic resin or the like, preferably a wedge wire), that is, a filtration network 8, that is, the wedge wire 8 is cut into the plate 8a.
.., and the upper, lower, left, and right edges of this plate are exchangeably attached with bolts and nuts via members and flanges 10, and a part of FIG. Is provided with a portion 8d where the slit 8c is not formed, a short pipe 8e is attached to this portion 8d by welding or the like, and the other end of the short pipe 8e is connected to the second flowing water. The lid is detachably attached by fitting to the tube 7. Also wedge wire 8
As shown in FIG. 10, reinforcing bars 8 f are provided at desired intervals in a direction perpendicular to the slit direction on the back surface of
Further, a reinforcing bar 8g may be provided in the slit direction so as to withstand the load of the filter medium and the treated water. Then, it is welded or adhered to the filter tank 1 of the horizontal drum 3 directly or by a flange 10 or the like, or is fixed by a bolt / nut 11 or the like, or preferably, a port provided at the four ends of the lid on substantially the entire inner surface of the lid 9. It is fixed by welding or the like via a U-shaped member or a flange 10, or a bolt and nut 1 is mounted in the filter tank 1 or on the inner surface of the lid 9.
1 and the like, which may be detachably attached, and an auxiliary filtration means may be additionally attached to the raw water inflow / sewage outflow site. The horizontal drum 3 and the first flush pipe 5 for raw water inflow and sewage discharge are fitted by a bearing 16 having a dust seal 14 and a gland packing 15 as shown in FIG. The gear sprocket 17 provided with the bearing 16 and the end wall of the motor 1
By rotating with a driving force of 8 (or a pulley and a belt may be driven), the support frame 20 of the base 19 is
The horizontal drum 3 is rotatably supported by three cam followers (spherical outer ring) 21... Attached at intervals of 20 degrees (or six in the case of a large size). Further, a second flowing water section 6 for draining inflow and washing water, which is in communication with the filtration network 8, is located in the filter tank 1, and a filter for communicating with the second flowing section 6 for draining inflow and washing water outflow. Second flowing water pipe 7 for water inflow and cleaning water outflow
Is fixed to the other end of the horizontal drum 3 integrally with the bearing 22, and the horizontal drum 3 is rotatably supported on the bearing 22 and the support frame 20 of the base 19. In this case, a means for cleaning the back surface of the filtration net and preventing foreign substances such as algae, which will be described later, may be applied.

As shown in FIGS. 1 and 4, at least one and preferably two rails 50 are provided on the outer periphery of the horizontal drum 3 and preferably a pair of guide grooves 51a for guiding the rails 50 are provided. The pair of guide groove rollers 51, 52 supported by rollers 51, 52 provided with a pair of guide grooves 52a, 52a are rotatably mounted on U-shaped frames 53, 54 by shafts 55, 56, and these frames are the rails described above. The base 50 is mounted on the base 19 by welding or the like so as to sandwich the base 50. Also, although not shown, the rails may be concave grooves and the rollers may be convex,
Hereinafter, the rail and the roller provided with the guide include both of the above. By supporting the drum 3 having such a horizontal play, the center of the rotating shaft of the drum can be easily set, and the total weight of the filter tank and the pipes is supported at the lower portion, so that the filter tank can be enlarged. A large-scale sewage treatment can be performed, a load on a cam floor or the like on a driving unit side can be reduced, a mechanism can be simplified, and a processing device with less trouble can be achieved. In addition, since the drum 3 having a play in front, rear, left and right is supported, a desired portion of the pipe between the first flowing water pipe 5 for raw water inflow and sewage outflow and the second flowing water pipe 7 for filtrate inflow and washing water outflow is connected to a flexible joint. 5
7, 58. Reference numeral 59 denotes a hanging bracket.

Further, a first flowing water section 4 for raw water inflow and sewage discharge which penetrates from the outside of the drum 3 and passes through the axial center thereof is located in the space section 2 of the first flowing water pipe 5 for raw water inflow and sewage discharge. The mounting angle was within a range of approximately 90 degrees in the rotation direction of the drum from the stable angle of the filter medium above the granular filter medium. Preferably, the angle is set to 60 degrees (substantially directly above) the stable angle of the filter medium. As a result, the rotation angle of the drum becomes larger than the stable angle at which the granular filter medium starts to collapse (about 30 degrees depending on the diameter, material, rotation speed, etc. of the granular filter medium) at the time of back washing of the filter tank 1 made of the granular filter medium. Even if the filter medium starts to collapse and the filter medium rolls up, since the flowing water pipe 5 is at a distant position, it is possible to prevent the granular filter medium from flowing out of the flowing water pipe 5. Furthermore, the raw water inflow and wastewater outflow first water pipe or the filtered water inflow and washing water outflow second water pipe are fully opened at the time of raw water inflow or treated water outflow at the time of filtration, and washed out at the time of backwashing and washing. Alternatively, as shown in FIG. 5, a valve, which is provided with a throttle opening when the washing water flows in, is preferably provided with a shaft in the valve housing 60 on a side communicating with the second drainage pipe 7 for inflow of filtration water and outflow of washing water. The valve seat 6 by 62
6, a butterfly valve 61 that opens and closes is attached,
A throttle hole 63 is formed in the butterfly valve 61, and a lid 64 is attached to an upper portion of the valve housing 60 by bolts 65 for replacing the valve. With such a valve, a desired flow rate is automatically obtained for the flow of the washing water (in the direction of the dotted line), and the valve is fully opened when the treated water (the flow direction of the filtrate is flowing in the direction of the solid line) flows out. , And no inconvenience occurs because no pressure is applied in the drum.

Next, another embodiment will be described. As shown in FIG. 6, the rail 50, the rollers 51 and the like are omitted from the horizontal drum 3, and the second running water section 6 for inflow of drainage and outflow of washing water is provided. The second drain pipe 7 for inflow of drainage water and outflow of washing water to be communicated is integrally fixed to the other end of the horizontal drum 3 with the bearing 22, and on the support frame 20 of the bearing 22 and the base 19, To 12
Three cam followers (spherical outer ring) mounted at 0 degree intervals 2
3, the horizontal drum 3 is rotatably supported. Further, as another embodiment, as shown in FIG. 7, the inside of the filter tank 1 and the space 2 rotate together with the horizontal drum 3, and the inside of the filter tank 1 and the outflow of the washing water. Wastewater treatment provided with a plate-shaped filtration network 8 communicating with the second flowing water section 6 and a plate-shaped filtration network 8 communicating with the first flowing water pipe 4 for raw water inflow and sewage discharge in the space 2. Device. The same parts as those in FIGS. 1 and 6 are denoted by the same reference numerals, and description thereof will be omitted. Either one or both of the first flowing pipe for raw water inflow and sewage outflow and the second flowing water pipe for infiltration and washing water outflow in each of the above-described embodiments is disposed outside a horizontal drum. This arrangement is a sewage treatment apparatus in which the arrangement is connected to a first flowing section for raw water inflow and sewage outflow or a second flowing section for filtrate inflow and rinsing water outflow located in the filter tank.
That is, as shown in FIG. 8, for example, as shown in FIG. 8, in order to increase the size of the filter tank and to prevent the filter medium from rotating and obstructing the second flowing water pipe 7 for inflow of drainage and outflow of cleaning water, The second outflow water pipe 7 may be provided outside the horizontal drum 3. In addition, since the plate-shaped filtration net 8 can be provided over substantially the entire length of the horizontal drum 3, the filtration efficiency is further improved. Further, the first flush pipe 4 for raw water inflow and sewage outflow may be provided outside the horizontal drum 3. As described above, since the filter tank 1 can be widened to the entire width in the drum 3, the filtration efficiency can be improved. Note that FIG.
As shown in FIG. 9, the lid and the filter net 8 of the wedge wire attached to the inner surface thereof may be made to coincide with the curved surface of the horizontal drum 3, or only the filter net 8 may have a flat or planar shape. Since there is no difference, the curved surface, the flat shape, or the flat shape is hereinafter referred to as a plate shape in the present invention.

Furthermore, a means for cleaning the back surface of the filter net following the rotation of the drum and preventing foreign matter such as algae between the plate-like filter net 8 and the inner wall of the drum 3 is provided. As shown in FIGS. 13 to 17, the kimono means preferably includes a plurality of synthetic resin or metal brushes 32 implanted on a single metal or synthetic resin plate 31 or a connecting rod. A bearing tube 35 is attached to a metal or synthetic resin plate 34 opposed to the bearing 33 by bolts and nuts or welded or adhered, and a rotating brush 36 having a pair of synthetic resin or metal feathers is synthesized. Both ends of the rotating shaft 37 made of resin or metal are inserted, and the shaft of the rotating brush is made flexible so that it is easier to operate by inserting both ends into the inner diameter portion 38 of the bearing tube. In addition, the means for cleaning the back surface of the filtration net and preventing foreign substances such as algae are not shown,
It is preferable to form a large number of lumps obtained by mixing an abrasive into a foam material. The shape of this lump is preferably spherical, but it may be a lump having irregularities in a spherical shape, a cube or a polyhedron, and the material may be metal, ceramics, or a bundle of brushes, and the like. It is called ingot. More preferably, the means for cleaning the back surface of all the above-mentioned filtration nets and preventing deposits such as algae are preferably made of a synthetic resin material, and mixed or covered with a deodorant, so that even when used for a long period of time, Thus, it is possible to prevent the attachment such as algae from being caused by the attachment prevention means, and to maintain the cleanliness easily and prevent a decrease in filtration efficiency. And, as these deterrents, "Trademark siabendazole," which is highly safe without decomposition even at high temperatures,
T, B, Z (manufactured by Merck, USA), chemical name "2 (4-thiazolylbenzmidazole)" or "trademark binazine (manufactured by Bentron, USA), chemical name" 10,10 oxyphenoxyarsine ""," Trademark Nobucoside N-96 "
(Manufactured by Sannobco, Inc., USA). As a coating agent, one or more bactericides consisting of chlorhexidine and a silver salt are coated, or fine metal copper and a rosin-based resin are coated with a cellulose-based polymer. The composition dispersed in the adhesive may be used. In other words, the composition is not limited to the above-described ones as long as it can prevent adhesion of algae or the like to these means by mixing or coating with the adhesion preventing means. In the following, the present invention will be described as mixing or covering a screening agent, etc. A similar screening agent or the like may be mixed or covered in a plate-like filtration net.
The width of each brush may be determined so that two or three brushes are provided, or a guide for each brush may be provided on the back surface of the filter net, or a plate 31 may be provided.
The brushes 32 may be implanted on both sides of the drum 3, and the surface in contact with the drum 3 may be a curved surface matching the shape of the drum. Also, the width of the plate-like brush and the diameter of the rotating brush may be set to a size that can freely move between the filtration net and the inner wall of the drum. further,
When the plate-shaped filter net is made of synthetic resin such as polypropylene and mixed with a protective agent, etc., and when it is attached to the lid, the lid is also made of synthetic resin and mixed with the protective agent, and the lid is made transparent. Then, the inside can be inspected. When these filtration nets and lids are made of metal, they may be covered with a deodorant or the like.

The horizontal drum 3 is provided with a filtration network 8 so that the rotation of the horizontal drum 3 is stopped so that the second drainage section 6 for inflow of drainage and outflow of washing water, which is in communication with the second drainage section 6, is downward.
The rotation of the horizontal drum 3 is stopped by a cam switch (not shown) provided at a desired position and a cam switch which comes into contact with the cam so that the second flushing section 6 for inflow of drainage and outflow of washing water is downward. It has become. This mechanism detects a position where the second flowing water part 6 for inflow of drainage and outflow of washing water is lowered by a sensor (not shown), and detects a rotation angle of a rotating bearing or the like (not shown). ), And the horizontal drum 3 is positioned so that the second flowing water portion 6 for inflow of filtered water and outflow of washing water is downward.
May be stopped. Further, as shown in FIG. 6, in order to prevent the filter medium from entering the bearing portion of the running water pipe supporting the rotation of the drum, the inflow of raw water that functions as an axis supporting the rotation of the horizontal drum 3 is performed. The first for sewage discharge
A sandproof packing 70 is mounted inside the water pipe 5. The fixed pipe 24 which does not rotate with the bearing 22 and communicates with the second flush pipe 7 for inflow of drainage and outflow of washing water is attached via a dust seal, a gland packing 15, a gland presser and the like. , And valve control 2
5 is mounted on the pipe, and supplies raw water and washing water to be described later selectively into the horizontal drum 3. Reference numeral 26 is a raw water inlet,
Reference numeral 27 denotes a treated water outlet, and reference numeral 28 denotes a drain outlet.

In the treatment apparatus, the raw water is supplied as shown in FIG.
As indicated by solid arrows in the drawings, the raw water inlet 26 → pipe 29 → first flowing water pipe 5 → first flowing water part 4 → space part 2 with the filter tank stationary.
→ Filter layer surface → Filter layer 1 → Substantially plate-shaped filtration network 8 → Second flowing water section 6
→ The treated water outlet 28 passes through the second flowing water pipe 7. Next,
The filter medium cleaning action of the processing device will be described. The filter tank is rotated without using the backflow water, and the granular filter media are rubbed against each other, so that the deposits are separated from the filter media and the filter net 8 is rubbed and washed. Next, washing water (which may be treated water) is supplied from the second flowing water pipe 7 to the drum 3 by operating a pump (not shown) or the like.
And the drum 3 is driven by driving means 17 to 19 and the like.
As a result, the drum 3 rotates and the granular filter media rub against each other. When the granular filter media in the filter layer 1 becomes larger than the stable angle, the granular filter media collapses to dissociate the adhered substances of the granular filter media, and the granular filter media enters the drum 3. It is also rubbed with the attached substantially plate-shaped filtration network 8 to dissociate the adhering substances of the substantially plate-shaped filtration net 8, which can be performed without passing water during the dissociation time of the adhering substances. It can be washed with a smaller volume of washing water than the filtration device of the above. These dissociated adhering substances are supplied to the raw water inlet 2 as shown by the dotted arrows indicating the flow of the washing water.
6 → second flowing water pipe 7 → second flowing water part 6 → substantially plate-shaped filtration network 8 of second flowing water part 6 → filter layer 1 → filter layer surface → space part 2 → first flowing water part 4 → first flowing water pipe Through 5, the water is discharged to the outside 27.
Therefore, in the filter medium washing, the granular filter medium is rubbed with the substantially plate-shaped filter net provided in the drum 3 to dissociate the adhering substances of the substantially plate-shaped filter network, and the granular filter medium is rubbed together to form a granular filter medium. The synergistic effect between the dissociation of the adhering substance of the filter medium and the outflow of the washing water from the second flowing water section 6 in the filter layer 1 is performed to a substantially complete wall. In addition, cleaning to discharge the adhering matter wastewater in the pipe and the inside of the particulate filter medium, and to remove the remaining adhering matter to the outside of the tank by the downstream water in the still state of the filter tank after the backflow washing so that the wastewater is not mixed into the initial filtration water. A step may be performed. Next, how to use the sewage treatment apparatus of each of the embodiments will be described. When the filter medium is used for a predetermined period of time as a normal filtration apparatus to backwash and wash the filter medium, it is supported by rails and rollers on the outer periphery of the drum or by a cam follower. Then, the horizontal drum is rotated to collapse the filter medium on the inner peripheral surface of the drum, and the filter medium is forcibly rubbed with the filter medium and the substantially plate-shaped filter net to dissociate the adhering substances. In addition, a cleaning / adhesion prevention means for the filter net following the rotation of the drum between the plate-shaped filter net and the inner wall of the drum is preferably one in which a large number of brushes are planted on one plate, or at least the opposite plate is provided. Simply put a rotating brush attached or a large number of sliding masses between the filter net and the inner wall of the drum. During the filtration, the brush etc. are filtered according to the rotation of the drum during backwashing. Sliding on the back side of the net prevents dirt and algae from adhering, and also removes dirt and the like, so that they can be automatically discharged to the outside together with water. In addition, a valve is provided that opens fully when raw water or treated water flows out during filtration and becomes a throttle opening when washing wastewater flows out or washing water flows in during backwashing. Wastewater treatment equipment. Furthermore, even if the filter medium is wound up due to the collapse of the granular filter medium during backwashing, the opening of the water pipe does not affect the winding up of the filter medium at a position farther than the collapse, and the filter medium in the air reservoir follows the rotation of the drum Therefore, it is possible to almost completely prevent the granular filter medium from flowing out from the opening of the water pipe. Furthermore, outflow of the filter medium from the rotating shaft can be prevented by the sandproof packing.

[0016]

First, the biological treatment is not required because a large-scale sedimentation tank is not required, or a large-scale sedimentation tank can be reduced in size or made preliminary by employing a physical filtration means. The tank is also greatly reduced, and the pH of the sewage, which was considered impossible by physical filtration, is adjusted to generate insoluble suspended solids.
This is a sewage treatment method for simply physically treating the suspended matter. Secondly, the conventional large-scale sedimentation tank is not required, or the large-scale sedimentation tank is reduced in size or made preliminary by employing physical filtration means, and the biological treatment tank is also greatly reduced. The pH of sewage, which had been considered impossible by physical filtration, was adjusted with metal soap such as slaked lime to generate insoluble suspended solids. How to Third, in addition to the first effect or the second effect, there is a method of treating wastewater that can be used as service water or intermediate water in a preliminary sedimentation tank, a biological treatment tank of a required scale, and sterilization. Fourth, in order to filter suspended substances, the area of the filter net is increased to increase the filtration efficiency, and the filter media are rubbed together at the time of backwashing to easily destroy dirt and suspended matter adhering to the filter net. Sewage treatment equipment that can remove and remove suspended solids, and can efficiently and efficiently recover suspended solids, because it is a treatment equipment that can clean filter media with approximately 1/10 the amount of washing water compared to conventional fixed-type backwashing filtration equipment. It is. Fifth, in addition to the fourth effect, a plate-like filtration network is provided in the filter tank and in the space, so that double filtration of rough filtration and filtration in the filter tank can be performed. What adheres to these plate-shaped filtration nets at the time of washing is a sewage treatment apparatus that automatically cleans. Sixth, in addition to the fourth or fifth effect, one or both of a first flowing pipe for inflow of raw water and outflow of sewage and a second flowing pipe for inflow of filtered water and outflow of washing water are used as horizontal drums. The wastewater treatment apparatus has a small or no dead space in the drum because it is disposed outside the wastewater treatment apparatus. Seventh, in addition to the effects of any one of the fourth to sixth aspects, the filter has a self-cleaning function of the back surface of the filtration network and a function of preventing adhesion of algae and the like even when filtering between the inner walls of the drum, so that dirt, algae, etc. This is a processing device that prevents the generation of mold and mold and the like, and automatically cleans by rotating the drum even if dirt or the like adheres. Eighthly, in addition to the seventh effect, a sewage treatment apparatus that can always keep clean by mixing or covering an antifouling agent with an adhesion preventing means is provided. Ninth
Furthermore, in addition to the effects of any of the fourth to eighth aspects, only by mixing or covering the filter net with a deterrent agent, cleaning of the back surface of the filter net is not required for a long time, and the prevention of deposits such as algae is more reliable. It is a sewage treatment device that can be used. Tenth, in addition to the effects of any of the fourth to ninth effects, the first flow pipe for raw water inflow and sewage discharge or the second flow pipe for filtered water inflow and washing water outflow, This is a sewage treatment device that is fully opened and has a valve that becomes a throttle opening when sewage outflow or drainage inflow, so that flow rate adjustment is automated and washing water is saved. First
First, in addition to the tenth effect, the present invention is a sewage treatment apparatus capable of simplifying the structure of a valve and reducing adhesion of suspended substances. Twelfth, in addition to the effects of any one of the fourth to eleventh aspects, the angle of attachment of the first flush pipe for raw water inflow and sewage outflow is set within a range of 90 degrees to a stable angle in the anti-rotation direction with respect to the stationary state of the particulate filter medium. Therefore, the present invention is a sewage treatment apparatus capable of preventing the granular filter medium from flowing out even if the filter medium is wound up due to the collapse of the granular filter medium during backwashing. Thirteenth, in addition to the effects of any of the fourth to twelfth aspects, at least one rail is provided on the outer periphery of the drum, and the drum is supported by a roller provided with a guide for guiding the rail. This is a sewage treatment apparatus that can easily stock the center, support the total weight of the filtration tank and piping, etc. at the lower part, reduce the load on the cam floor and the like on the drive unit side, simplify the mechanism, and cause less trouble. Fourteenth, in addition to the effects of any of the fourth to thirteenth aspects, the filter medium is prevented from entering the bearing portion of the running water pipe that supports the rotation of the drum, has a simple structure, and can withstand long-term use. It is a sewage treatment device that is easy to maintain and has good durability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a wastewater treatment apparatus according to the present invention.

FIG. 2 is a plan view showing a first embodiment of a wastewater treatment apparatus according to the present invention.

FIG. 3 is a side view showing a first embodiment of a wastewater treatment apparatus according to the present invention.

FIG. 4 AA of FIG. 1 of the wastewater treatment apparatus according to the present invention.
It is a line sectional view.

FIG. 5 is an enlarged view of a main part of the wastewater treatment apparatus according to the present invention.

FIG. 6 is a sectional view showing a second embodiment of the wastewater treatment apparatus according to the present invention.

FIG. 7 is a sectional view showing a third embodiment of the wastewater treatment apparatus according to the present invention.

FIG. 8 is a sectional view showing a fourth embodiment of the wastewater treatment apparatus according to the present invention.

FIG. 9 is a partially enlarged plan view of a plate-like filtration net according to the present invention.

FIG. 10 is a partially enlarged plan view of the back surface of FIG. 9 according to the present invention.

FIG. 11 is an enlarged plan view of a main part in which a plate-shaped filtration net according to the present invention is attached to the back surface of a lid.

FIGS. 12 (a) and (b) are enlarged plan views of essential parts of a plate-shaped filtration network according to the present invention.

FIG. 13 is an enlarged plan view of a means for cleaning the back surface of the filter net and preventing adhesion of algae and the like according to the present invention.

FIG. 14 is a side view of FIG. 13 according to the present invention.

FIG. 15 is a plan view of a part of another embodiment of the means for cleaning the back surface of the filter net and preventing adhesion of algae and the like according to the present invention.

FIG. 16 is a side view of FIG. 15 according to the present invention.

FIG. 17 is a side view of the brush used in FIG. 15 according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration tank 2 Space part 3 Horizontal drum 4 First flowing water part for raw water inflow and sewage outflow 5 First flowing water pipe for raw water inflow and sewage outflow 6 Second flowing water part for filtered water inflow and washing water outflow 7 Filtration inflow Second water pipe for washing water outflow 8 Filtration net 9, 64 Lid 10 Flange 11, 65 Bolt / nut 13 Space between drum (lid) and filtration net 14 Dust seal 15 Ground packing 16 Bearing 17 Sprocket 18 Motor 19 Base 20 , 53, 54 Frame 21, 23 Cam floor 22 Bearing 24 Fixed pipe 25 Five-way valve 26 Raw water inlet 27 Treated water outlet 28 Drainage outlet 31, 34 Plate 32 Brush 33 Connecting rod 35 Bearing tube 36 Rotating brush 37 Rotating shaft 38 Inner diameter 50 Rail 51, 52 Roller 55, 56, 62 Shaft 57, 58 Flexible joint 59 Suspension fitting 60 Valve housing 61 Butterfly valve 63 Restriction hole 66 Valve seat 70 Waterproof packing

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 33/58 C02F 1/50 550H C02F 1/50 510 560Z 520 B01D 23/24 C 33/18 A 550 33/36 560

Claims (14)

[Claims] 1. A method for treating sewage, comprising adjusting the pH of sewage to generate insoluble suspended solids, and treating the suspended solids by backwashing physical filtration. 2. The treatment of sewage, wherein the pH of the sewage is adjusted with a metallic soap such as slaked lime to generate insoluble suspended solids, and the suspended solids are treated by a rotary backwashing filtration means. Method. 3. Preliminarily storing sewage in a sedimentation tank, adjusting the pH with a metal soap such as slaked lime to generate insoluble suspended solids, and directly rotating the suspended solids by backwashing filtration means. A method for treating sewage, comprising treating the treated water, treating the treated water in a biological treatment tank as necessary, and then sterilizing the treated water to use as tap water or tap water. 4. A horizontal drum (3) in which a filter tank (1) made of a particulate filter medium and a space (2) are formed in the vertical direction as the backwashing filtration means, and a horizontal drum. From the outside of (3), a first flowing water section (4) for raw water inflow and sewage discharge from its axial center is located in the space (2) and a first flowing water pipe (5) for raw water inflow and sewage discharge. A second flushing section (6) for inflow of drainage and outflow of washing water from outside of the horizontal drum (3) is located in the filtration tank (1). In the filtration device having a second flowing water pipe (7), the filtration tank (1) rotates together with the horizontal drum (3), and the second flowing water section (6) for the inflow of filtered water and the outflow of washing water (6). ), Wherein a plate-like filtration network (8) communicating with the wastewater treatment apparatus is provided. 5. The filter tank (1) and the space (2) rotate together with the horizontal drum (3) in the filter tank (1). 2 A plate-shaped filter net (8) communicating with the flowing water portion (6) is additionally provided, and a plate-shaped filtering net (5) communicating with the first flowing water pipe (5) for raw water inflow and sewage discharge in the space portion (2). The sewage treatment apparatus according to claim 4, further comprising (8). 6. A drum (3) in which one or both of the first flowing pipe (5) for raw water inflow and sewage outflow and the second flowing water pipe (7) for inflow of filtered water and outflow of washing water are provided. And a second flowing section (6) for inflow of raw water and outflow of sewage or a second flowing section (6) for inflow of filtered water and outflow of washing water, which is located in the filter tank (1). The wastewater treatment device according to claim 4 or 5, wherein the wastewater treatment device is communicated with the wastewater treatment device. 7. The filter tank (1) is rotated together with the horizontal drum (3) in the filter tank (1), so that the second filter for inflow of filtrate and outflow of washing water.
A filter net (8), such as a wedge wire, which is in communication with the flowing water section (6) is provided, and the filter net follows the rotation of the drum between the filter net (8) and the inner wall of the drum (3). The sewage treatment apparatus according to any one of claims 4 to 6, further comprising: means for cleaning the back surface of the sewage and preventing deposits such as brushes for algae. 8. The cleaning / adhering substance preventing means such as algae is mixed or covered with a deodorizing agent or the like.
A wastewater treatment apparatus according to claim 1. 9. The sewage treatment apparatus according to claim 4, wherein an anti-blocking agent or the like is mixed in or covered with the plate-shaped filtration network. 10. A first flowing pipe (5) for inflow of raw water and outflow of sewage or a second flowing pipe (7) for inflow of filtered water and outflow of washing water.
10. A valve according to claim 4, further comprising a valve (61) which is fully opened when the raw water and the wash water flows in or the treated water and the wash water flows out, and becomes a throttle opening when the waste water flows out or the wash water flows. The sewage treatment apparatus according to claim 1. 11. The valve has a butterfly valve (61) having a hole (63) of a desired diameter, and functions as a butterfly valve when the raw water and washing water are inflow or the treated water and washing water are fully opened. 11. The sewage treatment apparatus according to claim 10, wherein a small flow rate is provided by a hole (63) having a desired diameter at the time of opening the throttle at the time of sewage outflow or washing water inflow. 12. The installation angle of the first flowing water pipe (5) for inflow of raw water and outflow of sewage is within a range of about 90 degrees in the rotation direction of the drum from the stable angle of the filter medium above the granular filter medium. The sewage treatment apparatus according to any one of claims 4 to 11, wherein: 13. The drum according to claim 4, wherein at least one rail (50) is provided on the outer periphery of said drum, and supported by rollers (52) provided with guides for guiding said rail. The sewage treatment apparatus according to any one of the above. 14. A sandproof packing (70) is mounted inside a first flow pipe (5) for raw water inflow and sewage discharge, which functions as an axis supporting the rotation of the horizontal drum. The sewage treatment apparatus according to any one of claims 4 to 13.