JP2004066217A - Water treatment apparatus and water treatment method - Google Patents

Water treatment apparatus and water treatment method Download PDF

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Publication number
JP2004066217A
JP2004066217A JP2003069855A JP2003069855A JP2004066217A JP 2004066217 A JP2004066217 A JP 2004066217A JP 2003069855 A JP2003069855 A JP 2003069855A JP 2003069855 A JP2003069855 A JP 2003069855A JP 2004066217 A JP2004066217 A JP 2004066217A
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Japan
Prior art keywords
water
sand filtration
filtration layer
raw water
jet
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Granted
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JP2003069855A
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Japanese (ja)
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JP4303012B2 (en
Inventor
Tadayoshi Nagaoka
永岡 忠義
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Tadayoshi Nagaoka
永岡 忠義
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Application filed by Tadayoshi Nagaoka, 永岡 忠義 filed Critical Tadayoshi Nagaoka
Priority to JP2003069855A priority patent/JP4303012B2/en
Publication of JP2004066217A publication Critical patent/JP2004066217A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/004Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D24/00Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/10Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
    • B01D24/14Downward filtration, the container having distribution or collection headers or pervious conduits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D24/00Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46Regenerating the filtering material in the filter
    • B01D24/4605Regenerating the filtering material in the filter by scrapers, brushes, nozzles or the like placed on the cake-side of the stationary filtering material and only contacting the external layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D24/00Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46Regenerating the filtering material in the filter
    • B01D24/4605Regenerating the filtering material in the filter by scrapers, brushes, nozzles or the like placed on the cake-side of the stationary filtering material and only contacting the external layer
    • B01D24/4621Regenerating the filtering material in the filter by scrapers, brushes, nozzles or the like placed on the cake-side of the stationary filtering material and only contacting the external layer by nozzles acting on the cake side of the filter material, or by fluids acting in co-current direction with the feed stream
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D24/00Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46Regenerating the filtering material in the filter
    • B01D24/4631Counter-current flushing, e.g. by air
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/006Water distributors either inside a treatment tank or directing the water to several treatment tanks; Water treatment plants incorporating these distributors, with or without chemical or biological tanks
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/74Treatment of water, waste water, or sewage by oxidation with air
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • C02F2101/203Iron or iron compound
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • C02F2101/206Manganese or manganese compounds

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and compact apparatus for oxidizing, flocculating and filtering the suspended matter contained in raw water without using a flocculant. <P>SOLUTION: This water treatment apparatus (1) is provided with a raw water sending pipe (4), a plurality of jet nozzles (5) one end of each of which is communicated with the pipe (4) and each of which has a raw water jetting spout (5a) at the other end for jetting the raw water as a jetted water current, a sand filtration layer (2) arranged below the nozzles (5) while leaving a prescribed space between the surface of the layer (2) and each of the spouts (5a) of the nozzles (5), a filtrate withdrawing port (9) for withdrawing the water filtered by the layer (2) and a mechanism (20) for reciprocating the pipe (4) on the plane parallel to the surface of the layer (2). <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water treatment apparatus and a water treatment method, and in particular, clays, bacteria, algae and other suspended substances in tap water raw water or the like can be aerated by a simple and small apparatus without using a flocculant. The present invention relates to a water treatment apparatus that can be treated by oxidizing and flocking.
[0002]
[Prior art]
There are two types of tap water filtration methods specified in the Japan Water Works Association water supply facility design guidelines: slow filtration and rapid filtration.
[0003]
In slow filtration, when the quality of tap water raw water is extremely good and stable, raw water is directly put into the sand filtration layer and slowly passed through the sand filtration layer, and the surface water of the sand layer and the microorganisms that have multiplied in the sand layer are used in the water. To trap and oxidatively decompose insoluble and soluble substances. In this method, the sand filtration layer requires a large area because the filtration speed is slow at a low speed (4 to 5 m / d), and an enormous amount of work is required to remove the clogged sand on the surface layer. Further, when the quality of raw water deteriorates, floc is generated by performing a chemical treatment as a pretreatment, and it is required to send the treated water to a sand filtration layer after sending the treated water to a sedimentation basin.
[0004]
On the other hand, rapid filtration has the advantages of a high filtration speed of 120 m to 150 m / d and a small filtration area, and can cope even when the quality of raw water is poor. It is required that suspended substances such as clayey substances, bacteria, and algae in water are flocculated in advance to form flocs, settled and separated in a sedimentation basin, and then sent to a sand filtration layer.
[0005]
[Problems to be solved by the invention]
In a rapid filtration type water treatment apparatus in which the flocculant is injected, a relatively large amount of the flocculant is consumed, so that the purchase cost is large. Further, the water treatment apparatus by this chemical injection system is composed of an aeration tank, a coagulation tank, a sedimentation tank, a sand filtration tower, and a chemical tank, and the system is complicated, and the entire apparatus is large-scale and requires a large installation space. . The filtered sand used in this chemical injection type water treatment equipment must be replaced from time to time due to clogging due to the accumulation of impurities.In this case, the sand contains chemicals and must be treated as industrial waste. In addition, there are inconveniences such as the abandoned places being restricted.
[0006]
On the other hand, the washing (backwashing) of the sand filtration layer with backflow water requires that the filter medium of the entire filtration layer be sufficiently washed evenly, and the quality of the backwashing greatly affects the filtration efficiency. In the conventional rapid filtration device, a complicated and large-scale structure is necessary for the lower water collecting device in order to enhance the backwashing effect, and a large amount of backwashing wastewater is required because a large amount of time is required for the backwashing operation. As a result, the backwash sewage treatment apparatus becomes large.
[0007]
The present invention has been made in view of the drawbacks of the above-mentioned conventional rapid filtration water treatment apparatus using a chemical injection method, and uses a simple and small-sized apparatus for suspending substances in raw water without using a chemical such as a flocculant. It is an object of the present invention to provide a water treatment apparatus that can be treated by oxidizing and flocculating with water.
[0008]
The applicant has filed an application according to Patent Document 1 as a prior application relating to the present invention.
[0009]
[Patent Document 1]
JP-A-2002-125768
[0010]
[Means for Solving the Problems]
A water treatment apparatus of the present invention that achieves the above object has a plurality of jets each having a raw water supply pipe, one end of which communicates with the raw water supply pipe, and a raw water jet that jets raw water as a jet stream at the other end. A nozzle, a sand filtration layer whose surface is located below the jet nozzle at a predetermined distance from the raw water jet of the jet nozzle, and the sand filtration layer for removing water filtered by the sand filtration layer. And a mechanism for reciprocating the raw water supply pipe on a plane parallel to the surface of the sand filtration layer.
[0011]
According to the present invention, the jet water stream is slammed from the raw water jet port of the jet nozzle onto the water surface on the sand filtration layer disposed therebelow, and the air is entrained in the water, whereby a number of bubbles are generated, and the water and the water are filtered. Intense aeration occurs on the sand surface. Due to this aeration, clay, bacteria, algae and other suspended substances in the water are oxidized to form flocs or to be trapped on the surface of the filter sand which precipitates to form a sand filter layer. The flocs thus formed are more likely to be trapped on the surface of the filter sand. The filtered water from which these flocs and other foreign substances have been filtered by the sand filtration layer is taken out from the filtered water outlet.
[0012]
Therefore, according to the present invention, as a pretreatment for sand filtration, steps such as flocking and coagulation and sedimentation by chemical treatment are not required.
[0013]
Since the flocs of the oxide particles are captured on the surface of the filter sand, the filtration speed is as high as 120 m to 150 m / d, which is almost the same as that of rapid filtration, and a relatively narrow filtration area is sufficient.
[0014]
If the above-mentioned filtering action is continued, oxide flocs and other foreign substances accumulate on the surface of the sand filtration layer over time, and the sand filtration layer is covered with the flocs and other foreign substances, so that the sand filtration layer is closed. Although the filtration function is reduced, according to the present invention, since a mechanism for reciprocating the raw water supply pipe on a plane parallel to the surface of the sand filtration layer is provided, the water surface is slightly above the surface of the sand filtration layer. By operating this mechanism in the condition adjusted to the above, the raw water feed pipe is reciprocated on a plane parallel to the surface of the sand filtration layer, so that the jet water flow jetting from the raw water jet of the jet nozzle closes the sand filtration layer surface Violently smashing, thereby loosening the clogging of the entire surface of the sand filtration layer with foreign matter, and removing the clogged state of the surface of the sand filtration layer with foreign matter. After removing the clogging of the surface of the sand filtration layer in this way, the filtered water flows back downward from above the sand filtration layer and discharges the backwashed sewage to the outside of the sand filtration layer. To completely recover.
[0015]
In one aspect of the present invention, in the water treatment apparatus, a clogging loosening bar is provided between each adjacent one of the plurality of jet nozzles such that a tip is inserted into a surface layer of the sand filtration layer. It is characterized by having been done.
[0016]
With this configuration, at the time of backwashing, the raw water feed pipe is reciprocated on a plane parallel to the surface of the sand filtration layer, so that the clogging loosening rod reciprocates in a state of being inserted into the surface layer of the sand filtration layer. In addition, the surface layer of the sand filtration layer is plowed by a clogging loosening rod, so that clogging on the surface of the sand filtration layer can be more effectively loosened.
[0017]
In one aspect of the present invention, a water treatment device includes an air supply pipe, and a plurality of jet nozzles each having an air ejection port having one end communicating with the air supply pipe and the other end ejecting air as a jet stream. A sand filtration layer having a surface disposed below the jet nozzle at a predetermined interval from the air nozzle of the jet nozzle, a water pipe for feeding raw water to the sand filtration layer, and a sand filtration layer. A filter water outlet provided in the sand filter layer for removing filtered water, and a mechanism for reciprocating the air supply pipe on a plane parallel to the surface of the sand filter layer, I do.
[0018]
According to this configuration, the suspended matter in the raw water sent to the sand filtration layer is oxidized by the aeration generated by the jet air flow jetted from the jet nozzle, is flocculated, and is similar to the device that jets the jet water flow. Is trapped on the sand filtration layer and filtration is performed. The action of the jet air flow during backwashing is the same as the action of the jet water flow.
[0019]
Also in this apparatus, a clogging loosening rod can be disposed such that the tip is inserted into the surface layer of the sand filtration layer between the adjacent jet nozzles of the plurality of jet nozzles. Surface clogging can be more effectively released.
[0020]
In one aspect of the present invention, when filtering raw water, jet water is jetted from a jet nozzle to perform aeration on water on the sand filtration layer and on the surface of the sand filtration layer. A water treatment method is provided in which a mechanism for reciprocating the raw water water supply pipe while jetting a jet water stream from a nozzle is operated to loosen clogging in a surface layer of the sand filtration layer by the jet water stream.
[0021]
In another aspect of the present invention, a filtered water circulating means for stopping supply of raw water from the raw water pipe when the supply of filtered water is stopped and returning filtered water to the raw water pipe to circulate through the sand filtration layer. The water treatment apparatus is further provided with:
[0022]
Iron filtration bacteria and other microorganisms inhabit spontaneously in the sand filtration layer, and colonies of these microorganisms are formed. These microorganisms have the effect of removing impurities such as iron and manganese in raw water by oxidizing and adsorbing them. According to the present invention, it is presumed that the dissolved oxygen in the raw water increases in a large amount by aeration, so that the activity of these microorganisms also increases, and the iron-removing and manganese-removing effects are promoted. According to the above configuration of the present invention, even during a period in which filtration water is unnecessary and supply of the filtration water is stopped, the filtration water is returned to the raw water supply pipe and circulated through the sand filtration layer and aeration is continuously performed, Dissolved oxygen is sufficiently supplied to the iron bacteria and other microorganisms in the sand filtration layer even during the period when the supply of filtered water is stopped, so that the microorganisms are prevented from being killed or reduced due to lack of oxygen, and the sand filtration layer is restarted when the supply of filtered water is resumed. , The reduction of the iron removal and manganese removal effects can be prevented.
[0023]
The filtered water circulation means includes a filtered water circulation pipe connecting the filtered water outlet and the raw water water supply pipe, a feedwater pump connected to the filtered water circulation pipe, and a filtration water circulation pipe provided in the filtered water circulation pipe. At the time of water supply, supply the filtered water and stop the water supply to the filtered water circulation pipe.When the supply of the filtered water is stopped, the supply of the filtered water is stopped and the filtered water is supplied to the raw water supply pipe via the filtered water circulation pipe. A switching valve for returning, and provided in the raw water supply path, passes the raw water when supplying the filtered water and stops the passage of the filtered water from the filtered water circulation pipe, and stops the passage of the raw water when the supply of the filtered water is stopped. Valve means for passing the filtered water from the filtered water circulation pipe.
[0024]
The filtered water circulating means includes a filtered water circulating outlet separate from the filtered water outlet, a filtered water circulating pipe connecting the filtered water circulating outlet with the raw water feed pipe, and a filtered water circulating pipe. A water supply pump connected thereto, a valve provided in the pipeline on the filtered water outlet side, and a valve which opens when supplying the filtered water and closes when the supply of the filtered water is stopped, and which is provided in the raw water supply passage, A valve means is provided for passing raw water during supply and stopping the passage of filtered water from the filtered water circulation pipe, and for stopping supply of filtered water, stopping the passage of raw water and passing filtered water from the filtered water circulation pipe. It can also be configured as follows.
[0025]
In another aspect of the present invention, the water treatment apparatus further includes a backwash tube embedded in the sand filtration layer, the backwash tube reverses the sand filtration layer blockage accumulated on the sand filtration layer. It is characterized by being buried at a depth sufficient to remove by washing and at such a depth that there is a portion of the sand filter layer as thick as possible below the backwash tube.
[0026]
With this configuration, the sand filter layer blockage accumulated on the upper part of the sand filter layer is washed away and removed by backwashing, while the sand filter layer below the backwash tube is not affected by the backwash. The colonies of iron bacteria and other microorganisms present in the sand filter layer below the sand filter layer are not destroyed, and when the equipment is restarted after backwashing, iron removal and removal by the microorganisms present in this part of the sand filter layer are performed. The manganese effect is maintained and the iron removal and manganese removal effects of the entire water treatment apparatus can be improved.
[0027]
In another aspect of the present invention, when filtering raw water, jet water is jetted from a jet nozzle to perform aeration on water on the sand filtration layer and on the surface of the sand filtration layer. Water treatment characterized by operating a mechanism for reciprocating the raw water pipe while jetting a jet water stream from a jet nozzle to loosen clogging on the surface layer of the sand filtration layer with the jet water stream and the clogging loosening rod. A method is provided.
[0028]
In another aspect of the present invention, during filtration of raw water, the raw water is supplied from the water pipe to the sand filtration layer, and a jet air stream is jetted from a jet nozzle, whereby the water on the sand filtration layer and the surface of the sand filtration layer are separated. When the sand filtration layer is back-washed, a mechanism for reciprocating the air supply pipe while jetting a jet air flow from the jet nozzle is operated to perform the surface layer of the sand filtration layer by the jet air flow. The present invention provides a water treatment method characterized by relieving clogging in the above.
[0029]
In another aspect of the present invention, at the time of raw water filtration, raw water is supplied from the water supply pipe to the sand filtration layer, and a jet air flow is jetted from a jet nozzle connected to an air supply pipe, whereby the sand filtration layer is provided. Aeration is performed on the water and the surface of the sand filtration layer, and when the sand filtration layer is back-washed, a mechanism for reciprocating the air supply pipe while ejecting the jet air flow from the jet nozzle is operated to operate the jet air flow. And a water treatment method characterized in that clogging in the surface layer of the sand filtration layer is loosened by the clogging loosening rod.
[0030]
In another aspect of the present invention, when filtering raw water, jet water is jetted from a jet nozzle to perform aeration on water on the sand filtration layer and on the surface of the sand filtration layer. A water characterized in that the mechanism for reciprocating the raw water pipe is operated in a state in which jet water jetting from the jet nozzle is stopped, and clogging in the surface layer of the sand filtration layer is loosened only by the clogging loosening rod. A processing method is provided.
[0031]
According to another aspect of the present invention, during raw water filtration, raw water is supplied from the water supply pipe to the sand filtration layer, and a jet air stream is jetted from an air supply pipe, whereby the water and the sand filtration layer on the sand filtration layer are discharged. When aeration is performed on the surface and the sand filtration layer is backwashed, a mechanism for reciprocating the air supply pipe with the jet air flow from the air supply pipe stopped being stopped is operated to release the clogging rod. A water treatment method characterized by loosening clogging in the surface layer of the sand filtration layer by only the method.
[0032]
In still another aspect of the present invention, when supply of filtered water is stopped, supply of raw water from the raw water pipe is stopped, and filtered water is returned to the raw water pipe to circulate through the sand filtration layer and aeration is performed. There is provided a water treatment method further comprising a step of maintaining the concentration of dissolved oxygen in filtered water at a predetermined level by performing the treatment continuously.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view schematically showing one embodiment of a water treatment apparatus according to the present invention, in which a part of a side wall of a filtration tank is removed and shown. FIG. FIG. 4 is a cross-sectional view showing the position of the jet nozzle at the time.
[0034]
The water treatment apparatus 1 includes, as main components, a filtration tank 3 containing a sand filtration layer 2, a raw water water supply pipe 4, a jet nozzle 5, and a raw water water supply pipe reciprocating mechanism 20.
[0035]
A raw water supply pipe 4 composed of a steel pipe or the like for supplying raw water such as river water to be filtered to the filtration tank 3 is connected to a raw water supply source (not shown) via a hose 27, and is supplied at a predetermined flow rate. 4 is supplied with raw water.
[0036]
The raw water supply pipe 4 is disposed above the filtration tank 3 so as to be able to reciprocate on the plane parallel to the surface of the sand filtration layer 2 so as to extend on the plane. FIG. 1 is a diagram showing a state in which the raw water supply pipe 4 is reciprocating in the center of the filtration tank 3 during backwashing.
[0037]
A plurality of jet nozzles 5 are provided to branch off from the raw water supply pipe 4 vertically. An upstream end 5a of each jet nozzle 5 is fitted into the raw water transmission pipe 4 such that the inside communicates with the raw water transmission pipe 4, and a raw water jet that jets the raw water as a jet water stream is provided at the downstream end. An outlet 5b is formed. The inner diameter of the jet nozzle 5 is preferably, for example, about 3 to 6 mm.
[0038]
In the filtration tank 3, the surface of the sand filtration layer 2 is disposed below the jet nozzle 5 with a predetermined distance (for example, about 35 cm) from the raw water jet port 5 b of the jet nozzle 5. The sand filtration layer 2 is made of filtered sand, and has a function of filtering raw water by capturing oxide flocs and other foreign substances in raw water supplied as a jet stream from the jet nozzle 5. The flow rate of water in the filtration tank 3, that is, the filtration speed, varies depending on the degree of filtration of the target foreign matter (the allowable concentration of the foreign matter in the filtered water) and the like, but the same filtration rate as rapid filtration, that is, 120 to 150 m / d is desirable. .
[0039]
In the filter tank 3, the sand filtration layer 2 is supported by a small-sized support gravel layer 6 and a large-size support gravel layer 7 provided thereunder. The large-size support gravel layer 7 includes a plurality of parallelly arranged gravel layers 7. Is supported by a support gravel receiving plate 8 made of wedge wire. Below the supporting gravel receiving plate 8 is a lower space 16 from which filtered water is discharged, and a filtered water take-out pipe 9 for taking out filtered water is attached to the side wall of the filtration tank 3 facing this space 16. ing.
[0040]
A backwash pipe 15 for backwashing the sand filtration layer 2 is disposed in a lower space 16 in the filtration tank 3. The backwash pipe 15 has a large number of backwash water jets 15a opening upward. The backwash pipe 15 is connected to a backwash water supply source (not shown).
[0041]
As shown in FIG. 2, at the end 3 d of the filtration tank 3 where the raw water supply pipe 4 is located at the time of filtration, the raw water is supplied between the raw water jet port 5 b of the jet nozzle 5 and the surface of the sand filtration layer 2. A baffle plate 13 made of a steel plate or the like is provided in parallel with the water pipe 4 and directly below the raw water jet port 5b of each jet nozzle 5. Both ends in the longitudinal direction of the baffle plate 13 are fixed to the inside of the opposed side walls 3a, 3b of the filtration tank 3 by means such as welding. As an example, assuming that the water depth from the water surface in the filtration tank 3 to the surface of the sand filtration layer 2 is 30 cm and the distance from the raw water jet 5b of the jet nozzle 5 to the water surface is 5 cm, the depth of the baffle plate 13 from the water surface is About 5 cm (the distance from the raw water jet 5b is about 10 cm) is preferable.
[0042]
On both sides 3a and 3b of the filtration tank 3, a backwash water drain gutter 18 is provided such that the upper end edge is located above the surface of the raw water on the sand filtration layer. One end 18a of the gutter 18 is closed, and the other end 18b is opened to discharge backwash wastewater to the outside.
[0043]
In this embodiment, a raw water transmission pipe reciprocating mechanism 20 for reciprocating the raw water transmission pipe 4 on a plane parallel to the surface of the sand filtration layer 2 is fixed to one end of the raw water transmission pipe 4 and running wheels 21 are provided at the bottom. A driving device 23 having an electric motor and a reduction gear therein for driving the traveling wheels 21 of the traveling box 22 provided with the traveling plate 22; a traveling plate 25 fixed to the other end of the raw water pipe 4 and having traveling wheels 24 at the bottom; A mechanism including a pair of rails 26 fixed to the frame 3e of the filtration tank 3 so that the traveling wheels 21 and 24 are engaged with each other is used. By rotating the electric motor of the driving device 23 in one direction, the raw water transmission pipe 4 travels in one direction, and by rotating the electric motor in the opposite direction, the raw water transmission pipe 4 travels in the opposite direction.
[0044]
The reciprocating motion of the raw water supply pipe 4 is not limited to the illustrated mechanism, and other mechanisms such as a mechanism using a feed screw and a chain drive mechanism may be used.
[0045]
Next, the operation of the water treatment apparatus according to this embodiment will be described.
During raw water filtration, the raw water is supplied to the jet nozzle 5 through the raw water feed pipe 4 while maintaining the water depth on the surface of the sand filtration layer 2 at a predetermined depth (for example, about 30 cm), and the water in the jet nozzle 5 is supplied. Is set to, for example, 1.5 to 3 liters / minute, the raw water is jetted from the raw water jet port 5b as a jet water stream. The jet stream of raw water is struck against the water surface on the sand filtration layer 2, and a number of bubbles are generated, causing intense aeration on the water surface and the surface of the filtered sand. The baffle 13 promotes this aeration. Due to this aeration, components such as clay, bacteria, algae and the like are oxidized to form flocs, or are trapped on the surface of the filtered sand forming the sand filtration layer 2. The filtered water from which these flocs and other foreign matter have been filtered by the sand filter layer 2 is taken out through a filtered water take-out pipe 9.
[0046]
If the above filtering action is continued, oxide flocs and other foreign substances accumulate on the surface of the sand filtration layer 2 over time, and the surface of the sand filtration layer 2 is covered and blocked by the floc and other foreign substances, and the sand filtration layer is blocked. The surface filtration layer 2 is clogged, and the filtration function of the sand filtration layer 2 is reduced.
[0047]
In this case, the raw water feed pipe reciprocating mechanism 20 is operated while supplying the raw water with the water surface adjusted to a predetermined level above the surface of the sand filtration layer (for example, a level approximately 10 cm above the surface of the sand filtration layer), and Starting from the position at the right end of filtration 2 at the time of filtration, the raw water supply pipe 4 is reciprocated in a direction indicated by an arrow on a plane parallel to the surface of the sand filtration layer 2, so that the raw water is discharged from the raw water discharge port 5 b of the jet nozzle 5. The jet water stream is violently beaten against the surface of the clogged sand filtration layer 2, thereby cultivating the entire surface of the sand filtration layer 2, removing clogging due to foreign matter on the surface of the sand filtration layer, and removing the sand filtration layer 2 from its original state. Restore filtration function. After the clogging of the surface of the sand filtration layer 2 is removed in this way, the backwash water is passed from the backwash pipe 15 through the support gravel receiving plate 8 formed of a plate-like screen from below to above the sand filtration layer 2 so that the backwash water is reversed. Wash water is discharged to the outside from the backwash water drainage gutter 18.
[0048]
FIG. 3 is a perspective view similar to FIG. 1 schematically showing one embodiment of the invention in which aeration is performed by a jet air flow, which is another aspect of the present invention. In the embodiment of FIG. 3, the same components as those of the embodiment of FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.
[0049]
The water treatment device 30 includes, as main components, a filtration tank 3 containing the sand filtration layer 2, a raw water water supply pipe 38, an air supply pipe 34, a jet nozzle 35, and an air supply pipe reciprocating mechanism 20.
[0050]
A raw water supply pipe 38 composed of a steel pipe or the like that supplies raw water such as river water to be filtered to the filtration tank 3 is connected to a raw water supply source (not shown), and the raw water is supplied through the raw water supply pipe 38 at a predetermined flow rate. It is supplied into the filtration tank 3.
[0051]
The air supply pipe 34 is disposed above the filtration tank 3 so as to be reciprocable on the plane parallel to the surface of the sand filtration layer 2 so as to extend on the plane. FIG. 3 is a view showing a state in which the air supply pipe 34 is reciprocating in the center of the filtration tank 3 during backwashing. The air supply pipe 34 is connected via a hose 39 to a compressed air source (not shown) such as an air compressor.
[0052]
A plurality of jet nozzles 35 are provided so as to branch vertically from the air supply pipe 34. The upstream end 35a of each jet nozzle 35 is fitted into the air supply pipe 34 such that the inside thereof communicates with the air supply pipe 34, and the air that jets air as a jet air flow is provided at the downstream end. An ejection port 35b is formed. The inner diameter of the jet nozzle 5 is preferably, for example, about 3 to 6 mm.
[0053]
In this embodiment, at the time of filtering the raw water, the raw water is supplied from the raw water supply pipe 38 to the sand filtration layer 2, and the jet airflow is jetted from the jet nozzle 35 connected to the air supply pipe 34, so that the raw water is supplied onto the sand filtration layer 2. When the sand filtration layer 2 is back-washed by performing aeration on the water and the surface of the sand filtration layer, the air filtration pipe reciprocating mechanism 20 is operated while the jet air flow is jetted from the jet nozzle 35 to perform sand filtration by the jet air flow. The clogging in the surface layer of the layer 2 can be released.
[0054]
FIG. 4 is a view schematically showing an embodiment of the invention in which a clogging loosening bar is provided between adjacent jet nozzles according to another aspect of the present invention, as viewed from the direction in which the raw water water pipe reciprocates. It is a figure which removes and shows one side wall of a filtration tank. 4, the same components as those of the embodiment of FIG. 1 are denoted by the same reference numerals, and the description will be omitted.
[0055]
This embodiment is a modified embodiment common to both the embodiment in which aeration is performed by ejecting raw water as a jet stream shown in FIG. 1 and the embodiment in which aeration is performed by ejecting air as a jet stream shown in FIG. In FIG. 4, the reference numerals of the components shown in FIGS. 1 and 2 are shown together.
[0056]
In this embodiment, the water treatment apparatus 40 includes a rod 42 for clogging and loosening disposed between each adjacent one of the plurality of jet nozzles 5 or 35 of the raw water water supply pipe 4 or the air supply pipe 34. ing. The clog loosening rod 42 is made of a rigid material such as steel, and its base 42a is fixed to the bottom wall of the raw water water pipe storage tube 28 or the air supply pipe storage tube 37 by welding or the like, and its tip 42b is a sand filtration layer. 2 is inserted in the surface layer.
[0057]
With this configuration, during backwashing, the raw water supply pipe 4 or the air supply pipe 34 is reciprocated on a plane parallel to the surface of the sand filtration layer 2, so that the clogging loosening rod 42 is placed in the surface of the sand filtration layer 2. Since it reciprocates in the inserted state, the surface layer of the sand filtration layer 2 is plowed by the clogging loosening rod 42, so that clogging of the surface of the sand filtration layer 2 can be more effectively loosened.
[0058]
In this embodiment, at the time of raw water filtration, a jet water flow or a jet air flow is jetted from the jet nozzle 5 or 35 connected to the raw water supply pipe 4 or the air supply pipe 34, so that the underwater and sand filtration layers on the sand filtration layer 2 are formed. When the aeration is performed on the surface of the substrate 2 and the sand filtration layer 2 is backwashed, a mechanism 20 for reciprocating the raw water supply pipe 4 or the air supply pipe 34 while jetting a jet water stream or a jet air stream from the jet nozzle 5 or 35 is provided. In operation, the clogging in the surface layer of the sand filtration layer 2 is released by the jet water stream or jet air flow and the clogging release rod 42.
[0059]
In another embodiment, during raw water filtration, jet water or jet air flow is jetted from the jet nozzle 5 or 35 to aerate the water on the sand filtration layer 2 and the surface of the sand filtration layer 2 to perform sand filtration. When the layer 2 is backwashed, the mechanism 20 for reciprocating the raw water supply pipe 4 or the air supply pipe 34 while the jet water flow or jet air flow from the raw water supply pipe 4 or the air supply pipe 34 is stopped is activated. The clogging on the surface layer of the sand filtration layer 2 is loosened only by the clogging loosening rod 42.
[0060]
FIG. 5 is a perspective view similar to FIG. 1 showing another embodiment of the present invention, and FIG. 6 is a sectional view similar to FIG. 2 of the same embodiment. In this embodiment, the same components as those in the embodiment of FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.
[0061]
In the embodiment of FIG. 5, one or a plurality of backwash tubes 48 are embedded at a predetermined depth in the filter medium layer 2. The burial depth of the backwash pipe 48 is sufficient to remove the sand filter layer blockage accumulated on the upper part of the sand filter layer 2 by backwashing, and is as thick as possible below the backwash pipe 72 for sand filtration. The depth is set so that the portion of the layer 2 exists. This depth is determined in consideration of various factors such as the type and amount of the sand filter layer blockage, the particle size of the sand forming the sand filter layer, the flow rate of the backwash water, and the number of backwashes during a certain period. .
[0062]
As the sand filter layer 2 is used for a longer period of time, colonies of iron bacteria and other microorganisms are naturally formed on the sand filter layer 2, and the colonies of these microorganisms are formed not only on the surface layer of the sand filter layer 2 but also on the sand filter layer. As a result of an experiment, it was found that the steel was formed even from the center to the lower part of No. 2 and that the iron removal and the manganese removal were performed considerably, if not as much as the surface layer. In other words, it has been found that iron removal and manganese removal by microorganisms are performed at the entire depth of the sand filtration layer. Therefore, by burying the backwash pipe 48 at such a depth position in the sand filtration layer 2, the sand filtration layer blockage accumulated on the upper part of the sand filtration layer 2 is washed away and removed by the backwash. Since the backwashing does not affect the sand filter layer 2 below the backwash tube, the colonies of iron bacteria and other microorganisms existing in the sand filter layer below the sand filter layer 2 are not destroyed, When the operation of the apparatus is resumed after the backwash, the iron removal and manganese removal effects of the microorganisms present in this part of the sand filtration layer 2 are maintained and the iron removal and manganese removal effects of the entire water treatment apparatus can be improved. it can.
[0063]
The water treatment apparatus according to this embodiment stops supply of raw water from the raw water feed pipe 4 during a period when filtered water is unnecessary, that is, when the supply of filtered water is stopped, and returns the filtered water to the raw water feed pipe 4 so that the sand filtration layer The apparatus further includes a filtered water circulating means 50 for circulating the inside of the filter 2.
[0064]
The filtered water circulation means 50 is connected to a filtered water circulation pipe 52 composed of a flexible pipe such as a hose connecting the filtered water discharge pipe 9 and the hose 27 connected to the raw water supply pipe 4, and to the filtered water circulation pipe 52. Provided at the connection between the supplied water supply pump 58, the filtered water circulation pipe 52 and the filtered water discharge pipe 9, and supplies the filtered water and stops the supply of the filtered water to the filtered water circulation pipe 52 when supplying the filtered water. At the time of the stop, the switching valve 54 for stopping the supply of the filtered water and returning the filtered water to the raw water supply pipe 4 side through the filtered water circulation pipe 52, and a connecting portion between the hose 27 and the filtered water circulation pipe 52 are provided. A valve that allows the passage of raw water and stops the passage of filtered water from the filtered water circulation pipe 52 during water supply, and stops the passage of raw water and stops the passage of filtered water from the filtered water circulation pipe 52 when the supply of filtered water is stopped. And a switching valve 56 is stepped.
[0065]
When the supply of the filtered water is stopped, the switching valve 56 is switched to stop the passage of the raw water to the raw water supply pipe 4 and to allow the passage of the filtered water from the filtered water circulation pipe 52, while the switching valve 54 switches the supply of the filtered water. The filtered water is switched to stop to allow the filtered water to pass through the filtered water circulation pipe 52, and by operating the water supply pump 58, the filtered water is supplied from the filtered water discharge pipe 9 via the filtered water circulation pipe 52 to the raw water supply pipe 4. , And after being aerated through the jet nozzle 5, falls into the filter medium layer 2. Therefore, even during a period in which filtered water is unnecessary and the supply of filtered water is stopped, the filtered water is returned to the raw water supply pipe 4, circulated in the sand filtration layer 2, and aeration is continuously performed, so that the filtered water supply is stopped. Dissolved oxygen is sufficiently supplied to the iron bacteria and other microorganisms in the sand filtration layer 2 during the operation, and as a result, the microorganisms are prevented from being killed or reduced due to the lack of oxygen due to the shutdown of the device, and the sand is re-supplied when the supply of filtered water is resumed. It is possible to prevent a reduction in iron removal and manganese removal effects in the filtration layer 2.
[0066]
FIG. 7 is a perspective view similar to FIG. 5 showing a modified example of the filtered water circulation means. In this modification, the filtered water circulating means 60 is provided with a filtered water circulating outlet 61 separate from the filtered water outlet pipe 9, and a filter made of a flexible material such as a hose connecting the filtered water circulating outlet 61 and the hose 27. A water circulation pipe 62, a water supply pump 68 connected to the filtered water circulation pipe 62, and a filtered water take-out pipe 9; a valve 64 that opens when filtered water is supplied and closes when filtered water supply is stopped; 27 is provided at a connection portion between the filtered water circulation pipe 62 and the filtered water circulation pipe 62. When the filtered water is supplied, the raw water is allowed to pass, and the filtration water from the filtered water circulation pipe 62 is stopped. In addition, a switching valve 66 as valve means for passing filtered water from the filtered water circulation pipe 62 is provided.
[0067]
In addition, various modifications can be considered as the filtered water circulation means.
[0068]
In each of the above embodiments, the water treatment apparatus provided with the filtration tank 3 containing the sand filtration layer is provided, but the present invention is not limited to this, and the water treatment plant in which the sand filtration layer is contained in the filtration pond is provided. And so on.
[0069]
【The invention's effect】
As described above, according to the present invention, a jet water stream or a jet air stream is slammed from a jet nozzle onto a surface of a sand filter layer disposed below the jet nozzle, and a large number of bubbles are generated by entraining air into the water. The surface of the filter sand where the clay, bacteria, algae and other suspended substances in the water are oxidized to form flocs or settle to form a sand filter layer due to the aeration of the water and the filter sand surface. Is captured by Therefore, according to the present invention, as a pretreatment for sand filtration, steps such as flocking and coagulation and sedimentation by chemical treatment are not required.
[0070]
Since the flocs of the oxide particles are captured on the surface of the filter sand, the filtration speed is as high as 120 m to 150 m / d, which is almost the same as that of rapid filtration, and a relatively narrow filtration area is sufficient.
[0071]
When the above-mentioned filtering action is continued, oxide flocs and other foreign substances accumulate on the surface of the sand filtration layer over time, and the sand filtration layer surface is covered and blocked by the flocs and other foreign substances. Although the filtration function is reduced, according to the present invention, a mechanism is provided for reciprocating the raw water supply pipe or the air supply pipe on a plane parallel to the surface of the sand filtration layer. By reciprocating the water pipe or the air supply pipe on a plane parallel to the surface of the sand filtration layer, the jet water stream or jet air stream ejected from the jet nozzle is violently beaten against the obstructed sand filtration layer surface. The clogging of the sand filtration layer surface due to foreign matter is removed by clogging with foreign matter on the entire surface of the layer. After removing the clogging of the surface of the sand filtration layer in this way, the filtered water flows back downward from above the sand filtration layer and discharges the backwashed sewage to the outside of the sand filtration layer. To completely recover.
[0072]
In one aspect of the present invention, in the water treatment apparatus, a clogging loosening bar is provided between each adjacent one of the plurality of jet nozzles such that a tip is inserted into a surface layer of a sand filtration layer. As the raw water supply pipe or air supply pipe is reciprocated on a plane parallel to the surface of the sand filtration layer during backwashing, the clogging loosening rod is inserted into the surface of the sand filtration layer. , The surface layer of the sand filtration layer is plowed by the clogging loosening rod, and the clogging on the surface of the sand filtration layer can be more effectively loosened.
[0073]
In another aspect of the present invention, a filtered water circulating means for stopping supply of raw water from the raw water pipe when the supply of filtered water is stopped and returning filtered water to the raw water pipe to circulate through the sand filtration layer. By further providing the filtered water, even during the period in which the filtered water is unnecessary and the supply of the filtered water is stopped, the filtered water is returned to the raw water supply pipe and circulated through the sand filtration layer and the aeration is continuously performed, thereby supplying the filtered water. Dissolved oxygen is sufficiently supplied to the iron bacteria and other microorganisms in the sand filtration layer even during the suspension period, so that the microorganisms are prevented from being killed or reduced due to lack of oxygen, and iron is removed from the sand filtration layer when the filtration water supply is resumed. In addition, the reduction of the manganese removing effect can be prevented.
[0074]
In another aspect of the present invention, the water treatment apparatus further includes a backwash tube embedded in the sand filtration layer, the backwash tube reverses the sand filtration layer blockage accumulated on the sand filtration layer. The sand accumulated at the upper part of the sand filtration layer is buried at a depth sufficient to remove by washing and at a depth below the backwash pipe so that a part of the sand filtration layer as thick as possible exists. The filter layer blockage is washed away by the backwash, and the sand filter layer below the backwash tube is not affected by the backwash. Therefore, the iron bacteria present in the sand filter layer below the backwash tube are removed. Other microbial communities are not destroyed, and when the operation of the device is resumed after backwashing, the effects of iron removal and manganese removal by microorganisms present in this part of the sand filtration layer are maintained and the water treatment device as a whole Can improve the iron removal and manganese removal effects
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing one embodiment of a water treatment apparatus of the present invention.
FIG. 2 is a cross-sectional view showing the position of a jet nozzle during filtration and backwashing of the embodiment.
FIG. 3 is a perspective view schematically showing another embodiment of the water treatment apparatus of the present invention.
FIG. 4 is a side view showing another embodiment of the water treatment apparatus of the present invention.
FIG. 5 is a perspective view showing another embodiment of the water treatment apparatus of the present invention.
FIG. 6 is a cross-sectional view showing the position of the jet nozzle at the time of filtration and at the time of backwashing of the embodiment.
FIG. 7 is a perspective view showing a modification of the embodiment.
[Explanation of symbols]
2 Sand filtration layer
3 Filtration tank
4 Raw water transmission pipe
5, 35 jet nozzle
20 Raw water transmission pipe reciprocating mechanism
42 Sticks for clogging

Claims (15)

  1. A raw water supply pipe, a plurality of jet nozzles each having one end communicating with the raw water supply pipe, and a raw water discharge port for discharging raw water as a jet water flow at the other end, and a raw water discharge port of the jet nozzle having a surface thereof. A sand filtration layer disposed below the jet nozzle at a predetermined interval; a filtered water outlet provided in the sand filtration layer for removing water filtered by the sand filtration layer; A mechanism for reciprocating a water pipe on a plane parallel to the surface of the sand filtration layer.
  2. 2. A clogging loosening bar is provided between the adjacent jet nozzles of the plurality of jet nozzles such that a tip is inserted into a surface layer of the sand filtration layer. Water treatment equipment.
  3. An air supply pipe, a plurality of jet nozzles having one end communicating with the air supply pipe, and an air discharge port for discharging air as a jet stream at the other end, and a surface having an air discharge port of the jet nozzle. A sand filtration layer disposed below the jet nozzle at a predetermined interval; a water pipe for supplying raw water to the sand filtration layer; and a sand filtration layer for taking out water filtered by the sand filtration layer. And a mechanism for reciprocating the air supply pipe on a plane parallel to the surface of the sand filtration layer.
  4. The clogging loosening bar is provided between the adjacent jet nozzles of the plurality of jet nozzles such that a tip is inserted into a surface layer of the sand filtration layer. Water treatment equipment.
  5. The apparatus further comprises a filtered water circulating means for stopping the supply of the raw water from the raw water feed pipe when the supply of the filtered water is stopped and returning the filtered water to the raw water feed pipe to circulate through the sand filtration layer. Item 5. The water treatment device according to any one of Items 1 to 4.
  6. The filtered water circulation means,
    A filtered water circulation pipe connecting the filtered water outlet and the raw water feed pipe,
    A water supply pump connected to the filtered water circulation pipe,
    The filtration water circulation pipe is provided in the filtration water circulation pipe, supplying the filtration water when supplying the filtration water, stopping the supply of the filtration water to the filtration water circulation pipe, stopping the filtration water supply when the filtration water supply is stopped, and filtering the filtration water. A switching valve for returning to the raw water pipe through a water circulation pipe,
    It is provided in the raw water supply path, passes raw water when supplying filtered water, and stops passing of filtered water from the filtered water circulating pipe.When stopped supplying filtered water, stops passing of raw water and feeds the filtered water from the filtered water circulating pipe. The water treatment apparatus according to claim 5, further comprising a valve means for allowing the filtered water to pass therethrough.
  7. The filtered water circulation means,
    A filtered water circulation outlet separate from the filtered water outlet,
    A filtered water circulation pipe connecting the filtered water circulation outlet and the raw water water supply pipe,
    A water supply pump connected to the filtered water circulation pipe,
    A valve that is provided in the pipeline on the filtered water outlet side and that opens when filtering water is supplied and closes when filtering water is stopped;
    It is provided in the raw water supply path, passes raw water when supplying filtered water, and stops passing of filtered water from the filtered water circulating pipe.When stopped supplying filtered water, stops passing of raw water and feeds the filtered water from the filtered water circulating pipe. The water treatment apparatus according to claim 5, further comprising a valve means for passing the filtered water.
  8. A backwash tube buried in the sand filter layer, the backwash tube having a depth sufficient to remove the sand filter layer blockage accumulated on the sand filter layer by backwash; The water treatment device according to any one of claims 1 to 7, wherein the water treatment device is buried at a depth such that a portion of a sand filtration layer as thick as possible exists below the backwash tube.
  9. When filtering raw water, jet water is jetted from the jet nozzle to perform aeration in the water on the sand filtration layer and on the surface of the sand filtration layer, and when back-rinsing the sand filtration layer, jet water is jetted from the jet nozzle. The water treatment method according to claim 1, wherein the mechanism for reciprocating the raw water supply pipe is operated while the clogging on the surface of the sand filtration layer is loosened by the jet water flow.
  10. When filtering raw water, jet water is jetted from the jet nozzle to perform aeration in the water on the sand filtration layer and on the surface of the sand filtration layer, and when back-rinsing the sand filtration layer, jet water is jetted from the jet nozzle. 3. The water treatment apparatus according to claim 2, wherein a mechanism for reciprocating the raw water supply pipe is operated while the clogging in the surface layer of the sand filtration layer is released by the jet water flow and the clogging release rod. Processing method.
  11. At the time of raw water filtration, raw water is supplied from the water pipe to the sand filtration layer, and a jet air flow is jetted from an air supply pipe to perform aeration in water on the sand filtration layer and on the surface of the sand filtration layer. When the bed is back-washed, a mechanism for reciprocating the air supply pipe while jetting a jet air flow from the air supply pipe is operated to release clogging in the surface layer of the sand filtration layer by the jet air flow. A water treatment method using the water treatment apparatus according to claim 3.
  12. At the time of raw water filtration, raw water is supplied from the water pipe to the sand filtration layer, and a jet air flow is jetted from an air supply pipe to perform aeration in water on the sand filtration layer and on the surface of the sand filtration layer. When the bed is back-washed, a mechanism for reciprocating the air supply pipe while ejecting a jet air flow from the air supply pipe is operated, and the jet air flow and the clogging loosening rod act on the surface of the sand filtration layer. The water treatment method according to claim 4, wherein clogging is released.
  13. When filtering raw water, jet water is jetted from the jet nozzle to aerate the water on the sand filter layer and on the surface of the sand filter layer, and when back-washing the sand filter layer, jet water jet from the jet nozzle 3. The water treatment apparatus according to claim 2, wherein a mechanism for reciprocating the raw water supply pipe is operated in a state in which the clogging on the surface layer of the sand filtration layer is released only by the clogging release rod. Water treatment method.
  14. At the time of raw water filtration, raw water is supplied from the water pipe to the sand filtration layer, and a jet air flow is jetted from an air supply pipe to perform aeration in water on the sand filtration layer and on the surface of the sand filtration layer. When the bed is back-washed, the mechanism for reciprocating the air supply pipe while the jet air flow from the air supply pipe is stopped is activated to operate the surface of the sand filtration layer only with the clogging loosening rod. The water treatment method according to claim 4, wherein clogging is released.
  15. When the supply of filtered water is stopped, the supply of raw water from the raw water pipe is stopped, the filtered water is returned to the raw water pipe, circulated through the sand filtration layer, and aeration is continued to dissolve the filtered water. The method according to any one of claims 9 to 14, further comprising a step of maintaining the oxygen concentration at a predetermined level.
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WO2011001819A1 (en) * 2009-06-30 2011-01-06 株式会社ナガオカ Water treatment device and method for cleaning filtration material layer for water treatment device
WO2013046930A1 (en) * 2011-09-30 2013-04-04 日立造船株式会社 Osmosis filtering method for sea water and osmosis water intake unit
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WO2010125662A1 (en) * 2009-04-30 2010-11-04 Miyazaki Toyofumi Slow filtration device having excellent ability to treat microorganisms
WO2011001819A1 (en) * 2009-06-30 2011-01-06 株式会社ナガオカ Water treatment device and method for cleaning filtration material layer for water treatment device
US9017559B2 (en) 2009-06-30 2015-04-28 Nagaoka International Corporation Water treatment apparatus and a method for cleaning a filter layer of a water treatment apparatus
JP2013071096A (en) * 2011-09-29 2013-04-22 Swing Corp Catchment
WO2013046930A1 (en) * 2011-09-30 2013-04-04 日立造船株式会社 Osmosis filtering method for sea water and osmosis water intake unit
JP2013075268A (en) * 2011-09-30 2013-04-25 Hitachi Zosen Corp Osmosis filtering method for sea water and osmosis water intake unit
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