AU2022224798A1 - Water treatment apparatus - Google Patents

Abstract

The invention provides a specific technique in the water treatment apparatus to disinfect and discharge the water to be treated so as to supply the water to be treated to the disinfection tank in an affirmative manner. The treatment tank body of the water treatment apparatus is provided with a disinfection tank 170 having a baffle portion 171a and a chemical cartridge 180. In the disinfection tank 170, a water to be treated transferring pump 192 discharges the water to be treat in the first direction. The baffle portion 171a changes the water flowing direction to the second direction different from the first direction and supplies to the chemical cartridge 180. Representative drawing: Fig. 8 2/9 C U') _00 oo -' CNCJ U') U'

Description

2/9

C U')

_00

oo -'

CNCJ U') U'

Specification

[Title of the invention]

Water Treatment Apparatus

[0001]

This application claims priority from Japanese Patent Application 2021-178217 filed on

29 October 2021, the contents of which are to be taken as incorporated herein by this

reference.

[Technical Field]

[0002]

The invention relates to a water treatment apparatus for treating sewage such like domestic

wastewater.

[Background art]

[0003]

The discussion of the background to the invention herein is intended to facilitate an

understanding of the invention. However, it should be appreciated that the discussion is not an

acknowledgement or admission that any aspect of the discussion was part of the common

general knowledge as at the priority date of the application.

[0004]

According to a known septic tank, water after the predetermined treatment is transferred to a

disinfection tank and then, after being disinfected, the treated water is discharged to the outside.

For example, Japanese utility model laid-open HO1-139894 discloses a specific structure of the

disinfection tank within the septic tank.

According to this disinfection tank, the water to be treated is transferred in a natural manner

from the upper stream side to the disinfection tank according to the predetermined water level within the septic tank. And the water to be treated is contacted with a chemical cartridge disposed in the disinfection tank having a disinfectant. Thus, the water to be treated is disinfected.

[0005]

On the other hand, having regard to the recent viewpoint of a sophisticated treatment by the

septic tank, a technique is necessarily required to provide with a water transferring device such

like an air lift pump and so on, in order to supply the water to be treaded to the disinfection tank

without depending on the water level within the septic tank. Thus, it is required to improve

the disinfection treatment and the dischargement in an affirmative manner.

[0006]

In this respect, according to the known septic tank as explained above, the negative aspect

regarding the affirmative supply of the water to be treated to the disinfection tank is not well

considered for coping. Therefore, with respect to the sophistication of the water treatment in

the septic tank, further improvement is desired.

[Prior art references]

[Patent reference]

[0007]

[Patent reference 1]

Japanese utility model HO1-139894

[Summary of the invention]

[Summary of the invention]

[0008]

It is desirable to provide with a specific technique in the water treatment apparatus to disinfect

and discharge the water to be treated so as to supply the water to be treated to the disinfection

tank in an affirmative manner.

[0009]

According to the preferred embodiment of the water treatment apparatus according to the

invention, a water treatment apparatus is provided for a water treatment in which the water to

be treated includes sludge.

According to one aspect of the present invention there is provided a water treatment apparatus

for the water to be treated including sludge comprising;

an inflow tank to which the water to be treated is led (introduced),

an anaerobic treatment tank disposed at a downstream side of the inflow tank, the anaerobic

treatment tank serves anaerobic treatment to the water to be treated,

an aerobic treatment tank disposed at a downstream side of the anaerobic treatment tank, the

aerobic treatment tank is to serve aerobic treatment to the water to be treated,

a disinfection tank disposed at a downstream side of the aerobic treatment tank, the disinfection

tank serves disinfection treatment to the water to be treated,

a baffle portion disposed at the disinfection tank,

a chemical cartridge disposed at a predetermined position in the disinfection tank, wherein the

chemical cartridge houses the disinfectant for the water to be treated such that the disinfectant

contacts with and dissolves to the water to be treated,

a water to be treated transferring pump to transfer the water to be treated to the disinfection tank,

wherein the water to be treated transferring pump discharges the water to be treated in a

predetermined first direction,

and the baffle portion changes the flowing direction of the water to be treated in a second

direction different from the first direction to supply the water to be treated to the chemical

cartridge.

[0010]

In a case to use the water to be treated transferring pump to the disinfection tank in an affirmative

manner, it may possibly occur that the flowing speed of the water to be treated is increased due

to such affirmative transfer. As a result, the consumption speed of the disinfectant within the

disinfection tank possibly unnecessarily becomes high resultantly to cause a shortage of the

disinfectant, due to such strengthened water flow. The invention can effectively prevent such

situation before it takes place, by adopting the baffle portion.

Specifically, the baffle portion changes the flowing direction of the water to be treated in a

second direction different from the first direction to supply to the chemical cartridge.

[0011]

By such construction, even when the water to be treated with relatively high speed is discharged

into the disinfection tank by the water to be treated transferring pump, the baffle portion changes

the flowing direction from the first direction to the second direction to decrease the flowing

speed of the water to be treated and contact with the disinfectant. Therefore, any events that

the consumption speed of the disinfectant is unnecessarily increased and the disinfectant

unintentionally runs short.

[0012]

Note that it is sufficient to arrange the baffle portion at least being able to change the flowing

direction of the water to be treated. Typically, a flat shaped baffle plate can be used for the

baffle portion. Otherwise, curved shaped baffle plate can be used for the baffle portion by

adjusting the curvature to enhance the preciseness of the direction change. Or a tubular shaped

baffle portion and/or any combination of these elements can be used for the baffle portion.

Further, as to the water to be treated transferring pump, an air lift pump can typically be used,

while, for example, an underwater pump can also be used.

It might happen that stagnation is generated partly in the water to be treated and thus, flowing retention takes place. However, in such a case, when flowing direction of the water to be treated can be changed as seen in a macroscopic manner (macroscopically) from the first direction to the second direction, it is embraced within the scope of the invention.

[0013]

Further, as one of preferable aspects of the invention, the baffle portion may be provided with a

tank wall of (to form) the disinfection tank.

By having the tank wall of the disinfection tank also a function of the baffle portion, the

component element of the disinfection tank and the flowing direction changing device of the

water to be treated can be realized by a single member. As a result, further rationalization of

the component parts can be achieved.

[0014]

Further, as one of preferable aspects of the invention, the flowing direction changing angle of

the water to be treated by the baffle portion may be set to be 90 degrees or more. By setting

the flowing direction changing angle in a large scale, the water to be treated affirmatively

supplied to the disinfection tank by the water to be treated transferring pump can sufficiently be

decelerated and the consumption control of the disinfectant can be further improved.

Note that, same with the above-explained aspect, the invention relates to the drainage (sewerage,

sewage or waste water). Therefore, if the flowing direction of the water to be treated can be

changed as seen in a macroscopic manner (macroscopically) by 90 degrees or more, it is

sufficient for exploiting the aspect of the invention. For example, even when the stagnation

partly takes place in the water to be treated in the disinfection tank to partly cause flowing

retention, it can be embraced within the scope of the invention if the flowing direction of the

water to be treated is entirely changed by 90 degrees or more.

Same with that, even when the changing angle is less than 90 degrees in part, it can be embraced

within the scope of the invention if the flowing direction of the water to be treated is entirely changed by 90 degrees or more.

[0015]

Further, as one of preferable aspects of the invention, a treated water tank may be disposed at a

downstream side of the aerobic treatment tank and at an upper stream side of the disinfection

tank. Further, the water to be treated transferring pump may be arranged to transfer the water

to be treated in the treated water tank to the disinfection tank.

By providing the treated water tank at the upper stream side of the disinfection tank, further

subsidence of the sludge and further remove of the SS (suspended solid) can be improved. As

result, the disinfection effect at the disinfection tank can be improved. Especially for the

affirmative supply of the water to be treated to the disinfection tank by using a water to be treated

transferring pump such like the invention, it is preferable to provide the treated water tank for

calming down the water to be treated after the anaerobic treatment and the aerobic treatment.

[0016]

Further, as one of preferable aspects of the invention, the chemical cartridge may be provided

with a plurality of cartridge bodies in each of which a disinfectant is equipped. Further, the

water to be treated the flowing direction of which is changed by the baffle portion may be

sequentially transferred to the plurality of cartridge bodies.

By providing a plurality of cartridge bodies, the amount of dissolution at each chemical cartridge

can be appropriately controlled and thus, disinfection treatment can be precisely controlled.

Note that, as to the plurality of cartridge bodies, typically the same type can be utilized, while it

can be utilized with different amount of disinfectant at each chemical cartridge body.

[Effect of the invention]

[0017]

According to the invention, in the water treatment apparatus to disinfect and discharge the water

to be treated, a specific technique is provided to supply the water to be treated to the disinfection tank in an affirmative manner.

[0018]

[Fig. 1]

Fig. 1 is a schematic front view showing an outline of the water treatment apparatus

according to the representative embodiment of the present invention.

[Fig. 2]

Fig. 2 is a cross sectional view at the A-A line in Fig. 1. Fig. 2 is a schematic front view

showing an outline of the water treatment apparatus.

[Fig. 3]

Fig 3 shows a treatment flow of the water to be treated in the water treatment apparatus.

[Fig. 4]

Fig. 4 is a schematic front view showing the structure of a disinfection tank of the water

treatment apparatus according to the representative embodiment.

[Fig. 5]

Fig. 5 is a schematic perspective view showing the structure of the disinfection tank of the water

treatment apparatus according to the representative embodiment.

[Fig. 6]

Fig. 6 is a front view showing the structure of a chemical cartridge used in the disinfection tank.

[Fig. 7]

Fig. 7 is a schematic view showing the detail of transferring the water to be treated by a second

air lift pump.

[Fig. 8]

Fig. 8 is a schematic plan view showing the flow state of the water to be treated within the

disinfection tank.

[Fig. 9]

Fig. 9 is a schematic front view showing the flow state of the water to be treated within the

disinfection tank.

[Embodiment to exploit the present invention]

[0019]

A water treatment apparatus according to the embodiment of the present invention is now

explained with reference to FIGS. 1 to 9. According to the embodiment of the present

invention, a water treatment apparatus 100 for receiving and treating raw water (also referred to

as "wastewater" or "water to be treated") discharged from general houses and apartment houses

in a water treatment region is explained.

[0020]

(Entire structure of the water treatment apparatus 100)

Fig. 1 is a plane view of the water treatment apparatus 100. And Fig. 2 is a front view of the

water treatment apparatus 100 (The cross-sectional view at the A-A line of Fig. 1).

The water treatment apparatus 100 includes a treatment tank body 101 that defines the body

structure (outer body) of the water treatment apparatus 100.

As shown in Fig .1 and Fig. 2, the treatment tank body 101 is substantially formed as a

rectangular shape in a plane view. The treatment tank body 101 includes a side wall 10la and

a 101b which are parallel to each other, a side wall 101c and a 101d which are parallel to each

other, and a bottom wall 101e and a top wall 101f.

The water treatment apparatus 100 according to the embodiment is configured to treat domestic

wastewater (domestic sewage) together with excrement.

[0021]

The treatment tank body 101 is provided with a inlet pipe 102 and an outlet pipe 103.

The inlet pipe 102 is provided as an opening portion to introduce the water to be treated (raw

water) into the inner space of the treatment tank body 101.

The outlet pipe 103 is provided as an opening portion to discharge the treated water from the

inner space of the treatment tank body 101.

Further, the treatment tank body 101 includes a manhole portion 104. The manhole portion

104 is provided as a part in which a manhole for an entrance, internal inspection and cleaning is

formed.

[0022]

(Definition of component parts and directions of the water treatment apparatus)

The manhole portion 104 side (the upper wall 101f side) of the treatment tank body 101 is

defined as a tank upper side or a tank upper part, and the opposite side (the bottom wall 101e

side) as a tank lower side, a tank lower part or a tank bottom part.

Further, the inlet pipe 102 side (the side wall side 101c) of the treatment tank body 101 is defined

as an upper stream side, and the outlet pipe 103 side (the side wall side 101d) is defined as a

downstream side.

Further, in Fig. 2, the direction in line with the extending face of the manhole portion 104 is

defined as a horizontal direction (also referred to as a tank front rear direction) and the direction

crossing the horizontal direction is defined as a vertical direction (tank upper lower direction).

Moreover, the direction perpendicular to the face of Fig. 2 (the direction perpendicular both to

the tank front rear direction and to the tank upper lower direction and the upper lower direction

in Fig 1) is defined as a tank right left direction. Note that the arrow line in each Figure shows

the flow of the water to be treated.

[0023]

As shown in FIG. 1, in the internal space of the treatment tank body 101, a water treatment

region is formed for performing a predetermined water treatment while storing raw water introduced (led) in through the inlet pipe 102. In this water treatment region, a sedimentation separation tank 120, a cleaning hole 130, an anaerobic treatment tank 140, an aerobic treatment tank 150, a treated water tank 160 and a disinfecting tank 170 are formed, respectively.

[0024]

As shown in FIG. 2, wastewater led into the treatment tank body 101 (an inflow baffle 110)

through the inlet pipe 102 is treated in the sedimentation separation tank 120, the anaerobic

treatment tank 140, the aerobic treatment tank 150, the treated water tank 160 and the

disinfecting tank 170 in sequence, and thereafter discharged out of the treatment tank body 101

through the outlet pipe 103.

Further, it is configured such that water to be treated circulates between the sedimentation

separation tank 120 and the cleaning hole 130 and between the anaerobic treatment tank 140

and the aerobic treatment tank 150. The water treatment apparatus 100 may be configured as

a septic tank which releases water discharged out of the treatment tank body 101 as it is, or as a

water recycling apparatus for reusing water discharged out of the treatment tank body 101 as

water for flushing toilets or watering.

[0025]

The inflow baffle 110 forms an uppermost upstream region in the water treatment region.

Wastewater led into the inflow baffle 110 through the inlet pipe 102 flows into the sedimentation

separation tank 120. The water is then separated into solid and liquid in the sedimentation

separation tank 120, and a solid component separated from the water is deposited as precipitated

sludge on the bottom of the sedimentation separation tank 120. Wastewater is first led into the

inflow baffle 110 and then indirectly led into the sedimentation separation tank 120, so that

sludge precipitated in the sedimentation separation tank 120 is prevented from being agitated.

The sedimentation separation tank 120 having the inflow baffle 110 is an example embodiment

that corresponds to the "inflow tank" according to this invention.

[0026]

As shown in FIGS. 1 and 3, a partition wall 105 is provided between the sedimentation

separation tank 120 and the anaerobic treatment tank 140 on the downstream side thereof and

extends in the tank vertical direction. The partition wall 105 is mounted to the side walls 101a,

101b and the bottom wall 101e.

At the upper region of the partition wall 105, an opening portion 105a and an inflow baffle 107

are provided to communicate the sedimentation separation tank 120 and the anaerobic treatment

tank 140. This inflow baffle 170 is also defined as an outflow baffle.

The water to be treated in the sedimentation separation tank 120 is transferred to the downstream

side to the anaerobic treatment tank 140 through the opening portion 105a and the inflow baffle

107.

The anaerobic treatment tank 140 according to the embodiment is an example of the "anaerobic

treatment tank" according to the invention.

[0027]

At an intermediate region in the upper lower direction of the anaerobic treatment tank 140, an

anaerobic filter bed 144 is provided so as to be supported by the treatment tank body 101. The

anaerobic filter bed 144 is filled with a prescribed amount of anaerobic filter media to which

anaerobic microorganisms for anaerobically treating organic pollutant adhere. As the

anaerobic filter media, plate-like filter media and ball-like skeleton filter media may be suitably

used. In the anaerobic filter bed 144, water to be treated is anaerobically treated and filtered,

so that BOD (biochemical oxygen demand) is reduced and SS (suspended solids) is removed.

[0028]

As shown in Fig. 1 and Fig. 2, a partition wall 106 is provided between the anaerobic treatment

tank 140 and the aerobic treatment tank 150 located at the downstream of the anaerobic

treatment tank 140. The partition wall 106 extends in the upper lower direction. The partition wall 106 is provided with an inflow baffle 108 and an opening portion 106a to communicate the anaerobic treatment tank 140 with the aerobic treatment tank 150.

The water to be treated in the anaerobic treatment tank 140 is transferred to the aerobic treatment

tank 150 at the downstream side of the anaerobic treatment tank 140 through the inflow baffle

108 and the opening portion 106a.

The inflow baffle 108 and the opening portion 106a are disposed at the upper stream side of the

treatment tank body 101. Thus, the water to be treated in the anaerobic treatment tank 140 is

transferred to the aerobic treatment tank 150 from the upper stream side.

Note that, in Fig. 2, the water lever WL of the water to be treated in the treatment tank body 101

is just the same height with the height of the inflow baffle 108. Therefore, Fig. 2 shows a state

that the water to be treated which is anaerobically treated in the anaerobic treatment tank 140 is

able to be transferred to the aerobic treatment tank 150.

[0029]

As shown in Fig. 1, at the downstream side of the partition wall 106, the aerobic treatment tanks

150, 150 are respectively provided both at the right and the left side regions with respect to the

right and left direction. Also, the treated water tank 160 is provided at the central region.

Note that, while it is not explicitly shown in the drawings, the aerobic treatment tanks 150, 150

at the right side region and the left side region are communicated to each other at the lower

region across the treated water tank 160. And the lower region of the aerobic treatment tank

150 is communicated with the water treatment tank 160.

[0030]

In the aerobic treatment tank 150, aerobic filter bed portion 151 is provided to which aerobic

microorganisms for aerobically decomposing (aerobically treating) organic pollutant in the

water to be treated adhere. The aerobic filter bed portion 151 includes a net like block body

filter bed 151a and a net like granular body filter bed 151b. The net like block body filter bed

151a is disposed above the net like granular body filter bed 151b.

[0031]

The net like block body filter bed 151a is formed of a net like and a block-like (single) filter

medium. Specifically, the block like filter medium is a net which is formed of wire rods made

of resin such as polypropylene and polyethylene and three-dimensionally entangled with each

other, and is formed in one piece like a block. Thus, as a result, the net like block body filter

bed 151a serves as a lid to prevent the filter media of the lower net like granular body filter bed

151b from flowing out. The net like block body filter bed 15la is held by a net, a plate-like

member or other similar holding member supported by the treatment tank body 101. Further,

the aerobic filter medium of the net like block body filter bed 151amay be shaped otherwise, for

example, into a plate-like form, as long as it is formed in one piece.

[0032]

The net like granular body filter bed 151b is formed of a plurality of net-like rolledfilter medias.

Specifically, the net-like rolled filter mediums may be a net which is formed of wire rods made

of resin such as polypropylene and polyethylene and three-dimensionally entangled with each

other, and is formed into a cylindrical shape having a diameter of about 100 mm and a length of

about 100 mm.

Note that, as the net like granular body filter bed 151b, net-like, spherical or plate-like filter

media, or filter media formed of porous material may be used.

[0033]

At the lower region of the aerobic treatment tank 150, namely at the lower region of the net like

granular body filter bed 151b, an air supply device 152 is provided. The air (oxygen) provided

by the air supply device 152 is supplied to the net like granular body filter bed 15lb and then,

to the net like block body filter bed 151a in a sequential manner.

As a result of this aspect, the water to be treated in the aerobic treatment tank 150 is aerobically treated by the air supplied from the air supply device 152. The water to be treated which is aerobically treated is transferred from the lower region of the aerobic treatment tank 150 to the treated water tank 160.

Note that, at the same height position with the air supply device 152, a support frame 153 is

provided to support the lower region of the aerobic treatment tank 150.

[0034]

As shown in Fig. 1 and Fig. 2, the treated water tank 260 is provided with a first air lift pump

191. An intake portion of the first air lift pump 191 is disposed at the lower region of the

treated water tank 160.

Apart of the water to be treated which is transferred from the aerobic treatment tank 150 to the

treated water tank 160 through the first air lift pump 191 is led (introduced) by the intake portion

at the region to be transferred into the treated water tank 160. And then, the water to be treated

is fed back to the intake baffle 110 through the feedback passage 191a.

As a result, the water to be treated within the water treatment apparatus 100 is circulated though

the intake baffle 110, the sedimentation separation tank 120, the anaerobic treatment tank 140

and the aerobic treatment tank 150. Having regard to these aspects, the first air lift pump is

able to be called as a "circulation pump".

[0035]

As shown in Fig. 1 and Fig. 2, the disinfection tank 170 is disposed at the upper region of the

treated water tank 160. The disinfection tank 170 is divided from the treated water tank 160

by a division wall 171. The division wall 171 can be defined as a "Disinfection tank forming

wall".

Further, the treated water tank 160 is provided with a second air lift pump 192. The second air

lift pump 192 transfers the water to be treated within the treated water tank 160 to the

disinfection tank 170 so as to discharge to the outside over the disinfection treatment. Having regard to these aspects, the second air lift pump 192 can be defined as a "discharge pump".

As is shown in Fig. 5, the second air lift pump 192 is mainly structured by a pump body 193, a

suction portion 194 and a discharge portion 195. The pump body 193 has a U-bent tubular

shape. The suction portion 194 inhales the water to be treated within the water treated tank

160. The discharge portion 195 discharges the water to be treated to the disinfection tank 170.

[0036]

The air supply device 152, the first air lift pump 191, the second air lift pump 192 and the

feedback passage 191a are integrally made in a concatenated manner within the treatment tank

body 101 respectively by utilizing a resin pipe shaped material.

Note that the first air lift pump 191, the second air lift pump 192 and the air supply device 152

are respectively communicated to a predetermined air supplying apparatus which are not

specifically shown in the drawings. And thus, by opening and closing the air valve of the air

supplying apparatus, the supply and cut of the air can be switched. Note that the air valve is

controlled by a manual operation or by a controller (not specifically shown in the drawings).

[0037]

Fig. 3 shows a water treatment routine as a block diagram at each treatment tank according to

the representative embodiment. Specifically, the water to be treated in the water treatment

apparatus 100 is led (introduced) into the treatment tank body 101 through the inlet pipe. The

water to be treated is respectively treated at the inflow baffle 110, at the sedimentation separation

tank 120, at the anaerobic treatment tank 140, at the aerobic treatment tank 150, at the treated

water tank 160 and at the disinfection tank 170. And then, the treated water is discharged from

the outlet pipe 103 to the outside.

Further, a part of the water to be treated which is aerobically treated at the aerobic treatment

tank 150 is fed back from the treated water tank 160 to the inflow baffle 110 by the first air lift

pump 191 so as to have further water treatment. As a result, BOD (Biochemical Oxygen

Demand) can further be reduced and SS (Suspended solids) can further be removed.

[0038]

Further, the water to be treated stored in the treated water tank 160 is affirmatively transferred

to the disinfection tank 170 by the second air lift pump 192 to have the disinfection treatment.

Then, the water to be treated is discharged from the outlet pipe 103 to the outside.

The terminology of "affirmative transfer" is defined by an aspect such that the water to be treated

is transferred by applying kinetic energy to the water to be treated by means of a fluid machine

without respect to the water level. This is that the terminology "affirmative transfer" is an

antonym for the aspect that the water to be treated is transferred to the disinfection tank 170 in

accordance with the water level.

[0039]

(Regarding the disinfection tank 170)

Next, the structure of the disinfection tank 170 as one of characteristic aspects of the

representative embodiment is explained in greater detail in reference to Fig. 4 to Fig. 9.

As is explained above, the disinfection tank 170 is disposed at the upper region of the treated

water tank 160. The disinfection tank 170 provides a disinfection treatment to the water to be

treated which is transferred to the disinfection tank 170 by the second air lift pump 192 in order

to discharge the disinfected water to be treated to the outside of the water treatment apparatus

100.

Detailed structure of the disinfection tank 170 is shown in Fig. 4 and Fig. 5. Note that in these

figures, because the disinfection tank 170 is located at the upper region of the treated water tank

160, the treated water tank 160 is shown only with a numeral reference and the entire structure

of which is not explicitly shown in these figures when the structure of the disinfection tank 170

should be shown in detail.

The disinfection tank 170 is divided by the division wall 171 (disinfection tank forming wall).

A chemical cartridge housing portion 172 and a water to be treated storage portion 174 are

generally integrally provided.

[0040]

The chemical cartridge housing portion 172 includes a concave portion 172a the upper region

of which is opened. A chemical cartridge 180 is provided at the concave portion 172a. As to

the chemical cartridge 180, three same types of tubular bodies are placed adjacent to each other

(first, second and third chemical cartridges 180a, 180b and 180c). In other words, according

to the representative embodiment, the same types of three chemical cartridges (cartridge bodies)

are utilized.

The second air lift pump 192 is displaced adjacent to (in the vicinity of) the chemical cartridge

housing portion 172. The water to be treated can be led to the concave portion 172a by the

second air lift pump 192. And the water to be treated led to the concave portion 172a can be

contacted with the lower portion of the chemical cartridge 180.

[0041]

The water to be treated storage portion 172 is provided as a concaved space being deeper in the

upper lower direction. The water to be treated to which the disinfection treatment has already

made can be stored in the concaved space. Further, a discharge opening portion 175 is formed

at the upper region of the water to be treated storage portion 174. Thus, when the water level

of the water to be treated in the water to be treated storage portion174 reaches the discharge

opening portion 175, the water to be treated in the water to be treated storage portion 174 can

be moved to the outside of the disinfection tank 170 through the discharge opening portion 175.

The discharge opening portion 175 is communicated with the outlet pipe 103 as shown in Fig.

1 and Fig. 2 and the water to be treated is discharged from the water treatment apparatus 100.

Note that any other tank such like a discharge pump tank with a discharge pump can be provided

at the downstream of the disinfection tank 170.

[0042]

The baffle portion 173 is provided between the chemical cartridge housing portion 172 and the

water to be treated storage portion 174. By the baffle portion 173, the water to be treated led

to the concave portion 172a of the chemical cartridge housing portion 172 is prevented from

immediately moving to the water to be treated storage portion 174. To the contrary, the water

to be treated stays at the concaved portion 172a and thus, sufficient time to contact with the

chemical cartridge 180 can be secured.

Not that a communicating opening portion 173a is formed at the baffle portion 173 as shown in

Fig. 8 wherein the disinfection tank 170 is viewed as a plain view. As a result, the water to be

treated which has been sufficiently disinfected can be transferred to the water to be treated

storage portion 174 through the communicating opening portion 173a.

[0043]

Fig. 6 shows the detailed structure of the chemical cartridge 180 as a front view.

The chemical cartridge 180 is formed as an elongated tubular hollow body to have a chemical

cartridge main body 181, a dissolving amount controlling portion 182 and a disinfectant

exposing portion 184.

The chemical cartridge main body 181 is structured to house the disinfectant 183 within the

hollow inner space. According to the representative embodiment, the disinfectant 183 is

provided with a plurality of tablets comprising sodium hypochlorite (disinfecting preparation)

which are sequentially accumulated. In this representative embodiment, each tablet is

structured to have a cylindrical shape with a diameter of 80 millimeter, a height of 30 millimeter

and twelve tablets at maximum can be equipped. The tablet at the lowermost position of the

disinfectant 183 is placed to face with the outside from the disinfectant exposing portion 184

such that the disinfectant 183 can be contacted with the water to be treated.

The area of the exposure of the disinfectant exposing portion 184 to the outside can be arbitrarily manually adjusted by operating the dissolving amount controlling portion 182. Specifically, by a rotating operation of the dissolving amount controlling portion 182 around the longitudinal axis of the chemical cartridge 180, the area of the exposure of the disinfectant exposing portion

184 can be changed. When the area of the exposure is increased, the exposure area to the water

to be treated is increased and the dissolution of the disinfectant can be promoted. To the

contrary, when the area of the exposure is decreased, the exposure area to the water to be treated

is decreased and the dissolution of the disinfectant can be reduced.

[0044]

Fig. 7 schematically shows a state that the water to be treated is transferred from the treated

water tank 160 to the disinfection tank 170 by the second air lift pump as a front view.

Note that, as explained above, the flow of the water to be treated is shown by an arrow in the

drawings.

The suction portion 194 of the second air lift pump 192 is located substantially at the same

height with the bottom portion of the disinfection tank 170 in the treated water tank 160. On

the other hand, the discharge portion 194 of the second air lift pump 192 is located higher than

the position of the suction portion 194 by the predetermined amount. As a result, the difference

in height is defined as the pump head.

[0045]

Further, Fig. 8 schematically shows a state that the water to be treated is transferred from the

treated water tank 160 to the disinfection tank 170 by the second air lift pump 192 and then,

flows within the disinfection tank 170 as a front view.

Note that, as the same with Fig. 7, the flow of the water to be treated is shown by an arrow in

the drawings.

The water to be treated transferred from the discharge portion 195 of the second air lift pump

192 to the disinfection tank 170 is to contact with the inner wall face of the division wall 171 at the concave portion 172a such that the flowing direction is changed by the inner wall face and then, heads (flows) to the chemical cartridge 180 within the concave portion 172a.

In other words, the water to be treated in the disinfection tank 170 is arranged that its flowing

direction is changed by means of a reflection at the division wall 171 from the first direction

from the discharge portion 195 of the second air lift pump 192 to the division wall 171, to the

second direction (different from the first direction) from the division wall 171 to the chemical

cartridge 180.

[0046]

According to the representative embodiment, the area of the division wall 171 to change the

flowing direction of the water to be treated does not only defines the disinfection tank 170 but

also defines the baffle portion 171a (a baffle plate and/or a baffle wall) as a flowing direction

changing device for the water to be treated.

Namely, the baffle portion 171a of the division wall 171 is a component element parts of the

disinfection tank 170 and also is an element part corresponding to "baffle portion" according to

the invention.

Note that, according the representative embodiment, the division wall 171 of the disinfection

tank 170, namely the tank wall is utilized for the direction changer of the water to be treated.

On the other hand, any other baffle device separately from the division wall 171 can be applied.

In such a case, for example, plate like baffle plate, curved baffle plate or a combination thereof

can be applied.

[0047]

Because the flowing direction of the water to be treated is changed from the first direction to the

second direction, the water to be treated reaches the chemical cartridge 180 in a state the flowing

speed is decreased (in a state that the water potential is decreased).

Therefore, as shown in Fig. 6, the flowing speed of the water to be treated when contacting with the disinfection exposing portion 184 of the chemical cartridge 180 is relatively highly decreased in comparison with the case that the water to be treated is directly flows to the chemical cartridge from the discharge portion 195 of the second air lift pump 192.

[0048]

As a result, the water to be treated contacts with the disinfectant 183 relatively in a "gentle"

manner. Thus, unintended increase of the dissolution speed of the disinfectant 183 can be

prevented and resultantly, the consumption control of the disinfectant 183 can be optimized.

Note that, having regard to the consumption control, the direction change from the first direction

to the second direction may preferably be more than 90 degrees in order for sufficient speed

decreasing. For example, in this representative embodiment, as shown in Fig. 8, the water to

be treated led to the left in Fig. 8 contacts with the baffle portion 171a (namely, division wall

171) and then, the direction is changed more than 90 degrees so as to decrease the flowing speed

and as a result, the water to be treated flows to the upper right direction in Fig. 8 to reach the

chemical cartridge 180.

In other words, according to the representative embodiment, the left direction in Fig. 8 is defined

as the first direction and the right direction in Fig. 8 is defined as the second direction.

[0049]

Further, as shown in Fig. 8, the water to be treated, the flowing direction of which is changed

from the first direction to the second direction in the disinfection tank 170, is sequentially to

contact with the first chemical cartridge 180a, the second chemical cartridge 180b and the third

chemical cartridge 180c in this order, due to the relationship with the flowing direction changing

device. Therefore, by appropriately adjusting the dissolving speed of the disinfectant at each

chemical cartridge 180, the entire consumption speed of the disinfectant for the chemical

cartridge 180 can be delicately controlled.

For example, with respect to the first chemical cartridge 180a which is disposed at the closest location to the flowing direction changing device, the dissolution speed may preferably be adjusted relatively low. In other words, the opening area of the disinfectant exposing portion

184 of the first chemical cartridge 180a may preferably be set as small.

On the other hand, with respect to the third chemical cartridge 180a which is disposed at the

remotest location from the flowing direction changing device, the dissolution speed may

preferably be adjusted relatively high, because the flowing distance of the water to be treated

becomes relatively longer and thus, the flowing speed becomes relatively slower. In other

words, the opening area of the disinfectant exposing portion 184 of the third chemical cartridge

180c may preferably be set as large.

And then, with respect to the second chemical cartridge 180b, the dissolution speed may

preferably be adjusted at the intermediate level.

[0050]

As shown in Fig. 9, the water to be treated to which the disinfection treatment is made by the

chemical cartridge 180 is transferred in the disinfection tank 170 to the water to be treated

storage portion 174 through the baffle portion 173. Thereafter, when reaching the water level

of the discharge opening portion 175 at the water to be treated storage portion 174, the water to

be treated is discharged from the discharge opening portion 175 to the outside of the disinfection

tank 170 and then, discharged from the outlet pipe 103 as shown in Fig. 1 and Fig. 2 to the

outside of the water treatment apparatus 100.

[0051]

With respect to the affirmative transferring of the water to be treated from the treated water tank

160 to the disinfection tank 170 by using a second air lift pump 192, there might be a concern

that the transferring speed of the water to be treated to the disinfection tank 170 is too fast so as

to cause the unintentional fast consumption of the disinfectant. However, according to the

representative embodiment, the flowing direction of the water to be treated is changed to decrease the flowing speed and hen, the water to be treated contacts with the chemical cartridge

180. Therefore, such concern can be alleviated.

Specifically, once the water treatment apparatus 100 periodically inspected, it will not be

maintained till to the next periodical inspection. In this connection, unintentional fast

consumption of the disinfectant should be avoided as much as possible. According to the

representative embodiment, such trouble can be avoided before it happens. Therefore, it is

effective with respect to the environmental load.

Further, according to the water treatment apparatus 100, the division wall 171 as itself is used

for the flowing direction changing device of the water to be treated. Thus, it is not necessary

to prepare any exclusive parts for the flowing direction change and parts composition can be

well rationalized.

[0052]

Further, if the technical purpose is only to decrease the flowing speed of the water to be treated,

an overflow weir on the flowing passage, for example, can be used. However, in such a case,

it is necessary to secure the passage with certain distance before the overflow and after the

overflow, respectively. It is not effective in line with the space design efficiency. According

to the representative embodiment, the flowing direction of the water to be treated is changed in

order to decrease the flowing speed (especially direction change by 90 degrees or more). As a

result, space saving design in the disinfection tank 170 is realized.

[0053]

It might happen that stagnation is generated partly in the water to be treated and thus, flowing

retention takes place. However, in such a case, when flowing direction of the water to be

treated can be changed as seen in a macroscopic manner (macroscopically) from the first

direction to the second direction by the baffle portion 171a, sufficient effect can be resulted.

[0054]

By the water treatment apparatus 100 according to the representative embodiment, when the

water to be treated is affirmatively transferred to the disinfection tank 170, the problem that

might be occur as a trade-off of such affirmative transfer can be avoided before it happens. As

a result, a specific technique for such affirmative transferring is provided.

[0055]

Note that, in the representative embodiment, the water treatment apparatus 100 is provided with

an air lift pump. However, as a fluid machine instead of the air lift pump, an underwater pump,

for example, can be used. In this case, the controller may control total amount of transfer of

the water to be treated by the underwater pump, for example, in accordance with the change of

the water level.

[0056]

Further, the water treatment apparatus 100 according to the representative embodiment is

provided with the inflow baffle 110, the sedimentation separation tank 120, the anaerobic

treatment tank 140, the aerobic treatment tank 150, the treated water tank 160 and the

disinfection tank 170. In this regard, total quantity and type of treatment element can be

appropriately selected in accordance with the necessity.

[0057]

Moreover, the above-explained representative embodiment is explained by adopting the water

treatment apparatus 100 for treating the raw water discharged from general houses and

apartment houses. On the other hand, other than the general houses and apartment houses, the

invention is applicable to a water treatment apparatus for treating the raw water discharged from,

for example, the equipment of commercial facility, public facility and plant.

[0058] Where any or all of the terms "comprise", "comprises", "comprised" or "comprising"

are used in this specification (including the claims) they are to be interpreted as specifying the

presence of the stated features, integers, steps or components, but not precluding the presence

of one or more other features, integers, steps or components.

[0059]

(Relationship between each element of the representative embodiment and each element of the

invention)

The representative embodiment as explained above is an example for exploiting the invention.

Therefore, the invention is not limited to the structure of the representative embodiment.

Following is the relationship between each element of the representative embodiment and each

element of the invention.

The water treatment apparatus 100 is an example of "water treatment apparatus" of the invention.

The inflow baffle 110 is an example of "inflow tank" of the invention.

The Sedimentation separation tank 120 is an example of "inflow tank" of the invention.

The anaerobic treatment tank 140 is an example of "anaerobic treatment tank" of the invention.

The aerobic treatment tank 150 is an example of "aerobic treatment tank" of the invention.

The treated water tank 160 is an example of "treated water tank" of the invention.

The disinfection tank 170 is an example of "disinfection tank" of the invention.

The baffle portion 171a is an example of "baffle portion" of the invention.

The chemical cartridge 180 is an example of "chemical cartridge" and "cartridge body" of the

invention.

The second air lift pump 192 is an example of "water to be treated transferring pump" of the

invention.

[Explanation of Numeral References]

[0060]

100: Water treatment apparatus

101: Treatment tank body

101a: Side wall

101b: Side wall

101c: Side wall

101d: Side wall

101e: Bottom wall

If: Upper wall

102: Inlet pipe

103: Outlet pipe

104: Manhole portion

105: Partition wall

105a: Opening portion

106: Partition wall

106a: Opening portion

107: Inflow baffle

108: Inflow baffle

110: Inflow baffle

120: Sedimentation separation tank

140: Anaerobic treatment tank

141: Anaerobic chamber

150: Aerobic treatment chamber

151: Aerobic filter bed portion

151a: Net-like block body filter bed

151b: Net-like granular body filter bed

152: Air supply device

153: Support frame

160: Treated water tank

170: Disinfection tank

171: Division wall (Disinfection tank forming wall)

171a: Baffle portion (Baffle plate, Baffle wall)

172: Chemical cartridge housing portion

172a: Concave portion

173: Baffle portion

174: Water to be treated storage portion

175: Discharge opening portion

180 (180a, 180b, 180c) Chemical cartridge

181: Chemical cartridge main body (Disinfectant housing portion)

182: Dissolving amount controlling portion

183: Disinfectant (Disinfecting Preparation, Tablet)

184: Disinfectant exposing portion

191: First air lift pump (Recirculation pump)

191a: Feedback passage

192: Second air lift pump (Discharge pump)

193: Pump body

194: Suction portion

195: Discharge portion

Claims (5)

1. The claims defining the invention are as follows:

   Claim 1

   A water treatment apparatus for the water to be treated including sludge comprising:

   an inflow tank to which the water to be treated is led,

   an anaerobic treatment tank disposed at a downstream side of the inflow tank, the anaerobic

   treatment tank serves anaerobic treatment to the water to be treated,

   an aerobic treatment tank disposed at a downstream side of the anaerobic treatment tank, the

   aerobic treatment tank serves aerobic treatment to the water to be treated,

   a disinfection tank disposed at a downstream side of the aerobic treatment tank, the disinfection

   tank serves disinfection treatment to the water to be treated,

   a baffle portion disposed at the disinfection tank,

   a chemical cartridge disposed at a predetermined position in the disinfection tank, wherein the

   chemical cartridge houses the disinfectant for the water to be treated such that the disinfectant

   contacts with and dissolves to the water to be treated,

   a water to be treated transferring pump to transfer the water to be treated to the disinfection tank,

   wherein the water to be treated transferring pump discharges the water to be treated in a

   predetermined first direction,

   and the baffle portion changes the flowing direction of the water to be treated in a second

   direction different from the first direction to supply the water to be treated to the chemical

   cartridge.
2. Claim 2

   The water treatment apparatus according to claim 1, wherein the baffle portion is provided with

   a tank wall of the disinfection tank.
3. Claim 3

   The water treatment apparatus according to claim 1 or 2, wherein the flowing direction changing

   angle of the water to be treated by the baffle portion is arranged to be 90 degrees or more.
4. Claim 4

   The water treatment apparatus according to one of any claims 1 to 3, wherein a treated water

   tank is disposed at a downstream side of the aerobic treatment tank and at an upper stream side

   of the disinfection tank, and the water to be treated transferring pump is arranged to transfer the

   water to be treated in the treated water tank to the disinfection tank.
5. Claim 5

   The water treatment apparatus according to one of any claims 1 to 4, wherein the chemical

   cartridge is provided with a plurality of cartridge bodies in each of which a disinfectant is housed,

   and

   the water to be treated the flowing direction of which is changed by the baffle portion is

   sequentially transferred to the plurality of cartridge bodies.

   Fig. 1

   [図1］

   100 105 101 120 140 141 101a 160 150 151,151a

   101c 101d 103 A 105a A 110 106a 1/9

   170 102 191a 171

   104 104 101b 104 150 106 151

   Fig. 2 ［図2］

   104 104 104 101f 100 191a 170 102 171 108 103 WL 141 106a 192 2/9

   110 105a 151, 151a 191 107 160 101 153 105 101d

   101c 106 150

   151, 151b 120 152 101e 140

   Fig. 3

   191

   192 103 3/9

   102 140 150 160 170 110 120

   100

   ［図4］ 4/9 01 Sep 2022

   Fig. 4 2022224798

   170 180

   172

   171

   174 192