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Saito Tank
Saito Tank realized compatibility between
gconsiderations to the global environmenth and gcost reduction.h
Saito TankReplacement of filter media is not necessary.
Maintenance cost can be dramatically reduced.
It contributes to achievement of zero emission, solution to environmental problems,
and response to ISO14000.

For filtration systems now used for small water systems or by private companies, filter media are replaced every six months to five years. Although these used filter media can be recycled if they are washed and rehabilitated, they are usually disposed of as industrial waste due to such problems as space for installing a washing system and costs for washing filter media. In this regard, we developed the gSaito Tank,h which is a filtration system that can produce filtered water of consistent quality without replacement of filter media. Since filter media are always kept clean, there is no need to dispose used filter media as industrial waste, an improvement from in the past. It serves as a stepping stone to a solution to environmental problems and achievement of zero emission advocated by ISO14000. It is also expected to significantly reduce maintenance costs, including the cost for replacement of filter media and the cost for backwashing.

Please reffer our "Saito Tank Introdction" movie next.Download
Characteristics
1)
Replacement of filter media is not necessary any more.
 
Since filter media in Saito Tank are always kept clean, there is no need at all to replace filter media, though a small amount of resanding is necessary.
2)
Since filter media are always kept clean, consistent water quality can be achieved.
 
Saito Tanks can keep filter media in as new condition. Therefore, consistent filtration is possible. In addition, since Saito Tanks have a structure that prevents unevenness of supporting gravel, so problems due to unevenness, including short pass do not occur. The amount of filter media flowing out due to sludge deposit is also reduced, and the capacity to capture suspended substances does not deteriorate.
3)
Maintenance cost is dramatically reduced.
 
gCost for filter media replacement work,h gcost for disposing of used filter media as industrial waste,h and gcost for purchasing new filter media for replacement workh are not necessary. Therefore, maintenance costs can be dramatically reduced.
4)
The amount of backwash water can be significantly reduced.
 
Since Saito Tanks exfoliate tightly adhering suspended substances by Saito Cleaning and conduct backwashing only for rinsing away the suspended substances, the amount of backwash water can be significantly reduced compared to conventional filtration systems.
5)
Saito Tanks serve as a large stepping stone to the achievement of zero emission.
 
Filter media can be used semi-permanently. Therefore, there is no need any more to dispose of used filter media as industrial waste. Saito Tanks are gearth-friendlyh filtration systems that significantly contribute as a solution to environmental problems and response to ISO14000.
6)
Water quality maintenance cost can be significantly reduced.
 
Suspended substances never pile up in filter media. The breakthrough of suspended substances due to longtime use and the fixation of filter media to each other due to organic matters, etc. can be prevented. Therefore, water quality is always kept consistent so that risks necessary to maintain water quality can be alleviated. As a result, costs for water quality analysis or analysis of the status of filter media can be significantly reduced.
7)
Fixation of filter media is prevented.
 
Since fixation of filter media is prevented, Saito Tanks can be used not only for water supply but also for sewage/wastewater treatment.
8)
Saito Tanks are perfect for use in the pretreatment of membrane process systems, membrane/activated carbon systems, soft water systems, and pure water systems.
 
By introducing the Saito Tank for pretreatment, burden on the subsequent system can be alleviated, so maintenance costs necessary for the entire system and maintenance work can be reduced.
9)
Maintenance of Saito Tanks is easy.
 
Cartridge-type screws are used for Saito Tanks, so maintenance of the tank is easy.
10)
SUS304 is used for the wetted part.
 
For the wetted part, SUS304 is used under the standard specifications. Since SS coated with epoxy tar, etc. is used for filtration systems in general, significant cost and time is necessary for curing. However, such mending of coating is not necessary for Saito Tanks.
 
Saito washing
The Introduction of Saito Cleaning to the filtration system
Saito Cleaning
Since the principle of Saito Cleaning was introduced to the filtration system and was systematized, filter media is always kept clean. Therefore, filter media replacement work is not necessary. Filter media is washed by Saito Cleaning, and backwashing is conducted only for rinsing, so maintenance costs, including the cost for backwash water, can be largely reduced.

The unevenness of supporting gravel is prevented by the unevenness preventing plate.
Principle of washing filter media
flow1
flow2 flow3
A vortex flow is generated by the gravity of particles and the lift force created by the screw. The filtration bed area is secured by the ribbon screw. Particles running outward due to the centrifugal force generate a vortex flow.
High cleaning effect
 
Backwashing and air-washing can only prevent clogging at best. However, by gSaito Cleaning,h even stubborn sludge can be removed because filter media wash each other with a kneading action. Therefore, filter media can be cleaned up to the degree of turbidity comparable to that of new sand (JWWA A-103).
Filter media cannot be crushed washing by "kneading methodh that has optimum cleaning effect.
 
Due to filter media washing each other using a kneading action, filter media will not be crushed while only sludge attached to the surface is removed. Therefore, filter media can be kept in the condition close to that of new filter media.
The outflow of exfoliated sludge can be avoided or significantly reduced.
 
Due to the vigorous cleaning effect, the outflow of exfoliated sludge into filtered water can be avoided or significantly reduced, and a constant and consistent water quality can be achieved.
The outflow of filter media is significantly reduced.
 
Filter media run off during backwashing has a low specific gravity, and extremely large amount of sludge and manganese are attached to it. The run off occurs regardless of particle sizes. Saito Tanks can significantly reduce the outflow of filter media by keeping filter media in the same condition as new filter media.
 
Flow of Saito Tank
1.Filtration
As with conventional filtration systems, filtration is conducted by downflow with pressure. Although the inner cylinder and the screw are placed at the center, filter media are also packed into this area. Filtration is thus conducted by the entire filtration system. A Saito Tank can treat the same amount of water as conventional filtration systems of the same size.
2.Backwashing
Backwashing is first conducted for a short period of time to fluidize filter media, and then Saito Cleaning is conducted.
3.Saito Cleaning
3.Saito Cleaning
Filter media wash each other using a kneading action caused by the upward force that pushes water and filter media up from the lower part to the upper part by the rotation of the screw and the downward force generated by gravity.
4.Backwashing
4.Backwashing
After Saito Cleaning, backwashing is conducted to drain away washing water. Sludge is completely exfoliated from filter media to which Saito Cleaning was applied, so sludge can be easily removed by rinsing.
*Since backwashing is conducted, dual filtration using anthracite is also possible.
 
Example Flow Sheet of a Saito Tank
Example Flow Sheet of a Saito Tank
 
Line up
Standard Specifications of Saito Tanks
Material @Body: rtrROS@/@Motor bearerElegs: rrSOO
Types Body diameter (mm) Cartridge diameter (mm) Motor (kW) Amount of treated water (LV=10)
rs|VOO
ӂVOO
ӂQOO
R.V
R.W3^g
rs|XOO
ӂXOO
U.R3^g
rs|POOO
ӂPOOO
ӂQTO
T.T
V.W3^g
rs|PQOO
ӂPQOO
PP.R3^g
rs|PTOO
ӂPTOO
ӂSOO
V.T
PV.U3^g
rs|PUOO
ӂPUOO
QO.O3^g
rs|PWOO
ӂPWOO
QT.S3^g
rs|QOOO
ӂQOOO
ӂTOO
PP.O
RP.S3^g
rs|QQOO
ӂQQOO
RV.X3^g
rs|QTOO
ӂQTOO
ӂVOO
PW.T
SX.O3^g
rs|QWOO
ӂQWOO
UP.T3^g

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