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Hitachi

Water Environment Solutions

Overview

Wiseflow Screen is a fine mesh screen with large capacity and a wide range of applications.
The screen is useful for removing foreign substances affecting each process in water intake and sewage water treatment.

Configuration

The filtering area is composed of many plates that are equally spaced as a type of bar screen.
The screen is mounted on a conveyer chain in an endless configuration.
This screen moves continuously in and out of the water.

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Features

  1. Assured removal of small debris
    Flexibility in mesh size design, anywhere from 2mm to 12mm (standard mesh size is 2.5mm and 5.0mm).
    Long thin debris does not become tangled on the screen thanks to the nature of the parallel plate structure.
  2. Large screen area and high aperture ratio
    Continuous movement of the screen ensures that a fresh screen area is continuously exposed to incoming water.
  3. Combination with discharge unit
    Due to the external screen drive structure, the discharge unit can be easily installed on the inside of the screen.
  4. High durability and long life
    Durability and long life are due to high anticorrosion characteristics of the materials (stainless steel or synthetic resin for wet parts).
  5. Easy maintenance
    The drive unit is installed outside of the water.
    Simple unit structure

(In-house comparison)

Application

  • Prevention of scum in the final sedimentation tank
  • Foreign substances removal from scum
  • Foreign substances removal from sludge
  • Small sewage water treatment plant
  • Advanced treatment facility for sewage water treatment plant
  • Water intake facility for water treatment plant

Lineup

Wiseflow Screen
  • Intake channel type
  • Unit type
    • For sewage water, scum
    • For sludge

Example of application - intake channel type

intake channel type
Model WF645 WF660 WF960 WF990 WF1290 WF1212 WF1512 WF1515
Channel width
(mm)
Around 1,200 Around 1,800 Around 2,400 Around 3,000
Channel depth
(mm)
- 6,500 - 6,650 - 6,800 - 6,950
Inlet width
(mm)
400 700 1,000 1,300
Screen width
(mm)
350 500 500 800 800 1,100 1,100 1,400
Mesh size
(mm)
2.5 or 5.0
Cleaning water
[l/min]
150 200 200 300 300 400 400 500
Dimensions
(mm)
W 600 900 1,200 1,500
L 450 600 600 900 900 1,200 1,200 1,500
H - 8,250 - 8,550 - 8,850 - 9,150

Note

*1
Capacity differs according to design conditions (raw water quality, mesh size, allowable head loss).
For a particular requirement, consult with Hitachi.
*2
Clean water of more than 0.3 MPa is required for washing.
*3
Dimensions are approximate.
*4
All specifications are subject to change without notice.

Example of application - unit type

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unit type
Model WFP5 WFS25 WFS40 WFS65
Use application Sewage water, scum Sludge
Mesh size
(mm)
2.5 6
Capacity *1
[m³/min]
5 0.5 - 2.5 - 4.0 - 6.5
Motor power
[kW]
Screen 0.2 0.2 0.4 0.75
Conveyer 0.4 0.75 1.5 2.2
Cleaning water *2
[l/min]
150 200 200 300
Dimensions
(mm)
W 1,150 1,450 1,450 2,050
L 2,300 2,250 2,400 3,000
H 1,700 1,900 1,900 2,500

Note

*1
Conditions for the indicated capacity are:
Model WFP: SS 400mg/l
Model WFS: 1.0% sludge content and 500 mg/l foreign substances content
*2
Clean water of more than 0.3 MPa is required for washing.
*3
All specifications are subject to change without notice.

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