16
Corrosex:
a highly magnesium oxide salt and is used most effectively where the pH
correction is substantial or the flow rate is high. In reality for a pH of less than 6 a 25%
Corrosex, 75% Juraperle mix is ideal.
Sediment filters:
Sand, Filter Ag & Turbidex
Vessel size
C1054
C1248
C1354
C1465
C1665
C1865
C2160
C2469
C3072
C3672
Service flow rate - m3/hr
0.6
0.9
1.0
1.2
1.6
2.0
2.7
3.6
5.6
8.0
Backwash flow rate - m3/hr
1.1
1.8
2.0
2.3
3.4
3.9
5.7
6.8
11.4
17.1
Sediment filters are needed when the water supply is cloudy or turbid. The particles in the
water will block plumbing systems, leave unsightly staining, may contain toxic chemicals or
bacteria. The easiest way to remove the particles is by passing the water through a media
where the particles get stuck and allowing clear water to flow through. The particles can be
periodically ‘backwashed’ away to drain.
Sand:
The grade of sand is tightly controlled so only highest quality; triple washed 0.5 to
1mm size water treatment grade sand is used. Particles above 40 micron are typically
trapped.
Filter Ag:
Has a high surface area and complex flow path for a more efficient removal of
suspended matter. Filter Ag is also lighter in weight than sand which reduces backwash flow
rate. Particles down to 20 micron can be trapped. Filter Ag should be soaked for 24 hours
before use.
Turbidex
Vessel size
C844
C1054
C1248
C1354
C1465
C1665
C1865
C2160
C2469
C3072
Service flow rate - m3/hr
0.9
1.5
2.19
2.50
2.9
3.8
4.8
6.6
8.6
13
Backwash flow rate m3/hr
1.2
1.9
2.7
3.1
3.6
4.8
5.7
8.2
10.7
17.4
Turbidex:
A natural ore that has a more irregular surface than sand. Giving more efficient
removal of suspended matter and means the equipment can be smaller. Particles down to 5
micron are typically removed. Turbidex has a different commissioning process!
Arsenic Removal Media
Vessel size
C1054
C1248
C1354
C1465
C1665
C1865
C2160
C2469
C3072
C3672
Service flow rate - m3/hr
1.1
1.5
1.8
2.0
2.6
3.2
4.5
5.9
9.2
13.5
Backwash flow rate m3/hr
1.3
1.9
2.2
2.4
3.3
4.2
5.6
7.3
11.5
16.5
Severn Trent worked to develop an arsenic removal media formulated to give a high arsenic
removal capacity. The media is strong, reliable and easy to handle. Arsenic is trapped within
the media and held even when it is backwashed. Typical life time of the media depends on
arsenic levels and the amount of water used. A 1054 system with 1 bag of media (15 Kg) can
typically be expected to treat 1500m3 of water at 50ug/l Arsenic .For a family of 4 the media
should last about 6 years.
Pre-treatment may be necessary as the raw water must contain: Iron <200ug/l, Manganese:
<50ug/l, Silica (SiO
2
) <40mg/l, Phosphate: <200ug/l, pH: 6.5 to 8.5, suspended
solids:<10mg/l.
Backwash frequency 14-28 days.
Summary of Contents for Water Specialist CI WS1
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