MEDIA FILTERS

MARS IRON REMOVERS - VENUS CHLORINE REMOVERS - SAND QUARTZITE FILTERS - VEGA ARSENIC REMOVERS

ACCESSORIES ON DEMAND

MARS - VENUS - SAND

The water used for drinking, sanitary or technological applications supplied by the water system

or an autonomous source can have various problems such as:

- impurities (sand, clay, silt)

- iron and manganese

- excess of chlorine or bad smells and tastes

- In the first case, in order to protect the water system (valves, pressure switches, taps, boilers,

etc.) it is necessary to place a filter at the system supply inlet to stop all impurities. If the water

contains only sand or small quantities of foreign bodies, normal filter cartridges are used; if clay,

silt and/or colloidal substances are present in the water, multi-layer, different size quartz sand

filters are used, capable of stopping big quantities of impurities. The SAND clarification filters

by ATLAS FILTRI consist of a column containing a permanent multi-layer filtering bed; to get rid

of the impurities and restore the filter efficiency, just carry out counter-current rinsing at regular

intervals. This is done automatically by the controlling head, controlled by an electronic

displacement timer/control.

- In the second case iron and manganese must be eliminated because their presence gives

water a yellow-reddish colour and an unpleasant taste, causes deposits leading to blockages

and often system corrosion. In domestic use the iron in the water can also stain bathroom

fittings, taps and linen, with aesthetic and hygienic problems. Drinking water must not contain

more than 0.2mg/l of iron or 0.05 mg/l of manganese. MARS deferrizing filters by ATLAS FILTRI

consist of a column containing a manganese dioxide (pyrolusite) filtering bed acting as a catalyst

for the oxidation of the iron, manganese and hydrogen sulphide present in the water. To ensure

the filter is effective, carry out counter-current rinsing of the filtering bed at regular intervals. In

this case too this is done automatically by the controlling head, controlled by an electronic

displacement timer/control.

- In the third case, a filter must be installed at the water supply inlet using charcoal filters. The

VENUS dechlorination filters by ATLAS FILTRI consist of a column containing a filtering bed of

selected vegetable granular charcoal, with a high internal surface and optimum porous

structure to absorb the organic compounds present in the water for civil or industrial use. To

ensure the filter is effective, carry out counter-current rinsing of the filtering bed at regular

intervals. As with the other models, this is done automatically by the head, controlled by an

electronic displacement timer/control. In drinking water systems a disinfection (UV or chlorine

dosing) system must be installed downstream from the dechlorination filter.

VEGA

The average content of arsenic found in the rocks of the earth’s crust is about 1.5 ppm, which

corresponds to 1.5g of arsenic per ton of rock. In the food chain and water for human

consumption, arsenic is extracted from rocks, soil and water.

Small doses of arsenic are considered a vital element for man, but higher doses have very serious

effects.

The European Community has recognized the problems connected with this element and has

consequently reduced the limit value for water for human consumption to 10 μg/l.

Arsenic can be divided into As5+ (forming compounds called arsenates) and As3+ (forming

compounds called arsenites).

All treatment processes for extracting arsenic from water for human consumption usually extract

As5+ better than As3+.

Consequently the oxidizing of As3+ (in comparison with As5+) with substances such as

hypochlorite, potassium permanganate and ozone is often required.

At the moment the separation of arsenic from drinking water with granulated ferric hydroxide

(GFH) is a very advantageous process thanks to low investment and maintenance costs.

In removing arsenic from water, both As3+ and As5+ compounds are absorbed by the GFH in a

specially constructed filter the water to be treated runs through. Even during very long running

periods, the filtering material maintains good porosity and good capacity of holding arsenic.

Good porosity is due to the fact that the grain size is very homogeneous between 0.2 and 2 mm.

The high capacity of absorbing arsenic is due to the fact that GFH is produced so that it has low

crystallinity and high microporosity.

The VEGA arsenic removing filters by ATLAS FILTRI can be used to treat all or just part of the water

for human consumption.

The problem of whether to treat all or just part of the water for human consumption with

subsequent mixing depends on the maximum level of arsenic required, but above all from the

expected peak consumption.

The typical behaviour of a GFH arsenic removal system shows that the content of arsenic in the

water treated with the above filters slowly and predictably increases with time. This means there

is no sudden ‘death’ of the absorbing power typical of other filtering substances.

324 | water treatment systems

chlorine test drops

iron test drops

arsenic test drops

CODE RE8000012

CODERE8000010

CODE RE8000013

manual by-pass for 263/268 valve CODE EA1015037

manual by-pass for 255 valve CODE EA1015038

OPERATING MODES

- TIME (ATL): regeneration valve with electronic

timer automatically starting the regeneration at

a time programmed by the user (for domestic use

normally at night, when the demand for softened

water is minimal). The unit allows programming

of the time and frequency of the regeneration,

from a minimum of 1 regeneration every 12

hours to a maximum of 1 every 99 days.

Alternatively, the regeneration can be

programmed for a fixed day in the week, always

at the same time.

- VOLUME (AVL): regeneration valve fitted with a

flow sensor and a turbine meter checking the

volume of the water treated. This version starts

the regeneration at the selected time of the day

chosen by the electronics according to the real

water consumption, the exchange capacity and

the set hardness. The unit allows programming

in the following modes:

• time-volume: after reaching the set volume, at

a set time.

• pure volume: immediately after reaching the

set volume.

CERTIFICATIONS

The products are tested and certified under the most stringent

procedures worldwide, in compliance with DM 25 (Italy) and

with the sanitary certification EAC (Russia).

SYMBOLS LEGEND

For domestic use

For technical and

industrial use