What is Dosing? in Pharmaceutical Purified water system

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 DOSING SYSTEM

In Pharmaceutical Process Water Generation system, Dosing is the process of addition of the external chemical components to
the water as a part of the process water treatment process. This is required to
achieve the aim; to have purified water.

There are three types of dosing system required After Micro
filtration and Before Reverse Osmosis. These are;

DOSING SYSTEM
Figure:01
Dosing System in Operation Flow of Process water system

ANTISCALANT DOSING

What
is Antiscalant?

Antiscalant are the chemicals.
This is used in the water treatment before the feed water enters to the process
of Reverse Osmosis. Antiscalant are a family of chemicals designed to prevent
the formation and precipitation of crystallized mineral salts that form
scale.

Calcium Carbonate, Calcium
Sulfate, Strontium sulfate, Barium sulfate is the most responsible mineral
scalants of concern. This scalants are responsible for the causing scaling and
should be targeted.

What is Scale?

This are the mineral components
those deposits on surface, as we are talking about the Process water system
wherein it is used before the Reverse Osmosis (RO) System,
scalants deposits on the RO membrane and impacts on the flow of the water and
reduce the flow rate.

What
is Requirement for usage of Antiscalant?

Antiscalant made of Polyacrylic
acid and are anionic in nature. Sodium hexametaphosphate is being commonly used
as Antiscalant. Antiscalant are
used for preventing the membranes from scaling.

What
is Effectiveness of usage of Antiscalant?

Antiscalant are very
effective in prevention of carbonate and sulphate scaling on membranes, Actually
it does not prevent scaling to occur; rather it delay the formation of large
crystals that form scales.

So that in simple words it
can be said that Antiscalant are being used for the prevention of RO membrane
in the next stage of Water purification, from the damage caused by the various
scalants.

SMBS
DOSING

What
is SMBS Dosing?

SMBS dosing is the dosing
of a chemical compound; named Sodium metabisulfate, This is used for the
process of De- chlorination of feed water.

Why
SMBS Dosing is required?

To remove the presence of
chlorine in feed water SMBS Dosing is required. This process helps to avoid
oxidation of RO membranes which is being used in the next stage of Water
purification.

Sodium Hypo-chloride is
used for the Chlorination of water as a part of disinfection process. When
Sodium Hypo-chloride dissolved in the water for dis-infection process of water
it gives free chlorine and water forms Hypo-chlorous Acid (HOCL) with the help
of free chlorine.

Chlorine remains in water
in active form, Active chlorine is corrosive in nature and damage the RO
Membranes. Hence, Removal of this chlorine is required to be removed from
water.

pH
DOSING

For maintenance of pH of
water Caustic Soda i.e. NaOH dosing is used in the water purification process
requirement at this stage is 9 to 10.

What
is purpose of pH Dosing?

CO2 content in water is
considered as an important content & parameter, as CO2 in gaseous form can
pass easily through RO membrane, Hence NaOH dosing is require which transform
CO2 as ion and easily eliminated by RO process.

    
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