What is Dosing? in Pharmaceutical Purified water system

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;

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.

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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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