Water treatment process

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Water treatment process

This diagram illustrates each stage in our treatment processes to treat both river and borehole water.

 

 

RIVER AQUIFER
SCREENING
Leaves and large debris removed
AERATION
Water from aquifers contains dissolved carbon dioxide (CO2) and to remove it we blow air through the water. If we leave the CO2 in the water we will use more lime at the later softening stage.

Aeration also converts soluble salts of iron and manganese, that occur naturally in the water, into insoluble precipitates which are subsequently removed.
CHLORINATION
Chlorine is added to purify the water
CHLORINATION
Chlorine is added to purify the water
CLARIFICATION
Fine particles are removed by adding coagulants, that cause the particles to stick together to form large lumps, called floc, which settle out of the water.
SOFTENING
The water then moves to the softening tank. Lime, fine sand or a coagulant are added. The lime reacts with the bicarbonates, which cause the hardness, to form chalk.

The chalk is either deposited on the fine grains of sand to form pellets, or the particles of chalk coagulate into a sludge, both will settle on the bottom of the tank.

The softened water leaves the top of the softening tank to the next stage.
FILTRATION
The water passes through gravity filters containing sand which remove any fine particles which have not settled.

Carbon Pressure filters containing 'Granular Activated Carbon' remove taste, smell and very fine particle
FILTRATION
The water passes through gravity filters containing sand which remove any fine particles which have not settled.

Carbon Pressure filters containing 'Granular Activated Carbon' remove taste, smell and very fine particle

 


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