WHAT IS TURBIDITY?
Turbidity, cloudiness in water, can be interpreted as an absence of clarity or
brilliance. It is caused by suspended and colloidal matter such as clay, silt, organic
and inorganic matter and microscopic organisms. Turbidity should not be
confused with color since a darkly colored water can still be clear and not turbid.
Turbid water is often an indicator of conditions that could cause damage to
manufacturing equipment. Water clarity is especially important to the producers
of consumer products such as beverage producers, food processors and water
treatment plants. The particulates that cause turbidity may not always be harmful
to human health, but are considered an undesirable characteristic.
Turbidity in industrial water used for boiler and cooling systems should be as low
as possible. In boilers, the particles may become concentrated and settle out as a
sludge that will damage equipment and cause foaming. In cooling water systems,
particles can interfere with corrosion inhibitors. Water clarity is improved with
fluid-particle separation processes such as sedimentation, coagulation and
filtration.
In swimming pools, cloudy water is a common problem. The usual causes for poor
water clarity are corrosion, improper filtration and/or improperly balanced water.
An algae condition or severe chloramine condition can also cloud pool water.
In natural waters, turbidity is an indicator of quality and productivity and can be
used to monitor the health of streams and lakes. Turbid water may indicate runoff
from construction, agriculture or other types of pollution. Suspended sediment
can carry nutrients and pesticides throughout the water system. Suspended
particles near the surface absorb additional heat from
sunlight, raising the water temperature and blocking out
the light needed by submerged aquatic vegetation
and bottom dwelling creatures.
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