Page 21 - Water Every Drop Counts

AQUA PURA : WHAT IT TAKES

Most water requires some
type of treatment before use,
even water from deep wells or
springs. Water purification is the
process of removing undesirable
chemicals, materials, and biological
contaminants from contaminated
water. The extent of treatment
depends on the source of the
water and status of impurities that
are unacceptable from applicable
standards.
COAGULATION A typical water plant in your city will
comprise of following sequential
steps:
Coagulation and Flocculation:
Flocculation is a process for
clarifying the water by removing any
turbidity or color so that the water
is clear and colorless. Clarification
is done by causing a precipitate
to form in the water which can be
removed using simple mechanical
methods. Alum is commonly used
as a coagulation agent.
Sedimentation: Sedimentation
SEDIMENTATION
is the tendency to settle out of the
fluid in which they are suspended
particles have entrained, and
come to rest against a barrier.
During this stage water purification
flocculate is allowed to settle down
in sedimentation tank and water
moves on to the filtration stage.
FILTRATION
Filtration: After separating most
floc, the water is filtered to remove
remaining suspended particles and
unsettled floc.
Disinfection : Water is disinfected
to kill pathogens which are able to
pass through the filters. Disinfection
is accomplished by adding
STORAGE disinfectant chemicals in this+
last step of the water purification
process. The most common
DISINFECTION
disinfection method involves some
form of chlorine.

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