Water Quality Standards

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22 Φεβ 2014 (πριν από 3 χρόνια και 8 μήνες)

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Safe Drinking Water Act(Public Law 93
-
523).
Under this law, the primary responsibility of settling
the water quality regulations was moved from the
states to the EPA.


Water Quality Standards


Maximum Contaminant Levels


is the enforceable standard and is based not only on
health and risk assessment information, but also on costs and
the availability of technology. The MCLGs are based solely on
health and risk assessment information.

Overview of Water Treatment
Processes


Unit processes used for the treatment of surface water and
brackish waters summarizes the unit processes associated
with significant removal
cf

particular water constituents.


Treatment of surface waters mostly requires the removal of
particulate water and pathogens. Removing particles also
assists in pathogen removal, because most pathogens either
are particles or are associated with particles.

Coagulation and Flocculation


Most common method used to remove particles and a
portion of dissolved organic matter is a combination of
coagulation and flocculation followed by sedimentation
and/or filtration.


Coagulation is a charge neutralization step that involves the
conditioning of the suspended, colloidal, and dissolved
matter by adding coagulants.


Flocculation involves
the aggregation
of destabilized particles
and formation of larger particles known as
floc
.