الفهرس 
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Abstract
A major limitation of oxidation ponds is the presence
of occasionally large quantities of algae in the effluent
which may add significantly to the organic load and
suspended solids of the receiving stream.
This study aims to the control of algal growth by
in-pond precipitation of soluble phosphorus which is a
major element required for algae nutrition.
A wide range of alum doses was tested. It was noted
that at the naturally high pH of the pond,
a large alum
dose (over 200 mg/l ) was required to achieve 50% algae
removal. By lowering the pH value to between 6.0 and 8.0,
an economical alum dose of just 50 mg/l was needed to
achieve the same result.