الفهرس | Only 14 pages are availabe for public view |
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. |