Abstract
A pilot plant integrated ponding system was constructed with basic objectives of treating municipal wastewater and producing reusable algae. Raw sewage was allowed to pass through an oil and sand trap and then enter directly into facultative ponds in which organic loading was considerably reduced by mostly anaerobic processes. The effluent from the facultative ponds was then introduced into high rate ponds where high concentrations of photosynthetic algae were produced and further removal of organic matter and coliform bacteria took place. The algae was finally removed by sand filtration. The pilot plant basically consists of two facultative ponds each having a surface are of 100 m 2 and two high rate ponds each having a surface area of 44 m 2. The depth of water in the ponds can be varied. Several experiments were made with different depths of flow and detention times. Removal of biochemical oxygen demand, chemical oxygen demand, suspended solids, nutrients and coliform bacteria; and, soil conditioning and fertilizer effect of the algae produced were investigated. Results obtained indicate significant reduction in pollution concentrations. Preliminary investigations showed that irrigation with the pilot plant effluent increased crop yield.
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