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Abstract
Describes the reduction in the level of pollution in settled sewage by the natural process of algal-bacterial symbiosis in an open pond.The operating experience with a pilot plant at Fairfield Sewage Treatment Works of the Metropolitan Water Sewerage and Drainage Board is described. The results clearly showed that the same high rate of purification as obtained in similar units in the USA could be expected under local conditions in full scale plants. The widespread application of the process is limited by the problem of separating the algae produced from the treated water flowing from the continuously operating unit. Methods of separation are described and their cost and applicability discussed.