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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/573

Title: Biological removal of algae in an integrated pond system
Authors: Meiring, PGJ
Oellermann, RA
Keywords: Algae immobilization
Algae removal
Anaerobic pond-reactor
Autotrophic
Bio-flocculation
Facultative
Heterotrophic
Oxidation ponds
Petro process
Trickling filters
Issue Date: 1995
Publisher: Pergamon-Elsevier Science Ltd
Citation: Meiring, PGJ and Oellermann, RA. 1995. Biological removal of algae in an integrated pond system. Water Science and Technology, vol. 31(12), pp 21-31
Abstract: A system of oxidation ponds in series with a biological trickling filter is described. It was known that this arrangement was incapable of reducing effectively the levels of algae present in the pond liquid even though nitrification was effected because of autotrophic conditions prevailing in the trickling filters. This very low tropic level explained the lack of adsorptive capacity present. By short-circuiting less than 10 percent of the effluent from a fully loaded primary facultative oxidation pond to the trickling filter, the autotrophic nature or the film in the trickling filter was sufficiently shifted towards a heterotrophic state that had sufficient adsorptive capacity to retain the majority of the algae. It is concluded that the algae, although being absorbed, stay alive on the film and do not contribute significantly to the carbonaceous load on the trickling filter. Further more the algae, although secluded from all sunlight, actually partake in the purification process, producing an effluent which, unlike a normal humus tank effluent, is surprisingly sparkling clear. This significant observation appears to be in line with laboratory findings by others who, when they artificially immobilised certain species of algae and passed water over them, concluded that the algae retained the potential to remove certain compounds from the water. Conglomerates of biologically flocculated dark-green algae are scoured off the film (or sloughed off as part of the film) and having been photosynthetically inactive for some days, tend not to neat, but settle very rapidly. A very significantly aspect of this development is the great potential it has for practical application in developing countries. The algae sloughed off the media are easily thickened and available for ultimate recovery from the water phase without the addition of chemicals.
Description: Copyright: 1995 Pergamon-Elsevier Science Ltd
URI: http://hdl.handle.net/10204/573
ISSN: 0273-1223
Appears in Collections:Pollution and waste
Water resources and human health
General science, engineering & technology

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