Wastewater treatment by activated algae-pond system
1997
Ng, W.J. | Aziz, M.A.(National University of Singapore, Kent Ridge Crescent (Singapore))
Wastewaters from pig farms, palm oil mills and textile dyehouses along with domestic sewage are the major sources of water pollution in the region. Many biotechnological processes have been tried for the treatment of these wastewaters but none are potentially as efficient and economical as could be the activated-algae system. While the algal pond is primarily targetted for the removal of nutrients and polishing of effluents, the activated-algae pond with its mixed population of algae and bacteria is intended for the treatment of more concept wastewaters. The feasibility of using an activated-algae pond system to treat both domestic sewage and industrial wastewaters from pig farm, palm oil mill and textile dyehouse was investigated. A mixed culture of algae and bacteria was used in this investigation. The algae culture of common local species consisted predominantly of Chlorella Pyrenoidosa. The algae grew well in the culturing tank under various environmental conditions of pH, temperature, light and darkness. With a detention period of 15 days, the activated-algae bond system was able to remove 80-90 percent of BOD, 70-87 percent of COD, 60-73 percent of nitrogen, 55 to 70 percent of phosphorus and 80-90 percent of colour. Removal rates of organics, nutrients and colour correlated significantly with loading rates. The activated-algae pond system was, therefore, found feasible for treating both domestic sewage industrial wastewaters.
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