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Usually algae is sensitive for removal of hazardous pollutants hence it is important to select fast growing and high resistant strains of algae Muñoz and Guieysse 2006 The biological treatment of wastewater with algae to remove nutrients such as nitrogen and phosphorus and to provide oxygen for aerobic bacteria was proposed over 50 years ago by Oswald and Gotaas 1957 Algae culture offers an elegant solution to tertiary treatments due to their ability to use inorganic nitrogen Oswald 1988b c Richmond 1986 In reported papers Lau et al 1996 studied the ability of Chlorella vulgaris in the removal of nutrients They found that the results indicated in a nutrient removal efficiency of 86 inorganic N In earlier study Colak and Kaya 1988 reported an elimination of nitrogen 50 2 in industrial wastewater treatment Mohamed 1994 pointed out that Scenedesmus sp is very common in all kinds of freshwater bodies which play an important role as primary producers and contributes to the purification of eutrophic waters The author indicated that the presence or absence of certain species of Scenedesmus can be used for the evaluation of water quality Abdel Raouf et al 2012 Palmer 1974 surveyed microalgal genera from a wide distribution of waste stabilization ponds In order of abundance and frequency of occurrence the algae found were Chlorella Ankistrodesmus Scenedesmus Euglena Chlamydomonas Oscillatoria Micractinium and Golenkinia
