The Absorption of Nitrate and Phosphate from Urban Sewage by Blue-Green Algae (Spirolina Platensis) (An Alternative Medium) as Application for Removing the Pollution

摘要

The applications of blue green algae for the treatment of urban and industrialsewage have received more attention during the recent years because they have the capacity touse nitrogenous compounds, ammonia and phosphates. In this study aimed to evaluate theability of Spirolina Platensis for absorption of nitrate and phosphate from urban sewage. Theexperiment was conducted in 6 treatments as a growth medium. To test these predictions, weconducted a 15 days in indoor place under similar laboratory conditions at temperature (30ºC ±2ºC), Light (2500 ± 500) Lux, pH between 8.0 and 11and with constant aeration. Regarding theculture media, a higher algal density was observed in the cultivation developed at treatment 5(824 ±102 cell. mL-1). In our results showed higher efficiencies of phosphorus removal by S.platensis as compare to nitrate removal thus, S. platensis would be effective for nitrate removalonly at relatively low concentrations and phosphorus removal at high concentrations.Chlorophyll-a, content in treatment 3 was higher than other treatments. Kruscal-Wallis testshowed a significant difference in treatments at the level of P