Abstract
Brazil, a country with high biodiversity and water availability, has severe difficulties in the management of environmental sanitation. Aiming to promote the treatment of residual water and the reduction of eutrophication in water bodies, there is development of biotechnologies that use microalgae for the removal or biotransformation of pollutants. The objective of this work was to develop a prototype for urban wastewater treatment using a microalgae species (Chlorella vulgaris) to remove the main pollutants: nitrogen and phosphorus found in the chosen urban river (Camarajipe River, Salvador-BA), with a view to production of bio-products (biofuels, biofertilizers, bioplastics). The proposed area is in the low course of the Camarajipe river. Physicochemical parameters were monitored by means of a multiparameter probe. Chlorophyll and dissolved ion analysis were performed throughout the monitoring. After 15 days, it was evidenced the total removal of ammoniacal nitrogen and nitrate in all the gradients of planned treatments, besides the removal of phosphate in up to 75% present in the water. The highest growth of algal biomass was 601.1 μg / L, precisely in the planned treatment with 100% urban waste water. Finally, the results showed that the prototype developed using the C. vulgaris species was efficient in the treatment of surface waters from an urban river contaminated with excess organic matter.
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