Bioremediation of two simulated media of salty- and fresh- water using Chlorella vulgaris and Scenedesmus sp.

BACKGROUND AND OBJECTIVESChlorella vulgaris and Scenedesmus sp. are two major microalgae which have been used for water and wastewater treatment in recent years. Dissolved ions such as NO۳, NO۲ and also toxic metal which make major problems for human life can be assimilated by them and meet the standard levels of treated water by microalgae growth. This study evaluates the reduction of total dissolved solids (TDS) along with biomass production in two simulated media of BBM and BG۱۱ to predict their ability in a salt- and freshwater treatment for industrial application.MATERIALS AND METHODSC. vulgaris and Scenedesmus sp. were obtained from Iranian Research Organization for Science and Technology (IROST) and cultivated in mono and mixed culture with similar inoculation cell number at room temperature for ۱۴ days in ۶ Erlenmeyer flasks (۵۰۰ml) of BG۱۱ and BBM medium under continues light condition with in intensity of ۱۰۰۰۰ lux irradiation. Counting the cell number of microalgae, pH, biomass production, optical density (OD۶۸۰) and TDS and electrical conductivity were measured every day.RESULTS AND DISCUSSIONAccording to the results, mono cultivation of C.vulgaris and mixed cultivation of two microalgae in BBM have reduced TDS and EC rather than other cultivations. Moreover, the biomass production and optical density as well as pH have increased during ۱۴ days when growing microalgae and assimilation of dissolved iones. It means that C. vulgaris as mono and mixed cultivation has ability to be applied for TDS removal in salty water medium.CONCLUSIONThe results revealed that both microalgae species can be effective for TDS removal. In general, C. vulgaris has shown higher removal efficiency in most parameters in both medium cultures (BBM and BG۱۱) than Scenedesmus as mono and mixed cultivation.

کلیدواژه ها:

Microalgae ، TDS ، BBM ، BG۱۱ ، Salty and fresh water