The examination of Tetraselmis suecica microalgae's capability on the purification of urban secondary wastewater

In this research, purgatory effects of Tetraselmis suecica microalgae were studied. The purpose of this study was the evaluation of this microalgae's capability at different concentrations in order to remove ammonia and phosphorus from wastewater. For this purpose T. suecica microalgae was cultured under controlled laboratory conditions at three initial densities(5×105, 1×106, 2×106 as low, moderate and high, respectively) in 250 cc of wastewater for 14 days. During the period of culturing, the concentration of phosphate, nitrite and nitrate was determined by standard method of measuring by using ultraviolet spectrophotometer. Low and moderate concentrations of this microalga showed the removal rate of 80%, 71.6% and 56.3% for nitrate, phosphate and nitrite respectively. These results show the capability of T. suecica for N and P removing from wastewater as well as the possibility of its use in order to purification of wastewater, so that higher densities show more satisfactory results in N and P removing.