Marine Microalgae Tetraselmis Suecica as Flocculant Agent of Bio-flocculation Method

Microalgae harvesting is an important part in microalgae cultivation system. Techniques for harvesting marine microalgae which are commonly used are centrifugation, filtration and flocculation. These techniques still have some disadvantages, such as not environment friendly, and high usage of energy and cost. Bio-flocculation harvesting technique using microalgae as a flocculant agent can be an alternative way to solve these problems. In this research, mixing of  Tetraselmis suecica  (flocculant) with  Chlorella sp. and  Nannochloropsis  sp. (non-flocculant) in ratios of 1:4, 2:4, 3:4 and 4:4 (v/v) has been conducted to obtain percent recovery of marine microalgae harvest. The results showed that  T. suecica  as flocculant agent can fasten the harvesting of  Chlorella  sp. and  Nannochloropsis  sp. It was shown by the increase of percent recovery value of  Chlorella sp. from 51.14 ± 1.07% to 67.34 ± 0.67% and  Nannochloropsis  sp. from 20.52 ± 1.17% to 42.43 ± 0.40% during the first hour of flocculating process. Our result showed that bio-flocculation is an environment friendly technique which can be applied to harvest marine microalgae.