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Demand for the biofuel very exceeds the supply, so alternative sources of biomass are required. It refers to fuel produced from once-living organisms. Usually, it is used for running vehicles or supplying electrical power via a diesel generator. Much extensive research is conducted for the use of algae as a potential source of biodiesel because of the plentiful resources of Marine Microalgae Biomass in freshwater and other marine sources. In many countries throughout the world, the cultivation of algae or algaculture is carried out at large scale for the production of biodiesel. The important fuels synthesized from algae oil are biogas, biodiesel, bioethanol, biobutanol and dry algal fuel (similar to coal) such as the group algae aviation fuel has created.

As a source of renewable energy and dietary supplements, microalgae emerged as a promising source. In the last few decades, with a wide range of commercial applications algae have attracted a lot of attention of the researchers. However, microalgae utilization is not economically sustainable due to the high cost of harvesting. But many biotech firms are engaged in developing the cost-effective technique of Harvesting Microalgae with nonportable land and seawater. Harvesting of microalgae is an important part of the cultivation system to produce higher biomass. The purpose of harvesting is to obtain microalgae slurry. There are many techniques available, but coagulation and flocculation, centrifugation and filtration were found to be most suitable for considered applications.