Development of clean, sustainable and renewable energy technologies is the key to overcome the problems such as greenhouse gas emissions and energy crises. Currently, cultivating microalgae has gained large momentum among researchers due to their photosynthetic rate of CO2 fixation and its versatile nature to grow in various wastewater systems. In addition, various options of exploring biofuels such as biodiesel, bio hydrogen and bioethanol etc., has made this technology most promising and viable one. However, the efficiency of wastewater treatment differs species to species. In this review paper the use of microalgae group Chlorophyta for various energy and environmental applications have been discussed. Further, the aspects such as applicability of Chlorophyta in industrial wastewater treatment, domestic wastewater treatment and nutrient removal are presented. In addition, the harvesting techniques, cultivation methods and other commercial applications have been discussed widely.
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