**8. Conclusion**

Algae are considered as a third generation biofuel, having high oil content than terrestrial crops. In the present scenario, biorefinery approach of microalgae is a promising approach towards reducing the cost of operation of decontamination as well as fuel production. Algae can easily grow on wastewater, which further preserving the resources (arable land and fresh water) for other purposes. In spite of

producing various value added products from harvested algae biomass, it can act as a potential agent for wastewater remediation. Microalgae biomass production after wastewater remediation, could be a suitable fertilizer option. The microalgae biomass production reduces the organic load, and TDS, in wastewater which may further utilized as ferti-irrigation, hence reduces the burden on utilization of fresh water in a green circular economy. In addition, production of microalgae biochar which is rich in organic carbon, further enhances carbon sequestration and improving the soil quality and productivity. In this way, algae mediated wastewater treatment integrated with biochar, biodiesel and biofertilizer production from algae biomass is a recycling and resource conservation practice.
