Sasan Ghobadian - Department of Civil Engineering, Faculty of Civil Engineering and Architecture, Malayer University, Malayer, Iran
Neda Soltani - Department of Research and Development, Afaghzist Company
Maryam Ameri - Industrial Microorganisms Biotechnology Research Department, Industrial Biotechnology Institute, ACECR, Mashhad, Iran
Mehdi Bolfion - Department of Petroleum Microbiology, Research Institute of Applied Sciences, ACECR, Shahid Beheshti University, Tehran, Iran

The increasing need for water resources and other factors in reducing these resources, along with the health and environmental problems of wastewater, make it clear that our linear water economy must evolve into a resilient circular water economy, where water is continuously reused, and contaminants become the feedstocks for other economically valuable processes. Biofilters utilize biological living things as catalysts to harvest valuable components which is a critical emerging technique.Cyanobacteria and microalgae's ability to be mixotrophs provides a competitive advantage against bacteria and fungi to be used in biofilters. Due to the reduction of environmental nutrients, heavy metals, pathogens, oxygen production for aerobic organisms, and carbon dioxide consumption, microalgae play a prominent role in purification processes.In this research, the appropriate species were chosen by examining different types of algal species and immobilization methods to produce biofilters. The performance of the optimally produced biofilter to reduce the pollution indicators of the industrial effluent was investigated.The results show the appropriate performance of the biofilter produced with AFC۰۰۸ and AFC۱۱۰ species to perfect removal of nitrate and phosphate and ۷۶%  COD reduction and ۷۹% reduction of BOD in less than a week (along with aeration pretreatment).

Biofilter, Industrial wastewater, phycoremediation, Wastewater treatment, Algae