Nada Elgiddawy, Tamer M. Essam, W.M.A. El Rouby, Mai Raslan and A.A. Farghali
Department of Biotechnology and Life Science, Faculty of Postgraduate Studies for Advanced Sciences, Beni Seuif University, Beni Seuif, Egypt
Many researchers consider cost-efficient harvesting of microalgae is the major challenge for both wastewater treatment and large scale production of microalgae. In this research, we present a novel approach for the recovery of Chlorella vulgaris microalgae biomass using Zinc Aluminum-layered double hydroxides (ZnAl-LDH) nanoparticles as a new green “eco-friendly” and efficient flocculant. The adsorption and agglomeration of microalgae cells onto LDH layers was elucidated, as well as, different factors affecting flocculation efficiency including LDH concentration, algae concentration, pH, temperature and time, were studied and then optimized by statistical analysis using Plackett Burman design. The best flocculation efficiency (96%) at sedimentation rate of 1-2 minutes.