Using bio-absorbents for treating industrial and domestic wastewater research have been recently increased. The dual application of microalgae for wastewater treatment and biomass production is a feasible way to reduce environmental problem. In this regard, the use of local microalgae in free and immobilized forms in native and diluted industrial wastewater was investigated. Immobilization was studied in alginate matrix, together with barium or calcium chloride cross link agents with other polymers and salts (chitosan, methyl cellulose, PVP, and CaCO3). Algae in both forms showed capability of absorption of nutrients and metal ions according to ICP and COD measurement. The results showed that using the immobilized form is superior due to the ease of harvest and possibility of alginate in metal ions’ chelation in a short time in comparison with free form.

Keywords: alginate, free and immobilized microalgae, phycoremediation, wastewater

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