Coupled nutrient removal from the wastewater and CO₂ biofixation from the flue gas of iron and steel manufacturing
by Direniş Çaylı; Sibel Uludag-Demirer; Goksel N. Demirer
International Journal of Global Warming (IJGW), Vol. 16, No. 2, 2018

Abstract: CO₂ mitigation through photosynthesis has attracted attention as an alternative strategy over chemical methods because it is less costly and energy-consuming. When the microalgae are fed with wastewaters containing high nitrogen and phosphorus, they remove nitrogen and phosphorus from the wastewater. Moreover, the harvested biomass from microalgal reactors constitutes a raw material for the production of different high-value chemicals and bio-fuels. This study investigated the coupled removal of CO₂ from the flue gas and nutrients (nitrogen and phosphorus) in the wastewater originating from the coking unit of iron-steel industry by using microalgal photobioreactors. The results indicated that the flue gas from coking unit of a typical iron and steel factory and the wastewater from the same process supported the microalgal growth. Photobioreactors achieved CO₂ fixation rates of 11.45-13.52 mg/L day. Notable nutrient (up to 77% total ammonia nitrogen (TAN) and 61% PO₄) and heavy metal (72% Cr, 63% Fe, 22% Cu and over 90% Cd) removals were observed in the coking process wastewater which was used to grow microalgal cultures.

Online publication date: Thu, 06-Sep-2018

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