Article: Coupled nutrient removal from the wastewater and CO2 biofixation from the flue gas of iron and steel manufacturing Journal: International Journal of Global Warming (IJGW) 2018 Vol.16 No.2 pp.148 - 161 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. Inderscience Publishers - linking academia, business and industry through research

Title: Coupled nutrient removal from the wastewater and CO₂ biofixation from the flue gas of iron and steel manufacturing

Authors: Direniş Çaylı; Sibel Uludag-Demirer; Goksel N. Demirer

Addresses: Department of Earth System Science, Middle East Technical University, 06800, Ankara, Turkey ' Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, MI, 48824, USA ' Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, MI, 48824, USA; Department of Environmental Engineering, Middle East Technical University, 06800, Ankara, Turkey

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.

Keywords: microalgae; CO₂ biofixation; flue gas; coking unit; wastewater; iron-steel industry.

DOI: 10.1504/IJGW.2018.094554

International Journal of Global Warming, 2018 Vol.16 No.2, pp.148 - 161

Received: 08 May 2017
Accepted: 31 Dec 2017
Published online: 06 Sep 2018 *

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Title: Coupled nutrient removal from the wastewater and CO2 biofixation from the flue gas of iron and steel manufacturing

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Title: Coupled nutrient removal from the wastewater and CO₂ biofixation from the flue gas of iron and steel manufacturing