Anette åkerstrøm algalbioremediation15_11_12

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Algal Bioremediation of a high strength wastewater - Growth, Nutrient removal and Biomass production, Anette Åkerstrøm (UMB, Norway)

Algal Bioremediation of a high strength wastewater - Growth, Nutrient removal and Biomass production, Anette Åkerstrøm (UMB, Norway)

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  • 1. Algal bioremediation of a high strengthwastewater-Growth, Nutrient removal and Biomass production Anette Åkerström
  • 2. NORWEGIAN UNIVERSITY OF LIFE SCIENCESand biomass productionAlgal bioremediation of a high strength wastewater-Growth, Nutrient removal This Research:  Part of a collaboration project A Sustainable Process to Capture and Store CO2 to Increase Production of Renewable Bioenergy, owned by Biowater technology AS and sponsored by The Research Council of Norway (BILAT).  Integrating algae cultivation system into wastewater treatment plants. www.umb.no 3
  • 3. 4 sludge liquor N/P rich Low N/P Anaerobic effluent digestion Energy www.umb.no CO2 production Algae SludgeAlgal bioremediation of a high strength wastewater-Growth, Nutrient removal and biomass productionNORWEGIAN UNIVERSITY OF LIFE SCIENCES
  • 4. NORWEGIAN UNIVERSITY OF LIFE SCIENCESand biomass productionAlgal bioremediation of a high strength wastewater-Growth, Nutrient removal Can algae grow in such turbid wastewater?  Sludge liquor has low light transmission that reduces photosynthesis.  High N:P ratio that can lead to P limitation.  High pH and ammonium concentration that can lead to ammonia toxicity. Sludge liquor Total Nitrogen (mg/L) 1210 Total Phosphorus (mg/L) 28 Total suspended solids (mg/L) 1590 COD (mg/L) 3700 Sludge liquor Light transmission (670 nm, 1 cm light path) 2.8 % www.umb.no 5
  • 5. NORWEGIAN UNIVERSITY OF LIFE SCIENCESGrowth, Nutrient removal and biomass productionAlgal bioremediation of a high strength wastewater- Growth of Chlorella sp. was tested in batch cultures with sludge liquor concentration from 100, 70, 50, 40, 25 and 12 %. Nutrient reduction in the supernatant and the chemical composition of the algae biomass. Concentration of % Light Total Phosphorus sludge liquor (%) transmission (mg/L) 12 85 4 25 71 8 40 20 11 50 15 14 70 8 19 100 2.8 28 www.umb.no
  • 6. NORWEGIAN UNIVERSITY OF LIFE SCIENCESGrowth, Nutrient removal and biomass productionAlgal bioremediation of a high strength wastewater- Growth rate of the batch cultures from the start of the experiment and to day 5,6, 7 and 8. 0 ,9 5 t2= 5 t2= 6 0 ,9 0 t2= 7 t2= 8 0 ,8 5 G ro w th ra te D a y -1 0 ,8 0 0 ,7 5 Algae can grow in pure sludge liquor but the 0 ,7 0 growth rate can be increased by increasing 0 ,6 5 the light transmission by dilution. 0 ,6 0 P-limitation Light limitation 0 ,5 5 12 25 40 50 70 100 C o n c e n tra tio n o f s lu d g e liq u o r (% ) www.umb.no
  • 7. NORWEGIAN UNIVERSITY OF LIFE SCIENCESGrowth, Nutrient removal and biomass productionAlgal bioremediation of a high strength wastewater- Equal nitrogen and phosphorus removal in 40 % and 100 % concentration of sludge liquor. The cellular N and P content is increasing with concentration of N and P in the medium. Increasing the light transmission from 2.8 % to 20 % resulted in a doubling in biomass production. 40 % 100 % Nitrogen removal % 36 32 Phosphorus removal % 94 89 Cellular N Content % 7 9 Cellular P Content % 0,5 1,5 Biomass g/L *Day 0,6 0,3 Biomass g/L 2,11 1,3 www.umb.no 8
  • 8. NORWEGIAN UNIVERSITY OF LIFE SCIENCESGrowth, Nutrient removal and biomass productionAlgal bioremediation of a high strength wastewater- Other objectives  Productivity, Nutrient removal and uptake of N and P in natural light and 3 temperature treatments.  The synergistic effects of CO2, Temperature and Irradiance. Laboratory studies. www.umb.no 9
  • 9. NORWEGIAN UNIVERSITY OF LIFE SCIENCESGrowth, Nutrient removal and biomass productionAlgal bioremediation of a high strength wastewater- Acknowledgements  Thanks to BioWater AS, Silje Roksti (our algae technicians) and Trina Halfhide (Fulbright scholar and algaeneer).  Thank you for your attention! www.umb.no 10