Anette åkerstrøm algalbioremediation15_11_12
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N O R W E G I A N U N I V E R S I T Y O F L I F E S C I E N C E S www.umb.no
description
Algal Bioremediation of a high strength wastewater - Growth, Nutrient removal and Biomass production, Anette Åkerstrøm (UMB, Norway)
Transcript of Anette åkerstrøm algalbioremediation15_11_12
Algal bioremediation of a high strength wastewater-Growth, Nutrient
removal and Biomass productionAnette Åkerström
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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.
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Energy
SludgeAnaerobic digestion
N/P rich sludge liquor
Algae production Low N/P
effluent
CO2
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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
Sludge liquorTotal Nitrogen
(mg/L) 1210
Total Phosphorus (mg/L) 28
Total suspended solids (mg/L) 1590
COD (mg/L) 3700
Light transmission (670 nm, 1 cm
light path) 2.8 %
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Concentration of sludge liquor (%)
% Light transmission
Total Phosphorus (mg/L)
12 85 4
25 71 8
40 20 11
50 15 14
70 8 19
100 2.8 28
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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.
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Concentration of sludge liquor (%)
12 25 40 50 70 100
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0,55
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0,95
t2= 5
t2= 6
t2= 7
t2= 8
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P-limitation Light limitation
Growth rate of the batch cultures from the start of the experiment and to day 5,6, 7 and 8.
Algae can grow in pure sludge liquor but the growth rate can be increased by increasing the light transmission by dilution.
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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
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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.
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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.
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Acknowledgements
Thanks to BioWater AS, Silje Roksti (our algae technicians) and Trina Halfhide (Fulbright scholar and algaeneer).
Thank you for your attention!
Alg
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