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This study investigated using chemical flocculation with aluminum chloride (AlCl3) to harvest the microalgae Chlorella vulgaris ESP-31. The effects of initial biomass concentration and AlCl3 dosage on flocculation efficiency were examined. Results showed that higher AlCl3 dosages and initial biomass concentrations improved flocculation efficiency. At least 90% flocculation required higher AlCl3 dosages and flocculation rates for higher initial biomass concentrations. AlCl3 was found to be an efficient coagulant for recovering oil-rich C. vulgaris biomass.
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Jsc revised rifka-presentation for-990626_(revised[1]
- 1. Rifka Aisyah 1 Kuei-Ling Yeh 1 , Chun-Yen Chen 1,2 and Jo-Shu Chang 1,2,3 * 1 Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan 2 Sustainable Environment Research Center, National Cheng Kung University, Tainan, Taiwan 3 Center for Biosciences and Biotechnology, National Cheng Kung University, Tainan, Taiwan NSC 98-2221-E-006-240-MY3 Harvesting Chlorella vulgaris ESP-31 for Biofuels Production by Flocculation with Coagulant Addition Date 2010.06.26
- 10. 40 ml [Initial biomass] = 0.81 g/l [Initial biomass] = 1.60 g/l [Initial biomass] = 2.40 g/l [Initial biomass] = 3.22 g/l [Initial biomass] = 4.00 g/l AlCl 3 stock solution Blank 0.1 g/l 0.2 g/l 0.3g/l 0.5 g/l pH = 7.00 3 cm from surface water 2/3 from bottom of tube 1/2 from bottom of tube Cell density Measurement using UV (Wavelength = 688 nm) 0.7 g/l 0.9 g/l 0.7 g/l 1.1 g/l 0.7 g/l 0.9 g/l 0.7 g/l 0.9 g/l 1.1 g/l 1.3 g/l EXPERIMENTAL PROCEDURES 3 min 6 min 10 min . . . 120 min
- 17. COMPARISON OF FLOCCULATION PERFORMANCE AT DIFFERENT INITIAL BIOMASS CONCENTRATION Initial OD 688 Initial biomass concentration (g/l) Dose of AlCl 3 needed to obtain at least 90% flocculation efficiency (g/l) Specific flocculation rate needed to obtain at least 90% flocculation efficiency (%/min) 4.07 0.81 0.2 10.67 8.00 1.60 0.5 27.79 12.00 2.40 0.5 14.90 16.10 3.22 0.7 8.90 20.00 4.00 0.7 10.38
- 19. Thank you for your attention!!
Editor's Notes
- Good morning everyone, my name is Rifka. I am from National Cheng Kung University. My advisor is Professor Jo-Shu Chang. Now, I would like to present our experiment about…
- The, we increased the initial biomass concentration to … … … .. Because we think that algal suspension need more coagulant when its concentration was increased, then we add more coagulant to the suspension.
- This page showed us the effect of AlCl3 dosage on flocculation performance when initial biomass concentration was controlled at 0.81 g/l. We can see that both flocculation rate and highest flocculation rate increased as AlCl3 concentration was increased. However, by simply adding 0.2 g/l AlCl3 we can obtained more than 90% flocculation efficiency.
- This page showed us the flocculation performance when initial OD was 1.60 g/l. The trend of both specific flocculation rate and highest flocculation eff increased when the AlCl3 concentration increased. However, to get 90% flocc eff we need to add 0.5 g/l AlCl3, which means we need more coagulant to coagulate