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Microalgae for C02 Fixation

Abdul Samat, Ida Nordiana (2012) Microalgae for C02 Fixation. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

The problem of climate change arising mainly from C02 emission is currently a critical environmental issue. Biofixation using microalgae has recently become an attractive approach to C02 capture as algal species naturally use C02 for photosynthesis. Nannochloropsis sp., Chaetoceros sp., Pavlova lutheri, and /sochrysis galbana were cultivated in 1 L vessels to determine the best microalgal strain. Cell density of each microalgae culture Nannochloropsis sp., Isochrysis galbana, Pavlova lutheri and Chaetoceros sp. yield result of 35.0xl06 , 7.0xl06 , 2. 75x106 , and l.Oxl06 ce!ls/ml, respectively. Maximum biomass formation rate, Xmax (mg L "1d"1 ) and and lipid content of selected microalgal strain, Nannochloropsis sp. were 22 and 46, respectively. Nannochloropsis sp. cells were further cultured in 5 L working volume of bioreactor. Microalgal strains were grown under different temperatures and different air flow rates to fmd out optimum range. The effects of C02 concentration on growth and lipid content were also investigated. Nannochloropsis sp. was considered the best species among all other species with maximum biomass formation rate, Xmax (mg L"1d"1 ) and and lipid content of 22 and 46 mg/L, respectively. Optimum temperature and C02 fixation rate (mg/L) was 25°C and 488.8, respectively. C02 supply with continuous aeration gave a significant difference in result, culture with C02 supply lead to higher biomass productivity of 420 mg/L. Air flow rate of 2 L/min gives better result compared to I Llmin aeration, with 520 mg/L dry weight and 110 mg/L lipid content; the higher flow provides more C02, thus accelerate growth. Maximum specific growth rate of5 L cultivation was higher than 1 L cultivation of39 x 106 and 35 x 106 cells d"1 , respectively. While doubling time was 8.8 and 10.8 day for l L cultivation and 5 L cultivation, respectively.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Catalysis
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 25 Oct 2013 09:49
Last Modified: 25 Jan 2017 09:40
URI: http://utpedia.utp.edu.my/id/eprint/9870

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