摘要
微藻固碳已经成为消减温室气体排放的新的研究热点。利用静态吸收方法,考查了通入纯CO2对普通小球藻生长特点、固定CO2效率以及藻液pH值变异的影响。结果表明:通入纯CO2使小球藻生长延滞期显著延长,比普通培养延长10～12 d,对其他生长阶段的影响不大;小球藻固定CO2速率可分为2个过程,即物理固碳过程和生物固碳过程,前者在藻细胞延滞期发生,峰值由CO2溶解于培养液造成,后者在藻细胞生长的指数期、稳定期和衰退期发生,峰值由藻细胞指数生长造成,2个过程中,固定CO2速率的变化趋势都是先增大后降低;纯CO2条件下,藻液pH值变化速率高,4 d内,藻液即被酸化,随后藻液pH值变化速率逐渐降低,且pH值稳定在适宜水平。因此,采用小球藻固定高浓度CO2时,建议提高接种量并加强培养前期的pH值监测和调控,以保证藻液保持适宜的pH值,并缩短培养时间,提高生物固碳效率。
CO2 fixation by microalgae is a new hot issue for CO2 reduction. Based on static CO2 absorption method, experiment was designed to study the influence of CO2 on growth of Chlorella vulgaris, CO2 reduction and medium pH at the aeration of purified CO2. The results showed that injection pure CO2 significantly prolonged the lag phase of cell growth, prolonging 10 - 12 d, but it had no impact on other growth phases. Process of CO2 fixa- tion was divided into physical fixation process and biological fixation process, the former occurred in the cell lag phase and its peak value was caused by CO2 dissolved in culture medium. The latter occurred in the exponential phase, stable phase and decline phases, its peak value was caused by exponential growth of C. vulgaris. All of ef- ficiency of CO2 fixation in two processes showed a trend of first increase and then decrease. Moreover, culture medi- um pH varied markedly and medium was sharply acidized in 4 days, then culture medium pH few changed and main- tained at the suitable level. Therefore, it was suggested that high inoculum concentration and high-densitily monitoring and control of medium pH are necessary at the aeration of high concentration of CO2, which will maintain appropriate medium pH, and shorten culture time in order to improve the efficiency of CO2 fixation.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第12期4566-4572,共7页
Chinese Journal of Environmental Engineering
基金
"十二五"国家科技计划农村领域首批项目(2011BAD15B02)
国家自然科学基金青年基金项目(41101270)
关键词
生物固碳
普通小球藻
CO2捕捉微藻培养
biological CO2 fixation
Chlorella vulgaris
CO2 capture
cuhuration of algae
