科研之友
微信
新浪微博
Facebook
分享链接
摘要
Biological sequestration of CO2 using microalgal route emerges as a promising option due to its cleaner approach which can be used to produce various forms of bioenergy. The current study reports on development of a new ceramic hydrophobic membrane and its application in an algal photobioreactor towards an efficient dissolution of CO2 during cultivation of Arthrospira sp. Clay-alumina based ceramic capillary support elements were coated with bentonite clay and surface modified using polydimethyl siloxane (PDMS) to impart hydrophobicity. The prepared membrane indicated pore size of 5.0 nm with around 35.3% porosity and contact angle of 147 degrees. A two-element membrane module having 150 mm length, 3.16 outer diameter and 2.16 mm inner diameter was used as a nano bubble sparger to provide CO2 in 1 L of the culture medium and an enhanced overall mass transfer coefficient of about 38 x 10(-4) m/s was obtained using 19.5% CO2 gas mixture and 0.23 m/s gas velocity. The membrane was efficient in removal of dissolved oxygen produced during photosynthesis, resulting in higher algal growth and higher CO2 sequestration. Algal growth of about 178.2 g (dwt)/m(3)/day were obtained at 24 h interval of CO2 supply in the photobioreactor and subsequent CO2 sequestration obtained was 13.99 g/m(3)/h. Under optimized growth conditions the produced biomass yielded biodiesel content of about 5.82% of dry weight of algae. Application of the ceramic hydrophobic membrane thus enables enhanced mass transfer coefficient and dissolved oxygen removal efficiency making it suitable in photobioreactor application towards algal bio-sequestration of CO2 and subsequent biomass and biofuel production.
- 出版日期2017-11
