Five types of lignocellulosic materials were applied as the bio-carriers for low-cost algal biofilm cultivation of three algal strains. The effects of bio-carrier physicochemical properties and toxicity on algal cells growth and attachment were investigated. Rougher and hydrophilic bio-carrier could yield more algal biomass than smoother and hydrophobic bio-carrier. Pine sawdust (diameter: 0.420–0.595 mm) performed the best when cultured Diplosphaera sp. (9.61 g·m−2·day−1) biofilm. Meanwhile, bio-carriers could be leached by the culture medium during cultivation, and their energy conversion proprieties could be improved due to the reduced ash contents and the decreased crystallinities. In addition, Chlorella vulgaris growth tests indicated that pine sawdust (15.45%) leachate promoted cell growth, whereas rick husk (15.48%) and sugarcane bagasse (13.19%) leachate inhibited cell growth. And bio-carriers leachates also modified the chemical compositions (lipid, protein and carbohydrate) of algal cells and increased the corresponding saturated fatty acids methyl ester content (from 48.71 to 55.58–57.08%).
Bibliographical noteFunding Information:
This work was supported by the Post-doctoral Innovative Talents Support Program of China (BX20190147); The National Natural Science Foundation of China (No. 21466022 , 21766019 ); The Key Project of Jiangxi Provincial Department of Science and Technology ( 20161BBF60057 ).
- Algal biofilm
- Carrier toxicity
- Surface roughness