title: Dewatering of Chlorella pyrenoidosa using diatomite dynamic membrane: filtration performance, membrane fouling and cake behavior.
abstract: The diatomite dynamic membrane (DDM) was utilized to dewater Chlorella pyrenoidosa of 2 g dry weight/L under continuous-flow mode, whose ultimate algae concentration ranged from 43 g to 22 g dry weight/L of different culture time. The stable flux of DDM could reach 30 L/m(2) h over a 24 h operation time without backwash. Influences of extracellular organic matters (EOM) on filtration behavior and membrane fouling were studied. The DDM was divided into three sub-layers, the slime layer, the algae layer and the diatomite layer from the outside to the inside of the cake layer based on components and morphologies. It was found that EOM caused membrane fouling by accumulating in the slime and algae layers. The DDM intercepted polysaccharides, protein-like substances, humic-like substances and some low-MW organics. Proteins were indicated the major membrane foulants with increased protein/polysaccharide ratio from the slime layer to the diatomite layer as culture time increased. This method could be applied to subsequent treatment of microalgae coupling technology of wastewater treatment or microalgae harvesting for producing biofuel.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Aquatic Environment, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Yalei
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Aquatic Environment, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Yangying
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Aquatic Environment, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: chq123wd@163.com.
authors.forename: Huaqiang
authors.initials: H
authors.lastname: Chu
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Aquatic Environment, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Xuefei
authors.initials: X
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Aquatic Environment, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Bingzhi
authors.initials: B
authors.lastname: Dong
mesh_terms: D002708:Chlorella / Q000302:isolation & purification*; D007692:Diatomaceous Earth / Q000737:chemistry*; D005374:Filtration / Q000379:methods*; D008567:Membranes, Artificial; D018508:Water Purification
chemical_list: D008567:Membranes, Artificial; D007692:Diatomaceous Earth; C033787:diatomite
keywords: C. pyrenoidosa; Dewater; Diatomite dynamic membrane; EOM; Structure