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Physicochemical properties and membrane biofouling of extra-cellular polysaccharide produced by a Micrococcus luteus strain |
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| Authors: | Lei Feng Xiufen Li Ping Song Guocheng Du Jian Chen |
| Affiliation: | 1. College of Resoure and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian Province, People’s Republic of China 2. Lab of Environmental Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu Province, People’s Republic of China 3. College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian Province, People’s Republic of China 4. School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu Province, People’s Republic of China |
| Abstract: | The physicochemical properties of the extra-cellular polysaccharide (EPS) produced by a Micrococcus luteus strain, a dominating strain isolated from membrane biofouling layer, were determined in this study. The EPS isolated from this strain was measured to have an average molecular weight of 63,540 Da and some typical polysaccharide absorption peaks in Fourier transform infrared spectrum. Monosaccharide components of the EPS contained rhamnose, fucose, arabinose, xylose, mannose, galactose and glucose in a molar ratio of 0.2074:0.0454:0.0262:0.0446:1.7942:1.2086:0.4578. Pseudo plastic properties were also observed for the EPS through the rheological measurement. The EPS was further characterized for its behavior to cause membrane flux decline. The results showed that both flux declines for polyvinylidenefluoride (PVDF) and polypropylene membranes became more severe as EPS feed concentration increased. A higher irreversible fouling for the PVDF membrane suggested that the EPS had the larger fouling potential to this microfiltration membrane. |
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