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Citation: CHEN Cong-Li, ZHOU Yi-Han, CUI Xiao-Chun, WANG Jian-Wei. Mechanism of Exogenous Protein Stimulating Biofilm Formation in Wastewater Treatment and Reclaimation[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(7): 1061-1067. doi: 10.19756/j.issn.0253-3820.191064 shu

Mechanism of Exogenous Protein Stimulating Biofilm Formation in Wastewater Treatment and Reclaimation

1.
National Analytical Research Center of Electrochemistry and Spectroscopy, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
2.
School of Environment, Northeast Normal University, Changchun 130117, China;
3.
School of Life Sciences, Jilin University, Changchun 130012, China

Received Date: 28 January 2019
Revised Date: 16 April 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 51808103, 51722803, 51578117).

Microbes in the reclaimed water can form biofilms, which thus increases difficulties to the post-use of the reclaimed water. In this work, the effects of exogenous protein on biofilm formation was elaborated, and the mechanism was revealed by further exploring the micro-structure and characteristics of the biofilms. The results showed that there was a positive relationship of biofilm formation to experimental protein concentration in the range of 0-8.0 mg/L in typical effluents. The Zeta potential of bacterial cell suspensions decreased 35% upon the addition of 8 mg/L protein. The contact angle of bacterial cell suspensions decreased gradually with the increase of protein concentration, indicating that the protein could modify the cell surface to be more hydrophobic. In addition, exogenous protein could bridge with the functional groups on the cell surface, resulting in a weakened bacterial hydrophilicity and an enhanced cells aggregation. Extracellular polysaccharides produced under the stimulation could promote the maturation of biofilms. This study supplied some important information on advanced treatment of effluents after biological treatment.
- Biofilm,
- Exogenous proteins,
- Soluble microbial products,
- Hydrophobicity,
- Extracellular polysaccharides
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