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Response of extracellular polymeric substances and enzymatic activity to salinity for the waste activated sludge anaerobic fermentation process

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Abstract

Salinity (NaCl) was used in waste activated sludge (WAS) anaerobic fermentation system which had been presented to greatly enhance the extracellular polymeric substance (EPS) production including protein and polysaccharide and short-chain fatty acids (SCFAs). Salinity enhanced soluble protein and polysaccharide (SB-EPS) release which was 4.04 times (protein) and 1.83 times (polysaccharide) compared to 0 g/L NaCl level. More important, salinity restrained the coenzyme 420 activity (F420), but increased the hydrolase activity. Abundant hydrolysis of substrate and highly active hydrolase led to abundant SCFA production. Pearson correlation coefficient showed that the protein became the main reaction substrate for SCFA generation.

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Fig. 1
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Fig. 3

source conversion of SCFAs, T-protein-polysaccharide, T-DNA (a), and SCOD, SCFAs/SCOD, pH (b)

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Acknowledgements

The authors are grateful to the doctoral foundation and incubation project of Zhengzhou University of Light Industry (13501050052, 2018ZCKJ201), also supported by the foundation of Henan province natural science (182300410140).

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Authors and Affiliations

  1. Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450001, China

    Baodan Jin, Ju Zhang, Jiahui Niu, Ping Zhou, Jingwen Dai, Nuonan Li, Hongfan Tao, Zhigang Ma & Zhongfang Zhang

  2. Henan Hengan Environmental Protection Technology Co., Ltd., Zhengzhou, 450001, China

    Jintao Niu

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  1. Baodan Jin
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Correspondence to Baodan Jin.

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Jin, B., Niu, J., Zhang, J. et al. Response of extracellular polymeric substances and enzymatic activity to salinity for the waste activated sludge anaerobic fermentation process. Bioprocess Biosyst Eng 43, 737–745 (2020). https://doi.org/10.1007/s00449-019-02253-z

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