Journal
BIORESOURCE TECHNOLOGY
Volume 255, Issue -, Pages 29-38Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.01.113
Keywords
EEM-PARAFAC; Dissolved organic matter; Oxygen uptake rate; Soluble microbial products; Saline wastewater; Two-dimensional correlation spectroscopy
Funding
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT) [2017R1A4A1015393]
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Spectroscopic techniques were used to examine the subtle changes in soluble microbial products (SMP) of batch activated sludge bioreactors working at different salinities (i.e., 0%, 1%, 3%, and 5% NaCl). The changes in different fluorescent constituent were tracked by excitation-emission matrix combined with parallel factor analysis (EEM-PARAFAC), and the sequential production was further identified by two-dimensional correlation spectroscopy (2D-COS). Greater enrichment of tryptophan-like component and large-sized biopolymer were found in SMP for higher saline bioreactors, suggesting the SMP sources from bound extracellular polymeric substances and excreted intercellular constituents. 2D-COS revealed the opposite sequences of the fluorescence changes in SMP between the low and the high saline bioreactors, following the order of tyrosine-like > tryptophan-like > humic-like fluorescence for the latter. This study clarified the dominant mechanisms involved in SMP formation during elevating salinity, which were well supported by the changes in SMP spectroscopic features, microbial activity, and organic degradation rates.
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