AI Article Synopsis
- The study focused on evaluating soluble microbial products (SMP) in an aerobic granular sludge system during denitrification, particularly looking at how different chemical oxygen demand/nitrogen (C/N) ratios affected the process.
- Results showed that nitrate (NO-N) concentrations were significantly lower at a C/N ratio of 6 compared to 1, indicating better denitrification efficiency with higher C/N ratios.
- The analysis of SMP revealed an increase in protein and polysaccharide content with rising C/N ratios, and different types of SMP were identified, with biodegradable protein-like substances making up a significant portion of the total SMP.
Article Abstract
In present study, the characteristics of soluble microbial products (SMP) were evaluated in aerobic granular sludge system during denitrification process under different chemical oxygen demand/nitrogen (C/N) ratios. Batch experiment showed that the effluent nitrate (NO-N) concentration were 15.24 ± 1.83 and 1.72 ± 1.53 mg/L at C/N ratio of 1 and 6, respectively. For the release of SMP, the protein (PN) and polysaccharide contents increased from 1.23 ± 0.38 and 7.46 ± 1.13 mg/L to 1.80 ± 0.76 and 10.53 ± 1.24 mg/L with increasing C/N ratios, respectively. Excitation-emission matrix identified four peaks in SMP, including aromatic PN-like, tryptophan PN-like, fulvic acid-like and humic acid-like substances. Fluorescence regional integration suggested that biodegradable PN-like substances occupied the percentage between 53.0 and 61.7% in SMP. Synchronous fluorescence spectra coupled with two-dimensional correlation spectroscopy indicated that the release of SMP fractions in the early stage (0-150 min) changed in the following sequences: PN-like fraction > fulvic acid-like fraction.
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| http://dx.doi.org/10.1007/s00449-018-1918-z | DOI Listing |
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