Journal
BIORESOURCE TECHNOLOGY
Volume 218, Issue -, Pages 53-61Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.06.068
Keywords
Slowly biodegradable organic matters (SBOM); Carbon sources; Anaerobic anoxic oxic (AAO); Dissolved organic matters (DOM)
Funding
- National Natural Science Foundation of China [51508447, 51508451]
- National High Technology Research and Development Program of China [2011AA060903]
- Program for Innovative Research Team in Shaanxi (PIRT) [2013KCT-13]
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This study examined the distribution of carbon sources in two anaerobic anoxic oxic (AAO) sewage treatment plants in Xi'an and investigated the transformation characteristics and utilization potential of slowly biodegradable organic matters (SBOM). Results indicated under anaerobic and aerobic conditions, SBOM could be transformed at a rate of 65% in 8 h into more readily biologically utilizable substrates such as volatile fatty acids (VFAs), polysaccharides and proteins. Additionally, non-biodegradable humus-type substances which are difficult to biodegrade and readily accumulate, were also generated. These products could be further hydrolyzed to aldehyde and ketone compounds and then transformed into substances with significant oxygen-containing functional groups and utilized subsequently. The molecular weights of proteinoid substances had a wide distribution and tended to decrease over time. Long hours of microbial reaction increased the proportion of micromolecular substances. This particular increase generated significant bioavailability, which can greatly improve the efficiency of nitrogen removal. (C) 2016 Elsevier Ltd. All rights reserved.
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