Journal
BIORESOURCE TECHNOLOGY
Volume 139, Issue -, Pages 170-175Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.03.037
Keywords
Granular sludge; Tetracycline stress; Extracellular polymeric substances; Sludge properties
Funding
- China Scholarship Council
- Independent Innovation Foundation of Shandong University [2010JQ012]
- Program for New Century Excellent Talents in University [NCET-10-0528]
- Natural Science Foundation for Distinguished Young Scholars of Shandong province [JQ201116]
- National Natural Science Foundation of China [51178254]
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In this study, the response of nitrifying granules (NG) and conventional granules (CG) to tetracycline (TC) was compared. The presence of TC made granules break down into small fractions and led to nitrite accumulation in nitrifying system; while it had little toxic effect on CG system. Specific oxygen uptake rate tests showed 3.3% inhibition of ammonium oxidizing bacteria and 25.7% inhibition of nitrite oxidizing bacteria in the NG system. Granules produced more extracellular polymeric substances (EPS) to protect themselves from the TC stress, with higher production of proteins compared to polysaccharides. FTIR data also revealed significant changes of protein functional groups, while only small changes in polysaccharides functional groups were found. Three dimensional excitation-emission matrix fluorescence spectroscopy showed a decrease of peak intensity, indicating quenching effect of TC on EPS fluorescence, and also a blue shift of peak position, indicating chemical changes of EPS components. (C) 2013 Elsevier Ltd. All rights reserved.
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