Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 41, Issue 1, Pages 65-75Publisher
SPRINGER
DOI: 10.1007/s00449-017-1844-5
Keywords
High salinity; Simultaneous nitrification and denitrification (SND); Microbial activity; Extracellular polymeric substances; Humic substances
Funding
- National Natural Science Foundation of China [51178437]
- Special Grand National Science & Technology Project of China for Water Pollution Control and Treatment [2014ZX07203-008]
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The effect of increasing salinity on nitrogen removal via simultaneous nitrification and denitrification, microbial activities and extracellular polymeric substances (EPS) were investigated in a hybrid sequencing batch biofilm reactor filled with soft combination carriers. In the influent salinity range from 1.0 to 2.0%, average COD, NH4 (+)-N and TN removal efficiencies were higher than 97.1, 97.8 and 86.4% at the steady state. When salinity was increased to 2.5 and 3.0%, ammonium oxidation was obviously inhibited in the reactor. For both suspended sludge (S-sludge) and biofilm, specific ammonium oxidation rate, specific nitrite oxidation rate, specific oxygen uptake rate and dehydrogenase activity reduced with the increase of salinity. The quantity of total EPS increased with the increase of salinity from 1.0 to 2.0%. Generally, humic substances were the dominant composition of EPS in both S-sludge and biofilm, with the percentages of 43.9-54.0 and 43.8-64.6% in total EPS.
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