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Bioresour Technol. 2014;152:1-6. doi: 10.1016/j.biortech.2013.10.112. Epub 2013 Nov 7.

Partial nitrification of wastewaters with high NaCl concentrations by aerobic granules in continuous-flow reactor.

Author information

1
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
2
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China.
3
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan. Electronic address: djleetw@yahoo.com.tw.
4
Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
5
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.

Abstract

Wastewaters with high salinity are yielded that need sufficient treatment. This study applied aerobic granules to conduct partial nitrification reactions for wastewaters with high NaCl concentrations in a continuous-flow reactor. The present granules revealed partial nitrification performances at nitrite accumulation rate >95% and chemical oxygen demand (COD) removal at >85% at salt concentration up to 50 g l(-1). High salinity led to compact and tough granules. The granules applied electrogenic ion pump and sodium-calcium exchanger to reduce intracellular Na(+) concentration; generated amino acids as osmoprotectants to resist the high osmotic pressure; produced excess extracellular polysaccharides and proteins with secretion of c-di-GMP; revised microbial community with halophilic strains. The present continuous-flow aerobic granule reactor (CFAGR) is a promising process to convert ammonium in highly saline wastewaters to nitrite, which can be applied with a subsequent Anammox process for efficient nitrogen removal.

KEYWORDS:

Aerobic granules; Continuous-flow reactor; Microbial community; NaCl; Osmoprotectants

PMID:
24269852
DOI:
10.1016/j.biortech.2013.10.112
[Indexed for MEDLINE]

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