Journal
BIORESOURCE TECHNOLOGY
Volume 152, Issue -, Pages 1-6Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.10.112
Keywords
Aerobic granules; NaCl; Continuous-flow reactor; Osmoprotectants; Microbial community
Funding
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [HC201324]
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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. (C) 2013 Elsevier Ltd. All rights reserved.
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