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Simultaneous ammonium-nitrogen and copper removal, and copper recovery using nitrifying biofilm from the Ultra-Compact Biofilm Reactor

Lee, L.Y.Ong, S.L.Ng, H.Y.Hu, J.Y.
Koh, Y.N.
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Abstract
Simultaneous ammonium-nitrogen (NH4 + s(-) N) and copper removal, and copper recovery in synthetic wastewater using nitrifying biofilm from an ultra-compact biofilm reactor (UCBR) was demonstrated in batch studies, which consisted of three phases: Phase 1 for NH4 + s(-) N and copper removals, Phase 2 for copper recovery, and Phase 3 for NH4 + s(-) N removal. The results showed that more than 96.3% of copper was removed within 60 min, while 60.1% of the adsorbed copper was recovered through rinsing the biofilms with 0.1 mM of ethylenediaminetetraacetic acid (EDTA). The nitrifying biofilm was able to adsorb 0.245 mg of copper/g of biofilms. After recovery treatment, 29.4% of copper remained bound within the nitrifying biofilms. No significant inhibitory effects towards NH4 + s(-) N removal in the presence of 0.92 mg copper/L was noted in Phase 1 compared with the control test. However, lower initial pH condition in the recovery process and the accumulation of copper on the biofilm led to 50% inhibition on NH4 + s(-) N removal efficiency in the subsequent phase. © 2007 Elsevier Ltd. All rights reserved.
Keywords
Ammonia-nitrogen removal, Copper recovery, Extracellular polymer substance, Nitrifying biofilm
Source Title
Bioresource Technology
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Series/Report No.
Organizational Units
Organizational Unit
CIVIL ENGINEERING
dept
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Date
2008-09
DOI
10.1016/j.biortech.2006.10.048
Type
Article
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