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|dc.title||Simultaneous ammonium-nitrogen and copper removal, and copper recovery using nitrifying biofilm from the Ultra-Compact Biofilm Reactor|
|dc.identifier.citation||Lee, L.Y., Ong, S.L., Ng, H.Y., Hu, J.Y., Koh, Y.N. (2008-09). Simultaneous ammonium-nitrogen and copper removal, and copper recovery using nitrifying biofilm from the Ultra-Compact Biofilm Reactor. Bioresource Technology 99 (14) : 6614-6620. ScholarBank@NUS Repository. https://doi.org/10.1016/j.biortech.2006.10.048|
|dc.description.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.|
|dc.subject||Extracellular polymer substance|
|dc.contributor.department||DIVISION OF ENVIRONMENTAL SCIENCE & ENGG|
|Appears in Collections:||Staff Publications|
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