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Nitrate removal in a closed marine system through the ion exchange membrane bioreactor

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Abstract.
The accumulation of nitrate in closed marine systems presents a problem for both the marine life and
the environment. The present study, proposes the application of the ion exchange membrane bioreactor
(IEMB) concept for removing nitrate frommarine systems, suchas aquaculture tanks or marine aquariums.
The results obtained demonstrate that the IEMB was able to remove naturally accumulated nitrate
from water taken from a public marine aquarium (Oceanário de Lisboa) and bioconvert it, in an isolated
compartment (biocompartment), to molecular nitrogen, thus preventing secondary contamination of
the treated water by microbial cells, metabolic by-products and excess of carbon source (ethanol). This
system allowed for the removal of nitrate at concentrations of 251 and 380 mg/l down to below 27 mg/l
exchanging it for chloride.
Under the studied operating conditions, the IEMB proves to be a selective nitrate removing technology
preserving the initialwater composition with respect to cations, due to the Donnan exclusion effect from
the membrane, and minimizing the counter diffusion of anions other than nitrate and chloride, due to the
use of water with the same ionic composition in the biocompartment. This is an advantage of the IEMB
concept, since the quality of the water produced would allow for the reutilisation of the treated water in
the aquarium, thereby reducing both the wastewater volume and the use of fresh water.

Keywords:
Nitrate removal
Water reuse
Aquaculture
Marine aquariums
Ion exchange membrane bioreactor

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Informasi Detail

Judul Seri

Journal of Hazardous Materials

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Journal of Hazardous Materials 166 (2009) 428–434

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

LINGKUNGAN HIDUP

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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