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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 2, 2014, pp. 263-268
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Bioline Code: st14027
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 11, No. 2, 2014, pp. 263-268
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A poly-ε-caprolactone based biofilm carrier for nitrate removal from water
Rodrigues, A. L.; Machado, A. V.; No´brega, J. M.; Albuquerque, A.; Brito, A. G. & Nogueira, R.
Abstract
Nitrate removal from water has been accomplished
by heterotrophic biofilms using organic carbon as a
source of reducing power. To overcome the natural limitation
in organic carbon in water, a poly-ε-caprolactone based
biofilm carrier that serves simultaneously as a biofilm
carrier and as a source of organic carbon was developed and
tested in the present work. The feasibility of the new biofilm
carrier for nitrate removal from water was evaluated in a
packed bed reactor. The combination of size and structure
provided a carrier element having high surface area and void
volume, 1,170 m2/m3 and 67 %, respectively. A maximum
denitrification rate of 4.4 mg N–NO3
-/(L.h) (9.2 mg
N–NO3
-/(m2.h)) was achieved in the packed bed reactor at
20 oC and pH 7.0. Main advantages of the biofilm carrier
developed in the present work are its mechanical stability in
water even after biofilm formation and controlled release of
organic carbon by enzymatic reactions. The proposed biotechnology
to remove nitrate from groundwater is robust
and easy to operate.
to remove
Keywords
Biodegradable polymer; Biofilm; Denitrification; Packed bed reactor; Solid carbon source
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