nstantaneous and historical temperature effects on a-pinene
Removal of nutrients in denitrification system using coconut coir
fibre for the biological treatment of aquaculture wastewater
Author Details
ValsaRemonyManoj
(Corresponding
author)
Centre for Environmental Studies, AnnaUniversity, Chennai - 600 025, India
e-mail: talktovrmanoj@gmail.com
NamasivayamVasudevan
Centre
for Environmental Studies, AnnaUniversity, Chennai - 600 025, India
Publication Data
Paper received:
15
May 2010
Revised
received:
10
October 2010
Re-revised
received:
05
January 2011
Accepted:
05 February 2011
Abstract
Ideal bacterial support
medium for fixed film denitrification
processes/bioreactors must be inexpensive, durable and possess large surface
area with sufficient porosity. The present study has been focussed
on removing nitrate nitrogen at two different nitrate nitrogen loading rates
(60 (NLR I) and 120 (NLRII) mg l-1)
from simulated aquaculture wastewater. Coconut coir fibre
and a commercially available synthetic reticulated plastic media (Fujino Spirals) were used as packing medium in two
independent upflow anaerobic packed bed column
reactors. Removal of nitrate nitrogen was studied in correlation with other
nutrients (COD, TKN, dissolved orthophosphate). Maximum removal of 97% at
NLR-I and 99% at NLR ? II of nitrate nitrogen was observed in with either media.
Greater consistency in the case of COD removal of upto
81% was observed at NLRII where coconut
coir was used as support medium compared to 72% COD removal by Fujino Spirals. The results observed indicate that the
organic support medium is just as efficient in nitrate nitrogen removal as
conventionally used synthetic support medium. The study is important as it
specifically focuses on denitrification of
aquaculture wastewater using cheaper organic support medium in anoxic
bioreactors for the removal of nitrate nitrogen; which is seldom addressed as
a significant problem.
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