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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. 13, No. 10, 2016, pp. 2325-2338
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Bioline Code: st16216
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. 13, No. 10, 2016, pp. 2325-2338
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Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy
Guerrero, L.; Montalvo, S.; Huiliñir, C.; Barahona, A.; Borja, R. & Cortés, A.
Abstract
One of the technologies used for wastewater
nitrogen removal consists in simultaneous nitrification–denitrification. The low microbial growth rate and the low
availability of organic material for the denitrification stage
make it necessary to study new operational conditions and
the use of microbial supports. The aim of this study was to
evaluate the operational behavior of a simultaneous nitrification–denitrification process in a sequential batch reactor
utilizing zeolite as a biomass support and step-feed strategy.
Two reactors of 2 L were used, one with zeolite and
another without zeolite, both operated at constant temperature
(31 °C), varying nitrogen loading rate (NLR) from
0.041 to 0.113 kg total Kjeldahl nitrogen (TKN/m3/day).
After 209 days, removals higher than 86 and 96 % in
nitrogen compounds and organic matter were obtained,
respectively. There was not accumulation of nitrate and
nitrite in any case; this means that there was a simultaneous
nitrification–denitrification in the reactors. The incorporation
of zeolite in the system held higher concentration of
biomass in the reactor; this led to reduce start-up to 21 days
and to improve 11.31 % removal kinetic. The use of a stepfeed
strategy prevents events of inhibition by substrate,
even duplicating tolerance to higher NLR for the same
operation time.
Keywords
Sequential batch reactor; Simultaneous nitrification–denitrification; Step-feed; Zeolite
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