Titration biosensors for the estimation of the biochemical nitrate demand of municipal and industrial wastes |
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Authors: | A Onnis A Carucci G Cappai |
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Institution: | (1) DIGITA, Department of Geoengineering and Environmental Technologies, University of Cagliari, Piazza d‘Armi, 09123 Cagliari, Italy |
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Abstract: | An anoxic titrimetric test was investigated for measuring denitrification potential of different wastewaters, both municipal
and industrial, and to quantify the denitrifying activity in an activated sludge system. The method measures the amount of
acid that is required to maintain the pH set-point value in a batch denitrification experiment, and it was performed using
a DENICON (denitrification controller) biosensor. The amount of acid is proportional to the nitrate used to oxidise the biodegradable
chemical oxygen demand present in the wastewater, while the acid consumption rate is used to derive the denitrifying activity.
The wastewaters tested were a municipal wastewater (MW), an industrial-municipal wastewater (MIW; 70% and 30%, respectively),
and four industrial wastewaters drawn from an ice-cream factory (IW1), a beet-sugar factory (IW2), a brewery (IW3), and a
tuna cannery industry (IW4). Good correlation between titration data and analyses was found. |
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Keywords: | Denitrification potential Industrial wastewaters Titrimetric biosensor |
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