The photocatalytic abatement of aqueous ammonia, the major nitrogen-containing compound in livestock manure, was investigated employing i) a batch reactor equipped with an immersion UVA lamp, containing aqueous suspensions of different commercial TiO2 powders and ii) a 40 L prototype plug flow photoreactor, suitable for the photocatalytic treatment of real swine and bovine manure, consisting of 9 vertical elements connected in series, internally coated with a TiO2 film, each one centrally housing a UVA lamp. A preliminary systematic investigation performed with the first photoreactor evidenced that ammonia conversion and the selectivity toward the main oxidation products (N2, NO2- and NO3-) depend on the amount of dissolved O2, on pH and on the photocatalyst’s amount and structural features. Extremely promising results, in terms of both ammonia conversion (up to the 88%) and selectivity to nitrogen gaseous species (99%), were achieved when the prototype photo-reactor was fed with suitably pre-treated manure. The TiO2-based photocatalytic treatment can thus be considered an effective remediation technology for the abatement of nitrogen-containing pollutants in surface and groundwater, originating from large-scale animal husbandries.

Photocatalytic abatement of ammonia in nitrogen-containing effluents / M. Altomare, G.L. Chiarello, A. Costa, M. Guarino, E. Selli. - In: CHEMICAL ENGINEERING JOURNAL. - ISSN 1385-8947. - 191:(2012 May 15), pp. 394-401. [10.1016/j.cej.2012.03.037]

Photocatalytic abatement of ammonia in nitrogen-containing effluents

M. Altomare
Primo
;
G.L. Chiarello
Secondo
;
A. Costa;M. Guarino
Penultimo
;
E. Selli
2012

Abstract

The photocatalytic abatement of aqueous ammonia, the major nitrogen-containing compound in livestock manure, was investigated employing i) a batch reactor equipped with an immersion UVA lamp, containing aqueous suspensions of different commercial TiO2 powders and ii) a 40 L prototype plug flow photoreactor, suitable for the photocatalytic treatment of real swine and bovine manure, consisting of 9 vertical elements connected in series, internally coated with a TiO2 film, each one centrally housing a UVA lamp. A preliminary systematic investigation performed with the first photoreactor evidenced that ammonia conversion and the selectivity toward the main oxidation products (N2, NO2- and NO3-) depend on the amount of dissolved O2, on pH and on the photocatalyst’s amount and structural features. Extremely promising results, in terms of both ammonia conversion (up to the 88%) and selectivity to nitrogen gaseous species (99%), were achieved when the prototype photo-reactor was fed with suitably pre-treated manure. The TiO2-based photocatalytic treatment can thus be considered an effective remediation technology for the abatement of nitrogen-containing pollutants in surface and groundwater, originating from large-scale animal husbandries.
photocatalytic NH3 oxidation ; TiO2 ; photo-reactor ; nitrogen abatement in manure
Settore CHIM/02 - Chimica Fisica
Settore AGR/10 - Costruzioni Rurali e Territorio Agroforestale
15-mag-2012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/174922
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