Supercritical water oxidation of feeds with high ammonia concentrations Pilot plant experimental results and modeling

Complete oxidation of feeds with concentrations of ammonia up to 7 wt.% in supercritical water using an autothermal cooling wall reactor at pilot plant scale using isopropyl alcohol (IPA) as auxiliary fuel and air as oxidant is studied. Complete NH sub(3) removal is obtained with stoichiometric air...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2008-04, Vol.137 (3), p.542-549
Main Authors: BERMEJO, M. D, CANTERO, F, COCERO, M. J
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Hydrodynamics of contact apparatus
Other industrial wastes. Sewage sludge
Pollution
Reactors
Wastes
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Summary:Complete oxidation of feeds with concentrations of ammonia up to 7 wt.% in supercritical water using an autothermal cooling wall reactor at pilot plant scale using isopropyl alcohol (IPA) as auxiliary fuel and air as oxidant is studied. Complete NH sub(3) removal is obtained with stoichiometric air quantity and residence times of 40 s. TOC and ammonia removal increase with temperature up to a value above which any improvement is noticed. The results show that in these conditions, the reaction temperature necessary for reaching the total TOC and NH sub(3) removal is higher when the ammonia concentration is increased. Simulations of the experimental results with a mathematical model of the reactor show that the oxidation rate of ammonia obtained in the reactor is higher than the fastest kinetic data found in literature.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2007.05.010