Concept

Nitrite

Publications associées (33)

DENITRIFYING PAO AND GAO IN AEROBIC GRANULAR BIOFILM CULTIVATED WITH ACETATE AND PROPIONATE

Christof Holliger, David Gregory Weissbrodt, Samuel Lochmatter, Graciela Gonzalez Gil

Phosphate accumulating organisms (PAO) and glycogen accumulating organisms (GAO) play an important role in aerobic granular biofilm systems used for wastewater treatment. Both are slow growing organisms which can take up and store carbon under anaerobic co ...

2009

Comparison of the denitrification potential of aerobic granules cultivated with acetate and propionate

Christof Holliger, David Gregory Weissbrodt, Samuel Lochmatter, Graciela Gonzalez Gil

Simultaneous nitrification-denitrification has been observed in aerobic granular sludge sequencing batch bubble column reactors fed with either acetate or propionate with elimination rates of up to 60-70%. Several in-situ tests under anoxic conditions were ...

2009

Nitrogen removal from digested manure to decrease ammoniac emissions from agriculture

Christof Holliger

Biogas production transforms organic matter into methane, carbon dioxide and ammonia (NH3). The aim of this study was reducing NH3 emissions from liquid effluents of agricultural anaerobic digesters. An alternative to classic nitrification-denitrification ...

2007

Ozone transfer and design concepts for NOM decolourization in tubular membrane contactor

Urs von Gunten

Ozonation membrane contact was carried out with a tubular membrane module to study the effects of the flow rates and the temperatures of the liquid phase on ozone transfer and on the enhancement of mass fluxes. Changes in liquid temperature gave both posit ...

2005

Relationship between atmospheric pollution characterized by NO2 concentrations and testate amoebae density and diversity

Edward Mitchell

To assess the potential use of testate amoebae as biomonitors of atmospheric pollution we studied the relationship between atmospheric nitrogen dioxide (NO2) pollution and testate amoebae density, diversity, and community structure (Protista: Rhizopoda) in ...

2004

Oxidation of Nitrite by Peroxynitrous Acid

The kinetics of the oxidn. of nitrite to nitrate by peroxynitrous acid at pH 5.2 is best described by the rate law kobs = kiso + k'[NO2-] + k''[NO2-]2, in which the peroxynitrous acid isomerization rate const. kiso = (1.10 +- 0.05) s-1, k' = (3.2 +- 0.1) M ...

2003

Structured multiphase reactors based on fibrous catalysts: nitrite hydrogenation as a case study

Albert Renken, Lioubov Kiwi, Volker Höller

A reactor concept designed as a bubble column staged with fibrous catalytic layers is tested on pilot-scale for the redn. of nitrite to N by H. CO2 is used to neutralize the hydroxide ions produced during hydrogenation of nitrite. The effective reaction ra ...

Elsevier2001

Reduction of nitrite-ions in water over Pd-supported on structured fibrous materials

Albert Renken, Lioubov Kiwi, Volker Höller

Catalytic hydrogenation of NO2- in water to N2 over Pd-supported on different woven fibrous materials was studied. Low porosity C fiber, low porosity D-type glass fiber, and composite (glass covered by g-Al2O3) fiber were used. Pd dispersion was compared f ...

2001

Ab initio molecular dynamics simulations of the gas-phase reaction of hydroxyl radical with nitrogen dioxide radical

Ursula Röthlisberger

The reaction between the hydroxyl radical and the nitrogen dioxide radical in the gas phase has been studied with ab initio mol. dynamics simulations based on d. functional theory. Nitric acid HONO2 and cis-cis peroxynitrous acid ONOOH are formed spontaneo ...

1998

Heterogeneous kinetics of some atmospherically relevant reactions

A low pressure reactor (Knudsen cell) coupled to molecular beam modulated mass spectrometry was used to study the heterogeneous kinetics of the following three systems: (1) NO2 on amorphous carbon, (2) H2O vapor on ice and (3) gaseous HCl on ice. The first ...

EPFL1996

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