Hydrogen sulphide control in sewers by catalysing the reaction with oxygen

This work for the first time shows possible advantage of using ferrous as a catalyst to selectively oxidise hydrogen sulphide in sewer water where biological activity is present. Ferrous catalysed the oxidation reaction in all conditions, but the oxygen requirement for the chemical oxidation of sulp...

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Bibliographic Details
Published in:The Science of the total environment 2019-11, Vol.689, p.1192-1200
Main Authors: Rathnayake, Dileepa, Sathasivan, Arumugam, Kastl, George, Bal Krishna, K.C.
Format: Article
Language:English
Subjects:
Ferrous chloride
Gaseous phase
H2S control
Hydrogen sulphide
Sewer corrosion
Sulphate-reducing bacteria
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Summary:This work for the first time shows possible advantage of using ferrous as a catalyst to selectively oxidise hydrogen sulphide in sewer water where biological activity is present. Ferrous catalysed the oxidation reaction in all conditions, but the oxygen requirement for the chemical oxidation of sulphide varied depending on the initial conditions (pH, concentrations of sulphide and oxygen). For initial concentrations of O2 and S2− exceeding 2 mg/L, and a pH between 7.3 and 8.3, approximately 1 mg-O2 was required to oxidise 1 mg-S2−. For the typical conditions experienced in a sewer (pH  2 mg/L.•The sulphide in sewer can be selectively oxidised by adding a small amount of ferrous.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2019.06.326