Anoxic sulfide oxidation in wastewater of sewer networks

Investigations on anoxic sulfide oxidation in wastewater under sewer conditions are presented. Batch tests were designed and conducted to study both chemical and biological sulfide oxidation by nitrate in the water phase. Oxidation at pH 7.0 and 8.5 was performed in parallel and wastewater with anae...

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Bibliographic Details
Published in:Water science and technology 2005-01, Vol.52 (3), p.191-199
Main Authors: YANG, W, VOLLERTSEN, J, HVITVED-JACOBSEN, T
Format: Article
Language:English
Subjects:
Adaptation
Aerobiosis
Anaerobic processes
Anaerobiosis
Anoxia
Anoxic conditions
Applied sciences
Biological effects
Buildings. Public works
Exact sciences and technology
Hydrogen-Ion Concentration
Nitrates - analysis
Nitrates - chemistry
Oxidation
Oxidation process
Oxidation-Reduction
Oxygen - analysis
Oxygen - metabolism
pH effects
Pollution
Sewage - chemistry
Sewage - microbiology
Sewerage works: sewers, sewage treatment plants, outfalls
Sewerage. Sewer construction
Sewers
Storage
Sulfate reduction
Sulfide compounds
Sulfides
Sulfides - chemistry
Sulfides - metabolism
Sulfur
Sulphate reduction
Sulphides
Sulphur
Waste Disposal, Fluid
Wastewater
Wastewater oxidation
Water Pollutants - metabolism
Water treatment and pollution
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Summary:Investigations on anoxic sulfide oxidation in wastewater under sewer conditions are presented. Batch tests were designed and conducted to study both chemical and biological sulfide oxidation by nitrate in the water phase. Oxidation at pH 7.0 and 8.5 was performed in parallel and wastewater with anaerobic storage period of 0, 3, 4, 6 days was used. Initial sulfide concentrations at a level of 0-4.1 g S m(-3) were applied by either addition or sulfate reduction. Results showed that wastewater in sewers was capable of biological, but not chemical, sulfide oxidation under anoxic conditions. Elemental sulfur was the end-product during the experiment. Nitrite accumulates in wastewater as an intermediate. The anoxic oxidation rates for fresh wastewater was 0.48 g S m(-3) h(-1) at pH 7.0 and 0.62 g S m(-3) h(-1) at pH 8.5, which accounted for less than 30% of the potential aerobic oxidation rates. A long-term anaerobic adaptation of the wastewater was found to inhibit the oxidation process.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2005.0076