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Odour control at a WWTP in a combined stormwater sewage ...
TasWater operates the Ti-Tree Bend (TTB) wastewater treatment plant (WWTP), a continuous mixed activated sludge (CMAS) plant, in Launceston, Tasmania. Launceston was one of the first cities in the southern hemisphere to have a sewer system dating back to the 1860’s. The WWTP was commissioned in 1974 and receives combined wastewater including stormwater, domestic and industrial waste.
Sulphide in wastewater can cause significant odour issues through the generation of hydrogen sulphide gas (H2S) in sewers and wastewater treatment plants. Ferrous iron salts (FeCl2) are added in excess to enable the precipitation of iron sulphide, effectively removing H2S. Flow paced iron salts dosing started on 31 August 2015.
The pH is also an important factor controlling the formation of H2S. The optimum pH to reduce the formation of H2S is approximately 8. The purpose of this report was to determine the optimal iron salts dosing levels and the effect of the dosing on the operability of Ti Tree Bend (TTB) sewage treatment plant (STP).
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