Australia: Sewage spills into Hobart's River Derwent after power failure at TasWater treatment plant - PressFrom - Australia
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AustraliaSewage spills into Hobart's River Derwent after power failure at TasWater treatment plant

18:59  12 august  2019
18:59  12 august  2019 Source:   abc.net.au

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Sewage treatment is the process of removing contaminants from municipal wastewater, containing mainly household sewage plus some industrial wastewater.

Sanitary sewer overflow (SSO) is a condition in which untreated sewage is discharged from a sanitary sewer into the environment prior to reaching sewage treatment facilities. When caused by rainfall it is also known as wet weather overflow.

Sewage spills into Hobart's River Derwent after power failure at TasWater treatment plant© Provided by Australian Broadcasting Corporation The spill is not the first at the plant. (ABC News)

Six million litres of untreated sewage and stormwater has spilled into Hobart's River Derwent after a power failure at the city's treatment plant.

Hobart City Council and the Environment Protection Authority are investigating the impact of the spill on the environment, while TasWater is examining what happened TasWater's Macquarie Point Sewage Treatment Plant on Sunday.

The treatment plant returned to operations on Monday.

TasWater acting regional services department manager Brendan Hannigan said the results from water sampling would be released on Tuesday.

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Sewage treatment , or domestic wastewater treatment , is the process of removing contaminants from wastewater and household sewage , both runoff Sewage is created by residences, institutions, hospitals and commercial and industrial establishments. It can be treated close to where it is created

"Our initial investigations are there is very good dispersal across the Derwent River from this particular outfall," Mr Hannigan said.

"It is a very large part of the river, it's a deep part of the river, we've had no signs reported to us of any visible impacts — but to confirm this, we've undertaken a series of samples north of the outfall."

Water was tested north of the Tasman Bridge, at Eastern Shore beaches and near the CSIRO, Mr Hannigan said.

"We are casting our sampling net far and wide to see if there are any indications and by tomorrow we should have results of those sample tests to confirm if we can find any contamination as a result of this incident," he said on Monday.

TasWater has committed to implementing any recommendations from its review of the incident.

Ten million litres of sewage was pumped into the River Derwent from the same treatment plant on December 31 last year.

That incident was caused by a 24-hour failure in the plant's effluent chlorination process.

The ABC has contacted the Public Health and the Environment Protection Authority for comment.

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