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Picture

Locals Maintain Pressure over Sewage Plant

8/2/2016

3 Comments

 
Odour complaints relating to the North Head plant operation are an ongoing issue for Manly residents but the issue is much bigger than unpleasant smells
PictureThe Plant is surrounding by National Park overlooking the ocean.
The North Head Plant now serves over one million people using 45 kms of pipeline from Blacktown, and ending 3ksm out to sea - a sewerage catchment of 470 square kilometres.

That puts Manly at the end of the longest ocean outfall in the world.
 
And yet North Head Wastewater Treatment Plant doesn’t have full primary treatment - only 30% of solids are captured from the inflow to the plant - the remaining 70% of solids are discharged to the ocean.

Re-usable sewerage sludge, or bio-solids, are trucked out of Manly to a disposable facility way out West.




All major sewage treatment plants in Australian States other than New South Wales perform secondary or tertiary treatment before discharging solids to the ocean
.
 
The Environment Protection Authority has been asked to intervene, and work with Sydney Water to achieve pollution reduction in the treatment process with recuperative thickening at the North Head plant, a move supported by Good For Manly.
 
(Recuperative thickening is a 1967 concept in which a portion of digested sludge is thickened and returned to the digester for further digestion. It is a cost effective way to defer major capital expenditure associated with constructing additional digester capacity.)
 
Sydney Water identified recuperative thickening as a process operation to increase digester capacity using existing assets for very little investment. The process was implemented at North Head in 2010.
 
However latest reports show that recuperative thickening at North Head, although not run full time due to plant limitations, has had limited impact with 2015 digester performance reported as being the same as it was in 2009, before recuperative thickening was implemented at the plant.
 
 A consultant to Sydney Water stated:
 "… optimal digester performance is an important aspect of odour control measures."
 
It’s interesting that recuperative thickening at Bondi Wastewater Treatment Plant achieved significant improvements: reducing biosolids production by 22%, increasing biogas production by 20% and reducing hydrogen sulphide generation from biosolids by 80%.
 
Clearly more needs to be done at the North Head Plant!
 
Manly Council brokered a public meeting between Sydney Water senior managers and concerned residents in November last year. The problem of unpleasant odours from the plant was the main topic, but many other issues were raised, such as decentralisation of wastewater treatment. 

However it became clear that there were no plans for any significant upgrades at the North Head plant. 

While follow up meetings with Sydney Water are planned for this year, it’s clear that unless we keep the pressure on, nothing will change. That means minimally-treated sewage will continue to be dumped into our ocean backyard and trucks transporting biosolids will continue to emit  biosolids offensive odours plus deodorant in Manly on the journey to the disposal facility. 
 
Do you think this should be allowed to continue?

3 Comments
stevemid
12/2/2016 06:33:55 am

Pumping our poo out to sea: I never have and never will understand it. Perhaps Manly could self-nominate to the comp that Environment Minister Greg Hunt just won: "Best poo doubletalk instead of treatment" award

Reply
Beverley Trevenen
12/2/2016 03:12:18 pm

Manly would probably get Greg Hunt's vote, he is quoted in SMH 2008
"We believe it's a national disgrace there's no action being taken, except at the margins, to clean up these outfalls."

Reply
Candy Bingham
21/2/2016 01:28:18 pm

Thanks Beverley for raising this. You can view Greg Hunt's article here: http://www.smh.com.au/national/sewage-outfalls-a-disgrace-hunt-20080102-1jv5.html

Funny how things change when you go from opposition to Minister responsible.

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    Candy Bingham, Manly Ward Councillor on Northern Beaches Council posts what's making news and issues relevant to Manly on this blog. 

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