Thanks to the Infrastructure Department (DoI) for inviting SOS Jersey to see the new Sewage Treatment Works (STW) plans. There are pros and cons for any design and this has been the one chosen to go with, assuming all planning permissions are granted.

Benefits of the new STW in Jersey
Some benefits of the new STW in Jersey

The drop-in session and exhibition on Thurs 2nd February was nicely done with the team, including CEO John Rogers, Minister Eddie Noel and Environment’s Tim de Feu, ready to answer questions; DoI have kindly given permission for us to show their materials here.

If you are teachers with geography or science groups, we believe this would make a good outing/project work – if interested, you’ll need to contact DoI rather than us 🙂

Here is what the DoI say, and the PDFs of the posters are worth looking at; all links open in new windows/tabs:

New sewage treatment works

The sewage treatment works (STW) has been in operation for almost 60 years. There have been many upgrades but because of its age this is no longer possible.

The current STW:

  • is inefficient
  • requires significant maintenance
  • fails the current required nitrogen standards

Construction of a new STW will begin Spring 2018. The work will be in phases, with a completion date of mid 2022.

During this time the existing STW will remain in operation.

Watch the liquid waste strategy video on YouTube

Watch the animated concept video of new sewage treatment works development on YouTube

Download information panel on condition of current STW (445kb)

Download information panel on new STW (386kb)

Download information panel on new STW programme (314kb)

Download information panel on sewage treatment process (427kb)

Download information panel on new STW benefits (353kb)

What happens to your sewage

When you flush a toilet or empty a sink it goes to the sewage treatment works.

There are 107 pumping stations keeping the sewage flowing in the right direction.

The sewage treatment works provides:

  • primary settlement
  • biological treatment by the activated sludge process
  • ultra-violet disinfection

The cleaned water is then discharged into St Aubin’s Bay.

There are stringent EU standards for discharge into bathing waters. The standards are set out in the discharge certificate.

The Department of the Environment issues the discharge certificate.

Computer systems check the STW and pumping stations.  If there is a problem the operator’s mobile phone will receive an alarm. Operators are on call 24 / 7 to fix any problems straight away.

Treatment of sludge

The sewage sludge is pasteurised then anaerobically digested to remove all harmful pathogens.
The resulting treated biosolids are thickened and recycled as fertilizer.

Download waste water treatment diagram (size 619kb)

Trade effluent

If you run a business you may need permission to discharge trade effluent.
Download trade effluent consent form (size 257kb)





SOSJ view plans for proposed new Sewage Treatment Works
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