Work is continuing at Hexham STW to rebuild two of the existing filters.
The walls have now been completely replaced with precast units and new filter tiles placed on the existing base. These filter tiles will provide the air circulation and drainage under the media to keep the biological elements healthy and prevent the media from clogging with deposits.
The edge beam has also been cast around both filters to tie the precast walls in place. This beam has gained enough strength to allow the installation of the filter media to begin.
The filter media will be delivered to site from today at a rate of around 300t per day. It will then be washed to remove any fines and dusts which could clog the treatment works, before being placed in the filters by the long reach excavator and spread by the mini digger left inside the filter bed for that purpose.
We expect this process to take 2-3 weeks during which time there will be increased construction traffic coming into the site.
Thanks for taking the time to read the update. Photos are also attached which may provide a better understanding.