S3S cleaned out two anaerobic sewage lagoons for the Town of Hardisty, Alberta, using its patented clear-water-loop processing system.
S3S was contracted to clean out two anaerobic sewage lagoons. All settled solids had to be removed before clean, uncontaminated water could return to the lagoons.
The two lagoons had not been processed since the 1970s, and the town needed the lagoon volume to continue its sewage treatment program. Anaerobically digested biosolids dewater poorly, and their high nitrogen and phosphorus levels can recycle through the treatment process. S3S had to remove the original lagoon material and produce clean water that could be recirculated back into the lagoons.
S3S operated its patented clear-water-loop processing system, with centrifuges dewatering the material pumped from the lagoon. The self-powered, small-footprint system eliminated the costly liquid waste removal typical of a project this size and produced a waste with a higher solids content than typical pond remediation methods. Dry, stackable waste left site in standard unlined end-dump trucks, and clean water returned to the lagoon.
Every figure here comes from the Hardisty, Alberta lagoon project.
The program removed 550 tons of dry material from the two lagoons.
The dewatered material reached an average solids content of 33%.
Every batch of dry material passed its paint filter test.
The system kept feed, fine-solids conditioning, dewatering, water reuse, and loadout connected in one managed sequence.
A pond slurry pump moved lagoon biosolids to the receiving manifold for controlled transfer into the treatment system.
The biosolids were pumped to centrifuges while polymer was injected at the feed pump to bind fine particles and improve liquid-solid separation.
Dewatered solids discharged from the centrifuges into a shale bin for staging.
Separated water moved through the BOS III tank for reuse and polymer mixing before it was circulated back to the lagoon.
When the bin was full, a loader transferred the dry material to an end-dump truck for removal to disposal.
The patented clear-water-loop dewatering system and centrifuges turned the lagoon biosolids into a dry, stackable waste and clean water that went back into the lagoon. A dry waste that is easy to dispose of cut the cost of standard disposal trucks and reduced the project's carbon footprint.