An option would be to have ...
Published by Gerd Teunissen, technical director at INTERAGUA, Lda.
An option would be to have utility owned or private mobile dewatering units for excess activated sludge for servicing smaller WWTP's. Some types have a pre-thickening function incorporated and can run directly from the return sludge flow. That way you concentrate to 18 - 20% DS and reduce the total weight and volume by a factor 7 to 10 already on site. If regulations allow, this dewatered sludge can be applied in local agriculture. Many farmers will pick it up for free.
(We were operating a WWTP where the operator would put his own small trailer below the decanter centrifuge outlet.)