Use of Quality Six Sigma Tools to Optimize Sludge Dewatering by Centrifugation

The solid bowl centrifuge has emerged as a dewatering machine of choice in many treatment plants processing biological or mixed sludges. The high G forces promote the formation of highly compacted, dry sludge cake. Other advantages include a small footprint, and an enclosed system that reduces odor. The operating costs include maintenance of a precision-balanced high speed machine, cost of electrical power, and flocculant aids (polymers). This paper will demonstrate how Quality tools from the Six Sigma body of knowledge can be employed to optimize overall sludge processing costs when using a centrifuge. Perhaps many operating centrifuges could increase reliability and reduce overall costs by 25% or more, using these techniques!