Zimpro Inc.

Marvin J Dietrich

Mark C Hoffman

Thomas P Oettinger

A process for separating ash particles from an aqueous slurry containing a mixture of regenerated adsorbent (e.g., carbon) and ash particles includes the steps of settling the slurry to produce a solid phase including the mixture of adsorbent and ash particles and a supernatant or a clarified aqueous phase. After separation of the aqueous phase, a slurry of the solid phase is diluted with water and a dispersing agent for promoting suspension of the ash particles and an anionic polymer for promoting settling of the adsorbent particles are added. The thus-treated, dilute slurry is settled to produce an aqueous phase containing primarily suspended ash particles and a solid phase including carbon particles. After separation, the solid phase can be returned to a wastewater treatment system.

Separation of ash from regenerated adsorbent

Suspended ash in wastewater is efficiently concentrated and removed by mixing the ash suspension with thermally conditioned sludge. The solids in the resulting ash/sludge mixture are easily settled and dewatered by conventional means.

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Schofield, WI, United States of America

Marvin J Dietrich