Process for recovering regenerated adsorbent particles and...

Details Process for recovering regenerated adsorbent particles and... Process for recovering regenerated adsorbent particles and...

B - Operations, Transporting

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B01J 20/34 (2006.01) B03D 3/06 (2006.01) C02F 1/28 (2006.01) C02F 11/08 (2006.01) C02F 11/14 (2006.01)

Patent

CA 1310950

ABSTRACT OF THE DISCLOSURE Regenerated adsorbent particles, such as activated carbon, are recovered from a wet oxidation-regenerated mixed sludge liquor from a wastewater treatment system by diluting and settling a blowdown slurry from the wet oxidation reactor to obtain a first aqueous phase containing primarily regenerated adsorbent particles and fine ash particles and a first solids phase containing primarily grit particles. The first aqueous phase is - combined with a portion of the regenerated adsorbent particle slurry withdrawn from the upper portion of the wet oxidation reactor and, after treatment with a dispersing agent and then an anionic flocculating agent, the resulting mixture is settled to obtain a second aqueous phase containing primarily fine ash particles and a second solids phase containing primarily regenerated adsorbent particles. The second solids phase is recycled to the treatment system for reuse and, after treatment with a cationic flocculating agent, the second aqueous phase is settled to obtain a substantially particle-free third aqueous phase and a third solids phase containing primarily fine ash particles. Slurries containing the grit and fine ash particles are combined and dewatered prior to disposal. Docket: 99037/9098-6

560871

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