Process for recovering regenerated adsorbent particles and separ

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

1987-07-06

1988-06-07

Cintins, Ivars

Liquid purification or separation

Processes

Treatment by living organism

209 5, 210673, 210675, 210694, 210713, 210727, 210804, 210805, B03D 306, C02F 308, C02F 128

Patent

active

047494921

ABSTRACT:
Regenerated adsorbent particles, such as activated carbon, are recovered from a wet oxidation-regenerated mixed liquor sludge 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 The first aqueous phase is combined with a portion of the regenerated adsorbent particle slurry withdrawn from the upper portion of the wet oxidation reactor and, after treatment with a dispersing agent and then an anionic flocculating agent, the resulting mixture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.

REFERENCES:
patent: 3876536 (1975-04-01), Pradt et al.
patent: 3904518 (1975-09-01), Hutton et al.
patent: 4069148 (1978-01-01), Hutton et al.
patent: 4541933 (1985-09-01), Armold et al.
patent: 4555329 (1985-11-01), Sykes et al.

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