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Aerobic granulation in a mechanical stirred SBR: treatment of low organic loads.

Authors
  • Mosquera-Corral, A
  • Arrojo, B
  • Figueroa, M
  • Campos, J L
  • Méndez, R
Type
Published Article
Journal
Water science and technology : a journal of the International Association on Water Pollution Research
Publication Date
Jan 01, 2011
Volume
64
Issue
1
Pages
155–161
Identifiers
PMID: 22053470
Source
Medline
License
Unknown

Abstract

Aerobic granular sludge was produced in a sequencing batch reactor (SBR) characterized by a height to diameter ratio of 2.5 and the use of mechanical stirring. Compact and regular aerobic granules of up to 1.75 mm of average diameter were formed in the reactor with an organic loading rate of 1.75 kg COD/(m3 d). Settling properties of the obtained aggregates were: sludge volumetric index of 30-40 mL/g VSS and settling velocity higher than 8 m/h. The effects of different carbon to nitrogen ratios (TOC/N) in the feeding on the organic matter oxidation and nitrification process were studied. The concentration of organic matter in the feeding was stepwise reduced (from 190.0 to 37.5 mg TOC/L) and ammonium increased (from 25 to 50 mg NH4+ -N/L). TOC/N ratios of 7.50, 3.00, 1.50 and 0.75 g/g in the feeding were tested. The TOC removal percentage was around 80-95% during the whole operational period and the N removal percentages obtained in the reactor were up to 40%, however, physical properties of the granules were not maintained.

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