Artículo

Differences in soluble COD and ammonium when applying ultrasound to primary, secondary and mixed sludge

  • L. Negral /
  • E. Marañón /
  • L. Castrillón /
  • Y. Fernández-Nava
Journal ar
Water Science and Technology
  • Volumen: 71
  • Número: 9
  • Fecha: 01 enero 2015
  • Páginas: 1398-1406
  • ISSN: 02731223
  • Tipo de fuente: Revista
  • DOI: 10.2166/wst.2015.113
  • Tipo de documento: Artículo
  • Editorial: IWA Publishing 12 Caxton Street London SW1H 0QS
© IWA Publishing 2015. Ultrasound treatment is often applied to enhance the anaerobic digestion of sludge. Optimal conditions for organic matter solubilisation of primary, secondary and mixed sludge were assessed by implementing ultrasound disruption at different specific energies (from 3,500 to 21,000 kJ/kgTS). The variation in soluble chemical oxygen demand (sCOD) and ammonium nitrogen (Formula presented.) was monitored following the treatment, and after a subsequent fermentation (24 h, 37 °C). The effect of the treatment was clearly more pronounced in secondary sludge than in the other types of sludge. Relatively minimal values in solubility were found when applying ultrasound at different energies depending on the sludge (3,500-7,000 kJ/kgTS in primary sludge and 10,500-14,000 kJ/kgTS in secondary sludge). This minimal value was not so noticeable in mixed sludge. The addition of inoculum was not required after ultrasound disruption in order to perform the subsequent fermentation. After this final stage, no general pattern in terms of sCOD was observed. Increases and decreases were conditioned by the coverage of the ultrasound irradiation; (Formula presented.) values increased notably during the fermentation.

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