Artículo

Influence of conditioning agents and enzymic hydrolysis on the biochemical methane potential of sewage sludge

  • Elena Marañón /
  • Luis Negral /
  • Yolanda Fernández-Nava /
  • Leonor Castrillón
Journal ar
Water Science and Technology
  • Volumen: 68
  • Número: 7
  • Fecha: 18 noviembre 2013
  • Páginas: 1622-1632
  • ISSN: 02731223
  • Tipo de fuente: Revista
  • DOI: 10.2166/wst.2013.413
  • Tipo de documento: Artículo
Biochemical methane potential (BMP) tests have been carried out on sewage sludge from two wastewater treatment plants to assess the effect of additives (FeCl3and two cationic polyelectrolytes) used in sludge dewatering. BMP tests were also carried out on the concentrated solid phase from the enzymic hydrolysis pre-treatment (42 °C, 48 h). FeCl3had no significant effect on specific methane production, obtaining 242-246 LCH4/ kgVSo. The effect of the combination of polyelectrolyte and FeCl 3depended on the polyelectrolyte and the sludge, but generally led to an increase in specific methane production (25-40%). When enzymic hydrolysis was applied as a pretreatment, specific methane production increased from 6.8% in the sludge containing FeCl3to 20% in the sludge without FeCl 3, although the increases were not statistically significant. In terms of LCH4/kgVSrem, a general improvement was achieved both by means of additives and by enzymic hydrolysis. However, this improvement was only significant in the case of sludge which had undergone previous enzymic hydrolysis (62%) and in the untreated sludge containing a polyelectrolyte and FeCl3(24%). Cationic polyelectrolytes inhibited solid-liquid separation during enzymic hydrolysis and, although the presence of only FeCl3did not affect this separation, a significant decrease (32%) in LCH4/kgVSremwas observed. © IWA Publishing 2013.

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