Enhancing the methane potential of the liquor obtained from enzymatic pre-treatment of sewage sludge by the addition of glycerin

  1. Negral Álvarez, Luis
  2. Marañón Maison, María Elena
  3. Castrillón Peláez, Leonor
  4. Fernández Nava, Yolanda
  5. Ormaechea Menéndez, Pedro
Actas:
17th European Biosolids and Organic Resources Conference: Portugal, del 23 al 25 de mayo de 2013

Año de publicación: 2013

Tipo: Aportación congreso

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Resumen

Inverted Phase Fermentation is a method for thickening sewage sludge that results in a clarified phase beneath a thickened fraction. An increased hydrolysis rate is obtained in both phases. The liquid phase or liquor was digested in UASB reactors. The optimum methane yield was obtained for hydraulic retention time of 1 day (0.32 m3 CH4/kg VS, 2.31 m3 CH4/m3reactor day). When this liquor was co-digested with 1% (v/v) crude glycerin, the optimum methane yield was obtained when operating at hydraulic retention time of 2 days (0.67 m3 CH4/kg VS, 2.76 m3CH4/m3reactor day). Co-digestion of the liquor with crude glycerin not only improved specific methane yield, but also organic matter biodegradation (up to 89% total COD and up to 76% VS removal).