RT journal article
T1 Seeking to enhance the bioenergy of municipal sludge: Effect of alkali pre-treatment and soluble organic matter supplementation
A1 Zahedi, S.
A1 Rivero, M.
A1 Solera del Río, María del Rosario
A1 Pérez García, Montserrat
A2 Tecnologías del Medio Ambiente
K1 Anaerobic digestion
K1 Bioenergy
K1 Pre-treatment
K1 Mesophilic
K1 Sewage sludge
K1 Glycerine
AB The aim of this research is to enhance the mesophilic anaerobic digestion of municipal sludge fromCadiz-San Fernando (Spain) wastewater treatment plant at 20 days hydraulic retention time (HRT). Twodifferent strategies were tested to improve the process: co-digestion with the addition of soluble organicmatter (1% v/v); and alkali sludge pre-treatment (NaOH) prior to co-digestion with glycerine (1% v/v).Methane production (MP) was substantially enhanced (from 0.36 ± 0.09 L CH4 l/d to 0.85 ± 0.16 L CH4l/d), as was specific methane production (SMP) (from 0.20 ± 0.05 L CH4/g VS to 0.49 ± 0.09 L CH4/g VS)when glycerine was added. The addition of glycerine does not seem to affect sludge stability, thequality of the effluent in terms of pH and organic matter content, i.e. volatile fatty acids (VFA), solubleorganic matter and total volatile solid, or process stability (VFA/Alkalinity ratio < 0.4). Alkalipre-treatment prior to co-digestion resulted in a high increase in soluble organic loading rates (more than20%) and acidification yield (more than 50%). At 20 days HRT, however, it led to overload of the system and total destabilization of the mesophilic anaerobic co-digestion of sewage sludge and glycerine.
PB ELSEVIER
SN 956-053X
YR 2017
FD 2017
LK http://hdl.handle.net/10498/22443
UL http://hdl.handle.net/10498/22443
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026