• To demonstrate the technical-economic viability of high-solids anaerobic digestion technology as an alternative in small to medium size WWTPs.
  • To increase sludge stabilization (i.e. Volatile Solids in the effluent between 40-60%).
  • To reduce transport costs by 30% approximately, and therefore environmental impact due to transportation, for example CO2 emissions. It has been considered that 0,225 kg CO2/km will be avoided.
  • To improve the quality of the sludge produced (i.e to reduce pathogen content). It is expected a reduction between 50-99% of pathogens.
  • To reduce 80% of reactor volume comparing to conventional wet digestion. A compact digester with higher volumetric organic loading rate would be used, and consequently less consumption of material resources will be necessary.
  • To reduce greenhouse gas emissions in sludge storage tanks due to the reduction of quantities of sludge generated and the process applied.
  • To increase resource recovery from organic matter as green energy: the biogas produced contributes to the energy self-sufficiency of wastewater treatment plants. At the same time, there is a reduction of fossil fuel consumption regarding the initial situation of this type of WWTPs without sludge stabilization.
  • To promote the inorganic fertilizers substitution (by 70% approximately) due to the use of recycled sludge in agriculture and reduction of carbon emissions associated to its use in agriculture.


"This project has received funding from the European financial instrument for the Environment (Life+) programme (LIFE14 ENV/ES/000524). The European Comission is neither responsible nor liable for any written content in this website"

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