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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Solar Sludge Drying Technology and Dried Sludge as Renewable Energy—Closing the Loop
Author(s)
Osvaldo Garanto
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DOI:10.17265/2328-2142/2016.04.005
Affiliation(s)
PESA MEDIOAMBIENTE SAU., (formerly named Passavant España SA), Sant Cugat del Vallès 08174, Spain
ABSTRACT
The biggest problem in
wastewater treatment is what can be done with the sewage sludge. Generally,
there are few possibilities to manage it such as landfill, incineration or use
it as a fertiliser in agriculture with limited amount. Nowadays, there is a
simple technology that allows a very costly effective transformation from
dewatered sewage sludge into a renewable energy resource. Sewage sludge
contains water mostly which can be reduced by common dewatering processes until
a DS (dry solids)
concentration to about 25%. In this condition, the sludge can be incinerated, but the energy that
can be obtained from the burning may be equal to the required one to evaporate
the accompanying water. So, another reduction on water content is required
until the mass contains 90% DS under which the calorific value will be
increased to about 10 MJ/kg. Then, the sewage sludge can be considered as a
clear substitute for coal with the advantage of a renewable and carbon dioxide
neutral CO2 emissions.
KEYWORDS
Sewage sludge, sludge thermal drying, renewable energy, neutral carbon dioxide, alternative fuels, saturated steam cycle.
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