Integrating anaerobic digestion and pyrolysis for treating digestates derived from sewage sludge and fat wastes
The coupling of biological and thermal technologies allows for the complete conversion of wastes into energy and biochar eliminating the problem of sludge disposal. The valorisation of fatty residues as co-substrate in a mesophilic digester of a wastewater treatment plant was studied considering an integrated approach of co-digestion and pyrolysis. Four digested samples obtained from co-digestion of sewage sludge and butcher’s fat waste were studied by thermogravimetric analysis. The activation energy corresponding to the sludge pyrolysis was calculated by a non-isothermal kinetic. Arrhenius activation energy was lower for the pyrolysis of a digested grease sample (92 kJ mol obtained by OFW and 86 kJ mol obtained by Vyazovkin) than for the pyrolysis of sewage sludge and its blends (164–190 kJ mol obtained by OFW and 162–190 kJ mol obtained by Vyazovkin). The analysis of the integrated approach of anaerobic co-digestion and pyrolysis of digestates demonstrated that the addition of 3% (w/v) of fat to the feeding sludge results in a 25% increase in the electricity obtained from biogas (if a combined heat and power unit is considered for biogas valorisation) and increasing the fat content to 15% allows for covering all thermal needs for drying of digestate and more than doubles (2.4 times) the electricity production when the scenario of digestion and pyrolysis is contemplated.
Main Authors: | González-Arias, Judith, Gil Matellanes, María Victoria, Fernández, Ramón Ángel, Martínez, Elia Judith, Fernández, Camino, Papaharalabos, George, Gómez, Xiomar |
---|---|
Other Authors: | Ministerio de Economía y Competitividad (España) |
Format: | artículo biblioteca |
Published: |
Springer Nature
2020
|
Subjects: | Butcher’s fat waste, Thermal analysis, Kinetics, Energy balance, Heat integration, Process efficiency, |
Online Access: | http://hdl.handle.net/10261/234490 http://dx.doi.org/10.13039/501100003329 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Knowing your trees / [et. al.]
by: Collingwood, G. H.
Published: (1978) -
Kinetics of thermal and high-pressure inactivation of avocado polygalacturonase
by: Bermejo-Prada, Ana, et al.
Published: (2014) -
Kinetic Analysis of the Thermal Degradation of Recycled Acrylonitrile-Butadiene-Styrene by non-Isothermal Thermogravimetry
by: Balart, Rafael, et al.
Published: (2019-02-07) -
Rheometric non-isothermal gelatinization kinetics of chickpea flour-based gluten-free muffin batters
with Added Biopolymers
by: Álvarez, M. Dolores, et al.
Published: (2017) -
Thermal degradation of green asparagus texture
by: Rodrigo, Carmen, et al.
Published: (1997-03-01)