Next Article in Journal
Evaluation of Lime-Treated Lateritic Soil for Reservoir Shoreline Stabilization
Previous Article in Journal
Innovative Multistage Constructed Wetland for Municipal Wastewater Treatment and Reuse for Agriculture in Senegal
Previous Article in Special Issue
Impact of Nanoscale Magnetite and Zero Valent Iron on the Batch-Wise Anaerobic Co-Digestion of Food Waste and Waste-Activated Sludge
Article

Life Cycle Assessment of the Mesophilic, Thermophilic, and Temperature-Phased Anaerobic Digestion of Sewage Sludge

1
GEMMA—Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya·BarcelonaTech, c/Jordi Girona 1–3, Building D1, 08034 Barcelona, Spain
2
Department of Water Technology and Environmental Engineering, University of Chemistry and Technology, Technicka, 5, 166 28 Prague, Czech Republic
3
Veolia Česká Republika, a.s., Na Florenci 2116/15, Reception D, 110 00 Prague, Czech Republic
4
Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands
*
Authors to whom correspondence should be addressed.
Water 2020, 12(11), 3140; https://doi.org/10.3390/w12113140
Received: 18 August 2020 / Revised: 2 November 2020 / Accepted: 3 November 2020 / Published: 10 November 2020
In this study the environmental impact of the anaerobic digestion (AD) of sewage sludge within an activated sludge wastewater treatment plant (WWTP) was investigated. Three alternative AD systems (mesophilic, thermophilic, and temperature-phased anaerobic digestion (TPAD)) were compared to determine which system may have the best environmental performance. Two life cycle assessments (LCA) were performed considering: (i) the whole WWTP (for a functional unit (FU) of 1 m3 of treated wastewater), and (ii) the sludge line (SL) alone (for FU of 1 m3 of produced methane). The data for the LCA were obtained from previous laboratory experimental work in combination with full-scale WWTP and literature. According to the results, the WWTP with TPAD outperforms those with mesophilic and thermophilic AD in most analyzed impact categories (i.e., Human toxicity, Ionizing radiation, Metal and Fossil depletion, Agricultural land occupation, Terrestrial acidification, Freshwater eutrophication, and Ozone depletion), except for Climate change where the WWTP with mesophilic AD performed better than with TPAD by 7%. In the case of the SL alone, the production of heat and electricity (here accounted for as avoided environmental impacts) led to credits in most of the analyzed impact categories except for Human toxicity where credits did not balance out the impacts caused by the wastewater treatment system. The best AD alternative was thermophilic concerning all environmental impact categories, besides Climate change and Human toxicity. Differences between both LCA results may be attributed to the FU. View Full-Text
Keywords: anaerobic digestion (AD); biogas; life cycle assessment (LCA); methane; waste activated sludge (WAS); wastewater treatment plant (WWTP) anaerobic digestion (AD); biogas; life cycle assessment (LCA); methane; waste activated sludge (WAS); wastewater treatment plant (WWTP)
Show Figures

Figure 1

MDPI and ACS Style

Lanko, I.; Flores, L.; Garfí, M.; Todt, V.; Posada, J.A.; Jenicek, P.; Ferrer, I. Life Cycle Assessment of the Mesophilic, Thermophilic, and Temperature-Phased Anaerobic Digestion of Sewage Sludge. Water 2020, 12, 3140. https://doi.org/10.3390/w12113140

AMA Style

Lanko I, Flores L, Garfí M, Todt V, Posada JA, Jenicek P, Ferrer I. Life Cycle Assessment of the Mesophilic, Thermophilic, and Temperature-Phased Anaerobic Digestion of Sewage Sludge. Water. 2020; 12(11):3140. https://doi.org/10.3390/w12113140

Chicago/Turabian Style

Lanko, Iryna, Laura Flores, Marianna Garfí, Vladimir Todt, John A. Posada, Pavel Jenicek, and Ivet Ferrer. 2020. "Life Cycle Assessment of the Mesophilic, Thermophilic, and Temperature-Phased Anaerobic Digestion of Sewage Sludge" Water 12, no. 11: 3140. https://doi.org/10.3390/w12113140

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop