Skip to main content
main-content

Tipp

Weitere Artikel dieser Ausgabe durch Wischen aufrufen

04.06.2016 | LCA OF WASTE MANAGEMENT SYSTEMS | Ausgabe 12/2016

The International Journal of Life Cycle Assessment 12/2016

Teaching life cycle assessment in environmental engineering: a disinfection case study for students

Zeitschrift:
The International Journal of Life Cycle Assessment > Ausgabe 12/2016
Autor:
Kevin R. Gilmore
Wichtige Hinweise
Responsible editor: Greg Thoma

Electronic supplementary material

The online version of this article (doi:10.​1007/​s11367-016-1138-1) contains supplementary material, which is available to authorized users.

Abstract

Purpose

To help educators increase the extent and effectiveness of integrating sustainability into undergraduate education, a case study in life cycle assessment (LCA) is developed and presented using the context of disinfection of wastewater.

Methods

Design and operating parameters are presented for three alternatives: chlorine/sulfur dioxide, ultraviolet (UV) light, and sodium hypochlorite/sodium sulfite. The case study includes student learning objectives, design assumptions, system boundaries, supporting calculation files, descriptions of LCA simulation scenarios, expected simulation results, and interpretation. LCA simulations, using the ISO methodology approach, are performed with varying assumptions about design flows, study duration, electricity fuel mixes, an alternative LCIA methodology, and weighting scenarios. Results are presented primarily at the midpoint level, and the effects of weighting are illustrated using a ternary plot. Life cycle costing is performed by calculating net present worth cost of construction materials and selected ongoing operation and maintenance costs.

Results and discussion

After interpreting simulation results, students should be able understand and apply several LCA skills including identifying significant impact categories, describing tradeoffs between different life stages, identifying “hot-spots” in the life cycles, illustrating the impacts and limitations of weighting, and observing differences across LCIA methodologies. Using the assumptions herein, chlorine disinfection results in larger initial impacts due to the larger basin required for hydraulic retention time (HRT), but operating impacts associated with electricity consumption cause the UV impacts to overtake those of the chlorine alternative. The results are sensitive to the LCIA method, the electricity grid’s fuel mix, and the electricity consumed per unit of wastewater disinfected. Finally, consideration of non-environmental and non-cost factors (risk, safety) provide students with an opportunity to reflect on broader societal impacts.

Conclusions

Adaptable for various audiences and to provide differing levels of technical rigor, the case study should aid students in understanding and becoming proficient in performing LCA to facilitate life cycle thinking. It is the author’s hope that by providing a transparent, comprehensive LCA case study comparing engineering alternatives, educators can better integrate life cycle thinking and systems thinking into engineering curricula.

Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten

Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

  • über 69.000 Bücher
  • über 500 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Umwelt
  • Finance + Banking
  • Management + Führung
  • Marketing + Vertrieb
  • Maschinenbau + Werkstoffe

Testen Sie jetzt 30 Tage kostenlos.

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

  • über 50.000 Bücher
  • über 380 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Umwelt
  • Maschinenbau + Werkstoffe​​​​​​​




Testen Sie jetzt 30 Tage kostenlos.

Zusatzmaterial
ESM 1 (DOCX 28 kb)
11367_2016_1138_MOESM1_ESM.docx
ESM 2 (XLSX 184 kb)
11367_2016_1138_MOESM2_ESM.xlsx
ESM 3 (PDF 233 kb)
11367_2016_1138_MOESM3_ESM.pdf
Literatur
Über diesen Artikel

Weitere Artikel der Ausgabe 12/2016

The International Journal of Life Cycle Assessment 12/2016 Zur Ausgabe

CORNER: UNEP/SETAC LIFE CYCLE INITIATIVE

Status update on LCA studies and networking in Tanzania