A hybrid life cycle assessment of water treatment chemicals: an Australian experience
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Life cycle assessment (LCA) of chemicals is usually developed using a process-based approach. In this paper, we develop a tiered hybrid LCA of water treatment chemicals combining the specificity of process data with the holistic nature of input–output analysis (IOA). We compare these results with process and input–output models for the most commonly used chemicals in the Australian water industry to identify the direct and indirect environmental impacts associated with the manufacturing of these materials.
We have improved a previous Australian hybrid LCA model by updating the environmental indicators and expanding the number of included industry sectors of the economy. We also present an alternative way to estimate the expenditure vectors to the service sectors of the economy when financial data are not available. Process-based, input–output and hybrid results were calculated for caustic soda, sodium hypochlorite, ferric chloride, aluminium sulphate, fluorosilicic acid, calcium oxide and chlorine gas. The functional unit is the same for each chemical: the production of 1 tonne in the year 2008.
Results and discussion
We have provided results for seven impact categories: global warming potential; primary energy; water use; marine, freshwater and terrestrial ecotoxicity potentials and human toxicity potential. Results are compared with previous IOA and hybrid studies. A sensitivity analysis of the results to assumed wholesale prices is included. We also present insights regarding how hybrid modelling helps to overcome the limitations of using IO- or process-based modelling individually.
Conclusions and recommendations
The advantages of using hybrid modelling have been demonstrated for water treatment chemicals by expanding the boundaries of process-based modelling and also by reducing the sensitivity of IOA to fluctuations in prices of raw materials used for the production of these industrial commodities. The development of robust hybrid life cycle inventory databases is paramount if hybrid modelling is to become a standard practice in attributional LCA.
KeywordsEIO-LCA Hybrid LCA Price sensitivity Process LCA Water treatment chemicals
- Australian Bureau of Statistics (ABS) (2011a) 4604.0—energy account, Australia, 2009–10. http://www.abs.gov.au/AUSSTATS/abs@nsf/mf/46040. Accessed 7 Aug 2012
- Australian Bureau of Statistics (ABS) (2011b) 5209.0.55.001—Australian national accounts: input–output tables—electronic publication, 2007–08. http://www.abs.gov.au/ausstats/abs@nsf/mf/5209055001. Accessed 7 Aug 2012
- Australian Bureau of Statistics (ABS) (2011c) Producer price indexes. http://www.abs.gov.au/AUSSTATS/abs@nsf/Lookup/64270Main+Features1Jun%202012?OpenDocument. Accessed 10 Aug 2012
- Australian Bureau of Statistics (ABS) (2012) 4610.0—water account, Australia, 2008–09. http://www.abs.gov.au/AUSSTATS/abs@nsf/allprimarymainfeatures/5AE274ABA08B9C07CA257956000E6962?opendocument. Accessed 7 Mar 2012
- Australian Greenhouse Emissions Information System (AGEIS) (2012) National inventory by economic sector. http://ageis.climatechange.gov.au/. Accessed 20 Aug 2012
- Alvarez-Gaitan JP, Schulz M, Peters G (2011) Sustainability of water and wastewater treatment chemicals: development of Australian life cycle inventory data. Proceedings of the 7th Australian life cycle assessment conference—revealing the secrets of a green market, Melbourne, 9–10 March 2011Google Scholar
- Carnegie Mellon University Green Design Institute (2012) Economic Input–Output Life Cycle Assessment (EIO-LCA), US 2002 Industry Benchmark model [Internet]. http://www.eiolca.net. Accessed 30 Jul 2012
- Department of Sustainability, Environment, Water, Population and Communities (DSEWPC) (2011) NPI facility data 2007/2008. http://www.npi.gov.au/. Accessed 20 Sep 2011
- European Integrated Pollution Prevention and Control Bureau (EIPPCB) (2011) Reference document on best available techniques in the chlor-alkali manufacturing industry. http://eippcb.jrc.es/reference/. Accessed 16 Mar 2012
- Foran et al (2005) Balancing act: a triple bottom line analysis of the Australian economy. CSIRO. http://www.csiro.au/Outcomes/Environment/Population-Sustainability/BalancingActaspx. Accessed 23 Mar 2012
- Friedrich E (2002) Life-cycle assessment as an environmental management tool in the production of potable water. Water Sci Technol 46(9):29–36Google Scholar
- Intergovernmental Panel on Climate Change (IPCC) (1995) Second assessment report. http://www.ipcc.ch/publications_and_data/publications_and_data_reportsshtml#UHYyDFGcSSo. Accessed 13 Sep 2012
- Kounina A, Margni M, Bayart J-B, Boulay A-M, Berger M, Bulle C, Frischknecht R, Koehler A, Milà i Canals L, Motoshita M, Núñez M, Peters G, Pfister S, Ridoutt B, Zelm R, Verones F, Humbert S (2013) Review of methods addressing freshwater use in life cycle inventory and impact assessment. Int J Life Cycle Assess 18(3):707–721CrossRefGoogle Scholar
- Lenzen M, Murray J (2009) Pain-free scope 3, input into Greenhouse Gas Protocol Technical Working Group discussion on sectoral value chain mapping of emissions by purchasing categories. Centre for Integrated Sustainability Analysis, The University of Sydney, AustraliaGoogle Scholar
- Lundie S, Bligh M, Feitz A, Huijbregts M, Peters G, Helyar K, Dimova C (2001) Australian life cycle impact assessment final report. CRC Project 04–6003, Centre for Water and Waste Technology, University of New South WalesGoogle Scholar
- Mohapatra PK, Siebel MA, Gijzen HJ, Van der Hoek JP, Groot CA (2002) Improving eco-efficiency of Amsterdam water supply: a LCA approach. J Water SRT - Aqua 51 (Compendex):217–227Google Scholar
- National Water Commission (NWC) (2009) Water and the electricity generation industry: implications of use. http://nwc.gov.au/__data/assets/pdf_file/0010/10432/Waterlines_electricity_generation_industry_replace_final_280709pdf. Accessed 17 Aug 2012
- Organisation for Economic Co-operation and Development (OECD) (2011) 40 years of chemical safety at the OECD: quality and efficiency. http://www.oecd.org/env/chemicalsafetyandbiosafety/48153344pdf. Accessed 1 Sep 2012
- Plastics and Chemicals Industries Association (PACIA) (2011) Annual report. http://www.pacia.org.au/. Accessed 13 Mar 2012
- PE International (2012) GaBi 5 softwareGoogle Scholar
- United States Geological Survey (USGS) (2011) Historical statistics for mineral and material commodities in the United States. http://minerals.usgs.gov/ds/2005/140/. Accessed 20 Aug 2012
- Weidema B (2011) Steps toward a global hybrid database. International Society for Industrial Ecology (ISIE) meeting, BerkeleyGoogle Scholar
- Water Research Foundation (WRF) (2009) Supply of critical drinking water and wastewater treatment chemicals—a white paper for understanding recent chemical price increases and shortages. http://www.waterrf.org/Pages/Projectsaspx?PID=4225. Accessed 23 Apr 2012