2022, Volume 14, Issue 7
Engineering >> 2022, Volume 14, Issue 7 doi: 10.1016/j.eng.2022.04.012
Toward Carbon-Neutral Water Systems: Insights from Global Cities
a Division of Natural and Applied Sciences, Duke Kunshan University, 8 Duke Avenue, Kunshan 215316, China
b Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
c Waternet, Amsterdam 1096 AC, Netherlands
d Department of Water Management, Delft University of Technology, Delft 2628 CN, Netherlands
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Abstract
Many cities have pledged to achieve carbon neutrality. The urban water industry can also contribute its share to a carbon-neutral future. Using a multi-city time-series analysis approach, this study aims to assess the progress and lessons learned from the greenhouse gas (GHG) emissions management of urban water systems in four global cities: Amsterdam, Melbourne, New York City, and Tokyo. These cities are advanced in setting GHG emissions reduction targets and reporting GHG emissions in their water industries. All four cities have reduced the GHG emissions in their water industries, compared with those from more than a decade ago (i.e., the latest three-year moving averages are 13%–32% lower), although the emissions have "rebounded" multiple times over the years. The emissions reductions were mainly due to various engineering opportunities such as solar and mini-hydro power generation, biogas valorization, sludge digestion and incineration optimization, and aeration system optimization. These cities have recognized the many challenges in reaching carbon-neutrality goals, which include fluctuating water demand and rainfall, more carbon-intensive flood-prevention and water-supply strategies, meeting new air and water quality standards, and revising GHG emissions accounting methods. This study has also shown that it is difficult for the water industry to achieve carbon neutrality on its own. A collaborative approach with other sectors is needed when aiming toward the city's carbon-neutrality goal. Such an approach involves expanding the usual system boundary of the water industry to externally tap into both engineering and non-engineering opportunities.
Keywords
Urban water ; Greenhouse gas emissions ; Cities ; Climate change mitigation ; Carbon neutrality
SupplementaryMaterials
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References
[ 1 ] Wiedmann T, Chen G, Owen A, Lenzen M, Doust M, Barrett J, et al. Three-scope carbon emission inventories of global cities. J Ind Ecol 2021;25(3):735–50. link1
[ 2 ] Our cities [Internet]. Washington: Carbon Neutral Cities Alliance; c2021 [cited 2022 Apr 16]. Available online: https://carbonneutralcities.org/cities/. link1
[ 3 ] Ballard S, Porro J, Trommsdorff C. The roadmap to a low-carbon urban water utility: an international guide to the WaCCliM approach. London: IWA Publishing; 2018. link1
[ 4 ] Liu G, Qu J, van Loosdrecht M. ‘Blue Route’ for combating climate change. Natl Sci Rev 2021;8(8):nwab099. link1
[ 5 ] Rothausen SGSA, Conway D. Greenhouse-gas emissions from energy use in the water sector. Nat Clim Chang 2011;1(4):210–9. link1
[ 6 ] Chini CM, Excell LE, Stillwell AS. A review of energy-for-water data in energy– water nexus publications. Environ Res Lett 2021;15(12):123011. link1
[ 7 ] Chisholm A. A blueprint for carbon emissions reductions in the UK water industry. Report. London: The Chartered Institution of Water and Environmental Management; 2013. link1
[ 8 ] Strazzabosco A, Kenway SJ, Lant PA. Solar PV adoption in wastewater treatment plants: a review of practice in California. J Environ Manage 2019;248:109337. link1
[ 9 ] Strazzabosco A, Kenway SJ, Conrad SA, Lant PA. Renewable electricity generation in the Australian water industry: lessons learned and challenges for the future. Renew Sustain Energy Rev 2021;147:111236. link1
[10] Cao Y, Pawłowski A. Sewage sludge-to-energy approaches based on anaerobic digestion and pyrolysis: brief overview and energy efficiency assessment. Renew Sustain Energy Rev 2012;16(3):1657–65. link1
[11] Jacob R, Short M, Belusko M, Bruno F. Maximising renewable gas export opportunities at wastewater treatment plants through the integration of alternate energy generation and storage options. Sci Total Environ 2020;742:140580. link1
[12] McCarty PL, Bae J, Kim J. Domestic wastewater treatment as a net energy producer—can this be achieved? Environ Sci Technol 2011;45(17):7100–6. link1
[13] Mo W, Zhang Q. Can municipal wastewater treatment systems be carbon neutral? J Environ Manage 2012;112:360–7. link1
[14] Hao X, Li J, van Loosdrecht MCM, Jiang H, Liu R. Energy recovery from wastewater: heat over organics. Water Res 2019;161:74–7. link1
[15] Gu Y, Li Y, Li X, Luo P, Wang H, Robinson ZP, et al. The feasibility and challenges of energy self-sufficient wastewater treatment plants. Appl Energy 2017;204:1463–75. link1
[16] Law Y, Jacobsen GE, Smith AM, Yuan Z, Lant P. Fossil organic carbon in wastewater and its fate in treatment plants. Water Res 2013;47(14):5270–81. link1
[17] Daelman MRJ, van Voorthuizen EM, van Dongen UGJM, Volcke EIP, van Loosdrecht MCM. Methane emission during municipal wastewater treatment. Water Res 2012;46(11):3657–70. link1
[18] Law Y, Ye L, Pan Y, Yuan Z. Nitrous oxide emissions from wastewater treatment processes. Philos Trans R Soc Lond B Biol Sci 2012;367 (1593):1265–77. link1
[19] Wu L, Chen X, Wei W, Liu Y, Wang D, Ni BJ. A critical review on nitrous oxide production by ammonia-oxidizing Archaea. Environ Sci Technol 2020;54 (15):9175–90. link1
[20] Daelman MRJ, de Baets B, van Loosdrecht MCM, Volcke EIP. Influence of sampling strategies on the estimated nitrous oxide emission from wastewater treatment plants. Water Res 2013;47(9):3120–30. link1
[21] Massara TM, Malamis S, Guisasola A, Baeza JA, Noutsopoulos C, Katsou E. A review on nitrous oxide (N2O) emissions during biological nutrient removal from municipal wastewater and sludge reject water. Sci Total Environ 2017;596–597:106–23. link1
[22] Chen X, Mielczarek AT, Habicht K, Andersen MH, Thornberg D, Sin G. Assessment of full-scale N2O emission characteristics and testing of control concepts in an activated sludge wastewater treatment plant with alternating aerobic and anoxic phases. Environ Sci Technol 2019;53(21):12485–94. link1
[23] Wu L, Mao XQ, Zeng A. Carbon footprint accounting in support of city water supply infrastructure siting decision making: a case study in Ningbo. China J Clean Prod 2015;103:737–46. link1
[24] Zhang Q, Nakatani J, Wang T, Chai C, Moriguchi Y. Hidden greenhouse gas emissions for water utilities in China’s cities. J Clean Prod 2017;162:665–77. link1
[25] Lane JL, de Haas DW, Lant PA. The diverse environmental burden of city-scale urban water systems. Water Res 2015;81:398–415. link1
[26] Larsen TA. CO2-neutral wastewater treatment plants or robust, climatefriendly wastewater management? A systems perspective. Water Res 2015;87:513–21. link1
[27] Lam KL, van der Hoek JP. Low-carbon urban water systems: opportunities beyond water and wastewater utilities? Environ Sci Technol 2020;54 (23):14854–61. link1
[28] Zhou Y, Zhang B, Wang H, Bi J. Drops of energy: conserving urban water to reduce greenhouse gas emissions. Environ Sci Technol 2013;47(19):10753–61. link1
[29] Lam KL, Kenway SJ, Lant PA. Energy use for water provision in cities. J Clean Prod 2017;143:699–709. link1
[30] Chini CM, Stillwell AS. The state of U.S. urban water: data and the energy– water nexus. Water Resour Res 2018;54(3):1796–811. link1
[31] Venkatesh G, Chan A, Brattebø H. Understanding the water–energy–carbon nexus in urban water utilities: comparison of four city case studies and the relevant influencing factors. Energy 2014;75:153–66. link1
[32] Mo W, Wang R, Zimmerman JB. Energy–water nexus analysis of enhanced water supply scenarios: a regional comparison of Tampa Bay, Florida, and San Diego, California. Environ Sci Technol 2014;48(10):5883–91. link1
[33] Nässén J. Determinants of greenhouse gas emissions from Swedish private consumption: time-series and cross-sectional analyses. Energy 2014;66:98–106. link1
[34] Olivier JGJ, Peters JAHW. Trends in global CO2 and total greenhouse gas emissions: 2020 report. Report. The Hague: PBL Netherlands Environmental Assessment Agency; 2020. link1
[35] Van der Hoek JP, Mol S, Janse T, Klaversma E, Kappelhof J. Selection and prioritization of mitigation measures to realize climate neutral operation of a water cycle company. J Water Clim Chang 2016;7(1):29–38. link1
[36] New Amsterdam climate—Amsterdam climate neutral roadmap 2050. Report. Amsterdam: Carbon Neutral Cities Alliance; 2020 Feb.
[37] Pathways to carbon-neutral NYC: modernize, reimagine, reach. Report. New York City: New York City Mayor’s Office of Sustainability; 2021 Feb.
[38] Climate Change Act 2017 [Internet]. Melbourne: Victoria State Government; 2017 Feb 23 [cited 2022 Apr 16]. Available online: https:// www.climatechange.vic.gov.au/legislation/climate-change-act-2017. link1
[39] Lam KL, Lant PA, Kenway SJ. Energy implications of the millennium drought on urban water cycles in southeast Australian cities. Water Sci Technol Water Supply 2018;18(1):214–21. link1
[40] Tokyo Metropolitan Government Bureau of Waterworks Five-Year Environmental Plan 2020–2024. Tokyo: Tokyo Metropolitan Government Bureau of Waterworks; 2020. Japanese.
[41] Global warming prevention plan in sewerage business—Earth plan 2017. Tokyo: Tokyo Metropolitan Government Bureau of Sewerage; 2017. Japanese.
[42] World Business Council for Sustainable Development, World Resources Institute. The greenhouse gas protocol: a corporate accounting and reporting standard. Geneva: World Business Council for Sustainable Development; 2004.
[43] Melbourne Water. Melbourne Water annual report 2019–2020. Report. Melbourne: Melbourne Water; 2020. link1
[44] Cventure LLC, Pasion C, Oyenuga C, Gouin K. City of New York inventory of New York City’s greenhouse gas emissions. Report. New York: Mayor’s Office of Sustainability; 2017.
[45] Environmental report 2017. Tokyo: Tokyo Metropolitan Government Bureau of Waterworks; 2017. Japanese.
[46] Our path to net zero [internet]. Melbourne: Melbourne Water; 2021 Nov 4 [cited 2022 Apr 16]. Available online: https://www.melbournewater.com.au/ water-data-and-education/environmental-issues/our-path-net-zero. link1
[47] Strazzabosco A, Kenway SJ, Lant PA. Quantification of renewable electricity generation in the Australian water industry. J Clean Prod 2020;254: 120119. link1
[48] Heisei 22 Tokyo Metropolitan Government Bureau of Sewerage Environmental report. Report. Tokyo: Tokyo Metropolitan Government Bureau of Sewerage; 2011. Japanese.
[49] Cost of carbon abatement in the Australian water industry. Report. Sydney: Water Services Association of Australia; 2012.
[50] Water Industry Act 1994 statements of obligations (emission reduction). Melbourne: Victoria State Government; 2018.
[51] Harrison JA, Deemer BR, Birchfield MK, O’Malley MT. Reservoir water-level drawdowns accelerate and amplify methane emission. Environ Sci Technol 2017;51(3):1267–77. link1
[52] Motelica-Wagenaar AM, Pelsma TAHM, Moria L, Kosten S. The potential impact of measures taken by water authorities on greenhouse gas emissions. Proc IAHS 2020;382:635–42. link1
[53] Van der Hoek JP, Mol S, Giorgi S, Ahmad JI, Liu G, Medema G. Energy recovery from the water cycle: thermal energy from drinking water. Energy 2018;162:977–87. link1
[54] Shimizu Y, Toyosada K, Yoshitaka M, Sakaue K. Creation of carbon credits by water saving. Water 2012;4(3):533–44. link1
[55] Beeftink M, Hofs B, Kramer O, Odegard I, van der Wal A. Carbon footprint of drinking water softening as determined by life cycle assessment. J Clean Prod 2021;278:123925. link1
[56] Kenway S, Conrad S, Jawad MP, Gledhill J, Bravo R, McCall J, et al. Opportunities and barriers for renewable and distributed energy resource development at drinking water and wastewater utilities. Denver: Water Research Foundation; 2019. link1
[57] Waternet research & innovation 2018 progress report. Report. Amsterdam: Waternet Innovatie; 2018.
[58] Hall MR, West J, Sherman B, Lane J, de Haas D. Long-term trends and opportunities for managing regional water supply and wastewater greenhouse gas emissions. Environ Sci Technol 2011;45(12):5434–40. link1
[59] Australian urban water utilities. National performance report 2019–20: urban water utilities, part A. Melbourne: Bureau of Meteorology; 2021. link1
[60] Zib III L, Byrne DM, Marston LT, Chini CM. Operational carbon footprint of the U.S. water and wastewater sector’s energy consumption. J Clean Prod 2021;321:128815. link1
[61] Yang G, Zhang G, Wang H. Current state of sludge production, management, treatment and disposal in China. Water Res 2015;78:60–73. link1
[62] Lam KL, Stokes-Draut JR, Horvath A, Lane JL, Kenway SJ, Lant PA. Life-cycle energy impacts for adapting an urban water supply system to droughts. Water Res 2017;127:139–49. link1
[63] Zhang Q, Smith K, Zhao X, Jin X, Wang S, Shen J, et al. Greenhouse gas emissions associated with urban water infrastructure: what we have learnt from China’s practice. Wiley Interdisc Rev: Water 2021;8(4): e1529. link1
[64] Application rule for memorandum on assessment of investment issues. Amsterdam: Government of Amsterdam; 2018. Dutch.
[65] Binks AN, Kenway SJ, Lant PA. The effect of water demand management in showers on household energy use. J Clean Prod 2017;157:177–89. link1
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