Comparative Analysis of the Energy Consumption of Different Wastewater Treatment Plants
Wastewater treatment is a process of intensive use of resources, mainly energy, which accounts for 15 to 40% of the operating costs in conventional wastewater treatment systems. With the expected demographic increase and the restrictive trend in quality standards for effluent discharge, the energy consumption tends to increase further if there are no changes in the processes. The literature gathers the energy consumption of different wastewater treatment systems, in an attempt to map the processes and to help the decision making in the search for better alternatives. One of these alternatives is the recovery of energy from the sewer. The conventional treatment system requires between 0.3 and 0.6 kWh/m3, while the energy contained in the wastewater may be up to 10 times of the one required for the treatment. The simultaneous wastewater treatment and power generation, called the hybrid treatment system, is a worldwide trend. In Brazil, recent studies have shown, through energy balances, the energy viability of anaerobic-aerobic systems, with the production of algae. This work presents a comparative review of the energy consumption of different wastewater treatment plants, aiming at a better understanding and management of the processes. The results showed that there are few Brazilian data published, indicating that the country still demands more studies on the subject to improve its processes. In the treatment of wastewater, most studies point to the aerobic process as the largest consumer of energy, and efforts are focused on the optimization of the conventional system, but still without great achievements. Environmental goals and water supply strategies are poorly integrated with the energy handling, leading to an inefficient use, and with economic and environmental consequences.
Renan Barroso Soares,
Marina Santos Memelli,
Regiane Pereira Roque,
Ricardo Franci Gonçalves,
Comparative Analysis of the Energy Consumption of Different Wastewater Treatment Plants, International Journal of Architecture, Arts and Applications.
Vol. 3, No. 6,
2017, pp. 79-86.
KANG, J.; CHAE, K. J. Estimating the energy independence of a municipal wastewater treatment plant incorporating green energy resources. Energy Conversion and Management, v. 75, p. 664-672, 2013.
TOJA, Yago L., ROWE, Ian V., AMORES, María J., RIFÉ, Montserrat T., NAVARRO Desirée M., MOREIRA, María T., FEIJOO, Gumersindo. Benchmarking wastewater treatment plants under an eco-efficiency perspective. Science of the Total Environment, v. 566–567 p. 468–479, 2016.
WANG, H.; YANG, Y.; KELLER, A. A.; LI, X.; FENG, S.; DONG, Y.; LI, F. Comparative analysis of energy intensity and carbon emissions in wastewater treatment in USA, Germany, China and South Africa. Applied Energy, in press, 2016.
VIEIRA, A. S.; GHISI, E. Water-energy nexus in low-income houses in Brazil: the influence of integrated on-site water and wastewater management strategies on the energy consumption of water and sewerage services. Journal of Cleaner Production, v. 133, p. 145-162, 2016.
MUGA, H. E., MIHELCIC, J. R. Sustainability of wastewater treatment technologies. Journal of Environmental Management, v. 88, p. 437–447, 2008.
LEMOS, D., DIAS, A. C., GABARRELL, X., ARROJA, L. Environmental assessment of an urban water system. Journal of Cleaner Production, v. 54, p. 157- 165, 2013.
BRASIL. Ministério de Minas e Energia. Balanço Energético Nacional, ano base 2014, 2015.
BALKEMA, Annelies J., PREISIG, Heinz A., OTTERPOHL, Ralf, LAMBERT, Fred J. D. Indicators for the sustainability assessment of wastewater treatment systems. Urban Water, v. 4, p. 153–161, 2002.
RISCH, E.; GUTIERREZ, O.; ROUX, P.; BOUTIN, C.; COROMINAS, L. Life cycle assessment of urban wastewater systems: Quantifying the relative contribution of sewer systems. Water Research, v. 77, p. 35-48, 2015.
VILANOVA, Mateus R. N., BALESTIERI, José A. P. Exploring the water-energy nexus in Brazil: The electricity use for water supply. Energy, v. 85, p. 415-432, 2015.
BUONOCORE, E.; MELLINO, S.; ANGELIS, G.; LIU, G.; ULGIATI, S. Life cycle assessment indicators of urban wastewater and wastewater sludge treatment. Ecological Indicator, in press, 2016.
SPERLING, M. V. Wastewater Characteristics, Treatment and Disposal. Editora IWA, Biological Wastewater Treatment Series, volume 1, 2007.
MAHGOUB, M. E. M.; STEEN, N. P.; ZEID, K. A.; VAIRAVAMOORTHY, K. Towards sustainability in urban water: a life cycle analysis of the urban water system of Alexandria City, Egypt. Journal of Cleaner Production, v. 18, p. 1100-1106, 2010.
VILANOVA, Mateus R. N., BALESTIERI, José A. P. Modeling of hydraulic and energy efficiency indicators for water supply systems. Renewable and Sustainable Energy Reviews, v. 48, p. 540-557, 2015.
Fundação Nacional de Saúde (FUNASA). Manual de Saneamento. Editora Assessoria de Comunicação e Educação em Saúde, 4ª edição revisada, 2006.
SANTOS, A. C.; PUCH, G. Z.; DIEZ, D. B.; DIÉGUEZ, C. G. Thermodynamic and exergoeconomic analysis of energy recovery system of biogas from a wastewater treatment plant and use in a Stirling engine. Renewable Energy, v. 88, p. 171-184, 2016.
SINGH, P.; KANSAL, A. Energy and GHG accounting for wastewater infrastructure. Resources, Conservation and Recycling, in press, 2016.
METCALF & EDDY. Tratamento de efluentes e recuperação de recursos. Editora AMGH, 5ª Edição, 2013. Tradução Ivanildo Hespanhol e Jose Calos Mierzwa, 2016.
CATARINO, J.; HENRIQUES, J. Sustainable value e an energy efficiency indicator in wastewater treatment plants. Journal of Cleaner Production, in press, 2016.
VARBANOV, P.; ENDERLE, P.; NOWAK, O. Ways to optimize the energy balance of municipal wastewater systems: lessons learned from Austrian applications. Journal of Cleaner Production, v. 88, p. 125-131, 2015.
BODÍK, I., KUBASKÁ, M. Energy and sustainability of operation of a wastewater treatment plant. Environment Protection Engineering, v. 39, p. 15-24, 2013.
PANEPINTO, D., FIORE, S., ZAPPONE, M., GENON, G., MEUCCI, L. Evaluation of the energy efficiency of a large wastewater treatment plant in Italy. Applied Energy, v. 161, p. 404–411, 2016.
WAKEEL, M.; CHEN, B.; HAYAT, T.; ALSAEDI, A.; AHMAD, B. Energy consumption for water use cycles in different countries: A review. Applied Energy, v. 178, p. 868-885, 2016.
MATOS, C., PEREIRA, S., AMORIM, E. V., BENTES, I., BRIGA-SÁ, A. Wastewater and greywater reuse on irrigation in centralized and decentralized systems- An integrated approach on water quality, energy consumption and CO2 emissions. Science of the Total Environment, v. 493, p. 463–471, 2014.
LONGO, S.; D’ANTONI, B. M.; BONGARDS, M.; CHAPARRO, A.; CRONRATH, A.; FATONE, F.; LEMA, J. M.; IGLESIAS, M. M.; SOARES, A.; HOSPIDO, A. Monitoring and diagnosis of energy consumption in wastewater treatment plants. A state of the art and proposals for improvement. Applied Energy, v. 179, p. 1251-1268, 2016.
FITZSIMONS, L., HORRIGAN, M., MCNAMARA, G., DOHERTY, E., PHELAN, T., CORCORAN, B., DELAURE, Y., CLIFFORD, Eoghan. Assessing the thermodynamic performance of Irish municipal wastewater treatment plants using exergy analysis: a potential benchmarking approach. Journal of Cleaner Production. v. 131, p. 387-398, 2016.
LI, F.; CHIRAMBA, T.; XU, J.; KELLER, A.; WANG, H.; DONG, Y.; GU, Y. Quantification of the water, energy and carbon footprints of wastewater treatment plants in China considering a water–energy nexus perspective. Ecological Indicators, v. 60, p. 402-409, 2016(a).
SHEN, Y.; LINVILLE, J. L.; DEMIRTAS, M. U.; MINTZ, M. M.; SNYDER, S. W. An overview of biogas production and utilization at full-scale wastewater treatment plants (WWTPs) in the United States: Challenges and opportunities towards energy-neutral WWTPs. Renewable and Sustainable Energy Reviews, v. 50, p. 346-362, 2015.
GARRIDO, R. S., SENANTE, M. M., SANCHO, F. H. Comparing the efficiency of wastewater treatment technologies through a DEA metafrontier model. Chemical Engineering Journal. v. 173, p. 766-772, 2011.
GIKAS, P. Towards energy positive wastewater treatment plants. Journal of Environmental Management, in press, 2016.
ORTIZ, M., RALUY, R. G., SERRA, L. Life cycle assessment of water treatment technologies: wastewater and water-reuse in a small town. Desalination, v. 204, p. 121–131, 2007.
LI, W.; LI, L.; QIU, G. Energy consumption and economic cost of typical wastewater treatment systems in Shenzhen, China. Journal of Cleaner Production, in press, 2016(b).
ZABANIOTOU, A. A.; SAMOLADA, M. C. Comparative assessment of municipal wastewater sludge incineration, gasification and pyrolysis for a sustainable sludge-to-energy management in Greece. Waste Management, v. 34, p. 411-420, 2014.
PEDROZA, M. M.; VIEIRA, G. E. G.; SOUSA, J. F.; PICKLER, A. C.; LEAL, E. R. M.; MILHOMEN, C. C. Produção e tratamento de lodo de esgoto – uma revisão. Revista Liberato, Novo Hamburgo, v. 11, p. 89-118, 2010.
WINKLER, M. K., BENNENBROEK, M. H., HORSTINK, F. H., VAN LOOSDRECHT, M. C. M., van de Pol, G.-J. The biodrying concept: an innovative technology creating energy. Bioresource Technology, v. 147, p. 124-129, 2013.
PRADEL, Marilys, AISSANI, Lynda, VILLOT, Jonathan, BAUDEZ, Jean-Christophe, LAFOREST, Valérie. From waste to added value product: towards a paradigm shift in life cycle assessment applied to wastewater sludge e a review. Journal of Cleaner Production. v. 131, p. 60-75, 2016.
VYMAZAL, J. Horizontal sub-surface flow and hybrid constructed wetlands systems for wastewater treatment. Ecology Engineer. v. 25(5), p. 478–90, 2005.
TEE, Pei F., ABDULLAH, Mohammad O., TAN, Ivy A. W., RASHID, Nur K. A., AMIN, Mohamed A. M., HIPOLITO, Cirilo N., BUJANG, Kopli. Review on hybrid energy systems for wastewater treatment and bio-energy production. Renewable and Sustainable Energy Reviews, v. 54, p. 235-246, 2016.
BRASIL. Ministério das Cidades. Sistema Nacional de Informações sobre Saneamento (SNIS), Diagnóstico dos Serviços de Água e Esgotos - 2014, 2016.
SILVESTRE, G., FERNÁNDEZ, B., BONMATÍ, A. Significance of anaerobic digestion as a source of clean energy in wastewater treatment plants. Energy Conversion and Management, v. 101, p. 255–262, 2015.
SANTOS, I. F. S.; BARROS, R. M.; FILHO, G. L. T. Electricity generation from biogas of anaerobic wastewater treatment plants in Brazil: an assessment of feasibility and potential. Journal of Cleaner Production, v. 126, p. 504-514, 2016.
PROBIOGAS - Projeto Brasil-Alemanha de Fomento ao Aproveitamento Energético de Biogás no Brasil. Viabilidade técnico-econômica de produção de energia elétrica em ETEs a partir do biogás, Brasília, 2016. Disponível em: . Acessado em 19/11/2016.
AZEREDO, L. Z. Potencial energético de uma estação de tratamento de esgoto sanitário dotada de um reator anaeróbio do tipo UASB, uma lagoa de alta taxa e um processo de separação e reciclagem da biomassa algácea. Vitória, 81p, 2016. Dissertação (Mestrado) - Universidade Federal do Espírito Santo.
BRASIL. Ministério das Cidades. Guia Prático do Biogás: Geração e Utilização. Editora Fachagentur Nachwachsende Rohstoffe e. V. (FNR), 5ª edição revisada, 2010, traduzido por Marcos de Miranda Zattar.