Energy Issues in Sustainable Urban Wastewater Management: Use, Demand Reduction and Recovery in the Urban Water Cycle

Capodaglio, Andrea G.; Olsson, Gustaf

doi:10.3390/su12010266

Cited by 216 publications

(160 citation statements)

References 82 publications

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“…Here, new technologies could help to optimize water usage. For instance, recovery of the energy content of process residuals could allow significant additional energy recovery and increased greenhouse emissions abatement [23].…”

Section: Challenges and Opportunitiesmentioning

confidence: 99%

Water–Energy Nexus: Addressing Stakeholder Preferences in Jordan

et al. 2020

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The water and energy sectors are fundamentally linked. In Jordan, especially in the face of a changing climate, the water–energy nexus holds a number of challenges but also opportunities. A key point in exploring synergies is the identification of such, as well as the communication between the water and energy sectors. This paper promotes the importance of using a co-creative approach to help resolve opposing views and assessing stakeholder preferences in the context of the water–energy nexus in Jordan. A computer-supported, co-creative approach was used to evaluate stakeholder preferences and opinions on criteria and future scenarios for the energy and water sector in Jordan, identifying common difficulties and possibilities. The criteria describe socio-ecological aspects as well as techno-economic aspects for both systems. Discussing a set of preliminary scenarios describing possible energy and water futures ranked under a set of sector relevant criteria, a consensus between both stakeholder groups is reached. The robustness of results is determined, using a second-order probabilistic approach. The results indicate that there are no fundamental conflicts between the energy and water stakeholder groups. Applying a participatory multi-stakeholder, multi-criteria framework to the energy-water nexus case in Jordan promotes a clear understanding of where different stakeholder groups stand. This understanding and agreement can form the basis of a joint water–energy nexus policy used in the continued negotiation process between and within national and international cooperation, as well as promoting and developing acceptable suggestions to solve complex problems for both sectors.

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Section: Challenges and Opportunitiesmentioning

confidence: 99%

Water–Energy Nexus: Addressing Stakeholder Preferences in Jordan

et al. 2020

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“…where Q WRRF is the flow rate at the inflow of the WRRF (L s −1 ). Considering an 800-kW heat power demand, coupled with a flow rate of 90 L s −1 , the decrease in the wastewater temperature would be 2.12 • C, calculated using Equation (1). Taking into consideration the winter months, when heat demand is higher (December, January, and February, as shown in Figure 1), the temperature drop calculated using Equation (2) would be in the range of 0.42-1.45 • C, in the case of the maximum and minimum flow rates recorded in that period.…”

Section: Heat Recovery: Influence On the Wastewater Temperaturementioning

confidence: 99%

“…The nexus between water and energy is becoming ever more crucial in the development of innovative solutions to achieve technically-feasible and socially-desirable sustainable management for the growth and resilience of urban areas [1]. Novel strategies are being developed to enhance the sustainability of the water cycle and the recycling of its resources in modern cities [2].…”

Section: Introductionmentioning

confidence: 99%

Energy Recovery from Wastewater: A Study on Heating and Cooling of a Multipurpose Building with Sewage-Reclaimed Heat Energy

et al. 2019

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To achieve technically-feasible and socially-desirable sustainable management of urban areas, new paradigms have been developed to enhance the sustainability of water and its resources in modern cities. Wastewater is no longer seen as a wasted resource, but rather, as a mining ground from which to obtain valuable chemicals and energy; for example, heat energy, which is often neglected, can be recovered from wastewater for different purposes. In this work, we analyze the design and application of energy recovery from wastewater for heating and cooling a building in Brno (Czech Republic) by means of heat exchangers and pumps. The temperature and the flow rate of the wastewater flowing in a sewer located in the proximity of the building were monitored for a one-year period, and the energy requirement for the building was calculated as 957 MWh per year. Two options were evaluated: heating and cooling using a conventional system (connected to the local grid), and heat recovery from wastewater using heat exchangers and coupled heat pumps. The analysis of the scenarios suggested that the solution based on heat recovery from wastewater was more feasible, showing a 59% decrease in energy consumption compared to the conventional solution (respectively, 259,151 kWh and 620,475 kWh per year). The impact of heat recovery from wastewater on the kinetics of the wastewater resource recovery facility was evaluated, showing a negligible impact in both summer (increase of 0.045 • C) and winter conditions (decrease of 0.056 • C).Sustainability 2020, 12, 116 2 of 11 source of different types of energy: electrical energy from bioelectrochemical wastewater treatment processes [7,8], low-head hydroelectric energy [9], biogas from anaerobic digestion [10], renewable fuels from residual sludge processing [11,12], and heat energy [13]. The latter is particularly appealing in the framework of water-energy sustainable urban development; in particular, the heat energy recovery potential from wastewater could possibly be even higher than its recoverable chemical energy potential [14,15], and it does not require biological treatment to be converted into a directly usable form. Waste heat from wastewater is reportedly able to generate electrical energy via a thermoelectric generator [16], but the implementation of this is difficult within an urban context. A more accessible technology is the energy recovery from wastewater using heat exchangers installed directly in the sewage collection system [17]. A heat exchanger is installed in direct contact with the wastewater that serves as a heat source or sink, and is later connected to a heat pump and then to the heating and cooling system of a building situated in close proximity. Temperatures of civil wastewater may be more than 25-27 • C in domestic outflows [18], representing a significant thermal energy source [16]; at the inlet of water treatment plants or water resource recovery facilities (WRRFs), the temperature is far lower (15-25 • C or lower, depending on the climate) [16,19,20], and thus,...

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“…Modernization policy planning and implementation of municipal wastewater treatment plants (WWTPs) in order to reduce negative environmental impact is a key element for a sustainable management in concordance with circular economy (CE) view [1][2][3]. Evolution of rapid techniques together with the development of fundamentally new sludge-processing stages thereby lead to energy consumption growth [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Energy and material assessment of municipal sewage sludge applications under circular economy

Kiselev¹,

Глушанкова²,

Рудакова³

et al. 2020

Int. J. EQ

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In the last decades, the amount of municipal sewage sludge generation rate has drastically increased due to population growth, spatial sewerage system development, and implementation of new treatment techniques. Nowadays, it is considered a globally prominent issue. Municipal sewage sludge contains pathogenic bacteria and viruses along with heavy metals, poorly biodegradable organic compounds, pharmaceuticals, and microplastics, which make its utilization management quite difficult. Landfill placement of sewage sludge is the most widely used technique worldwide, but is obsolete and inefficient, and accompanied by significant risk of environmental pollution with high logistics expenditure. Moreover, landfill placement means that all residual energy and potential material reuse applications are lost. The introduction of modern treatment techniques can solve the problem with sewage sludge generation, but it results in strong energy consumption increase of energy consumption. Modernization and operational policies based on circular economy principles are focused on relevant sewage sludge utilization issues with the potential use of waste-to-energy and recycling applications. The paper presents a methodological approach of cradle-to-grave assessment of sewage sludge treatment process based on energy and material flow analysis. The proposed methodology is studied within the real operational activities of big-scale wastewater treatment plants of two of the largest cities of Russia-Ekaterinburg and Perm. This investigation provides an efficient managerial tool for sustainable development that can be used by wide range of stakeholders.

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Energy Issues in Sustainable Urban Wastewater Management: Use, Demand Reduction and Recovery in the Urban Water Cycle

Cited by 216 publications

References 82 publications

Water–Energy Nexus: Addressing Stakeholder Preferences in Jordan

Water–Energy Nexus: Addressing Stakeholder Preferences in Jordan

Energy Recovery from Wastewater: A Study on Heating and Cooling of a Multipurpose Building with Sewage-Reclaimed Heat Energy

Energy and material assessment of municipal sewage sludge applications under circular economy

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