Evaluation of energy recovery potential in wastewater treatment based on codigestion and combined heat and power schemes

Sarpong, Gideon; Gude, Veera Gnaneswar; Magbanua, Benjamin S.; Truax, Dennis D.

doi:10.1016/j.enconman.2020.113147

Cited by 36 publications

(20 citation statements)

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“… 42 Scheme 5 (S5) includes enhanced primary settling techniques (in addition to longer hydraulic retention time, HRT) such as micro or disk filters to increase carbon capture to be processed in the anaerobic digester. 16 , 17 , 46 , 47 External organic feedstock such as fat, oil, and grease and high strength organic waste sludge from food, dairy, and agricultural industries are also fed to the digester to enhance biogas production. Scheme 6 (S6) considers the integration of biological carbon and nitrogen removal in a bioelectrochemical system using heterotrophic and mixotrophic (hetero and autotrophic) biofilms for bioelectricity generation.…”

Section: Evaluation Of Resource-efficient Process Schemesmentioning

confidence: 99%

“…Note that the results will vary for the above scenario with plant capacity and primary setting process efficiency, and these can be found elsewhere. 16 , 17 …”

Section: Evaluation Of Resource-efficient Process Schemesmentioning

confidence: 99%

“…Energy recovery potential in a wastewater treatment plant depends on various factors such as wastewater characteristics (low strength vs high strength in terms of COD), process operating scheme (biological treatment process), plant capacity, and energy recovery scheme. − Wastewater treatment plants can adopt circular economy principlesa concept revolving around keeping materials and products in the economy as long as possible by promoting recycle and reuseboth at small- and large-scale applications. Many wastewater treatment plants are currently exploiting the additional digestion capacity of existing anaerobic digesters to process external high strength organic wastes for better utilization of the plant footprint and for generating additional revenues.…”

Section: Energy Recovery Potential In Wastewater Treatmentmentioning

confidence: 99%

“… Scheme 3 (S3) considers an integrated process including anaerobic treatment and anammox treatment processes to minimize aeration energy consumption for both organic carbon and nitrogen removal and increase sludge digestion to enhance methane production. ,, Scheme 4 (S4) considers a bioelectrochemical system where the organic matter is converted to an electron flow to be harvested as electricity followed by nitrogen removal in a simultaneous nitritation and anammox denitrification (SNAD) process (see Figure ). Scheme 5 (S5) includes enhanced primary settling techniques (in addition to longer hydraulic retention time, HRT) such as micro or disk filters to increase carbon capture to be processed in the anaerobic digester. ,,, External organic feedstock such as fat, oil, and grease and high strength organic waste sludge from food, dairy, and agricultural industries are also fed to the digester to enhance biogas production. Scheme 6 (S6) considers the integration of biological carbon and nitrogen removal in a bioelectrochemical system using heterotrophic and mixotrophic (hetero and autotrophic) biofilms for bioelectricity generation. , This configuration (ABC) facilitates simultaneous carbon and nitrogen removal by using an anammox biocathode process. Both S5 and S6 configurations involve enhanced carbon capture in primary treatment so that lower amounts of carbon will require further removal by biological processes (see Figure ).…”

Section: Evaluation Of Resource-efficient Process Schemesmentioning

confidence: 99%

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Transitioning Wastewater Treatment Plants toward Circular Economy and Energy Sustainability

2021

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Aging infrastructure, increasing environmental regulations, and receiving water environment issues stem the need for advanced wastewater treatment processes across the world. Advanced wastewater treatment systems treat wastewater beyond organic carbon removal and aim to remove nutrients and recover valuable products. While the removal of major nutrients (carbon, nitrogen, and phosphorus) is essential for environmental protection, this can only be achieved through energy-, chemical-, and cost-intensive processes in the industry today, which is an unsustainable trend, considering the global population growth and rapid urbanization. Two major routes for developing more sustainable and circular-economy-based wastewater treatment systems would be to (a) innovate and integrate energy- and resource-efficient anaerobic wastewater treatment systems and (b) enhance carbon capture to be diverted to energy recovery schemes. This Mini-Review provides a critical evaluation and perspective of two potential process routes that enable this transition. These process routes include a bioelectrochemical energy recovery scheme and codigestion of organic sludge for biogas generation in anaerobic digesters. From the analysis, it is imperative that integrating both concepts may even result in more energy- and resource-efficient wastewater treatment systems.

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Section: Evaluation Of Resource-efficient Process Schemesmentioning

confidence: 99%

“…Note that the results will vary for the above scenario with plant capacity and primary setting process efficiency, and these can be found elsewhere. 16 , 17 …”

Section: Evaluation Of Resource-efficient Process Schemesmentioning

confidence: 99%

Section: Energy Recovery Potential In Wastewater Treatmentmentioning

confidence: 99%

Section: Evaluation Of Resource-efficient Process Schemesmentioning

confidence: 99%

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Transitioning Wastewater Treatment Plants toward Circular Economy and Energy Sustainability

2021

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“…(Neugebauer et al, 2015) calculated the heat energy potential of Austrian wastewater treatment plants (larger than 2000 population equivalents). (Sarpong et al, 2020) evaluated energy recovery potential in wastewater treatment facilities. including codigesting of sewage sludge.…”

Section: Introductionmentioning

confidence: 99%

Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

Živković

Ivezić

2021

Clean Techn Environ Policy

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Transformation of the heating sector is recognized as being essential for ensuring reliable and affordable energy services provided with reduced consumption of energy sources, diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused energy source in Serbia, while data about the potential of this energy source are lacking. This research proposes a methodology for the determination

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A Novel District Heating System Coupled with Reclaimed Water Source Heat Pump: Energy, Economic, Environmental, and Application Analysis

Wang

Zhang

et al. 2022

Energy Tech

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Wastewater treatment plants (WWTPs) are an energy-intensive industry. The high energy consumption of WWTPs is detrimental to achieving carbon neutrality. Wastewater treatment accounts for an estimated 3.4% of annual electricity consumption in the United States, nearly 1% of the total electricity consumption in Germany, and 0.25% of the total electricity consumption in China. [1][2][3] The unit electricity consumption for wastewater treatment in the aforementioned countries is around 0.52, 0.40, and 0.254 kWh m À3 , respectively. [3] The volume and standard of wastewater treatment will be further improved due to the increase in urban population and more stringent environmental protection requirements, [4] which will bring higher energy consumption. To achieve the energy balance of wastewater treatment, it is necessary to recover energy from resources contained in wastewater. [5] In the early period, most of the energy recovery of wastewater concentrated on organic matter in wastewater. Organic energy in wastewater is about 9-10 times higher than that used to treat wastewater. [6] Researchers have explored the potential of biogas generated from sludge for power generation at the national level. [7,8] For example, the vast majority of existing biogas plants in Sweden are located in WWTPs, which almost accounts for 60% of the total biogas production (3 PJ year À1 ). [7] Anaerobic digestion plays an important role for its abilities to further transform organic matter into biogas. [9,10] However, anaerobic sludge digestion systems tend not to be well operated in developing countries. For example, less than 100 WWTPs in China (3% of all plants) use biogas from anaerobically digested sludge to generate heat and electricity. [11] Co-digestion with kitchen or other organic wastes is currently only applied on a laboratory scale in China. [12] The chemical energy extracted from the wastewater depends not only on the amount of biodegradable chemical oxygen demand (COD) in the wastewater, but also on the conversion efficiency of chemical energy in CHP system. Hao et al. think based on a BNR-WWTP (an AAO process; Q ¼ 600 000 m 3 d À1 ), only about 13% (0.20 kWh m À3 ) of the theoretical chemical energy (1.54 kWh m À3 at COD ¼ 400 mg L À1 , in the influent of the evaluated WWTP) can be converted into electricity and heat. [5] The thermal energy recovery potential of wastewater was significantly higher than that of chemical energy. [13] In northern China, the wastewater temperatures are 10-16 °C. [13][14][15] The large amount of low-grade thermal energy from wastewater is not fully utilized. The untreated wastewater will scale at the heat exchanger, which will affect the heat transfer effect, so treated

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Evaluation of energy recovery potential in wastewater treatment based on codigestion and combined heat and power schemes

Cited by 36 publications

References 53 publications

Transitioning Wastewater Treatment Plants toward Circular Economy and Energy Sustainability

Transitioning Wastewater Treatment Plants toward Circular Economy and Energy Sustainability

Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

A Novel District Heating System Coupled with Reclaimed Water Source Heat Pump: Energy, Economic, Environmental, and Application Analysis

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