Strategy for introducing sewage sludge energy utilization systems at sewage treatment plants in large cities in Japan: A comparative assessment

Wang, Kehua; Nakakubo, Toyohiko

doi:10.1016/j.jclepro.2021.128282

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…The current methods used in sewage sludge volume reduction and energy recovery include anaerobic digestion, incineration, pyrolysis, gasification, and others [11,12]. Anaerobic digestion (AD) is a proven sewage sludge treatment technology, and its benefits have been widely recognized [1].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Mesophilic Anaerobic Digestion of Waste-Activated Sludge through Heat Pretreatment and Kinetic Modeling

et al. 2023

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Sewage sludge is a useful raw material for the production of renewable energy due to its stable annual output. In this study, the enhancement of mesophilic anaerobic digestion of sewage sludge through heat pretreatment at 95 °C for 30 min was tested in an anaerobic moving bed biofilm reactor (hAMBBR). The sludge retention time was set at 20, 15, 10, and 5 days during 300 days of operation and compared to a traditional anaerobic continuous stirred tank reactor (AnCSTR) without pretreatment. Results of this research indicate that the digestion ratio of volatile soluble solids in the hAMBBR process could be improved by 50%, and the average conversion ratio of methane could be increased by 45%. When the sludge retention time (SRT) was shortened to 5 days, the methane production approached twice that of the contrast reactor. The expanded anaerobic digestion model, including activated sludge models, was utilized for operation simulation. The effect of sludge retention time (SRT) shortening on volatile suspended solids (VSS) digestibility and methane production was well reproduced with simulations. The research conclusion reveals the impact of pretreatment and reactor types on anaerobic digestion and provides the scientific basis for improving methane production and process efficiency in anaerobic digestion.

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Section: Introductionmentioning

confidence: 99%

Enhancing Mesophilic Anaerobic Digestion of Waste-Activated Sludge through Heat Pretreatment and Kinetic Modeling

et al. 2023

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“…Increasingly, wastewater professionals are becoming interested in the additional energy generation potential of WWTPs beyond that of on-site digester gas combustion or cogeneration ( Capodaglio et al 2020 ). The concept of wastewater as an energy source must be reconsidered, such as utilizing digested sewage sludge for incineration and electricity generation can provide a significant amount of energy recovery ( Wang et al 2021 ). Furthermore, on-site energy generation at WWTPs could allow nutrient recycling from wastewater and reuse of treated wastewater for irrigation and industrial processes ( Marangon et al 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Integration of renewable energy in wastewater treatment during COVID-19 pandemic: Challenges, opportunities, and progressive research trends

Zahmatkesh¹,

Amesho²,

Sillanpää³

et al. 2022

Cleaner Chemical Engineering

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“…It examined the economic efficiency of co-processing sludge with municipal waste and reported the limitations of the study, which did not consider the different capacities of incinerators. Other studies showed that energy consumption and operation cost are related to the implementation scale, and therefore the analyses were conducted on a large-scale sewage sludge recycling system (STRS) to avoid scale effects [9,15]. Luo et al [2] presented the results of environmental and economic analysis for full-scale sludge pyrolysis systems and proved that a larger pyrolysis system for centralized sludge handling was more economically favorable.…”

Section: Introductionmentioning

confidence: 99%

Environmental and Economic Implication of Implementation Scale of Sewage Sludge Recycling Systems Considering Carbon Trading Price

et al. 2022

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With China’s ongoing economic development and increasing emphasis on environmental protection, the number and treatment capacity of sewage plants is increasing annually. Simultaneously, sludge production is increasing. In recent years, researchers have investigated various approaches to the environmental and economic analysis of sludge treatment and recycling systems (STRS). These investigations did not take the universal law of different capacities for environmental impact and STRS economics into account. The aim of this study was to analyze the scale effect of STRS with different technologies (i.e., incineration, aerobic composting, used in material (brick), anaerobic digestion) on the environment and economy. Moreover, the cost–benefit impact of introducing a carbon- trading mechanism into the STRS to achieve carbon neutrality was analyzed. After reducing carbon emissions through by-products of STRS, the carbon emission quota can be sold, which will generate income. The results show that the break-even scales for incineration, anaerobic composting, used in building material (brick), and anaerobic digestion are 54,899, 6707, 48,775, and 4425 t/y, respectively. The break-even scale of each system decreased after the introduction of the carbon trading system into the STRS. These findings could provide critical technical information for superior decision-making in sewage sludge recycling systems.

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Strategy for introducing sewage sludge energy utilization systems at sewage treatment plants in large cities in Japan: A comparative assessment

Cited by 9 publications

References 6 publications

Enhancing Mesophilic Anaerobic Digestion of Waste-Activated Sludge through Heat Pretreatment and Kinetic Modeling

Enhancing Mesophilic Anaerobic Digestion of Waste-Activated Sludge through Heat Pretreatment and Kinetic Modeling

Integration of renewable energy in wastewater treatment during COVID-19 pandemic: Challenges, opportunities, and progressive research trends

Environmental and Economic Implication of Implementation Scale of Sewage Sludge Recycling Systems Considering Carbon Trading Price

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