Use of activated sludge biomass as an agent for advanced primary separation

Araneda, Michael; Pavez, Javier; Luza, Benjamin; Jeison, David

doi:10.1016/j.jenvman.2017.01.030

Cited by 8 publications

(2 citation statements)

References 28 publications

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“…This process involves the recirculation of secondary sludge into the primary settling tank, resulting in the formation of larger flocs with increased settling velocities, indicating a greater potential for biogas production during anaerobic digestion. This phenomenon is attributed to the presence of extracellular polymeric substances (EPS) in the secondary sludge stream [93][94][95]. As proposed by Araneda et al [95], remarkably, the application of this technique could result in a substantial 50% increase in biogas production.…”

Section: Treatment Processes and Enhancement Of Primary Sludge Anaero...mentioning

confidence: 96%

“…This phenomenon is attributed to the presence of extracellular polymeric substances (EPS) in the secondary sludge stream [93][94][95]. As proposed by Araneda et al [95], remarkably, the application of this technique could result in a substantial 50% increase in biogas production. Furthermore, this approach holds promise not only for managing primary sludge but also for wastewater treatment, as it effectively reduces the energy demands associated with aeration during secondary treatment processes.…”

Section: Treatment Processes and Enhancement Of Primary Sludge Anaero...mentioning

confidence: 96%

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Enhancing Methane Yield in Anaerobic Co-Digestion of Primary Sewage Sludge: A Comprehensive Review on Potential Additives and Strategies

Sakaveli,

Petala,

Tsiridis

et al. 2024

Waste

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Traditionally, anaerobic digestion has been applied to mixed sludge, combining primary sludge (PS) with secondary sludge. However, recent research has unveiled the advantages of dedicated PS digestion due to its higher energy content. Anaerobic digestion (AD) of primary sewage sludge can offer a sustainable solution for managing sewage sludge while generating renewable energy. The present study provides a comprehensive examination of the current state of knowledge regarding the anaerobic digestion of PS. Co-digestion of PS with organic substrates, including food waste and agro-industrial residues, emerges as a promising approach to boost biogas production. Additionally, the utilization of additives such as glucose and clay minerals has shown potential in improving methane yield. Critical factors affecting AD, such as pretreatment methods, carbon-to-nitrogen (C/N) ratio, temperature, pH, volatile fatty acids (VFAs) levels, organic loading rates (OLR), inoculum-to-substrate ratio (ISR), and the role of additives, have been meticulously studied. Finally, this review consolidates existing knowledge to advance our understanding of primary sewage sludge anaerobic digestion, fostering more efficient and sustainable practices in sludge management and renewable energy generation.

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