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Article

Microaerobic Digestion of Low-Biodegradable Sewage Sludge: Effect of Air Dosing in Batch Reactors

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Department of Civil, Environmental, Land, Building Engineering and Chemistry, Polytechnic University of Bari, Via E. Orabona 4, 70125 Bari, Italy
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Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy
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Department of Agricultural and Environmental Sciences (Di.S.A.A.T), University of Bari, Via Amendola 165/A, 70126 Bari, Italy
*
Authors to whom correspondence should be addressed.
Academic Editors: Vincenzo Torretta and Elena Rada
Sustainability 2021, 13(17), 9869; https://0-doi-org.brum.beds.ac.uk/10.3390/su13179869
Received: 12 August 2021 / Revised: 23 August 2021 / Accepted: 31 August 2021 / Published: 2 September 2021
The adoption of prolonged solid retention times during the biological treatment of urban wastewaters is a well-known strategy to reduce sewage sludge production. However, it also results in the production of a biological sludge with low percentages of biodegradable organic matter, also characterized by high humification degrees, which may hamper the anaerobic digestion treatment aimed at sludge stabilization. To accelerate the hydrolytic stage, the application of microaerobic conditions during the anaerobic digestion of low-biodegradable sewage sludge was investigated in this study. In particular, six bio-methanation tests of a real sewage sludge were carried out, introducing air in the bioreactors with doses ranging between 0 and 16.83 L air/kg VSin d, in order to evaluate the air dosage that optimizes the biomethane production and organic matter degradation. Notably, the lower air loading rates investigated in this study, such as 0.68 and 1.37 L air/kg VSin d, led to an increase in methane production of up to 19%, due to a higher degradation of total lipids and proteins. In addition, these microaerobic conditions also resulted in a decrease in the sludge humification degree and in lower volatile fatty acid accumulation. View Full-Text
Keywords: microaeration; sewage sludge; anaerobic digestion; WWTP; methane production; biogas microaeration; sewage sludge; anaerobic digestion; WWTP; methane production; biogas
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MDPI and ACS Style

Morello, R.; Di Capua, F.; Pontoni, L.; Papirio, S.; Spasiano, D.; Fratino, U.; Pirozzi, F.; Esposito, G. Microaerobic Digestion of Low-Biodegradable Sewage Sludge: Effect of Air Dosing in Batch Reactors. Sustainability 2021, 13, 9869. https://0-doi-org.brum.beds.ac.uk/10.3390/su13179869

AMA Style

Morello R, Di Capua F, Pontoni L, Papirio S, Spasiano D, Fratino U, Pirozzi F, Esposito G. Microaerobic Digestion of Low-Biodegradable Sewage Sludge: Effect of Air Dosing in Batch Reactors. Sustainability. 2021; 13(17):9869. https://0-doi-org.brum.beds.ac.uk/10.3390/su13179869

Chicago/Turabian Style

Morello, Raffaele, Francesco Di Capua, Ludovico Pontoni, Stefano Papirio, Danilo Spasiano, Umberto Fratino, Francesco Pirozzi, and Giovanni Esposito. 2021. "Microaerobic Digestion of Low-Biodegradable Sewage Sludge: Effect of Air Dosing in Batch Reactors" Sustainability 13, no. 17: 9869. https://0-doi-org.brum.beds.ac.uk/10.3390/su13179869

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