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7 results on '"Moscariello, Carlo"'

6. Effect of nickel on the comparative performance of inverse fluidized bed and continuously stirred tank reactors for biogenic sulphur-driven autotrophic denitrification

Author

Babu J. Alappat, Nicola Di Costanzo, Francesco Pirozzi, Stefano Papirio, Maneesh Namburath, Carlo Moscariello, Trichur Ramaswamy Sreekrishnan, Namburath, Maneesh, Papirio, Stefano, Moscariello, Carlo, Di Costanzo, Nicola, Pirozzi, Francesco, Alappat Babu, J., and Sreekrishnan, T. R.

Subjects
Environmental Engineering, Denitrification, Hydraulic retention time, 0208 environmental biotechnology, Mixing (process engineering), Biomass, Continuous stirred-tank reactor, 02 engineering and technology, 010501 environmental sciences, Management, Monitoring, Policy and Law, Autotrophic denitrification, Nitrate, 01 natural sciences, chemistry.chemical_compound, Bioreactors, Nickel, Continuously stirred tank reactor, Waste Management and Disposal, 0105 earth and related environmental sciences, Autotrophic Processes, Chemistry, Biogenic sulphur, General Medicine, Pulp and paper industry, 020801 environmental engineering, Wastewater, Fluidized bed, Inverse fluidized bed reactor, Sulfur
Abstract

The comparative performance of an inverse fluidized bed reactor (IFBR) having high density polyethylene beads as carrier materials for biofilm formation and a continuous stirred tank reactor (CSTR), both maintaining autotrophic denitrification using biogenic sulphur (ADBIOS) in the absence and presence of nickel (Ni2+), was studied. The reactors were compared in terms of NO3−-N and NO2−-N removal and SO42--S production throughout the study. A simulated wastewater with an inlet NO3−-N concentration of 225 mg/L and a decreasing concentration of biogenic sulphur (bio-S) from 1.5 to 0.375 g/L was used. Both reactors were operated at a hydraulic retention time (HRT) of 48 h for 140 days and at an HRT of 42 h for the following 68 days. A more efficient ADBIOS was observed in the CSTR than IFBR throughout the study due to a better mixing of the feed wastewater in the bulk liquid and a higher availability of bio-S to the suspended cells. The NO3−-N removal efficiency in the IFBR decreased by approximately 41% when the feed bio-S was reduced to 0.375 g/L, while it remained unaffected in the CSTR. Conversely, the presence of Ni2+ did not significantly affect NO3−-N removal in both reactors even at a feed Ni2+ concentration of 120 mg/L. The highest NO3−-N removal rates achieved were 86 and 108 mg NO3−-N/(L·day) in the IFBR and CSTR, respectively, in the presence of 120 mg/L of feed Ni2+ at an HRT of 42 h. Batch studies conducted with acclimatized biomass showed that the continuous-flow operation mode in both reactors played a major role in helping the autotrophic denitrifiers to tolerate Ni2+ toxicity.

Published
2020

7. Valorisation of industrial hemp ( Cannabis sativa L.) residues and cheese whey into volatile fatty acids for single cell protein production.

Author

Moscariello C, Matassa S, Pirozzi F, Esposito G, and Papirio S

Abstract

The production of single cell protein (SCP) using lignocellulosic materials stands out as a promising route in the circular bioeconomy transition. However, multiple steps are necessary for lignocellulosics-to-SCP processes, involving chemical pretreatments and specific aerobic cultures. Whereas there are no studies that investigated the SCP production from lignocellulosics by using only biological processes and microbial biomass able to work both anaerobically and aerobically. In this view, the valorisation of industrial hemp ( Cannabis sativa L.) biomass residues (HBRs), specifically hurds and a mix of leaves and inflorescences, combined with cheese whey (CW) was investigated through a semi-continuous acidogenic co-fermentation process (co-AF). The aim of this study was to maximise HBRs conversion into VFAs to be further used as carbon-rich substrates for SCP production. Different process conditions were tested by either removing CW or increasing the amount of HBRs in terms of VS (i.e., two and four times) to evaluate the performance of the co-AF process. Increasing HBRs resulted in a proportional increase in VFA production up to 3115 mg HAc L -1 , with experimental production nearly 40% higher than theoretical predictions. The synergy between HBRs and CW was demonstrated, proving the latter as essential to improve the biodegradability of the former. The produced VFAs were subsequently tested as substrates for SCP synthesis in batch aerobic tests. A biomass concentration of 2.43 g TSS L -1 was achieved with a C/N ratio of 5.0 and a pH of 9.0 after two days of aerobic fermentation, reaching a protein content of 42% (g protein per g TSS). These results demonstrate the overall feasibility of the VFA-mediated HBR-to-SCP valorisation process., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2024 The Authors.)

Published
2024
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