7 results on '"TORREGROSSA, Michele"'
Search Results
2. Aerobic granular sludge treating shipboard slop: Analysis of total petroleum hydrocarbons loading rates on performances and stability.
- Author
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Corsino, Santo Fabio, Campo, Riccardo, Di Bella, Gaetano, Torregrossa, Michele, and Viviani, Gaspare
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ACTIVATED sludge process , *BIOREACTORS , *ORGANIC compounds , *OXIDATION-reduction reaction , *FLUIDIZED bed reactors - Abstract
The work focuses on the feasibility of treating slop with aerobic granular sludge. For this purpose, a 3.5 L granular sequencing batch reactor was activated and it was monitored for 156 days. The experimental campaign was divided into two periods, named Period I (100 days) and Period II (56 days). Total Petroleum Hydrocarbon (TPH) concentration in the slop was, on average, equal to 6.8 ± 1.5 mg L −1 and 13 ± 1.5 mg L −1 in Period I and Period II respectively. The obtained results during the first experimental period indicated that about 80 days were required to reach steady state with mature granules, when TPHs removal efficiency was approximately 90%. The results indicated that both adsorption and biodegradation phenomena occurred. Subsequently, due to the increase in the TPH concentration in Period II, a temporary degranulation was observed, leading to the deterioration of effluent quality. When the granulation was recovered, the TPHs removal efficiencies were gradually recovered. Based on the results, the granular sludge appears able to remove hydrocarbons, in compliance the discharge limits, even if a significant deterioration in granular sludge structure was observed with the increase in TPH concentration. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
3. Effect of extended famine conditions on aerobic granular sludge stability in the treatment of brewery wastewater.
- Author
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Corsino, Santo Fabio, di Biase, Alessandro, Devlin, Tanner Ryan, Munz, Giulio, Torregrossa, Michele, and Oleszkiewicz, Jan A.
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WASTEWATER treatment , *FAMINES , *BIOREACTORS , *BREWERY waste , *CHEMICAL oxygen demand - Abstract
Results obtained from three aerobic granular sludge reactors treating brewery wastewater are presented. Reactors were operated for 60 d days in each of the two periods under different cycle duration: (Period I) short 6 h cycle, and (Period II) long 12 h cycle. Organic loading rates (OLR) varying from 0.7 kg COD m −3 d −1 to 4.1 kg COD m −3 d −1 were tested. During Period I, granules successfully developed in all reactors, however, results revealed that the feast and famine periods were not balanced and the granular structure deteriorated and became irregular. During Period II at decreased 12 h cycle time, granules were observed to develop again with superior structural stability compared to the short 6 h cycle time, suggesting that a longer starvation phase enhanced production of proteinaceous EPS. Overall, the extended famine conditions encouraged granule stability, likely because long starvation period favours bacteria capable of storage of energy compounds. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
4. Cultivation of granular sludge with hypersaline oily wastewater.
- Author
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Corsino, Santo Fabio, Campo, Riccardo, Di Bella, Gaetano, Torregrossa, Michele, and Viviani, Gaspare
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BIOLOGICAL nutrient removal , *GRANULATION , *HYDROCARBONS , *BIOREACTORS , *INDUSTRIAL wastes - Abstract
The time required to stabilise mature aerobic granules is rather variable. In addition, cultivation time and the structural characteristics of granules seem to be related to the nature of wastewater influent. Granular sludge has been used for the treatment of several industrial wastewaters, but nothing has been reported about wastewater characterized by the simultaneous presence of hydrocarbons and high chloride concentration. In this work, the authors analysed the granulation process and performance as well as the physical characteristics of aerobic granules in two Granular Sequencing Batch Airlift Reactors (GSBARs), fed with acetate-based synthetic wastewater in reactor 1 (R1) and with a mixture of real and simulated slop (R2). The results obtained in 100 days show that full granulation was achieved in both reactors. The granules in R2 developed more quickly, but they appeared slightly unstable and more susceptible to breaking. Despite high salt concentration, the efficiency of phosphorous and carbon removal was satisfactory. Low nitrification activity was observed in R1, confirming that a longer time is necessary to obtain the acclimation of autotrophic biomass in aerobic granules. In R2 the combined effect of salinity and hydrocarbons caused the inhibition of the autotrophic biomass, with the consequence that nitrification was absent. Hydrocarbons were initially removed by adsorption afterwards by biological degradation with a removal efficiency of over 90%. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
5. Aerobic granular sludge treating anaerobically pretreated brewery wastewater at different loading rates
- Author
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Michele Torregrossa, Giulio Munz, Jan A. Oleszkiewicz, Tanner R. Devlin, Alessandro di Biase, Fabio Santo Corsino, and Di Biase Alessandro, Corsino Santo Fabio, Devlin Tanner Ryan, Torregrossa Michele, Munz Giulio, Oleszkiewicz Jan Alexander
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Environmental Engineering ,Microorganism ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,Wastewater ,01 natural sciences ,Food to microorganism ratio ,Waste Disposal, Fluid ,Granulation ,Brewery wastewater ,Nutrient ,Animal science ,Bioreactors ,020401 chemical engineering ,Nutrient removal ,0204 chemical engineering ,0105 earth and related environmental sciences ,Water Science and Technology ,Settore ICAR/03 - Ingegneria Sanitaria-Ambientale ,Sewage ,Chemistry ,Microbiota ,Performance results ,Aerobiosis ,Microbial population biology ,Aerobic granular sludge ,Aeration ,Carbon ,Organic loading rate - Abstract
In this study, three different aerobic granular sludge (AGS) reactors fed with anaerobically pre-treated brewery wastewater were studied. The AGS reactors were operated under different conditions including organic loading rates (OLR) between 0.8 and 4.1 kg COD m−3 d−1, C:N:P ratios (100:10:1 and 100:6:1) and food to microorganism ratios (F/M) between 0.8 ± 0.6 and 1.2 ± 0.5 and 0.9 ± 0.3 kg-TCOD kg-VSS−1d−1. Stable granulation was achieved within two weeks and the size of the granules increased according to the OLR applied. The results indicated that low C:N:P and F/M ratios were favorable to achieve stable aerobic granules in the long term. The carbon removal rate was load-independent in the range examined (TCOD removal >80%), whereas TN removals were inversely proportional to the OLRs. Overall, a longer aeration reaction time with a lower OLR was beneficial to granular structure, which exhibited a compact and defined architecture. Performance results within the other conditions studied further indicated that the microbial community and its complex functionality in nutrient removal was efficient at operational parameters of OLR at 0.8 ± 0.2 kg-TCOD m−3d−1 and F/M ratio at 0.5 ± 0.2 kg-TCOD VSS−1d−1. Moreover, the protein to polysaccharide ratio increased as OLR decreased, leading to a stable granular structure.
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- 2020
6. Comparison between kinetics of autochthonous marine bacteria in activated sludge and granular sludge systems at different salinity and SRTs
- Author
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Michele Torregrossa, V. Tandoi, Francesca Di Pippo, Santo Fabio Corsino, Marco Capodici, Corsino, Santo Fabio, Capodici, Marco, Di Pippo, Francesca, Tandoi, Valter, and Torregrossa, Michele
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Salinity ,Environmental Engineering ,Autochthonous-halophilic bacteria ,Nitrogen ,0208 environmental biotechnology ,Biomass ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Denitrifying bacteria ,chemistry.chemical_compound ,Nutrient ,Marine bacteriophage ,Bioreactors ,Activated sludge Aerobic granular sludge Autochthonous-halophilic bacteria Shortcut nitrification Saline wastewater ,Ammonium ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Water Science and Technology ,Civil and Structural Engineering ,Settore ICAR/03 - Ingegneria Sanitaria-Ambientale ,Bacteria ,Sewage ,Ecological Modeling ,Pollution ,020801 environmental engineering ,Kinetics ,Activated sludge ,chemistry ,Wastewater ,Aerobic granular sludge ,Environmental chemistry ,Saline wastewater ,Shortcut nitrification - Abstract
Biological nutrient removal performances and kinetics of autochthonous marine biomass in forms of activated sludge and aerobic granular sludge were investigated under different salinity and sludge retention time (SRT). Both the biomasses, cultivated from a fish-canning wastewater, were subjected to stepwise increases in salinity (+2 gNaCl L−1), from 30 gNaCl L−1 up to 50 gNaCl L−1 with the aim to evaluate the maximum potential in withstanding salinity by the autochthonous marine biomass. Microbial marine species belonging to the genus of Cryomorphaceae and of Rhodobacteraceae were found dominant in both the systems at the maximum salinity tested (50 gNaCl L−1). The organic carbon was removed with a yield of approximately 98%, irrespective of the salinity. Similarly, nitrogen removal occurred via nitritation-denitritation and was not affected by salinity. The ammonium utilization rate and the nitrite utilization rate were approximately of 3.60 mgNH4-N gVSS−1h−1 and 10.0 mgNO2-N gVSS−1h−1, respectively, indicating a high activity of nitrifying and denitrifying bacteria. The granulation process did not provide significant improvements in the nutrients removal process likely due to the stepwise salinity increase strategy. Biomass activity and performances resulted affected by long SRT (27 days) due to salt accumulation within the activated sludge flocs and granules. In contrast, a lower SRT (14 days) favoured the discharge of the granules and flocs with higher inert content, thereby enhancing the biomass renewing. The obtained results demonstrated that the use of autochthonous-halophilic bacteria represents a valuable solution for the treatment of high-strength carbon and nitrogen saline wastewater in a wide range of salinity. Besides, the stepwise increase in salinity and the operation at low SRT enabled high metabolic activity and to avoid excessive accumulation of salt within the biomass aggregates, limiting their physical destructuration due to the increase in loosely-bound exopolymers.
- Published
- 2018
7. Aerobic granular sludge treating high strength citrus wastewater: Analysis of pH and organic loading rate effect on kinetics, performance and stability
- Author
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Gaspare Viviani, Michele Torregrossa, Santo Fabio Corsino, Daniele Di Trapani, Corsino, Santo Fabio, Di Trapani, Daniele, Torregrossa, Michele, and Viviani, Gaspare
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Citrus ,Environmental Engineering ,Microorganism ,Segmented filamentous bacteria ,0208 environmental biotechnology ,OLR ,02 engineering and technology ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,Wastewater ,01 natural sciences ,Waste Disposal, Fluid ,Hydrolysis ,Bioreactors ,Effluent ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Citrus wastewater ,Total organic carbon ,Settore ICAR/03 - Ingegneria Sanitaria-Ambientale ,Sewage ,Chemistry ,pH ,Chemical oxygen demand ,General Medicine ,Hydrogen-Ion Concentration ,Pulp and paper industry ,Aerobiosis ,020801 environmental engineering ,Kinetics ,Aerobic granular sludge ,Sewage treatment ,Biokinetic - Abstract
In the present paper, the feasibility of citrus wastewater treatment with aerobic granular sludge sequencing batch reactors (AGSBR) was investigated. Two AGSBRs (named R1 and R2, respectively) were operated for 90 days under different organic loading rates (OLR) and pH in two experimental periods. The OLR ranged approximately between 3.0 kg TCOD m−3d−1 and 7 kg TCOD m−3d−1 during Period I, whereas between 7 kg TCOD m−3d−1 and 15 kg TCOD m−3d−1 during Period II. pH was maintained at 7.0 and 5.5 in R1 and R2, respectively. The results revealed that under high OLR and unbalanced feast/famine regime (Period I), the development of fast-growing microorganisms (fungi and filamentous bacteria) was favoured in both reactors, resulting in granular sludge instability. An extended famine phase and a proper balancing between feast and famine periods (Period II) were favourable for the development of bacteria with low growth rates (0.05 d−1) thus enhancing the granules stability. To the benefit of granular sludge stability and effluent quality, the length of the feast period should not exceed 25% of cycle length. Moreover, under OLR lower than 7 kg TCOD m−3d−1 the removal efficiency of total chemical oxygen demand (TCOD) was approximately 90% in R1 and R2 and no side effects on the organic carbon removal performance related to the pH were observed. In contrast, at higher OLR a significant decrease in the removal efficiency (from 90% to less than 75%) was observed in R2. Results revealed also that under low pH, hydrolysis of proteins occurred and a decrease in the biological kinetic rates proportionally to the applied OLR was observed.
- Published
- 2017
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