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7. Metal-based flocculation to harvest microalgae: a look beyond separation efficiency

Author

Rossi, S, Visigalli, S, Castillo Cascino, F, Mantovani, M, Mezzanotte, V, Parati, K, Canziani, R, Turolla, A, Ficara, E, Rossi S., Visigalli S., Castillo Cascino F., Mantovani M., Mezzanotte V., Parati K., Canziani R., Turolla A., Ficara E., Rossi, S, Visigalli, S, Castillo Cascino, F, Mantovani, M, Mezzanotte, V, Parati, K, Canziani, R, Turolla, A, Ficara, E, Rossi S., Visigalli S., Castillo Cascino F., Mantovani M., Mezzanotte V., Parati K., Canziani R., Turolla A., and Ficara E.

Abstract

Metal-based flocculants are commonly used for biomass harvesting in microalgae-based bio-refineries. Besides the high separation efficiency, additional aspects should be considered, related to the toxicity of metals for the algal biomass. Partitioning tests for commonly used flocculants (i.e., FeCl3 and Al2(SO4)3) showed that metals were mostly transferred to the solid phase with more than 95% of dosed metal ending up into the biomass, and low metal concentrations in the liquid effluent (lower than 0.4 mg L−1 for both metals), thus allowing for water reuse. Photosynthesis inhibition was tested on microalgae and microalgae-bacteria cultures, using a standardized photo-respirometry protocol in which typical concentrations used during coagulation-flocculation were assessed. Modelling dose-response curves, concentrations corresponding to 50% inhibition (IC50) were obtained, describing short-term effects. The obtained IC50 ranged from 13.7 to 28.3 mg Al L−1 for Al, and from 127.9 to 195.8 mg Fe L−1 for Fe, showing a higher toxicity for the Al-based flocculant. The recovery of photosynthesis inhibition was also quantified, to evaluate the possibility of reusing/recycling the harvested biomass. The results highlighted that the residual photosynthetic activities, evaluated after 1 h and 24 h of exposure to metals were partially recovered, especially for Al, passing from 67.3% to 94.6% activity, respectively, while long-term Fe effects were stronger (passing from 64.9% to 77.6% activity). A non-toxic flocculant (cationic starch) was finally tested, excluding potential effects due to biomass aggregation, as the reduction of photosynthetic activity only reached 3.4%, compared to control. Relevant modifications to the light availability and the optical properties of algal suspensions were assessed, identifying a strong effect of iron which caused an increase of the light absorbance up to approximately 40% at high Fe concentrations. Possible implications of dosing metallic flocc

Published
2021

8. Assessment of anammox, microalgae and white-rot fungi-based processes for the treatment of textile wastewater

Author

Bellucci, M, Marazzi, F, Musatti, A, Fornaroli, R, Turolla, A, Visigalli, S, Bargna, M, Bergna, G, Canziani, R, Mezzanotte, V, Rollini, M, Ficara, E, Bellucci M., Marazzi F., Musatti A., Fornaroli R., Turolla A., Visigalli S., Bargna M., Bergna G., Canziani R., Mezzanotte V., Rollini M., Ficara E., Bellucci, M, Marazzi, F, Musatti, A, Fornaroli, R, Turolla, A, Visigalli, S, Bargna, M, Bergna, G, Canziani, R, Mezzanotte, V, Rollini, M, Ficara, E, Bellucci M., Marazzi F., Musatti A., Fornaroli R., Turolla A., Visigalli S., Bargna M., Bergna G., Canziani R., Mezzanotte V., Rollini M., and Ficara E.

Abstract

The treatability of seven wastewater samples generated by a textile digital printing industry was evaluated by employing 1) anammox-based processes for nitrogen removal 2) microalgae (Chlorella vulgaris) for nutrient uptake and biomass production 3) white-rot fungi (Pleurotus ostreatus and Phanerochaete chrysosporium) for decolorization and laccase activity. The biodegradative potential of each type of organism was determined in batch tests and correlated with the main characteristics of the textile wastewaters through statistical analyses. The maximum specific anammox activity ranged between 0.1 and 0.2 g N g VSS-1 d-1 depending on the sample of wastewater; the photosynthetic efficiency of the microalgae decreased up to 50% during the first 24 hours of contact with the textile wastewaters, but it improved from then on; Pleurotus ostreatus synthetized laccases and removed between 20-62% of the colour after 14 days, while the enzymatic activity of Phanerochaete chrysosporium was inhibited. Overall, the findings suggest that all microbes have great potential for the treatment and valorisation of textile wastewater after tailored adaptation phases. Yet, the depurative efficiency can be probably enhanced by combining the different processes in sequence.

Published
2021

12. Il progetto LIFE DeNTreat: rimozione autotrofa dell’azoto nei reflui da stampa tessile digitale con processo PN/A

Author

Visigalli, S., Turolla, A., Rigamonti, Lucia, Bellucci, M., Menin, G., Silva, A., Bargna, M., Bergna, G., and Canziani, R.

Subjects
nitrogen removal, nitritazione parziale, Anammox, nitritazione parziale, reflui concentrati, rimozione azoto, stampa tessile digitale, Anammox, partial nitritation, digital textile printing, reflui concentrati, concentrated wastewater, Anammox, concentrated wastewater, digital textile printing, nitrogen removal, partial nitritation, rimozione azoto, stampa tessile digitale
Published
2021

13. La disidratazione elettro-assistita dei fanghi: influenza del dosaggio di polielettrolita e dei parametri operativi

Author

Visigalli, S., Turolla, A., Zhang, H., Gronchi, P., and Canziani, R.

Subjects
fanghi di depurazione, disidratazione, sewage sludge, sewage sludge, dewatering, electro-dewatering, energy consumptions, costs, costi, costs, electro-dewatering, energy consumptions, consumo energetico, fanghi di depurazione, disidratazione, disidratazione elettro-assistita, consumo energetico, costi, dewatering, disidratazione elettro-assistita
Published
2018

29. Removal of pesticides by a combined ozonation/attached biomass process sequence

Author

Mezzanotte, V, Canziani, R, Sardi, E, Spada, L, MEZZANOTTE, VALERIA FEDERICA MARIA, Spada, L., Mezzanotte, V, Canziani, R, Sardi, E, Spada, L, MEZZANOTTE, VALERIA FEDERICA MARIA, and Spada, L.

Abstract

Different combinations of ozonation and biological treatments were tested on an industrial effluent containing high pesticide concentrations. Ozonation was performed in 450 L columns at 1.5 h HRT each. Biological treatment was carried out in a submerged filter (BIOFOR). Ozone was effective in removing herbicides but dosages up to 1000 mg L-1. were needed. The improved biodegradability of the organic compounds after pre-ozonation was demonstrated by Oxygen Uptake Rates (OUR) tests and by the efficiency of biological treatment towards COD, and pesticides. The Italian discharge limit of 50 ppb total pesticides was achieved by combining pre-ozonation, biological treatment, and post-ozonation.

Published
2005

39. MEDICAL SCIENCE. GISSI-2: A factorial randomised trial of alteplase versus streptokinase and heparin versus no heparin among 12 490 patients with acute myocardial infarction

Author

Feruglio, G. A., Lotto, A., Rovelli, F., Solinas, P., Tavazzi, L., Tognoni, G., De Vita, C., Franzosi, M. G., Maggiom, A. P., Mauri, F., Volpi, A., Selvini, A., Donato, L., Garattmi, S., Loi, U., Sirchia, G., Ambrosioni, E., Camerini, F., Campolo, L., Donati, M. B., Ferrari, M., Farchi, G., Geraci, E., Mannucci, P. M., Marubini, E., Neri Semeri, G. G., Peto, R., Prati, P. L., Specchia, G., Vecchio, C., Visani, L., Yusuf, S., Mezzanotte, G., Santoro, E., Bruno, M., Cappello, T., Coppini, A., Fincati, F., Mantovani, G., Pangrazzi, J., Pogna, M., Turazza, F. M., Ansehni, M., Barbonaglia, L., Bigi, R., Cavalli, A., Frigerio, M., Giordano, A., Gualtierotti, C., Torta, D., Vinci, P., Bossi, M., Furlanello, F., Braito, E., Giulia, V., Palmieri, M., Majoimo, P., Pinelli, G., Papi, L., Nardelli, A., Capestro, F., Rossi, A., Ricci, D., Mininni, N., Bianco, G., Barbuzzi, S., Plastina, F., Di Giovanna, F., Mereu, D., Giordano, F., Barlotti, R., Loparco, G., Boscarino, S., Ruggeri, G., Anastasi, R., Paciaroni, E., Tomassini, P. F., Purcaro, A., Francesconi, M., Figliolia, S., Tesse, S., Devoti, G., Giometti, R., Teoni, P., Burali, A., Zucconelli, V., Iervoglini, A., Amabili, S., Caratti, C. A., Zola, G., Ferraguto, P., Sagci, G., Rotiroti, D., Genovese, M., Da€™amato, N., Taurino, L., Colonna, L., Bovenzi, F., Messina, D., Sarcina, G., Compostella, L., Cucchini, F., Malacrida, R., Gradel, C., Bridda, A., Pellegrini, P., Acone, L., Bruno, A., Tespili, M., Guaghurrii, G., Casari, A., Bobba, F., Scaramuzzino, G., Berardi, C., De Castro, U., Fulvi, M., Lintner, W., Erlicher, A., Pitscheider, W., Scola Gagliardi, R., Bonizzato, G., Roggero, C., Perrini, A., Tsialtas, D., Straneo, U., Storelli, A., Verrienti, A., Albonico, B., Corradi, L., De Petra, V., Villani, C., Maxia, P., Bianco, A., Crabu, E., Centamore, G., Di Stefano, G., Vancheri, F., Amico, C., Baldini, F., Santopuoli, G., Pantaleoni, A., Contessotto, F., Terlizzi, R., Turchi, E., Teglio, V., Pignatti, F., Aletto, C., Gozzelino, G., Pettinati, G., De Santis, F., Correale, E., Romano, S., Perrotta, R., Tritto, C., May, L., Achilli, G., Suzzi, G., Cemetti, C., Longobardi, R., Somma, G., Palumbo, C., Gallone, P., Sorrentino, F., Dato, A., Della Monica, R., Pagano, L., Alberti, A., Orselli, L., Negrini, M., De Ponti, C., Acito, P., Capelletti, D., Bortolini, F., Coppola, V., Ciglia, C., De Cesare, M., De Lio, U., Maiolino, P., Giannini, R., Niccolini, A., Marinoni, C., Guasconi, C., Sonnino, S., Pagliei, M., Ferrari, G., Politi, A., Galli, M., De Rinaldis, G., Calcagnile, A., Bendinelli, S., Lusetti, L., Mollaioli, M., Cosmi, F., Venneri, N., Feraco, E., Lauro, A., Catelli, P., Poluzzi, C., Distante, S., Pedroni, P., Zampaglione, G., Lumare, R., Bruna, C., De Benedictis, N., Ziacchi, V., Lomanto, B., Riva, D., Bertocchi, P., Tirella, G., Tessitori, M., Bini, A., Peruzzi, F., Maresta, A., Pirazzini, L., Gaggi, S., Frausini, G., Malacame, C., Codeca, L., Cappato, R., Andreoli, L., Bastoni, L. A., Pucci, P., Sarro, F., Vergassola, R., Barchielli, M., De Matteis, D., Carrone, M., Liberati, R., Meniconi, L., Radogna, M., Tallone, M., Ieri, A., Ferreri, A., Guidali, P., Canziani, R., Mariello, F., Minelli, C., Muzio, L., Rota Baldini, M., Lupi, G., Cecchi, A., Giuliano, G., Bellotti, S., Livi, S., Corti, E., Rossi, P., Delfino, R., Iannetti, M., Pastorini, C., Pennesi, A., Di Giacinto, N., Bertolo, L., Slomp, L., Cresti, A., Svetoni, N., Distefano, S., Veneri, L., Moretti, S., Palermo, R., Giovanelli, N., Parchi, C., Dethomads, M., Paparella, N., Carrino, C., Aquaro, G., Idone, P., Marsili, P., Sideri, F., Valerio, A., Tullio, D., Ragazzini, G., Gramenzi, S., De Pasquale, B., Gelfo, P. G., Rosselli, P., De Marchi, E., Greco, M. R., Fazio, A. M., Savoia, M. T., Gerosa, C., Barbiero, M., Barbaresi, F., Volta, G., Da€™urbano, M., Passoni, F., Parola, G., Lanzini, A., Baldini, U., Del Bene, P., Orlandi, M., Oddone, A., Lazzari, M., Ballerini, B., Bozzi, L., Moccetti, T., Bemasconi, E., Sanguinetti, M., Tognoli, T., Bardelli, G., Maggi, A., Turato, R., Piva, M., Izzo, A., Tantalo, L., Rizzi, A., Scilabra, G., Varvaro, F., Colombo, G., Grieco, A., Dovico, E., Belluzzi, F., Casellato, F., Lecchi, G., Maugeri Sacci, C., Consolo, A., Piccolo, E., Zuin, G., Zappa, C., Sanna, G. P., Dossena, M. G., Corsini, C., Lettino, M., Marconi, M., Mafrici, A., Leonardi, G., Moreo, A., Seregni, R., Pastine, I., Casazza, F., Regalia, F., Maggiolini, S., Benenati, P. M., Rigo, R., Pascotto, P., Zanocco, A., Artusi, L., Cappelli, C., Bernardi, C., Pahnieri, M., Zilio, G., Sandri, R., Neri, G., Valagussa, F., Osculati, G., Cira, A., Da€™aniello, L., Piantadosi, F. R., Improta, M., Severino, S., Bisconti, C., Mostacci, M., Randon, L., Boschello, M., Allegri, M., Freggiaro, V., Mureddu, V., Soro, F., Marras, E., Marchi, S. M., De Luca, C., Manetta, M., Dalla Volta, S., Maddalena, F., Donzelli, M., Vitrano, M. G., Canonico, A., Ledda, A., Bellomare, D., Carrubba, A., Da€™antonio, E., Scardulla, C., Raineri, A., Traina, M., La Calce, C., Cirincione, V., Montanar, F., Strizzolo, L., Di Gregorio, D., Mantini, L., Chiriatti, G., Gazzola, U., Rosi, A., Mellini, M., Piazza, R., Micheli, G., Bechi, S., Martines, C., Marchese, D., Bigalli, A., Davini, P., Boem, A., Del Citerna, F., Giomi, A., Codeluppi, P., Negrelli, M., Brieda, M., Charmet, P. A., Petrella, A., Bardazzi, L., Bianco, G. A., Marco, A., Licitra, R., Lettica, G. V., Tumiotto, G., Bosi, S., Spitali, G., Casali, G., Bottoni, N., Parenti, G. F., Triulzi, E., Brighi, F., Benati, A., De Sanctis, A., Mene, A., Pesaresi, A., Bologna, F., Lumia, F., Barbato, G., Milazzotto, F., Proietti, F., Angrisani, G., Azzolini, P., Coppola, E., Trani, Carlo, Masini, V., Rocchi, M., Borgia, M. C., Luciani, C., Vitucci, N. C., Giuliani, P., Tugnoli, F., Vetta, C., Altieri, T., Gimigliano, F., Striano, U., Salituri, S., Zanazzi, G., Zonzin, P., Bugatti, U., Ravera, B., Allemano, P., Reynaud, S., Sanson, A., Milani, L., De Simone, M. V., Villella, A., Grazzini, M., Amidei, S., Ansehni, L., Benza, G., Tagliamonte, A., Messina, V., Etro, M. D., Vivaldi, F., Cortese, R., Ibba, G. V., Sannia, L., Pedrazzini, F., Gazzotti, G. L., Pizzuti, A., Antonielli, E., Becchi, G., Filice, A., Salmoiraghi, A., Caramanno, G., Caporicci, D., Brun, M., Ferrario, G., Giani, P., Ronconi, G., Douglas, S., Bianchi, C., Cucchi, G., Marieni, M., Marcellini, G., Speca, G., Beato, E., Serabni, N., Bazzucchi, M., Coronelli, R., Rossi, L., Basso, G., Presbitero, P., Bevilacqua, R., Pallisco, O., Di Leo, M., Golzio, P. G., Parigi, A., Belli, R., Trinchero, R., Gaschino, G., Barenghi, M., Poggio, G. L., Braschi, G. B., Sciacca, R., Sammartano, A., Braito, G., Cuzzato, V., Frigo, G., Perissinono, F., Galati, A., Accogli, M., Morgera, T., Barbieri, L., Slavich, G. A., Fresco, C., Cuda, A., Liguori, A., Cozzi, A., Caico, S., Alberio, M., Di Marco, G., De Vito, G., Valente, S., Zagatti, G., Zardini, P., Nidasio, G. P., Girardi, P., Mazzini, C., Nava, S., Achilli, A., Bisogno, A., Pasotti, C., Ballestra, A. M., and Giustarini, C.

Subjects
Aspirin, medicine.medical_specialty, business.industry, Streptokinase, acute myocardial infarction, General Medicine, Heparin, medicine.disease, Atenolol, Surgery, Anistreplase, Anesthesia, Settore MED/11 - MALATTIE DELL'APPARATO CARDIOVASCOLARE, medicine, Myocardial infarction, business, Stroke, medicine.drug, Killip class
Abstract

A multicentre, randomised, open trial with a 2 x 2 factorial design was conducted to compare the benefits and risks of two thrombolytic agents, streptokinase (SK, 1·5 MU infused intravenously over 30-60 min) and alteplase (tPA, 100 mg infused intravenously over 3 h) in patients with acute myocardial infarction admitted to coronary care units within 6 h from onset of symptoms. The patients were also randomised to receive heparin (12 500 U subcutaneously twice daily until discharge from hospital, starting 12 h after beginning the tPA or SK infusion) or usual therapy. All patients without specific contraindications were given atenolol (5-10 mg iv) and aspirin (300-325 mg a day). The end-point of the study was the combined estimate of death plus severe left ventricular damage. 12 490 patients were randomised to four treatment groups (SK alone, SK plus heparin, tPA alone, tPA plus heparin). No specific differences between the two thrombolytic agents were detected as regards the combined end-point (tPA 23·1%; SK 22·5%; relative risk 1·04, 95% Cl 0·95-1·13), nor after the addition of heparin to the aspirin treatment (hep 22·7%, no hep 22·9%; RR 0·99, 95% Cl 0·91-1·08). The outcome of patients allocated to the four treatment groups was similar with respect to baseline risk factors such as age, Killip class, hours from onset of symptoms, and site and type of infarct. The rates of major in-hospital cardiac complications (reinfarction, post-infarction angina) were also similar. The incidence of major bleeds was significantly higher in SK and heparin treated patients (respectively, tPA 0·5%, SK 1·0%, RR 0·57, 95% Cl 0·38-0·85; hep 1·0%, no hep 0·6%, RR 1·64, 95% Cl 1·09-2·45), whereas the overall incidence of stroke was similar in all groups. SK and tPA appear equally effective and safe for use in routine conditions of care, in all infarct patients who have no contraindications, with or without post-thrombolytic heparin treatment. The 8·8% hospital mortality of the study population (compared with approximately 13% in the control cohort of the GISSI-1 trial) indicates the beneficial impact of the proven acute treatments for AMI.

Published
1990

50. Low temperature microwave and conventional heating pre-treatments to improve sludge anaerobic biodegradability.

Author

Vergine, P., Zábranská, J., and Canziani, R.

Subjects
LOW temperatures, SEWAGE sludge, CHEMICAL oxygen demand, MICROWAVE heating, DIRECT energy conversion, ANAEROBIC digestion
Abstract

This paper presents the results of lab-scale experiments on low temperature thermal pre-treatment (less than 100 WC) prior to anaerobic digestion of sewage sludge. Two heating ways, microwave heating (MH) and conventional heating (CH), and two types of sludge, primary and waste activated sludge, were compared under the same experimental conditions. The degree of solubilisation produced by MH and CH up to 72, 82 and 93 WC was firstly estimated. For both types of heating, increase in soluble chemical oxygen demand (COD) caused by the pre-treatment was about 14% on waste activated sludge and only 3% on primary sludge. The final temperature of 72 WC resulted as the most cost-effective in terms of additional soluble COD per unit of energy required. Subsequently, five series of biochemical methane potential mesophilic assays were run in 120 mL serum bottles on sludge samples pre-treated at 72 WC. When compared with control reaction vessels, no significant differences were noticed in net methane production of pre-treated primary sludge, whereas a relevant increase occurred regarding the pre-treated waste activated sludge. It was also observed that the trend of methane content in biogas during the batch tests can be described by a second order polynomial. [ABSTRACT FROM AUTHOR]

Published
2014
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