Hydrogen photo-production by means of non-sulfur photosynthetic bacteria using three different growth strategies
| Autor: | Sigita Vaiciulyte, Giulia Padovani, Cristina Pintucci, Jolanta Kostkeviciene, Pietro Carlozzi |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | BEC 2012-Bioprocess Engineering Course, Isola di Brac, Croazia, 2-8 settembre 2012 info:cnr-pdr/source/autori:Sigita Vaiciulyte, Giulia Padovani, Cristina Pintucci, Jolanta Kostkeviciene, Pietro Carlozzi/congresso_nome:BEC 2012-Bioprocess Engineering Course/congresso_luogo:Isola di Brac, Croazia/congresso_data:2-8 settembre 2012/anno:2012/pagina_da:/pagina_a:/intervallo_pagine |
| Popis: | Renewable energy sources, such as H2, are a realistic alternative technology to fossil fuels. Hydrogen has been recognized as a promising energy carrier of the future because it is clean, recyclable, and efficient [1]. In spite of several benefits achievable from a green economy, biohydrogen technologies are still in their infancy. Many scientists investigated the photo-fermentation process for the production of hydrogen by means of non-sulfur photosynthetic bacteria (NSPB) [2, 3], and over the years, different growth strategies for enhancing the hydrogen production yield have been proposed [4]. In the current study, we investigated three different strategies of growth for the production of biohydrogen: (i) batch growth; (ii) fed-batch operation and (iii) semi-continuous regime. Experiments were carried out indoors using R. palustris sp. as NSPB, under a continuous light of 200 ?E/m2/s, at 30 °C using two different cylindrical photobioreactors: PBR-1, with a working volume of 1070 mL and an internal diameter (i.d.) of 9.6 cm, and PBR-2, with a working volume of 220 mL and an i.d. of 4.0 cm. The investigation demonstrated that the photobioreactor with the i.d. of 4.0 cm obtained higher performances than the one with the i.d. of 9.6 cm. In fact, the production of hydrogen achievable by means of a photo-fermentative process can be increased significantly by growing it in a cylindrical photobioreactor with an i.d. of 4.0 cm. Under batch growth conditions, we obtained the cumulative hydrogen volumes of 1502 mL/L and 2644 mL/L respectively. The results were in agreement with those reported in a previous study [5]. When the photobioreactor with i.d. of 4.0 cm was operated under fed-batch growth, the hydrogen photo-production increased. Over a time of 672 hours, the total hydrogen volume produced by PBR-2 was about two times higher than that accumulated in the other with i.d. of 9.6 cm. When the photobioreactors (PBR-1 and PBR-2) were operated under a semi-continuous regime with a dilution rate (?d) of 0.1 day-1, the daily hydrogen production rates were 87.4 ± 9.1 mL/L/day and 213 ± 20 mL/L/day respectively. |
| Databáze: | OpenAIRE |
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