Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions
Experimental trials of anaerobic digestion of olive mill wastewater (OMW) blended with other agro-industrial by-products were carried out to evaluate biogas production and sensitivity of the process to inhibiting compounds. Blends containing different percentages of OMW, digested liquid manure, and...
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| Format: | Article |
| Language: | English |
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PAGEPress Publications
2018-02-01
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| Series: | Journal of Agricultural Engineering |
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| Online Access: | https://www.agroengineering.org/index.php/jae/article/view/792 |
| _version_ | 1818161624240881664 |
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| author | Demetrio Antonio Zema Giovanni Zappia Souraya Benalia Giuseppe Zimbalatti Enzo Perri Elena Urso Vincenzo Tamburino Bruno Bernardi |
| author_facet | Demetrio Antonio Zema Giovanni Zappia Souraya Benalia Giuseppe Zimbalatti Enzo Perri Elena Urso Vincenzo Tamburino Bruno Bernardi |
| author_sort | Demetrio Antonio Zema |
| collection | DOAJ |
| description | Experimental trials of anaerobic digestion of olive mill wastewater (OMW) blended with other agro-industrial by-products were carried out to evaluate biogas production and sensitivity of the process to inhibiting compounds. Blends containing different percentages of OMW, digested liquid manure, and citrus peel were subjected to a batch anaerobic digestion process under both mesophilic and thermophilic conditions. The results showed that blends with percentages of OMW higher than 20% (v/v) had low methane yields due high concentrations of polyphenols (PPs) and/or volatile fatty acids (concentrations above 0.8 g kg–1 and 2.4 g L–1, respectively). The addition of other substrates such as citrus peel may have induced synergic inhibiting effects of PPs and essential oils (EO) on microbial growth. Thermophilic processes were more sensitive to these inhibiting compounds than mesophilic processes. The results of this study suggest that reducing PPs and EO concentrations in blends subject to anaerobic digestion below the inhibiting concentrations of 0.6 g L–1 and 0.5 g kg–1, respectively, is suitable. Additionally, it is advisable to maintain the volatile fatty acids content below 2 g L–1 to avoid its evident toxic effects on the growth of microorganisms in biochemical processes. |
| first_indexed | 2024-12-11T16:20:44Z |
| format | Article |
| id | doaj.art-7e8523ef292e4de895259583da09d64b |
| institution | Directory Open Access Journal |
| issn | 1974-7071 2239-6268 |
| language | English |
| last_indexed | 2024-12-11T16:20:44Z |
| publishDate | 2018-02-01 |
| publisher | PAGEPress Publications |
| record_format | Article |
| series | Journal of Agricultural Engineering |
| spelling | doaj.art-7e8523ef292e4de895259583da09d64b2022-12-22T00:58:51ZengPAGEPress PublicationsJournal of Agricultural Engineering1974-70712239-62682018-02-0149213013710.4081/jae.2018.792484Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditionsDemetrio Antonio Zema0Giovanni Zappia1Souraya Benalia2Giuseppe Zimbalatti3Enzo Perri4Elena Urso5Vincenzo Tamburino6Bruno Bernardi7Dipartimento di Agraria, Università degli Studi Mediterranea di Reggio Calabria, Reggio CalabriaDipartimento di Agraria, Università degli Studi Mediterranea di Reggio Calabria, Reggio CalabriaDipartimento di Agraria, Università degli Studi Mediterranea di Reggio Calabria, Reggio CalabriaDipartimento di Agraria, Università degli Studi Mediterranea di Reggio Calabria, Reggio CalabriaCentro di ricerca per l’olivicoltura e l’industria olearia (CREA-OLI), Rende (CS)Centro di ricerca per l’olivicoltura e l’industria olearia (CREA-OLI), Rende (CS)Dipartimento di Agraria, Università degli Studi Mediterranea di Reggio Calabria, Reggio CalabriaDipartimento di Agraria, Università degli Studi Mediterranea di Reggio Calabria, Reggio CalabriaExperimental trials of anaerobic digestion of olive mill wastewater (OMW) blended with other agro-industrial by-products were carried out to evaluate biogas production and sensitivity of the process to inhibiting compounds. Blends containing different percentages of OMW, digested liquid manure, and citrus peel were subjected to a batch anaerobic digestion process under both mesophilic and thermophilic conditions. The results showed that blends with percentages of OMW higher than 20% (v/v) had low methane yields due high concentrations of polyphenols (PPs) and/or volatile fatty acids (concentrations above 0.8 g kg–1 and 2.4 g L–1, respectively). The addition of other substrates such as citrus peel may have induced synergic inhibiting effects of PPs and essential oils (EO) on microbial growth. Thermophilic processes were more sensitive to these inhibiting compounds than mesophilic processes. The results of this study suggest that reducing PPs and EO concentrations in blends subject to anaerobic digestion below the inhibiting concentrations of 0.6 g L–1 and 0.5 g kg–1, respectively, is suitable. Additionally, it is advisable to maintain the volatile fatty acids content below 2 g L–1 to avoid its evident toxic effects on the growth of microorganisms in biochemical processes.https://www.agroengineering.org/index.php/jae/article/view/792Agro-industrial by-productanaerobic digestionbiogasinhibiting compoundsmethane yieldpolyphenols. |
| spellingShingle | Demetrio Antonio Zema Giovanni Zappia Souraya Benalia Giuseppe Zimbalatti Enzo Perri Elena Urso Vincenzo Tamburino Bruno Bernardi Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions Journal of Agricultural Engineering Agro-industrial by-product anaerobic digestion biogas inhibiting compounds methane yield polyphenols. |
| title | Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions |
| title_full | Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions |
| title_fullStr | Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions |
| title_full_unstemmed | Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions |
| title_short | Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions |
| title_sort | limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions |
| topic | Agro-industrial by-product anaerobic digestion biogas inhibiting compounds methane yield polyphenols. |
| url | https://www.agroengineering.org/index.php/jae/article/view/792 |
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