Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion
In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate,...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Tsigkou, Konstantina [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2020transfer abstract |
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| Schlagwörter: |
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| Umfang: |
10 |
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| Übergeordnetes Werk: |
Enthalten in: Technologies and practice of CO - HU, Yongle ELSEVIER, 2019, an international journal : the official journal of WREN, The World Renewable Energy Network, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:147 ; year:2020 ; pages:610-619 ; extent:10 |
| Links: |
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| DOI / URN: |
10.1016/j.renene.2019.09.028 |
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ELV048648051 |
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| 245 | 1 | 0 | |a Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion |
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| 520 | |a In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. | ||
| 520 | |a In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. | ||
| 650 | 7 | |a Anaerobic co-digestion |2 Elsevier | |
| 650 | 7 | |a Two-stage system |2 Elsevier | |
| 650 | 7 | |a Disposable nappies |2 Elsevier | |
| 650 | 7 | |a Biohydrogen |2 Elsevier | |
| 650 | 7 | |a Biogas |2 Elsevier | |
| 650 | 7 | |a Expired food products |2 Elsevier | |
| 700 | 1 | |a Tsafrakidou, Panagiota |4 oth | |
| 700 | 1 | |a Kopsahelis, Alexandros |4 oth | |
| 700 | 1 | |a Zagklis, Dimitris |4 oth | |
| 700 | 1 | |a Zafiri, Constantina |4 oth | |
| 700 | 1 | |a Kornaros, Michael |4 oth | |
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10.1016/j.renene.2019.09.028 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV048648051 (ELSEVIER)S0960-1481(19)31358-8 DE-627 ger DE-627 rakwb eng Tsigkou, Konstantina verfasserin aut Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion 2020transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. Anaerobic co-digestion Elsevier Two-stage system Elsevier Disposable nappies Elsevier Biohydrogen Elsevier Biogas Elsevier Expired food products Elsevier Tsafrakidou, Panagiota oth Kopsahelis, Alexandros oth Zagklis, Dimitris oth Zafiri, Constantina oth Kornaros, Michael oth Enthalten in Elsevier Science HU, Yongle ELSEVIER Technologies and practice of CO 2019 an international journal : the official journal of WREN, The World Renewable Energy Network Amsterdam [u.a.] (DE-627)ELV002723662 volume:147 year:2020 pages:610-619 extent:10 https://doi.org/10.1016/j.renene.2019.09.028 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 147 2020 610-619 10 |
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10.1016/j.renene.2019.09.028 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV048648051 (ELSEVIER)S0960-1481(19)31358-8 DE-627 ger DE-627 rakwb eng Tsigkou, Konstantina verfasserin aut Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion 2020transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. Anaerobic co-digestion Elsevier Two-stage system Elsevier Disposable nappies Elsevier Biohydrogen Elsevier Biogas Elsevier Expired food products Elsevier Tsafrakidou, Panagiota oth Kopsahelis, Alexandros oth Zagklis, Dimitris oth Zafiri, Constantina oth Kornaros, Michael oth Enthalten in Elsevier Science HU, Yongle ELSEVIER Technologies and practice of CO 2019 an international journal : the official journal of WREN, The World Renewable Energy Network Amsterdam [u.a.] (DE-627)ELV002723662 volume:147 year:2020 pages:610-619 extent:10 https://doi.org/10.1016/j.renene.2019.09.028 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 147 2020 610-619 10 |
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10.1016/j.renene.2019.09.028 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV048648051 (ELSEVIER)S0960-1481(19)31358-8 DE-627 ger DE-627 rakwb eng Tsigkou, Konstantina verfasserin aut Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion 2020transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. Anaerobic co-digestion Elsevier Two-stage system Elsevier Disposable nappies Elsevier Biohydrogen Elsevier Biogas Elsevier Expired food products Elsevier Tsafrakidou, Panagiota oth Kopsahelis, Alexandros oth Zagklis, Dimitris oth Zafiri, Constantina oth Kornaros, Michael oth Enthalten in Elsevier Science HU, Yongle ELSEVIER Technologies and practice of CO 2019 an international journal : the official journal of WREN, The World Renewable Energy Network Amsterdam [u.a.] (DE-627)ELV002723662 volume:147 year:2020 pages:610-619 extent:10 https://doi.org/10.1016/j.renene.2019.09.028 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 147 2020 610-619 10 |
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10.1016/j.renene.2019.09.028 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV048648051 (ELSEVIER)S0960-1481(19)31358-8 DE-627 ger DE-627 rakwb eng Tsigkou, Konstantina verfasserin aut Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion 2020transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. Anaerobic co-digestion Elsevier Two-stage system Elsevier Disposable nappies Elsevier Biohydrogen Elsevier Biogas Elsevier Expired food products Elsevier Tsafrakidou, Panagiota oth Kopsahelis, Alexandros oth Zagklis, Dimitris oth Zafiri, Constantina oth Kornaros, Michael oth Enthalten in Elsevier Science HU, Yongle ELSEVIER Technologies and practice of CO 2019 an international journal : the official journal of WREN, The World Renewable Energy Network Amsterdam [u.a.] (DE-627)ELV002723662 volume:147 year:2020 pages:610-619 extent:10 https://doi.org/10.1016/j.renene.2019.09.028 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 147 2020 610-619 10 |
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10.1016/j.renene.2019.09.028 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV048648051 (ELSEVIER)S0960-1481(19)31358-8 DE-627 ger DE-627 rakwb eng Tsigkou, Konstantina verfasserin aut Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion 2020transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. Anaerobic co-digestion Elsevier Two-stage system Elsevier Disposable nappies Elsevier Biohydrogen Elsevier Biogas Elsevier Expired food products Elsevier Tsafrakidou, Panagiota oth Kopsahelis, Alexandros oth Zagklis, Dimitris oth Zafiri, Constantina oth Kornaros, Michael oth Enthalten in Elsevier Science HU, Yongle ELSEVIER Technologies and practice of CO 2019 an international journal : the official journal of WREN, The World Renewable Energy Network Amsterdam [u.a.] (DE-627)ELV002723662 volume:147 year:2020 pages:610-619 extent:10 https://doi.org/10.1016/j.renene.2019.09.028 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 147 2020 610-619 10 |
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Tsigkou, Konstantina @@aut@@ Tsafrakidou, Panagiota @@oth@@ Kopsahelis, Alexandros @@oth@@ Zagklis, Dimitris @@oth@@ Zafiri, Constantina @@oth@@ Kornaros, Michael @@oth@@ |
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used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion |
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Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion |
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In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. |
| abstractGer |
In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. |
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In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%. |
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