Cassava peels & extracts: Performance in a single chamber air cathode microbial fuel cell
Notice bibliographique
Résumé
Microbial fuel cells (MFC) are gaining popularity because of their unique ability to produce electricity from the activity of bacteria on a diverse range of substrates. Several studies have investigated the use of domestic wastewater, winery waste, sewage sludge, starch, and chocolate as substrates in MFCs, with varying degrees of success. While this technology has shown considerable promise for the future of energy production and waste management, much still has to be done with respect to its scaling-up for practical applications. Advances in the optimization of power outputs, MFC construction materials, and in predicting power outputs for scale-up projects further buoy this positive outlook.Cassava (Manihot esculenta Crantz) is a common root crop in the tropics and an important source of sustenance for many people around the world. The processing of this root crop involves, amongst many other steps, the removal of the peel, which is then discarded. More often than not, these peels are left to rot in open spaces close to the processing factories and constitute a nuisance to the environment.In a bid to find a use for this abundant waste, the possibility of serving as substrate to produce electricity in a single chamber MFC with an air cathode was examined. An examination of the microbes present on cassava peels identified rod-shaped gram-positive and cocci-shaped gram-negative bacteria as the dominant microbes growing indigenously on the cassava peels. The exoelectrogenicity of these organisms was determined in a tubular single chamber MFC, operating at an optimal anode-cathode distance of 2.54 cm (1 in). The anode consisted of carbon graphite brushes, while the cathode was a membrane electrode assembly (MEA) carbon cloth assembly, consisting of a gas diffusion layer coated with 60% PtC at 0.5 mg/cm2, with an active area of 10 cm ×10 cm. The maximum output and power density recorded over a 35-day cycle were 450 ± 20 mV and 29 mW/m3 of reactor volume, respectively. Peaking after about 96 h of operation, the system’s power density steadily decreased thereafter. The information and experience gained through this study allowed for the conceptualization of a new, cleaner and more maneuverable system design. Extracts squeezed from cassava peels bearing a 65% moisture content were used for subsequent experiments. At other times, cassava peels or extracts were subjected to different pre-treatments before being loaded into the MFC. In this latter portion of the study, the maximum voltage output recorded was 687 ± 21mV, while the highest calculated power density was 155 mW/m3 of reactor volume after 96 hrs. This was coupled with a high coulombic efficiency (77%). These values were recorded for an extract of 7-day fermented cassava peels, adjusted to pH = 7.63 with Na2CO3. This project is fundamental to further scholarship on the usage of cassava peels or similar agricultural wastes in a microbial fuel cell. It is believed that there are inferences to be taken from this project for the design of a more efficient and scalable process for the usage of such wastes in generating electricity, all in a bid to reduce the damage to the environment that may arise from their indiscriminate disposal.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».