Phosphorus removal and flow maximization in the Kamloops rapid infiltration system
Notice bibliographique
Résumé
A proposal concerning its rapid infiltration system at the wastewater treatment plant was submitted to and accepted by the City of Kamloops. A project was therefore undertaken to study the basins as they currently operate as well as how they have done so in the past. To date, only half of the design throughput is realized by the basins. Also to be examined was the phosphorus removal capability of the basin sand, in the hope that it would be sufficient to cease or curtail the practice of chemical phosphorus removal using alum. The phosphorus removal capability of the sand was studied by means of a number of column tests performed using influents of varying phosphorus concentrations. The columns were packed with basin sand of varying depths. An appropriate sand depth and influent phosphorus concentration were chosen as a result of the column tests. It was concluded that a depth of 120 cm and an influent phosphorus concentration of approximately 3.5 mg/L were suitable for further testing. These subsequent experiments revealed that this influent P concentration can only be adopted if accompanied by substantial changes to the current system. These changes include either the occasional re-routing of basin effluent to spray-irrigation or the expansion of the wetlands pilot project. To ensure the propriety of the recommended changes which resulted from the column tests, numerous analyses were performed on the RI basins. It was discovered that the basins have saturated flow; the flow was previously assumed to be unsaturated and therefore all throughput problems had always been linked to surface phenomena. This change in outlook with respect to basin operation allows for a number of alterations to be made. It is recommended that the current sand depth of 220 cm be reduced by 100 cm to 120 cm. This decrease in sand depth will decrease flow resistance by 45%; the accompagnying increase in head will further increase the throughput capability. A discrepancy between in-situ permeability (0.5 x 10⁻⁵ m/s on average) and design permeability (5 x 10⁻⁵ m/s) was discovered and attributed to an error in basin construction. This information changes the view thus far maintained that the basins have never worked according to their design; this can now be altered by substituting the actual permeability for the design permeability into performance expectations. Differences in throughput between the east and west basins, which have always been evident, are attributed to a difference in surface area between the basins and to a small difference in permeability. The west basin is 21% larger than the east. Finally, it was discovered that the basins are indeed capable of removing and retaining phosphorus from wastewater, as was seen by analyzing historical basin data. Most of this retention occurs in the organic-rich surface layer. This result further supports the cutting away of 1 m of sand, since phosphorus removal does not depend on depth. More importantly, this straitforward fact implies that the RI basins are a worthwhile process within the Kamloops treatment plant. Included in the report are numerous recommendations which include changes to the current basins, design of future basins as well as suggestions regarding current basin operation and maintenance. No opinion by the author was given concerning alum cessation or reduction, although various options were provided. The use of fewer chemicals would be appreciated both monetarily and publicly; however this would necessitate increased attention to the RI system by City staff and would leave the basins more susceptible to operational failure, which could result in failure to comply with discharge permits. The recommendations are offered by the author, but the decisions are suitably left to the City of Kamloops.
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) | 0,000 | 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 | 0,000 | 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 ».