Development of a Large Batch Bench-Scale Dissolved Air Flotation System for Drinking Water Treatability Tests = Desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable

The dissolved air flotation (DAF) has been used in drinking water treatment for its excellent algae and natural organic matter (NOM) removal. DAF drinking water treatability test are often conducted in a DAF jar test apparatus. Although, DAF jar test studies showed that they were able to predict NOM...

Descripción completa

Detalles Bibliográficos
Autor Principal: Gonzalez Galvis, Juan Pablo
Formato: Trabajo de grado (Bachelor Thesis)
Lenguaje:Desconocido (Unknown)
Publicado: 2019
Materias:
Acceso en línea:http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/1247
id ir-p17054coll23-1247
recordtype dspace
spelling ir-p17054coll23-12472020-09-29 Development of a Large Batch Bench-Scale Dissolved Air Flotation System for Drinking Water Treatability Tests = Desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable Gonzalez Galvis, Juan Pablo The dissolved air flotation (DAF) has been used in drinking water treatment for its excellent algae and natural organic matter (NOM) removal. DAF drinking water treatability test are often conducted in a DAF jar test apparatus. Although, DAF jar test studies showed that they were able to predict NOM removals at full-scale facilities well, they have not always been successful in predicting the turbidity removals. One possible reason of the DAF jar test inaccuracy results could be associated to the small jar diameter, which may create wall effects. Therefore, the first two objectives of this research are: a) to develop and test a new, larger diameter and larger volume batch bench-scale dissolved air flotation system (LB-DAF) to better simulate turbidity removals in drinking water applications; b) to confirm these results by comparing the LB-DAF and full-scale DAF turbidity removals for two other source waters. The raw water characteristics of the three plants were quite different and the testing was performed at different times of the year. The development/optimization of the LB-DAF evaluated the impact of different variables (i.e., mixing intensity, water depth/tank diameter ratio, impeller shape, saturator pressure and recycle ratio). The results showed that the LB-DAF predicted well the full-scale DAF turbidity removals at three water treatment plants, and these predictions were better than those of DAF jar tests. For the LB-DAF design and operational variables evaluated had a limited impact on the turbidity removals. The LB-DAF predicted well DAF full-scale turbidity removals regardless of water temperature. This is an indication of the robustness of the DAF system. Ballasted sedimentation (BS) is a compact coagulation/flocculation and sedimentation process combination that has become very popular because it is very compact and because it can handle large variations in raw water turbidity and NOM. The literature survey did not initially identify studies on the BS treatment of algal impacted waters, for which DAF is considered particularly suitable. Thus, the third main objective of this dissertation was to compare the efficiency of BS with that conventional gravity settling (CGS), and that of DAF for the treatment of an algal impacted water via jar tests. These comparisons were performed at the Belleville Water Treatment Plant using Bay of Quinte water, one of the most eutrophic zones of Lake Ontario. Unfortunately, a change of weather prior to the testing resulted in raw water samples with relatively low concentrations of algae and cyanobacteria. The testing showed that DAF and BS had very similar NOM, cyanobacteria/algae (chlorophyll a and phycocyanin) removals.; however, the BS required microsand addition, polymer addition and a slightly higher alum dose. Only for turbidity removal the DAF was somewhat superior. It is suggested that these comparison experiments be repeated with waters that are more impacted by algae and cyanobacteria. Flotación por aire disuelto; Coagulación; Turbiedad; Materia orgánica natural; Dissolved air flotation; Coagulation; Turbidity; Natural organic matter Tecnología; Tecnología / Ingeniería y operaciones afines; Tecnología / Ingeniería y operaciones afines / Otras ramas de la ingeniería 2019 PDF Tesis ENG - Inglés Colombia Colfuturo © Derechos reservados del autor http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/1247
institution Biblioteca Virtual Banco de la República - Colecciones digitales
collection Custom
language Desconocido (Unknown)
topic Flotación por aire disuelto; Coagulación; Turbiedad; Materia orgánica natural; Dissolved air flotation; Coagulation; Turbidity; Natural organic matter
Tecnología; Tecnología / Ingeniería y operaciones afines; Tecnología / Ingeniería y operaciones afines / Otras ramas de la ingeniería
spellingShingle Flotación por aire disuelto; Coagulación; Turbiedad; Materia orgánica natural; Dissolved air flotation; Coagulation; Turbidity; Natural organic matter
Tecnología; Tecnología / Ingeniería y operaciones afines; Tecnología / Ingeniería y operaciones afines / Otras ramas de la ingeniería
Gonzalez Galvis, Juan Pablo
Development of a Large Batch Bench-Scale Dissolved Air Flotation System for Drinking Water Treatability Tests = Desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable
description The dissolved air flotation (DAF) has been used in drinking water treatment for its excellent algae and natural organic matter (NOM) removal. DAF drinking water treatability test are often conducted in a DAF jar test apparatus. Although, DAF jar test studies showed that they were able to predict NOM removals at full-scale facilities well, they have not always been successful in predicting the turbidity removals. One possible reason of the DAF jar test inaccuracy results could be associated to the small jar diameter, which may create wall effects. Therefore, the first two objectives of this research are: a) to develop and test a new, larger diameter and larger volume batch bench-scale dissolved air flotation system (LB-DAF) to better simulate turbidity removals in drinking water applications; b) to confirm these results by comparing the LB-DAF and full-scale DAF turbidity removals for two other source waters. The raw water characteristics of the three plants were quite different and the testing was performed at different times of the year. The development/optimization of the LB-DAF evaluated the impact of different variables (i.e., mixing intensity, water depth/tank diameter ratio, impeller shape, saturator pressure and recycle ratio). The results showed that the LB-DAF predicted well the full-scale DAF turbidity removals at three water treatment plants, and these predictions were better than those of DAF jar tests. For the LB-DAF design and operational variables evaluated had a limited impact on the turbidity removals. The LB-DAF predicted well DAF full-scale turbidity removals regardless of water temperature. This is an indication of the robustness of the DAF system. Ballasted sedimentation (BS) is a compact coagulation/flocculation and sedimentation process combination that has become very popular because it is very compact and because it can handle large variations in raw water turbidity and NOM. The literature survey did not initially identify studies on the BS treatment of algal impacted waters, for which DAF is considered particularly suitable. Thus, the third main objective of this dissertation was to compare the efficiency of BS with that conventional gravity settling (CGS), and that of DAF for the treatment of an algal impacted water via jar tests. These comparisons were performed at the Belleville Water Treatment Plant using Bay of Quinte water, one of the most eutrophic zones of Lake Ontario. Unfortunately, a change of weather prior to the testing resulted in raw water samples with relatively low concentrations of algae and cyanobacteria. The testing showed that DAF and BS had very similar NOM, cyanobacteria/algae (chlorophyll a and phycocyanin) removals.; however, the BS required microsand addition, polymer addition and a slightly higher alum dose. Only for turbidity removal the DAF was somewhat superior. It is suggested that these comparison experiments be repeated with waters that are more impacted by algae and cyanobacteria.
format Trabajo de grado (Bachelor Thesis)
author Gonzalez Galvis, Juan Pablo
author_facet Gonzalez Galvis, Juan Pablo
author_sort Gonzalez Galvis, Juan Pablo
title Development of a Large Batch Bench-Scale Dissolved Air Flotation System for Drinking Water Treatability Tests = Desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable
title_short Development of a Large Batch Bench-Scale Dissolved Air Flotation System for Drinking Water Treatability Tests = Desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable
title_full Development of a Large Batch Bench-Scale Dissolved Air Flotation System for Drinking Water Treatability Tests = Desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable
title_fullStr Development of a Large Batch Bench-Scale Dissolved Air Flotation System for Drinking Water Treatability Tests = Desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable
title_full_unstemmed Development of a Large Batch Bench-Scale Dissolved Air Flotation System for Drinking Water Treatability Tests = Desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable
title_sort development of a large batch bench-scale dissolved air flotation system for drinking water treatability tests = desarrollo de un sistema de banco de flotación por aire disuelto a gran escala para test de tratabilidad de agua potable
publishDate 2019
url http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/1247
_version_ 1682460175383920640
score 11,828437