Predictive modelling of a rapid stratified bed filter for turbidity removal from surface water

• Autorzy: Tejada-Tovar Candelaria N. , Villabona-Ortíz Ángel , López-Barbosa David

Identyfikatory

DOI

10.24425/jwld.2022.140797

• Języki publikacji: EN

Abstrakty

EN

The objective of the present work was to evaluate the hydrodynamic behaviour of a stratified bed filtration column consisting of 4 cm of sand and 2 cm of limestone to remove turbidity and measuring the head loss through the filter in several runs. In this study, two types of sand were used as filtering bed material, one fine and one medium. Crushed limestone was also available. These materials were characterized to determine the average particle diameter, porosity, and permeability coefficient. These were respectively 1.7∙10^-4 m, 336.96 and 0.68 m∙day^-1 for fine sand, 3.3∙10^-1 m, 654.24 and 2.59 m∙day^-1 for the medium sand and 1.26∙10^-3 m, 388.8 and 8.64 m∙day^-1 for crushed limestone. Using these materials, hydrodynamic analyses were carried out using clean water under rapid filtration conditions. In these analyses, different filtration rates were determined to be used in each experiment. Once the filtration rates were determined, the filtration analysis was performed with synthetic turbid water prepared at 8 NTU using tap water and bentonite. From the results obtained, a predictive model was developed based on total head losses for the evaluated filter, maintaining the rapid filtration condition. As a result, a turbidity removal efficiency of 97.7% was obtained with a total head loss of 17.8 cm at a filtration rate of 153 m·day^-1 . The developed model predicted head loss as a function of operating time, filtration rate, and filter depth to maximise turbidity removal. The model showed excellent prediction accuracy with R² of 0.9999, which indicates that the model predictions are not biased. It was concluded that, due to the porosity of these materials, a stratified bed of sedimentary rocks has a great potential to be used in surface water filtration processes, which implies that it could be used at the rural community level as a form of water treatment, since the material is a readily available, maintenance is simple and low cost, and installation and operation are effortless.

Słowa kluczowe

EN

limestone; predictive model; rapid filtration; sand; stratified bed

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2022
• Tom: no. 53
• Strony: 192--202
• Opis fizyczny: Bibliogr. 28 poz., rys., tab., wykr.

Twórcy

autor

Tejada-Tovar Candelaria N.

• Universidad de Cartagena, Faculty of Engineering, Chemical Engineering Department, Avenida del Consulado St. #30 No. 48 152, 130015, Cartagena, Colombia

• https://orcid.org/0000-0002-2323-1544

autor

Villabona-Ortíz Ángel

• Universidad de Cartagena, Faculty of Engineering, Chemical Engineering Department, Avenida del Consulado St. #30 No. 48 152, 130015, Cartagena, Colombia

• https://orcid.org/0000-0001-8488-1076

autor

López-Barbosa David

• Universidad de Cartagena, Faculty of Engineering, Chemical Engineering Department, Avenida del Consulado St. #30 No. 48 152, 130015, Cartagena, Colombia

• https://orcid.org/0000-0002-1356-5655

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).