Bibliographic Details
| Title: |
Influencia del Tipo de Alcalinizante Sobre el Proceso de Estabilización Química del Agua Tratada en Plantas de Tratamiento Convencional. |
| Alternate Title: |
Influence of the Type of Alkali on the Chemical Stabilization Process of Treated Water in Conventional Treatment Plants. |
| Authors: |
PÉREZ, ANDREA1 andrea.perez@correounivalle.edu.co, MARIO GUTIÉRREZ, HÉCTOR1, GERMÁN DELGADO, LUIS1, JAVIER VIDAL, ALEX1, MARÍA RAMÍREZ, LINA1, FELIPE PORRAS, CHRISTIAN1, CARLOS ESCOBAR, JUAN2, OSPINA, JULIANA2, PABLO GUTIERREZ, JUAN2, TORRES, PATRICIA1 |
| Source: |
Revista EIA. ene-jun2025, Vol. 22 Issue 43, p1-32. 32p. |
| Subjects: |
Contamination of drinking water, Water distribution, Water disinfection, Water quality, Drinking water, Disinfection & disinfectants |
| Abstract (English): |
The low levels of alkalinity in surface supply sources, combined with the use of coagulants and disinfectants in the conventional treatment of drinking water, which consume alkalinity and reduce the pH, force adjustments in the quality of the water treated with in order to guarantee its chemical stabilization and prevent secondary contamination in the drinking water distribution system (DWDS) due corrosion or scale problems. In this study, the characteristics of different alkalis were reviewed in the literature, and the subsequently the chemical stabilization process was evaluated in jar test trials using water after disinfection, from a conventional drinking water treatment plant - WTP. Two disinfected-water quality conditions were evaluated, with initial pH of 560 and 3.98 units respectively (associated with raw water with turbidity of 30 and 200 NTU, respectively). Five alternatives were evaluated: three with simple alkalinization (Ca(OH)2, NaOH, Na2CO3) and two with double alkalinization (Ca(OH)2 +NaOH and Ca(OH)2 +Na2CO3 ). In double alkalinization, Ca(OH)2 was dosed until a pH close to 6.5-7.0 was reached, and then NaOH or Na2CO3 was subsequently added. In all cases, pH values between 7.04-8.96 3 were evaluated, and finally the aggressiveness indices (AI) and Langelier saturation indices (LSI) were determined. Different alkalizing alternatives were identified, each with advantages and limitations and whose selection will depend, in addition to its chemical characteristics and water quality, on aspects such as costs, ease of acquisition, preparation and dosage, type of DWDS materials, among others. The experimental evaluation showed that both Ca(OH)2 and the double alkalinization Ca(OH)2 +Na2CO3 are viable for the chemical stabilization, achieving an increase in the alkalinity and buffering capacity of the water, which makes the pH be more stable in the DWDS. It is highlighted that the effectiveness of Ca(OH)2 will depend on the CaO content (>90%) and adequate homogenization of the solution during dosing. The pH adjustment should be between 8.7 to 8.9, to reduce the corrosive tendency of the water and allowing values close to 12 and 0 of the IA and ISL indices respectively. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): |
Los bajos niveles de alcalinidad en las fuentes de abastecimiento superficial, aunado al uso de coagulantes y desinfectantes en el tratamiento convencional del agua para consumo humano, que en general consumen alcalinidad y reducen el pH, hacen necesario realizar ajustes en la calidad del agua tratada con el fin de garantizar su estabilización química y prevenir contaminación secundaria en el sistema de distribución de agua potable (SDA) por problemas de corrosión o incrustaciones. En este estudio se revisó la literatura sobre características de diferentes alcalinizantes y posteriormente se evaluó mediante ensayos de pruebas de jarras la estabilización química del agua, previamente desinfectada, de una planta de tratamiento de agua potable - PTAP convencional abastecida con agua cruda del río Cauca; se evaluaron dos condiciones de calidad de agua, previamente tratada y desinfectada, con pH inicial de 5,60 y 3,98 unidades respectivamente (asociadas a agua cruda con turbiedad de 30 y 200 UNT, respectivamente). Se evaluaron cinco alternativas: tres de alcalinización simple (Ca(OH)2, NaOH, Na2CO3) y dos de doble alcalinización (Ca(OH)2+NaOH y Ca(OH)2+Na1CO3). En la doble alcalinización se dosificó Ca(OH)2 hasta alcanzar un pH cercano a 6,5-7,0 y posteriormente se adicionó NaOH o Na2CO3. En todos los casos se evaluaron valores de pH entre 7,04-8,96, y finalmente se determinaron los índices de agresividad (IA) y de saturación de Langelier (ISL). Se identificaron diferentes alternativas de alcalinizantes, cada una con ventajas y limitaciones y cuya selección dependerá, además de sus características químicas y la calidad del agua, de aspectos como costos, facilidad de adquisición, preparación y dosificación, tipo de materiales del SDA, entre otros. La evaluación experimental mostró que, tanto Ca(OH), como la doble alcalinización Ca(OH)2+Na2CO3, resultan viables para la estabilización química del agua analizada, lográndose aumentar la alcalinidad y la capacidad amortiguadora del agua, que favorece que el pH sea más estable en el SDA. Se destaca que la eficacia del Ca(OH), dependerá del contenido de CaO (>90%) y de una adecuada homogenización de la solución durante su dosificación. El ajuste del pH debe ser del orden de 8,7 a 8,9 para reducir la tendencia corrosiva del agua y permitiendo alcanzar valores cercanos a 12 y 0 de los índices IA e ISL respectivamente. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
