Subproductos de desinfección derivados de la materia orgánica algar disuelta de tres diferentes grupos de microalgas: alga verde, cianobacteria y diatomea
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Los subproductos de desinfección (SPD) son una consecuencia no intencional del proceso de tratamiento del agua para consumo humano. Estos se generan a partir de la reacción entre la materia orgánica y el desinfectante. Dentro de la materia orgánica que puede reaccionar con el desinfectante se encuentra la materia orgánica algar (MOA). Este tipo de materia cobra gran importancia por su ubicuidad, por su difícil remoción durante el tratamiento del agua y porque los SPD que genera pueden traer graves afectaciones en la salud humana. Por lo tanto, en este estudio se caracterizó la MOA de tres diferentes tipos de algas colombianas (alga verde Chlorella sp. CIIA 0115, cianobacteria Pseudanabaena sp. CIIA 0215 y diatomea Nitzschia sp. CIIA 0315) e identificó los SPD que se generan a partir de su cloración. Los resultados de la caracterización demostraron que todos los tipos de materia orgánica evaluados son hidrófilos con bajo SUVA. El DOC para estas algas está entre 8.48 mg/L y 78.51mg/L, la concentración de proteínas entre 12.8mg/L y 31.5mg/L y la concentración de carbohidratos se encuentra entre 10.811mg/L y 28.802mg/L. Adicionalmente, el análisis de los resultados de las matrices de emisión excitación de fluorescencia (EEM) arrojó que la MOA de las algas estudiadas es rica en proteínas, material protéico y aminoácidos. En cuanto a los SPD, se identificaron tres grupos: trihalomentanos (THM), ácidos haloacéticos (HAA) y subproductos de desinfección emergentes (SPDe). Lo que se encontró fue que los dos grupos predominantes de SPD son los HAA y THM con una presencia dentro del cóctel de SPD identificados del 47.5% al 91.5% y del 0.0% al 47.4%, respectivamente. Se prevee que la importancia relativa de estos SPD obedece al tipo de materia orgánica trabajada, rica en compuestos nitrogenados.
Disinfection byproducts (DBP) are unintended consequence of the treatment process of water for human consumption. They are generated from the reaction between organic matter and disinfectant. One type of organic matter that could react with disinfectant is algal organic matter (AOM). This type of organic matter is of great importance because of its ubiquity, and its difficulty to remove through traditional water treatment process. Additionally, AOM is precursor of DBP that may bring serious effects on human health. Therefore, in this study the AOM of three different types of colombian algae (green algae Chlorella sp. CIIA 0115, cyanobacteria Pseudanabaena sp. CIIA 0215 and diatom Nitzschia sp. CIIA 0315) were characterized and the DBPs resulting from chlorination of the AOM were identified. The characterization results showed that all types of algal organic matter evaluated are hydrophilic with low SUVA. The DOC for these algae is between 8.48 mg / L and 78.51mg / L, protein concentration between 12.8mg / L and 31.5mg / L and the concentration of carbohydrate is between 10.811mg / L and 28.802mg / L. Furthermore, the analysis of the results of excitation emission matrix (EEM) showed that the AOM studied has predominance of proteins, amino acids and proteinaceous material. With regard to DBP, three groups were identified: trihalomethane (THM), haloacetic acid (HAA) and emerging disinfection byproducts (SPDe). It was found that the two predominant groups of DBP are HAA and THM with relative presence of 47.5% to 91.5% and 0.0% to 47.4%, respectively. It is anticipated that the relative importance of these DBP depends on the type of organic matter used, rich in nitrogen compounds.
Disinfection byproducts (DBP) are unintended consequence of the treatment process of water for human consumption. They are generated from the reaction between organic matter and disinfectant. One type of organic matter that could react with disinfectant is algal organic matter (AOM). This type of organic matter is of great importance because of its ubiquity, and its difficulty to remove through traditional water treatment process. Additionally, AOM is precursor of DBP that may bring serious effects on human health. Therefore, in this study the AOM of three different types of colombian algae (green algae Chlorella sp. CIIA 0115, cyanobacteria Pseudanabaena sp. CIIA 0215 and diatom Nitzschia sp. CIIA 0315) were characterized and the DBPs resulting from chlorination of the AOM were identified. The characterization results showed that all types of algal organic matter evaluated are hydrophilic with low SUVA. The DOC for these algae is between 8.48 mg / L and 78.51mg / L, protein concentration between 12.8mg / L and 31.5mg / L and the concentration of carbohydrate is between 10.811mg / L and 28.802mg / L. Furthermore, the analysis of the results of excitation emission matrix (EEM) showed that the AOM studied has predominance of proteins, amino acids and proteinaceous material. With regard to DBP, three groups were identified: trihalomethane (THM), haloacetic acid (HAA) and emerging disinfection byproducts (SPDe). It was found that the two predominant groups of DBP are HAA and THM with relative presence of 47.5% to 91.5% and 0.0% to 47.4%, respectively. It is anticipated that the relative importance of these DBP depends on the type of organic matter used, rich in nitrogen compounds.