Disminución de la demanda química de oxígeno y color, en el efluente de recurtido y teñido mediante coagulación - floculación y adsorción
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Date
2024
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Universidad Nacional de Trujillo
Abstract
El presente estudio trata sobre la disminución de la demanda química de oxígeno y color en el efluente de recurtido y teñido mediante coagulación- floculación y adsorción, se evaluó la concentración de coagulante y pH inicial en los procesos combinados de coagulación – floculación, se usó adsorbentes como coagulante, sulfato de aluminio, floculante, Magnefloc y carbón activado en polvo, para reducir la demanda química de oxígeno (DQO) y disminuir el contenido de colorante. Se realizaron 27 ensayos durante el periodo, de coagulación y floculación midiendo en cada ensayo la disminución del contenido de DQO, la velocidad de agitación fue de 400 rpm, durante 30 minutos para la coagulación y 300 rpm durante una hora para la floculación. Luego se realizó el análisis de DQO por el método colorimétrico a reflujo cerrado. El mejor resultado obtenido de disminución de DQO fue de 79.94 %. En el proceso de adsorción se le adicionó HCl a 5 % p/v al adsorbente y su velocidad de agitación fue de 200 rpm por una hora a 25°C, luego se realizó el análisis de color por el método de calidad del agua. El mejor resultado de porcentajes de remoción de colorante fue de 93.58 % respectivamente.
The present study deals with the decrease in the chemical demand for oxygen and color in the retanning and dyeing effluent through coagulation-flocculation and adsorption. The coagulant concentration and initial pH were evaluated in the combined coagulation-flocculation processes. Adsorbents were used. as a coagulant, aluminum sulfate, flocculant, Magnefloc and activated carbon powder, to reduce the chemical oxygen demand (COD) and reduce the dye content. 27 coagulation and flocculation tests were carried out during the period, measuring the decrease in COD content in each test. The stirring speed was 400 rpm, for 30 minutes for coagulation and 300 rpm for one hour for flocculation. Then the COD analysis was carried out by the colorimetric method at closed reflux. The best result obtained for COD reduction was 79.94%. In the adsorption process, HCl was added at 5% w/v to the adsorbent and its stirring speed was 200 rpm for one hour at 25°C, then the color analysis was carried out by the water quality method. The best result of dye removal percentages was 93.58% respectively.
The present study deals with the decrease in the chemical demand for oxygen and color in the retanning and dyeing effluent through coagulation-flocculation and adsorption. The coagulant concentration and initial pH were evaluated in the combined coagulation-flocculation processes. Adsorbents were used. as a coagulant, aluminum sulfate, flocculant, Magnefloc and activated carbon powder, to reduce the chemical oxygen demand (COD) and reduce the dye content. 27 coagulation and flocculation tests were carried out during the period, measuring the decrease in COD content in each test. The stirring speed was 400 rpm, for 30 minutes for coagulation and 300 rpm for one hour for flocculation. Then the COD analysis was carried out by the colorimetric method at closed reflux. The best result obtained for COD reduction was 79.94%. In the adsorption process, HCl was added at 5% w/v to the adsorbent and its stirring speed was 200 rpm for one hour at 25°C, then the color analysis was carried out by the water quality method. The best result of dye removal percentages was 93.58% respectively.
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Keywords
Coagulación-floculación, DQO, Agua de recurtido y teñido, Color, Carbón activado