Performance study on algal alginate as natural coagulant for the removal of Congo red dye

Abstract

Coagulation is an important step in the physicochemical treatment of wastewater. Due to the disadvantage associated with the commonly used inorganic metal salts and other synthetic polymers, in recent years, research on the use of natural organic polymers as coagulant is gaining importance. In this study, the coagulation potential of alginate extracted from brown algae, Sargassum sp. for the removal of Congo red dye from aqueous solution has been identified. The yield of alginate extraction was found to be 40.8%. The extracted alginate was characterized by Fourier transform infrared spectroscopy and Scanning electron microscopy techniques. The effect of initial pH (4-6), alginate dose (10-60 mg/L), calcium dose (1-6 g/L), and initial dye concentration (50-250 mg/L) on dye removal have been investigated. It is inferred from the study that the maximum removal of dye (96%) was achieved with increasing alginate and calcium dose for increasing dye concentration, at pH 4. The obtained results were compared with the literature on Congo red dye removal using various adsorbents and coagulants.

Efficient adsorptive removal of Congo red from aqueous solution by synthesized zeolitic imidazolate framework-8

“…The separation factor of R L was calculated using equation (6) (Figure S2). All R L values were in the range of 0-1, which pointed to the favorable adsorption of CR over ZIF-8.…”

“…Some physical-chemical techniques have been investigated for CR removal from aquatic systems, for example, sonophotocatalytisis, photolysis, coagulation/ flocculation and adsorption. [4][5][6][7] In all previous studied techniques, adsorption is regarded as a competitive one due to its simplicity, low cost and effectiveness and until now, various adsorbent materials have been examined for CR removal, including activated carbon, clay materials, modified biosorbents and synthetic materials. [8][9][10][11][12] Metal-organic frameworks (MOFs) represent a class of porous crystalline frameworks, and consist of metal ions (or clusters) and organic ligands.…”

Utilization of Papaya Seeds as Natural Coagulant for Synthetic Textile Coloring Agent Wastewater Treatment

“…Generally, natural coagulants could be classified as plant-based and non-plant based coagulant. Non-plant based coagulant usually comes from marine resources, such as chitosan [13] and alginate [14]. Various plant-based natural coagulants, such as Moringa oleifera [15], Moringa stenopelata [16], Plantago ovata [17], potato starch [18], okra (A. esculentus) [19] have been studied to treat textile wastewater.…”

Physico‐Chemical Processes

“…The application of natural coagulants could reduce the drawbacks of chemical coagulants, such as metallic toxicity and the production of large sludge volumes (Usman et al, 2016). According to Vijayaraghavan et al (2016), alginate extracted from brown algae, Sargassum sp. could be used in coagulation treatment of Congo red dye.…”