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Published in: Arabian Journal for Science and Engineering 7/2021

16-10-2020 | Research Article-Chemical Engineering

Optimization Study of Leucaena leucocephala Seed Extract as Natural Coagulant on Decolorization of Aqueous Congo Red Solutions

Authors: Jovan Kristanda, Kenneth Sandrosa Sintiago, Hans Kristianto, Susiana Prasetyo, Asaf K. Sugih

Published in: Arabian Journal for Science and Engineering | Issue 7/2021

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Abstract

Coagulation is a water and wastewater treatment technology that has been widely used due to its high efficiency and effectiveness. Various inorganic salts are commonly used as coagulant; however, there are some negative impacts of utilization of these chemical coagulants, such as high costs, large sludge volume, and also potential negative impact to human health. To overcome these problems, natural-based coagulants have been explored to reduce and substitute chemical coagulants. In this study we investigated utilization of Leucaena leucocephala seed protein, extracted using 0.5 M MgCl2 solution as natural coagulant to treat synthetic Congo red wastewater. From the protein solubility profile at various pH, it could be observed that leucaena protein’s isoelectric point was around pH 4. The optimization of coagulation condition was done by using Response Surface Method (RSM)—Central Composite Design (CCD) with variations of pH (2.93–4.12), coagulant dose (183.52–496.58 mg eq BSA/L), and dye concentration (44.1–56 mg/L). This experimental design was used to obtain the optimum condition that gave maximum dye removal percentage and minimum sludge volume. It was found that pH, coagulant dose, and dye concentration were significant for dye removal and sludge volume. Furthermore, it became evident that charge neutralization was the coagulation mechanism in this study. Based on the obtained model, 88.61% dye removal with 16.93 mL/L sludge volume was obtained at the optimum condition. The predicted optimum condition was in a good agreement with experimental data with relatively low error value. The obtained result implies good potency of leucaena as natural coagulant.

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Metadata
Title
Optimization Study of Leucaena leucocephala Seed Extract as Natural Coagulant on Decolorization of Aqueous Congo Red Solutions
Authors
Jovan Kristanda
Kenneth Sandrosa Sintiago
Hans Kristianto
Susiana Prasetyo
Asaf K. Sugih
Publication date
16-10-2020
Publisher
Springer Berlin Heidelberg
Published in
Arabian Journal for Science and Engineering / Issue 7/2021
Print ISSN: 2193-567X
Electronic ISSN: 2191-4281
DOI
https://doi.org/10.1007/s13369-020-05008-1

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