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Coagulation: Determination of Key Operating Parameters by Multi-Response Surface Methodology Using Desirability Functions

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Department of Mechanical Engineering, University of La Rioja, Logroño 26004, La Rioja, Spain
2
IK4-LORTEK, 20240 Ordizia, Guipuzcoa, Spain
3
Department of Mining Exploitation and Prospecting, University of Oviedo, 33004 Principality of Asturias, Spain
*
Author to whom correspondence should be addressed.
Water 2019, 11(2), 398; https://doi.org/10.3390/w11020398
Received: 31 October 2018 / Revised: 13 February 2019 / Accepted: 21 February 2019 / Published: 25 February 2019
(This article belongs to the Section Wastewater Treatment and Reuse)
The clarification process removes colloidal particles that are suspended in waste water. The efficiency of this process is influenced by a series of inputs or parameters of the coagulation process, of which the most commonly used are initial turbidity, natural coagulant dosage, temperature, mixing speed and mixing time. The estimation of the natural coagulant dosage that is required to effectively remove these total suspended solids is usually determined by a jar test. This test seeks to achieve the highest efficiency of removal of the total suspended solids while reducing the final turbidity of waste water. This is often configured in iterative fashion, and requires significant experimentation and coagulant. This paper seeks to identify regression models that relate the clarification process parameters to the process outputs (final turbidity and total suspend solid) by the Response Surface Methodology (RSM) based on experiments of Central Composite Design (CCD) of experiments that involve three emerging natural coagulants. Several clarification process scenarios also were proposed and demonstrated using the Multi-Response Surface (MRS) with desirability functions. The experimental results were found to be in close agreement to what are provided by the regression models. This validates the use of the MRS-based methodology to achieve satisfactory predictions after minimal experimentation. View Full-Text
Keywords: clarification process; coagulation; waste water treatment; Multi-Response Surface methodology clarification process; coagulation; waste water treatment; Multi-Response Surface methodology
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MDPI and ACS Style

Corral Bobadilla, M.; Lorza, R.L.; Escribano García, R.; Somovilla Gómez, F.; Vergara González, E.P. Coagulation: Determination of Key Operating Parameters by Multi-Response Surface Methodology Using Desirability Functions. Water 2019, 11, 398.

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