Study of the effects of process parameters on electroforced sedimentation in solid–liquid separation using response surface methodology

Alam, Md. Monjurul and Alam, Md Zahangir and Jami, Mohammed Saedi and Amosa, Mutiu K. and Iwata, Masashi (2016) Study of the effects of process parameters on electroforced sedimentation in solid–liquid separation using response surface methodology. Waste and Biomass Valorization, 7 (3). pp. 583-591. ISSN 1877-2641 E-ISSN 1877-265X

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Abstract

Electroforced sedimentation (EFS) is a wellknown technique for enhancing the solid content of the final sludge cake. However, the parameters affecting the performance of EFS and quality of the resulting sludge cake, as well as the removed water, are not sufficiently studied. In this research, a mixture of zinc oxide (representing sludge) and polyacrylamide (dewatering aid) were used as experimental materials. The process parameters of electroforced sedimentation were optimized using a design of experiment software (Design Expert Version 7.0.0) with a face-centered central composite design (FCCCD) under response surface methodology. An optimization study was carried out for the output response (sedimentation velocity) based on three process factors and an empirical model was developed. The optimized values for current density, total solid volume per unit cross-sectional area and polyacrylamide dose for the highest sedimentation velocity (0.0199 cm/min) were 6.0 A/m2 , 7.74 mm and 1.53 % (based on the weight of zinc oxide), respectively. The overall model was significant with Prob [F value of 0.0117 and R2 value of 0.8911 while the most significant parameter was observed to be the current density with a Prob [F value of 0.0004. Validation experiments were conducted to confirm and measure the accuracy of the models for the three set of parameters including optimum parameters. The error was within the limit of prediction accuracy, and the sedimentation velocity was enhanced by the addition of 1.53 % PAM as dewatering aid. Thus, it was concluded that EFS can be applied successfully for materials having permanent charge.

Item Type:	Article (Journal)
Additional Information:	4157/47254
Uncontrolled Keywords:	Electroforced sedimentation, Biosolids, Sludge, Zinc oxide, Current density
Subjects:	T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User:	Prof. Ir. Dr. Mohammed Saedi Jami, PhD CEng MIChemE
Date Deposited:	07 Jan 2016 11:31
Last Modified:	10 Aug 2017 09:00
URI:	http://irep.iium.edu.my/id/eprint/47254

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