Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression

Expression is the separation of liquid from a solid/liquid system by compression due to the movement of the retaining walls of the filter chamber. In the expression of slurry material, the application of mechanical pressure to the retaining walls causes a sudden increase of hydraulic pressure unifor...

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Main Authors:	Iwata, Masashi, Shimoizu, Kazuya, Iwasaki, Tomohiro, Jami, Mohammed Saedi
Format:	Conference or Workshop Item
Language:	English
Published:	2019
Subjects:	TP155 Chemical engineering
Online Access:	http://irep.iium.edu.my/79042/ http://irep.iium.edu.my/79042/8/79042%20abstract.pdf

id	iium-79042
recordtype	eprints
spelling	iium-790422020-02-25T07:03:48Z http://irep.iium.edu.my/79042/ Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression Iwata, Masashi Shimoizu, Kazuya Iwasaki, Tomohiro Jami, Mohammed Saedi TP155 Chemical engineering Expression is the separation of liquid from a solid/liquid system by compression due to the movement of the retaining walls of the filter chamber. In the expression of slurry material, the application of mechanical pressure to the retaining walls causes a sudden increase of hydraulic pressure uniformly throughout the slurry. Initially, the process of expression proceeds based on the principle of filtration, where the thickness of filter cake increases over time. Filtration terminates when the whole slurry forms a layer of filter cake, and the consolidation of the cake follows. Exact identification of the time when the chamber is filled with the cake is essential for an effective expression operation. The electrokinetic response of expressed material provides us with some information on the status of the filter chamber. In this work, we have measured the time course of electric potential difference (EPD) between the retaining walls to elucidate the electrokinetic aspects of mechanical dewatering. The experimental apparatus used in this study consists essentially of a piston press with a cylinder and a piston. Filter media are placed at the cylinder bottom and the very end of the piston. EPD between the filter media was monitored during the experiment. As can be seen from the figure, the absolute value of EPD increases with the progress of the filtration period, followed by the decrease during the consolidation period. It was observed that the time when the absolute value of EPD began to decline coincides with the time when the filtration period ended. We have derived a theoretical equation of streaming potential for a flow path of the expressed material and combined it with filtration and consolidation theories to calculate the theoretical time course of EPD of expressed material. It has been found that EPD reflects liquid pressure variation throughout the solid/liquid mixture. 2019 Conference or Workshop Item NonPeerReviewed application/pdf en http://irep.iium.edu.my/79042/8/79042%20abstract.pdf Iwata, Masashi and Shimoizu, Kazuya and Iwasaki, Tomohiro and Jami, Mohammed Saedi (2019) Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression. In: 18th Asian Pacific Confederation of Chemical Engineering Congress (APCChE 2019), 23rd – 27th September 2019, Sapporo, Japan. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TP155 Chemical engineering
spellingShingle	TP155 Chemical engineering Iwata, Masashi Shimoizu, Kazuya Iwasaki, Tomohiro Jami, Mohammed Saedi Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression
description	Expression is the separation of liquid from a solid/liquid system by compression due to the movement of the retaining walls of the filter chamber. In the expression of slurry material, the application of mechanical pressure to the retaining walls causes a sudden increase of hydraulic pressure uniformly throughout the slurry. Initially, the process of expression proceeds based on the principle of filtration, where the thickness of filter cake increases over time. Filtration terminates when the whole slurry forms a layer of filter cake, and the consolidation of the cake follows. Exact identification of the time when the chamber is filled with the cake is essential for an effective expression operation. The electrokinetic response of expressed material provides us with some information on the status of the filter chamber. In this work, we have measured the time course of electric potential difference (EPD) between the retaining walls to elucidate the electrokinetic aspects of mechanical dewatering. The experimental apparatus used in this study consists essentially of a piston press with a cylinder and a piston. Filter media are placed at the cylinder bottom and the very end of the piston. EPD between the filter media was monitored during the experiment. As can be seen from the figure, the absolute value of EPD increases with the progress of the filtration period, followed by the decrease during the consolidation period. It was observed that the time when the absolute value of EPD began to decline coincides with the time when the filtration period ended. We have derived a theoretical equation of streaming potential for a flow path of the expressed material and combined it with filtration and consolidation theories to calculate the theoretical time course of EPD of expressed material. It has been found that EPD reflects liquid pressure variation throughout the solid/liquid mixture.
format	Conference or Workshop Item
author	Iwata, Masashi Shimoizu, Kazuya Iwasaki, Tomohiro Jami, Mohammed Saedi
author_facet	Iwata, Masashi Shimoizu, Kazuya Iwasaki, Tomohiro Jami, Mohammed Saedi
author_sort	Iwata, Masashi
title	Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression
title_short	Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression
title_full	Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression
title_fullStr	Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression
title_full_unstemmed	Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression
title_sort	potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression
publishDate	2019
url	http://irep.iium.edu.my/79042/ http://irep.iium.edu.my/79042/8/79042%20abstract.pdf
first_indexed	2023-09-18T21:51:12Z
last_indexed	2023-09-18T21:51:12Z
_version_	1777413781013397504

Potential of electrokinetic response for the analysis of solid-liquid mixture during mechanical expression

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