electroosmotic dewatering

ELECTROOSMOT1C DEWATERING UNDER A. C. ELECTRIC FIELD …

ABSTRACT D.C. electric field has been usually used for electroosmotic dewatering. Under the condition of D.C., however, electrical contact resistance between the electrode and dewatering material is increased considerably with the process of dewalering. Such a circumstance hinders continuation of effective electroosmotic dewatering. To reduce the hindrance, application of A.C. electric field ...

Electroosmotic dewatering of chalk sludge, iron hydroxide ...

Electroosmotic dewatering has been tested in laboratory cells on four different porous materials: chalk sludge, iron hydroxide sludge, wet fly ash and biomass sludge from enzyme production. In all cases it was possible to remove water when passing electric DC current through the material.

Electroosmotic dewatering of cellulose nanocrystals

It is addressed in this study by utilising electroosmotic dewatering to increase the solid content of suspensions of cellulose nanocrystals. The solid content was increased from 2.3 up to 15.3 wt%, i.e. removal of more than 85% of all the water present in the system, at a much lower energy demand than that of thermal drying.

Electro-osmotic dewatering machine – Electric and osmotic ...

The dewatering mechanism of the X-ERAD machine foresees a mechanical action for moving sludge across the system and is able to overcome outlet counter-pressure. The electro-osmotic action occurs consecutively and simultaneously with the mechanical action. X-ERAD is designed to reach dried sludge values exceeding 20% with minimum energy expenditure.

Electro-Osmotic Dewatering under Electro-Osmotic Pulse ...

Abstract. Direct current (DC) electric fields have been used for electro-osmotic dewatering. Under DC conditions, however, the electrical contact resistance between the electrode and the dewatering material increases considerably during the process of dewatering. Such a circumstance hinders the continuation of effective electro-osmotic dewatering.

Efficient dewatering of waterworks sludge by ...

Electroosmotic dewatering of water treatment process sludge, in which a relatively high specific resistance causes difficulties in water removal, is described. The dewatering is accelerated and economically attractive by additives which increase the abs. value of the z potential but do not lead to stable suspensions.

1 Electro-osmosis - MIT

Induced-Charge Electro-osmosis and Electrophoresis 18.095: IAP Mathematics Lecture Series 2006 Notes and Homework Problems for Lecture 2 Martin Z. Bazant

"PED: pressurized electroosmotic dewatering " by Leon ...

Mechanical solid/liquid separation or dewatering of fine-grained suspensions is difficult to accomplish with any degree of success, cost effectiveness and/or practicality. The use of electroosmosis, the electrokinetic transport of water, which is theoretically independ- ent of pore size, on the other hand can be quite slow and consume a great deal of electrical energy.

Design and modelling of electroosmotic dewatering - CORE

The results showed that electroosmotic dewatering of sludge is both feasible and potentially economic. It is also shown that the use of the Helmholtz-Smolucowski flow eqPation, together with the assumptions of no electrochemical reaction and a constant electroosmotic permeability, to predict the dewatering process is not sound.

Efficient dewatering of waterworks sludge by …

Electroosmotic dewatering of water treatment process sludge, in which a relatively high specific resistance causes difficulties with regard to water removal, is described. The dewatering can be both accelerated and made economically more attractive by additives which increase the absolute value of the [ potential but do not lead to stable ...

Proposed laboratory investigation into electroosmotic ...

Sep 02, 2021· The purpose of this study is to explore undrained shear strength gain in surficial mine tailings using electroosmotic dewatering (EOD) to help promote closure and reclamation of TSFs. Electroosmotic dewatering uses electrodes to apply an electrical direct current to induce flow through a porous medium. An experiment ...

On the dewatering of electroosmotic soil using ...

On the dewatering of electroosmotic soil using intermittent current incorporated with calcium chloride Environ Technol . 2019 Jul 10;1-11. doi: 10.1080/09593330.2019.1634154.

Electroosmotic Dewatering - Electric Field Applications ...

Sep 14, 1995· Electroosmotic Dewatering. Masashi Iwata. Search for more papers by this author. Masashi Iwata. Search for more papers by this author. Book Editor(s): Professor Takao Tsuda. Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466 Japan ...

ELECTROOSMOTIC DEWATERING (EOD) OF CLAYS AND …

ABSTRACT In the electroosmotic dewatering (EOD) of clays, suspensions and fines, a continuous or interrupted DC voltage, V, is applied between the anode and the cathode. In the previous literature on this subject the components of V have not been completely clarified. Following a brief outline of the EOD that emphasizes the central role of the electrochemical double layer, we provide an ...

Electroosmotic dewatering of clays. I. Influence of ...

Apr 01, 1983· Electroosmotic dewatering of sedimented suspensions of sodium kaolinite clay, both partly and fully drained, was studied using inert electrodes at voltages from 1 V to 50 V. Dewatering at each voltage slowed down when 45–50 wt% solids was reached, eventually stopped.

Electroosmotic Dewatering | Products & Suppliers ...

Typically electroosmotic dewatering of clay-rich materials is of the order of 1 to 4 orders of magnitude faster than hydraulic dewatering, with a typical value of electro-osmotic permeability (ke) for a …

Pressure electroosmotic dewatering with continuous …

Pressurised electroosmotic dewatering (PED) is usually implemented in classical filters with the electrodes making a direct contact with the material or the filter cloths. Thus, electrolysis products generated at the electrodes (gas, ions) tend to accumulate in the solid/liquid mixture being dewatered.

Electroosmotic dewatering of cellulose nanocrystals

One of the main challenges for industrial production of cellulose nanocrystals is the high energy demand during the dewatering of dilute aqueous suspensions. It is addressed in this study by utilising electroosmotic dewatering to increase the solid content of suspensions of cellulose nanocrystals. The solid content was increased from 2.3 up to 15.3 wt%, i.e. removal of more than 85% of all the ...

ELECTROOSMOTIC DEWATERING PROCESS AND DESIGN EQUATIONS ...

Apr 27, 2007· First, the dewatering mechanism of sludge due to electroosmosis is analyzed theoretically based on an electroosmotic flow through a compressible packed bed of particles, and then its processes under the conditions of both constant electric current and constant voltage are discussed both theoretically and experimentally.

Electroosmotic Dewatering - an overview | ScienceDirect Topics

Table 2 describes the potential applications of dead end electrofiltration and electroosmotic dewatering or draining for several industrial sectors. Investigations carried out on both dead end electrofiltration and pressurized electroosmotic dewatering show the potential of those techniques (1) to dewater (or concentrate) mineral slurry and biological suspension by accelerating the solid ...

Electroosmosis - an overview | ScienceDirect Topics

The earliest papers about electroosmotic dewatering were presented in the works of Casagrande in 1950s [129–131]. In recent decades, some researches have investigated the use of electro-dewatering to remove water from different materials such as clay [132–134], tomato paste suspension [135,136], food processing [137], vegetable sludge ...

Electro-Osmotic Dewatering (EOD) of Bio-Materials ...

The electroosmotic dewatering efficiency under the constant electric current is compared with that under the constant voltage, concerning dewatering rate, water content in dewatered sludge and ...

ELECTRO-OSMOTIC DEWATERING OF ANAEROBICALLY AND ...

ELECTRO-OSMOTIC DEWATERING OF ANAEROBICALLY AND AEROBICALLY STABILISED SLUDGE. @inproceedings {Gronchi2016ELECTROOSMOTICDO, title= {ELECTRO-OSMOTIC DEWATERING OF ANAEROBICALLY AND AEROBICALLY STABILISED SLUDGE}, author= {P. Gronchi and A. D. Forno and S. Visigalli and R. Canziani}, year= {2016} } P. Gronchi, A. D. Forno, +1 …

PED: pressurized electroosmotic dewatering

electroosmotic dewatering (FED) of ultra-fine coal suspensions. The tests show that FED increases the dewatering rate and decreases the final moisture content as compared to conventional processes. Other slurries, slimes and sludges have also been dewatered using the FED process and the results have proven that the FED process is effective with ...

Electroosmotic flows in sludge at dewatering.

Electroosmotic dewatering of activated sludge is an important transport process playing a critical role in electroosmotic dewatering of sludge. In the present work, a comprehensive physical model considering both pressure-driven and electroosmosis-driven flows in an activated sludge floc was developed and numerically solved. Meshes were produced via scanning images based on real sludge flocs.

Electroosmotic dewatering: an efficient method of sludge ...

The purpose of this work is to summarize our latest research results about constant- current electro-osmotic dewatering (EOD) as an efficient method for sludge management. The Terzaghi-Voigt combined model is used for the analysis of electroosmotic dewatering (EOD) of various solid-liquid systems by considering the creep deformation of materials.

Electroosmotic dewatering of cellulose nanocrystals

Electroosmotic dewatering equipment The experimental equipment used for the electroos-motic dewatering experiments has been described in a previous study on local filtration properties during electro-assistedfiltration(Wetterlingetal.2017b),see Fig. 1. The dewatering cell is cylindrical, with an Cellulose (2018) 25:2321–2329 2323 123

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22. Yu XY (Yu Xiaoyan), Zhang ST (Zhang Shuting), Xu H (Xu Hui), Zheng L (Zheng Lei), Lu XB (Lue Xuebin), Ma DG (Ma Degang). Influence of Filter Cloth on the Cathode on the Electroosmotic Dewatering of Activated Sludge.

Electroosmotic dewatering of dredged sediments: Bench ...

Jan 01, 2006· Electroosmotic dewatering essentially involves applying a small electric potential across the sediment layer, thereby inducing rapid flow as a result of physico-chemical and electrochemical processes. A series of bench-scale electrokinetic experiments were conducted on actual dredged sediment samples from the Indiana Harbor to investigate ...

(PDF) Pressure electroosmotic dewatering with continuous ...

Pressure electroosmotic dewatering with continuous removal of electrolysis products. Download. Related Papers. Sedimentation and water electrolysis effects in electrofiltration of kaolin suspension. By olivier larue. Direct contact membrane distillation of Moroccan olive mill wastewater.

Electrokinetic Dewatering of Sewage Sludge with Fixed and ...

Jan 01, 2016· This paper presents a laboratory study on electrokinetic dewatering (EKD) of sewage sludge with fixed and moving electrodes. The experiments with fixed electrodes were conducted in two purposely designed Perspex cylinders to investigate the mechanism of attenuation in electroosmotic flow and dewatering efficiency.

Influence of Chemical Conditioning on Electroosmotic ...

Applying electroosmosis to sludge dewatering practically, methods for improving electroosmotic dewatering must be explored. The influence of initial pH, adding Al2 (SO4)3 dose and ash content in sludge on electroosmotic dewatering behavior was investigated. The results show that acid or alkaline environment is unfavorable for electroosmotic dewatering, especially initial pH of sludge closing ...

Title: Design and modelling of electroosmotic dewatering

The results showed that electroosmotic dewatering of sludge is both feasible and potentially economic. It is also shown that the use of the Helmholtz-Smolucowski flow eqPation, together with the assumptions of no electrochemical reaction and a constant electroosmotic permeability, to predict the dewatering process is not sound.

Electrode kinetic and electro-kinetic effects in ...

May 01, 1997· Lockhart`s remarks on the author`s previous interpretation of the electrochemical aspects of the electroosmotic dewatering (EOD) of clay suspensions are analyzed to provide some further clarification. Based on Lockhart`s excellent work, the authors put forward here novel electrochemical ...

Electroosmotic dewatering of cellulose nanocrystals ...

10%· Mar 06, 2018· Electroosmotic dewatering equipment. The experimental equipment used for the electroosmotic dewatering experiments has been described in a previous study on local filtration properties during electro-assisted filtration (Wetterling et al. 2017b), see Fig. 1. The dewatering cell is cylindrical, with an internal diameter of 60 mm and a height of ...

Electro-Osmotic Dewatering under Electro-Osmotic Pulse ...

dewatering. In this study, electro-osmotic dewatering under pulse conditions was experimentally investigated for electrode polarity reversals. During the dewatering process, the pulse electric field was able to reduce the hindrance caused by the DC, resulting in an increased final dewatered amount relative to that under a DC electric field.

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