Electrical field: A historical review of its application and contributions in wastewater sludge dewatering
Identifieur interne : 007900 ( Main/Exploration ); précédent : 007899; suivant : 007901Electrical field: A historical review of its application and contributions in wastewater sludge dewatering
Auteurs : Akrama Mahmoud [France] ; Jérémy Olivier [France] ; Jean Vaxelaire [France] ; Andrew F. A. Hoadley [Australie]Source :
- Water research : (Oxford) [ 0043-1354 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Eau usée, Déshydratation, Champ électrique, Electrocinétique, Séparation solide liquide, Consommation énergie, Industrie céramique, Particule fine, Boue résiduaire, Industrie pharmaceutique, Industrie alimentaire, Suspension particule, Charge superficielle, Charge électrique, Electroosmose, Analyse élémentaire, Milieu poreux, Traitement déchet, Pollution sol, Traitement électrochimique, Aérosol, Analyse chimique, Pollution air.
- Wicri :
English descriptors
- KwdEn :
- Aerosols, Air pollution, Ceramics industry, Chemical analysis, Dehydration, Electric charge, Electric field, Electrochemical treatment, Electrokinetics, Electroosmosis, Elementary analysis, Energy consumption, Fine particle, Food industry, Particle suspension, Pharmaceutical industry, Porous medium, Sewage sludge, Soil pollution, Solid liquid separation, Surface charge, Waste treatment, Waste water.
Abstract
Electric field-assisted dewatering, also called electro-dewatering, is a technology in which a conventional dewatering mechanism such a pressure dewatering is combined with electrokinetic effects to realize an improved liquid/solids separation, to increase the final dry solids content and to accelerate the dewatering process with low energy consumption compared to thermal drying. Electro-dewatering is not a new idea, but the practical industrial applications have been limited to niche areas in soil mechanics, civil engineering, and the ceramics industry. Recently, it has received great attention, specially, in the fields of fine-particle sludge, gelatinous sludge, sewage sludge, pharmaceutical industries, food waste and bull kelp, which could not be successfully dewatered with conventional mechanical methods. This review focuses on the scientific and practical aspects of the application of an electrical field in laboratory/industrial dewatering, and discusses this in relation to conventional dewatering techniques. A comprehensive bibliography of research in the electro-dewatering of wastewater sludges is included. As the fine-particle suspensions possess a surface charge, usually negative, they are surrounded by a layer with a higher density of positive charges, the electric double layer. When an electric field is applied, the usually negative charged particles move towards the electrode of the opposite charge. The water, commonly with cations, is driven towards the negative electrode. Electro-dewatering thus involves the well-known phenomena of electrophoresis, electro-osmosis, and electromigration. Following a detailed outline of the role of the electric double layer and electrokinetic phenomena, an analysis of the components of applied voltage and their significance is presented from an electrochemical viewpoint. The aim of this elementary analysis is to provide a fundamental understanding of the different process variables and configurations in order to identify potential improvements. Also discussed herein is the investigation of the electrical behaviour of a porous medium, with particular emphasis on porous medium conductivity determination.
Affiliations:
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Hoadley</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Chemical Engineering, Building 35, Clayton Campus, Monash University</s1><s2>Victoria 3800</s2><s3>AUS</s3><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Victoria 3800</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Water research : (Oxford)</title><title level="j" type="abbreviated">Water res. : (Oxf.)</title><idno type="ISSN">0043-1354</idno><imprint><date when="2010">2010</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Water research : (Oxford)</title><title level="j" type="abbreviated">Water res. : (Oxf.)</title><idno type="ISSN">0043-1354</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aerosols</term><term>Air pollution</term><term>Ceramics industry</term><term>Chemical analysis</term><term>Dehydration</term><term>Electric charge</term><term>Electric field</term><term>Electrochemical treatment</term><term>Electrokinetics</term><term>Electroosmosis</term><term>Elementary analysis</term><term>Energy consumption</term><term>Fine particle</term><term>Food industry</term><term>Particle suspension</term><term>Pharmaceutical industry</term><term>Porous medium</term><term>Sewage sludge</term><term>Soil pollution</term><term>Solid liquid separation</term><term>Surface charge</term><term>Waste treatment</term><term>Waste water</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Eau usée</term><term>Déshydratation</term><term>Champ électrique</term><term>Electrocinétique</term><term>Séparation solide liquide</term><term>Consommation énergie</term><term>Industrie céramique</term><term>Particule fine</term><term>Boue résiduaire</term><term>Industrie pharmaceutique</term><term>Industrie alimentaire</term><term>Suspension particule</term><term>Charge superficielle</term><term>Charge électrique</term><term>Electroosmose</term><term>Analyse élémentaire</term><term>Milieu poreux</term><term>Traitement déchet</term><term>Pollution sol</term><term>Traitement électrochimique</term><term>Aérosol</term><term>Analyse chimique</term><term>Pollution air</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Eau usée</term><term>Déshydratation</term><term>Industrie pharmaceutique</term><term>Industrie alimentaire</term><term>Aérosol</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Electric field-assisted dewatering, also called electro-dewatering, is a technology in which a conventional dewatering mechanism such a pressure dewatering is combined with electrokinetic effects to realize an improved liquid/solids separation, to increase the final dry solids content and to accelerate the dewatering process with low energy consumption compared to thermal drying. Electro-dewatering is not a new idea, but the practical industrial applications have been limited to niche areas in soil mechanics, civil engineering, and the ceramics industry. Recently, it has received great attention, specially, in the fields of fine-particle sludge, gelatinous sludge, sewage sludge, pharmaceutical industries, food waste and bull kelp, which could not be successfully dewatered with conventional mechanical methods. This review focuses on the scientific and practical aspects of the application of an electrical field in laboratory/industrial dewatering, and discusses this in relation to conventional dewatering techniques. A comprehensive bibliography of research in the electro-dewatering of wastewater sludges is included. As the fine-particle suspensions possess a surface charge, usually negative, they are surrounded by a layer with a higher density of positive charges, the electric double layer. When an electric field is applied, the usually negative charged particles move towards the electrode of the opposite charge. The water, commonly with cations, is driven towards the negative electrode. Electro-dewatering thus involves the well-known phenomena of electrophoresis, electro-osmosis, and electromigration. Following a detailed outline of the role of the electric double layer and electrokinetic phenomena, an analysis of the components of applied voltage and their significance is presented from an electrochemical viewpoint. The aim of this elementary analysis is to provide a fundamental understanding of the different process variables and configurations in order to identify potential improvements. Also discussed herein is the investigation of the electrical behaviour of a porous medium, with particular emphasis on porous medium conductivity determination.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Aquitaine</li><li>Nouvelle-Aquitaine</li></region><settlement><li>Pau</li></settlement></list><tree><country name="France"><region name="Nouvelle-Aquitaine"><name sortKey="Mahmoud, Akrama" sort="Mahmoud, Akrama" uniqKey="Mahmoud A" first="Akrama" last="Mahmoud">Akrama Mahmoud</name></region><name sortKey="Olivier, Jeremy" sort="Olivier, Jeremy" uniqKey="Olivier J" first="Jérémy" last="Olivier">Jérémy Olivier</name><name sortKey="Vaxelaire, Jean" sort="Vaxelaire, Jean" uniqKey="Vaxelaire J" first="Jean" last="Vaxelaire">Jean Vaxelaire</name></country><country name="Australie"><noRegion><name sortKey="Hoadley, Andrew F A" sort="Hoadley, Andrew F A" uniqKey="Hoadley A" first="Andrew F. A." last="Hoadley">Andrew F. A. 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