Full scale electrokinetic dewatering of waste sludge

Raats, M.H.M.; Diemen, A. J. G. van; Lavèn, Jozua; Stein, H.N.

doi:10.1016/s0927-7757(02)00380-1

Cited by 73 publications

(37 citation statements)

References 12 publications

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“…Such approach was demonstrated to accelerate the initial rate of dewatering on a quartz sand suspension with D 50 of 2 m and electric field parallel to filtrate flow, though limited improvement was found in the final cake moisture content (Weber & Stahl, 2002). Theoretical modelling by Raats, et al (2002) showed an increased effectiveness of electrofiltration relative to conventional filtration of treating a concentrated sludge primarily consisted of micron and sub-micron sized particles. Indeed, a recent study by Loginov, et al (2013) with 23.4% (w/w) sodium bentonite (D 50 = 3 m) in orthogonal electric field showed similar results as Weber & Stahl (2002).…”

Section: Filtration and Electrofiltrationmentioning

confidence: 99%

“…For electrofiltration, periodic cathode cleaning is necessary for saline suspensions due to ion reduction and deposition of potentially insoluble hydroxides. Finally, the anode material is subject to oxidative corrosion, thus it is imperative to have relatively inert materials, such as those used by Raats, et al (2002), to ensure the longevity of the process and trouble-free operations. These complications may have hindered the progress on systematic studies using pilot and full-scale equipment, and created difficulties in fully assessing its performance (Mahmoud, et al, 2010).…”

Section: Filtration and Electrofiltrationmentioning

confidence: 99%

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Current state of fine mineral tailings treatment: A critical review on theory and practice

Wang

Harbottle

Liu

et al. 2014

Minerals Engineering

334

169

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Highlights Presented facts on escalating generation of fine mineral tailings worldwide.  Overview of coal, alumina, oil sands, and base metals tailings characteristics.  Reviewed theoretical and industrial developments for tailings management.  Determined numerous knowledge gaps between current theories and practices.  Identified opportunities for improvement towards more sustainable practices. Graphical AbstractEvolution of fine mineral tailings treatment objectives.Figures "Flocculated solids" and "Stackable solids" are adopted from Alamgir, et al. (2012), permission pending. The last figure "Reclaimed land" is adopted from Golder Associates (2009), permission pending. AbstractThe mining industry produces fluid fine mineral tailings on the order of millions of tonnes each year, with billions of tonnes already stored globally. This trend is expected to escalate as demand for mineral products continues to grow with increasingly lower grade ores being more commonly exploited by hydrometallurgy. Ubiquitous presence and enrichment of fine solids such as silt and clays in fluid fine mineral tailings prevent efficient solid-liquid separation and timely re-use of valuable process water. Long-term storage of such fluid waste materials not only incurs a huge operating cost, but also creates substantial environmental liabilities of tailings ponds for mining operators. This review broadly examines current theoretical understandings and prevalent industrial practices on treating fine mineral tailings for greater water recovery and reduced environmental footprint of mining operations.

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Section: Filtration and Electrofiltrationmentioning

confidence: 99%

Section: Filtration and Electrofiltrationmentioning

confidence: 99%

Current state of fine mineral tailings treatment: A critical review on theory and practice

Wang

Harbottle

Liu

et al. 2014

Minerals Engineering

334

169

View full text Add to dashboard Cite

show abstract

“…The anodes used for electrofiltration are often constructed from titanium meshes coated by either mixed metal oxides (Citeau et al 2012;Raats et al 2002) or noble metals (Rabie et al 1994;Saveyn et al 2006) in order to prevent corrosion (Larue et al 2003). The electrolysis reactions at the cathode are:…”

Section: Introductionmentioning

confidence: 99%

Electroosmotic dewatering of cellulose nanocrystals

et al. 2018

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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 water present in the system, at a much lower energy demand than that of thermal drying. Increasing the strength of the electric field increased not only the dewatering rate but also the specific energy demand of the dewatering operation: the electric field strength used in potential industrial applications is thus a trade-off between the rate of dewatering and the energy demand. Additionally, it was found that high local current intensity had the potential of degrading cellulose nanocrystals in contact with the anode. The maximum strength of the electric field applied should therefore be limited depending on the equipment design and the suspension conditions.

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“…Electrically assisted filtration and compression of filter cakes are now advanced at the pilot scale and have revealed promising results. Electrical devices are easily adaptable to the technology of industrial filters such as plate filter press (Kondo and Hiraoka, 1990) and belt filter press (Raats et al, 2002).…”

Section: Introductionmentioning

confidence: 99%