New hybrid electrocoagulation membrane process for removing selenium from industrial wastewater

Mavrov, V.; Stamenov, Stefan; Todorova, E. V.; Chmiel, H.; Erwe, T.

doi:10.1016/j.desal.2006.06.005

Cited by 143 publications

(70 citation statements)

References 6 publications

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“…A variety of treatment technologies have been reported to remove selenium from contaminated waters ( and Selleck, 1992;Gallup, 1996; Frankenberger et al, 2004;Mavrov et al, 2006). Traditional treatment methods (e.g., coagulation, lime softening and sand filtration) are reported not effective (Kapoor et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…Reverse osmosis and nanofiltration techniques are rather uncommon because pre-treatment for both these methods is complicated. Emulsion liquid membrane is preferential in removing sulfate instead of selenate and is pH dependent (Mavrov et al, 2006;Gleason et al, 1996). 3) Se reduction.…”

Section: Introductionmentioning

confidence: 99%

“…Selenate can be reduced to selenite or elemental Se to facilitate its removal. However generation of large volumes of sludge, high cost of reagents and interferences by dissolved oxygen and other anions are factors that affect the wide application of this technique (Mavrov et al, 2006). 4) Biological processes.…”

Section: Introductionmentioning

confidence: 99%

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Continuation of Crosscutting Technology Development at Cast

Yoon¹

2012

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5Figure ES-2. Optimization of conditions for leaching Coal B with hydrochloric acid solutions (The selection of time/pH conditions in the dark green region should result in the removal of >30% of the sodium. Note also that a flag has been added to show the amount of sodium in the leach solution, 35% sodium removal, and the sodium content in the product ash). Coal DCoal D showed significantly greater sodium removal than Coal B for similar treatment conditions. The treatability of Coal B is demonstrated in Figures ES3 to ES5. . Coal D leach results for hydrochloric acid solutions (Greater than 75% of the sodium was removed using pH 3 acidic solutions at a 1-hour treatment time. The initial sodium, reported as sodium oxide in the ash, was 6.16 %. The removal of over one-half of the sodium can be achieved using conditions of pH 5, 0.5 hours). Recommended Future StudiesIt is recommended that future studies include, but not be limited to:• Investigation to determine if multiple leach solution contacts with new coal will allow recycle of the leach solution without detrimentally affecting the leachability of the coals and to produce a concentrated sodium bearing solution in order to limit the amount of leach solution that would have to be treated prior to water recycle or disposal.• Water cleanup will be required because of the relatively high sodium and chloride or sulfate content.• Evaluation of where and how the leachate could be introduced into the coal preparation treatment system. • Evaluation of the possible impact of pretreatment on the subsequent shipping and combustion processes.• The anticipated cost of the sodium cleansing treatment and subsequent water treatments. INTRODUCTION BackgroundThe US Department of Energy (DOE) Center for Advanced Separation Technologies (CAST), Great Northern Properties (GN), and the Montana Board Research and Commercialization Technology (MBRCT) are funding this project. The project is being administered and the research directed and conducted at CAMP. The intent of the project is to identify, and validate selected currently used (or previously studied) removal and sodium recovery treatment alternative(s) using laboratory bench-scale tests on four Montana coal samples. If the coals cannot be effectively treated by known techniques, alternative treatments will be developed. The evaluation of selected sodium removal technologies are presently underway and the following four stages are being and will be followed in future work: the successful removal of sodium from the coal so that the ash will content less than three percent, the rate at which the sodium ions are removed, characterization of the waste produced by sodium removal processing, and the overall economics of viable processes. Not part of the initial Project, but a necessary follow-up, will be the scale-up of the most appropriate sodium removal technology(s) in applications with companies using Clean Coal Technology to demonstrate sodium removal process or processes on a pilot scale. Objective and ApproachThe overall ob...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Continuation of Crosscutting Technology Development at Cast

Yoon¹

2012

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“…Selenium is widely used for toners of photocopiers and laser printers, shampoo, glazing solvent, diodes, and photocells. Its removal methods are precipitation with ferrihydrite (EPA Report, 2001), membrane filtration (Mavrov et al, 2006;Prats et al, 2000), microbial reduction (Catal et al, 2009;Yee et al, 2007), and ion exchange (Breen, 1999). The adsorption of selenium in oxides has been characterized through a number of studies (Duc et al, 2003;Frost and Griffin, 1977;Kuan et al, 1998;Parida et al, 1997;Peak and Sparks, 2002;Rovira et al, 2008;Wijnja and Schulthess, 2000;You et al, 2001;Zhang et al, 2008, Zhuang andYu, 2002).…”

Section: Introductionmentioning

confidence: 99%

Feasibility study on cross-linked biopolymeric concrete encapsulating selenium glass wastes

Kim

Park

Yen

2012

Journal of the Air & Waste Management Association

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Feasibility study was conducted to encapsulate the selenium (Se) contained in glass waste, using the biopolymer-modified concrete. Biopolymer has unique characteristics to provide the chemical sites to metals or toxic compounds through the threedimensional cross-linked structure. Very minute amount of biopolymer enhanced the characteristics of cementitious material. The resulting biopolymeric composite with selenium glass waste showed 20% higher compressive strength than ordinary concrete and the lower leaching concentration than the equipment detection limit. For a qualitative measurement, X-ray diffraction (XRD; X-ray powder diffractogram) was used to characterize the biopolymeric concrete. The optimum waste content percentage with appropriate biopolymer concrete mixture ratio was identified for its possible commercial use.Implications: The selenium waste from a glass manufacturer initiated this study. Biopolymer-modified concrete system is of importance in encapsulating hazardous wastes, which is unique, unlike the conventional waste solidification method.

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“…Several advanced techniques exist for the reduction of the environmental impact of industrial wastewater containing heavy metal ions, such as reverse osmosis (Gupta et al 2012), advanced oxidation (Oller et al 2011), ion exchange (Da̧browski et al 2004), solvent extraction (Hall et al 1990), membrane filtration processes (Blöcher et al 2003;Mavrov et al 2006;Paez-Hernandez et al 2005), GAC/O 3 oxidation (Qian (Zhang et al 2012), lime softening (Varga et al 2013), coagulation/flocculation (Amuda et al 2006), electrochemical processes (Ahmad et al 2012), electrocoagulation (Balasubramanian et al 2009;Ratna Kumar et al 2004), chitosan graphene oxide nanocomposites (Shahzad et al 2017) and chemical precipitation (Rathinam et al 2010). These treatment methods have some limitations, which include highenergy requirements, production of oxidation by-products, regeneration requirements during ion exchange, bulk toxic sludge generation in flocculation/coagulation methods, short half-life in ozonation and membrane fouling during the filtration process.…”

Section: Introductionmentioning

confidence: 99%