Neutralization of an extremely acidic sludge and stabilization of heavy metals in flyash aggregates

Polat, Mehmet; Güler, Erkan; Lederman, Eli; Cohen, Haim

doi:10.1016/j.wasman.2006.02.012

Cited by 16 publications

(11 citation statements)

References 18 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Alternatively, as the surface is negatively charged at basic pH, particles with a positive charge will be drawn to the surface of the FA. As it has been reported that the SrCO 3 particles have a positive zeta potential [18,46,47], it is suggested that this is the primary fixation pathway. The electrostatic interaction of the SrCO 3 particles with the FA surface is presented in Fig.…”

Section: Discussionmentioning

confidence: 95%

See 1 more Smart Citation

Coal fly ash as a potential fixation reagent for radioactive wastes

Lieberman

Green

Segev

et al. 2015

Fuel

Self Cite

View full text Add to dashboard Cite

h i g h l i g h t sFly-ash acts as a blocking barrier for radionuclide cations diffusion. Fixation of the radionuclides is via -AlO 2 À /-SiO 3 À anions at the fly ash surface.A novel Sr 90 fixation mode via precipitation and adsorption to the fly ash is found.a r t i c l e i n f o a b s t r a c tIsrael produces $1.3 Mt/year of fly ash (FA), a byproduct of its coal-fired power plants. Due to increasing environmental regulations, these imported coals are processed to reduce the sulfur concentration ($0.6%). These processing methods result in a material that has an enriched alkali/alkali earth component with pozzolanic and basic properties (pH > 10.5). FAs are utilized worldwide, mainly as a cement additive for the construction industry. Recently, it was demonstrated that Class F FA can act as an excellent fixation reagent for acidic wastes from the phosphate or the oil regeneration industries. In the current work the potential utilization of Class F FAs as fixation reagents for low-activity radioactive waste from the nuclear industry was examined. Aqueous solutions containing radionuclide simulants: cesium (Cs + ), strontium, (Sr 2+ ), and cerium (Ce 3+, Ce 4+ ) were used as case studies with promising results. It is suggested that the primary fixation mechanism involves the aluminate/silicate anions at the FA surface. A novel experimental fixation approach utilizing the formation of carbonates is demonstrated and a new interaction mechanism is suggested based on the electrostatic interactions of the positively charged fine precipitates with the negatively charged FA surface.

show abstract

Section: Discussionmentioning

confidence: 95%

“…The possibility of using FA as an effective neutralization and fixation reagent for acidic wastes has been explored and suggested as a more significant economic value added as a utilization method [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Coal fly ash as a potential fixation reagent for radioactive wastes

Lieberman

Green

Segev

et al. 2015

Fuel

Self Cite

View full text Add to dashboard Cite

show abstract

“…Kanungo and Mohapatra [35] proposed a two-step hydrolysis process to explain the decrease of metal ion concentration in solution and relate it to the solubility constants. In addition to the physical adsorption and hydrolysis, Polat et al [36] suggested surface complexation of the metals to explain the metal adsorption in acidic solutions. Polat et al also proposed three consecutive processes for the metal removal for different pH regions.…”

Section: Heavy Metalsmentioning

confidence: 99%

Encapsulating fly ash and acidic process waste water in brick structure

Köseoğlu

Polat

2010

Journal of Hazardous Materials

Self Cite

View full text Add to dashboard Cite

a b s t r a c tFly ash contains metals such as cadmium, iron, lead, aluminum and zinc in its structure in appreciable amounts. These metals can leach out into surface and ground waters if fly ash is not properly disposed of. A similar problem also exists for acidic process waste waters discharged by numerous industries. The purpose of this study was to utilize such wastes as additives in the production of construction quality bricks for the purpose of waste elimination. The bricks produced were subjected to flexural strength and water retention capacity tests along with heavy metal leaching experiments in order to determine the applicability of the procedure and the best possible recipes. This paper summarizes the results obtained in these tests along with the possible mechanisms involved in stabilizing the two wastes in the brick structure.

show abstract

“…The handling and disposal activity of NS are the costliest aspects of industrial wastewater treatment. Up to 60% of the total cost of the operation and maintenance of wastewater treatment plants is connected with sludge management [11]. Landfilling is considered to be the most appropriate choice for this sludge disposal at present [12], but it occupies large areas of land and wastes metal resources.…”

Section: Introductionmentioning

confidence: 99%