From ash to eco-friendly solution for hazardous metals removal

Scientists suggest a new method to transform power plant ash into materials that could be used for nuclear waste treatment or soil remediation. Recycle ash

The world’s power plants produce about 600 million tones of coal ash every year. If nothing is done about it, this sort of waste might damage the environment. A group of scientists from Greece and Romania suggests a method to turn the ashes produced into an eco-friendly solution.

Ashes are chemically similar to volcanic precursors of natural zeolites. These are typical adsorbents in separation and refinery facilities. The scientists used ash taken from the Iasi power plant in Romania and through a simple, low-cost method were successful to produce adsorbents from it. They have modified the power plant ash by hydrothermal treatment and ultrasonic activation in an alkaline medium (5M NaOH). Furthermore they investigated the effectiveness of the new synthesized sorbents in removing certain metals (Ba, Cd, Cr, Cs, Eu and U) from aqueous solutions. Thanks to NMI3 support, the group could conduct instrumental neutron activation analysis (INAA) experiments at the Reactor Institute Delft to characterise the materials.

The results show that the new materials have enhanced properties with regards to the original ash and proved very efficient in removing hazardous metals from aqueous media. The sorption efficiency was as high as more zeolite formed.

This method could be a cheaper alternative e.g. for nuclear waste treatment or soil remediation while also reducing waste from power plants.

 

Original publication

F. Noli, G. Buema, P. Misaelides and M. Harja (2014), New materials synthesized from ash under moderate conditions for removal of toxic and radioactive metals, Journal of Radioanalytical and Nuclear Chemistry, 1-9 DOI 10.1007/s10967-014-3762-1

 

NMI3 is a European consortium of 18 partner organisations from 12 countries, including all major facilities in the fields of neutron scattering and muon spectroscopy. It receives funding from the European Union’s 7th Framework Programme for research, technological development and demonstration.

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