Removal of heavy metals from fly ash and the impact on its quality

2002 ◽  
Vol 77 (3) ◽  
pp. 389-395 ◽  
Author(s):  
Henk W Nugteren ◽  
Maria Janssen-Jurkovícová ◽  
Brian Scarlett
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Removal Of Heavy Metals ◽  
The Impact

Impact of solution variables on the removal of heavy metals from wastewaters by a recycled iron sorbent

2000 ◽  
Vol 42 (1-2) ◽  
pp. 347-352
Author(s):  
E.H. Smith ◽  
S. Chatterjee
Keyword(s):  
Heavy Metals ◽  
Oxalic Acid ◽  
Metal Speciation ◽  
Surface Finishing ◽  
Complexing Agents ◽  
Lead Removal ◽  
Adsorption Equilibria ◽  
Removal Of Heavy Metals ◽  
Cadmium And Lead ◽  
The Impact

Waste shot-blast fines from surface finishing processes have been demonstrated to be effective for removing heavy metals from solution by adsorption.The technology offers the potential for inexpensive recovery and reuse of a material normally discarded as a solid waste. While metal removals compare favorably with those achieved by commercial sorbents, applications issues such as the impact of background metal-complexing agents require investigation. The presence of oxalic acid, a complexing organic compound, impacted cadmium and lead adsorption in accordance with predictions from metal speciation equilibria; i.e., a small but measurable reduction in lead removal was observed, but cadmium adsorption was relatively unaffected. The effects were repeated in dynamic column experiments, with lead removals reduced by 15 to 20% in the presence of the ligand. Efforts to model adsorption equilibria in the presence of oxalic acid did not fully capture the reduced lead removal, presumably because the model does not consider the complete formation of metal-oxalic acid complexes prior to contact with the sorbent.

Removal of heavy metals from fly ash leachate using combined bioelectrochemical systems and electrolysis

2014 ◽  
Vol 264 ◽  
pp. 1-7 ◽  
Author(s):  
Hu-Chun Tao ◽  
Tao Lei ◽  
Gang Shi ◽  
Xiao-Nan Sun ◽  
Xue-Yan Wei ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Bioelectrochemical Systems ◽  
Removal Of Heavy Metals

scholarly journals Heterogeneous biochars from agriculture residues and coal fly ash for the removal of heavy metals from coking wastewater

RSC Advances ◽  
2019 ◽  
Vol 9 (28) ◽  
pp. 16018-16027 ◽  
Author(s):  
Lihui Gao ◽  
Jillian L. Goldfarb
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Wheat Straw ◽  
Adsorption Mechanism ◽  
Coal Fly Ash ◽  
Coking Wastewater ◽  
Chemical Adsorption ◽  
Agriculture Residues ◽  
Removal Of Heavy Metals

Heterogeneous biochar via pyrolysis of wheat straw and fly ash with chemical adsorption mechanism; cobalt shows higher capacity and rate.

Removal of Heavy Metals from Aqueous Solution by Fly Ash

2001 ◽  
Vol 4 (3) ◽  
pp. 77-83 ◽  
Author(s):  
Hee-chan Cho ◽  
Dal-young Oh ◽  
Hyo-Taek Chon
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Fly Ash ◽  
Removal Of Heavy Metals

Enhanced Electrokinetic Removal of Heavy Metals in MSWI Fly Ash Assisted by Cation Exchange Membranes

2011 ◽  
Vol 84-85 ◽  
pp. 626-630 ◽  
Author(s):  
Xi Peng ◽  
Bin Quan Jiao ◽  
Lin Yu ◽  
Dong Wei Li ◽  
Ke Yang
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Cation Exchange ◽  
Electroosmotic Flow ◽  
Metal Extraction ◽  
Mswi Fly Ash ◽  
Assisted Extraction ◽  
Removal Of Heavy Metals ◽  
Trial Test ◽  
Exchange Membrane

Since MSWI fly ash enriches heavy metals and many toxic components and these components would potentially leach when the ashes are land filled, it is regulated as hazardous waste in many countries. Electrokinetic removal, an electrochemically assisted extraction method, has recently been adopted as a new method for removal of heavy metals from MSWI fly ashes. But the generation of metal hydroxide precipitation near the cathode decreased conductivity of electrokinetic removal system and limited metal extraction from the sample area. In this study, cation exchange membrane was used in electrokinetic removal experiment to improve this method. After 192 hours of electrokinetic removal, about 15%Cd,20%Pb, 30% Zn, and 10% As was removed from 2.850kg MSWI fly ash. It showed positive effect compared to the trial test. But there still exists some problems, such as low removal efficiency. Further work should be done to solve it.Moreover, the high conductivity in fly ash limits the current , which in turn causes low electroosmotic flow. While electroosmotic flow is the main factor leting the heavy meatals release from fly ash, it would become the focus in further experiment to look for ways increasing the electroosmotic flow in sample cell.

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