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A platform for research: civil engineering, architecture and urbanism
Solidification of electroplating sludge using alkali-activated pulverized fuel ash as cementitious binder
This work investigated the potential for utilization of alkali-activated PFA as solidification binder to treat electroplating sludge. The sludge was solidified using 30 wt.% of lime and 70 wt.% of PFA. Two alkali activators, Na2SiO3 and Na2CO3, were added at 0, 4, 6, and 8 wt.%. Results showed that early strength development of lime-PFA cements with Na2SiO3 and Na2CO3 was considerably higher than those without. Addition of electroplating sludge resulted in reduced strength. The strength reduction was greater when 4% Na 2SiO3 activator was used than when 8% Na 2CO3 activator was used. A higher pH of Na 2SiO3 solution (pH=13.5) compared to that of Na 2CO3 solution (pH=11.9) resulted in resolubilization of metal hydroxides from the electroplating sludge, which competed with calcium ion for soluble silicate. In addition, Pb, Cd, and Cu were not found in the toxicity characteristic leaching procedure (TCLP) leachates. Cr, Zn, and Fe were detected and in some cases Cr exceeded U.S. EPA allowable limits.
Solidification of electroplating sludge using alkali-activated pulverized fuel ash as cementitious binder
This work investigated the potential for utilization of alkali-activated PFA as solidification binder to treat electroplating sludge. The sludge was solidified using 30 wt.% of lime and 70 wt.% of PFA. Two alkali activators, Na2SiO3 and Na2CO3, were added at 0, 4, 6, and 8 wt.%. Results showed that early strength development of lime-PFA cements with Na2SiO3 and Na2CO3 was considerably higher than those without. Addition of electroplating sludge resulted in reduced strength. The strength reduction was greater when 4% Na 2SiO3 activator was used than when 8% Na 2CO3 activator was used. A higher pH of Na 2SiO3 solution (pH=13.5) compared to that of Na 2CO3 solution (pH=11.9) resulted in resolubilization of metal hydroxides from the electroplating sludge, which competed with calcium ion for soluble silicate. In addition, Pb, Cd, and Cu were not found in the toxicity characteristic leaching procedure (TCLP) leachates. Cr, Zn, and Fe were detected and in some cases Cr exceeded U.S. EPA allowable limits.
Solidification of electroplating sludge using alkali-activated pulverized fuel ash as cementitious binder
Asavapisit, Suwimol (author) / Chotklang, Duangruedee (author)
Cement and Concrete Research ; 34 ; 349-353
2004
5 Seiten, 19 Quellen
Article (Journal)
English
| British Library Online Contents | 2004
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