Beneficial metal stabilization mechanisms using simulated sludge incineration ash for ceramic products

BACKGROUND This study explored the feasibility of a waste to resource strategy by using incineration ash of sewage/waste-water treatment sludge as part of the raw materials for ceramic processing. Reactions between metal oxides (CuO, ZnO), common metal containing form in incineration ash, and kaolinite based ceramic raw materials (kaolinite, mullite) were observed. The metal incorporation behavior was determined using quantitative X-ray diffraction analysis. RESULTS The optimal sintering temperature for copper incorporation was 1000°C, with CuAl2O4 phase dominating the system. For zinc incorporation, ZnAl2O4 and Zn2SiO4 formed in competition, with ZnAl2O4 found to predominate at temperatures higher than 1150°C. To determine the preferred phases for long-term metal stability, a prolonged toxicity characteristic leaching procedure was carried out to quantify metal leaching performance and explore the leaching behavior. Metal leaching following incorporation in spinel leachates was significantly lower than those in oxide and silicate leachates, and the surface leaching behavior was also analyzed for the consideration of long-term metal stability. CONCLUSION The overall results indicate that spinel formation is a preferred metal stabilization mechanism when incorporating sludge incineration ash into ceramic products and is also a key control step to safely implement this waste to resource strategy for a more sustainable engineering solution. © 2013 Society of Chemical Industry

[1]  H. Rietveld.  A profile refinement method for nuclear and magnetic structures , 1969 .

[2]  K. Jacob,et al.  Thermodynamics of CuAlO2 and CuAl2O4 and Phase Equilibria in the System Cu2O‐CuO‐Al2O3 , 1975 .

[3]  J. O. Thomas,et al.  Least-squares structure refinement based on profile analysis of powder film intensity data measured on an automatic microdensitometer , 1977 .

[4]  Ole Hjelmar,et al.  Disposal strategies for municipal solid waste incineration residues , 1996 .

[5]  J. Thonstad,et al.  The solubility of ZnO and ZnAl2O4 in cryolite melts , 1997 .

[6]  S. Galí,et al.  Quantitative Rietveld analysis of aluminous cement clinker phases , 2000 .

[7]  N. Adhoum,et al.  Modified activated carbon for the removal of copper, zinc, chromium and cyanide from wastewater , 2002 .

[8]  Irene M.C. Lo,et al.  Geotechnical characterization of dewatered sewage sludge for landfill disposal , 2002 .

[9]  C. Chow,et al.  Copper toxicity, oxidative stress, and antioxidant nutrients. , 2003, Toxicology.

[10]  Tomas Martišius,et al.  Influence of copper oxide on mullite formation from kaolinite , 2003 .

[11]  G. Walenta,et al.  Advances in quantitative XRD analysis for clinker, cements, and cementitious additions , 2004, Powder Diffraction.

[12]  Duu-Jong Lee,et al.  Characteristics of air pollution control residues of MSW incineration plant in Shanghai. , 2004, Journal of hazardous materials.

[13]  H. Schneider,et al.  Mullite: SCHNEIDER:MULLITE O-BK , 2005 .

[14]  J. Leckie,et al.  Nickel stabilization efficiency of aluminate and ferrite spinels and their leaching behavior. , 2006, Environmental science & technology.

[15]  J. Leckie,et al.  Spinel formation for stabilizing simulated nickel-laden sludge with aluminum-rich ceramic precursors. , 2006, Environmental science & technology.

[16]  Johannes Martin,et al.  Drivers for innovation in waste-to-energy technology , 2007, Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.

[17]  Anastasia Zabaniotou,et al.  Utilization of sewage sludge in EU application of old and new methods--A review , 2008 .

[18]  G. Mckay,et al.  Use of incineration MSW Ash: A Review , 2010 .

[19]  K. Shih,et al.  Copper aluminate spinel in the stabilization and detoxification of simulated copper-laden sludge. , 2010, Chemosphere.

[20]  E. Katsou,et al.  Industrial wastewater pre-treatment for heavy metal reduction by employing a sorbent-assisted ultrafiltration system. , 2011, Chemosphere.

[21]  J. Havlica,et al.  The kinetic analysis of the thermal decomposition of kaolinite by DTG technique , 2011 .