Impact on Leaching & Retention of Metals from High Temperature Reaction of CCA Metals with Alumino-Silicate Sorbents

Authors

  • Anadi Misra University of Florida http://orcid.org/0000-0001-6269-6726
  • Brajesh K Dubey Indian Institute of Technology, Kharagpur, India
  • Chang-Yu Wu University of Florida, Gainesville, FL, USA
  • Timothy G Townsend University of Florida, Gainesville, FL, USA
  • Helena M Solo-Gabriele University of Florida, Gainesville, FL, USA

Keywords:

Source Modification, Chromium, Copper, Wood Preservative, Incineration, Adsorption, Leachate Management

Abstract

Past studies have shown that many alumino-silicate mineral sorbents are effective in controlling heavy metal emission during incineration. The objective of this study was to identify Al-Si based mineral sorbents that can minimize leaching of heavy metals from the incinerator ash of Chromated Copper Arsenate (CCA-) treated wood. Experiments were carried out using CCA metal spikes combined with Al-Si sorbents, heated to 700 oC, 900 oC and 1100 oC for 30 minutes. The residual ash was leached using the toxicity characteristic leaching procedure (TCLP).  X-Ray Diffraction (XRD) analysis was conducted to determine the crystalline speciation of the products. Results showed that low leaching was observed for chromium, below the 5 mg/L TC limit, by alumina and silica at all temperatures, and kaolin at higher temperatures (900 oC and 1100 oC). For copper, all sorbents displayed low leaching values (< 51 mg/l) as compared to the baseline. For arsenic, all sorbents exceeded the TC limit.  Speciation characterization results reveal the formation of several metal-metal and metal-mineral compounds that may have resulted in different leaching behaviors of each metal-sorbent pair under different combustion conditions. The results suggest a combination of sorbents at different stages of the combustion process can be effective to control the leaching of CCA metals.

Author Biographies

Anadi Misra, University of Florida

Student

Brajesh K Dubey, Indian Institute of Technology, Kharagpur, India

Associate Professor

Environmental Engineering and Management Division, Department of Civil Engineering, Indian Institute of Technology, Kharagpur, WB 721302, India

Chang-Yu Wu, University of Florida, Gainesville, FL, USA

Professor & Department Head

Department of Environmental Engineering Sciences, Engineering School of Sustainable Infrastructure and Environment, University of Florida, Gainesville, FL 32611-6450 USA

Timothy G Townsend, University of Florida, Gainesville, FL, USA

Professor

Department of Environmental Engineering Sciences, Engineering School of Sustainable Infrastructure and Environment, University of Florida, Gainesville, FL 32611-6450 USA

Helena M Solo-Gabriele, University of Florida, Gainesville, FL, USA

Professor & Associate Dean for Research

Department of Civil, Architectural, and Environmental Engineering, University of Miami, Coral Gables, FL 33146-0630 USA

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Published

2015-12-08

How to Cite

Misra, A., Dubey, B. K., Wu, C.-Y., Townsend, T. G., & Solo-Gabriele, H. M. (2015). Impact on Leaching & Retention of Metals from High Temperature Reaction of CCA Metals with Alumino-Silicate Sorbents. American Scientific Research Journal for Engineering, Technology, and Sciences, 14(3), 161–176. Retrieved from https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1066