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摘要
The objective of this research was to use a counter-current leaching process (CCLP) with leachate treatment to develop a remediation process for contaminated soils at a small-arms shooting range (SASR). The soil contaminant concentrations were 245mg Cu kg(-1), 3,368mg Pb kg(-1), 73mg Sb kg(-1), and 177mg Zn kg(-1). The CCLP includes three acid leaching steps (1M H2SO4 + 4M NaCl, t = 1h, T = 20 degrees C, soil suspension = 100g L-1), followed by one water rinsing step (1h). Seven counter-current remediation cycles were completed, and the average resulting metal removals were 93.2 +/- 3.5% of Cu, 91.5 +/- 5.7% of Pb, 82.2 +/- 10.9% of Sb, and 30.0 +/- 11.4% of Zn. The metal leaching performances decreased with the number of completed cycles. Soil treated with the CCLP with leachate treatment process met the USEPA threshold criteria of 5mg Pb L-1 in the TCLP leachate. The CCLP allows a decrease of the water use by 32.9m(3) t(-1) and the chemicals' consumption by approximately 2,650kg H2SO4, 6,014kg NaCl, and 1,150kg NaOH per ton of treated soil, in comparison to standard leaching processes. This corresponds to 78%, 69%, 83%, and 67% of reduction, respectively.
- 出版日期2014-1-1
