Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 244, Issue -, Pages 645-653Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2012.10.060
Keywords
Cadmium; Dissolved organic matter; Fertility; Sludge; Soil washing
Categories
Funding
- National Science Council, Republic of China [NSC 99-2621-M-197-001]
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Soil washing using an acid solution is a common practice for removing heavy metals from contaminated soil in Taiwan. However, serious loss of nutrients from soil is a major drawback of the washing. Distillery sludge can be used to prepare a dissolved organic matter (DOM) solution by extracting its organic constituents with alkaline solutions. This study employed DOM solutions to remediate Cd-contaminated soil (with concentrations up to 21.5 mg kg(-1)) and determine the factors affecting removal of Cd, such as pH, initial concentration of DOM solution, temperature, and washing frequency. When washing with pH 3.0 and 1250 mg L-1 DOM solution, about 80% and 81% of Cd were removed from the topsoil at 27 degrees C and subsoil at 40 degrees C, respectively. To summarize the changes in fertility during DOM washing with various pH solutions: the increase in organic matter content ranged from 7.7% to 23.7%; cation exchange capacity (CEC) ranged from 4.6% to 13.9%; available ammonium (N-NH4) content ranged from 39.4% to 2175%; and available phosphorus content ranged from 34.5% to 182%: Exchangeable K, Ca, and Mg remained in the topsoil after DOM washing, with concentrations of 1.1, 2.4, and 1.5 times higher than those treated with HCl solution at the same pH, respectively. (c) 2012 Elsevier B.V. All rights reserved.
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