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- W2358106324 abstract "A washing technology was applied to treat the sediment contaminatedby Cd and Pb in Shenyang Zhangshi irrigation area (Cd 39 mg·kg-1, Pb 1 250 mg·kg-1) using a solution containing 0.5 mol·L-1 CaCl2 and 0.1mol·L-1 HCl. The optimized prescription was obtained through systemic washing experiments in this study. Several related factors were optimized in the experiment, including reaction temperature, washing time and shaking rate in our laboratory. The results indicated that the suitable ratio of liquid and solid was 3∶1, the removal rates of Cd and Pb in the contaminated sediment were 70.8%and 29.3%,under the condition of pH=1.0, reaction time with 30 min, shaking rate at 500 r·min-1 and temperature at 25℃, respectively. The sediment granularity analysis showed that the heavy metals of Cd and Pb mainly existed in fine particles,therefore, classification pretreatment may reduce the treating load and decreased the cost greatly. In addition, the heavy metal contents in the leaching liquor were detected and a method of lime treatment was carried out to purify the leaching liquor to be regenerated easily. Meanwhile, the heavy metal contents, 0.1 mg·kg-1 of Cd and 0.51 mg·kg-1 of Pb, respectively, in the washed sediment were found to be in accordance with the standard of waste solid lixiviating liquid. The results indicated that the concentrations of Pb and Cd in the washed sediment were in allowable range. The main washing mechanism of CaCl2 and HCl solution might be the complex function of Cl-ion under 0.1 mol·L-1 H+ionconcentration, which was testified by the experiments through adding extra NaCland Ca(NO3)2, respectively. As a conclusion, this kind of washing technology may be practiced in situ remediation of heavy metal contaminated sediment." @default.
- W2358106324 created "2016-06-24" @default.
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- W2358106324 date "2005-01-01" @default.
- W2358106324 modified "2023-09-24" @default.
- W2358106324 title "Remediation of Sediment Contaminated by Cd and Pb in Zhangshi Irrigation AreaUsing a Washing Technology" @default.
- W2358106324 hasPublicationYear "2005" @default.
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