In this study, we investigated the adsorption of As, Cd and Cu using precipitates in acid mine water from Dalsung mine that abandoned metal mine. Water samples were collected from streams flowing from the study area. The pH and electrical conductivity (EC) were measured at each sampling site. The sulfate and other heavy metal concentration were determined with ion chromatograph (IC) and inductively coupled plasma emission spectrometry (ICP-AES), respectively. Precipitates samples that for using heavy metal adsorption experiments were collected from stream bottom and precipitated from acid mine water in laboratory. The mineralogy of precipitates was examined using X-ray diffraction analysis. The pH value of acid mine drainage collected from Dalsung mine in April and August ranges from 3.30 to 4.72 and 3.03 to 4.40, respectively. EC varies from 817 to 2400 μS/cm and the SO<sub>4</sub> content varies from 1010.03 to 1953.29 mg/L. The sediments that precipitated in stream bottom flow acid mine water consist mainly of poorly crystallized schwertmannite and low crystalline goethite. Three heavy metals, As, Cd and Cu, were used to conduct the relevant adsorption experiments with the fixed concentrations of<i> </i>1mg/L and 10 mg/L, respectively. Initial concentrations of As (1.01 mg/L), Cd (1.41 mg/L) and Cu (1.17 mg/L) changed to 0.17 mg/L, 1.03 mg/L in sediments from stream bottom and 0.02 mg/L, 0.01 mg/L and 0.01 mg/L in precipitates in laboratory pH value of 12, respectively. The precipitates that collected from stream bottom flow acid mine water resulted in heavy metal adsorption rate blow average 80 percent. The sediments that precipitated from laboratory in the pH value 12 resulted in As, Cd and Cu adsorption rate over average 90 percent. This study indicates that precipitates from acid mine water in laboratory are more efficient in the adsorption of As, Cd and Cu than sediments from stream bottom in acid mine drainage.

Characterization of heavy metal adsorption using precipitates in acid mine water from abandoned metal mine

253rd National Meeting (2017)

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