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IJSTR >> Volume 7 - Issue 6, June 2018 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Sedimentation Tests Of Small Scale Gold Mining Wastewater

[Full Text]



Jessie O. Samaniego, Maria Antonia N. Tanchuling



SSGM, heavy metals, TSS, sedimentation, column settling test.



Wastewater from small scale gold mining (SSGM) milling facility contains high amount of suspended solids and elevated concentration of Hg and other heavy metals. Most of these milling facilities have inadequately designed sedimentation tanks as its only treatment method, thus releasing wastewater to the receiving water bodies with heavy metals and suspended solids. In this study, sedimentation tests were conducted to investigate the removal of suspended solids and heavy metals (As, Hg, Pb) from actual small scale gold mining (SSGM) wastewater gathered from SSGM area in Paracale, Camarines Norte using settling column. A glass column with a diameter of 7.5 cm and a height of 120 cm was used to determine the removal rate of total suspended solids at settling time up to 720 mins. After 600 min of sedimentation, 100% removal of TSS was achieved. Heavy metal removal in the wastewater were tested at 100 cm from the bottom and results showed that after 480 min, removal efficiencies of 98.69%, 93.60% and 93.70% for As, Hg and Pb, respectively were achieved. The sediments collected from the settling column were analyzed for heavy metal concentrations and particle size distribution by atomic absorption spectrophotometer (AAS) and hydrometer, respectively. The X-ray diffraction (XRD) analysis result of the sediments indicates that the major component is silica.



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