| Title |
A Study for Toxic Heavy Metal and Cyanides Treatment |
| Authors |
이찬기 ; 류재근 ( Chan Ki Lee ; Jae Keun Ryu ) |
| Abstract |
In recent year there has been considerable concern about waste discharges of chromium and cyanides to aquatic ecosystems. Chromium occurs in aqueous systems as both Cr (III) and Cr (VI). the Cr (VI) is of particular concern because this form has been demonstrated to be a public health hazard. The toxicity of cyanides to fish has long been recognized. Compounds containing the cyanides radical are frequently present in effluents of many industries, including electroplating plants, steel mills, petroleum refineries and gas works. The objective of this study is to remove the chromium and cyanides in the wastewater efficiently. In the experiment the amount of NaHSO₃ used for treatment were 2,4,6,10 and 20 ㎖ and the concentration of chromium was 100, 200, 300, 500 and 1000 ㎎/ℓwastewater. At that time efficiency was 99.1%-99.9% and the efficiency of pH 1.5 was better than pH 1, pH 2 and pH 3. The results of cyanides treatment was that concentration of residual CN^- ion was below 0.003 ㎎/ℓ, treated efficiency was 99.9%-99.98%, and in case of pH 9 was better than pH 11. |