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KMID : 0896219920130011263
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Journal of Daegu Health College
1992 Volume.13 No. 1 p.1263 ~ p.1270
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A study on the treatment of micro amount of chromium(Ⅳ) in waste water by Coprecipitation
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Lee Jing-Yeon
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Abstract
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This study is to investigate the removal efficiency of Cr^(+6) from waste water by using the coprecipitation phenomena.
Experiments were performed mainly by using the jar tester at pH range of 8 to 11. Cr^(+6) concentration was 1㎎/ℓ with different concentrations of ammonium ferrous sulfate, which were 5 to 100㎎/ℓ as Fe^(+2). Following conclusion were obtained from the results of this study. Removal efficiency was highly improved compared to the conventional hydroxide precipitation treatment. The optimum conditions for Cr^(+6) removal is at pH range of 9 to 10 and over the ratio(㎎/ℓ Fe^(+2)㎎/ℓCr^(+6)) of 5. The added So₄^(-2) at pH range of 5 to 6 improved on the coprecipitation of Cr^(+6). The added Ca^(+2) at pH range 10 to 11 improved on the coprecipitation of Cr^(+6).
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KEYWORD
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