| Summary: | 碩士 === 國立成功大學 === 環境工程研究所 === 81 === The experimental results showed that electrolyt- ical foam-
separation process could separate the heavy metal-chelate
complexes efficiently . The heavy metal removal by using
diethyl dithiocarbam- ate was better than ethyl xanthate. In
the case of Cu-EDTA-diethyl dithiocarbamate,the removal effic-
iency of Cu after 90 minutes operating time was over 98%
at S/M=2,4 and Cu(Ni)-citrate-diethyl dithiocarbamate,the
removal efficiency for both Cu and Ni were 98%at S/M=2.Besides,
the foamate volume decreased with the increase of S/M ratio.
In the case of Cu-citrate-ethyl xanthate , the foamate
volume at S/M=1,2,4 was 56.9,33.3,22.6ml,the ratio of heavy
metal in foamate (C) to initial solution (C)(ie.C/C) was
2.6,3.2,4.0,respectively. Throuth the orthogonal arrays L
experimental design and analysis of variance(ANOVA) of observed
data, it showed that surfactant type and NaDS con- centration
were statistically inferred to have significant effects on
the removal and concentrate d concentration of heavy metal.
Besides,surfactant type, S/M ratio and pH value were
stastistically inferred to have significant effects on the
foam- ate volume . The results showed that the higher
concentration of heavy metal was concentrated, the better
removal efficiency of heavy metal was achieved.
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