Comparison of different activated carbon fibers for natural organic matter removal from lake water

초록

The removal characteristics of natural organic matter (NOM) from lake water using carbon fiber (CF), activated carbon fiber (ACF), ACF impregnation with copper (ACF-Cu) and ACF impregnation with silver (ACF-Ag) were investigated by using kinetic and isotherm models. The characteristics of raw and treated water were studied by fluorescence excitation emission matrix and liquid chromatography-organic carbon detection. Various fractions of NOM including dissolved organic carbon (DOC), hydrophobic organic carbon (HOC), chromatographic dissolved organic carbon (CDOC), biopolymers, humic substances (HS), building blocks (BB) and low molecular weight (LMW) neutrals were explored. Results showed that ACF is the best adsorbent followed by ACF-Ag for the removal of NOM at optimum dosage of 2.5 g/L for 12 h while ACF-Cu was found comparatively better than CF. Fractional studies indicated 41% of DOC was removed by using both ACF and ACF-Ag while 27% in case of ACF-Cu and only 9% by CF adsorbent. HOC elimination was highest by ACF up to 59% followed by 51% by ACF-Ag while ACF-Cu showed 34% elimination. CDOC removal was 39%, 42%, 25%, and 11% for ACF, ACF-Ag, ACF-Cu and CF adsorbents, respectively. ACF-Ag, ACF and ACF-Cu presented removal of HS as 33%, 35%, and 25%, respectively, on the other hand CF showed 11% retention of HS. Adsorption of biopolymers was 28%, 26%, and 21% by ACF-Ag, ACF and CF, respectively, while 15% by ACF-Cu. Moreover, ACF-Ag was found as the best adsorbent for BB removal as 63% followed by ACF with 60% while 44% retention was achieved by ACF-Cu and a similar trend of LMW neutrals removal was noted.

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