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Study of the cytotoxicity of reactive dyeing effluent treated by F enton oxidation
Author(s) -
Chui ChungHin,
Man KunWai,
Tsang WaiFung,
Lam PikLing,
Leung Kelvin SzeYin,
Wong WaiYeung,
Kan ChiWai,
Lam KimHung
Publication year - 2013
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/cote.12055
Subject(s) - chemistry , hydrogen peroxide , cytotoxicity , effluent , reactive dye , sodium sulfite , nuclear chemistry , wastewater , dyeing , reactive oxygen species , reagent , sulfite , sodium , waste management , inorganic chemistry , organic chemistry , biochemistry , engineering , in vitro
Fenton oxidative wastewater treatment of CI R eactive B lack 5 and CI R eactive B lue 19 effluent was performed after a simulated laboratory‐scale dyeing process, and the cytotoxicity of the treated effluent was evaluated using human skin cell lines. Among the components for F enton oxidation, the human skin cell results showed that iron(II)sulfate at 150 m m did not show any significant cytotoxic effect, while other components, such as Glauber's salt solution (20 g l −1 ; 14%), CI R eactive B lack 5 (30 mg l −1 ; 24%), caustic soda (5 g l −1 ; 30%), CI Reactive Blue 19 (30 mg l −1 ; 32%), hydrogen peroxide (0.01 m ) and soda ash (5 g l −1 ) showed cytotoxic potential; the reagent sodium sulfite (30 m m ; 48%) exhibited the strongest cytotoxicity level. Fast decolorisation (>95%) was achieved within 10 min for CI R eactive B lack 5, while for CI R eactive B lue 19 it took longer (1.5 h) to achieve the same decolorisation. Studies showed that decolorisation for both dyes followed second‐order kinetics. In spite of the remarkable efficacy of the F enton oxidation process in removing colour within a short period of time, the resulting treated wastewater (within a reaction time of 1.5 h) also showed cytotoxicity towards the human HaCaT skin keratinocyte cell line. This observation can be explained by the strong oxidant and intermediate species produced during the advanced oxidation process, and a treatment step using sodium sulfite and a prolonged residence time can help to reduce the cytotoxicity.