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Colour and COD removal from textile effluent by coagulation and advanced oxidation processes
Author(s) -
Solmaz Seval Kutlu Akal,
Birgül Aşkın,
Üstün Gökhan Ekrem,
Yonar Taner
Publication year - 2006
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/j.1478-4408.2006.00016.x
Subject(s) - hydrogen peroxide , chemistry , effluent , chemical oxygen demand , ozone , wastewater , pulp and paper industry , oxidation process , textile , coagulation , advanced oxidation process , peroxide , nuclear chemistry , environmental engineering , catalysis , environmental science , organic chemistry , materials science , psychology , psychiatry , engineering , composite material
The aim of this study was to compare the performance of coagulation, Fenton's oxidation (Fe 2+ /H 2 O 2 ) and ozonation for the removal of chemical oxygen demand (COD) and colour from biologically pretreated textile wastewater. FeSO 4 and FeCl 3 were used as coagulants at varying doses and varying colour removal efficiency was measured. For the Fenton process, COD and colour removal efficiencies were found to be 78% and 95% for the Fenton process, and to be 64% and 71% for the Fenton‐like process (Fe 3+ /H 2 O 2 ), respectively. Ozonation experiments were conducted at different initial pH values and fixed ozone doses. Ozonation resulted in 43% COD and 97% colour removal whereas these rates increased to 54% and 99% when 5 mg/l hydrogen peroxide was added to the wastewater before ozonation at the same dose. The operating costs of all proposed treatment systems were also evaluated in this study.