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Multistage treatment of high strength dye wastewater by coagulation and ozonation
Author(s) -
Hsu YungChien,
Yen ChaoHsi,
Huang HsingChao
Publication year - 1998
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199801)71:1<71::aid-jctb808>3.0.co;2-k
Subject(s) - coagulation , chemistry , chloride , pulp and paper industry , wastewater , ozone , chromatography , nuclear chemistry , environmental engineering , organic chemistry , environmental science , psychology , psychiatry , engineering
Two types of wastewaters from the dye manufacturing process were treated by multistage chemical coagulation combined with ozonation. By using the coagulant iron(II) chloride and a commercial coagulant aid, the majority of COD was removed in advance of ozonation, a similar repeated treatment cycle was performed after settlement of the coagulant in each cycle. Results showed that the optimum concentrations to be used were 2·5% (v/v) iron(II) chloride and 35 mg dm −3 coagulant aid. The decolorization efficiency was >99% and the COD elimination was >90%. The multistage combined chemical coagulation ozonation treatment was found to be superior to the single‐stage treatment. © 1998 SCI.