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Pilot‐scale treatment of waste‐water from carbon production by a combined physical–chemical process
Author(s) -
Wang Hongjie,
Liu Ruiping,
Qu Jiuhui,
Fan Maohong,
Li Huaizheng
Publication year - 2009
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/jctb.2119
Subject(s) - chemical oxygen demand , effluent , dissolved organic carbon , coagulation , chemistry , lime , precipitation , total suspended solids , ferrous , carbon fibers , total dissolved solids , water treatment , total organic carbon , pulp and paper industry , wastewater , suspended solids , polyacrylamide , environmental chemistry , environmental science , environmental engineering , metallurgy , materials science , psychology , physics , organic chemistry , psychiatry , meteorology , composite number , polymer chemistry , engineering , composite material
BACKGROUND: Due to its strong colour, high concentrations of fluorides and chemical oxygen demand (COD Cr ) and large amount of suspended solids (SS), the waste‐water from carbon production (WCP) seriously affects the stability of the circulating system of Guizhou Branch, Aluminium Corporation of China. In this paper, the performance of a pilot‐scale (24 m 3 d −1 ) combined treatment plant, consisting of chemical precipitation, coagulation, and Fenton oxidation, for the treatment of WCP was investigated. RESULTS: Lime precipitation and hydrated ferrous sulphate (HFS) coagulation, with polyacrylamide (PAM) as a coagulation aid, proved to be effective in the removal of colour (>70%), suspended solids (SS) (>90%) and fluoride (>80%) from the WCP. Subsequent Fenton oxidation combined with coagulation as a final treatment efficiently removed SS, F − , COD Cr , dissolved organic carbon (DOC) and colour. The average total removal efficiencies of these parameters in the pilot‐scale combined technology were as follows: SS = 98.8%, F − = 95.7%, COD Cr = 94.8%, DOC = 91.8% and colour = 98.3%, giving an average effluent quality: colour 24 (multiple), COD Cr 168 mg L −1 , DOC 80 mg L −1 , F − 38 mg L −1 and SS 44 mg L −1 , consistent with the reusable water limits for the process. CONCLUSIONS: The current experimental results and the economic evaluation suggest that the combined process could be advantageous and feasible for the treatment of WCP. Copyright © 2009 Society of Chemical Industry