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Ozonation of complex industrial park wastewater: effects on the change of wastewater characteristics
Author(s) -
Fanchiang JenMao,
Tseng DyiHwa,
Guo GiaLuen,
Chen HsiJien
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.2124
Subject(s) - biodegradation , chemical oxygen demand , fractionation , fraction (chemistry) , wastewater , chemistry , biochemical oxygen demand , industrial wastewater treatment , inert , sewage treatment , environmental chemistry , dissolved organic carbon , pulp and paper industry , chromatography , organic chemistry , environmental engineering , environmental science , engineering
BACKGROUND: Ozonation of complex industrial park wastewater was carried out in a semi‐batch reactor. The variation of wastewater characteristics was evaluated based on the analysis of 5‐day biochemical oxygen demand (BOD 5 ) concentration, BOD 5 /chemical oxygen demand (COD) ratio, COD fractionation, and dissolved organic carbon (DOC) molecular size distribution before and after ozonation. RESULTS: The experimental results indicated that low efficiency of COD removal with increasing tendency of BOD 5 concentration generally appeared after ozonation. Also, the BOD 5 /COD ratio increased from an initial of 0.27 to a maximum of 0.38. The COD fractionation tests revealed that most of the inert soluble COD was transformed to biodegradable soluble COD at 30 min of reaction time. Additionally, the DOC molecular size distribution tests showed that the fraction larger than 500 kDa was significantly decreased and the fraction smaller than 2 kDa was increased when the reaction time was prolonged to 240 min. CONCLUSION: This study verified that partial oxidation of the complex industrial park wastewater by ozonation could enhance wastewater biodegradability. The biodegradability enhancement was primarily because the inert soluble COD fraction was converted to the biodegradable soluble COD and the high molecular weight fraction of DOC was shifted toward the low molecular weight fraction. Copyright © 2009 Society of Chemical Industry