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An optimization and modeling approach for H 2 O 2 /UV‐C oxidation of a commercial non‐ionic textile surfactant using central composite design
Author(s) -
ArslanAlaton Idil,
Akin Asli,
OlmezHanci Tugba
Publication year - 2010
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.2315
Subject(s) - central composite design , pulmonary surfactant , aqueous solution , response surface methodology , chemistry , chemical oxygen demand , composite number , chemical engineering , materials science , chromatography , organic chemistry , environmental engineering , composite material , environmental science , wastewater , biochemistry , engineering
Abstract BACKGROUND: Industrial surfactants are biologically complex organics that are difficult to degrade and may cause ecotoxicological risks in the environment. Until now, many scientific reports have been devoted to the effective treatment of surfactants employing advanced oxidation processes, but there is no available experimental study dealing with the optimization and statistical design of surfactant oxidation with the well‐established H 2 O 2 /UV‐C process. RESULTS: Considering the major factors influencing H 2 O 2 /UV‐C performance as well as their interactions, the reaction conditions required for the complete oxidation of a commercial non‐ionic textile surfactant, an alkyl ethoxylate, were modeled and optimized using central composite design‐response surface methodology (CCD‐RSM). Experimental results revealed that for an aqueous non‐ionic surfactant solution at an initial chemical oxygen demand (COD) of 450 mg L −1 , the most appropriate H 2 O 2 /UV‐C treatment conditions to achieve full mineralization at an initial pH of 10.5 were 47 mmol L −1 H 2 O 2 and a reaction time of 86 min (corresponding to a UV dose of 30 kWh m −3 ). CONCLUSION: CCD allowed the development of empirical polynomial equations (quadratic models) that successfully predicted COD and TOC removal efficiencies under all experimental conditions employed in the present work. The process variable treatment time, followed by the initial COD content of the aqueous surfactant solution were found to be the main parameters affecting treatment performance, whereas the initial H 2 O 2 concentration had the least influence on advanced oxidation efficiencies. The H 2 O 2 concentration and surfactant COD were found to be more important for TOC abatement compared with COD abatement. Copyright © 2009 Society of Chemical Industry