Page 112 - Materials Chemistry, Second Edition

Life Cycle Assessment of Wastewater Treatment

6 Textile Wastewater Textile Wastewater Treatment by Advanced Oxidation Processes

Treatment by Advanced

Oxidation Processes

A Comparative Study

Maria Gamallo, Yolanda Moldes-Diz,

Roberto Taboada-Puig, Juan Manuel Lema,
Gumersindo Feijoo, and Maria Teresa Moreira

CONTENTS

6.1 Introduction ....................................................................................................94
6.1.1 The Environmental, Health, and Economic Impacts of Textile Effluents ....94
6.1.2 Chemical Classification of Colorants .................................................95
6.1.2.1 Azo Dyes and Pigments .......................................................95
6.1.2.2 Carbonyl Dyes and Pigments ...............................................95
6.1.2.3 Phthalocyanines ...................................................................96
6.1.2.4 Polyene and Polymethine Dyes ............................................96
6.1.2.5 Aryl Carbonium Ion Dyes ...................................................96
6.1.2.6 Sulfur Dyes ..........................................................................96
6.1.2.7 Nitro Dyes ............................................................................97
6.1.3 Textile Dyes ........................................................................................97
6.2 Advanced Oxidation Processes (AOPS) for Treatment of Industrial
Textile Effluents .............................................................................................99
6.2.1 Ozonation ............................................................................................99
6.2.2 H O /UV ...........................................................................................100
2
2
6.2.3 Fenton (H O /Fe ) and Photo-Fenton Processes .............................100
2+
2
2
6.2.4 Photocatalysis ................................................................................... 101
6.2.5 Sonolysis ........................................................................................... 101
6.3 Process Intensification using Nanostructured Materials for Dye Removal ...... 102
6.3.1 Photochemical Process Based on TiO Nanoparticles ..................... 103
2
6.3.2 Heterogeneous Fenton Catalytic Degradation Based on
Magnetite Nanoparticles ...................................................................107
6.3.3 Nanobiocatalysts Based on Silica-Coated, Oleic Acid–Coated,
and Polyethylenimine-Coated Magnetic Nanoparticles and
Their Use in Dye Decolorization ......................................................108
6.4 Conclusions ................................................................................................... 111
Acknowledgements ................................................................................................ 111
References .............................................................................................................. 111

93