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Over the last few years there has been a growing concern over the increasing concentration of micropollutants originating from a great variety of sources including pharmaceutical, chemical engineering and personal care product industries in rivers, lakes, soil and groundwater. As most of the micropollutants are polar and persistent compounds, they are only partially or not at all removed from wastewater and thus can enter the environment posing a great risk to the biota. It is hypothesized that wastewater is one of the most important point sources for micropollutants.
This book gives a comprehensive overview of modern analytical methods and will summarize novel single and hybrid methods to remove continuously emerging contaminants - micropollutants from the aqueous phase. New trends (e.g. sensor technology, nanotechnology and hybrid treatment technologies) will be described in detail. The book is very timely because the new techniques are still in the development phase and have to be realized not only in the laboratory but also on a larger scale. The content of the book is divided into chapters that present current descriptive and analytical methods that are available to detect and measure micropollutants together with detailed information on various chemical, biological and physicochemical methods that have evolved over the last few decades.
Treatment of Micropollutants in Water and Wastewater also enables readers to make well informed choices through providing an understanding of why and how micropollutants must be removed from water sources, and what are the most appropriate and available techniques for providing a cost and Treatment of Micropollutants technologically effective and sustainable solutions for reaching the goal of Editors: Jurate Virkutyte, Rajender S. Varma micropollutant-free water and wastewater. in Water and Wastewater and Veeriah Jegatheesan The book is suitable for water and wastewater professionals as well for students and researchers in civil engineering, environmental engineering and Editors: Jurate Virkutyte, Rajender S. Varma and Veeriah Jegatheesan process engineering fields.
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ISBN 13: 9781843393160 ISBN: 1843393166
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Treatment of Micropollutants in Water and Wastewater
Editors Jurate Virkutyte (University of Eastern Finland, Finland), Rajender S. Varma (USEPA, Cincinnati, OH, USA), Veeriah Jegatheesan (James Cook University, Australia)
Downloaded from https://iwaponline.com/ebooks/book-pdf/521270/wio9781780401447.pdf by IWA Publishing user on 04 February 2019 Integrated Environmental Technology Series The Integrated Environmental Technology Series addresses key themes and issues in the field of environmental technology from a multidisciplinary and integrated perspective. An integrated approach is potentially the most viable solution to the major pollution issues that face the globe in the 21st century. World experts are brought together to contribute to each volume, presenting a comprehensive blend of fundamental principles and applied technologies for each topic. Current practices and the state-of-the-art are reviewed, new developments in analytics, science and biotechnology are presented and, crucially, the theme of each volume is presented in relation to adjacent scientific, social and economic fields to provide solutions from a truly integrated perspective. The Integrated Environmental Technology Series will form an invalu- able and definitive resource in this rapidly evolving discipline. Series Editor Dr Ir Piet Lens, Sub-department of Environmental Technology, IHE-UNESCO, P.O. Box 3015, 2601 DA Delft, The Netherlands ([email protected]). Published titles Biofilms in Medicine, Industry and Environmental Biotechnology: Characteristics, analysis and control Decentralised Sanitation and Reuse: Concepts, systems and implementation Environmental Technologies to Treat Sulfur Pollution: Principles and engineering Phosphorus in Environmental Technology: Principles and applications Soil and Sediment Remediation: Mechanisms, techniques and applications Water Recycling and Resource Recovery in Industries: Analysis, technologies and implementation Environmental Technologies to treat Nitrogen Pollution Bioelectrochemical Systems: From extracellular electron transfer to biotechnological application Treatment of Micropollutants in Water and Wastewater
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ISBN 10: 1843393166 ISBN 13: 9781843393160
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Preface...... xv
1 MICROPOLLUTANTS AND AQUATIC ENVIRONMENT...... 1 1.1 Introduction...... 1 1.2 Pesticides ...... 2 1.2.1 Organochlorine insecticides ...... 3 1.2.1.1 Fate ...... 4 1.2.1.2 Effects ...... 5 1.2.2 Organophosporous insecticides ...... 6 1.2.2.1 Fate ...... 7 1.2.2.2 Effects ...... 8 1.2.3 Triazine herbicides ...... 8 1.2.3.1 Fate ...... 9 1.2.3.2 Effects ...... 10 1.2.4 Substituted ureas...... 10
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1.2.4.1 Fate ...... 11 1.2.4.2 Effects ...... 11 1.2.5 Legislation ...... 12 1.3 Pharmaceuticals ...... 13 1.3.1 Fate...... 15 1.3.2 Effects ...... 19 1.3.3 Legislation ...... 20 1.4 Steroid Hormones...... 21 1.4.1 Fate...... 22 1.4.2 Effects ...... 24 1.4.3 Legislation ...... 25 1.5 Surfactants and Personal Care Products...... 25 1.5.1 Fate...... 27 1.5.2 Effects ...... 29 1.5.3 Legislation ...... 30 1.6 Perfluorinated Compounds ...... 30 1.6.1 Fate...... 31 1.6.2 Effects ...... 32 1.6.3 Legislation ...... 33 1.7 References...... 35
2 ANALYTICAL METHODS FOR THE IDENTIFICATION OF MICROPOLLUTANTS AND THEIR TRANSFORMATION PRODUCTS...... 53 2.1 Introduction...... 53 2.2 Theoretical Approaches to the Analytics of Micropollutants...... 60 2.2.1 Computational methods to evaluate the degradation of micropollutants ...... 60 2.2.1.1 Frontier electron density analysis (Frontier orbital theory)...... 61 2.2.2 Chemometrics in analysis ...... 63 2.2.2.1 Parafac ...... 64 2.2.2.2 MCR ...... 64 2.2.2.3 BLLS...... 65 2.2.2.4 U-PLS ...... 65 2.2.2.5 ANN...... 66 2.3 Instrumental Methods...... 66 2.3.1 Sample preparation...... 67 2.3.1.1 Sample extraction...... 67
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2.3.1.2 Chromatographic separation ...... 69 2.3.1.3 Capillary electrophoresis (CE)...... 69 2.3.2 Detection of micropollutants transformation products...... 71 2.3.2.1 Mass spectrometry...... 72 2.3.3 UV-Visible spectroscopy...... 76 2.3.4 NMR spectroscopy ...... 76 2.3.5 Biological assessment of the degradation products ...... 78 2.3.5.1 Ecotoxicological assessment of environmental risk (toxicity) ...... 79 2.3.5.2 Assessment of estrogenic activity...... 80 2.3.5.3 Assessment of antimicrobial activity...... 81 2.3.5.4 Biosensors...... 81 2.4 Identification Levels of Micropollutants Transformation Products...... 82 2.5 Conclusions...... 85 2.6 References...... 85
3 SENSORS AND BIOSENSORS FOR ENDOCRINE DISRUPTING CHEMICALS: STATE-OF-THE-ART AND FUTURE TRENDS...... 93 3.1 Introduction...... 93 3.2 Sensors and Biosensors ...... 94 3.2.1 The need for alternative methods ...... 94 3.2.2 Electrochemical sensors ...... 95 3.2.3 Biosensors...... 96 3.2.4 New generation immunosensors ...... 100 3.3 Trends in Sensors and Biosensors ...... 106 3.3.1 Screen printed sensors and biosensors ...... 106 3.3.2 Nanotechnology applications ...... 106 3.3.3 Molecular imprinted polymer sensors ...... 108 3.3.4 Conducting polymers...... 112 3.4 Future of Sensing ...... 114 3.5 References...... 115
4 NANOFILTRATION MEMBRANES AND NANOFILTERS...... 129 4.1 Introduction of Nanofiltration ...... 129 4.2 Nanofiltration Membrane Materials...... 132 4.3 Separation and Fouling of Nanofiltration...... 136
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4.4 Nanofiltration of Micropollutants in Water...... 142 4.5 References...... 152
5 PHYSICO-CHEMICAL TREATMENT OF MICROPOLLUTANTS: ADSORPTION AND ION EXCHANGE ...... 165 5.1 Introduction...... 165 5.2 The Main Stages of Adsorption & Ion Exchange Science Development...... 167 5.3 Carbons in Water Treatment and Medicine ...... 169 5.4 Zeolites (Clays) ...... 172 5.5 Ion Exchange Resins or Ion Exchange Polymers ...... 173 5.6 Inorganic Ion-Exchangers ...... 176 5.6.1 Ferrocyanides adsorbents ...... 177 5.6.2 Synthesis of inorganic ion exchangers ...... 184 5.7 Biosorbents (Biomasses): Agricultural and Industrial By-Products, Microorganisms ...... 187 5.8 Hybrid and Composite Adsorbents and Ion Exchangers...... 191 5.9 Comments on the Theory and Future of Adsorption and Ion-Exchange Science ...... 192 5.10 Acknowledgement ...... 194 5.11 References...... 194
6 PHYSICO-CHEMICAL TREATMENT OF MICROPOLLUTANTS: COAGULATION AND MEMBRANE PROCESSES...... 205 6.1 Coagulation...... 205 6.1.1 Enhanced coagulation...... 206 a) Effects of physical-chemical properties of micropollutants .... 208 b) Choice of coagulants and dosage ...... 210 c) pH and alkalinity...... 211 6.1.2 Coagulation-oxidation ...... 213 6.2 Membrane Processes ...... 215 6.2.1 Mechanisms of solute rejection during membrane treatment...... 216 6.2.2 Micropollutant removal by microfiltration ...... 217 6.2.3 Micropollutant removal by ultrafiltration ...... 218 a) Ultrafiltration alone ...... 218 b) Combination of ultrafiltration and powdered activated carbon ...... 219
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c) Combination of ultrafiltration and biological module (membrane bioreactor) ...... 220 6.2.4 Micropollutant removal by reverse osmosis ...... 225 6.2.5 Electrodialysis...... 227 6.3 References...... 233
7 BIOLOGICAL TREATMENT OF MICROPOLLUTANTS... 239 7.1 Introduction...... 239 7.2 Municipal Sewage as the Source of Micropollutants ...... 240 7.2.1 Urine source separation and possible advantages ...... 243 7.2.2 Biological degradation in source separated urine ...... 247 7.3 Biological Treatment of Micropollutants ...... 249 7.3.1 Analysis of Micropollutants...... 250 7.3.1.1 Analytical techniques used for wastewater and sludge samples...... 251 7.3.1.2 Endocrine disrupting effect...... 252 7.3.2 Removal mechanisms of Micropollutants ...... 254 7.3.2.1 Sorption...... 254 7.3.2.2 Abiotic degradation and volatilization ...... 257 7.3.2.3 Biodegradation...... 258 7.3.3 Factors affecting the biological removal efficiency ...... 259 7.3.3.1 Compound structure ...... 259 7.3.3.2 Bioavailability ...... 261 7.3.3.3 Dissolved oxygen and pH...... 261 7.3.3.4 Hydraulic and sludge retention time ...... 263 7.3.3.5 Organic load rate...... 266 7.3.3.6 Temperature...... 266 7.3.4 Biological treatment of Micropollutants in different processes ...... 268 7.3.4.1 Activated sludge systems...... 268 7.3.4.2 Wetlands ...... 272 7.3.4.3 Membrane bioreactors...... 274 7.3.4.4 Anaerobic treatment ...... 275 7.3.4.5 Other bioreactors ...... 277 7.3.5 Biological treatment of Micropollutants in sludge ...... 278 7.3.6 Specific microorganisms/cultures used for biodegradation of Micropollutants ...... 278 7.3.7 Formation of by-products during biodegradation ...... 280 7.4 References...... 281
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8 UV IRRADIATION FOR MICROPOLLUTANT REMOVAL FROM AQUEOUS SOLUTIONS IN THE PRESENCE OF H2O2...... 295 8.1 Introduction...... 295 8.2 Theory of UV/H2O2 ...... 296 8.2.1 General...... 296 8.2.2 Photolysis...... 298 8.2.3 Mechanisms UV/H2O2 oxidation...... 299 8.2.4 Ozone/UV ...... 300 8.3 Laboratory Scale Experiments of UV/H2O2 ...... 300 8.3.1 General...... 300 8.3.2 Treatment of contaminated groundwater...... 300 8.3.3 Drinking water applications ...... 303 8.3.4 Municipal waste water ...... 305 8.3.5 Paper and pulp industry ...... 307 8.4 Other UV Based Techniques ...... 307 8.5 Alternative Radiation Sources ...... 309 8.6 Practical Issues of UV/H2O2 Treatment...... 310 8.7 Cost Estimation & Performance ...... 313 8.8 References...... 316
9 HYBRID ADVANCED OXIDATION TECHNIQUES BASED ON CAVITATION FOR MICROPOLLUTANTS DEGRADATION ...... 321 9.1 Introduction...... 321 9.2 Theory of Ultrasound ...... 322 9.2.1 Cavitation phenomena...... 322 9.2.2 The general hypothesis in sonochemical processing ...... 322 9.2.3 Cavitation effects...... 323 9.2.4 Factors affecting the efficiency of sonochemical degradation...... 325 9.2.4.1 Ultrasonic frequency ...... 325 9.2.4.2 Input electrical power ...... 326 9.2.4.3 Nature of the compound and the reaction pH ...... 326 9.2.4.4 The reaction temperature ...... 327 9.2.4.5 The presence of additives ...... 327 9.2.4.6 Ultrasonic equipment ...... 329 9.3 Hybrid Cavitation-Based Technologies...... 330
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9.3.1 US/oxidant ...... 330 9.3.1.1 US/H2O2 ...... 330 9.3.1.2 US/O3...... 331 9.3.2 US/UV...... 333 9.3.3 US/A ...... 333 9.3.4 US/EO...... 334 9.3.5 US/MW...... 335 9.4 Degradation of Micropollutants ...... 336 9.4.1 Degradation of pharmaceuticals by hybrid techniques based on cavitation ...... 336 9.4.2 Degradation of organic dyes by hybrid techniques based on cavitation...... 340 9.4.3 Degradation of pesticides by hybrid techniques based on cavitation...... 343 9.5 Scale-Up Considerations ...... 348 9.6 Economical Aspects of Cavitation Based Treatment...... 350 9.7 Conclusions...... 353 9.8 References...... 353
10 ADVANCED CATALYTIC OXIDATION OF EMERGING MICROPOLLUTANTS ...... 361 10.1 Introduction...... 361 10.2 Heterogeneous Catalysis ...... 362 10.2.1 Desirable properties of the catalyst ...... 363 10.3 Environmental Catalysis...... 364 10.4 Advanced Catalytic Oxidation Processes for the Removal of Emerging Contaminants from the Aqueous Phase...... 365 10.4.1 Catalytic wet peroxide oxidation processes (CWPO) ...... 365 10.4.1.1 Homogeneous Fenton process ...... 365 10.4.1.2 Heterogeneous Fenton process ...... 368 10.4.1.3 Heterogenized catalyst for the micropollutants removal ...... 369 10.4.2 Other metal catalysts in wet peroxide oxidation of micropollutants ...... 371 10.4.3 Catalytic ozonation of micropollutants ...... 373 10.4.4 Photocatalytic degradation of micropollutants ...... 375 10.4.4.1 Titanium dioxide catalyzed degradation of micropollutants ...... 377
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10.4.4.2 Photo-Fenton process for the degradation of micropollutants ...... 379 10.4.4.3 Other photocatalysts in the degradation of micropollutants ...... 381 10.4.5 Sonocatalytic degradation of micropollutants ...... 383 10.4.6 Microwave-assisted catalytic degradation of miropollutants ...... 388 10.4.7 Electrocatalytic oxidation ...... 390 10.4.7.1 Degradation of micropollutants with electrocatalytic and coupled electrocatalytic methods ...... 392 10.4.8 Biocatalytic oxidation of micropollutants ...... 395 10.4.9 Catalytic wet air oxidation of micropollutants ...... 397 10.5 Advanced Nanocatalytic Oxidation of Micropollutants...... 399 10.6 Conclusions...... 414 10.7 References...... 415
11 EXISTENCE, IMPACTS, TRANSPORT AND TREATMENTS OF HERBICIDES IN GREAT BARRIER REEF CATCHMENTS IN AUSTRALIA ...... 425 11.1 Introduction...... 425 11.2 Persistent Organic Pollutants (POPs) ...... 426 11.3 Herbicides and Pesticides...... 433 11.4 Great Barrier Reef (GBR)...... 438 11.4.1 Background ...... 438 11.4.2 Transport of herbicides and pesticides into the GBR ...... 439 11.5 Persistence of Herbicides and Pesticides in the GBR Catchments and Lagoon...... 442 11.6 Impact to the GBR Ecosystem due to the Persistence of Herbicides and Pesticides...... 445 11.7 Removal of Herbicides by Different Water Treatment Processes...... 447 11.8 Possible Methods of Treatment of POPs Including Herbicides and Pesticides from Catchment Discharges ...... 450 11.8.1 Biological processes ...... 450 11.8.2 Adsorption processes ...... 451 11.8.3 Wetland processes ...... 451 11.8.4 Pressure driven membrane filtration processes ...... 452 11.8.5 Hybrid systems ...... 453
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11.8.6 Hybrid systems – membrane bioreactors (MBR) ...... 454 11.8.7 Other Processes ...... 457 11.9 Conclusions...... 457 11.10 References...... 457
Index...... 465
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Micropollutants – compounds which are found in the mgL 1 or ng L 1 concentration range in water, soil and wastewater are considered to be potential threats to environmental ecosystems. Over the last few years there has been a growing concern of the scientific community due the increasing concentration of micropollutants originating from a great variety of sources including pharma- ceutical, chemical engineering and personal care product industries in rivers, lakes, soil and groundwater. Once released into the environment, micropollutants are subjected to different processes such as distribution between different phases, biological and abiotic degradation. These processes contribute to their elimination and affect their bioavailability. The role of the aforementioned processes in micropollutants’ fate depends on the physico-chemical properties of these compounds (polarity, water solubility, vapor pressure) and the type of the environment (natural or mechanical) where the micropollutants are present (groundwater, surface water, sediment, wastewater treatment systems, drinking-water facilities). As a result,
#2010 IWA Publishing. Treatment of Micropollutants in Water and Wastewater. Edited by Jurate Virkutyte, Veeriah Jegatheesan and Rajender S. Varma. ISBN: 9781843393160. Published by IWA Publishing, London, UK.
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different transformation reactions can produce metabolites that often differ in their environmental behavior and ecotoxicological profile from the parent compounds. The current concern of micropollutants in the receiving waters calls for new approaches in wastewater treatment. Unfortunately, conventional wastewater treatment plants are designed to deal with bulk substances that arrive regularly and in large quantities (primarily organic matter and the nutrients or nitrogen and phosphorus). On the contrary, micropollutants are entirely different due to their unique characteristics and behavior in the treatment plant. Thus, new measures must be taken into account to reduce or entirely eliminate these contaminants from water and wastewater. The 10 chapters of this book have been arranged in such a way that it forms the core of Micropollutants science area: their occurrence in aquatic systems, detection and analysis utilizing the newest trends in sensors and biosensors fields, biological, physical and chemical treatment methods exploiting sole and hybrid techniques as well as presenting a case study – effect of pesticides on the one of the most precious wonders of the natural world – Great Barrier Reef (Australia). Most chapters have designed to include (i) a theoretical background, (ii) a review on the actual knowledge and (iii) cutting-edge research results. Therefore this book will be suitable for water and wastewater professionals as well for students and researchers in civil engineering, environmental chemistry, environmental engineering and process engineering fields, especially to those who wish to pinpoint the actual frontiers of science in this specific domain. We wish to thank all authors for providing high quality manuscripts. We are indebted to Ms Maggie Smith, the Editor of IWA for having accepted our proposal to design this book. Moreover, Prof. Piet Lens, the Editor of Integrated Environmental Technology Series is greatly acknowledged for the valuable comments and recommendations regarding the layout and scientific presentation of the book.
Drs Jurate Virkutyte, Rajender S. Varma and Veeriah Jegatheesan. March, 2010.
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A. S. Stasinakis and G. Gatidou
1.1 INTRODUCTION Micropollutants are compounds which are found in the mgL 1 or ng L 1 concentration range in the aquatic environment and are considered to be potential threats to environmental ecosystems. Different groups of compounds are included in this category such as pesticides, PCBs, PAHs, flame retardants, perfluorinated compounds, pharmaceuticals, surfactants and personal care products. Recent studies have indicated the often detection of these compounds in the aquatic environment (Kolpin et al., 2002; Loos et al., 2009). The way that these compounds enter the environment depends on their uses and the mode of application. The major routes seem to be agricultural and urban runoff, municipal and industrial wastewater discharge, sludge disposal and accidental spills (Ashton et al., 2004; Becker et al., 2008; Mompelat et al., 2009).
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Once released into the environment, micropollutants are subjected to different processes such as distribution between different phases, biological and abiotic degradation (Halling-Sørensen et al., 1998; Hebberer, 2002a; Birkett and Lester, 2003; Farre et al., 2008). These processes contribute to their elimination and affect their bioavailability. The role of the aforementioned processes in micropollutants’ fate depends on the physico-chemical properties of these compounds (polarity, water solubility, vapor pressure) and the type of the environment (natural or mechanical) where the micropollutants are present (groundwater, surface water, sediment, wastewater treatment systems, drinking- water facilities). As a result, different transformation reactions can take place, producing metabolites that often differ in their environmental behavior and ecotoxicological profile from the parent compounds. So far, several effects of these compounds on aquatic organisms have been reported such as acute and chronic toxicity, endocrine disruption, bioaccumulation and biomagnifications (Oaks et al., 2004; Fent et al., 2006; Darbre and Harvey, 2008). In the next paragraphs, data for the occurrence, fate and effects of some micropollutants’ categories will be given. Pesticides have been selected due to their wide use and their well-defined toxicological effects and environmental fate. Five categories of emerging contaminants will be also presented (pharmaceuticals, steroid hormones, perfluorinated compounds, surfactants and personal care products) due to the great interest that has recently arisen for their occurrence in the environment.
1.2 PESTICIDES The word ‘‘pesticide’’ precisely is referred to an agent that is used to kill an unwanted organism (Rana, 2006). According to EPA (USEPA) pesticide is called an organic compound (or mixture of compounds) which acts against pests (insect, rodent, fungus, weed etc.) by several ways like prevention, destruction, repulse or mitigation. These biologically active chemicals are often called biocides and include several classes such as herbicides, insecticides and fungicides, depending on the type of the pests that they control. Before 1940, inorganic compounds and few natural agents originated from plants were used as pesticides (Rana, 2006). The great production of synthetic organic compounds for use in pest control was started with the discovery of DDT’s insecticidal activity in 1938 and it was continued during and following the Second World War (Matthews, 2006). During the next decades, an exponential increase in production and use of synthetic pesticides was observed worldwide (Rana, 2006). Today, many different classes of pesticides are used, including among others chlorinated hydrocarbons, organophosphoric compounds, substituted ureas and
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triazines. Despite the positive effects from the usage of synthetic pesticides on public health and global economy, the extensive use of these compounds resulted in serious environmental contamination problems worldwide and deleterious effects on humans and ecosystems. Risks associated with pesticides usage were firstly mentioned by Rachel Carson in her book Silent Spring.
1.2.1 Organochlorine insecticides Insecticides are one of the most significant types of pesticides due to the fact that they can be applied in a short time before harvesting and after crops collection (Manahan, 2004). Initially, insecticides were divided into two main groups: the organochlorines and organophosphates (Matthews, 2006). Both of these groups affect the nervous system of the organisms by inhibiting the enzyme called acetylcholinesterase (Walker et al., 2006). Organochlorine insecticides are halogenated solid organic compounds, highly lipophilic, with very low water solubility and high persistence. These properties result in remaining of residues in the environment for long time and further accumulation to several animals (Matthews, 2006; Walker et al., 2006). Among the different classes of organochlorine insecticides, dichlorodiphenylethanes, chlorinated cyclodienes (or chlordanes) and hexachlorocyclohexanes are of great concern due to their potential risk to human health and environmental fate (Qiu et al., 2009). The most known dichlorodiphenylethane pesticide is DDT (Figure 1.1). This compound was mainly used for vector control during the Second World War and thereafter was extensively used in agriculture (Walker et al., 2006).
H ClC Cl
Cl C Cl Cl Figure 1.1 The organochlorine insecticide DDT (p0p-dichlorodophenyltrichlor- oethane)
Chlorinated cyclodienes, such as aldrin, dieldrin or heptachlor (Figure 1.2), were introduced in 1950s and they were used both for crop protection against pests and certain vectors of disease (e.g., tsetse fly) (Walker et al., 2006). The organochloride insecticides belonging in the group of hexachlorocyclo- hexanes (HCH) were introduced in the market as a crude mixture of isomers (Walker et al., 2006). Between the five isomers of this mixture, only g isomer,
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commonly referred as g-HCH or lindane (Figure 1.3), found to be effective as insecticide (Manahan, 2004).
Cl Cl Cl Cl Cl Cl Cl
Cl Cl OClCl Cl Cl Cl Cl Cl Cl Cl Cl Aldrin Dieldrin Heptachlor Figure 1.2 The organochloride insecticides aldrin, dieldrin and heptachlor
Cl C1 H C1 H H H H C1 H C1 Cl Figure 1.3 The organochloride insecticide lindane (1,2,3,4,5,6-hexachlorocyclo- hexane)
1.2.1.1 Fate The widespread used organochlorine pesticides present ubiquitous persistence in different environmental media. For instance, a half-life ranging between 3 and 4 years has been estimated for dieldrin in soils, whereas a much higher half-life time (up to 15 years) has been calculated for DDT (UNEP, 2002). These half- lives indicate the the very slow elimination of compounds like DDT by most leaving organisms (IARC/WHO, 1991). These compounds can enter the aquatic environment in several ways such as run-off from non-point sources or discharge of industrial wastewater. Despite their low water solubility, several organochlorine pesticides are detected worldwide in water column (Table 1.1). It is entirely known that organochlorine pesticides present high affinity for lipid tissues. As a result, they can be bioaccumulated and biomagnified. According to Zhou et al. (2008), log bioconcentration factors (BCFs) of several organochlorine compounds vary from 2.88 to 6.28 for fish, from 3.78 to 6.17 for shrimp and from 3.13 to 5.42 for clams. Through the consumption of aquatic organisms, drinking water and agricultural crops, these compounds reach humans and are excreted to breast milk. Dahmardeh-Behrooz et al. (2009) reported mean concentration of total DDTs and HCHs equal to
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3563 and 5742 ng g 1 (lipid weight), respectively, in human milk in Iran. Besides their banning, these compounds are also detected in human milk in developed countries. Kalantzi et al. (2004) reported concentrations as high as 220 and 40 ng g 1 (lipid weight) for DDTs and HCHs, resprectively, in human milk from women in England. Moreover, Polder et al. (2003) detected even higher concentrations of DDTs (1200 ng g 1 lipid weight) and HCHs (320 ng g 1 lipid weight) after analyzing human milk in Russia. Table 1.1 Typical water concentrations of several organochlorine (OC) insecticides
Compound(s) Concentration Country Reference (ng L 1)
Total OCsa 0.01–9.83 China Luo et al., 2004 Total OCs 5LODb-112 Greece Golfinopoulos et al., 2003 Total OCs 0.1–973 China Zhou et al., 2001 DDT 150–190 India Shukla et al., 2006 DDT 3.0–33.2 India Pandit et al., 2002 Lindane 680–1380 India Shukla et al., 2006 HCH 0.16–15.9 India Pandit et al., 2002
a Referred to the concentration range of compounds: DDTs (DDT and metabolites), aldrin, dieldrin, heptachlor and lindane. b LOD ¼ Limit of Detection. DDTs or HCH have also been detected in other human matrices such as serum and adipose tissues. Koppen et al. (2002) detected concentrations of p,p- DDT (2.6 ng g 1 fat), p,p-DDE (871.3 ng g 1 fat) and g-HCH (5.7 ng g 1 fat) in human serum from women in Belgium. Similarly, Botella et al. (2004) examined the presence of several organochlorine pesticides in human adipose tissues and blood samples in women from Spain. The detected mean concentrations of total DDTs in the two types of samples were 543.25 ng g 1 (human adipose tissues) and 12.10 ng mL 1 (blood samples), indicating either a relatively recent exposure or cumulative past exposure.
1.2.1.2 Effects Toxicity of organochlorine pesticides depends on several parameters including the structure of each compound, the different moieties attached to initial molecule, the nature of substituents (Kaushik and Kaushik, 2007). In many cases, compounds are considered to be moderately toxic to mammals and highly toxic to aquatic organisms. For instance, DDT is considered to be moderately
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