| Preface | p. v |
| An Introduction to Wetlands in the Tropics | p. 1 |
| Definitions of Wetlands | p. 1 |
| Geographic Distribution of Tropical Natural Wetlands | p. 3 |
| Adoption to the Tropical Environment | p. 5 |
| Constructed Wetlands in Tropical Climates | p. 6 |
| Examples of Applications | p. 11 |
| The Tropical Environment | p. 13 |
| Population and Food Production | p. 13 |
| Demographics changes | p. 15 |
| The rural economy | p. 15 |
| Agriculture | p. 16 |
| Changing Environments | p. 18 |
| Water resources | p. 18 |
| Water scarcity | p. 20 |
| Environmental Degradation | p. 22 |
| Access to safe water and pollution | p. 22 |
| Wastewaters | p. 23 |
| Protecting the Environment | p. 25 |
| Wastewater management | p. 25 |
| Integrated water resources management (IWRM) | p. 26 |
| The role of government agencies and society | p. 28 |
| Pollutants and Wetland Treatment | p. 29 |
| Wetland Treatment Process | p. 29 |
| Introduction | p. 29 |
| Types of wetlands | p. 30 |
| Wetland configuration | p. 31 |
| Wetland hydrology | p. 34 |
| Soils in the wetland | p. 35 |
| Wedand vegetation | p. 37 |
| Role of wetland vegetation in the treatment process | p. 38 |
| Pollutants and Their Transformations | p. 39 |
| Biodegradable organics | p. 39 |
| Suspended solids | p. 41 |
| Nitrogen | p. 42 |
| Phosphorus | p. 44 |
| Sulfur | p. 45 |
| Wetland Plant Dynamics | p. 47 |
| Types of Macrophytes and Factors Affecting Their Growth | p. 47 |
| Introduction | p. 47 |
| Submergent macrophytes | p. 47 |
| Emergent macrophytes | p. 49 |
| Floating and floating-leave macrophytes | p. 49 |
| Factors affecting macrophyte growth | p. 51 |
| Effect of harvesting in wedands | p. 53 |
| The emission of greenhouse gases in the tropical wetlands | p. 54 |
| Role of Macrophytes in Wedands | p. 56 |
| Plant Physiology | p. 61 |
| Case Study on Growth Characteristics of Wetland Macrophytes | p. 63 |
| Design of Tropical Constructed Wetlands | p. 69 |
| The Importance of Wastewater Quality Parameters in Facility Design | p. 69 |
| Influent wastewater characteristics and effluent water quality requirements | p. 69 |
| Potential of wedands for wastewater treatment under tropical conditions | p. 70 |
| How wedands improve water quality | p. 73 |
| Process Design ù Reaction Rate and Hydraulic Residence Time (HRT) | p. 77 |
| Reaction rates and HRT | p. 77 |
| Sizing of constructed wetland (FWS and SSF) | p. 79 |
| Water depth in FWS | p. 82 |
| Bed depth in SSF | p. 82 |
| Effect of evaporation on the design | p. 82 |
| Integration of wedand designs | p. 83 |
| Water Quality Improvement ù A Tropical Case Study | p. 83 |
| Effectiveness of Scirpus grossus in the treatment of domestic wastes in a constructed wetland | p. 83 |
| Effects of Vegetation on Water Quality Improvement | p. 90 |
| Engineering the Wetlands | p. 95 |
| Introduction | p. 95 |
| Flow Control | p. 95 |
| Need for flow control | p. 95 |
| Inlet and outlet structures | p. 96 |
| Substrate in Wetlands | p. 99 |
| Sand and gravel | p. 99 |
| Organic substrate | p. 100 |
| Construction Aspects | p. 100 |
| Site conditions | p. 101 |
| Soil conditions | p. 102 |
| Drainage | p. 102 |
| Piping work | p. 103 |
| Side walls | p. 104 |
| Synthetic liners and clay liners | p. 106 |
| Planting | p. 108 |
| Fencing and protection | p. 110 |
| Pre-Treatment for the Wedand System | p. 110 |
| Stormwater bypass | p. 110 |
| Removal of solids (screens, silt traps, and traps for floating material) | p. 111 |
| Maintenance of Wedands | p. 111 |
| Introduction of common aspects of failures and maintenance | p. 111 |
| Frequency of maintenance of wetland plants, systems, and hydraulics | p. 111 |
| Cost and Sustainability of Constructed Wetlands | p. 115 |
| Introduction | p. 115 |
| Land value and location | p. 116 |
| Treatment goals | p. 117 |
| Type of wetlands | p. 117 |
| Construction Costs | p. 118 |
| Basic cost components | p. 118 |
| Operation and Maintenance Costs | p. 125 |
| Sustainability of Constructed Wetlands in Tropics | p. 126 |
| Ecological and economic sustainabilities | p. 126 |
| Longevity of constructed wetlands | p. 128 |
| Socio-environmental aspects of constructed wetland management ù lesson learnt | p. 129 |
| References | p. 131 |
| Index | p. 147 |
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