Preface to the 3rd Edition xxi Acknowledgements xxiii Section I: Fundamentals 1 1 Introduction to Reverse Osmosis: History, Challenges, and Future Directions 3 1.1 Introduction 3 1.2 A Brief History of Reverse Osmosis 5 1.2.1 Early Development 5 1.2.2 Advances 1970s-1980s 10 1.2.
3 Advances from 1990s through the Early 2000s 12 1.3 Challenges and Prospects 14 1.3.1 Membrane Materials Development 15 1.3.2 Modification of Element Construction for Ultra-High Pressure or High-Temperature Operation 17 1.3.2.
1 Ultra-High Pressure Spiral Wound RO 17 1.3.2.2 High-Temperature Elements 18 1.3.3 Optimization of RO Element Feed Channel Spacer 19 1.3.4 Other Advances and Future Requirements 23 1.
4 Summary 26 Symbols 26 Nomenclature 27 References 27 2 Principles and Terminology 33 2.1 Semipermeable Membranes 33 2.2 Osmosis 33 2.3 Reverse Osmosis 35 2.4 Basic Performance Parameters: Recovery, Rejection, and Flux 35 2.4.1 Recovery and Concentration Factor 35 2.4.
2 Rejection 38 2.4.3 Flux 41 2.4.3.1 Water Flux 41 2.4.3.
2 Solute Flux 43 2.5 Filtration 43 2.5.1 Dead-End Filtration 43 2.5.2 Cross-Flow Filtration 43 2.6 Concentration Polarization 45 Symbols 47 Nomenclature 48 References 48 3 Membranes: Transport Models, Characterization, and Elements 51 3.1 Membrane Transport Models 51 3.
1.1 Solution-Diffusion Transport Model 52 3.1.2 Modified Solution-Diffusion Transport Models 55 3.1.2.1 Solution-Diffusion Imperfection Model 55 3.1.
2.2 Extended Solution-Diffusion Model 56 3.1.3 Pore-Based Transport Models 56 3.1.4 Models Based on Non-Equilibrium Thermodynamics 57 3.2 Polymeric Membranes 57 3.2.
1 Cellulose Acetate 57 3.2.2 Linear Polyamide (Aramids) 61 3.2.3 Fully Aromatic Polyamide Composite Membranes 63 3.2.3.1 NS-100 Membrane 64 3.
2.3.2 FT-30 Composite Membrane 67 3.2.4 Characterization of CA and Composite Polyamide Membranes 73 3.2.4.1 Surface Roughness 73 3.
2.4.2 Zeta Potential (Surface Charge) 76 3.2.4.3 Hydrophilicity 76 3.2.5 Other Membrane Polymers 78 3.
3 Membrane Elements 80 3.3.1 Plate and Frame Elements 81 3.3.2 Tubular Elements 82 3.3.3 Hollow Fine Fiber Elements 83 3.3.
4 Spiral Wound Elements 84 3.4 Specialty Membranes and Elements 91 3.4.1 Specialty Membranes 91 3.4.1.1 Dry Membranes 91 3.4.
1.2 Boron-Rejecting Membranes 92 3.4.2 Specialty Elements 93 3.4.2.1 Sanitary Elements 93 3.4.
2.2 Disc Tube Elements 94 3.4.2.3 Vibratory Shear Enhanced Processing (VSEP) Elements and System 94 3.4.2.4 Ultra-High Pressure and High Temperature Elements 95 Symbols 95 Nomenclature 96 References 97 Section II: System Design and Engineering 103 4 Basic Design Arrangements and Concentration Polarization Guidelines 105 4.
1 Arrays and Stages 105 4.1.1 Recovery per System Array 106 4.1.2 Element-By-Element Flow and Quality Distribution 108 4.1.3 Flux Guidelines 109 4.1.
4 Cross-Flow Velocity Guidelines for Array Design 111 4.1.5 Concentrate Recycle 112 4.2 Passes 113 Symbols 115 Nomenclature 115 References 115 5 RO System Design Using Design Software 117 5.1 RO System Design Guidelines 117 5.2 Step-by-Step Design--Sample Problem 118 5.2.1 Step 1--Water Flux 119 5.
2.2 Step 2--Membrane Selection 119 5.2.3 Step 3--Number of Elements Required 119 5.2.4 Step 4--System Array 120 5.3 Design Software 121 5.3.
1 Water Application Value Engine (WAVE)-- DuPont Water Solutions 123 5.3.2 IMSDesign--Hydranautics 131 5.3.3 Q+ Projection Software LGChem 135 5.4 Optimum Design Result for the Sample Problem 140 Symbols 141 Nomenclature 141 References 142 6 Design Considerations 143 6.1 Feed Water Source and Quality 143 6.1.
1 Feed Water Source 143 6.1.2 Feed Water Quality and Guidelines 145 6.1.3 pH 147 6.1.3.1 pH Profile Through an RO System-- Alkalinity Relationships 148 6.
1.3.2 pH and Membrane Scaling Potential 148 6.1.3.3 pH Effects on Solute Rejection and Water Permeability 149 6.2 System Operations 149 6.2.
1 Pressure 149 6.2.2 Compaction 151 6.2.3 Temperature 155 6.2.4 Balancing Flows 156 6.2.
5 Designing for Variable Flow Demand 157 6.3 Existing RO System Design Considerations 157 6.3.1 Changing Membranes 157 6.3.1.1 Changing Membrane Area 158 6.3.
1.2 Changing Membrane Types 158 6.3.1.3 Mixing Membrane Types 158 6.3.2 Increasing Recovery 159 6.3.
3 Changing Feed Water Sources 160 6.3.4 Reducing Permeate Flow 161 Symbols 161 Nomenclature 161 References 162 7 RO Equipment 163 7.1 Basic RO Skid Components 163 7.1.1 Cartridge Filters 164 7.1.2 High Pressure Feed Pump 172 7.
1.3 Pressure Vessels 177 7.2 Skid Design Considerations 181 7.2.1 Piping Materials of Construction 181 7.2.2 Feed Distribution Headers 183 7.2.
3 Stage-by-Stage Cleaning 184 7.2.4 Sampling and Profiling/Probing Connections 187 7.2.5 Instrumentation 188 7.2.6 Controls and Data Acquisition/Analysis 193 7.2.
6.1 System Control 193 7.2.6.2 Data Acquisition and Analysis 194 7.2.7 Designs for Variable Permeate Flow Demand 195 7.3 Energy Recovery Devices (ERDs) 196 7.
3.1 ERD Types 196 7.3.2 ERD Applications for RO 197 7.3.2.1 Single-Stage RO 197 7.3.
2.2 Multi-Stage RO 197 7.4 Clean-In-Place (CIP) Equipment 200 7.5 Mobile RO Equipment 203 Symbols 205 Nomenclature 205 References 206 Section III: Membrane Deposition and Degradation: Causes, Effects, and Mitigation via Pretreatment and Operations 207 8 Membrane Scaling 211 8.1 What is Membrane Scale? 211 8.2 Effects of Scale on Membrane Performance 212 8.3 Hardness Scales 215 8.3.
1 Types of Hardness Scale 215 8.3.1.1 Carbonate-Based Hardness Scales 215 8.3.1.2 Sulfate-Based Hardness Scales 216 8.3.
1.3 Other Calcium Scales: Calcium Phosphate and Calcium Fluoride 218 8.3.2 Mitigation of Hardness Scales 219 8.3.2.1 Chemical Pretreatment--Acid and Antiscalant Dosing 220 8.3.
2.2 Non-Chemical Pretreatment--Sodium Softening and Nanofiltration 221 8.3.2.3 Operational Techniques--Flushing, Reverse Flow, and Closed Circuit Desalination 225 8.4 Silica Scale 226 8.4.1 Forms and Reactions of Silica 227 8.
4.2 Factors Affecting Silica Scale Formation 228 8.4.3 Mitigation of Silica Scale 232 8.5 Struvite 236 8.5.1 What is Struvite? 236 8.5.
2 Mitigation of Struvite 238 8.6 Scaling Mitigation Guidelines--Summary 239 Symbols 240 Nomenclature 240 References 240 9 Generalized Membrane Fouling 249 9.1 What is Membrane Fouling? 249 9.2 Classification and Measurement of Potential Foulants 250 9.2.1 Settleable and Supra-Colloidal Particulates 251 9.2.2 Colloids 252 9.
2.2.1 Measurement of Colloids for RO Applications--Silt Density Index (SDI15) 252 9.2.2.2 Measure of Colloids--Modified Fouling Indices 255 9.2.2.
3 Summary of Colloidal Fouling Indices 257 9.2.3 Natural Organic Material (NOM) 257 9.2.4 Other Organics 259 9.2.5 Other Foulants: Cationic Coagulants and Surfactants, and Silicone-Based Antifoams 259 9.2.
6 Metals: Aluminum, Iron, Manganese, and Sulfur 259 9.2.6.1 Aluminum 259 9.2.6.2 Iron and Manganese 261 9.2.
6.3 Hydrogen Sulfide 262 9.3 Effects of Fouling on Membrane Performance 265 9.3.1 Effects of Inorganic Foulants 266 9.3.1.1 Fouling with Larger Settleable and Supra-Colloidal Solids 266 9.
3.1.2 Cake Layer Surface Fouling with Colloids 266 9.3.1.3 Feed Channel Fouling 268 9.3.1.
4 Summary of Fouling Effects of Inorganic Particulates and Colloids 271 9.3.2 Effects of NOM and Other Organics 273 9.3.2.1 Effects of NOM--Humic Acids 273 9.3.2.
2 Effects of Hydrocarbons 276 9.3.2.3 Effects of Cationic Coagulants and Surfactants 278 9.3.2.4 Summary of the Effects of Organic Surfactant and Antifoam Fouling on Membrane Performance 279 9.4 Pretreatment to Minimize Membrane Fouling 279 9.
4.1 Primary Pretreatment--Clarification for Colloids and Organics (NOM) Removal 280 9.4.1.1 Coagulation 280 9.4.1.2 Flocculation 283 9.
4.2 Pressure Filtration: Particles, SDI15 , and Organics Removal 283 9.4.2.1 Multimedia Pressure Filters: Suspended Solids Removal 283 9.4.2.2 Catalytic Filters: Soluble Iron, Manganese, and Hydrogen Sulfide Removal 287 9.
4.2.3 Carbon Filters: TOC Removal 292 9.4.2.4 Walnut Shell Filters: Hydrocarbon Oil Removal 296 9.4.2.
5 Cartridge Filters: What is Their Purpose? 299 9.4.3 Membrane Filtration Turbidity, SDI 15 , and Metal Hydroxide Removal 300 9.4.3.1 Membrane Materials and Elements 301 9.4.3.
2 Membrane Filtration Operations-- Polymeric Membranes 306 9.4.3.3 Membrane Filtration as Pretreatment for RO 311 9.4.4 Nanofiltration (NF): Organics and Color Removal 321 9.5 Feed Water Quality Guidelines to Minimize Membrane Fouling 323 Symbols 324 Nomenclature 324 References 326