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Full Description
Presents cutting-edge insights on transforming agricultural waste into renewable energy, sustainable materials, and economic opportunities
The urgent need to transition toward sustainable development has propelled agro-waste management to the forefront of global research and policy initiatives. Agricultural residues, once treated as environmental burdens, now offer vast potential as renewable feedstocks for biofuels, compost, and biochar, as well as for driving innovations in the circular economy.
Agro-Waste Management and Valorization provides an authoritative and comprehensive overview of the scientific, technological, and economic frameworks required to turn agricultural waste into valuable resources. Through a multidisciplinary lens, the authors examine the chemistry, engineering, and environmental principles that shape modern waste-to-value pathways, while situating these approaches within relevant legislative and policy contexts.
The book integrates fundamental concepts, applied research, and real-world case studies to demonstrate how biological and thermochemical conversion processes, waste biorefineries, and digital innovations can advance sustainability goals. Detailed analyses of bio-additives, composting strategies, and algae-based biorefineries highlight the practical applications of waste valorization across diverse agricultural systems. In-depth chapters incorporate techno-economic analyses and life cycle assessments to equip readers with the tools needed to evaluate feasibility and long-term impact.
Both synthesizing current knowledge and charting a pathway for future inquiry and technology transfer in the field, Agro-Waste Management and Valorization:
Explores advanced bioconversion and thermochemical techniques with detailed process parameters and optimization strategies
Highlights studies of waste-to-energy technologies and their integration into sustainable agricultural systems
Analyzes international and national policy frameworks shaping agro-waste management and valorization
Examines waste biorefinery and algal biorefinery models with real-world scalability considerations
Includes techno-economic analysis (TEA) and life cycle assessment (LCA) of key technologies
Investigates innovative uses of glycerol and biochar, as well as emerging digital tools such as IoT for efficient waste monitoring and processing
Agro-Waste Management and Valorization is an essential reference for graduate and postgraduate students in environmental chemistry, chemical engineering, agricultural sciences, and biotechnology, particularly in courses such as Environmental Sustainability, Waste Management, and Renewable Energy Systems. It is equally valuable for researchers, policymakers, and professionals in biotechnological and agricultural industries who are seeking practical and research-based approaches to agro-waste valorization.
Contents
Preface xiii
1 Waste-to-value Opportunity and Challenges 1
1.1 Introduction 1
1.1.1 Waste-to-energy 2
1.1.2 Environmental Benefits 3
1.1.3 Energy Generation Potential 3
1.1.4 Economic Potential 4
1.2 Classification of Waste 6
1.2.1 Hazardous Waste 6
1.2.2 Non-hazardous Waste 8
1.3 Current Status in Waste Management 9
1.3.1 Waste Collection 9
1.3.2 Waste Consolidation and Transportation 12
1.3.3 Waste Disposal Practices 13
1.3.4 Lack of Awareness 16
1.4 Problems Encountered in Waste Handling 16
1.5 Economic Competitiveness 18
1.6 Sustainable Challenges 19
1.6.1 Feedstock Availability 20
1.6.2 Operational Challenges 23
1.7 Carbon Sequestration for Green and Sustainable Environment 24
1.8 IoT Services 26
1.9 Smart City Infrastructure 28
1.10 Conclusion and Discussion 29
References 29
2 A Perspective on the Emergence and Need for Alternate Fuels 35
2.1 Introduction 35
2.2 Challenges Associated with Conventional Fuels 36
2.3 Alternative Fuels 38
2.4 Types of AFs 39
2.4.1 Ammonia 39
2.4.2 Hydrogen 41
2.4.3 Alcohol-derived Fuels 43
2.4.3.1 Methanol 43
2.4.3.2 Ethanol 45
2.4.3.3 Dimethyl Ether 46
2.4.4 Biodiesel 47
2.5 Applications of AFs 49
2.5.1 Dual-fuel Mode 49
2.5.2 Blend Form 50
2.6 Environmental Impact and Economic Feasibility 51
2.7 Future Aspects of AFs 52
2.8 Conclusion 52
References 53
3 The Role of Waste in the Circular Economy, Policies, and Legislation 57
3.1 Introduction 57
3.2 Crucial Reasons for Implementing a Circular Economy 59
3.2.1 Restore Environment 60
3.2.2 Recycling Industry 60
3.2.3 Social Responsibility 60
3.2.4 Reduces Waste 60
3.2.5 Renewable Energy 60
3.3 Principles of the Circular Economy 61
3.3.1 Designing for Efficiency 61
3.3.2 Resource Regeneration 61
3.3.3 Closing the Loop 62
3.3.4 Promoting Renewable Energy 62
3.3.5 Systems Thinking 62
3.4 Role of Agro-waste in the Circular Economy - Examples 62
3.4.1 Biochar Production 63
3.4.2 Anaerobic Digestion 65
3.4.3 Circular Agriculture Models 65
3.5 Circular Economy Challenges 66
3.5.1 Logistical Challenges 67
3.5.2 Technological Innovation 67
3.5.3 Policy and Economic Incentives 67
3.6 Agro-waste 67
3.6.1 Classification of Agro-waste 67
3.6.2 Sources and Generation Patterns 68
3.7 Agro-waste Management: Current Practices 69
3.7.1 Current Practices in Agro-waste Management 69
3.7.2 Traditional Disposal Methods 70
3.7.3 Environmental Impacts of Agro-waste 70
3.7.4 Circular Economy Framework 71
3.7.5 Overview of Existing National and International Policies 71
3.7.5.1 The European Union Waste Framework Directive and Agro-waste in the Circular Economy 71
3.7.5.2 US Environmental Protection Agency Regulations and Agro-waste 73
3.7.5.3 India's National Policy on Biofuels and Agro-waste 75
3.8 Challenges in Implementing the Circular Economy for Agro-waste 76
3.8.1 Economic Challenges 77
3.8.2 Technological Limitations 79
3.9 Conclusion 81
References 83
4 Agro-waste Management 87
4.1 Introduction 87
4.2 Assessment of RDF and SRF 88
4.3 MSW and RDF/SRF Legislation 89
4.4 Type of Solid Waste 89
4.5 Pelletization and Incineration 91
4.6 Case Study: Energy Recovery Potential 92
4.7 Liquid-waste Management 93
4.8 Physicochemical Treatment 94
4.9 Physical or Mechanical Treatment 96
4.10 Biological Treatment 96
4.11 E-waste 97
4.12 Environmental and Health Impacts of Waste Mismanagement 98
4.13 Disposal Methods of Waste Management 98
4.14 Environmental Impacts and Considerations 99
4.15 Sustainable Waste Management 99
4.16 Biological Conversion Techniques 100
4.16.1 Composting: Processes, Chemical Engineering Aspects, and Applications 100
4.16.2 AD: Processes, Chemical Engineering Aspects, and Applications 101
4.16.3 Emerging Biological Conversion Technologies 102
4.17 Thermochemical Conversion Techniques 103
4.17.1 Pyrolysis: Unlocking the Potential of Bio-oil, Biochar, and Syngas 103
4.17.2 Alkaline Hydrolysis: Extracting Lignin and Enhancing Cellulose Digestibility 107
4.17.3 Transesterification: Transforming Agro-waste-derived Oils and Fats into Biodiesel 108
4.18 Techno-economic Analysis and Life Cycle Assessment: Evaluating Sustainability 111
4.18.1 TEA: The Bottom Line 111
4.18.2 LCA: Environmental Footprint 112
4.19 Emerging Technologies and Future Trends: Shaping the Future of Agro-waste Management 112
4.20 Conclusion 113
References 114
5 Waste Biorefinery 121
5.1 Introduction 121
5.2 Waste Feedstock for Biorefinery 123
5.3 Kinetic Analysis of Biomass 124
5.4 Conversion Processes 126
5.4.1 Thermochemical Conversions 127
5.4.2 Combined Gasification-fermentation Processes 130
5.4.3 Food Waste Biorefinery 132
5.4.4 Municipal Waste Biorefinery 135
5.4.5 Lignocellulosic Biorefinery 137
5.5 Water-based Biorefinery 139
5.6 The Economic Aspects of Waste-to-energy Biorefineries 141
5.7 Conclusion 143
References 144
6 Algal Biorefinery 149
6.1 Introduction 149
6.1.1 Algae as a Versatile Feedstock for Biorefining: An Overview 149
6.1.2 The Algal Biorefinery Concept: Integrated Processes 151
6.1.3 Potential of Agro-waste as a Nutrient Source and Environmental Benefits in Algal Biorefining 152
6.1.4 Chapter Objectives and Scope 153
6.2 Algal Biomass Cultivation 153
6.2.1 Cultivation Systems: Comparing Open Ponds and Photobioreactors 154
6.2.2 Strain Selection and Optimization of Algal Species and Nutrient Management 154
6.2.3 Harvesting and Dewatering Methods 155
6.3 Algal Biomass Processing 156
6.3.1 Pretreatment Techniques for Biomass Conversion 156
6.3.2 Extraction of Lipids, Proteins, and Carbohydrates 157
6.3.3 Fractionation and Purification Techniques 159
6.3.4 Product Recovery and Valorization 159
6.4 Biofuel Production from Algal Biomass 160
6.4.1 Production of Biodiesel, Bioethanol, and Biobutanol from Algal Lipids 160
6.4.2 HTL for Bio-oil Generation 161
6.4.3 Techno-economic and Sustainability Evaluation 163
6.5 Bioproducts and Bio-compounds from Algae 164
6.6 Integrated Algal Biorefinery Approach 166
6.7 Genetic Engineering and Algal Strain Improvement 169
6.8 Environmental Sustainability and Life Cycle Assessment in Algal Biorefining 171
6.8.1 Life Cycle Assessment Methodology 171
6.8.2 Policy and Regulatory Considerations 172
6.9 Challenges and Future Perspectives 173
6.10 Conclusion 174
References 175
7 Waste-to-bio-additive 181
7.1 Introduction 181
7.2 Types of Waste Utilized for Bio-additive Production 183
7.3 Waste-to-bio-additive Conversion Technologies 185
7.3.1 Biological Processes 185
7.3.1.1 Anaerobic Digestion 185
7.3.1.2 Fermentation 186
7.3.1.3 Composting 187
7.3.2 Thermochemical Processes 188
7.3.2.1 Pyrolysis 188
7.3.2.2 Gasification 190
7.3.2.3 Hydrothermal Processing 190
7.3.3 Physiochemical Processes 191
7.3.3.1 Hydrolysis 191
7.3.3.2 Transesterification 192
7.3.3.3 Acid/Base Catalysis 193
7.4 Applications of Bio-additives 194
7.5 LCA of Waste-of-building Applications Technologies 195
7.6 Challenges and Limitations 198
7.7 Case Studies and Success Stories 200
7.7.1 Successful Waste-to-bio-additive Projects 200
7.7.2 Future Directions and Emerging Trends 201
7.8 Conclusion and Recommendations 202
References 203
8 Agro-waste to Compost 209
8.1 Introduction 209
8.2 Defining and Categorizing Agro-waste for Composting 210
8.2.1 Crop Residues 210
8.2.2 Livestock Manure: A Nutrient-rich Bioresource 212
8.2.3 Agro-industrial Byproducts: Residues from Processing 213
8.2.4 Forestry Residues and the Integrated Waste Basket 213
8.3 The Science of Composting: Biochemical Processes and Microbial Ecology 215
8.3.1 Biochemical Processes in Composting 215
8.3.2 Microbial Ecology of Composting 216
8.3.3 Phases of Composting and Microbial Succession 217
8.4 Composting Methodologies for Agro-waste: From Traditional to Advanced Techniques 218
8.4.1 Traditional Composting Methodologies for Agro-waste 219
8.4.1.1 Pit Composting 219
8.4.1.2 The Pit Composting Process: A Simple, Ground-based Approach 219
8.4.1.3 Advantages of Implementing Pit Composting 220
8.4.1.4 Disadvantages and Limitations of Pit Composting Performance 220
8.4.1.5 Heap Composting 221
8.4.1.6 Windrow Composting 221
8.5 Advanced Composting Methodologies 222
8.5.1 Vermicomposting 222
8.5.2 In-vessel Composting 222
8.5.3 Thermal Composting (Aerated Static Pile with Forced Aeration) 223
8.6 Factors Influencing Composting Efficiency and Compost Quality 223
8.6.1 Process Design 226
8.6.1.1 Feedstock Blending 226
8.6.1.2 Particle Size Reduction 227
8.6.2 Aeration Control 227
8.6.3 Temperature Monitoring 228
8.7 Conclusion 229
References 230
9 Glycerol: From Abundant Byproduct to Valuable Bio-oil 235
9.1 Introduction 235
9.2 Production of Glycerol in Biodiesel Production 237
9.2.1 Quantity and Quality of Glycerol Generated 238
9.2.2 Challenges in Glycerol Management 239
9.3 Conversion Technologies of Glycerol to Bio-oil 240
9.3.1 Pyrolysis of Glycerol: Thermally Induced Decomposition 241
9.3.2 HTL of Glycerol: Conversion in Hot Compressed H2O 242
9.3.3 Catalytic Conversion of Glycerol: Tailored Transformations 243
9.4 Bio-oil Properties and Applications 244
9.4.1 Chemical Composition of Bio-oil: Molecular Diversity 244
9.4.2 Physical Properties of Bio-oil 247
9.4.3 Potential Applications of Bio-oil: A Versatile Renewable Resource 248
9.5 Catalytic Processes for Glycerol Conversion to Bio-oil 250
9.6 Chemistry of Glycerol Conversion to Bio-oil 253
9.6.1 Dehydration: The Initial Oxygen Removal Step 253
9.6.2 Cracking: Breaking the Carbon Backbone 254
9.6.3 Oligomerization: Formation of Larger Molecules 255
9.6.4 Aromatization: Synthesis of Cyclic Hydrocarbons 255
9.6.5 Other Reactions: Diverse Transformation Routes 256
9.7 Reactor Design and Process Optimization for Glycerol Conversion to Bio-oil 258
9.8 Challenges and Limitations 262
9.9 Commercial Glycerol-to-bio-oil Plant 263
9.10 Conclusion 264
References 265
10 Production of Biochar 273
10.1 Introduction 273
10.1.1 Biochar: Properties, Applications, and Significance 273
10.1.2 Agro-waste-to-biochar Conversion: A Sustainable and Circular Approach 275
10.1.3 Scope and Objectives 275
10.2 Agro-waste Feedstocks for Biochar Production 278
10.2.1 Classification and Characteristics of Agro-waste Feedstocks 278
10.2.2 Influence of Feedstock Composition on Biochar Production and Properties 279
10.2.3 Pretreatment of Agro-waste Feedstocks 281
10.2.3.1 Drying: Essential Moisture Management 282
10.2.3.2 Size Reduction: Optimizing Heat and Mass Transfer 283
10.2.3.3 Washing: Cleaning and Purification of Feedstock 284
10.2.3.4 Torrefaction: Thermal Upgrading for Enhanced Feedstock Properties 285
10.3 Pyrolysis: Thermal Decomposition for Biochar Maximization or Bio-oil Production 289
10.4 Gasification: Primarily Syngas Production with Biochar as a Byproduct 292
10.4.1 Gasification Process and Operating Conditions 293
10.4.2 Biochar Production from Gasification 294
10.4.3 Advantages and Disadvantages of Gasification 294
10.5 HTC: A Wet Biomass Solution 294
10.5.1 HTC Process and Operating Conditions 295
10.5.2 Hydrochar Production and Properties from HTC 297
10.5.3 Advantages and Disadvantages of HTC 297
10.6 Comparative Analysis and Future Trends 298
10.7 Conclusion 299
References 299
11 Waste Valorization for Biogas Production: A Pathway to a Circular Economy 305
11.1 Introduction 305
11.2 Biogas Production - A Versatile Energy Source 306
11.3 Agro-waste as a Resource 308
11.4 Pretreatment of Agro-waste 310
11.4.1 Physical Pretreatment 311
11.4.2 Chemical Pretreatment 312
11.4.3 Physiochemical Pretreatment 313
11.4.4 Biological Pretreatment 313
11.5 Process Technology - Agro-waste to Bioenergy 314
11.5.1 Hydrolysis 314
11.5.2 Anaerobic Digestion 315
11.5.3 Dark Fermentation 316
11.5.4 Transesterification 316
11.5.5 Creating Wealth from the Agro-waste 317
11.5.6 Economic Valuation of Agro-waste 318
11.6 Factors Influencing the Efficiency of Agro-waste-to-biogas Systems 319
11.6.1 Digester Design and Configuration 320
11.7 Digestate Utilization and Impact 323
11.7.1 Digestate Composition and Variability 323
11.7.2 Impact of Digestate on Soil Health and Crop Productivity 324
11.8 Conclusion 325
References 326
12 Digitalization for Agro-waste Management 333
12.1 Introduction 333
12.2 Infrastructure for Agro-waste Management 335
12.2.1 Environmental Benefits 335
12.2.2 Health Benefits 336
12.2.3 Economic Benefits 336
12.2.4 Social Benefits 337
12.3 Improved Resource Allocation with Geospatial Tools 338
12.4 Enhanced Monitoring of Waste Generation and Collection through IoT Sensors 340
12.5 The Imperative of Efficient Agricultural Waste Transportation 342
12.6 Smart Logistics: A Paradigm Shift in Waste Transportation 343
12.6.1 Components of Smart Logistics Solutions for Waste Transportation 344
12.6.2 Challenges and Future Directions 346
12.6.3 Better Decision-making with Real-time Data and Predictive Analytics 352
12.7 Communication Networks 353
12.7.1 Coverage and Reliability 354
12.7.2 Benefits of Communication Networks 354
12.7.3 Challenges 355
12.8 Cloud Computing and Storage 356
12.8.1 Availability and Utilization 356
12.8.2 Benefits and Challenges of Cloud Computing and Storage 356
12.9 Technological Applications in Agro-waste Management 358
12.9.1 Monitoring and Tracking Systems 358
12.9.2 Adoption of Technologies 358
12.9.3 Benefits and Challenges of Monitoring and Tracking Systems 358
12.10 Predictive Analytics 360
12.10.1 Implementation of Predictive Models 360
12.10.2 Benefits and Challenges of Predictive Analytics 361
12.11 Automation and Robotics 362
12.12 Conclusion 364
References 365
Index 371
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