**Section 1: "Recycling of Polymeric Materials"**

Chapter 1: "Are Reliable and Emerging Technologies Available for Plastic Recycling in a Circular Economy?"

This chapter presents the main environmental and sustainability issues concerning plastic disposal and recycling. It discusses thermal, chemical, and biological depolymerization processes, including pyrolytic technologies. It concludes that evaluation of new processes requires performance assessment for understanding how plastic recycling technologies contribute to the environment and the sustainable reuse of plastic materials.

Chapter 2: "Recent Advances in Pre-Treatment of Plastic Packaging Waste"

This chapter examines the pre-treatment processes used to remove contaminants from plastic packaging waste and the advances that are being developed and/or

optimized to achieve closed-loop recycling. Some of the techniques presented include chemical washing to remove inks, extraction to remove undesired plastic additives, delamination, and dissolution-precipitation.

Chapter 3: "Current Topics in Plastic Recycling"

This chapter presents an overview of current trends in plastics recycling focusing on pyrolysis. Emphasis is given to three case studies where special polymer recycling techniques are required: polymeric blends, multilayer plastic packaging, and brominated flame retarded plastics originating in waste electric and electronic equipment (WEEE).

Chapter 4: "Chemical Recycling of Polyolefins (PE, PP): Modern Technologies and Products"

This chapter presents several process paths for the chemical recycling of polyolefins (polyethylene and polypropylene), such as pyrolysis for the recovery of intermediates in petrochemical plants, fuels, or gasification from which a mixture of H2, CO, and CO2 is produced, which can be further transformed into chemicals and fuels or used directly to produce energy. The chapter also provides examples of existing technologies and their level of technology readiness and perspectives for scale-up.

Chapter 5: "Polyethylenes: A Vital Recyclable Polymer"

This chapter discusses the production, properties, processing, and recycling of polyethylene. It discusses the processing of recycled polyethylene as well as the limitations of polyethylene recycling. Finally, the chapter examines hazardous situations that may arise from recycling polyethylene.

Chapter 6: "An Evaluation of Recycled Polymeric Materials Usage in Denim with Lifecycle Assesment Methodology"

This chapter analyzes the advantages and challenges of different chemical and biological recycling technologies in denim production. Life Cycle Assessment (LCA) analysis is used to evaluate the environmental impact of recycled polymeric materials usage in denim fabrics. It concludes with the opportunities of using waste in denim production as a raw material to design circular systems.

Chapter 7: "Retreatment of Polymer Wastes by Disintegrator Milling"

This chapter presents mechanical recycling by *disintegrator milling* of several composite polymers. The groups of polymer materials studied include pure brittle and soft polymers (PMMA, HDPE and IER), blends of plastics (ABS+PMMA, PC+ABS), reinforced plastics (PMMA+GFP), elastomers (rubber and tires), and printed circuit boards (PCB).

Chapter 8: "Effect of Environmental Aging on Tensile Properties of Post-Consumer Recycled (PCR) Polycarbonates"

This chapter compares tensile properties of different grades of post-consumer recycled polycarbonate (PC) plastics with conventional or virgin PC before and after different aging conditions. It seems that with the presence of temperature

**V**

to ensure replicability.

and humidity aging, tensile strength starts to decrease over time, but recycled PC

Chapter 9: "Performance Analysis and Modeling of Microplastic Separation through

This chapter examines a method involving machining obsolete thermoset composite products into strips or flakes for re-use as reinforcing elements, which, when combined with fresh resin and fiber, enable the production of new components. This method has been proven in manufacturing retaining walls as well as guide beams for canals and bridge decking, all using strips or flakes from end-of-life composite

This chapter explores the idea of recycling the renewables in nature phytomass for producing activated carbon that could find several applications, such as in catalytic supports, the removal of pollutants, gas storage, and so on. It also presents research insights into the identification of unexplored phytomass or wastes that could lead

Chapter 12: "A Zero-Waste Process for the Treatment of Spent Potliner (SPL) Waste"

This chapter presents a deep analysis of an environmentally friendly process to recover all valuable minerals contained in spent potliner such as graphite carbon and aluminum fluoride (AlF3) and production of sodium sulfate (Na2SO4) and

This chapter focuses on the circular economy, urban mining, and their intersection with consumer behavior by providing a review of existing and emergent EU regulations for enhancing the collection rate of household WEEE. Then, the chapter critically analyzes the literature on the intersection between consumer behavior and closed-loop supply chains for EEE, identified through a systematic keyword search

Chapter 14: "Compost, Social Sustainability, and Circular Economy in Guatemala"

This chapter examines several issues in Guatemala City, specifically the dynamics for initiating a new start-up composting business operating under the principles of

Chapter 11: "Phytomass-Derived Multifunctional Activated Carbon as a

"Wonder-Material": A Paradigm Shift of Filth-to-Wealth"

gypsum (CaSO4) when H2SO4 is used as the leaching agent.

**Section 3: "Role of the Society in Recycling and Circular Economy"**

Chapter 13: "Urban Mining of e-Waste and the Role of Consumers"

This chapter highlights the capabilities of a hydro cyclone at separating microplastics from water using mathematical and computational fluid dynamics (CFD) modeling. The results show that hydro cyclone microplastic separation can achieve

shows similar aging behavior compared to virgin PC.

**Section 2: "Valorization of Waste Materials"**

Chapter 10: "Industrial Re-Use of Composites"

to carbon with novel properties.

Hydro Cyclones"

98% efficiency.

products.

and humidity aging, tensile strength starts to decrease over time, but recycled PC shows similar aging behavior compared to virgin PC.

Chapter 9: "Performance Analysis and Modeling of Microplastic Separation through Hydro Cyclones"

This chapter highlights the capabilities of a hydro cyclone at separating microplastics from water using mathematical and computational fluid dynamics (CFD) modeling. The results show that hydro cyclone microplastic separation can achieve 98% efficiency.
