Plastic Solid Waste Research Articles

Study on the prediction of economic efficiency for a tertiary recycling plant for waste plastics by using the environmental Kuznets’ curve model

Plastic products are items that we use every day around us, and their replacement speed are very fast, so that to recycle waste plastic has become the focus of environmental problems. This study has proposed an optimized circular design for the recycle plant of waste plastic, therefore, and our proposed strategy is to build a new tertiary recycling plant to reduce the total generation amount of the derived solid plastic waste from ordinary and secondary recycling plants and the semi-finished products from secondary recycling plant. Results obtained from a real recycle plant has showed that to recycle the tertiary waste plastic in a tertiary recycling plant, the finished products produced from a secondary recycling plant accounts about 27% of ordinary waste plastic, and the semi-finished products that mainly is scrap hardware accounts about 1% of ordinary waste plastic. Other derived solid plastic waste accounts for 6% of ordinary plastic waste. Therefore, if the ordinary, secondary and tertiary recycle plant can be set all-in-one, it can reduce the total generation amount of derived solid plastic waste from 34% to 6%, without and with a tertiary recycling plant, respectively. It can also increase the operating income of the secondary recycle plant and the investment willingness of the new tertiary recycle plant.

Impacts of washing and deodorization treatment on packaging-sourced post-consumer polypropylene

AbstractEmerging legal requirements will likely considerably heighten demand for high-quality recycled raw materials for e.g., packaging and automotive applications; key EU legislation mandates recycling as the future end-of-life option for municipal solid plastic waste. Yet recycled plastic use remains low due to safety concerns, undesirable aesthetic, olfactory, and mechanical properties, mainly attributable to contaminants present in recyclates. Advanced treatment options for recovered polypropylene (PP) packaging and the impact of such treatments on the polymer are currently poorly documented. We investigated the effectiveness of hot/cold washing and hot air devolatilization treatments in removing volatile substances from residential post-consumer PP plastic waste to improve its scope of application and value and to assess possible side effects on mechanical and processing parameters. Cold- and hot-washed recyclates exhibited similar contaminant levels and most substances were removed within 7 h. The recycling procedure had no adverse effects on mechanical or processing parameters although reprocessing caused polymer degradation, indicated by decreasing viscosity, elongation at break, and tensile strength. Washing and hot air devolatilization treatment of plastic wastes improve their scope of application and value by enhancing mechanical properties and considerably reducing the amounts of odorous substances, but is often not suited to high-quality applications, such as packaging. The dominance of packaging waste and strict legislation on food-grade recyclate applications will make widespread recyclate use challenging since it represents the primary use of plastic. Recyclate must consequently be extensively utilized in non-food contact applications until advances in waste sorting, washing, and devolatilization yield less contaminated recyclates with improved properties.

Effect of Feedstock Blends and Equivalence Ratio on the Thermal Arc Plasma Assisted Co-Gasification of Biomass and Plastic using Air-Blown Downdraft Reactor

Plastic waste is known to cause an emerging environmental pollution, posing risks to both terrestrial and aquatic ecosystems. Co-gasification method is an alternative way to reduce municipal solid waste and plastic waste by converting it into useful gas fuel energy. The present study used empty fruit bunch biomass (EFB), plastic waste of low-density polyethylene (LDPE) and Polyethylene terephthalate (PET) as a feedstock for thermochemical conversion process into syngas fuel energy via plasma co-gasification method. The effect of multiple feedstocks mixture between biomass and plastic and equivalence ratio on the compositions of produced syngas, high heating value (HHV), lower heating value (LHV), cold gas efficiency (CGE) and carbon conversion efficiency (CCE) were critically investigated. A reactor of air-blown downdraft arrangement was used in these experiments. The gasifying agent flow rate of air was set at the frequency range of 10 to 22Hz to achieve equivalence ratio between 0.15 to 0.30. The blending ratio (BR) between biomass and plastic (EFB:Plastic) were set as E90:P10, E80:P20 and E70:P30. The results indicate that H2 and CO composition is typically decrease as ER increase for the mixture of EFB and LDPE. In contrast, the composition of H2 and CO is generally increase as ER increases. However, the maximum value of H2 and CO is dominated by the mixture of EFB and LDPE at any blending ratio and lower ER condition. This is due to the higher element of H, C and O in the raw material of EFB and LDPE compared to PET. This study is crucial in understanding the synergistic effect of co-gasification assisted with plasma reaction between biomass and plastic waste.

Assessing Health and Environmental Risks: Educational Awareness on Plastic Usage and Solid Waste Disposal in Bahawalpur

The review paper explores the increasing challenges posed by plastic pollution and improper solid waste management in Bahawalpur. The population has continued to increase, and there is ever-increasing urbanization; this has contributed to the increase in plastic and solid waste production, such as the single use of plastic bags and bottles. These waste materials contribute to environmental degradation, affecting soil quality and contaminating water systems. Improper disposal contributes to public health challenges like respiratory and waterborne diseases and vector-borne ailments like malaria and dengue fever. A fully equipped waste management framework is needed to solve more problems in Bahawalpur; this leads to a filled drainage system, urban flooding, and the discharge of hazardous wastes. The review also explains the level of community health education used to ensure sustainable waste management practices are practiced. Hence, the paper encourages the involvement and expansion of community-based programs and public or private-founded collaboration to support and practice recycling and the appropriate management and minimization of single-use plastics. Smart solutions are also briefly touched upon as potential solutions, including implementing waste-to-energy plants and smart bins. Consequently, this review calls for enhanced stewardship, more specific to public sensitization against further pollution of Bahawalpur and other similar urban settings by plastic and solid waste.

Exploring black kite (Milvus migrans) dynamics: Seasonal abundance and habitat preferences in an urban gradient

Urban expansion globally has altered biodiversity by transforming urban habitats, leading to habitat loss and changes in ecological systems. Black kites (Milvus migrans) are adaptable raptors across diverse landscapes, from natural to highly urbanized areas. This study focuses on Gujranwala City, Pakistan, a unique habitat offering insights into black kite ecology along an urban gradient. The research assesses seasonal abundance, temperature and humidity impacts, behavioral activities, and habitat preferences of black kites. Results show higher abundance in urban areas, influenced by environmental factors and food availability from anthropogenic sources. Black kites exhibit time-dependent associations with temperature and humidity, especially before sunset. Additionally, a significant correlation is observed between black kite abundance and solid waste components, particularly food and plastic waste, in the urban area. These findings contribute to understanding urban ecology, highlighting the adaptability of black kites to human-modified environments and the potential implications for conservation and management strategies.

Municipal Solid and Plastic Waste Co-pyrolysis Towards Sustainable Renewable Fuel and Carbon Materials: A Comprehensive Review.

The substantial rise in global energy demand, propelled by industrial expansion, population growth, and transportation needs, poses a formidable challenge. The concurrent urbanization places pressure on the disposal of solid municipal solid waste and the management of plastic waste. Addressing the global waste crisis requires innovative and sustainable garbage disposal solutions with an environmentally friendly approach. This review tackles the challenges of worldwide waste management, focusing on renewable and sustainable fuels and waste recycling through the exploration of co-pyrolysis as an innovative method. It explores the characteristics and environmental impact of municipal solid waste (MSW) and plastic waste (PW), delving into pyrolysis fundamentals, processes, and challenges. The primary emphasis is on co-pyrolysis, elucidating its integration of municipal and plastic waste, synergistic effects, and advantages. The manuscript thoroughly analyzes reaction kinetics, thermodynamics, and the feasibility of co-pyrolysis for energy recovery. It also delves into the synthesis of renewable fuels and valuable chemical intermediates, considering optimization of product distribution. Environmental and economic sustainability aspects, including impact assessment, greenhouse gas emissions, life cycle analysis, and cost analysis of co-pyrolysis processes, are comprehensively investigated. The review underscores the economic benefits of renewable fuel and chemical materials synthesis. The conclusion addresses challenges, proposes future directions, outlines limitations, technical challenges, environmental considerations, and recommends further exploration and integration with other waste management techniques. The manuscript emphasizes the ongoing importance of research in this critical field, aiming to contribute to the development of effective solutions for the escalating global waste management crisis.

Supply Chain Analysis of Municipal Solid Waste Released in Hetauda Sub-Metropolitan City of Nepal

In Nepal, solid waste management is one of the major environmental issues, especially in the urban areas. While solid waste management (SWM) has become a major concern for municipalities and the country as a whole, the status of SWM is not fully understood due to the lack of SWM baseline data, which are also essential for effective planning. Such a back drop, this research attempts to assess the plastic waste released, management and recycling in supply chain in Hetauda Sub-Metropolitan City. This study revealed that about 83.8% households segregate their waste. None of the surveyed households have had public waste collection bin nearby their home whereas all households have had knowledge on solid waste management. About 63% HHs heard of importance of plastic waste recycling and all express their readiness to segregate the plastic solid waste if recycling program is set up in municipal area. Per capita waste generation per day is 141 gm out of which about 15% is plastic waste. On an average daily waste released at household level are 0.8 kg/HH which is 28.1 kg per institution. Total wastes release per day from Hetauda city is 27.4 MT and 10006.8 MT per year. About 931 MT plastic per year are gone in dumping sites in the Hetauda Sub-Metropolitan City. This study suggests that municipal office needs to develop an appropriate policy and strategy framework together with technical guidelines on key issues such as organic composting, recycling and landfill operation from dumping sites. Int. J. Soc. Sc. Manage. Vol. 11, Issue-3: 34-42.

Generation charaterristics of solid waste and plastic waste: A case study in Long An highschool

Generation charaterristics of solid waste and plastic waste: A case study in Long An highschool

Nanohybrids with potential barrier property and antimicrobial activity for application in sustainable polymer food packaging: A mini‐review

AbstractPackaging has important functions for products, contributing to their protection and presenting information. Recognizing that food loss and waste affect all countries, it is necessary to search for alternatives that change this scenario, such as active packaging. Particles with sizes between 1 and 100 nanometers (nanoparticles) are incorporated into polymeric materials because they are capable of improving or even providing properties that the film formed by the pure polymer does not have, due to its surface area being greater than that of macro‐sized particles. If two nanoparticles are previously combined to form a nanohybrid before being dispersed in a polymeric matrix, in addition to having this purpose, they can provide even better results when incorporated, due to the synergistic effects that can be attributed to the nanoparticles used. The utilization of active packaging composed of nano‐hybrids within biodegradable polymers holds significant potential for reducing solid plastic waste and the generation of persistent microplastics, thereby positively impacting human health. In this literature review, the effects of nanohybrid on antibacterial and barrier properties for application in food packaging in polymeric matrices were investigated using materials such as: nickel nanoparticles, zinc oxide nanoparticles, silver nanoparticles, copper oxide nanoparticles, cellulose nanowhiskers, Cloisite 30B, sodium alginate, poly(ethylene oxide), starch, poly(vinyl alcohol), chitosan and gelatin. The results were found to show the efficiency of nanohybrids in polymeric matrices, decreasing the water vapor and oxygen permeability and also increasing the antibacterial activity, which can prevent illnesses stemming from contaminated food occurs.

Forecasting municipal solid plastic waste generation and management policy using system dynamics: a case study of Khulna City in Bangladesh

A comprehensive analysis of municipal solid plastic waste (MSPW) management while emphasizing plastic pollution severity in coastal cities around the world is mandatory to alleviate the augmenting plastic waste footprint in nature. Thus, decision-makers’ persuasion for numerous management solutions of MSPW flow-control can be met through meditative systematic strategies at the regional level. To forecast solutions focused on systematic policies, an agent-based system dynamics (ASD) model has been developed and simulated from 2023 to 2040 while considering significant knit parameters for MSPW management of Khulna City in Bangladesh. Baseline simulation results show that per-capita plastic waste generation will increase to 11.6 kg by 2040 from 8.92 kg in 2023. Eventually, the landfilled quantity of plastic waste has accumulated to 70,000 tons within 18 years. Moreover, the riverine discharge has increased to 834 tons in 2040 from a baseline quantity of 512 tons in 2023. So the plastic waste footprint index (PWFI) value rises to 24 by 2040. Furthermore, the absence of technological initiatives is responsible for the logarithmic rise of non-recyclable plastic waste to 1.35*1000=1350 tons. Finally, two consecutive policy scenarios with baseline factors such as controlled riverine discharge, increased collection and separation of plastic waste, expansion of recycle business, and locally achievable plastic conversion technologies have been simulated. Therefore, policy 2, with 69% conversion, 80% source separation, and 50% riverine discharge reduction of MSPW, has been found adequate from a sustainability perspective with the lowest PWFI ranges of 3.97 to 1.07 alongside a per-capita MSPW generation of 7.63 to 10 kg from 2023 till 2040.Graphical abstract

Rheological insights into the degradation behavior of PP/HDPE blends

The (re-)processing and degradation behavior of polypropylene (PP) blends with high-density polyethylene (HDPE) is a crucial topic in mechanical recycling due to the prevalence of PP/HDPE mixtures. In particular, small amounts of cross-contamination (below 10.0 wt.%) between these polyolefins are quite common. While much empirical data is available, systematic studies on such blends are scarce and rarely account for the polymers’ chain structure. This study employs time-resolved rheology, atomic force microscopy (AFM), differential scanning calorimetry (DSC) and chemiluminescence techniques to study the degradation of different PP types containing 0.5 to 10.0 wt.% of HDPE. It is observed that the addition of small amounts of HDPE can result in a prominent change in the viscoelastic properties of PP during the thermo-oxidative degradation. The substantial evolution of elasticity in the blends is mainly related to the gelation of fine PE particles dispersed within the PP matrix. It is also shown that a smaller viscosity ratio between the blend components can lead to a more significant degradation through morphology alterations. Remarkably, time-resolved rheology studies revealed that even a small amount of HDPE (2.5 wt.%) can lead to a reduction in the thermo-oxidative stability of the PP/HDPE blend through excessive branching/crosslinking of the HDPE phase. This effect was particularly more pronounced when the PP contained an ethylene comonomer in its backbone. The finer morphology of PE particles in PP copolymer can exacerbate the thermo-oxidative stability of the blend. These insights are essential in designing new life cycles for recycled PP cross-contaminated with HDPE, typically found in the light fraction of municipal solid plastic waste.

Algorithm for solving one of the tasks of the closed-loop economies – how to return municipal solid waste made of plastic to production

The article deals with the analysis of data published by the Federal Service for State Statistics (Rosstat) regarding the whole Russia and regarding Moscow and presented in the form of the federal statistical observation No. 2-TP (waste) “Information on the formation, processing, utilization, neutralization, disposal of waste production and consumption”. The results of the analysis of the data adduced in the Rosstat report show that the situation with the separate waste collection, its processing and sorting for further utilization including recycling cannot be called satisfactory in Russia and its capital city. The author chooses Moscow to study the reasons and improve the situation. This is caused by the fact that the Rosstat data depict the average picture for the country as the nature conditions, the specificities of the people’s habitation and, consequently, the state of management of solid municipal waste in different regions of the country vary greatly and depend on the peculiar feature of each region. The author of the article studies the ways of solving the existing in the capital city problems connected with the need for improving the situation in the management of municipal solid waste. The most difficult segment from the viewpoint of growing volumes of waste disposal is non-rotting solid municipal waste, plastics, which are classified into two categories: recyclable and non-recyclable plastic waste. This segment has been chosen for the author’s study. Within the recyclable category the polyethylene packaging (PET containers) is identified as the most voluminous when collecting waste and as quite suitable for recycling among plastic solid municipal waste. The author calculates the proportion of PET containers in the generated municipal solid waste, indicates economic and environmental efficiency of packaging recycling and its return to production, and suggests optimal ways of collecting and delivering waste for recycling. The results obtained during the study has become the basis for developing the algorithm for the return to the production of municipal solid waste in PET containers.

Mass yields of products and composition of syngas from pyrolysis of Brazilian plastic solid wastes: Combustion simulation and burner design to minimize COx and CxHy emissions

For the first time, the mass yields of products and the composition of synthesis gas (syngas) from pyrolysis of Brazilian plastic solid waste were evaluated for a reactor processing 20 g of plastic at 800 °C. Combustion of the syngas was simulated, evaluating the levels of COx and CxHy emissions, and a burner was designed to minimize emissions during combustion. The main findings highlighted the importance of performing thermogravimetric analyses of waste materials. Higher thermal degradation temperatures (530–900 °C) were obtained for all the plastics, compared to values reported in the literature (300–600 °C). Between 46.7 and 98.0 wt% of syngas was produced, with lower heating values ranging from 10390 to 45684 kJ kg−1, due to differences between the plastics in the fractions of inorganic and hydrocarbon gases produced. The maximum temperatures for syngas combustion, simulated using ANSYS software, were 2000 and 800 °C inside the burner and combustion chamber, respectively. In the burner, higher COx and CxHy levels were related to the syngas composition and incomplete chemical reactions in the flame zone. The CO and CxHy levels decreased towards the combustion chamber, where CO2 was less than 8 wt%, in compliance with the CONAMA 316/2002 regulation.

Plastic Solid Waste Management Assessment Among Selected Schools in Gwadabawa Local Government, Sokoto, Nigeria

The objective of this work was to assess the plastic solid waste management among selected schools in Gwadabawa Local Government, Sokoto, Nigeria. A descriptive survey (cross-sectional) study was employed and collected data from portions of schools and respondents. The findings indicate that, demographic characteristics of teacher respondents involved in this study are: Males are 66.7%, females are 33.3%; and the levels of education include, NCE/diploma (58.0%), BSc (26.7%), MSc (13.3%), and PhD (2.0%). Regards to students involved, 48.0% are males, 60.0% are females; 36.0% are 18-20 years old, and 64.0% are above 20 years old. The level of education of students include, 60.0% diploma students, and 40.0% certificates students. The effects are listed in the order of frequency as submitted by participants: Release of gases (20.5%), land pollution (17.0%), water pollution (15.0%), attraction of vermin (11.0%), breeding of diseases (10.5%), loss of biodiversity (7.5%), reduction of beauty of environment (7.5%), offensive odour (5.0%), flooding (5.0%), and particulates release (1.0%). Methods of waste elimination are: open disposal occurs among 37.5% schools; likewise, open disposal and burning, occur in 37.5%; while, use as fertilizer was recorded in 12.5% schools. Waste collection methods are either open dumping (80.0%), or use of containers (20.0%). The use of segregation of waste; therewith, only 20.0% practice segregation, the remaining 80.0% do not practice segregation, rather openly display mixtures of waste materials. The possible remedies to mitigate plastic solid waste mismanagement and effects include, education (awareness) and behavior change (53.3%) was mostly stated, funding (26.7%), improvisation (15.3%), scavenging (3.3%), and innovations (1.3%). Policy makers need to act urgently in diverse ways, and the people are supposed to be educated on ways of remediating plastic waste pollution.

Plastic Solid Waste Management Assessment Among Selected Schools in Gwadabawa Local Government, Sokoto, Nigeria

The objective of this work was to assess the plastic solid waste management among selected schools in Gwadabawa Local Government, Sokoto, Nigeria. A descriptive survey (cross-sectional) study was employed and collected data from portions of schools and respondents. The findings indicate that, demographic characteristics of teacher respondents involved in this study are: Males are 66.7%, females are 33.3%; and the levels of education include, NCE/diploma (58.0%), BSc (26.7%), MSc (13.3%), and PhD (2.0%). Regards to students involved, 48.0% are males, 60.0% are females; 36.0% are 18-20 years old, and 64.0% are above 20 years old. The level of education of students include, 60.0% diploma students, and 40.0% certificates students. The effects are listed in the order of frequency as submitted by participants: Release of gases (20.5%), land pollution (17.0%), water pollution (15.0%), attraction of vermin (11.0%), breeding of diseases (10.5%), loss of biodiversity (7.5%), reduction of beauty of environment (7.5%), offensive odour (5.0%), flooding (5.0%), and particulates release (1.0%). Methods of waste elimination are: open disposal occurs among 37.5% schools; likewise, open disposal and burning, occur in 37.5%; while, use as fertilizer was recorded in 12.5% schools. Waste collection methods are either open dumping (80.0%), or use of containers (20.0%). The use of segregation of waste; therewith, only 20.0% practice segregation, the remaining 80.0% do not practice segregation, rather openly display mixtures of waste materials. The possible remedies to mitigate plastic solid waste mismanagement and effects include, education (awareness) and behavior change (53.3%) was mostly stated, funding (26.7%), improvisation (15.3%), scavenging (3.3%), and innovations (1.3%). Policy makers need to act urgently in diverse ways, and the people are supposed to be educated on ways of remediating plastic waste pollution.

Plastic solid waste management strategies: An overview of implications on environment and health

Plastic solid waste management strategies: An overview of implications on environment and health

Two-stage thermal pyrolysis of plastic solid waste: Set-up and operative conditions investigation for gaseous fuel production

In response to the escalating global challenge of mounting plastic waste and the imperative to adopt more sustainable practices for resource utilization, our study focuses on the utilization of plastic solid waste (PSW) through a two-stage thermal pyrolysis process. This aims to demonstrate its potential as a high-performance alternative to existing two-stage catalytic pyrolysis methods. The experimentation involved processing real scrap PSW material in a lab-scale batch set-up, emphasizing optimizing residence time in the cracking reactor to maximize gas yield and its lower heating value (LHV). The study underscores the advantages of the employed two-stage thermal pyrolysis apparatus through a comparative analysis with established set-up dedicated to maximizing gas yield. Once the operative conditions were explored, resulting pyrolysis products underwent detailed characterization to assess their suitability as a sustainable fuel source. The study also presents a practical application of the produced gaseous fuel, envisioning its combustion in an internal combustion engine (ICE), known for its flexibility regarding fuel properties. This application is demonstrated through a simulation conducted in Unisim Design©. The successful processing of real PSW material in the two-stage lab-scale experimental set-up showcased optimal gas yield achievements (>65 % w/w) with an LHV (∼41 MJ/kg), comparable to that of natural gas. This emphasizes the potential of these sustainable alternatives to replace fossil fuels, especially in the context of ICE applications. The integration of the pyrolysis plant with an ICE demonstrated promising prospects for generating electricity in the transportation sector and facilitating thermal power for heat integration in pyrolysis reactors.

Novel cold pothole patching mixtures utilizing EAF steel slag and pyro-oil from municipal plastic solid waste

Novel cold pothole patching mixtures utilizing EAF steel slag and pyro-oil from municipal plastic solid waste

Upcycling of plastic waste to atomic nickel site-decorated carbon for efficient electrochemical CO2 conversion

We recycle solid plastic waste to valorize gaseous CO2 waste, demonstrating a sustainable strategy to address the environmental problems of plastic pollution and climate change simultaneously.

Green and Sustainable Pyrolysis: Conversion of Plastic Solid Waste into Liquid Fuel

Excessive use of fossil fuel like gasoline and increasing number of automobiles has led to extensive scientific research in the field of alternative fuel sources. Also due to the vast range of uses of plastics across many industries, Plastic Waste in landfills and global production of plastic increased over time. The conversion of Waste plastic into liquid and gaseous fuels and value-added chemicals by pyrolysis followed by fractional distillation is explained as a practical and sustainable solution for recycling plastics because the calorific value of plastic is almost identical to that of hydrocarbon fuel. This research work is focused on converting high density plastic into liquid fuel by pyrolysis at temperature 200-400℃. The obtained liquid fuel was subjected to distillation at different temperature ranges. The density and viscosity of distilled sample was measured and was found to be close to that of petrol.