Identifying the influence of adding plastic and paper waste on stabilization of subgrade for toll roads

Plastic waste is a serious problem for the survival of all creatures on Earth. Recycling is one solution to reduce the negative impact of environmental pollution caused by plastic waste. A lot of plastic waste that pollutes the Earth comes from plastic bottle waste (PET). There had been many studies that discussed the use of plastic bottle waste (PET); however, this research used the plastic bottle waste (PET) as a geocell for subgrade reinforcement. To this date, the use of plastic bottle waste as geocell is still rare. The main purpose of this study was to determine the effect of adding geocell of plastic bottle waste on the subgrade using a capping layer that had a low bearing capacity. This research was expected to reduce the impact of environmental pollution due to plastic bottle waste, and be an alternative solution for additional reinforcement in the capping layer. Therefore, it could increase the ultimate bearing capacity and reduce the thickness of the cover layer on subgrades that had a CBR value below 5%. The results of the analysis using the Plaxis program showed that the geocell from plastic bottle waste could be used to save the use of capping layer materials by up to 65%.

Catalytic processing of plastic waste on the rise

Since plastic and food waste are both types of non-lignocellulosic biomass, these must be handled and managed correctly to avoid pollution problems and damage to the environment. Bio-oil, made from recycled materials, including plastic and food waste, is one focus of these attempts. The co-pyrolysis method is being investigated in this study as a technique of recycling plastic waste and food waste to produce biofuels with reduced environmental impact. In terms of energy efficiency, bio-oil is unequal to other fuels like coal or natural gas because of its high acidity, high oxygen content, and low thermal stability. Therefore, a vacuum distillation process is required to improve bio-oil quality by adjusting the distillation temperature from 300 to 350 OC and the percentage of plastic waste used from 30 to 50%. The bio-oil was analyzed using a Gas Chromatography-Mass Spectrometer (GC-MS). The general compound showed that acids (60%) and alcohols (20%) were the most prevalent chemical compounds, followed by phenol (4%), aldehyde (14%), aliphatic (5%), Furan (14%), and ketones (11%) at maximum temperature (350 oC) for 30-50% plastic waste. Meanwhile, the final product is affected by temperature and plastic waste (PET) ratio factors. At 350 °C and a plastic waste addition of 50%, the highest bio-oil yield is 45%.

The problem in this research is the increasing amount of plastic waste that is difficult to decompose creates an idea for me to use as one of the additives or mixtures in making asphalt mixtures. The types of plastic waste that are mostly found are drink bottles and plastic bags. This type of plastic can only be recycled only once with the name PET (Polyethylene Terephthalate). The addition of plastic to the asphalt mixture aims to optimize the characteristics of the AC-WC smooth asphalt mixture and reduce the amount of waste. Plastic mixing is carried out by means of a dry method whose plastic content is 5%, 10% 15% and 30% of the weight of optimum asphalt content. From the Marshall test conducted with the addition of PET plastic waste, the Stability value at 5% was 2005,967 kg, compared to the absence of additional plastic waste with a record number of 1961,534 kg. Density value with the addition of plastic at 5% level was 2.355% decreased compared to the elimination of the addition of this plastic mixture with a value of 2.359%. The value of Flow with the addition of plastic at a 5% level of 3,200% has increased compared to without the addition of plastic with a value of 3,100%. The value of VIM with the addition of plastic at a level of 5% is 4.453% compared without the addition of this element from the plastic waste that is difficult to decompose with a value of 4.297%. VFA value with the addition of plastics at 5% level was 73.493% decreased compared to no plastic additions amounting to 74.216%. The VMA value with the addition of plastic at 5% level was 16,801%, an increase compared to without the addition of plastic with a magnitude of 16,665%. MQ value with the addition of plastic at 5% content of 626,865 kg / mm has decreased compared to without the addition of plastic 632,753 kg / mm.

In recent years, concrete in the construction industry has rapidly increased worldwide, including developing countries like India. The raw materials required to produce such a quantity require huge depletion of natural resources. On the other hand, disposal of paper waste, fly ash, and plastic waste is one of the biggest problems faced by many countries, including India, the amount of waste collected and recycled is less compared to disposal quantity. The use of these wastes in concrete reduces the disposal of waste in nature. In this experiment work, the use of these wastes in the concrete has been studied. Preliminary tests like specific gravity, fineness modulus, and water absorption have been carried out on the materials. Various mix designs are prepared by partial replacement of cement with fly ash and paper pulp, and sand is completely replaced with the quarry dust, and coarse aggregate is replaced with shredded plastic waste to create sustainable concrete. A comparative study on the properties like slump cone, the weight of the cubes, compressive strength and split tensile strength, and feasibility of such concrete has been carried out. Results indicated that the weight of cubes started to decrease with the addition of waste. Compressive strength and split tensile strength show that the strength started to fall with the addition of plastic. The cost of concrete decreased with the addition of waste. 5 % of plastic waste in concrete and 3 % of paper pulp, and 5 % of fly ash is considered the optimal replacement percentage.

There are many types of waste, including organic or household waste, plastic waste, and paper waste. Sometimes, even rarely among us, we can manage waste that has economic value. Analysis of the problem situation faced by Gelogor Village, namely that there is no orderly sorting of organic, paper, and plastic waste, they do not understand waste management procedures, the products made still need to have a brand, and difficulties in marketing the products. The aim of this service is to provide training related to waste management that can have economic value in Gelogor Village. The Participatory Action Research (PAR) method was implemented and implemented in three stages: planning, implementation, assessment, and monitoring. The method used is to conduct a field survey first, followed by coordinating the implementation of the service, distributing invitations to the community, preparing a schedule of service activities, and the core activity, namely conducting training. The results of this service research are that Gelogor residents are very enthusiastic about waste management, this can be seen from the various questions asked by the Gelogor Village community. There is great hope for the role of village officials to provide support related to waste management, such as the trash basket in each local resident's house consisting of three trash cans.

The reuse and recycling rates for plastics are still below desirable values. The valorisation of plastic wastes that presently end in landfills or is incinerated can help to mitigate this environmental problem. There have been studies in soil improvement using plastic waste. Two types of plastic waste were used to assess their ability to improve soil properties for embankment construction and pavement layers. The selected plastic wastes are made from shredded package labels and ground bottles. The main properties of the soils were characterized. Three percentages of plastic waste were used, and the bearing capacity of the soil determined using CBR test (California Bearing Ratio). The results from the tests show that plastic waste stabilization leads to an increase in bearing capacity, expressed in CBR values, for low contents of plastic waste. This increase was more effective for high penetration values. Reduction in the bearing capacity was observed for higher plastic waste contents. Maximum dry unit weight decreased with increasing plastic waste content, whereas expansion increased with increasing plastic waste content.
 Keywords: Soil stabilization, Plastic waste, CBR test, Compaction, Earthworks

Catalytic conversion of biomass and plastic waste to alternative aviation fuels: A review

Solid waste management has become one of the most important issues in urban centres of developing countries where population growth puts pressure on public services. Nepal is struggling to manage municipal solid waste in urban centres due to a lack of segregation at the source, recycling, and proper disposal. This chapter examines whether women and men manage household waste differently at the household level, especially at source segregation, managing recyclable waste (paper and plastic), and composting degradable waste. Using household survey data from the Bharatpur Metropolitan City of Nepal, we find that women are more likely to segregate waste at the source and also manage degradable waste at home better. Still, there is no gender difference in selling plastic and paper waste. In contrast, women are more likely to give paper or plastic waste either to the waste collectors (free) or throw away, suggesting a heterogeneity across gender when it comes to managing household waste. In most cases, women waste managers perform well (segregating at source and composting degradable waste), but they do not seem to do well in all areas of plastic or paper waste management where some sort of sensitization may be helpful.

The use of plastic has become an important and inseparable part of people's daily lives, but rapid population growth and increasing human activities produce significant amounts of plastic waste. This research aims to reduce pollution caused by plastic waste, utilize plastic waste as a source of renewable energy in the form of Fuel Oil (BBM), and analyze the ratio of waste types to the quantity of fuel produced. In this research, data was collected from various commonly found waste, such as plastic bag waste, plastic bottle waste and styrofoam waste. Then, to produce fuel, a pyrolysis process is carried out with a waste mass of 1:1:1. Based on the results obtained, plastic bottle waste produces a product in the form of 0.019kg/30 ml kerosene. Furthermore, plastic bag waste produces 0.05kg/50 ml kerosene products, as well as 2.5 ml petrol oil. And styrofoam waste produces products similar to plastic bag waste, namely kerosene 0.171kg/98 ml, and petrol oil 2.5 ml. Based on the data obtained, Styrofoam waste produces more kerosene products compared to plastic bag and plastic bottle waste. With this research, we hope that society can maximize plastic waste into economic income and reduce environmental pollution caused by plastic waste.

Plastic waste is a type of inorganic waste that does not decompose easily and thus pollutes the environment, causing water, soil, and air pollution that endangers human health. The objective of this study is to describe how to utilize plastic waste as a planting container for wick system hydroponics that carries economic value. This study employed a qualitative descriptive method using a literature review approach. To implement wick system hydroponics using plastic waste as planting containers, the required materials include plant seeds, rockwool, cocopeat or burnt husks, styrofoam or trays for seeding, waste fabric or similar materials as a wick connecting the plant to the nutrient solution, and waste such as styrofoam, mica, or plastic bottles for the nutrient reservoir, along with plastic cup waste as netpot containers. The utilization of plastic waste as hydroponic planting containers not only offers a solution to plastic waste issues but also provides an alternative for land and cost efficiency in promoting food security and health, which are part of the global sustainability agenda.

The type of plastic waste that is often a problem in many cities in Indonesia is Polyethylene Terephthalate (PET), his is due to the plastic waste plastic waste bags has no longer economic value. One of the goals of plastic waste processing is usng it as a raw material for the Waste Garbage Power Plant (PLTSa). The most profitable in handling plastic waste by converting plastic waste into fuel oil as an alternative energy source because plastic is basically derived from petroleum. Plastic also has a fairly high heating value equivalent to gasoline and diesel fuel. Some studies related to plastic processing have not been integrated from the production process to downstream products in the form of electric products to get the overall level of plant efficiency. Therefore a research of plastic waste power plants needs to be done at the prototype level to determine the performance of the fuel and the level of efficiency of the resulting assemblers. The Pyrolysis Reactor Prototype Unit can be used to convert plastic bottle waste into liquid fuel with a yield of 56.26% carried out at a process temperature of 170 oC and the resulting heating value reaches 19644 Btu/lb close to the heating value of Pertamina Gasoline. The generator system performance test for the liquid fuel mixture (BBC) with Gasoline and Diesel has an optimal mixture ratio in the BBC - Bensi / Solar mixture 3: 2 with an optimal load of 800 Watt. In the generator system performance test for liquid fuel mixture (BBC) with Gasoline/Diesel is more optimal for comparison of BBC fuel with Gasoline, because for the BBC mixture with Gasoline in all generator system comparison values occur ignition. Whereas BBC with Solar does not ignite at a ratio of 0: 5, 1: 4 and 2: 3.

Nowadays, the research for innovative approaches to and practices for plastic waste in a circular economy has acquired a big attention. Plastic waste causes a serious environmental pollution concern. Meantime, the cement industry is one of the biggest sources of carbon monoxide and carbon dioxide emissions, which is considered as another environmental challenge to change of climate. All those and others side effects of plastic waste, make the plastic sand glass bricks an attractive alternative material to construction. In this paper, the plastic and glass waste were used at different percentage for replacing cement as a binder to produce non-traditional concretes. The literature review reveals that there is a deficiency of studies that manage the plastic sand glass as a construction material from economic perspective. Plastic sand glass bricks prepared could be a workable solution for combating issues related to solid waste. The results showed that the compressive strength decreased with increasing ratios of plastic to sand. On another hand, it is increased with increasing of sand ratio. Plastic brick prepared poses a density less than the conventional bricks, and acceptable hardness. Low water absorption also reflected that the plastic brick could be used in the construction. TGA and DSC analysis showed that the plastic brick prepared has a good thermal stability and the decomposition is in the limited and acceptable range. Optimization of the two effective variables (plastic/sand and galas ratios) has been made and correlating the results obtained using Box-Wilson statistical method to create a model for describing the predictable properties of a new product.

This paper studies the effect of compaction temperatures on Marshall properties on a Hot Rolled Sheet-Base (HRS-Base) mixture with the addition of plastic waste. Polyethylene terephthalate (PET) type plastic waste from plastic bottle waste is used in this study as an additional material of HRS-Base mixture. The ‘wet method’ is used to mix the PET into HRS-Base mixture, in which the PET is pre-mixed with asphalt material at the temperatures between 160 °C to 170 °C to create modified asphalt before it is mixed with HRS-Base aggregates. The materials used in this study consist of PET from plastic bottle waste, 60/70 penetration asphalt, Portland cement, and aggregates. The aggregate composition used must meet HRS-Base specifications based on the Indonesian National Standard (SNI). The results showed that increasing the compaction temperature of the HRS-Base mixture had an impact on increasing density, Voids Filled with Asphalt (VFA), Marshall stability, and Marshall Quotient (MQ), while the values of Voids in Mix (VIM), Voids in Mineral Aggregates (VMA), and Flow decreased. In addition, HRS-Base without the addition of PET plastic (conventional HRS-Base) and HRS-Base with the addition of PET plastic (modified HRS-Base) were compared. Conventional HRS-Base has a density value, Voids Filled with Asphalt (VFA), and Flow higher than those of modified HRS-Base. While, the value of Voids in Mix (VIM), Voids in Mineral Aggregates (VMA), and Marshall stability of conventional HRS-Base are lower than those of modified HRS-Base.

This research sought to critically appraise current waste management practices at Capiz State University Sigma Satellite College. The objectives included identifying the main sources and types of waste, assessing current management practices, and addressing challenges in effective waste handling. It also proposed strategies for waste reduction and recycling, aligning with Sustainable Development Goal (SDG) 11 on sustainable cities and communities. Data collection methods included waste audits and surveys conducted from August 8, 2022, to January 8, 2023. Waste audits involved sorting, weighing, and categorizing waste across campus areas, while surveys gathered information from students, faculty, and staff about waste sources, behaviors, and attitudes. Descriptive statistics were used to analyze trends, revealing classrooms as the primary waste sources, generating significant amounts of paper, plastic, and food waste. Other contributors included the canteen, restrooms, and offices. Current waste management practices involved segregation, recycling, composting, and landfill disposal, but challenges included low participation, limited recycling infrastructure, and inadequate funding. Food and plastic waste were identified as critical issues, requiring immediate attention. CAPSU Sigma Satellite College faces significant waste management challenges, primarily a lack of awareness and participation among its community members. Inadequate infrastructure, financial limitations, and restricted space further hinder effective waste handling. Addressing these issues requires improved education, enhanced infrastructure, diversified funding, optimized space utilization, and stronger collaboration with external partners. The study recommends targeted waste education and awareness campaigns, improved recycling infrastructure, and enhanced waste reduction initiatives. Addressing these challenges will promote campus sustainability, aligning with the global goals of SDG 11.