Papers by Keyword: Solid Waste Management

Abstract: Improper solid waste management in Lima, particularly glass, leads to severe environmental, social, and public health problems. The low recycling rate and waste accumulation contaminate soils and groundwater, impacting long-term quality of life. This research aims to evaluate the inclusion of residual glass powder (RGP) in concrete to enhance the sustainability of concrete design, focusing on San Juan de Lurigancho, where the highest amount of waste per person in Lima is generated. The proposed solution involves developing a waterproof concrete design by incorporating residual glass powder (RGP). This approach includes replacing 5%, 10%, and 15% of the cement in the mix to achieve a strength of 280 kg/cm², thereby reducing pollution from glass waste and CO₂ emissions. Fresh concrete properties were evaluated and found to improve flow and temperature. The slump of fresh concrete increased gradually with the percentage of residual glass powder (RGP), reaching up to 16.5%. Regarding the properties in the hardened state, in terms of strength, replacing 15% of the cement with RGP resulted in a 2.57% increase in compressive strength. The tensile strength at 28 days increased by 21.53% and 16.8% when replacing 10% and 15% of the cement, respectively. However, replacing 15% of the cement resulted in a 0.4% decrease in flexural strength, while a 10% replacement resulted in a 1.44% increase. On the other hand, replacing cement with 15% RGP reduced CO₂ emissions to 53.79 kg/m³. Additionally, a higher percentage of RGP in the concrete allows for cost savings of up to 12.2%, demonstrating a progressive reduction. From the analyses, it was found that the mix including 10% RGP stands out as the optimal option. It shows significant improvements in strength and profitability, reducing production costs by 3.4% and CO₂ emissions by 10.83%. This design achieves an ideal balance between performance, cost, and environmental sustainability.

Abstract: In Malaysia, waste management via recycling is highly promoted, however, recycling bins are not fully utilized as almost all the recycling bins provided are filled with other wastes. As institutional waste is a part of municipal solid waste (MSW), this composition study will be crucial to obtain a conventional management of the waste. In other words, waste composition studies are vital for a more effective and proper management of the waste generated. Hence, the objectives of the research are to analyse the trend of the recycle waste composition obtained during both semester session and semester break and to determine the recycle waste composition collected at UiTM engineering complex. Sorting of the solid wastes from the recycle bins are done manually before weighing of each waste category. The trend shows that paper has the highest composition both during semester session and semester break which is at 65% and 84% respectively followed by plastic bottle with 25% and 13% and aluminum can at 10% and 3%. A sample of recyclable wastes is taken from each recycle bins to the instrumental analysis laboratory for ultimate analysis. The ultimate analysis result shows 43.68% carbon and 1.27% nitrogen for paper wastes, which give a C/N ratio of 34.67. This indicates that paper wastes are compostable when mixed with yard wastes. In determining the economic benefits of recycling, potential revenue of RM78.37 can be obtained from a 10-week period of study and hence, if recycling practice is made compulsory, the revenue can be increased.

Abstract: This research was investigated the solid waste management services and waste collection system of Pathio Subdistrict Municipality, Chumphon province through the application of quantitative research using an information collected from 2011 to 2014. The population density in the year 2011 to 2015 was found 719 to 736 person/km². Solid waste quantities were analyzed through the Lyapunov Exponent (LE) together with predictability method. A number of wastes in each year in this area were quite similar. This research provided the situation of solid wastes management in Pathio subdistrict municipality. Public participation is important for sustainable solid waste management with 3Rs concept were necessary for people practice and reducing the volume of wastes in their daily life for sustainable solid waste management service in this community. For enhancing positive attitudes among the people while conducting activities which targeted on wastes reduction such as waste banks. Moreover, solid wastes management system helped to increase people’s awareness on the importance of sorting waste at source.

Abstract: The current and previous condition of solid waste management programs in the city, Shiraz was studied. Shiraz is one of the capital cities in south of Iran. Different aspects of solid waste programs including collection, transportation, treatments and recycling are discussed. Composition of solid wastes, material analysis, chemical formulation, thermal values, pH and other factors is evaluated. To estimate future conditions an overview of the statistics obtained in previous years is provided. Finally some recommendations are given in case it would be profitable for developing recycling programs in Shiraz city.

Abstract: Poor management of dump-sites creates significant risks to environment and human health. Thus, sanitary landfills are required to be more effective to minimize the impacts of waste disposal. This research assesses the environmental economic evaluation focused on the economically efficiency of Malaysian sanitary landfills. Two landfills were selected based on their different operation. Landfill A incurred RM 128 million (USD 41.8 million) as the total cost within 20 operational period. Thus, it is estimated that the cost may be covered within 15 operational years. On the other hand, the total costs for Landfill B are estimated at RM 198 million (USD 64.8 million) with RM 245 million (USD 80.2 million) are expected to be obtained as profit within eight operational years. Landfill B has high initial costs of design and construction. However, the costs are covered within the first five years. This is because Landfill B introduces a new green technology namely landfill-gas power generator. This indicates that, Landfill B has stronger market competition ability as compared to Landfill A. It can be concluded that the implementation of green technology namely landfill gas harvesting system has higher impact to improve the economic value of a landfill thus making it more economical and environmentally sustainable.

Abstract: Among the multitude of problems existing in the fast urbanizing towns and cities in Nigeria, Solid waste appears to be the most prominent in recent years. Solid waste is seen in huge heaps on any piece of unused land, around buildings and in the open market places. Living with solid waste littered around appears to be an acceptable way of life among the people in most cities in Nigeria in recent years. The work reported in this paper involves a preliminary study of residential solid waste management in the Lagos metropolis in Nigeria. A site-specific study was carried out to estimate the quantity of residential solid waste generation, disposal and management in the metropolis. Structured questionnaires were applied to collect primary information such as size of households, income, Educational level etc. from households. The results obtained indicated that the problem of insufficient available data, insufficient funding, poor understanding of solid waste management by the PSP operators and poor publics attitude are the causes of solid waste crisis in Nigeria. Proposal on strategies for the improvement of the effectiveness of the PSP operators in Lagos metropolis has been presented.

Abstract: Fuzzy-based Solid Waste Management involves the application of fuzzy set theory to formulate a solid waste management algorithm by taking into account a large criterion set and an extensive number of alternatives for various levels of uncertainty in Solid Waste Management. Fuzzy method of solid waste management allows consideration of multicriteria to better manage the inherent uncertainties. The fuzzy-based approach involve determination of solid waste management alternatives, selection of basic criteria, assignment of linguistic variables, construction of membership functions, assignment of membership degree values to each criterion, determination of the best criteria combination for alternatives and the choice of the best alternative. The result shows that alternative 2 has highest degree of membership function to the decision function and therefore is the chosen option.