Waste

Planning the proper management of waste and considering its harmful effects on the environment in each country is one of the important principles to provide long - term benefits and move on the path of sustainable development. In this regard, waste management is considered as one of the major axes of development in rural areas. Due to the importance of the problem, the present descriptive-analytical study was conducted to identify the factors affecting rural waste management in Shirin Dareh village, Quchan city. The statistical population of this study includes the heads of rural households of Shirin Darreh village (3560) in which 347 were selected applying Cochran formula. The method of Attributive-Survey was applied to collect data. A documentary method is used to examine the record and explain the problem. Furthermore, a survey method was used to collect the data by observation, interview and completion of the questionnaire among the residents. The data were also analyzed using SPSS and LISREL software packages. Exploratory factor analysis was used in order to identify the factors associated with the structure “factor affecting of Rural Waste Management in Shirin Dareh Village”. Besides, confirmatory factor analysis was used to investigate the goodness of fit index of the research model. The results of exploratory factor analysis indicated that ten factors of ultimate disposal management, education and information, cultural, health, knowledge and awareness, inter-sectoral, financial, executive organization, planned and social programs, explains approximately 67.51% of total variance of waste management factors affecting rural areas of Shirin Darreh. The findings of confirmatory factor analysis also showed that those ten mentioned factors, to a large extent, measure the independent and discrete dimensions of "waste management factors affecting" within the study area.

Discarded cigarette butts are a form of non-biodegradable litter. Carried as runoff from streets to drains, to rivers, and ultimately to the ocean and its beaches, cigarette filters are the single most collected item in international beach cleanups each year.

M aking informed and justifiable decisions is the essential beginning to any successful development project. However, critical steps must be taken to help ensure that the decisions made will achieve the desired results. These steps rely on systematic processes and tools-collectively known as "needs assessment"-that help decision makers resist the temptation to select solutions before results have been clearly identified and defined.

District heating networks are commonly addressed in the literature as one of the most effective solutions for decreasing the greenhouse gas emissions from the building sector. These systems require high investments which are returned through the heat sales. Due to the changed climate conditions and building renovation policies, heat demand in the future could decrease, prolonging the investment return period. The main scope of this paper is to assess the feasibility of using the heat demand – outdoor temperature function for heat demand forecast. The district of Alvalade, located in Lisbon (Portugal), was used as a case study. The district is consisted of 665 buildings that vary in both construction period and typology. Three weather scenarios (low, medium, high) and three district renovation scenarios were developed (shallow, intermediate, deep). To estimate the error, obtained heat demand values were compared with results from a dynamic heat demand model, previously developed and validated by the authors. The results showed that when only weather change is considered, the margin of error could be acceptable for some applications (the error in annual demand was lower than 20% for all weather scenarios considered). However, after introducing renovation scenarios, the error value increased up to 59.5% (depending on the weather and renovation scenarios combination considered). The value of slope coefficient increased on average within the range of 3.8% up to 8% per decade, that corresponds to the decrease in the number of heating hours of 22-139h during the heating season (depending on the combination of weather and renovation scenarios considered). On the other hand, function intercept increased for 7.8-12.7% per decade (depending on the coupled scenarios). The values suggested could be used to modify the function parameters for the scenarios considered, and improve the accuracy of heat demand estimations. Abstract This study aims to examine the economic and environmental benefits of recovered paper and potential contribution of the recovered paper to the Kingdom of Saudi Arabia (KSA) Vision 2030. The Vision 2030 is an inclusive development policy, recently launched, with the objectives to build the best future for the country. The Vision 2030 is based on three ambitious goals: making the country a vibrant society, a thriving economy and an ambitious nation. It is estimated that by 2030, 5.05 million ton of waste paper would be recovered in the country. About 11.3 billion SAR (US $3.01 billion) would be added to the country's GDP and would create about 16,536 new jobs if the recovered paper industry is built in the country. Moreover, a net environmental benefit of 9.6 million crude barrel oil savings and 4.5 million ton of CO2 savings from GHG emissions could be achieved by 2030 only from the paper waste recovery in the country. The potential benefits of paper waste recycling in KSA highlight the needs of effective measures to optimize the economic and environmental opportunities inherited in the waste paper industry. These measures should focus on capitalizing the local waste paper processing industry, restrict the export of raw waste paper materials, and enhance the waste paper collection process and quantity.

Addressing the contemporary waste management is seeing a shift towards energy production while managing waste sustainably. Consequently, waste treatment through gasification is slowly taking over the waste incineration with multiple benefits, including simultaneous waste management and energy production while reducing landfill volumes and displacing conventional fossil fuels. Only in the UK, there are around 14 commercial plants built to operate on gasification technology. These include fixed bed and fluidized bed gasification reactors. Ultra-clean tar free gasification of waste is now the best available technique and has experienced a significant shift from two-stage gasification and combustion towards a one-stage system for gasification and syngas cleaning. Nowadays in gasification sector, more companies are developing commercial plants with tar cracking and syngas cleaning. Moreover, gasification can be a practical scheme when applying ultra-clean syngas for a gas turbine with heat recovery by steam cycle for district heating and cooling (DHC) systems. This chapter aims to examine the recent trends in gasification-based waste-to-energy technologies. Furthermore, types of gasification technologies, their challenges and future perspectives in various applications are highlighted in detail.