A B S T R A C TThe present study was conducted to monitor the quality of leachate generated from solid waste landfills operated under different mode over a period of 335 days using a bench scale lysimeters. Sixty six kg waste sample reflecting the typical municipal solid waste (MSW) streams generated in Al-Diwaniyah city open dump was used to fill both sanitary and bioreactor lysimeters to study the influence of leachate recirculation on quality of leachate in landfills located in semi-arid areas. Leachate quality is frequently monitored in terms of pH, electrical conductivity (EC), chemical oxygen demand (COD), chloride, and total Kjeldahl nitrogen (TKN). The results show that pH and electrical conductivity values were clearly fluctuated in the rainy season, while in the dry season the values tend to decrease steadily with a close correlation between the chloride and electrical conductivity parameters. The study reveals that bioreactor landfill with leachate recirculation appears to be the most effective option in the removal of organic matter by 98% removal efficiency compared with 58% removal efficiency in a sanitary landfill. The main difference between recirculation and non-recirculation options is determined through leachate quality.
The improvement of engineering properties for surface soils is of significance through the resources shortage. Therefore, the present study focused on determined the silica fume influence as industrial waste products on engineering characteristics of surface available soil as a soft soil with poor engineering properties to enhance the hydraulic properties to be used for landfill lining layer and prevent migration leachate for surrounding environment. Silica fume was added to the soil to enhance the permeability with 5%, 10% weight ratio. Then, Atterberg limits and permeability tests were conducted. The results indicated that silica fume increase the flow and plasticity characteristics of the stabilized soils. Addition of 5% and 10% silica fume to surface soil reduce the permeability up to 46% and 57% respectively.. It was concluded that silica fume filled pore space between soil particles and a dense matrix were formed. This textural event caused an improvement in permeability characteristics which represent the major concern in design MSW lining layer.
a mixed methodlogical approach including qustionnaire survey, field investigation and personal interviews has been adopted for gathering data to obtain Municipal Solid Waste generation rate ,biodegradable waste generation rate and non biodegradable waste. sample were taken from different socioeconomic group(socio-income level). based on the results of the preliminary survey for 99% confidence interval and 10% standard error,46 household was the optimum size of sample, where 644 sample was collected. the research conclude that average generation rate of: biodegradable waste was 0.531 kg/capita.day, non biodegradable waste was 0.151 kg/capita.day, and personal generation rate was 0.68 kg/capita.day. statistically analysis showed a positive relationship between income and non biodegradable waste generation rate in high income group and biodegradable waste generation rate in middle income group. The study revealed a statistically significant difference between non biodegradable waste generation rate in different socioeconomic group while there is no statistically significant difference in biodegradable waste for the same groups.
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