1,721,333 research outputs found
A comparative examination of MBR and SBR performance for the treatment of high-strength landfill leachate
No full textThe management of landfill leachate is challenging, with relatively limited work targeting high-strength leachate. In this study, the performance of the membrane bioreactor (MBR) and sequencing batch reactor (SBR) technologies are compared in treating high-strength landfill leachate. The MBR exhibited a superior performance with removal efficiencies exceeding 95percent for BOD5, TN, and NH3 and an improvement on SBR efficiencies ranging between 21 and 34percent. The coupled experimental results contribute in filling a gap toward improving the management of high-strength landfill leachate and providing comparative guidelines or selection criteria and limitations for MBR and SBR applications. While the sequencing batch reactor (SBR) technology offers some flexibility in terms of cycle time and sequence, its performance is constrained when considering landfill leachate associated with significant variations in quality and quantity. Combining membrane separation and biodegradation processes or the membrane bioreactor (MBR) technology improved removal efficiencies significantly. In the context of leachate management using the MBR technology, more efforts have targeted low-strength leachate with limited attempts at moderate to high strength leachate. In this study, the SBR and MBR technologies were tested under different operating conditions to compare and evaluate their feasibility for the management of high-strength leachate from a full-scale operating landfill. 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Water Quality in the Coastal Zone of Bebnine: A Case Study on Successful Community Participation
No full textSimulating temperature variations in landfills
No full textGas generation within solid waste landfills occurs as a result of biodegradation of organic matter in the landfill. Biodegradation processes in a landfill are exothermic and highly dependant on microbial growth in that environment. The heat generated during exothermic reaction's increases landfill temperatures. Temperature is an important factor controlling their own internal temperature. Therefore predicting and controlling the temperature variation within a landfill are essential to ensure normal gas generation and recovery and enhance stabilization processes. This paper presents a mathematical model to estimated the temperature distribution resulting from the heat release during organic waste decomposition in layered solid waste landfills. The heat source within the landfill is estimated based on the amount of heat generated during the biodegradation processes. Temperature profiles are obtained by solving the heat flow equation within the landfill. The resulting model is coupled with a gas generation and transport component and was used to simulated data from a field scale test
Environmental compliance and phasing program for paper and cardboard manufacturing in Lebanon
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Needs assessment for an integrated air quality monitoring program in the three main cities of Iraq (Baghdad, Basra, and Mosul)
No full textNoise impact assessment of multi-highways in urban areas: Model calibration and mitigation measures
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