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• W2187456309 abstract "Solid waste disposal to landfills is an important technique in waste management, but the treatment of the leachate that is collected represents one of the major problems. This paper presents a simulation study on the leachate treatment that was conducted using STOAT, a dynamic sewage treatment works modelling package. Two biological nutrient removal treatment schemes were evaluated: nitrogen removal only (AO scheme) and the Bardenpho process (nitrogen and phosphate removal). The results have shown that AO scheme works better than Bardenpho, because the landfill leachate contains little phosphorus and the treatment process should be focused on removing BOD and ammoniacal nitrogen. Introduction. Leachate treatment and disposal is one of the major problems for solid waste landfill management. The landfill leachate usually results from the rainwater that percolates through the landfill and absorbs chemical and biological compounds and from the liquid resulted from the decomposition of the wastes. Thus, the leachate is highly loaded with many organic compounds, some of them not readily biodegradable and toxic heavy metal compounds. The composition of the leachate varies greatly depending on the age of landfill. Furthermore the flow value changes with the weather. As a result of the variability in leachate characteristics, the design of a leachate treatment system is a complicated process. There are currently in use biological, physico-chemical and advanced methods to treat leachate. Renout et al (2008), presented a review of leachate treatment technologies with their advantages and drawbacks and pointed the major criteria to select a suitable treatment strategy. Madu (n.d.), searched for and compared leachate treatment methods in terms of efficiency in the treatment of young, medium and old leachate as well as in term of space utilization, skilled personnel requirement, installation and operational cost. He found twenty different principle techniques for treatment of landfill leachate. Anaerobic biological leachate treatment is not a successful technology because of the high required COD levels and the inability of ammoniacal-N removal. Aerobic biological treatment of leachate is widely used, most of the leachate contaminants being removed, but the remaining values of COD and AOX are still relatively high (Stegmann et al 2005). This was the reason to develop physical-chemical treatment steps as an alternative or as additional treatment methods. From these biological treatment systems of leachate, good results were obtained using Sequencing Batch Reactor (SBR) technology (Carville & Robinson 2005; www.gov.uk), that is well suited to the higher organic strength and concentrations of ammoniacal-N in landfill leachates. This technology is applied tank based or lagoon based. Also MBR and attached growth systems have proved good results in removing contaminants from leachate. Coban et al (2012) present a method for the removal of organic material using aerobic/anoxic MBR system followed by a nanofiltration process. They have shown that nitrogen removal by nitrification/denitrification process is hard, but integrated membrane" @default.
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• W2187456309 date "2014-01-01" @default.
• W2187456309 modified "2023-09-22" @default.
• W2187456309 title "Simulation of solid waste landfill leachate" @default.
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