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Gas Migration, Emissions and Safety Aspects
Published in T. H. Christensen, R. Cossu, R. Stegmann, Landfilling of Waste: Biogas, 2020
T. H. Christensen, R. Cossu, R. Stegmann
By maintaining a low vacuum below the mineral liner, the oxygen intake and/or the landfill gas migration out of the landfill body can be prevented. This can be achieved by installing a pressure and/or a CH4 control unit into the extracted gas stream. In order to reduce the pressure influence on the mineral liner, the upper section of the wells must be gas-tight.
Investigation on rapid solidification of waste dredged sludge with magnesium phosphate cement modified by GGBFS
Published in European Journal of Environmental and Civil Engineering, 2022
The fluid sludge treated with GGBFS-modified MPC needs to be transported to a landfill. According to the characteristics of the interaction between MPC and sludge, the following systems should also be considered in the landfill to ensure safe disposal. Figure 12 presents conceptual diagram of a large volume of heavy metal-rich sludge solidification and stabilization integrated repository. The repository can be divided into six major subsystems. The sludge was solidified by MPC to release a large amount of ammonia gas, and the SS was rich in solid liquid gas. Sludge was also rich in a small amount of heavy metal pollutants, so stabilizing heavy metals was also very important. The bentonite cushion anti-seepage system was used to prevent the leachate from leaching heavy metals and polluting groundwater. The landfill gas migration monitoring system was designed to collect the ammonia released during the solidification of MPC and the gas produced by bacteria decomposing pollutants. For receiving and storage systems, it is necessary to intelligently identify pollutants in sludge. In order to realize the secondary treatment of leachate, a leachate collection and discharge system for heavy metal pollutants was established. These six systems cooperated with each other, and provide guarantee for the operation of the heavy metal-rich sludge repository through information coupling, disaster factor analysis, monitoring and early warning and risk identification of disaster precursors.