Alternative Solutions for Rejected Waste.
The main drawback of incineration as an alternative solution to land filling for rejected waste is the dangerous and toxic flue gas that is released during this procedure, which harms human beings, as well as the environment. This flue gas is rich in acid gases that are also green house gases, which increases the progression of global warming, and endangers trees, mountains, and buildings made from cement by eroding them. This report mainly took into consideration the treatment of the flue gas exiting an incineration process, by using a gas-liquid absorption column to extract the gases mentioned before from the flue gas. The column required for this specific process was found to be 10 m long, and has a diameter of 1 m. This column is characterized with 11 stages and releases air at the outlet complying with the general environmental requirements for released air from a process. It is also packed with 2 in. Intalox saddles to improve the contact between the gas and liquid and operates at 77% flooding conditions to ensure maximum transfer. The amount of water required to treat 0.37 kg/s of gas with 0.0801 (mol pollutants /mol air) is 38.92 kg/s. The air exits with a composition of 0.0033 (mol pollutants/mol air). This column is operated at ambient temperature (25°C), and a pressure of 10 atm. This report also includes a brief economic study, in which the column and its packing were priced to find the capital cost of the absorption column, which was equal to about $42,113.43.
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