You are studying a reactor that receives a particular reactive contaminant which follows a zero order reaction process (ie. the reaction rate is independent of the concentration of the contaminant). If you assume plug flow, a cross sectional average velocity of 10 cm/sec, and a zero order reaction rate of 0.5 mg/l min, how long should my reactor be such that the concentration is reduced by from 10 mg/L to 1 mg/L? (hint: do a mass balance for the system).

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Landfills

The landfill is a site used for the disposal of waste materials. The landfill is a solid waste facility that is often known as a dumping ground. The image below shows a landfill site in Hawaii. Landfilling is the most ancient and common method used for the disposal of waste. For the landfill, a deep trench is constructed in an isolated place away from the city. The trench for landfills is designed properly after analyzing the total population and the waste generation per capita. The waste is dumped into the trench and after every layer of waste, a layer of soil is spread on the top of it.