thermodynamics proposal about (waste water treatment)

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hi I need a proposal in the thermodynamics and the topic need to be about the environmental ( waste water treatment )the topic is about the environmental but you need to show that there is a relationship with the thermodynamics. for example show the uses in thermodynamics to solve this proplem or anything about thermodynamics at this topic (waste water treatment)please any question ask me to make it clear before you start the requirements are in the picture
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