The sidebar discussion provides us with a summary of the overall scheme of wastewater treatment covered over the last several hundred pages. At the end of the day, what we are left with is ultimate sludge. If we choose incineration, we still have a solid waste left to deal with, ash. If we choose another route to sludge volume reduction, we still have a solid waste residue to deal with. There is no ultimate destruction of sludge, only ultimate sludge that we are left with. The final engineering solution we need to devise is how to ultimately handle this waste. It simply boils down to whether we select a so-called pollution prevention related technology or a final disposal option for the solid waste. In the remaining sections we will explore the options available to us.
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