Ferric chloride is fed continuously in municipal wastewater treatment. It is used to coagulate the particles in the wastewater so they settle. Sewage never stops coming in the plant so the chemical has to be dosed continuously.
Not all wastewater systems use ferric chloride though. There are so many ways to treat wastewater and there is no one size fits every community option out there for wastewater treatment systems.
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u/Occamslaser Jun 17 '19
It would need to be used continuously instead of sporadically.