Selection of oxidant
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When using the lime-iron salt method to treat heavy metal wastewater, possible oxidants include bleaching powder, potassium permanganate, and compressed air; what is their cost-effectiveness, and how should one choose among them?
That’s right, OP – what exactly do you want to say here? The lime-iron salt method can already be used to treat certain heavy metal wastewater; then what’s the need for oxidants? Not to mention the cost-performance ratio?