What is another benefit of using potassium permanganate for oxidizing iron and manganese?

Using potassium permanganate for oxidizing iron and manganese presents several benefits, one of which is the fact that it does not lead to the formation of trihalomethanes (THMs). THMs are a group of chemical compounds that can form when chlorine-based disinfectants react with organic materials in water. This is important because THMs are considered potential health risks and their presence in drinking water must be closely monitored. Therefore, utilizing potassium permanganate as a disinfectant or oxidizer provides a safer alternative, minimizing the risk of creating harmful byproducts, making it especially valuable in water treatment processes.

The other options do not align with the benefits of potassium permanganate in the same context. For instance, while cost-effectiveness may vary depending on the specific circumstances of water treatment, potassium permanganate is often viewed as economical due to its effectiveness in small doses. The statement about reducing pH levels is misleading since potassium permanganate can actually have a neutral to slightly alkaline effect on pH, rather than reducing it. Additionally, its direct impact on flow rate isn't significant in the context of oxidation processes for iron and manganese. Thus, the advantage of not forming THMs is a key reason for choosing potassium permanganate in these oxidation