Question

Suggest a process for Fe2+ and Mn2+ removal and where would you place it in the process train and why. Calculate a theoretical need for an oxidant consider Cl and permanganate and discuss pros and cons for each. (2 points)

Answer 1

There are various effective ways to remove Fe2+ and Mn2+, some of them are:

1. Aeration.

2. Chlorination

3. Oxidising Agent like Potassium Permagnate, Ozone.

4. Reverse Osmosis.

The most frequently used method is water treatment plants is Aeration and use of Chlorination and potassium permagnate.

In a process train, these process are generally provided after screening as there is a generation of precipitate of Fe2+ and Mn2+ , which needs further removal in the forth coming sedimentation tanks.

The theoretical need of oxidant can be found out by the following chemical reactions:

Pros for chlorination are that it is very effective and also meets various other requirements like disinfection.

Cons are that sometimes it Chlorine forms some carcinogenic compounds which is very harmful for health.

Pros for Kmno4 is that it is effective and cheaper than other methods

Cons are that it leaves a pinkish color to the water which needs further removal and its use is limited to small scale like a society.

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