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Which of the following treatment involves addition of metal salts?

(a) Adsorption

(b) Chemical treatment

(c) Biological treatment

(d) Reverse osmosis

I had been asked this question by my college professor while I was bunking the class.

I would like to ask this question from Microbial Recovery of Phosphate topic in chapter Bioleaching and Biomining for Recovery of Resources of Environmental Biotechnology

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Correct choice is (b) Chemical treatment

The best I can explain: Chemical treatment involves addition of metal salts which forms solid precipitates and then separated by a few filtration techniques. Biological treatment, adsorption and reverse osmosis is used for heavy metal removal from water, these processes don’t involve addition of metal salts, hence, it is not chemical treatment.

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