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The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5. On the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?

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The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5. On the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?

(a) Soap factory

(b) Detergent factory

(c) Alcohol distillery

(d) Plastic cup manufacturing factory

The question was posed to me during an internship interview.

My question is taken from Oxygen Transfer in Fermenters topic in division Mass Transfer of Bioprocess Engineering

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The correct answer is (c) Alcohol distillery

The best explanation: Fermentation is the chemical procedure which is utilized in alcohol industry. We know that fermentation produces lactic acid and ethanol. Ethanol changes into ethanoic acid on oxidation.

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