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The bacteria mainly responsible for crown corrosion in a sewer is ______.

1. Methanogenic bacteria
2. Denitrifying bacteria
3. Sulphur reducing bacteria
4. Pseudomonas bacteria

Correct answer: Sulphur reducing bacteria

Solution

Sulphur reducing bacteria are primarily responsible for crown corrosion in sewers because they produce hydrogen sulfide, which can lead to the deterioration of concrete and other materials in sewer systems.

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