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The dewatered sludge cannot be disposed by ___________

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The dewatered sludge cannot be disposed by ___________

(a) Composting

(b) Heat drying

(c) Acid fermentation

(d) Incineration

I got this question in my homework.

The origin of the question is Sludge Thickening, Sludge Dewatering topic in portion Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Best answer
The correct answer is (c) Acid fermentation

To explain: Acid fermentation is a sludge digestion process and composting, heat drying and incineration are the methods of disposal of dewatered sludge.

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