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Agitation is performed ___________

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Agitation is performed ___________

(a) Mechanically

(b) Manually

(c) By help of cattle

(d) Feedstock

This question was posed to me in unit test.

My doubt stems from Problem involved in Biogas Production in section Biomass Energy of Energy Engineering

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Correct option is (a) Mechanically

The best explanation: Agitation can be done either mechanically or with a plunger or by means of rotational spraying of fresh influent. Agitation is normally required for both digesters, ensures exposure of new surfaces to bacterial action prevents viscid satisfaction and slow down of bacterial activity.

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