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How much thick layer of insulation is done inside of digester?

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How much thick layer of insulation is done inside of digester?

(a) 10 cm

(b) 15 – 25 mm

(c) 8 mm

(d) 50 – 100 cm

The question was asked in final exam.

My enquiry is from Anaerobic Fermentation in division Biomass Energy of Energy Engineering

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The correct option is (d) 50 – 100 cm

Easiest explanation: In hot regions it is relatively easy to simply shade the digester to keep it in the ideal range of temperature, but cold climates present more of a challenge. The first action is, naturally, to insulate the digester with straw or wood shavings. A layer about 50 – 100 cm thick, coated with a waterproof covering is a good start.

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