Question: Sludge has been mechanically dewatered to 20 % total solid content. From total solids, 75% is organic matter (VS) and 50% of organic matter

Sludge has been mechanically dewatered to 20 % total solid content. From

Sludge has been mechanically dewatered to 20 % total solid content. From total solids, 75% is organic matter (VS) and 50% of organic matter is assumed to be biodegradable (BVS). It is assumed that the composting process releases heat 23.3 MJ per kilo of biodegradable matter. Sludge is composted and the total solids content is set as 60 % for the final product. Calculate how much bulking agent is required per kilogram of sludge in order to reach 60 % total solids content for ready compost. The amount of energy for water evaporation (Q) is assumed to be 70% of that amount of energy which is released when composting biodegradable matter.

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