The calculation of expenses for the heat and electricity for the complete cycle of treatment and utilization of sludge should take into account the quantity of energy that may be obtained from sludge. Utilization of that energy can significantly reduce expenses for sludge treatment.
A comparison of sludge treatment processes shows that in terms of the energy required, composting is the most economical method. It is reasonable to prepare compost from dewatered raw sludge because it contains more organics than does digested sludge. At the same time, the scheme of sludge treatment should provide the possibility of the maximum reduction of moisture with the minimum expenditures.
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