Some specific operations in each of the step phases of sludge processing are described in the present work, amongst which the use of OMW as refrigerant becomes a relevant innovation. In fact, during the second period (with a duration of 1954 h over a total annual operating time of 7777 h) OMW is used as refrigerant instead of external water. This could lead to additional incomes if the avoided treatment cost is taken into account.
A preliminary economic analysis of the process shows critical indexes if the avoided costs for OMWs treatment and transport are not included, with negative values for NPV and lower IRR than the interest rate considered (sce- nario-2).
At scenario-3, the project becomes interesting as the scale factor reaches a value of 0.8, provided that 14.94% IRR and 6.25 years PBT values are obtained for a plant working life of 20 years, despite the initial 16.38 million € investment.
After the detailed analysis carried out in this work, the first scenario is regarded as the most favourable without any doubt, which includes the avoided cost for OMW treatment. In this situation the project becomes really inter- esting, depending on the scale economy, since IRR values between 21.01% and 29.80%, and PBT values between 3.33 and 4.66 years are obtained – note a relevant investment between 16.38 and 21.28 million € are needed.
Some specific operations in each of the step phases of sludge processing are described in the present work, amongst which the use of OMW as refrigerant becomes a relevant innovation. In fact, during the second period (with a duration of 1954 h over a total annual operating time of 7777 h) OMW is used as refrigerant instead of external water. This could lead to additional incomes if the avoided treatment cost is taken into account.A preliminary economic analysis of the process shows critical indexes if the avoided costs for OMWs treatment and transport are not included, with negative values for NPV and lower IRR than the interest rate considered (sce- nario-2).At scenario-3, the project becomes interesting as the scale factor reaches a value of 0.8, provided that 14.94% IRR and 6.25 years PBT values are obtained for a plant working life of 20 years, despite the initial 16.38 million € investment.After the detailed analysis carried out in this work, the first scenario is regarded as the most favourable without any doubt, which includes the avoided cost for OMW treatment. In this situation the project becomes really inter- esting, depending on the scale economy, since IRR values between 21.01% and 29.80%, and PBT values between 3.33 and 4.66 years are obtained – note a relevant investment between 16.38 and 21.28 million € are needed.
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