283 Figure 4. (a) Geographical area of Iquitos showing polymetallic contamination [3,4]; (b) autonomous water decontamination system powered by solar energy; (c) autonomous water decontamination system: (d) system being transported after arriving; (e) system being deployed by population; (f) system being used in a Peruvian community in November 13, 2020. 4. CONCLUSIONS An economic assessment was conducted to calculate the unit cost of treated water based on energy consumption and system productivity. Figure 5 compares the developed solar technologies against conventional piped water and truck-delivered alternatives. The cost analysis uses the Lima residential electricity rate (0.793 USD/kWh) as the reference cost. The plant operates with a total installed solar capacity of 2.1 kW over an average of 10 hours per day. The unit cost was derived as follows:
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