Table 2 Total cost (direct and indirect operating cost), profit, and payback period include maintenance, operating supplies, laboratory charges, indirect operating costs, and general expenses during the period extended from January to December 2022
Item | 1000 person | 10,000 person | ||||
|---|---|---|---|---|---|---|
No. of units | Unit Cost ($) | Total Cost ($) | No. of units | Unit Cost ($) | Total Cost ($) | |
Direct operating cost (DMC) | ||||||
 Energy/electricity/Kwh/year | 5400 | 0.1 | 540 | 10,800 | 0.1 | 1080 |
 Labors (man/month | 36 | 133 | 4800 | 36 | 133 | 4800 |
 Maintenance (5% of the purchased cost of equipment) |  |  | 1853 |  |  | 6073 |
 Operating supplies (10% of maintenance) |  |  | 185 |  |  | 607 |
 Laboratory charges (10% of LABOR) |  |  | 480 |  |  | 480 |
 Subtotal |  |  | 7859 |  |  | 13,041 |
Indirect operating cost (IDMC) | ||||||
 Overhead (10% of labor and maintenance) |  |  | 665 |  |  | 1087 |
 Local taxes (1.5% of total capital investment) |  |  | 767 |  |  | 2386 |
 Insurance (0.5% of total capital investment) |  |  | 256 |  |  | 795 |
 Subtotal |  |  | 1688 |  |  | 4269 |
General expenses | ||||||
 Administrative costs (20% of overheads) |  |  | 133 |  |  | 217 |
 Research and development (3% of TMC) |  |  | 236 |  |  | 391 |
 Subtotal |  |  | 369 |  |  | 609 |
 Total operating cost (TOC) |  |  | 9916 |  |  | 17,919 |
 Depreciation (4% of TCI) |  |  | 1483 |  |  | 4859 |
 Total cost/year |  |  | 11,398 |  |  | 22,777 |
 Cost/m3 of treated wastewater |  |  | 0.21 |  |  | 0.04 |
 treated wastewater selling, $ |  |  | 10,800 |  |  | 108,000 |
 Profit $/year |  |  |  − 598 |  |  | 85,223 |
 payback period/year |  |  |  |  |  | 1.87 |