Table 6. Estimated costs (in USD) for the construction, operation and maintenance of the pilot and industrial GCC reactors.

Pilot reactor (10 m³)

Industrial reactor (100 m³)

Option 1

Option 2

Option 1

Option 2

 Construction

 Anaerobic compartment

130

1,800

1,925

10,300

 Headspace compartment

185

2,500

2,900

21,600

 Aerobic compartment^a

700

700

2,900

2,900

 Feeding pump

69

69

210

210

 Water recirculation pump

69

69

210

210

 Accessories (5%)

58

257

407

1,761

 Subtotal

1,211

5,395

8,552

36,981

 Subtotal (per year)^b

61

270

428

1,849

 Solar panels installation

3,740

3,740

28,740

28,740

 Total

4,951

9,135

37,292

65,721

 Total (per year)^b

248

457

1,865

3,286

 Operational and maintenance costs (per year)

 Energy for pumps^c

580

580

988

988

 Salaries

176

176

352

352

 Electricity to cover 20% of anaerobic  compartment heating

179

179

1,786

1,786

 Subtotal

935

935

3,126

3,126

 Electricity to cover 80% of anaerobic  compartment heating (per year)

715

715

7,146

7,146

 Total (per year)

1,650

1,650

10,272

10,272

 Total costs (per year)

 Using solar collectors

1,183

1,392

4,991

6,412

 Using electricity

1,711

1,920

10,700

12,121

Option 1: Polyethylene vessels with capacity of 1, 2.5, 10 and 15 m³. Plastigama. National Industry, Ecuador. Option 2: Stainless steel (4 mm); manpower included.
^aConcrete (Ecuador, local construction prices of 2007, 130 USD/kg concrete).
^bConsidering an operational lifetime of 20 years for reactors and collectors.
^c0.5 and 0.85 HP for the pilot and industrial reactor, respectively.