Table 8 Benefit for the different size of the reactor size for the brick reactor producing biogas from (A) cow dung (CD), (B) CD/HF, (C) CD/grass silage, and (D) CD/maize silage
A) | Â | Reactor 1 | Reactor 2 | Reactor 3 |
|---|---|---|---|---|
 Reactor size | m3 | 3.28 | 7.05 | 15.09 |
 Annual CD | kg/ | 7942.4 | 15,884.8 | 23,827.2 |
 CHP capacity electricity | kWe | 0.04 | 0.22 | 0.41 |
 CHP capacity heat | kWth | 0.04 | 0.26 | 0.47 |
 CHP produced electricity/year | kW/year | 285.45 | 1764.64 | 3243.83 |
 CHP produced heat/year | kW/year | 296.43 | 1832.51 | 3368.60 |
 Benefit | $ | $− 11.72 | $143.28 | $298.28 |
 Production digested slurry | kg | 64.33 | 128.67 | 193.00 |
 Price digestate selling | $ | $2.63 | $5.26 | $7.89 |
 Total benefit | $ | $− 9.09 | $148.53 | $306.16 |
B) | ||||
 Amount CD + HF | kg | 1005.34 | 1898.86 | 2792.38 |
 CHP capacity electricity | kWe | 0.05 | 0.24 | 0.43 |
 CHP capacity heat | kWth | 0.06 | 0.28 | 0.49 |
 Produced electricity/year | kWe/year | 432.32 | 1911.52 | 3390.71 |
 CHP produced heat/year | kWth/year | 518.33 | 2291.80 | 4065.27 |
 Benefit co-digestion |  | $3.81 | $158.81 | $313.81 |
 Production digested slurry | kg | 93.50 | 176.59 | 259.69 |
 Price digestate selling | $ | $3.39 | $6.39 | $9.40 |
 Total benefit | $ | $7.20 | $165.20 | $323.21 |
C) | ||||
 Amount CD + grass | kg | 7393.52 | 8287.04 | 9180.56 |
 CHP capacity electricity/ | kWe | 0.25 | 0.43 | 0.62 |
 CHP capacity heat | kWth | 0.28 | 0.50 | 0.71 |
 ELECTRICITY produced electricity/year | kWe/year | 1939.31 | 3418.50 | 4897.70 |
 CHP capacity heat/year | kWth/year | 2237.67 | 3944.43 | 5651.19 |
 Benefit co-digestion | $ | $163.45 | $318.45 | $473.45 |
 Production digested slurry | kg | 554.51 | 621.53 | 688.54 |
 Price digestate selling | $ | $12.78 | $14.32 | $15.87 |
 Total benefit | $ | $176.23 | $332.77 | $489.31 |
D) | ||||
 Amount cow dung + maize | kg | 1149.02 | 2042.54 | 2936.06 |
 CHP capacity electricity/ | kWe | 0.18 | 0.36 | 0.55 |
 CHP capacity heat/ | kWth | 0.20 | 0.42 | 0.64 |
 Electricity produced/year | kWh/year | 1397.22 | 2876.41 | 4355.60 |
 CHP capacity heat/year | kWh/year | 1612.17 | 2191.98 | 3898.74 |
 Benefit biogas co-digestion | $ | $108.81 | $263.81 | $418.80 |
 Production digested slurry | kg | 67.36 | 119.73 | 172.11 |
 Price digestate selling | $ | $1.63 | $2.89 | $4.16 |
 Total benefit | $ | $110.43 | $266.70 | $422.96 |