Table 5 Cost analysis from NP mixture input for biogas production.

From: Nanoparticles for improving biogas production and effluent biofertilizer

Item

Cattle manure-only

Fe + Ni + Co

Fe + Ni

Fe + Co

Ni + Co

Unit

1. Cumulative methane (L of substrate)

4.28

5.43

5.25

4.91

5.14

L

2. Income from methane productiona

2.65

3.36

3.25

3.04

3.18

USD

3. Cost of NPsb

-

0.217

0.211

0.204

0.0196

USD

4. Net income (2–3)

2.65

3.14

3.039

2.83

3.16

USD

5. Net profit (4-net income of cattle manure-only)

0

0.49

0.38

0.18

0.51

USD

  1. aCalculation of income from methane production was based on one L methane is equal to 0.620 USD (GlobalPetrolPrices.com).
  2. bCalculation of NPs cost was passed on 1 g NPs (Fe, Ni, and Co NPs with the same price) is equal 6.6 USD (Sigma scientific services Co., Cairo, Egypt).
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