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Table 3 Supplement items for a zero emission system

From: Energy efficiency in an integrated agro-ecosystem within an acidic soil area of the Mekong Delta, Vietnam

Item   Unit Equivalent factor (J/Unit) Reference Total
Natural non-renewable resource (NR)
 Water   kg 4.94E− 03 [18, 37] 49.40E+ 06
Purchased -non-renewable resource (PN)
 Plastic   kg 1.08E+ 08 [12] 2.80E+ 12
 Biogas sludge   kg 3.72E+ 05 [14] 1.25E+ 12
 Biomass (crop residues)   kg 1.88E+ 07 [44] 9.13E+ 08
 Biogas   m3 2.20E+ 07 [38] 1.95E+ 12