Table 5

Impact results summary (per m3 wastewater treated) and percent change from baseline LCA scenario

Feedstock – AD performance scenario
Impact categoryUnitsBaselinePartial capacity – Base ADPartial capacity – Low ADFull capacity – Base ADFull capacity – Low AD
Acidification potential kg SO2 eq 1.0 × 10−3 6.6 × 10−4 1.1 × 10−3 5.4 × 10−4 1.1 × 10−3 
(% change)a n.a. −34% 13% −46% 14% 
Cumulative energy demand MJ 5.0 −1.7 3.7 −6.4 1.2 
(% change) n.a. −134% −27% −226% −76% 
Eutrophication potential kg N eq 0.02 0.03 0.03 0.03 0.03 
(% change) n.a. 10% 14% 20% 24% 
Fossil fuel depletion potential kg oil eq 0.05 −0.07 0.02 −0.15 −0.04 
(% change) n.a. −248% −60% −430% −184% 
Global climate change potential kg CO2 eq 0.36 0.01 0.19 −0.28 −0.05 
(% change) n.a. −98% −47% −176% −113% 
Particulate matter formation potential kg PM2.5 eq 5.4 × 10−5 1.8 × 10−5 5.6 × 10−5 −4.5 × 10−63 4.4 × 10−5 
(% change) n.a. −67% 3% −108% −19% 
Smog formation potential kg O3 eq 0.02 8.3 × 10−3 0.02 3.7 × 10−3 0.02 
(% change) n.a. −50% 5% −78% 2% 
Water use m3 H2−0.13 −0.12 −0.12 −0.12 −0.12 
(% change) n.a. 1% 1% 1% 2% 
Feedstock – AD performance scenario
Impact categoryUnitsBaselinePartial capacity – Base ADPartial capacity – Low ADFull capacity – Base ADFull capacity – Low AD
Acidification potential kg SO2 eq 1.0 × 10−3 6.6 × 10−4 1.1 × 10−3 5.4 × 10−4 1.1 × 10−3 
(% change)a n.a. −34% 13% −46% 14% 
Cumulative energy demand MJ 5.0 −1.7 3.7 −6.4 1.2 
(% change) n.a. −134% −27% −226% −76% 
Eutrophication potential kg N eq 0.02 0.03 0.03 0.03 0.03 
(% change) n.a. 10% 14% 20% 24% 
Fossil fuel depletion potential kg oil eq 0.05 −0.07 0.02 −0.15 −0.04 
(% change) n.a. −248% −60% −430% −184% 
Global climate change potential kg CO2 eq 0.36 0.01 0.19 −0.28 −0.05 
(% change) n.a. −98% −47% −176% −113% 
Particulate matter formation potential kg PM2.5 eq 5.4 × 10−5 1.8 × 10−5 5.6 × 10−5 −4.5 × 10−63 4.4 × 10−5 
(% change) n.a. −67% 3% −108% −19% 
Smog formation potential kg O3 eq 0.02 8.3 × 10−3 0.02 3.7 × 10−3 0.02 
(% change) n.a. −50% 5% −78% 2% 
Water use m3 H2−0.13 −0.12 −0.12 −0.12 −0.12 
(% change) n.a. 1% 1% 1% 2% 

aPercentage change = [(Co-digestion impact−Baseline impact)/Baseline impact].

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