Figure 3
Chart (a): Impact of activities before waste treatment: The vertical bar chart is drawn on a coordinate plane. The horizontal axis lists four categories in left-to-right order: “global warming (kilogram carbon dioxide equivalent per functional unit)”, “eutrophication (gram phosphate equivalent per functional unit)”, “photochemical oxidation (gram acetylene equivalent per functional unit)”, and “acidification (gram sulphur dioxide equivalent per functional unit)”. The vertical axis ranges from 0 to 1.6 in increments of 0.2. There are eight bars in total, with two bars per category representing “Recovery” and “Donation”. Values for “Recovery”: global warming: 0.4. eutrophication: 0.32. photochemical oxidation: 0.06 acidification: 1.35. Values for “Donation”: global warming: 0.25. eutrophication: 0.40. photochemical oxidation: 0.02. acidification: 0.80. Chart (b): Total impact (including system expansion): The vertical bar chart is drawn on a coordinate plane. The horizontal axis lists the same four categories in the same left-to-right order: “global warming (kilogram carbon dioxide equivalent per functional unit)”, “eutrophication (gram phosphate equivalent per functional unit)”, “photochemical oxidation (gram acetylene equivalent per functional unit)”, and “acidification (gram sulphur dioxide equivalent per functional unit)”. The vertical axis ranges from negative 35 to 15 in increments of 5. There are eight bars in total, with two bars per category representing “Recovery” and “Donation”. Values for “Recovery”: global warming: 0.8. eutrophication: 4. photochemical oxidation: 0. acidification: 11. Values for “Donation”: global warming: negative 4. eutrophication: negative 26. photochemical oxidation: negative 1. acidification: negative 30. Note: All numerical values are approximate.Environmental impact before waste treatment (a) and total environmental impact for the two options (b)