4.6. Impact of variation in biogas yield for MSW feedstock
It would be expected that the composition of MSW is highly variable and can influence the biogas yield by up to 10% compared to the average yield of 123 m3 t1 that was assumed in the MSW analyses (Wiljan, 2009). Fig. 9 shows a negative linear correlation of environmental damages with the biogas yield within the specified range. From this data, it was estimated that the total environmental impact of biogas production from MSW feedstock, will vary by about 0.075 Pt per unit percentage point variation in biogas yield