Fig. 6: Phosphorus runoff risks from land application of digestate.
From: Integrating regional transportation and ecological factors into anaerobic digestion siting decisions
Estimated risk of phosphorus runoff from cropland within a 20 km transportation radius of two distinct digester siting scenarios. The scenario shown on the left, marked with a black star on the center map, reflects a potential digester site within the Niagara River watershed where the largest amount of wasted food (WF) feedstocks can be sourced (Max WF Supply). The scenario shown on the right, marked with a black triangle on the center map, reflects a potential digester site within the Seneca Lake watershed that has the maximum remaining field capacity for accepting phosphorus (Max P Capacity Remaining). Within each region of interest, the croplands are shaded by curve number, which was calculated based on soil type, slope, and crop type. The inset bar charts indicate the distribution of cropland across the range of curve numbers, where lower curve numbers have a reduced potential for nutrient runoff following land application of digestate.
