Nutrients/Description: Difference between revisions
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{{ComponentDescriptionTemplate | {{ComponentDescriptionTemplate | ||
|Reference=Bouwman et al., 2013b; Van Drecht et al., 2009; Cleveland et al., 1999; | |Reference=Bouwman et al., 2013b; Van Drecht et al., 2009; Cleveland et al., 1999; | ||
|Description====Wastewater=== | |Description====Wastewater=== | ||
Urban wastewater contains N and P emitted by households and industries that are connected to a sewerage system, and households with sanitation but without a sewerage connection. | |||
N discharges to surface water (''E<sub>sw</sub><sup>N</sup>'' in kg per person per year) are calculated as follows ([[Van Drecht et al., 2009]]; [[Morée et al., 2013]]): | N discharges to surface water (''E<sub>sw</sub><sup>N</sup>'' in kg per person per year) are calculated as follows ([[Van Drecht et al., 2009]]; [[Morée et al., 2013]]): | ||
{{FormulaAndTableTemplate|Formula1_N}} | ::{{FormulaAndTableTemplate|Formula1_N}} | ||
where | where | ||
: ''E<sub>hum</sub><sup>N</sup>'' is human N emissions (kg per person per year), | |||
: D is the proportion of the total population connected to public sewerage systems (no dimension), | |||
: R N is the overall removal of N through wastewater treatment (no dimension). | |||
Total P emissions to surface water are calculated in a similar way, but also include estimates of P emissions to surface water resulting from the use of P-based dishwasher and laundry detergents. Nutrient removal by wastewater treatment R is based on the relative contribution of four classes of treatment (none, primary, secondary and tertiary treatment). D is calculated from the proportion of households with improved sanitation. D and R by treatment class are scenario variables. | Total P emissions to surface water are calculated in a similar way, but also include estimates of P emissions to surface water resulting from the use of P-based dishwasher and laundry detergents. Nutrient removal by wastewater treatment R is based on the relative contribution of four classes of treatment (none, primary, secondary and tertiary treatment). D is calculated from the proportion of households with improved sanitation. D and R by treatment class are scenario variables. | ||
Soil nutrient budget | Soil nutrient budget | ||
Revision as of 16:09, 20 May 2014
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