ElectroN-P Costing Method
Costing Method Parameters
The following parameters are constructed for the unit on the FlowsheetCostingBlock (e.g., m.fs.costing.electroNP) when applying the cost_electroNP costing method in the watertap_costing_package:
Description |
Symbol |
Parameter Name |
Default Value |
Units |
|---|---|---|---|---|
Hydraulic retention time |
\(HRT\) |
|
1.3333 |
\(\text{hr}\) |
Reactor sizing cost |
\(C_V\) |
|
1000 |
\(\text{USD}_{2020}\text{/m}^3\) |
Magnesium chloride cost |
\(C_{MgCl2}\) |
|
0.0786 |
\(\text{USD}_{2020}\text{/kg}\) |
Phosphorus recovery value* |
\(C_{RP}\) |
|
-0.07 |
\(\text{USD}_{2020}\text{/kg}\) |
* Negative value represents revenue from recovering phosphorus
Costing Method Variables
The following variables are used on the unit block (e.g., m.fs.unit.costing) when applying the cost_electroNP costing method in the watertap_costing_package:
Description |
Symbol |
Variable Name |
Index |
Units |
|---|---|---|---|---|
Inlet volumetric flow rate |
\(Q_{in}\) |
|
[t] |
\(\text{m}^3\text{/hr}\) |
Byproduct phosphate mass flow rate |
\(Q_{byproduct, S_{PO4}}\) |
|
[t] |
\(\text{kg/hr}\) |
Magnesium chloride flowrate |
\(Q_{MgCl2}\) |
|
[t] |
\(\text{kg/hr}\) |
Capital Cost Calculations
Capital cost depends on the unit’s inlet flow rate, \(Q_{in}\), as shown in the equation below:
\[C_{cap,tot} = HRT * Q_{in} * C_V\]
Operating Cost Calculations
Operating/maintenance costs consist of magnesium chloride usage cost and phosphorus recovery revenue:
\[C_{op,tot} = C_{op,MgCl2}+C_{op,RP}\]\[C_{op,MgCl2} = Q_{MgCl2} * C_{MgCl2} C_{op,RP} = Q_{byproduct, S_{PO4}} * C_{RP}\]