Build a QSDsan wastewater and nutrient-recovery case

build_sanitation_system exposes a small structured QSDsan wastewater/nutrient-recovery workflow. It is not a general QSDsan flowsheet builder.

{
  "flow_tot": 1000,
  "concentrations": {
    "S_F": 200,
    "S_NH4": 40,
    "S_PO4": 8
  },
  "N_recovery": 0.6,
  "P_recovery": 0.8
}

flow_tot is in m³/h and concentrations are in mg/L. Concentration keys must be valid identifiers from QSDsan's default component set.

build_sanitation_system(spec={...})

The tool stores the QSDsan system and returns a result_id. The current implementation transfers the configured fractions of S_NH4 and S_PO4 into a recovered stream.

get_wastewater_results(result_id=...)

• Influent and effluent COD, BOD, TN, and TP.
• COD/TN/TP removal percentages where defined.
• Recovered NH4 and PO4 mass flow in kg/h.

get_flowsheet_diagram(result_id=...)
→ dispose_result(result_id=...)

Dispose the stored result only after the analysis no longer needs it.

For the documented 1000 m³/h case, 8 mg/L PO4 corresponds to 8 kg/h entering the system. At P_recovery = 0.8, the expected recovered PO4 mass is 6.4 kg/h. Likewise, 40 mg/L NH4 corresponds to 40 kg/h and N_recovery = 0.6 gives 24 kg/h recovered on the configured NH4 stream basis.

PO4: 8 mg/L × 1000 m³/h = 8 kg/h; 8 × 0.8 = 6.4 kg/h
NH4: 40 mg/L × 1000 m³/h = 40 kg/h; 40 × 0.6 = 24 kg/h

This narrow workflow does not independently establish wastewater characterization quality, biological kinetics, treatment feasibility, regulatory compliance, nutrient-product quality, life-cycle impacts, or TEA feasibility.