WRM web version: Treatment nodes

A WRM scenario can include any number of treatment nodes. A treatment node represents a water or wastewater treatment plant; its primary purpose is to modify the quality of its constrained through-flow. The treatment node includes an implicit bifurcation: inflow that exceeds its hydraulic capacity is automatically routed to a bypass, untreated.

The following data are defined for a treatment node:

• name, MEAT DATA (author, created, last modified, descriptive text);
• type (level of treatment): list of SYMBOLS;
• hydraulic capacity (maximum flow); includes an automatic bypass !
• removal efficiency (in %) for:
  • BOD, nitrate, phosphate, conservative tracer
• water quality standards for the 4 pollutants;

Node functionality

Effect on water quality:a the node reduces pollutant concentration in its inflow according to the specified removal efficiencie - up to its hydraulic capacity ! Inflow beyond hydraulic capacity (e.g., due to stormwater runoff) is asssumed to bypass the treatment node, leading to a mixture of treated and untreated water in its outflow.

Dynamic Output Time Series:

1. DYNAMIC INPUT: inflow (return flow from an urban, industrial or agricultural demand node).
2. concentration TS of inflow (BOD, phosphate, nitrates, tracer);
3. untreated bypass flow.
4. concentration TS in outflow (as above, should indicate violations in RED !);
5. water quality standards: violations (%), AOT (average above threshold);
6. average treatment efficiency.

Development Notes: