The scenario
A wastewater treatment plant uses pH neutralization to adjust effluent pH before discharge. Acidic influent is mixed with a base reagent in a continuously stirred tank, with pH monitored by a sensor and controlled by a PID valve.
What is in this drawing
Read the decisions behind it.
01
Modeling feedback with sum junction
02
Including disturbance as additional input to a sum
03
Using sensor block with route above for clear feedback representation
When designing or documenting a single-input single-output (SISO) process control loop with measurable disturbance, particularly in chemical processing or water treatment.
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