| Waste
Water Treatment Control System in a Manganese Manufacturing
Chemical Plant.
SUMMARY:
Develop and install a PLC/HMI controls system for the complete
Chemical Neutralization process of the plant waste materials.
DESCRIPTION:
The PLC monitors the level, pH, ORP, turbidity and temperature
of the 25,000 gallon process tanks. Agitation time, flocculation
time, aeration time and settling time are all controlled from
the PLC. The system is designed to add anionic
polymer, cationic polymer, lime and acid at proper proportions
and proper phases throughout the staged process. The
PLC controls all of the process valving and pumping as the
waste gets transferred through the various wash tanks, surge
tanks, sand filters, filter press and outfall.
The operator station (HMI) graphically depicts the process and
display complete process status, timers, setpoints, flows, levels,
pH, turbidity, temperatures and totals. Additionally, the
operator can view the process from the real-time or historical
trend screens for any of the parameters. All system faults
are alarmed, recorded and displayed on the operator station.
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