White paper - Chemical feed control


Courtesy of W2 Systems

The controls, alarms and external contacts are shown on the drawings. As the amount of chemical needed to neutralize the wastewater varies exponentially from neutral pH 7, special consideration must be given to control overshooting the pH. Chemicals, especially viscous caustic soda, must be fully mixed in the compartment before more is added.

Rather than modulating the pump settings, the pump is fully on for a time proportional to the feed ratio needed. For example, turning on the pump for 10 seconds of the 30-second cycle, allows 1/3 of the full chemical flow to be added. This discussion also refers to injection systems that stop and start small, motorized pumps.

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