Results

The dual neutralization process has been active since September 24, 1991. During this time caustic use has decreased by 37% and the variable cost associated with neutralizing wastewater has decreased significantly. There have been no deleterious effects to the incineration system, and the percentage of acid neutralized with lime is being increased.

Figure 5

Figure 6 Cost of neutralizing Agent vs. pH. (□) Caustic soda; (A) lime; (q) both.

Hydroxide Addition

Hydroxide addition versus pH.

Figure 5

Lime Slurry

Mixing Tank

Figure 7 Lime neutralization process diagram.

Lime Slurry

Neutralization Basin

Neutralization Basin

Mixing Tank

Figure 7 Lime neutralization process diagram.

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