plants. However, a high concentration of chlorides makes extensive evaporation of the solution hazardous because of the probability of explosion. Consequently, the most feasible disposal of the recovered material is recycling into the production of nitrogen solutions.

Table 7.38.4 shows the materials recovered daily from 900,000 gal of nitrogen fertilizer plant wastewater. Table

7.38.2 shows that 15 ppm of silica, SiO2, is in the waste-water. The ion-exchange treatment system does not remove silica since the anion resin used is a weak-base type. Consequently, the deionized water produced by the ion-exchanger is not entirely satisfactory for use as coolingtower makeup water or boiler feed water because of the silica content.

The plant can add silica polisher (a standard fixed-bed exchanger using a strong-base anion resin) to the system to remove silica and produce deionized water satisfactory for all inplant use. This addition permits complete wastewater recycling and reuse in a closed-loop system.

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