Copper and zinc are heavy metals commonly present in highway stormwater runoff. Copper is of particular concern due to inhibitory effects on juvenile salmon at low concentrations. Zinc is often present at concentrations several times higher than copper and may compete with copper during adsorptive treatment processes. In the current study, Apatite IITM, a biogenic fish-bone based adsorbent, was evaluated for copper and zinc removal from stormwater. Batch, column, and field experiments were performed to examine the potential of Apatite IITM to remove copper from stormwater. In both batch and continuous systems, the release of phosphate and calcium were observed and Apatite IITM achieved high removal efficiencies. Precipitation was the primary mechanism of copper removal; the release of phosphate buffered the pH and induced precipitation of copper and zinc. Apatite IITM shows potential as a low-cost alternative to effectively remove copper and zinc to trace levels in highway stormwater runoff.

Evaluation of Apatite II<sup>TM</sup> for removal of copper and zinc from highway stormwater runoff

245th National Meeting (2013)

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Evaluation of Apatite IITM for removal of copper and zinc from highway stormwater runoff

Evaluation of Apatite II^TM for removal of copper and zinc from highway stormwater runoff