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working with CaSx #2

Cr(VI) reduction using calcium polysulfide.

PRIMA has conducted thousands of bench-scale tests to evaluate in situ chemical oxidation (ISCO) and in situ chemical reduction (ISCR). ¬†Oxidants evaluated include permanganate, ozone, ozone plus peroxide, persulfate, activated persulfate, hydrogen peroxide, and catalyzed hydrogen peroxide (Fenton’s reagent). ¬†Reductants evaluated include calcium polysulfide (CaSx), zero-valent iron (ZVI), and hematite.

Common tests include measurement of soil oxidant demand, evaluation of contaminant removal, estimation of reagent dose and time required for contaminant removal, evaluation of potential secondary effects, and assessment of the ability of secondary effects to attenuate post-treatment.