REMOTOX® is a calcium polysulfide based liquid that consists of multiple sulfur compounds, which strongly bond to heavy metals in water. The metal sulfides formed have a very low solubility and persist as stable solids, which allows for a more environmentally sound disposal.
REMOTOX is designed to bring practical, and cost-effective advantages to wastewater treatment, while ensuring discharge limits on heavy metals are consistently met.
When mixed with water, REMOTOX decomposes to form bisulfide, aqueous hydrogen sulfide and other sulfur compounds, Heavy metal ions are precipitated as metal sulfide by these breakdown products. Metal sulfides are far less soluble than metal hydroxides. Metal hydroxides change solubility with changes in pH. Metal sulfides remain insoluble within a wide pH range. See Solubility of Metal Hydroxides and Sulfides as a Function of pH.
While effective treatment can be achieved over a wide pH range, best results are typically obtained within water sytem pH 7-10. Ensuring adequate contact time and thorough mixing is critical to successful treatment. Dewatering the resulting precipitate can be expedited by employing an anionic flocculant.
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