The links to these case studies include various application technologies. However, effective treatment is based on site-specific water chemistry and metal removal needs.
When you select these links you will be opening a new browser window and may be leaving our website. These links are being provided as a convenience and for informational purposes only; they do not constitute an endorsement by Graus Chemicals, and Graus Chemicals is not responsible for the availability of these sites or their contents
REMOTOX is a water-soluble 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. Most heavy metal ions are precipitated as metal sulfides by these breakdown products. Metal sulfides are much 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. In the case of chromium, REMOTOX reduces hexavalent chromium to trivalent state which then precipitates as chromium hydroxide in a one-step reaction.
While effective treatment can be achieved over a wide pH range, best results are typically obtained within water system 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.