Wastewater Treatment

REMOTOX® is a strong, yet relatively inexpensive precipitant for removing a wide range of heavy metals from wastewater streams.

Product Features
  • Its residues are inert and non-toxic.
  • REMOTOX does not contain dithiocarbamate or its related salts.
  • No need to dissolve prior to use as compared to solid material.
  • Has a very low crystallization (salt-out) temperature.
  • NSF approved for drinking water treatment.
  • Not regulated by the Department of Transportation (DOT).
  • Compared to other sulfides, such as sodium hydrosulfide, it provides more stability in acidic medium.
  • REMOTOX has been tested to maintain its effectiveness for a minimum of one year.

REMOTOX® Calcium Polysulfide for removing copper, zinc, lead, chromium, cadmium, cyanide and other metals from process wastewater.

Many industries, including metal finishing, printed circuit board manufacturing, pulp and paper, food processing, and mining operations produce wastewater streams containing significant amounts of metals. REMOTOX has been proven effective in removing a broad range of heavy metal ions and other inorganic compounds.

Heavy Metal Precipitation by Calcium Polysulfide, Remotox.

Calcium Polysulfide dosage guidelines available upon request.

Application Advantages

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. See Calcium Polysulfide Chemical Reactions. 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. In the case of chromium, REMOTOX reduces hexavalent chromium to trivalent state which then precipitates as chromium hydroxide in a one-step reaction; therefore, no need for bisulfite, metabisulfite, sulfur dioxide or sulfuric acid.

While effective treatment can be achieved over a wide pH range, best results are typically obtained within water system pH 7-10. See pH Guidelines for Treatment of Soluble Metal Streams. Ensuring adequate contact time and thorough mixing is critical to successful treatment. Dewatering the resulting precipitate can be expedited by employing an anionic flocculant.

For additional information, heavy-metal removal studies, samples or assistance, please contact us.

REMOTOX® is a sulfide based liquid, designed to bring cost savings and practical advantages to wastewater treatment, while ensuring discharge limits on heavy metals are consistently met. 

Calcium Polysulfide for heavy metal precipitation