Heavy Metal Removal  

  • Industrial processes can often result in wastewater contaminated with heavy metals

  • Heavy Metals, when in significant concentrations in water, may pose detrimental health effects.

  • Heavy metals include lead, silver, mercury, copper, nickel, chromium, zinc, cadmium and tin that must be removed to certain levels to meet discharge requirements or be recycled for reuse.

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  • The feed water containing dissolved metals is fed to reaction tank #1 where chemicals (such as NaOH) are added to form metal hydroxides, which will precipitate out from water.

 

  • The water is then fed to reaction tank #2 where additional chemicals and coagulant are added to control pH and further enhance precipitation and the formation of solids.

 

  • The water is then sent to a concentration tank to be treated by a tubular membrane filtration system.

 

  • The settled sludge is periodically removed to a sludge tank.

 

  • The accumulated sludge is sent to a filter press for de-wetting and then disposed. The excess water from the press is piped back to the concentration tank.

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