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Heavy Metal Removal
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Industrial processes can often result in wastewater contaminated with heavy metals
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Heavy Metals, when in significant concentrations in water, may pose detrimental health effects.
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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.
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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.
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The water is then sent to a concentration tank to be treated by a tubular membrane filtration system.
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The settled sludge is periodically removed to a sludge tank.
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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.
