Method for treating heavy-metal-containing wastewater using sulfidizing agent
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United States of America Patent
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Sep 4, 2007
Grant Date -
Nov 25, 2004
app pub date -
Aug 29, 2002
filing date -
Sep 3, 2001
priority date (Note) -
Expired
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Abstract
A method and apparatus for treating heavy-metal-containing wastewater using a sulfidizing agent. Sulfidizing treatment is carried out by adding a sulfidizing agent to heavy-metal-containing wastewater, while detecting hydrogen sulfide gas generated from the wastewater, such as to maintain a state in which hydrogen sulfide gas is just starting to be generated from the wastewater. When separately recovering each of a plurality of metals from wastewater in which are mixed ions of the plurality of metals, there is repeated for each of the metals a process in which the acidity of the wastewater is adjusted to within a range suitable for the metal to be separated out and recovered, a sulfidizing reaction is carried out on that metal, and the metal sulfide produced is precipitated and filtered off.
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