Method for treating wastewater containing heavy metals with used iron oxide catalyst
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United States of America Patent
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Dec 23, 2003
Grant Date -
Feb 13, 2003
app pub date -
Apr 8, 2002
filing date -
Apr 16, 2001
priority date (Note) -
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Abstract
The present invention is to provide a method for treating a wastewater containing heavy metals using a used iron oxide catalyst, which is to treat an acidic wastewater having a pH value of about 1.0 and containing Cu, Fe, Ni, Cr or Zn, the method including: adding the used iron oxide catalyst containing at least 70% magnetite (Fe.sub.3 O.sub.4) to the wastewater at a weight ratio of 1:0.05; stirring the wastewater mixed with the iron oxide catalyst at a speed of 60 rpm for 15 minutes in a stirrer; and subjecting the wastewater to solid-liquid separation using a magnet for adsorption and removal of the heavy metals.
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