This invention offers an integrated technology in sequential treatment of
wastewater. Low biodegradable organics and heavy metal ions are both
contained in wastewater from surface finishing processes. The aim of the
invention is to find the solution for treatment of organics and heavy
metal ions in complicated wastewater that contains organics and heavy
metal ions sequentially. Low biodegradable organics are oxidized by a
fenton process with pH ranging from 2 to 5 and temperature ranging from
20.degree. C. to 100.degree. C. Heavy metal ions are then treated by a
ferrite process with pH ranging from 8 to 12 and temperature ranging from
20.degree. C. to 100.degree. C. The integrated technology of the fenton
process and the ferrite process (2FP) is advantageous to treat the
wastewater from surface finishing processes, decrease the production of
iron sludge caused in the fenton process and increase the quality of
ferrite products.