of ferrous ions. It was also found that the Fenton process provided
the highest efficiency as the second most effective process
on the degradation of both toxic contaminants. From the combination
of Fenton and photo-Fenton processes, it is suggested
that applying UV light at an early stage might not be necessary
for a speedy oxidation reaction of the Fenton process. With
Fenton and photo-Fenton processes, mineralization of formaline
wastewater can be achieved, as no residual TOC is detected in
the effluent after 180 and 240 min reaction period. In addition,
toxicity reduction was determined for final effluents from each
process. The effluents of the Fenton and photo-Fenton applications
after 120 min treatment can be safely disposed of with
relatively low toxicity to environment.