Lupong Kaewsichan, Jirawan Sriyom, and Charan Bunyakan

pp. 591 - 600

Abstract

A treatment of phenolic compound with fenton reaction together with coagulation by calcium oxide
was investigated in this study. COD and residual substances were monitored throughout the work. Phenol
and 2,4-Dichlorophenol were selected to represent different kinds of the compound. The weight ratio of
fenton reagent or Iron ion: Hydrogen peroxide: CaO was 1:11.7: 4.5, whereas the concentrations of phenolic
compound were 1100 and 550 ppm. In case of 1100 ppm, the weight ratio of phenolic compound: Iron ion
was 1: 0.65 and in the case of 550 ppm, the weight ratio of phenolic compound: Iron ion was 1: 0.45. The
results of the treatment were as follows: percent reduction of CODs of phenol solutions was more than the
reduction of 2,4-Dichlorophenol solutions (99% and 85% of 1100 ppm and 97% and 93% of 550 ppm).
Comparison of the amount of sulfate in solution and in sediment revealed that, with both phenol and 2,4-
Dichlorophenol solutions, the percent of sulfate in the solution was greater than the percent in the sediment
(86% and 69% for phenol and 2,4 Dichlorophenol of 1100 ppm) and (93% and 76% for phenol and 2,4- Dichlorophenol of 550 ppm). Comparison of the amount of calcium in solution and in sediment showed that,
with both phenol and 2,4-Dichlorophenol solutions, the percent of calcium in the solution was lower than the
percent in the sediment (38% and 54% for phenol and 2,4-Dichlorophenol of 1100 ppm) and (48% and 59%
for phenol and 2,4-Dichlorophenol of 550 ppm). Almost 100% of Iron residual in the solution was formed in
sediments for all cases.