In the electrocoagulation of Drimarene Discharge X-3LG(R) (R12S) and S
amaron Yellow 4(R) (D05H), the effects of sacrificial anodes, initial
pH, rate of stirring and concentrations of dyes on the fraction of dec
olourization were tested. The experimental results revealed that the c
olour of dyes in the aqueous phase was effectively removed when iron a
nd aluminium were used as sacrificial anodes and the concentration of
the dyes was less than 100 p.p.m. When the concentration of R12S excee
ded 300 p.p.m. iron was a more suitable sacrificial anode for electroc
oagulation of R12S than aluminium. For the electrocoagulation of D05H
in aqueous solution aluminium as a sacrificial anode was superior to i
ron when the concentration of D05H exceeded 300 p.p.m. Using iron as s
acrificial anode, the residual concentration fraction of R12S was decr
eased below 10% when the initial concentration of R12S and charge pass
ed were 500 p.p.m. and 120 C, respectively. The decolourization fracti
on of D05H was 99% when aluminium was used as sacrificial anode.