Application of Combined Electrochemical and Advanced Oxidation Processes on the Treatment of Azo Dye Reactive Black 5
Date Issued
2008
Date
2008
Author(s)
Chu, Hsiang-Yu
Abstract
This study investigated the treatment of Reactive Black 5 (RB5) dye via various oxidation processes such as 1) electro-chemical oxidation (ECO), 2) combined ultraviolet (UV) with with ECO (UV/ECO), 3) ozonation with ECO (OZ/ECO) and 4) photo-ozonation with ECO (UV/OZ/ECO). On the efficiencies of decomposition of RB5 (ηRB5), true color removal (ηADMI, ADMI = American Dye Manufacturers Insititute) and total organic carbon removal (ηTOC), respectively. Effect of votage (Ev), power of UV (PUV), concentration of applied ozone (CO3,in) and pH value were evaluated. The results showed that ηRB5 and ηADMI were about 71 and 75% at reaction time (t) of 2 h, for the ECO process with Ev = 1.5 volts (V). However, ηTOC was less than 2%. For the UV/ECO processes with Ev = 1.5 V and PUV = 13 watts (W), ηRB5, ηADMI and ηTOC were 99, 92 and 2% at t = 30 min, and 99, 99 and 5% at t = 2h. The results indicated that the introduction of UV enhances the ηRB5 and ηADMI, significantly, while the ηTOC moderately.During OZ/ECO processes with CO3,in = 16 mg L-1 and Ev = 1.5 V, RB5 and true color were almost completely removaled in 30 min and with ηTOC increased to 64% at 2 h. The corresponding ηRB5 , ηADMI and ηTOC for the sole OZ process were 99, 99 and 27%, and ηTOC = 64% at t = 2 h. Increaseing Ev from 1.5 to 3 V for the OZ/ECO, resulted in an increased of from 64 to 84% in 2 h. An increase of CO3,in from 16 to 20 mg L-1 further increased ηTOC 64% to 94% at 2 h for the OZ/ECO processes. As for the UV/OZ/ECO processes with PUV = 13 W, CO3,in = 16 mg L-1 and Ev = 1.5 V, RB5 and true color were almost completely removaled at 15 min with ηTOC = 22%. The values of ηTOC 94% at 45 min. As CO3,in increased from 16 to 20 mg L-1, TOC was almost removal in 45 min.
Subjects
electrolysis
electro-chemical oxidation
ozone
AOPs
Type
thesis
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