TITLE:
Impact of Powdered Activated Carbon and Anion Exchange Resin on Photocatalytic Treatment of Textile Wastewater
AUTHORS:
Preethi Grace Theva Neethi Dhas, Holger Gulyas, Ralf Otterpohl
KEYWORDS:
Activated Carbon, Anion Exchange, Hybrid Process, Photocatalytic Oxidation, Textile Industry Effluent
JOURNAL NAME:
Journal of Environmental Protection,
Vol.6 No.3,
March
5,
2015
ABSTRACT: In order
to clarify the impact of activated carbon and anion exchange resin on photocatalytic
oxidation (PCO) of textile industry wastewater, TiO2-based PCO was
investigated with aqueous solutions containing the reactive dye Reactive Blue 4
(RB4) and with a textile dye house effluent in the absence and in the presence
of powdered activated carbon (PAC) and the anion exchange resin Lewatit MP 500.
Addition of Lewatit improved RB4 removal to a larger extent than PAC addition.
Contrasting to chloride and sulfate, hydrogen carbonate clearly inhibited PCO
of RB4. However, the depression of dye removal by hydrogen carbonate was minute
in the presence of Lewatit although the hydrogen carbonate concentration was
not markedly decreased. Unfortunately, the beneficial effect of Lewatit
addition on PCO nearly disappeared when the Lewatit/TiO2 mixture was
reused three times. This was probably caused by oxidative damage of the resin.
Color removal from the real dye house effluent during PCO was improved by
Lewatit, but not by PAC. Contrastingly, PAC addition increased TOC removal by
PCO from the real wastewater to some extent, while Lewatit had no impact.
Sorbent addition does not lead to an acceptable area demand for solar PCO of
the dye house effluent.