Decolourisation of real textile waste using electrochemical techniques: effect of electrode composition.
The present paper presents the study of the decolourisation of real textile effluent by constant current electrolysis in a flow-cell using a DSA type material. The effect of using different anode materials (Ti/Ru(0.3)Ti(0.7)O(2); Ti/Ir(0.3)Ti(0.7)O(2); Ti/Ru(X)Sn(1-X)O(2), where X=0.1, 0.2 or 0.3) on the efficiency of colour removal is discussed. Attempts to perform galvanostatic oxidation (40 and 60 mA cm(-2)) on the as-received effluent demonstrate that colour removal and total organic carbon (TOC) removal are limited. In this case the greatest degree of colour removal is achieved when anode containing 90% SnO(2) is used. If the conductivity of the effluent is increased by adding NaCl (0.1 mol L(-1)) appreciable colour/TOC removal is observed. The efficiencies of colour and TOC removal are discussed in terms of the energy per order (E(EO)/kW h m(-3)order(-1)) and energy consumption (E(C)/kW h kg(-1)TOC), respectively. Finally, the extent of colour removal is compared to consent levels presented in the literature.
Malpass
G R P
GR
Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil. gmalpass@iqsc.usp.br
Miwa
D W
DW
Machado
S A S
SA
Motheo
A J
AJ
D003116:Color; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D007202:Indicators and Reagents; D007220:Industrial Waste; D013056:Spectrophotometry, Ultraviolet; D013783:Textile Industry
D007202:Indicators and Reagents; D007220:Industrial Waste