The electrochem. oxidn. of PhOH for waste water treatment was studied at Pt and DSA anodes. Anal. of reaction intermediates and measurements of current efficiency showed that traditional anode materials (Pt, Ti/IrO2, Ti/RuO2, Ti/PbO2) give relatively low current efficiencies. Contrary to the Ti/SnO2 anode which not only gives high electrochem. oxidn. index values but allows quasi complete total org. C elimination. The electrochem. oxidn. was compared with the chem. oxidn. and a mechanism for the electrochem. oxidn. was proposed. [on SciFinder (R)]