TREATMENT OF TEXTILE WASTE-WATER BY HETEROGENOUS PHOTOCATALYTIC OXIDATION PROCESSES

Waste water (COD=1063 mg l(-1), BOD5=367 mg l(-1)) obtained from an in tegrated textile manufacturing plant was treated in two stages. In the first stage it was coagulated by 1200 mg l(-1) alum and 2 mg l(-1) po lyelectrolyte at pH=8. In the second stage application of photocatalyt ic advanced oxidation processes to the coagulated waste water was inve stigated. Treatment efficiency of the photocatalytic reaction was affe cted by pH, dosages of H2O2 and Fe3+. The experimental results indicat ed that photocatalytic treatment efficiency was enhanced by the additi on of 10 mM H2O2 and 1 mM Fe3+ ion at pH=4. the highest treatment effi ciency was obtained by the combination of coagulation and TiO2/Fe3+/H2 O2 treatment system resulting in a 75 % COD and 58 % BOD, removal.