Treatment of Real Textile Wastewater by Using Potassium Ferrate(Ⅵ) and Fe(Ⅲ)/H_2O_2. Application of Aliivibrio Fischen and Brachionus plicatilis Tests for Toxicity Assessment

摘要

The paper presents the possibility of applying combined chemical oxidationprocesses using potassium ferrate(VI) (K2FeO4) and Fe(III)/H2O2 for the treatment of real wastewater f rom the textile industry characterised by an increased content of organic substances (COD = 1920 mg O-2/l). The use ofboth processes under optimal conditions included the use of the RSM method (Response Surface Methodology) in order to make it possible to decrease the COD of the wastewater by 75.4% (final COD - 472 mg O-2/l). The toxicity of wastewater treated under the most favourable conditions, determined using two test organisms (Aliivibrio fischeri and Brachionus plicatilis), decreased by 33 and 45%, respectively. In some cases the method described can be used on a larger scale.