2017 - Burcu İLERİ, Önder AYYILDIZ, İrem DOĞU, Mete YALÇIN -
Özet:The wastewaters containing high toxic compounds should be treated properly to the extent that can be suitably discharged into receiving waters. Most conventional treatment methods may not be successful for the degradation of recalcitrant compounds presented in water. Even some advance treatment methods remain unsuccessful to bring down their concentrations to the threshold levels. The wastewater from leather industries usually contains high concentration of chemical oxygen demand (COD), biochemical oxygen demand (BOD), suspended solids (TSS), total solids (TS), total kjeldahl-nitrogen, oil-grease, chromium (VI), total chromium, sulfur, salinity, total dissolved matter (TDS), organic nitrogen, and toxic metallic species. Prior to their discharges, such wastewaters should be sufficiently purified from toxic and inhibitory compounds in accordance with water quality guidelines. Advanced oxidation processes have been lately preferred in the treatment of recalcitrant organic compounds due to their effectiveness in the degradation process. In this study, wastewater samples from a tanning industry were treated with electrochemical (EC) and ultrasonic (US) processes in both single and combined (US/EC) operations. The effectiveness of the combined US/EC treatment was examined based on COD, color, turbidity removals. For the experiments made at alkaline conditions, the combined US/EC treatment involved synergistic effects providing higher removal efficiencies of COD, color or turbidity than those of additive use of ultrasound and electrochemical processes.
Anahtar Kelime:electrochemical,leather wastewater,ultrasound