earticle

영어

In this study, the recycling integrated process composed of fluidized biofilter and UV-photocatalytic process as advanced oxidation process (AOP) was constructed to evaluate the efficiency and the comparability to the conventional wastewater treatment, for the treatment of real textile wastewater. The real textile wastewater containing various dyes, surfactants, polyvinyl alcohol(PVA), hydrolyzed polyester and other recalcitrant organic substances, was fed to fluidized biofilter with the stream recycled (recycle ratio=0.83) from a photocatalytic reactor, into which the fluidized biofilter-treated wastewater entered. The recycled stream from UV-photocatalytic reactor to the fluidized biofilter was designed to enhance the biodegradability of bio-recalcitrant organic chemicals from textile wastewater. The return-sludge obtained from a textile wastewater treatment facility located in Daegu, was immobilized at the fluidized media in the biofilter and the photocatalytic reactor was filled with TiO2 coated-glass bead media. The COD values of feed, biofilter-treated wastewater and the effluent from photocatalytic reactor were 1800ppm, 360-390ppm and 320-360ppm, respectively. Thus the COD removal efficiency of the integrated system was maintained at 80%, composed of the one of the fluidized biofilter(72-75%) and the one of photocatalytic reactor(5-8%). The ADMI color values of feed, biofilter-treated wastewater and the effluent from photocatalytic reactor were 1350, 630-660 and 570-615ppm, respectively. The color removal efficiency of the integrated system was maintained at 55%, composed of the one of the fluidized biofilter(45%) and the one of photocatalytic reactor(10%). It was noticeable that the color removal efficiency of UV-photocatalytic process was almost twice the COD removal efficiency of the same process. The space loading of this study is calculated as 1.22 kg COD/day/m3, which is almost six times of the space loading value of conventional activated sludge reactor.