Photocatalytic degradation of wastewater from manufactured fiber by titanium dioxide suspensions in aqueous solution: a feasibility study

This investigation used wastewater from manufactured fiber plant for studyi ng the effect of controlling variables on the COD removal efficiency by pho tocatalyzed degradation of organic pollutants in the presence of titanium d ioxide catalyst. By using BOD/COD ratio as index, the treatment of raw wast ewater was evaluated for its change of biodegradability as a feasibility in the pre-treatment of biological treatment. The experimental results indica ted that with the Janssen Chemica TiO2 as catalyst, the optimal addition wa s 0.25 g/L with increasing COD removal for decreasing pH value. Both increa sed light intensity and continuous aeration increased COD removal efficienc y, particularly under continuous aeration for significantly raising the rat io of BOD/COD to improve efficiency of subsequent biological treatment.