| Summary: | In order to reduce environmental contamination caused by laundry wastewater, application of photodegradation method catalyzed by TiO2 to anionic surfactant in laundry wastewater was studied. Photodegradation was carried out by irradiating a mixture of wastewater and TiO2 with UV rays as photon source in a closed UV reactor installed with magnetic stirrer. In this photodegrdation, the effect of quantity of TiO2 photocatalyst and photodegradation time was evaluated. Analysis of anionic surfactants before and after photodegradation was carried out by spectrophotometry UV-Visible method as Methylene Blue Active Substances (MBAS). This MBAS method was validated by several validation parameters.
The result showed that the addition of TiO2 as photocatalyst increases the concentration of degradated anionic surfactant from 33,14% to 96,68%. Degradation increased with the addition of TiO2 up to 0,6 mg/mL. The longer exposure time also increased the concentration of degradated anionic surfactant up to 24 hours with optimum degradation of 96,69%. Photodegradation was relatively constant at a longer exposure time. The TiO2 crystallinity decreased after being used for photodegradation due to the interaction between the surfactant and TiO2.
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