ACUTE TOXICITY TESTING ON SLS SURFACTANT TREATMENT EFFLUENT USING ZnO PHOTOCATALYSIS TECHNOLOGY WITH Daphnia magna AS TEST ORGANISM

• Main Author: Bizarani, Bellia
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/36285
• Institution: Institut Teknologi Bandung

Laundry wastewater contains surfactant as the main constituent of mass-produce detergents. Anionic surfactants are among the commonly used detergents in everyday life, which represents 59% of surfactant used. One of the most extensively used is Sodium Lauryl Sulfate (SLS). In order to remove surfactants’ toxic substances, wastewater treatment is needed. One alternative that has the potential to remove surfactants from wastewater is Zinc-oxide (ZnO) photocatalysis technology. Artificial SLS wastewater was treated with varied ZnO doses 25 mg/L; 12.5 mg/L; 6.25 mg/L, while the pH effects study was undergone with variations of 3, 7, and 9. Afterwards, the effluent was subjected to acute toxicity test. This study was designed to evaluate the toxic effects of artificial SLS wastewater to Daphnia magna as well as assess the surfactant removal with ZnO photocatalyst technology in terms of toxicity. Experimental results showed that before photocatalysis treatment, artificial SLS wastewater LC50 value was about 18,8%. After treated with varied ZnO doses at 6.25 mg/L, 12.5 mg/L, and 25 mg/L, the LC50 values constantly decreased 8.65%; 7.35%; and 5.88%, respectively. On the other hand, the LC50 values of the effluent at pH 3, 7, and 9 were 6.93%; 8.65%; and 9%, respectively. The decreasing value of LC50 indicated that the wastewater is toxic. This was due to dissolved Zn metal as a photocatalyst and the toxicity of SLS even at low concentration.