Investigating Feasibility of C. I. direct Yellow 50 dye Degradation and Detoxicification in Synthetic Aquatic Solution Effluent by UVA/TiO2 Nanophotocatalytic process using Daphnia magna

Compounds containing dye are toxic, carcinogenic, and mutagenic for aquatic organisms and lead to mutagenicity, carcinogenicity, and dysfunction of human beings’ kidneys, liver, brain, reproductive system, and central nervous system. Advanced oxidation processes can remove pollutants faster than other processes due to active hydroxyl radical production. This study was aimed at investigating the feasibility of dye removal using UVA/TiO2 process. This study was done in a batch reactor and the effects of initial dye concentrations, TiO2 nanoparticles dosage, time, pH, and interference compounds on the efficiency of dye degradation were investigated. The Daphnia Magna as bioassay test and biodegradability index (BOD5/COD rate) were used for detoxification assessment. The D.Y50 dye effluent degradation at pH 2, 20 mg/l initial dye concentration and 1 g/l TiO2 catalyst was (lnC0/C= 1.4), (lnC0/C= 3) and (lnC0/C= 2.9) respectively. The dye removal rate by 50 mg/l COD concentration was (88%), the Daphnia Magna mortality rate after maximum contact time (96 h) decreased from 96.7% to 43.3% and the biodegradability index increased from 0.25 to 0.68. The current study indicated that UVA/TiO2 process after optimizing operational factors, has high efficiency in the degradation and detoxification of D.Y 50 dye effluent.