PENGARUH KONSENTRASI H2O2 DAN Fe2+ DALAM PROSES FOTOFENTON TERHADAP PENURUNAN NILAI COD LIMBAH LAUNDRY; EFFECT OF H2O2 AND Fe2+CONCENTRATIONS IN THE PHOTOFENTON PROCESS ON THE DECREASE OF COD VALUE IN LAUNDRY WASTEWATER

Leswana, Nurlillahi F, Endang Tri Wahyuni

2015 | Skripsi | FMIPA

In this research, effect of H2O2 and Fe2+ concentrations in the photofenton process on the decreasing COD value of laundry waste water has been studied. The photofenton process was carried out by irradition of the mixture of laundry wastewater, Fe2+ solution, and H2O2 solution with UV light. Influence of Fe2+ and H2O2 concentration was examined by varying Fe2+ concentration of 1, 2, 5, 10 and 15 mM and for H2O2 concentration of 50, 100, 200, 300, 400, 500 mM. Photofenton process was performed at pH 3 and irradiation by UV light for 3 hours. The results of the research show that the laundry wastewater from a laundry service in Yogyakarta contains COD value as much as 816 mg/L, and dodecyl benzenesulfonate was found as the main compound that contributed a high COD value of laundry wastewater. In the application of photofenton process, the presence of Fe2+, H2O2 and UV light irradiation can reduce the COD value of laundry wastewater more effective up to 224 mg/L compared to that in presence of H2O2 and Fe2+ in solution but without irradiation by UV light. Increasing of Fe2+ and H2O2 concentration enchances the effectiveness in decreasing COD value of laundry wastewater. The use of Fe2+ and H2O2 concentrations that are higher than Fe2+; 5 mM and H2O2; 200 mM was not effective for decreasing COD value of laundry wastewater. Photofenton process with a time of irradiation for 3 hours can reduce the COD value of laundry wastewater to 192 mg/L in the presence of Fe2+ and H2O2 at optimum concentrations. The optimum concentration of Fe2+ was found at 5 mM and the optimum concentration of H2O2 was found at 200 mM which has a ratio of H2O2/Fe2+ as much as 40. The COD value of laundry wastewater can be decreased below the standard level of regulated by Government, e.g 125 mg/L using 2 step of photofenton process with final COD value of 86 mg/L.

Kata Kunci : H2O2; Fe2+; COD; laundry.