PENGARUH KONSENTRASI H2O2 DAN Fe2+ DALAM PROSES FOTOFENTON TERHADAP PENURUNAN NILAI COD LIMBAH LAUNDRY

NURILLAHI FEBRIA L., Prof. Dr. Endang Tri Wahyuni, M.S. ; Prof. Dr. Mudasir, M.Eng, Ph.D.

2015 | Skripsi | S1 KIMIA

INTISARI Pengaruh Konsentrasi H2O2 dan Fe2+ dalam Proses Fotofenton terhadap Penurunan Nilai COD Limbah Laundry Oleh Nurillahi Febria Leswana 11/313054/PA/13628 Dalam penelitian ini telah dikaji pengaruh konsentrasi H2O2 dan Fe2+ pada proses fotofenton terhadap penurunan nilai COD limbah laundry. Proses fotofenton pada limbah laundry dilakukan dengan cara menyinari campuran yang terdiri dari limbah laundry, larutan Fe2+ dan larutan H2O2 dengan lampu UV. Pengaruh konsentrasi ion Fe2+ dan H2O2 dipelajari dengan cara memvariasikan konsentrasi ion Fe2+ yaitu 1, 2, 5, 10 dan 15 mM dan variasi konsentrasi H2O2 yaitu 50, 100, 200, 300, 400, 500 mM. Proses fotofenton dilakukan pada pH 3, dan waktu penyinaran 3 jam. Hasil penelitian menunjukan bahwa limbah laundry yang diambil dari suatu jasa laundry di Yogyakarta memiliki nilai COD awal sebesar 816 mg/L dengan senyawa utama penyumbang nilai COD tinggi adalah dodesil benzenasulfonat. Pada penerapan proses fotofenton dengan adanya Fe2+, H2O2, dan sinar UV dapat menurunkan nilai COD lebih efektif hingga mencapai 224 mg/L dibandingkan dengan penurunan nilai COD limbah laundry dengan adanya larutan H2O2 dan Fe2+ tanpa penyinaran. Kenaikan konsentrasi Fe2+ dan H2O2 dalam proses fotofenton dapat meningkatkan efektivitas penurunan nilai COD limbah laundry, namun penggunaan konsentrasi Fe2+ dan H2O2 yang lebih besar dari konsentrasi Fe2+; 5 mM dan H2O2; 200 mM menyebabkan menurunnya efektivitas penurunan nilai COD limbah laundry. Proses fotofenton dengan waktu penyinaran selama 3 jam dapat menurunkan nilai COD limbah laundry secara maksimal menjadi 192 mg/L dengan penggunaan ion Fe2+; 5 mM dan H2O2; 200 mM atau rasio H2O2/Fe2+ sebesar 40. Nilai COD limbah laundry dapat mengalami penurunan hingga memenuhi baku mutu Pemerintah yaitu 125 mg/L melalui 2 tahap proses fotofenton hingga mencapai nilai COD akhir 86 mg/L.

ABSTRACT Effect of H2O2 and Fe2+ Concentrations in The Photofenton Process on The Decrease of COD value in Laundry Wastewater By Nurillahi Febria Leswana 11/313054/PA/13628 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 : Fotofenton, H2O2, Fe2+, COD, laundry, photofenton