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Studi Penurunan Kandungan Besi Organik dalam Air Tanah dengan Oksidasi H2O2-UV
Rohmatun1, Dwina Roosmini2& Suprihanto Notodarmojo1
1Kelompok Keahlian Rekayasa Air dan Limbah Cair
2Kelompok Keahlian Teknologi Pengelolaan Lingkungan
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung
Jl. Ganesha No.10, Bandung 40132
Abstract. Dissolved Fe (II) can react with organic matters and form complex compounds which difficult to be eliminated by ordinary aeration. One of alternative technology to eliminate the dissolved iron is by using Advanced Oxidation Processes (AOPs) which can yield hydroxyl radicals (OH•). The formed hydroxyl radicals have higher oxidation potential than chlorine and potassium permanganate so that expected able to oxidize organic-iron complexes. The aims of this research are to know the efficiency of iron removal by using H2O2-UV oxidation, reaction kinetics that happened, and to observe the influence of each factor and also interaction of each factor towards reaction oxidize iron through statistically tested. This research is conducted in batch with the variation of total iron concentration early: 3, 5, and 10 mg/l; dosage of Fe: H2O2 = 1:5, 1:8, and 1:10 (mole/mole); with treatment use UV 3x10 watt and without UV. The result of this research indicate that use of combining H2O2-UV 3x10 watt, with 1:5 dosage of Fe:H2O2, gave the maximum iron removal of 99% and the use of H2O2 with 1:8 dosage of Fe:H2O2, gave maximum iron removal 84%. If the total early iron concentration increases, the removal of iron concentration will decrease. But addition dosage of H2O2 will not improve efficiency. While UV ray give great influence to iron oxidation if being combined with H2O2. Oxidation of this iron show pseudo-first order reaction and its rate constant (k) increases if the oxidation uses H2O2-UV 3x10 watt. Oxidation process by H2O2-UV 3x10 watt will yield removal of Fe-R is 67% after application at Bandung area ground water.
Keywords: hydroxyl radicals; hydrogen peroxide; iron in ground water; reaction kinetics; ultraviolet ray.
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