Biological Reduction of Acid Red 14 by Elemental Sulfur and Methanol-Based Reactors

In this study for the first time, biological reduction of the Acid Red 14 in elemental sulfur-based anaerobic reactor was studied. Two up-flow packed bed reactors were investigated in parallel for 95 days. Sulfur and methanol were used as electron donors in these reactors and the performance of the sulfur-based reduction process was investigated in comparison with a conventional electron source - methanol. The reactors were operated in 7 different periods, the influent dye concentration was kept at 5 - 10 mg/L and HRT was set to 12-24 hours. While influent Acid Red 14 concentration was 10 ± 0.14 mg/L, it was reduced to 1.3±0.2 in the methanol-based reactor and 2.05±0.2 in the sulfur-based reactor. Elemental sulfur was used for the first time in and the effect of sulfur oxidation in dye reduction process on sulfate and alkalinity production was also investigated.

Asit Kýrmýzý 14 Boyasýnýn Elementel Kükürt ve Metanol Bazlý Reaktörlerde Biyolojik Ýndirgenmesi

Bu çalýþmada ilk kez elementel kükürt bazlý anaerobik reaktörde Asit Kýrmýzý 14'ün biyolojik olarak indirgenmesi Bu reaktörlerde elektron kaynaðý olarak kükürt ve metanol kullanýlmýþ ve kükürt bazlý indirgeme iþleminin performansý geleneksel bir elektron kaynaðý olan metanol ile karþýlaþtýrmalý olarak incelenmiþtir. Reaktörler 7 farklý periyott çalýþýlmýþ olup, giriþ boya konsantrasyonu 5-10 mg/L’de ve HRT 12-24 saat olarak ayarlanmýþtýr. Asit Kýrmýzý 14 konsantrasyonu giriþte 10±0.14 mg/L iken, metanol bazlý reaktörde 1.3±0.2 mg/L'ye, kükürt esaslý reaktörde ise 2.05±0.2 mg/L’ye düþmüþtür. Kükürt bu çalýþma ile boya indirgeme sürecinde ilk kez kullanýlmýþ ve bu süreçte kükürt oksidasyonunun sülfat ve alkalinite üretimine etkisi ayrýca araþtýrýlmýþtýr.