Catalytic Ozonation of Natural Organic Matter via Nano Titanium Dioxide

Öz

Natural organic substances (NOM) in water, an important component of which is humic acids (HA), cause various problems in treatment plants as a result of the physical, chemical and biological changes they undergo. Since conventional treatment processes are insufficient for the removal of these compounds, it is aimed to be removed by advanced treatment processes. One of the most striking methods in recent years is catalytic ozonation processes (cOP). In this study, nano-sized TiO2 (nano-TiO2) was used as a catalyst in the oxidation of HA by ozonation. In the single ozonation, single adsorption and catalytic ozonation experiments performed to determine the contribution of the catalyst to the ozonation process, the change in organic matter concentration and fractions was followed by the dissolved organic carbon (DOC), UV254 and UV272 parameters. It is also known that UV indexes are an indicator of the formation potential of disinfection by-product form organic matter. As a result of the experiments, it was observed that the catalytic ozonation process achieved a performance above 95% and a DOC removal over 87% in degrading the aliphatic and aromatic structure of organic matter. It has been observed that single ozonation and single adsorption are limited in degrading the HA structure. Comparing pseudo-first order reaction kinetics nano-TiO2/O3 (0.4780 l/min) is almost three times faster than single ozonation (0.1773 l/min) and almost five times faster than single adsorption (0.1047 l/min) It has been observed to occur. It was concluded that catalytic ozonation processes are highly effective in NOM removal and nano-TiO2 catalyst is successful in generating free radicals.

Anahtar Kelimeler

• Natural Organic Matter
• Catalytic Ozonation
• Titanium dioxide
• Oxidation
• Aliphatic
• Aromatic

Nano Titanyum Dioksit Eşliğinde Doğal Organik Maddenin Katalitik Ozonlanması

Öz

Önemli bir bileşeni hümik asitler (HA) olan sulardaki doğal ornaik maddeler (DOM) uğradıkları fiziksel, kimyasal ve biyolojik değişimler sonucunda arıtma tesislerinde çeşitli problemlere sebep olmaktadırlar. Konvansiyonel arıtım prosesleri bu bileşiklerin giderimde yetersiz kaldıkları için ileri arıtım prosesleri ile giderimleri hedeflenmektedir. Son yıllarda en dikkat çekici yöntemlerden biri de katalitik ozonlama prosesleridir. Bu çalışmada HA’nın ozonlama ile oksidasyonunda katalizör olarak nano boyutlu TiO2 (nano-TiO2) kullanılmıştır. Katalizörün ozonlama prosesine katkısını belirlemek amacıyla gerçekleştirilen tekil ozonlama, tekil adsorpsiyon ve katalitik ozonlama deneylerinde organik madde konsantrasyonu ve fraksiyonlarındaki değişim çözünmüş organik karbon (ÇOK), UV254 ve UV272 parametreleri üzerinden takip edilmiştir. UV indekslerinin organik maddenin dezenfeksiyon yan ürünü oluşturma potansiyelinin bir göstergesi olduğu da bilinmektedir. Deneyler sonucunda, organik madde alifatik ve aromatik yapısını bozundurmada katalitik ozonlama prosesinin %95 üzerinde bir başarım ve %87 üzerinde ÇOK giderimi sağladığı görülmüştür. Tekil ozonlamanın ve tekil adsorpsiyonun ise HA yapısını bozundurmada kısıtlı kaldığı görülmüştür. Yalancı 1. Derece reaksiyon kinetikleri kıyaslandığında nano-TiO2/O3 (0,4780 1/dk), tekil ozonlamadan (0,1773 1/dk) neredeyse üç kat, tekil adsorpsiyondan (0,1047 1/dk) neredeyse beş kat daha hızlı gerçekleştiği görülmüştür. Katalitik ozonlama proseslerinin doğal organik madde gideriminde oldukça etkin olduğu ve nano-TiO2 katalizörünün serbest radikal oluşturmada başarılı olduğu sonucuna varılmıştır.

Anahtar Kelimeler

• Doğal organik madde
• Katalitik ozonlanma
• Titanyum dioksit
• Oksidasyon
• Alifatik
• Aromatik

Kaynakça

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