Düşük SUVA Değerine Sahip Kaynak Sularında Farklı Dezenfeksiyon Senaryolarında Halonitrometan Oluşum Potansiyellerinin Değerlendirilmesi

Öz

Su dağıtım sistemlerinde tespit edilen tüm kanserojen dezenfeksiyon yan ürünleri arasında, halonitrometanlar diğerlerine nazaran en toksik sınıflardan biridir. Bu araştırmanın temel amacı, düşük SUVA'ya sahip içme suyu kaynaklarında halonitrometan oluşumunun sistematik araştırılmasıdır. Eğirdir Gölü'nde beş farklı dezenfeksiyon senaryolarında halonitrometan oluşum potansiyelleri testleri gerçekleştirilmiştir. Ozon + klor senaryosunun en yüksek halonitrometan oluşumuna sebep olduğu, müteakip ozon + kloramin/klorun oluşturduğu gözlenmiştir. Sadece Kloramin veya ozon senaryolarında, halonitrometan konsantrasyonu genellikle minimum tespit limitlerinin altında kalmıştır. Ozon + klor senaryosunda en yüksek halonitrometan konsantrasyonu 2.5 µg/L olarak belirlenmiştir. Ozon + klor senaryosunda tespit edilen en düşük halonitrometan konsantrasyonu ise 1.7 µg/L’dir. Ozon + klor senaryosunda halonitrometan konsantrasyonlarında ilkbahardan kışa doğru kayda değer bir düşüş tespit edilmiştir. Kloropikrin, ölçülebilir tek halonitrometan türü olmuştur. Halonitrometanlar ile su kalitesi parametreleri arasındaki analizlerde en yüksek korelasyon halonitrometanlar ile çözünmüş organik azot arasında bulunmuştur. Bununla birlikte, farklı doğal organik maddeler: inorganik maddeler veya dezenfektanlar da halonitrometan oluşumuna katkıda bulunmaktadır. Bu sonuçlar, düşük SUVA’ya sahip suların dezenfeksiyonunda azotlu dezenfeksiyon yan ürünlerinin (A-DYÜ) oluşumunu kontrol etmek için kullanılabilir.

Anahtar Kelimeler

• Oluşum Potansiyeli
• Halonitrometanlar
• Azotlu Dezenfeksiyon Yan Ürünleri

Assessment of Halonitromethanes Formation Potentials Under Different Disinfection Scenarios in Low SUVA Water

Öz

The main objective of this project is to investigate the formation of halonitromethanes, an emerging class of disinfection by-products (DBPs) identified in drinking waters in recent years, which are currently unregulated but highly toxic. Halonitromethanes formation potentials tests were investigated under five different disinfection conditions in Egirdir Lake with low specific ultraviolet absorbance (SUVA) value. The results showed that ozone/chlorine formed the highest halonitromethanes followed by in the order of ozone/chloramine and chlorine only. When chloramine or ozone were used alone, the halonitromethanes concentration was below the minimum detection limits. The highest halonitromethanes was determined 2.5 µg/L for ozone /chlorine scenario and the lowest halonitromethanes concentration was 1.7 µg/L in ozone /chlorine scenario. In the ozone/chlorine scenario, a dramatic decrease for halonitromethane formation was detected from spring to winter. Chloropicrin has been the only measurable halonitromethanes species. In the correlation analysis between halonitromethanes and water quality parameters, the highest correlation was found between halonitromethanes and dissolved organic nitrogen. Besides dissolved organic nitrogen, different organic/inorganic compounds and disinfectants also contribute to the formation of halonitromethanes. These results can be used to control the formation of N-DBPs in the disinfection of low SUVA waters.

Anahtar Kelimeler

• Formation Potentials
• Halonitromethanes
• Nitrogenous Disinfection by Products

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