Effect of Sulfate Radicals Produced by UV-C Activation on Bacterial Inactivation

Abstract

Water crises, which may be one of the biggest global risks of the future, will bring along difficulties in accessing quality drinking water. Microorganism disinfection is one of the most important points in supplying quality drinking water. Advanced oxidation processes have been started to be applied as an alternative in drinking water disinfection recently. Sulfate radicals, which are highly reactive and selective among advanced oxidation methods, are increasingly come into prominance. In this study, the effect of sulfate radicals activated by UV-C on the removal of E.coli isolated from sewage was investigated. Four different concentrations of K2S2O8 (0.5, 1, 2 and 3 mmol/L) were used UV-C+K2S2O8 process. It was determined that E.coli inactivation increased with the increasing the concentration of K2S2O8 activated by UV-C. Addition of 2 mmol/L K2S2O8 to the during UV-C process, an increase of approximately 2.7 log on bacteria removal was obtained within 30 seconds. The time required for 5.48 log E.coli inactivation was determined 60 and 30 seconds when 1 and 2 mmol/L K2S2O8 was used, respectively. This time decreased to 8 seconds when the K2S2O8 concentration increased to 3 mmol/L. This reduction in time will significantly reduce the electricity cost of the advanced oxidation process.

Keywords

• Sulfate radicals
• UV-C radiation
• E.coli
• Inactivation

UV-C AKTİVASYONU İLE ÜRETİLMİŞ SÜLFAT RADİKALLERİNİN BAKTERİ İNAKTİVASYONUNA ETKİSİ

Abstract

Geleceğin en büyük küresel risklerinden biri olabilecek su krizleri, kaliteli içme suyuna ulaşabilmede sıkıntıların yaşanmasını da beraberinde getirecektir. İçilebilir nitelikte kaliteli içme suyu temininde en önemli noktalardan biri mikroorganizma dezenfeksiyonudur. Son zamanlarda içme suyu dezenfeksiyonunda ileri oksidasyon prosesleri alternatif olarak uygulanmaya başlanmıştır. İleri oksidasyon yöntemleri içinde son derece reaktif ve seçici olan sülfat radikalleri, giderek ön plana çıkmaktadır. Bu çalışmada, kanalizasyon suyundan izole edilmiş E.coli bakterisinin dezenfeksiyonunda, UV-C ile aktif hale getirilmiş sülfat radikallerinin giderim verimine etkisi incelenmiştir. Sülfat radikali bazlı fotokimyasal ileri oksidasyon prosesinde (UV-C+K2S2O8) dört farklı konsantrasyonda K2S2O8 (0,5, 1, 2 ve 3 mmol/L) kullanılmıştır. UV-C radyasyonu ile aktifleştirilen K2S2O8’in konsantrasyonunun artması ile E.coli inaktivasyonunun arttığı belirlenmiştir. UV-C prosesine, 2 mmol/L K2S2O8 ilave edilmesi ile 30 saniye içinde yaklaşık 2,7 logluk bir bakteri giderim artışı elde edilmiştir. 5,48 log E.coli inaktivasyonu sağlanması için gerekli süre, 1 mmol/L K2S2O8 kullanıldığı durumda 60 saniyede iken, 2 mmol/L K2S2O8 kullanıldığında 30 saniye olarak tespit edilmiştir. K2S2O8 konsantrasyonu 3 mmol/L’ ye çıktığında bu süre 8 saniyeye düşmüştür. Süredeki bu azalma ileri oksidasyon prosesinin elektrik maliyetini önemli ölçüde azaltacaktır.

Keywords

• Sülfat radikalleri
• UV-C radyasyonu
• E.coli
• İnaktivasyon

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