Inactivation of indicator bacteria in treated municipal wastewater and biosolids by gamma irradiation

Abstract

Increasing growth of the world’s population, waste minimization policies and agricultural needs make the recycling of domestic wastewater quite a desirable practice. Factors like environmental and public health risks must be taken into account when considering treated wastewater for field irrigation and biosolids for land application. Wastewater disinfection is achieved via chlorination or UV-irradiation. In this study, an alternative disinfectant, gamma radiation is investigated. It is found that 60Co-gamma irradiation could be effectively used for the disinfection of effluents from the municipal wastewater treatment plants, and gamma radiation dose of at least 5000 Gy was required for the inactivation Enterococcus sp., the most resistant bacteria among the indicator bacteria tested

Keywords

• Disinfection
• gamma irradiation
• indicator bacteria
• municipal wastewater

Belediye arıtılmış atıksu ve biyokatılarında bulunan indikatör bakterilerin gama ışınlama ileinaktivasyonu

Abstract

Dünya nüfusundaki artış, atıkların azaltılması politikası ve tarımsal gereksinimler evsel nitelikli atıksuların arıtılarak tekrar kullanımını istenen bir uygulama haline getirmiştir. Arıtılmış atıksuların tarım arazilerinin sulanmasında ve biyokatıların gübre olarak kullanımında ortaya çıkabilecek çevre ve halk sağlığına ilişkin risk faktörleri dikkate alınmalıdır. Atıksuların dezenfeksiyonu klorlama veya ultraviyole ışınlama ile sağlanmaktadır. Bu çalışmada gama ışınlama alternatif bir dezenfektan olarak araştırılmıştır. Sonuç olarak 60Co-gama ışınlamanın belediye arıtılmış atıksularının dezenfeksiyonunda etkili olduğu ve incelenen indikatör bakteriler içinde en dirençli olan Enterokok türleri dikkate alındığında en az 5000 Gy radyasyon dozunun uygulanması gerektiği belirlenmiştir

Keywords

• Belediye atıksuyu
• dezenfeksiyon
• gama ışınlama
• indikatör bakteri

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