Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ultraviolet and Chlorine Disinfection of Mycobacterium in Wastewater: Effect of Aggregation
Mycobacteria naturally aggregate in water, a characteristic that may serve to protect them against disinfection in wastewater. Secondary effluent was spiked with Mycobacterium terrae (M. terrae), sequentially filtered through 100‐, 41‐, and 20‐μm nylon filters to partition aggregate sizes, confirmed using particle‐size analysis and microscopy. Each sample was exposed to doses of UV light (10 to 60 mJ/cm2 at 254 nm) and free chlorine (27 to 150 mg‐min/L at 4°C). Inactivation of M. terrae in wastewater was initially rapid, with 2.5 log reduction at 14 mJ/cm2 and 56 mg‐min/L for UV and free chlorine, respectively. However, in effluent and 100‐μm filtered wastewater, spiked M. terrae was present to the highest doses evaluated. Interestingly, M. terrae passed through 41‐ and 20‐μm filters were inactivated rapidly, with no survivors after moderate disinfection doses. Inactivation of Mycobacteria in wastewater may be compromised by aggregates larger than 41 microns.
Ultraviolet and Chlorine Disinfection of Mycobacterium in Wastewater: Effect of Aggregation
Mycobacteria naturally aggregate in water, a characteristic that may serve to protect them against disinfection in wastewater. Secondary effluent was spiked with Mycobacterium terrae (M. terrae), sequentially filtered through 100‐, 41‐, and 20‐μm nylon filters to partition aggregate sizes, confirmed using particle‐size analysis and microscopy. Each sample was exposed to doses of UV light (10 to 60 mJ/cm2 at 254 nm) and free chlorine (27 to 150 mg‐min/L at 4°C). Inactivation of M. terrae in wastewater was initially rapid, with 2.5 log reduction at 14 mJ/cm2 and 56 mg‐min/L for UV and free chlorine, respectively. However, in effluent and 100‐μm filtered wastewater, spiked M. terrae was present to the highest doses evaluated. Interestingly, M. terrae passed through 41‐ and 20‐μm filters were inactivated rapidly, with no survivors after moderate disinfection doses. Inactivation of Mycobacteria in wastewater may be compromised by aggregates larger than 41 microns.
Ultraviolet and Chlorine Disinfection of Mycobacterium in Wastewater: Effect of Aggregation
Bohrerova, Zuzana (Autor:in) / Linden, Karl G. (Autor:in)
Water Environment Research ; 78 ; 565-571
01.06.2006
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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