期刊
WATER ENVIRONMENT RESEARCH
卷 78, 期 6, 页码 565-571出版社
WATER ENVIRONMENT FEDERATION
DOI: 10.2175/106143006X99795
关键词
UV; chlorine; inactivation; particle association; Contaminant Candidate List
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-mu m 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/cm(2) at 254 nm) and free chlorine (27 to 150 mg-min/L at 4 degrees C). Inactivation of M. terrae in wastewater was initially rapid, with 2.5 log reduction at 14 mJ/cm(2) and 56 mg-min/L for UV and free chlorine, respectively. However, in effluent and 1000-mu m filtered wastewater, spiked M. terrae was present to the highest doses evaluated. Interestingly, M. terrae passed through 41- and 20-mu m 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.
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