Full Description

The inactivation of indigenous microorganisms (total and fecal coliform bacteria, and totalaerobic spores) and spiked surrogate, respiratory, and enteric viruses (MS-2 bacteriophage,adenovirus type 4, reovirus type 3, and coxsackievirus type B5) by wastewater treatmenttechnologies was evaluated on the bench-scale. These include: low- and medium-pressure (LPand MP) UV, LPUV/Hsub2/subOsub2/sub, ozonation, Osub3/sub/Hsub2/subOsub2/sub, peracetic acid (PAA), LPUV/PAA, chlorination,chloramination, and ultrafiltration. The applicability of the candidate disinfection methods,especially emerging and comparatively untested methods such as PAA and advanced oxidationprocesses (AOPs), was studied through comparison of their performance and the important watermatrix parameters (e.g., alkalinity, BOD, TSS, etc.).Of the chemical disinfectants, molecular ozone and free chlorine were the most effective, withsubstantial coliform and virus kill at low doses. Combined chlorine in the form ofmonochloramine had a reduced disinfectant capacity than free chlorine, and peracetic acid (PAA)performed equally as well as free chlorine with respect to coliform bacteria in some instances buthad little to no impact on spiked MS2 bacteriophage. None of the aforementioned disinfectantshad an appreciable impact on indigenous aerobic spore-forming bacteria due to their physiology.UV and Osub3/sub rapidly killed human enteric and respiratory viruses, but a consistent benefit by AOPsover their base technologies was not observed for any of their base technologies. Low andmedium-pressure UV inactivated free-floating indigenous coliform bacteria almost immediately,while slower inactivation rates at higher UV fluences illustrated the "tailing" behavior observedwhen bacteria are embedded in or shielded by particulate matter. Log-linear inactivation of spikedviruses and indigenous aerobic spores by UV was consistent across the utility waters. Includes 10 references, tables, figures.

Product Details

Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 12File Size: 1 file , 1 MB