Influence of organic carbon loading, sediment associated metal oxide content and sediment grain size distributions upon Cryptosporidium parvum removal during riverbank filtration operations, Sonoma County, CA

摘要: Abstract This study assessed the efficacy for removing Cryptosporidium parvum oocysts of poorly sorted, Fe- and Al-rich, subsurface sediments collected from 0.9 to 4.9 1.7–13.9 m below land surface at an operating riverbank filtration (RBF) site (Russian River, Sonoma County, CA). Both formaldehyde-killed oocyst-sized (3 μm) microspheres were employed in sediment-packed flow-through static columns. The degree coverage metal oxides on sediment grain surfaces correlated strongly with degrees oocyst microsphere removals. In contrast, average size ( D 50 ) was not a good indicator either or removal, suggesting that primary mechanism immobilization within these is sorptive rather than physical straining. A low specific UV absorbance (SUVA) organic matter isolated Russian suggested modest concentration SUVA component (0.8 mg L −1 2.2 mg L dissolved carbon (DOC) relatively unreactive. Nevertheless, amendment river DOC column resulted up 35.7% decrease sorption (or) microspheres. Amendments (3.2 μM) anionic surfactant, sodium dodecyl benzene sulfonate (SDBS) also caused substantive decreases (up 31.9 times) colloid filtration. Although grain-surface found have high colloid-removal capacity, our any major changes watershed would result long-term alterations quantity character river's could alter effectiveness pathogen removal during RBF operations.